US716170A - Bevel-protactor. - Google Patents

Description

No. 7l6,|70. Patented Dec. l6, I902. C. H..BARNES.

BEVEL PROTRAGTOR.

(Application filad July 25, 1902.) (N o M 0 d e l-.)

61km I THE uumus mews mi. Pno'rqumou wnsumcn'on. n. c,

and illustrated in the accompanying draw- .for the jaw 6. throughout a portion of its length, is split at NITED r FFTCE.

CHARLES H. BARNES, OF ILION, NEW YORK, Ass1eNoR TO G ORGE E.

' BARNES, E GOUVERNEUR,.NEW YORK.

BEVEL- PROTRACTO R.

SPECIFICATION forming part of Letters Patent No. 716,170, dated December 90 Application filed July 25, 1902. Serial No. 116,978. (No model.)

My invention relates to bevel-protractors;

and the object of the same is to construct a device for measuring tapers-that is, the divergence of two non-parallel sides of a piece of work and also the diameter of the work.

The simple and novel construction designed by me in carrying out my invention is fully described in this specification and claimed,

ings, forming a part thereof, in which-- Figure l is a plan view of my device.

2 is an edge View of the same.

longitudinal section of the same.

Fig. Fig. 3 is a Fig. 4 is a plan view of the beam and one of the sectors.

Fig. 6 is a de- Fig. 7 is a per- ,A jaw 6 is mounted on the sector 3. It bears a guide 7, which engages the curved edge of the sector 3 and has an arm 8 formed integral therewith, which extends over the car t and has a threaded aperture 9 therein, which registers with the aperture 5. A center 11 fits in the apertures and 9 and serves as a pivot The center 11 is threaded 11 and bored at 11 to accommodate a threaded plug 12, which serves to expand the center 11, and thereby secure it in place. The geometrical, center of the are of. the quadrant is in alinement with the innerface of j the jaw 6 to adapt it to measure angles of 14 to expose the graduations on the quadrant, which can be read by meansot' an indeX 13, formed on the flange 13. A thumbnut 6" serves to clamp the jaw 6.

Slidingly mounted on the beam 1 is a quadrant 15, bearing guide- flanges 16 and 17, which engage the straight parallel sides of the beam 1. The quadrant is graduated similar to the quadrant 3 and bears an ear 18, having an aperture 19 therein to accommodate a center 19 of similar construction to the center 11 and which fits an aperture 20, formed in an ear 20, integral with a jaw 21. The jaw 21 is similar in construction to the jaw 6, and the geometrical center of the arc of the quadrant 15 is in alinement with theinner surface of the jaw. It should be noted (see Fig. 2) that the centers 11 and 19 are so located that they are in axial alinement when the inner faces of the jaws 6 and 21 are in contact, which makes the divergence measured the true divergence.

A set-screw 22 is mounted in an aperture in the flange 16 and is provided with a head 22 and a foot 22", which bears on the beam and serves to clamp the quadrant 15 against all movement. A head 23, bearing guides 24, is adjustably mounted on the beam 1 and is provided with a set-screw 25, arranged to clamp the head 23 at any point desired. An adjusting-screw 26 connects the head 23 and the quadrant 15 and is constructed to be 0perated by a corrugated adjusting-nut 27, fitting thereon and engaging a slot 28 in the head 23. By this arrangement the quadrant can be adj nsted very accurately in measuring diameters in calibrating.

In operation, the jaws 6 and 21 are set parallel, and if their indices do not stand at the zeros on the quadrants 3 and 15 the index error is noted to be applied to all measurements. The article the taper of which is to be measured is then placed adjacent to the jaws, which are adjusted pivotally until the articles can be placed between them in contact with the inner faces of the jaws. If the pivotal adjustment is not sufficient, the centers 11 and 19 are separated by adjusting the quadrant 15 on the beam 1 by means of the adjusting-screw 26 and nut 27. If a large adjustment is desired, the head 23 is first set approximately and clamped, after which the adjustment is made more accurate by means of the adjusting-screw 26. After the adjustments have been completed the quadrants are read, and the sum of these readings will be the taper required.

In using my device as a caliper the jaws are first set parallel and clamped by means of the thumb-nuts 6 thereon, after which the jaw 21 is adjusted laterally by means of the adjustable head 23 and screw 26. The reading on the scale 2 on the beam 1 will give the re quired diameter of the work.

I-do not wish to be limited as to details of construction, as these may be modified in many particulars without departing from the spirit of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a device of the class described, the combination of a graduated beam, of a graduated sector connected to one end of said beam, a jaw pivoted at the center of the arc of said sector, a graduated sector adj ustably mounted on said beam, and a jaw pivoted at the center of said last-mentioned sector, the centers of said sectors being located in a straight line extending parallel to said beam, said jaws being arranged to cooperate with said sectors and with each other to measure tapers of work placed between them, substantially as described.

2. In a device of the class described, the combination with a graduated beam,ofa graduated sector mounted on said beam, a jaw pivoted to said sector, a graduated sector bear ing guides engaging said beam, and a jaw pivoted to said last-mentioned sector, the centers of said sectors being located in a straight line parallel to the edge of said beam, substantially as described.

3. In a device of the class described, the combination with a graduated beam,ofa graduated sector mounted onsaid beam, a jaw pivoted to said sector, a graduated sector bearing guides engaging said beam, a jaw pivoted to said last-mentioned sector, and means for adjusting said guides on said beam to regulate the distance between the centers of said sectors, the centers of said sectors being located in a straight line parallel to said beam, substantially as described.

4. In a device of the class described, the combination with a graduated beam,ofagraduated sector mounted on said beam, a jaw pivoted to said sector, a graduated sector bearing guides engaging said beam, the centers of said sectors being located in a straight line parallel to said beam, a head bearing guides engaging said beam, means for clamping said head at any point on said beam, and an adjusting-screw connecting said head and said last-mentioned sector, substantially as described.

5. In a device of the class described, the combination of a pair of pivoted jaws located to cooperate to measure tapers of articles placed between them, graduated arcs located to cooperate with said jaws, and means for adjusting the distance between the pivots of said jaws, the pivots of said jaws being located in a straight line parallel to said beam, substantially as described.

In testimony whereof I have here hereunto set my hand in presence of two subscribing witnesses.

CHARLES H. BARNES.

Witnesses:

A. 0. BROWN, O. H. BROWN.

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