US1999105A - Protractor - Google Patents

Description

April! 23, 1935. 9 J. MILLA 1,999,105

PROTRACTORI Filed Dec. 11, 1931 a 10 .0 l a -1.

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JOSEPH MILL r7 INVENTOR I r BY my Maw/v6? ATTORNEY Patented Apr. 23, 1935 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to measuring devices.

The invention will be fully and comprehensively understood from a consideration of the following detailed description when read in connection with the accompanying drawing which forms part of the application with the understanding, however, that the improvement is capable of extended application and is not confined to the exact showing of the drawing nor to the precise construction described and, therefore, such changes and modifications may be made therefrom as do not affect the spirit of the invention nor exceed the scope thereof as expressed in the appended claim.

In the drawing:

Fig. 1 is a plan view of the device or tool.

Fig. 2 is a section taken approximately on the broken line 22, looking in the direction of the arrows.

Fig. 3 is a perspective view of part of the device shown in Fig. 1.

Fig. 4 is a section taken approximately on the line 4-4 of Fig. 3; and

Fig. 5 is a perspective view of a thread employed in the device.

Fig. 6 is a view taken on line 66 of Fig. 1.

Referring to the drawing for a more detailed description thereof, the numerals I and 8 indicate two members pivotally connected at 9. The numeral I0 indicates a member positioned obliquely to the members I and 8 and adjustably secured thereto, being adapted to slide on the members I and 8 for adjustment. The members I, 8 and III are respectively provided with longitudinal slots Ia, 8a and Ina. to accommodate the movement of screws II and I2 which are employed to hold the members I, 8 and It in a desired relative position, the mentioned screws being provided respectively with nuts II and I2. The screw I I' passes through the slots Mia and Ia while the screw I2 passes through the slots Ita and 8a..

The member I carries on its edges scales 'Ib and 7c, the former being on the outer edge and the latter on the inner edge. The scales lb and lo are both divided into inches but the inches have a different number of subdivisions. A protractor I5 is fixedly secured to the member I to indicate the angular relationship between the members I and 8. This protractor has degree scales I50. and I512 which run in opposite directions. The protractor partly rests on the member i and partly on an extension Id of the member I. The member 8, like the member I, is provided with two different scales, these scales being on the inner and outer edges of the member 8 and respectively numbered 817 and 8c. The member Ill carries two different scales which are respectively labeled with the characters Iflb and H10, the edge joining the scale lllb being preferably beveled. The scales 8b, 8c, Iflb and I90 are in inches but the scales of each pair are differently subdivided.

A protractor II, carrying a degree scale I'Ia, is slidable on the member I, being secured to a member I 8 which is provided with a longitudinal slot I811. The member I8 slides on the back of the member I and is provided with guides I81) and I which respectively contact with the top and bottom of the member I. Protractor I1 is used in reading the angle of the member I6 and it is apparent that inasmuch as the latter member is set at different positions relative to the members I and 8, as necessary, the protractor I! is movable independently of the member I!) so that an edge of the latter member may be set at the middle point of the straight edge of the protractor. The screw I I, provided with nut I I, passes thru the slots la, la. and HM to adjustably hold together the members I8, I and Ill, and it has a square shank I la which engages the. edges of the slots I8a and la.

The device described provides for many relative positions between the various parts and it is useful to tradesmen, such as carpenters, for example, in measuring angles so that material may be properly out.

What is claimed as new and useful is:

An instrument of the character described comprising a first elongated scaled member, a second elongated scaled member pivotally connected to the first mentioned scaled member, said members having longitudinal slots, a third elongated member in alignment with and adjustable longitudinally of said second elongated member and positioned back of the same and having a longitudinal slot and provided with guides engaging said second member, a protractor mounted on said third member, a second protractor secured to one of the pivotally connected members to indicate the angle between the latter members, an oblique elongated scaled member having a longitudinal slot, means for adjustably holding said oblique member to said first member and passing thru the longitudinal slots of said oblique and first members, and means for adjustably holding together said second, third and oblique members, the last mentioned means being a screw provided with a nut threadedly engaging the same, said screw passing thru the slots of said second, third and oblique members and having a squared shank which engages with the edges of the slots of the second and third members.

JOSEPH MILLA.

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