US351339A - Bolt-cutter - Google Patents

Description

(No Model.)

H. S.. PULLMAN.

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' .gwue/wboz V /MM Jfl UNITED STATES HERBERT S. PULLMAN, OF ROCKVILLE, ASSIGNOR TO THE BILLINGS 8t SPENCER COMPANY, OF HARTFORD, CONNECTICUT.

BOLT-CUTTER.

SPECIFICATION forming part of Letters Patent No. 351,339, dated October 19, 1886.

Application filed March 18, 1886. Serial No. 195,737.

To all whom it may concern.-

Be it known that I, HERBERT S. PULLMAN, of Rockville, in the county of Tolland and State of Connecticut, have invented certain new and useful Improvements in Bolt-Cutters, of which the following is a full, clear, and eX- act description, whereby any one skilled in the art can make and use thesame.

My improvement relates to the class of bolt and rivet cutters that are made up of com pound levers with interlocking parts, whereby great power is obtained in operation.

The object of my invention is to provide a cutting-tool of this class that shall be simple and compact in construction while powerful in operation, and with the handle-levers so connected that they move together and in contact in opening and closing thejaws.

My improvement consists in the combina tion of a pair of cutter-bearing levers pivotaLly connected to a pair of handle-levers, with a cam on the head of each handle-lever adjacent to and in contact with the cam on the other lever, and a loop with cogs in mesh with a cog-wheel fast to each 16V6l he2ld, as more particularly hereinafter described, and pointed out in the claims.

Referring to the drawings, Figure 1 is a side view of a pair of bolt-cutters embodying my improvement, with the cutter-jaws closed and parts of the device cut away to show construction. Fig. 2 is a detail side view of the upper part of the tool, showing the cutting-jaws open and part of one lever-head cut in section to show construction. Fig. ,3 is a detail view in longitudinal section of the tool on plane denoted by line 00 w of Fig. 1.

In the accompanyingdrawings, the letter A denotes a pair of cutter-levers, and B a pair of handle-levers, with the link C extending across the heads of the latter pair and in contact with the pivot f. The cutter-levers a a, making up the pair A, have a cutting jaw or blade, (1, and are pivoted at a point near the 5 jaw to a strap, d, and at the end opposite the blade to the head b of the lever b of the pair B. Such lower end of each cutter'lever is preferably inserted in a mortise, e, in the outer edge of the head of each lever-handle, and a pin or pivot, f, passes through both parts and connects the lower end of the cutter-lever with (No model.)

the upper part of the handle-lever. The head of each handle-lever is broadened in the plane of the motion of the levers, and on the upper and inner edge of such broadened head a cam is formed on a curve eccentric to the pivot f. This cam-surface bears a number of teeth in termeshing with a like series of teeth on the cam-surface on the opposite lever-head. On one side of the lever-head, and adjacent to the pivotf, is secured or formed integral with the head a circular lug, g, having teeth on one side in mesh with like teeth 0, formed along the in ner side of the link C. This link C is held from lateral displacement by means of the broadened head f of the pivot f, the edges overhanging the link to a degree sufficient for this purpose.

\Vhen the several parts are put together so as to occupy the relative positions shown in Fig. 1, the outward spreading of the leverhandles causes the surfaces of the cams to roll on each other, and by bringing the pivots f nearer together the jaws of the cutter-levers are opened. The function of the strap, with its teeth or cogs intermeshing with those on the handle-lever heads, is to maintain the faces of the cam in rolling contact-that is, to pre vent them from spreading apart, so that the high point on one cam would come in contact with the lower point on the opposite cam, and thus interfere with the successful working of the device, this successful working depending on the contact in the opening and closing of points of equal height on the opposite cams, which are formed on similar curves.

The advantage of this construction is that the handlelevers may be directly pivoted to the cutter-levers,and may bear the inward facing cams held in direct contact with each other, whereby the full leverage due to the ratio between the short and long arms of the lever-handles may be made use of at the begin ning of the cutting operation and also during the operation.

I claim as my improvement- 1. In combination with a pair of cutterlevers, a pair of handle-levers connected to each other and to each cutter-lever by a single pin or pivot, and the link bearing a series of teeth in mesh with a toothed projection on each handle-lever head, all substantially as described, and for the purpose set forth.

2. In combination with the cutter-leversaa, ing intermeshing teeth, and the laterally-propivotally connected to each other, the leverjecting lugs with teeth in mesh with teeth on handles b, each pivoted to one of the cutterthe link 0', the link, and the pivotsf, each levers and having a cam formed on the inner uniting the link and a cutter-lever and handle- 15 5 edge of the broadened head, and bearing alug lever, all substantially. as described, and for With teeth in mesh with the teeth on the leverthe purpose set forth. connecting link 0, all substantially as described, and for the purpose set forth. HERBERT: PULLMAN' 3. In combination, a pair, A, of cutter-levers Witnesses: IC bearing cutting-blades, a pair, B, of handle- CHAS. L. BURDETT,

levers with inward-facing similar cams bear- EUGENE P. PELTON.

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