JP2002220198A - Second expansion boom actuation range regulating device for vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a second expansion boom actuation range regulating device 17 regulating an actuation range of a second expansion boom 5, and to reduce torsional moment and the like acting from the second expansion boom 5 side to a first expansion boom 3, in a vehicle for high lift work wherein the second expansion boom 5 is attached to a tip end of the first expansion boom so as to horizontally swivel. SOLUTION: This second expansion boom actuation range regulating device 17 is composed of a second expansion boom swiveling position detector 18, a second expansion boom length detector 19, and an actuation regulating signal output portion 20 receiving detected signals from the detectors 18, 19 and outputting an actuation regulating signal to control portions 11a, 10a of a expansion driving device 11 and a swiveling driving device 20 in the second expansion boom 5. The second expansion boom actuation range regulating device 17 sets permissible actuation range wherein permissible actuation length L2 of a second expansion boom when the second expansion boom 5 swivels in a direction orthogonal to a rising/falling track surface of the first expansion boom 3 is set to be shorter than permissible actuation length L1 of a second expansion boom when the second expansion boom 5 swivels in a direction along the rising/falling track surface of the first expansion boom 3. The second expansion boom 5 is regulated not to exceed the permissible actuation range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle, a swivel mounted on the vehicle so as to be capable of swinging drive, a first telescopic boom mounted on the swivel so as to be able to move up and down, and a first telescopic boom provided at a tip end thereof. A posture maintaining member attached so as to maintain a constant ground position regardless of the up-and-down movement of the telescopic boom, a second telescopic boom whose base end is attached to the posture maintaining member so as to be capable of horizontal turning drive, and The present invention relates to a second telescopic boom operating range restricting device used for an aerial work vehicle, comprising: a work table attached to a tip end of a telescopic boom.

[0002]

2. Description of the Related Art An aerial work vehicle to which a second telescopic boom operating range restricting device according to the present invention is attached is a vehicle which stably supports the vehicle, and drives a swivel base to rotate, a first telescopic boom to move up and down, and telescopic drive. Since the spatial position of the distal end of the second telescopic boom (the spatial position of the worktable) can be selected in a wide range by using both the rotation and the telescopic drive of the second telescopic boom, various high-altitude operations can be performed.

[0003] This type of aerial work vehicle is provided with a first telescopic boom operating range restricting device, and the first telescopic boom operating range restricting device ensures the safety of working at a high place. I have.

[0004] The first telescopic boom operating range restricting device includes:
Under a state where the second telescopic boom is turned and extended so that the bending force from the second telescopic boom side that attempts to bend the first telescopic boom along the undulating locus plane is maximized, The driving of the first telescopic boom, which exceeds the allowable operating range of the first telescopic boom set within a range in which the first telescopic boom does not fall over or bend by the bending force along the undulating trajectory surface, is restricted.

[0005] The aerial work vehicle provided with the first telescopic boom operating range restricting device has an advantage that the operation (turning operation and telescopic operation) of the second telescopic boom is not regulated at all, so that it is easy to use. .

[0006]

However, the fact that the operation of the second telescopic boom (turning and telescopic operation) is not restricted at all means that the most extended second telescopic boom is orthogonal to the undulation locus plane of the first telescopic boom. It means that it can be turned in the direction. In such a state of the second telescopic boom, the lateral bending force of the posture maintaining member based on the force acting from the second telescopic boom side (the bending force of the first telescopic boom in the direction orthogonal to the undulation trajectory plane, hereinafter the same) .) Is the largest. Further, in such a state of the second telescopic boom, the lateral bending force and the torsional force of the first telescopic boom based on the force acting from the second telescopic boom side are the largest. For this reason, the posture maintaining member and the first telescopic boom, the lateral bending strength (strength with respect to the lateral bending force) and the torsional strength of the first telescopic boom, the second telescopic boom that has been extended most, the undulation of the first telescopic boom. It was not manufactured to withstand a lateral bending force and a torsional force when it was turned in a direction perpendicular to the track surface, and the weight and the manufacturing cost of the posture maintaining member and the first telescopic boom increased accordingly.

[0007] The present invention has been made in view of the above-mentioned problems of the prior art, and includes a lateral bending force acting on the posture maintaining member and the first telescopic boom from the second telescopic boom side, and a lateral bending force from the second telescopic boom side. It is an object of the present invention to provide a second telescopic boom operating range restricting device capable of reducing the torsional force acting on the first telescopic boom, thereby reducing the weight and the manufacturing cost of the posture maintaining member and the first telescopic boom. .

[0008]

In order to solve the above-mentioned problems, a second telescopic boom operating range regulating device for an aerial work vehicle according to a first aspect of the present invention is configured as follows. vehicle,
A swivel that is swingably mounted on the vehicle, a first telescopic boom that is mounted on the swivel so that it can be driven up and down, and a fixed ground position at the tip of the first telescopic boom regardless of the up and down movement of the first telescopic boom. A posture maintaining member attached to maintain the posture, a second telescopic boom having a base end mounted on the posture maintaining member so as to be capable of horizontal turning drive, and a work table mounted to a distal end of the second telescopic boom. And, in a state where the second telescopic boom is swiveled and extended so that the bending force from the second telescopic boom side, which attempts to bend the first telescopic boom along the undulation locus plane, is maximized, The second telescopic boom is controlled so that the first telescopic boom exceeds an allowable operating range of the first telescopic boom set within a range where the work vehicle does not fall down or the first telescopic boom is not damaged by the bending force along the undulating trajectory surface. A second telescoping boom operation range restricting device for use in aerial platforms consisting comprises a telescopic boom operation range restricting device, turning position of the second telescopic boom (angle)
Telescopic boom turning position detector for detecting the length of the second telescopic boom, a second telescopic boom length detector for detecting the length of the second telescopic boom, and a telescopic drive device for the second telescopic boom that receives detection signals from these detectors And an operation restriction signal output unit that outputs an operation restriction signal to each control unit of the turning drive device, wherein the operation restriction signal output unit is within the allowable operation range of the tip of the second telescopic boom, When the second telescopic boom turns in a direction perpendicular to the undulation trajectory surface of the first telescopic boom with respect to the allowable length of the second telescopic boom when turning in the direction along the trajectory trajectory surface of the first telescopic boom. The operation allowable range in which the second telescopic boom operation allowable length of the second telescopic boom is set short is stored, and the actual length of the second telescopic boom tip part obtained from the length and the turning position of the second telescopic boom received from each of the detectors is stored. If the position is When trying to deviate from the operation permissible range according to the memory, a restriction signal for restricting the extension movement and the turning movement of the second telescopic boom in a direction that promotes the departure is controlled by the control of the telescopic drive device and the turning drive device. A second telescopic boom operating range restricting device at a high place, wherein the device is configured to output to a section.

The second telescopic boom operating range restricting device according to the first aspect of the present invention is configured to control the operation of the second telescopic boom (turning drive and extension driving) by causing the second telescopic boom to move up and down the first telescopic boom. The second telescopic boom operation allowable length when the second telescopic boom is turned in a direction perpendicular to the undulation trajectory surface of the first telescopic boom with respect to the second telescopic boom operation allowable length when the second telescopic boom is turned in a direction along the surface. Automatically regulates to a shorter allowable operating range. As a result, the lateral bending force acting on the posture maintaining member and the first telescopic boom from the second telescopic boom side, and the torsional force acting on the first telescopic boom via the posture maintaining member from the second telescopic boom side are the same as those of the conventional art. Therefore, the weight and cost of the first telescopic boom and the posture maintaining member can be reduced as compared with the conventional one.

According to a second aspect of the present invention, an aerial work vehicle to which the second telescopic boom operating range restricting device of the aerial work vehicle according to the first aspect is attached, has its posture maintaining member mounted in the upper post section. A telescopic post that is telescopically driven by sequentially inserting a lower post section in a telescopic manner,
The uppermost post section is constituted by a telescopic post attached to the tip of the first telescopic boom such that the telescopic axis is vertical, and the second telescopic boom is the lower end of the lowermost post section of the telescopic post. This is specified to those which are mounted so as to be capable of horizontal turning drive. Such an aerial work vehicle is known as a so-called aerial work vehicle for bridge inspection.

The second telescopic boom operating range restricting device of the aerial work vehicle according to the second aspect has the same function as that of the first telescopic boom, but in particular, the posture constituted by the telescopic post. Since the weight of the maintenance member and the cost increase when securing the lateral bending strength (strength against the lateral bending force) are remarkable, the posture maintaining member by the second telescopic boom operation range restricting device for the aerial work vehicle according to the present invention. The effect of reducing the weight and cost is great.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the second telescopic boom operating range restricting device for an aerial work vehicle according to the present invention will be described below with reference to the drawings. First, an aerial work vehicle to which the second telescopic boom operating range restricting device of the present invention is attached will be described with reference to FIGS.

FIG. 1 shows an aerial work vehicle. In FIG.
Reference numeral 1 denotes a vehicle, 2 denotes a swivel mounted on the vehicle 1 so as to be freely rotatable, 3 denotes a first telescopic boom mounted to the swivel 2 so as to be able to move up and down, and 4 denotes a tip of the first telescopic boom 3. A second telescopic boom, which is attached to the attitude maintaining member 4 so as to be able to be driven to rotate horizontally, is a second telescopic boom. 2 is a work table attached to the tip of the telescopic boom 5. Outriggers 1a are attached to the vehicle 1 to stably support the vehicle 1 at the time of working at heights by a working vehicle at height.

The turning drive of the turntable 2, the raising / lowering drive of the first telescopic boom 3, the telescopic drive of the first telescopic boom 3, the turning drive of the second telescopic boom 5, and the telescopic drive of the second telescopic boom 5, respectively, The operation is performed by the swivel platform turning drive device 7, the first telescopic boom up / down driving device 8, the first telescopic boom telescopic driving device 9, the second telescopic boom turning drive device 10, and the second telescopic boom telescopic driving device 11. I have.

FIG. 2 shows an example of a first telescopic boom operating range restricting device provided in the aerial work vehicle of FIG. In FIG. 2, the first telescopic boom operation restricting device 12
Is a turntable turning position detector 13 for detecting the turning position (angle) of the turning table 6, a first telescopic boom hoisting angle detector 14 for detecting the undulating angle of the first telescopic boom 3, and a length of the first telescopic boom 3. Telescopic boom length detector 15 for detecting the length, and a first telescopic boom operation restriction signal for receiving and calculating detection signals from these detectors 13 to 15 and outputting a first telescopic boom operation restriction signal to be described later The output unit 16 is provided.

The first telescopic boom operation restriction signal output unit 1
6 shows a state where the second telescopic boom is swiveled and extended so that the bending force from the second telescopic boom side, which attempts to bend the first telescopic boom along the undulation locus plane, is maximized. The operating range of the first telescopic boom, which is set within a range where the work vehicle does not fall down or the first telescopic boom is not damaged by the bending force along the undulating trajectory surface, is determined by the turning position (angle) of the turntable 2 and the first telescopic boom 3 Of the first telescopic boom 3 as a function of the undulation angle and the length of the first telescopic boom 3.

The first telescopic boom operation restriction signal output unit 16 outputs the turning position (angle) of the turntable 2 and the undulation of the first telescopic boom 3 which are grasped from the detection signals from the detectors 13 to 15. When the angle and the length of the first telescopic boom 3 attempt to deviate from the first telescopic boom operation allowable range according to the memory, the turning drive of the turntable 2 in the deviating direction;
The drive control unit 7a of the swivel-swing drive 7 and the drive of the first telescopic boom up / down drive 8 are controlled by an operation control signal for restricting the first telescopic boom 3 to fall and the first telescopic boom to extend. The control section 8a and the drive control section 9a of the first telescopic boom telescopic drive device 9 are each output.

The drive control units 7a to 9a include:
An operation unit (not shown) for instructing driving of the corresponding driving devices 7 to 9 by an operator's operation is provided, and these operation units are always operated (when the operation restriction signal is not input). Thus, the corresponding driving devices 7 to 9 can be driven in any direction. Then, when the operation control signal is input to each of the drive control units 7a to 9a, the above-described drive is controlled by intervening in the operation of the corresponding operation unit (forcibly stopped or disabled). Has become.

The first telescopic boom operating range restricting device 12 configured as described above is designed to maximize the bending force from the second telescopic boom side, which attempts to bend the first telescopic boom along the undulation locus plane. (2) With the telescopic boom swiveled and extended, set the allowable range of the first telescopic boom operation within the range where the aerial work vehicle does not fall over or the first telescopic boom is not damaged by the bending force along the undulating trajectory surface. Since the drive of the first telescopic boom is automatically restricted so as not to exceed, the safety of work at a high place is ensured by the first telescopic boom operating range restricting device.

However, the aerial work vehicle equipped with such a first telescopic boom operation allowable range restricting device 12 has a lateral bending strength (strength against a lateral bending force) of the posture maintaining member 4 and the first telescopic boom 5, and The torsion strength of the first telescopic boom 5 is made to withstand the transverse bending force and the torsional force when the most extended second telescopic boom 5 is turned in the direction orthogonal to the undulation trajectory plane of the first telescopic boom 3. However, the weight and manufacturing cost of the posture maintaining member and the first telescopic boom have increased accordingly. This is as described above in the section of “Problems to be Solved by the Invention”.

Next, the second telescopic boom operating range restricting device of the present invention, which is mounted on the aerial work vehicle, will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 shows a second telescopic boom operating range restricting device 17 according to the present invention. FIG.
Indicates the allowable operation range of the second telescopic boom 5 by the second telescopic boom operation range restricting device 17 shown in FIG. FIG. 4 shows the first telescopic boom 3 of the aerial work vehicle shown in FIG.
The second telescopic boom operation allowable range by the second telescopic boom operation range restricting device 17 is drawn on a plan view of the distal end portion, the posture maintaining member 4, the second telescopic boom 5, and the worktable 6.

In FIG. 3, a second telescopic boom operating range restricting device 17 includes a second telescopic boom turning position detector 18 for detecting a turning position (angle) of the second telescopic boom 5 and a length of the second telescopic boom 5. Telescopic boom length detector 1 for detecting
9 and the control units 10a, 1a of the second telescopic boom swing drive device 10 and the second telescopic boom telescopic drive device 11 which receive the detection signals from the detectors 18 and 19, respectively.
An operation regulation signal output unit 20 that outputs an operation regulation signal to 1a
It is composed of

The operation restricting signal output section 20 is within the allowable operating range of the distal end of the second telescopic boom 5 when the second telescopic boom 5 turns in the direction along the undulation trajectory surface of the first telescopic boom 3. Second telescopic boom operation allowable length L1 (see FIG. 4)
On the other hand, when the second telescopic boom is turned in a direction perpendicular to the up-and-down locus plane of the first telescopic boom, the second telescopic boom operation allowable length L2 (see FIG. 4) is set to a shorter allowable operation range S.
The actual position of the tip of the second telescopic boom 5 obtained from the length and the turning position of the second telescopic boom 5 received from each of the detectors 18 and 19 corresponds to the operation allowable range S ( When the vehicle tries to deviate from the vehicle (see FIG. 4), the control signal of the second telescopic boom telescopic drive device 11 is transmitted to a restriction signal for restricting the extension and turning movements of the second telescopic boom 5 in a direction to promote the departure. 11a and to the drive control unit 10a of the second telescopic boom turning drive device 10.

Each of the drive control units 11a and 10a is provided with a corresponding drive device 11 or 1 by an operator's operation.
There is provided an operation unit (not shown) for instructing the drive of 0, and the operation unit always operates by operating these operation units (when the operation restriction signal is not input from the operation restriction signal output unit 20). The driving devices 11 and 10 can be driven in arbitrary directions. Then, each drive control unit 11
When the operation restriction signal is input from the operation restriction signal output unit 20 to a to 10a, the above-described driving is restricted (forcibly stopped or disabled) by intervening in the operation of the corresponding operation unit. It has become.

The second telescopic boom operating range regulating device 17 of the aerial work vehicle according to the present invention configured as described above controls the operation of the second telescopic boom 5 (turning drive and extension driving), and the second telescopic boom 5 The second telescopic boom 5 moves in a direction perpendicular to the undulating trajectory surface of the first telescopic boom 3 with respect to the second telescopic boom operation allowable length L1 when the telescopic boom is turned in a direction along the undulating trajectory surface of the first telescopic boom 3. The second telescopic boom operation allowable length L2 at the time of turning is automatically restricted to a short set operation allowable range. As a result, the lateral bending force acting on the posture maintaining member 4 from the second telescopic boom 5 side and the torsional force acting on the first telescopic boom 3 from the second telescopic boom 5 via the posture maintaining member 4 are the same as those of the conventional art. Can be reduced compared to
As a result, the weight and cost of the first telescopic boom 3 and the posture maintaining member 4 can be reduced as compared with the conventional one.

In the aerial work vehicle shown in FIG. 1, a posture maintaining member 4 is provided upright at the distal end of the first telescopic boom 3 (regardless of the up-and-down movement of the first telescopic boom 3). The base position of the second telescopic boom 5 is attached to this posture maintaining member 4 so that the second telescopic boom 5 can be turned horizontally above the first telescopic boom 3. However, the second telescopic boom operating range restricting device of the aerial work vehicle according to the present invention includes:
Such an aerial work vehicle shown in FIG. 1 is not limited to the mounting target.

FIG. 5 shows another aerial work vehicle to which the second telescopic boom operating range restricting device of the present invention is attached. The aerial work vehicle shown in FIG.
Has the same basic configuration as that of the aerial work vehicle, but the posture maintaining member 4 includes upper post sections 21 and 2.
2 is a telescopically drivable telescopic post in which lower post sections 22, 23 are sequentially telescopically inserted into the telescopic post 2.
The telescopic post (posture maintaining member 4) is formed by attaching the uppermost post section 21 to the distal end of the first telescopic boom 3 so that the telescopic axis P is vertical.
The second telescopic boom 5 is telescopic post (posture maintaining member 4)
5 is different from the aerial work vehicle shown in FIG. Such an aerial work vehicle is frequently used as a so-called bridge inspection vehicle (an aerial work vehicle for bridge inspection).

The second telescopic boom operating range restricting device 17 for an aerial work vehicle according to the present invention is applied to such an aerial work vehicle (bridge inspection vehicle) with the configuration as shown in FIG.
The operation and effect as described in the above-described embodiment can be achieved.
Aerial work vehicles (bridge inspection vehicles) with
Weight and cost when securing the lateral bending strength (strength of the first telescopic boom against bending in the direction orthogonal to the undulation trajectory plane) of the second telescopic boom of the aerial work vehicle according to the present invention. The effect of reducing the weight and cost of the posture maintaining member by the operation range restricting device is particularly large.

FIG. 6 is an explanatory view of the allowable operating range S of the second telescopic boom 5 of the aerial work vehicle (bridge inspection vehicle) shown in FIG. ) Of the first telescopic boom 3, the posture maintaining member 4 (telescopic post), the second telescopic boom 5, and the worktable 6 in a plan view. The boom operation allowable range S is drawn.

In FIG. 6, the mechanically rotatable area of the second telescopic boom 5 of the aerial work vehicle (bridge inspection vehicle) is such that the top end of the second telescopic boom 5 is connected to the first telescopic boom 3 in plan view. Between a turning position along the undulation trajectory surface of the first telescopic boom toward the base end side and a turning position at one side of the undulation trajectory surface of the first telescopic boom 3 perpendicular to the undulation trajectory surface. It is set between. Such a setting of the turning area is caused by the fact that this kind of aerial work vehicle (bridge inspection vehicle) is used by pointing the work title to the lower side of the bridge, bypassing the railing of the bridge.

Also in this example, the second telescopic boom operation allowable range S is the second telescopic boom operation allowable length L1 when the second telescopic boom 5 turns in the direction along the undulation trajectory surface of the first telescopic boom 3. On the other hand, the second telescopic boom operation allowable length L2 when the second telescopic boom is turned in a direction perpendicular to the undulation trajectory surface of the first telescopic boom is set short (operation restriction by the second telescopic boom operation range restriction device 17). When the second telescopic boom 5 attempts to deviate from the operation allowable range S, the turning drive and the extension drive of the second telescopic boom 5 in the departure direction are automatically performed. It is regulated.

[0032]

As described above, the second telescopic boom operating range restricting device of the aerial work vehicle according to the present invention configured as described above controls the operation (turning drive and extension driving) of the second telescopic boom 5 by using the second telescopic boom 5. Is the direction in which the second telescopic boom 5 is orthogonal to the undulating trajectory surface of the first telescopic boom 3 with respect to the second telescopic boom operation allowable length L1 when the wing turns in the direction along the undulating trajectory surface of the first telescopic boom 3. The second allowable length B2 of the telescopic boom when turning is automatically restricted to a shortly set allowable operation range. As a result, the posture maintaining member 4 is moved from the second telescopic boom 5 side.
And the torsional force acting on the first telescopic boom 3 from the second telescopic boom 5 side via the posture maintaining member 4 can be reduced as compared with the conventional one. The weight and cost of the telescopic boom 3 and the posture maintaining member 4 can be reduced as compared with the conventional one.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an aerial work vehicle to be mounted according to the present invention.

FIG. 2 is an explanatory view of a first telescopic boom operation restricting device provided in the aerial work vehicle shown in FIG. 1;

FIG. 3 is an explanatory view of a second telescopic boom operation restricting device according to the present invention.

FIG. 4 is an explanatory diagram of an allowable operation range of the second telescopic boom of the aerial work vehicle of FIG. 1 by the second telescopic boom operation restricting device of the present invention.

FIG. 5 is an explanatory view of another example of an aerial work vehicle to be attached according to the present invention.

FIG. 6 is an explanatory diagram of an allowable operating range of the second telescopic boom of the aerial work vehicle of FIG. 5 by the second telescopic boom operation restricting device of the present invention.

【Definition of terms】

1; vehicle, 1a ...; outrigger, 2; swivel base, 3; first telescopic boom, 4; posture maintaining member, 5; second telescopic boom,
6; work table, 7; swivel table swing drive device, 7a; drive control unit, 8; first telescopic boom up / down drive device, 8a; drive control unit, 9; first telescopic boom telescopic drive device, 9a; drive control unit , 10; second telescopic boom turning drive, 10a; drive control unit, 11; second telescopic boom telescopic drive, 11a;
Drive control unit, 12; first telescopic boom operating range regulating device,
13; swivel table turning position detector; 14; first telescopic boom undulation angle detector; 15; first telescopic boom length detector; 16;
First telescopic boom operation restriction signal output unit, 17; second telescopic boom operation range restriction device, 18; second telescopic boom turning position detector, 19; second telescopic boom length detector, 20; operation restriction signal output unit, L1, L2: permissible operating length of the second telescopic boom, S: permissible operating range (of the distal end of the second telescopic boom),
P: Telescopic axis of posture maintaining member (telescopic post) 4

Claims (2)

[Claims] 1. A vehicle 1, a swivel 2 mounted on the vehicle 1 so as to be capable of swinging drive, a first telescopic boom 3 mounted on the swivel 2 so as to be capable of driving up and down, A posture maintaining member 4 attached so as to maintain a constant ground posture regardless of the up-and-down movement of the telescopic boom 3, and a second telescopic boom 5 having a base end thereof attached to the posture maintaining member 4 so as to be capable of horizontal turning drive. And a worktable 6 attached to the distal end of the second telescopic boom 5, and the bending force from the second telescopic boom 5 side to bend the first telescopic boom 3 along the undulation locus plane. Is set within a range where the aerial work vehicle falls down or the first telescopic boom 3 is not damaged by the bending force along the undulating locus surface in a state where the second telescopic boom 5 is turned and extended so that the maximum is obtained. First telescopic boom operating tolerance Obtaining first telescopic boom operation range restricting apparatus so as to restrict the driving of the first telescopic boom 3 12
A second telescopic boom operating range restricting device 17 for use in an aerial work vehicle comprising: a second telescopic boom turning position detector 18 for detecting a turning position (angle) of the second telescopic boom 5; A second telescopic boom length detector 19 for detecting the length of the telescopic boom 5, and a detection signal from each of these detectors 18, 19 for receiving a detection signal from each of the telescopic driving device 11 and the turning driving device 10 of the second telescopic boom 5. An operation restriction signal output unit 20 for outputting an operation restriction signal to the control units 11a and 10a, wherein the operation restriction signal output unit 20 is within the allowable operation range of the distal end of the second telescopic boom 5; The second telescopic boom 5 is perpendicular to the undulating trajectory surface of the first telescopic boom 3 with respect to the second telescopic boom operation allowable length L1 when the wing 5 turns in the direction along the undulating trajectory surface of the first telescopic boom 3. When turning in the direction An operation allowable range in which the second telescopic boom operation allowable length L2 is set short is stored, and the second telescopic boom obtained from the detectors 18 and 19 and obtained from the length and the turning position of the second telescopic boom 5 is stored. When the actual position of the distal end of the second telescopic boom 5 attempts to deviate from the permissible operating range according to this memory, the restriction signal for restricting the extension and revolving movement of the second telescopic boom 5 in a direction that promotes the departure is described above. A second telescopic boom operating range restricting device at a high place, which is configured to output to the control units 11a and 10a of the telescopic driving device 11 and the turning driving device 10. The posture maintaining member is a telescopically drivable telescopic post in which lower post sections and are sequentially and telescopically inserted into upper post sections and, respectively. The uppermost post section 21 is constituted by a telescopic post attached to the tip of the first telescopic boom 3 so that P is vertical, and the second telescopic boom 5 is the lowermost post section 2 of the telescopic post.
The second telescopic boom operating range restricting device for an aerial work vehicle according to claim 1, wherein the second telescopic boom is mounted on a lower end of the third work unit so as to be capable of horizontal turning drive.