JPH0655796U - chisel - Google Patents

Abstract

(57) [Summary] [Purpose] The blade is stored inside the tool box to prevent injuries when it is placed in the tool box, and the blade does not rust even if it is not specially maintained. Provide a chisel that can maintain sharpness. [Structure] The blade 19 is integrated with the blade holder 3 and is inserted into the tubular main body 2 together with the knock member 5. A liquid retaining member 7 impregnated with oil and fat is adhered to the vicinity of the tip of the blade 19 in the main body 2. The main body is provided with a hole 11 in which two holes are joined by a groove 15, and the engaging portion 32 of the knock member 5 is engaged with the hole 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chisel.

[0002]

[Prior art]

 A chisel is a blade used for engraving and engraving, and is widely used as a teaching material for children and students in school education as well as being used by artists for creative activities. The structure of a conventional chisel was a simple one in which a handle made of wood or resin was attached to a blade having various cutting edge shapes such as a round sword, a cutting sword, and a flat chisel.

[0003]

[Problems to be solved by the device]

 The conventional chisel has a structure that has been used for a long time, but since it is always stored in the open state, there was a constant accident that accidentally injured a finger or the like when taking it out of the tool box. In particular, a chisel is the only blade used by elementary school children as a teaching material, and despite the need to be careful to prevent inadvertent injuries, the chisel of conventional technology has no safety measures. Was not done.

Further, as described above, most of the consumers of chiseling blades are children and students, and the carving knife has a product characteristic that it is difficult to maintain it sufficiently. For this reason, the conventional chisel has a problem that the blade portion is quickly rusted and the sharpness deteriorates within a short period of time.

The present invention pays attention to the above-mentioned drawbacks of the prior art, is extremely safe for children to use, and the blade portion does not rust even if it is not specially cared for, and it has a good sharpness forever. It aims at providing the chisel which can maintain.

[0006]

[Means for Solving the Problems]

 The present invention for achieving the above-mentioned object is, in part, a chisel that is inserted into a tubular body so that the blade can come in and out and that the blade is projected from the body by operating a knock member. It has a safety device with an engaging part and a releasing member, and the engaging part is elastic and prevents the blade from protruding due to engaging a part of the main body to operate the knocking member. By operating, the engaging portion moves against the elastic force, and the engagement with a part of the main body is released.

Further, in particular, the invention focused on preventing rusting of the blade is such that the blade is inserted into and out of the tubular body and the blade is projected from the body by operating the knock member. An engraving knife, characterized in that a liquid-retaining member impregnated with a rust preventive is inserted into the cylindrical body.

[0008]

[Action]

 Since the chisel of the present invention has the blade inserted in the tubular body, when it is stored in a tool box or a desk, the blade is inside the body and is not exposed to the outside. Particularly, in the chisel according to claim 1, there is provided a safety device for preventing the blade from projecting by operating the knock member, and the safety device has an engaging portion for engaging with a part of the main body. It Therefore, when the blade is inside the main body, the engaging part of the safety device is engaged with a part of the main body, and the blade protrudes from the main body even if the knocking member is simply knocked. There is no such thing. In the chisel of the present invention, the engagement between the main body and the engaging portion is forcibly released by first operating the release member exposed from the main body, and the blade is exposed only after the knock member is operated. .

When the use of the chisel of the present invention is finished, the blade is housed in the main body by a predetermined operation. In the chisel according to the present invention, since the engaging portion of the safety device has an elastic force, the engaging portion is restored by housing the blade in the main body and automatically engages with a part of the main body. Suru Once the blade is housed in the main body, it will not protrude unless both the release member and the knock member are operated.

Further, in the chisel according to claim 2, since the liquid retaining member impregnated with the rust preventive is inserted in the main body, when the blade is stored in the main body, the storing process or the blade. The blade contacts the liquid retaining member in the process of protruding. Then, the rust preventive impregnated in the liquid retaining member exudes and the rust preventive is applied to the blade.

[0011]

【Example】

 Hereinafter, a specific embodiment of the present invention will be described. FIG. 1 is a front sectional view of a chisel according to a specific embodiment of the present invention. FIG. 2 is a front view of a main body used in the chisel of FIG. FIG. 3 is an exploded perspective view of the chisel of FIG. FIG. 4 is a front sectional view showing a state where the blade of the chisel of FIG. 1 is projected. FIG. 5 is a front sectional view of a chisel according to a modified embodiment of the present invention. FIG. 6 is a front sectional view of a chisel according to another modification of the present invention.

1 and 4, reference numeral 1 denotes a chisel according to a specific embodiment of the present invention. The chisel 1 of this embodiment is composed of a main body 2, a blade holder 3, a knock member 5, a spring 6, and a liquid retaining member 7. Explaining sequentially, the main body 2 is molded by injection molding of polypropylene resin or other thermoplastic resin, and its shape is a hollow cylindrical shape. The tip of the main body 2 is thinly formed in a taper shape, and a rectangular blade projection hole 9 is provided at the tip. On the other hand, the rear end side of the main body 2 is open. Further, an engagement hole 11 is provided in an intermediate portion of the peripheral surface of the main body 2. As shown in FIGS. 2 and 3, the engaging hole 11 is formed by connecting two rectangular holes by the groove 15, and the hole located at the tip side acts as the blade receding prevention hole 12, and the other hole. The hole acts as a safety lock hole 14.

As described above, the inside of the main body 2 is hollow, and its cross-sectional shape is circular, but two sliding grooves extending in the axial direction are formed on the inner peripheral surface on the rear side from the blade receding prevention hole 12. 16 and 17 are provided at target positions.

The blade holder 3 is formed by embedding the blade 19 and the holder 20 in one piece by embedding the latter half of the flat chisel 19 in a cylindrical holder 20 made of resin. is there. Here, the outer diameter of the holding portion 20 is slightly smaller than the inner diameter of the main body 2.

The knock member 5 used in this embodiment is one in which the knock portion 22 and the safety device 23 are integrated. Describing from the shape of the knock portion 22, the knock portion 22 is a member that closes half of the knock member 5, and has a solid cylindrical shape. The outer diameter of the knock portion 22 is slightly smaller than the inner diameter of the main body 2, and two sliding protrusions 25 and 26 are provided on the peripheral surface in the axial direction. The inner sliding protrusion 25 is provided near the boundary between the knock portion 22 and the safety device 23. On the other hand, the sliding protrusion 26 is provided on the peripheral surface located on the opposite side of the sliding protrusion 25, is located closer to the rear end portion than the sliding protrusion 25 in the axial direction, and has a sliding length. It is longer than the moving projection 25.

The safety device 23 is integrally provided at the tip of the knock portion 22, and the diameter of the safety device 23 is the same as that of the knock portion 22, but the safety device 23 is different from the lock portion 22. The inside is hollow. That is, in the safety device 23, only the front end portion 27 is solid, and the other portions are hollow. Further, the peripheral surface is not processed at all on the half surface on the side of the sliding projection 25, but the half surface on the side of the sliding projection 26 is notched in a complicated shape. That is, the peripheral surface of one surface of the safety device 23 is provided with notches 29 on both side surfaces, leaving the central portion as shown in FIG. A notch 30 is provided in the remaining center portion where the knock portion 22 is joined. Therefore, the central portion of one circumferential surface of the safety device 23 is cantilevered from the tip end portion 27 to form a tongue-shaped piece 31. Therefore, the tongue-shaped piece 31 has elasticity and elastically bends in the direction of arrow A in FIG. 3 when a force is applied, and returns to the original state when the force is removed.

Further, an engaging portion 32 and a releasing member 34 are provided on the tongue-shaped piece 31. Here, the engaging portion 32 is a rectangular column-shaped protrusion. The release member 34 is integrally molded on the engaging portion 32 and is a rectangular plate member.

The spring 6 is a coil spring having a diameter substantially equal to that of the holding portion 20 of the blade holding body 3. The liquid retaining member 7 is made of a material capable of containing and holding a liquid such as a fiber such as felt or a porous resin or a resin having open cells, and is formed into an L shape. It consists of one holder piece. The liquid retaining member 7 is impregnated with oil as a rust preventive.

Next, the relationship between the respective members of the chisel 1 will be described centering on the main body 2. First, the liquid retaining member 7 is inserted into the main body 2 and adhered around the blade protruding hole 9 at the tip of the main body 2. Moreover, the blade holder 3 is slidably inserted into the main body 2. Then, in a state where each member is assembled, the tip of the blade 19 of the blade holder 3 is located in the blade protruding hole 9 of the main body 2 as shown in FIG. Further, the tip of the blade 19 is in contact with the liquid retaining member 7 arranged around the blade protruding hole 9.

The spring 6 is compressed and inserted between the tip of the main body 2 and the blade holder 3, and constantly presses the blade holder 3 toward the rear of the main body. The knock member 5 is inserted into the main body 2 with the front end portion 27 abutting on the rear end of the blade holder 3, and a part of the rear end portion is exposed from the main body 2. Further, the knock member 5 has the sliding projections 25 and 26 fitted into the sliding grooves 16 and 17 provided in the main body 2, and can slide in the main body 2 without rotating. Further, the engaging portion 32 of the knock member 5 is inside the hole 11 on the side surface of the main body, and the releasing member 34 is exposed to the outside from the hole 11.

Next, the operation of the chisel 1 of the present embodiment will be described in the order of use. When the chisel 1 is put away in a tool box or the like, the blade 19 is housed in the main body 2 as shown in FIG. That is, the engaging portion 32 of the safety device 23 is inside the safety lock hole 14, and the engaging portion 32 receives the pressing force of the spring 6 so that the engaging portion 32 is at the rear end portion 33 of the safety lock hole 14 (see FIGS. 2 and 3). Is abutted against.

In this state, if the top portion 35 of the knock member 5 is simply pushed, the engagement portion 32 comes into contact with the front end portion 36 (see FIGS. 2 and 3) of the safety lock hole 14, and the knock member 5 is pushed. Block forward. Therefore, even if the top 35 of the knock member 5 is simply pushed, the blade 19 does not project.

When the user uses a chisel, the finger pushes the release member 34 in the circumferential direction, that is, the arrow A direction in FIG. 3, or the arrow B direction in FIG. Then, the tongue-shaped piece 31 of the knock member 5 elastically twists and deforms, the engaging portion 32 of the knock member 5 leaves the safety lock hole 14 of the hole 11 of the main body, and coincides with the groove 15, so that the engaging portion 32. And the engagement relationship between the safety lock hole 14 of the main body 2 is released. Then, the user continues to push the release member 34 and maintains this state, and pushes the top portion 35 of the knock member 5. Then, the engaging portion 32 of the knock member 5 slides in the groove 15, and the knock member 5 slides in the main body 2 toward the tip side. Then, the blade holder 3 is pushed by the tip portion 27 of the knock member 5 and also slides inside the body 2 toward the tip side, and the blade 19 is guided to the blade protruding hole 9 and passes through this hole 9. Project to the outside. When the blade 19 slides in the blade protruding hole 9, the rust preventive agent oozes out little by little from the liquid retaining member 7, and the rust preventive agent is spread over the entire blade 19 as the blade 19 moves. .

Then, when the knock member 5 is continuously pushed, the engaging portion 32 reaches the blade retreat preventing hole 12 of the hole 11 of the main body 2 and stops. Then, the engaging portion 32 is returned by the elastic force of the tongue-shaped piece 31, and is engaged with the blade receding prevention hole 12. Therefore, even if the user releases his / her hand from the knock member 5 and the knock member 5 is pushed rearward by the force of the spring 6, the engaging portion 32 engages with the rear end portion 37 of the blade retreat preventing hole 12. Stop. Therefore, the blade 19 stops while protruding from the blade protruding hole 9 to the outside, and the user can engrave with the engraving sword 1 of this embodiment.

If the user pushes only the release member 34 and does not push the knock member 5, the elastic force of the tongue piece 31 causes the engaging portion 3 2 to move when the user releases the release member 34. Returns to the state where the knock member 5 is fixed. Therefore, in the chisel 1 of the present embodiment, the blade 19 does not project except when the release member 34 and the knock member 5 are pushed simultaneously.

When the engraving work is completed, the release member 34 is pushed in the direction of arrow A without touching the top 35 of the knock member 5. Then, the engagement of the engaging portion 32 with the blade receding prevention hole 12 is released, and the blade 6 is pushed by the spring 6 to move toward the rear of the main body 2, and the blade 19 is inserted into the blade protruding hole 9. Is stored in. Further, even when the blade is retracted, the rust preventive exuded from the liquid retaining member 7 is spread on the entire blade 19.

In the embodiment described above, the structure of the safety device is the structure including the engaging portion 32 formed of a quadrangular prism-shaped projection and the plate-like releasing member 34 integrally formed on the engaging portion 32. Disclosed. This structure is extremely safe because the knocking member must be pushed while pushing the release member in the circumferential direction when the blade 19 is projected, so that it is highly recommended and is especially recommended for a chisel for children. However, the present invention is not limited to the structure of the above-mentioned safety device, and a structure as shown in FIG. 5, for example, is also possible. In the chisel 50 shown in FIG. 5, only the engaging portion and the releasing member of the safety device and the hole of the main body are different from the above-described embodiment, so the same parts as those in the previous embodiment are designated by the same reference numerals. And the description is omitted.

In the chisel 50, two independent holes, that is, a blade receding prevention hole 52 and a safety lock hole 53, are provided on the side surface of the main body 51. That is, in the chisel 50, there is no groove connecting the holes to the main body 51. The knock member 55 is similar to the previous embodiment in that the engaging portion 56 has a square pole shape, but the chisel 50 of the present embodiment does not have a plate-shaped releasing member, and the engaging portion 56 has the same shape. The top acts as the release member 57.

When using the chisel 50 of this embodiment, the release member 57 is pressed toward the center of the main body 51, that is, in the direction of arrow C in FIG. Then, the tongue piece 31 of the knock member 55 elastically bends in the direction of the arrow C, and the engaging portion 56 sinks below the safety lock hole 53. At the same time, when the knock member 55 is pushed in the axial direction, the engaging portion 56 comes into contact with the inner peripheral surface 58 of the main body 51 and slides. Then, when the engaging portion 56 coincides with the blade receding prevention hole 52, the engaging portion 56 projects to the outside of the main body 51 by the elastic force of the tongue piece 31 and engages with the blade receding prevention hole 52.

Further, in addition to the embodiment described above, when a safety device is not particularly required and only anti-rust operation of the blade is expected, as shown in FIG. 6, a slope is provided on the tip side of the engaging portion 59. It is also possible to adopt a configuration provided with. According to this configuration, the blade 19 can be projected by simply pushing the knock member 55. That is, when the knock member 55 is pushed, the inclination of the engaging portion 59 hits the hole 60, a force toward the center of the tongue 31 is generated, and the tongue 31 bends. Therefore, the engaging portion 59 sinks into the body of the hole 60, and the knock member 55 can be moved forward. As a measure for applying an elastic force to the engaging portion, the configuration using a tongue-shaped piece has been illustrated in the embodiment, but a measure using a force of a spring or the like is effective instead.

In the above-described chisel, the knock members are all exposed at the rear end of the main body, and the configuration in which the exposed portion is pushed in the axial direction is disclosed. This configuration merely shows one example of the knock member, and as the configuration of the knock member, any known configuration adopted in a ballpoint pen or the like can be applied. A typical configuration other than the one adopted in this embodiment is, for example, one in which the knock member is exposed on the side surface of the main body. Further, it is also possible to apply a configuration of a knock member that has a cam inside and in which the blade protrudes with the first knock and the blade returns with the second knock.

[0032]

[Effect of device]

 Since the blade of the present invention is stored in the main body during storage and is not exposed to the outside, the blade is not accidentally touched and injured, which is highly safe.

In the chisel according to claim 1, even if the knocking member is simply knocked, the blade does not protrude from the main body, and the blade protrudes only when the releasing member is operated. Therefore, there is an effect that the safety is extremely high.

Further, in the chisel according to claim 2, since the liquid retaining member impregnated with the rust preventive is inserted in the main body, when the blade is stored in the main body, the storing process or the blade. The rust preventive agent is applied to the blade in the process of protruding, which has the effect of preventing rust on the blade.

[Brief description of drawings]

FIG. 1 is a front sectional view of a chisel according to a specific embodiment of the present invention.

FIG. 2 is a front view of a main body used in the chisel of FIG.

3 is an exploded perspective view of the chisel of FIG. 1. FIG.

FIG. 4 is a front cross-sectional view showing a state in which the blade of the chisel of FIG. 1 is projected.

FIG. 5 is a front sectional view of a chisel according to a modified embodiment of the present invention.

FIG. 6 is a front sectional view of a chisel according to another modified embodiment of the present invention.

[Explanation of symbols]

 1,50 Carving knife 2,51 Main body 3 Blade holder 5,55 Knock member 7 Liquid retaining member 12,52 Blade retreat prevention hole 14,53 Safety lock hole 22 Knock portion 23 Safety device 31 Tongue-shaped piece 34,57 Release member 32, 56 Engagement part

Claims (2)

[Scope of utility model registration request] 1. A chisel that inserts a blade into and out of a tubular body so that the blade can be projected from the body by operating a knock member, the safety device including an engaging portion and a releasing member. The engaging portion has an elastic force and prevents the blade from protruding due to operating the knock member by engaging with a part of the main body, and the engaging portion resists the elastic force by operating the releasing member. Then, the chisel is characterized in that the engagement with a part of the main body is released. 2. An engraving sword in which a blade is inserted into and out of a tubular body and the blade is projected from the body by operating a knock member, wherein the tubular body is impregnated with an anticorrosive agent. An engraving knife characterized in that the liquid retaining member is inserted.