US131423A - Improvement in bolt-cutters - Google Patents

Description

J. R! BROWN.

Improvement in Bolt-Cutters.

N0. 131,423. Patented Sep.17,18-72.

UNITE Srn'rns JAMES R. BROWN, OF GAMBRIDGEPORT, MASSACHUSETTS.

IMPROVEMENT IN BOLT-CUTTERS;

Specification forming part of Letters Patent No. 131,423, dated September 17, 1872; antedated September To all whom it may concern:

Be it known that I, JAMES R. BROWN, of Cambridgeport, of the county of Middlesex and State of Massachusetts, have made anew and useful invention having reference to what are termed Bolt-Gutters; and do hereby declare the same to be fully described in the fol lowing specification and represented in the accompanying drawing, of which- 7 Figure 1 is a front elevation, and Fig. 2 a longitudinal and vertical section, of my improved bolt-cutter, which, in the main,is analogous to that for which Letters Patent No. 107 ,438, dated September 20, 1870, were granted to me, and also to that described in an application for a patent filed by me in the Patent Office on October 12, 1870, and allowed on December 24, 1870.

Each of the said bolt-cutters last mentioned had its movable cutter-carri er constructed with two racks or series of teeth, disposed on opposite sides of it, and engaging with sectoral or areal ranges of teeth projecting from two levers pivoted to the stationary cutter head or plates projecting therefrom These teeth being liable to become broken by the great strain and wear to which they necessarily are subjected while the implement is. in use, I have sought to dispense with them and to employ in their stead other devices, not only of adifferent character, but operating in a different manner, and with far greater effect, aswell as with little or no liability of breakage, comparatively speaking.

In the drawing, A denotes the cutter-head or yoke, provided with the stationary cutter a, and a movable or sliding chisel, 'b, the latter being soeketed into a carrier, B, so as to be capable of being moved endwise therein by means of an adjusting-screw, O, screwed into the carrier, all being arranged in manner as represented. The movable cutter is grooved in its side lengthwise, as seen at O, to receive a stud, cl, projecting from the yoke, the groove and stud serving to prevent the cutter from revolving. To the yoke or cuttenhead A two levers, D D, are pivoted, their fulcrums or j ointpins being shown at e e. The said levers D D are formed with shoulders or abutments ff, and the cutter-carrier B is also provided with shoulders or abutments g g, all being arranged as represented. Between the shoulders of the carrier B and those of the levers D D, and also between the carrier and the two levers, are two toggles, E E, each of which is hinged or pivoted at one end to the carrier and at the other to one of the levers. When the levers are about in'parallelism the abutments ff, at their inner edges by contact with the cuttercarrier, serve as stops to arrest the further inward motion of the levers, and as a consequence the advance of the movable cutter toward the stationary cutter. On taking hold of the levers and moving them apart the cutter-carrier B will be retracted by the toggles. So, when the levers are moved toward each other, the toggles will advance the said carrier, the force of the propulsion constantly increasing as the advance is made.

Fromthe above it will be seen that thetoggles have one important advantage over toothed racks and sectoral gears, which, while in operation, advance the cutter-carrier equal distances, with equal arcs of movement of the levers and with a constant force; whereas with the toggles such is not the case, as with them during the movements of the levers toward each other the advance of the cutter-carrier constantly decreases, and the force of propulsion as constantly increases with no danger of breakage of any part, as the abutments or shoulders of the levers and the cutter-carrier screw it from the carrier the movable cutter may be drawn out of the carrier forbein g sharpened, or for any other purpose.

I herein make no claim, in a boltcutter, to i the toothed stock of the movable cutter and toothed segment-levers arranged as shown in the United States Patent No. 65,391. Nor do I claim the combination of knives, levers, screw, frame, and top and bottom plates, constructed and arranged in manner and to operate as described in such patent or in the reissue thereof, dated March 14, 1871. I make no claim to anything shown or described in the United States Patent No. 105,629.

I clain1 1. My improved bolt-cutter, as having the toggles E E, the levers D D, the cutter-carrier B, cutter b, and the cutter-head A, constructed, arranged, and combined in manner as shown and described.

2. I claim the adjusting-screw O, and the movable cutter or chisel b, as made and applied together and to the cutter-carriers, as set forth, the chisel under such application of it being provided with the groove 0, open at its front end to receive the stud d from the carrier, all being as specified.

- JAMES B. BROWN. Witnesses:

It. H. EDDY, J. It. SNOW.

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