US1032580A - Wrench. - Google Patents

Description

E. H. ANDERSON.

RENGH.

APPLIOA FILED MAR. a, 1912.

1,032,580. Patentd July 16, 1-912.

\X/IT ESSEi' UNITED STATES PATENT OFFICE.

EDWARD H. ANDERSON, 0F DURHAM, MAINE, ASSIGNOR OF ONE-HALF TO MICHAEL BROWNS TEIN, OF LEVVIS'ION, MAINE.

WRENCH.

Specification of Letters Patent.

Patented July 16, 1912.

Application filed March 6, 1912. Serial No. 681,914.

To all whom it may concern: I 1

Be it known that I, 'EDWARD I-l. ANDER- soN, a citizen of the United States, residing at Durham, in the county of Androscoggin and State of Maine, have invented. certain new and useful Improvements in Wrenches, of which the following is a specification.

In the drawing herewith accompanying and forming a part of this application, F

ure 1 is a side elevation of my improved wrench partly in section; Fig. 2 is an inside side view of the movable jaw; Fig. 3 is a side view ofthe pawl. operating lever; Fig. 4 is a vertical sectional view of the pawl;

Fig. 5 is a plan view of the pawl lever returning spring before being bent to position; and Fig. 6 is an edge view of the pawl, pawl lever and spring'assembled.

Same reference characters indicate like parts in the several figures.

In the drawings A is the handle of the wrench, B the shank, C the fixed jaw and D the movable jaw. The movable jaw is provided with an' endwise shank receiving socket E and moves back and forth 'on the shank relative to the fixed jaw.

In the front of the movable jaw is a pawl lever receiving opening F and on the inside of each side of the movable jaw are forwardly extending angular grooves G formed one on each side in the inside of the movable jaw. In the opening F is mounted a pawl operating lever H provided with a projecting finger piece I and trunnions J projecting slightly beyond the sides of the pawl lever, as seen in Fig. 6, whichtrunnions take into and travel in said grooves G and against the angular projection K which forms one of the sides of said groove. Pivotally attached to the underside of the pawl lever and sliding in rearwardly inclined grooves Gr formed on each side in the inside of the movable jaw is a ratchet pawl L provided with ratchet teeth M adapted to engage the teeth on a rack N in the face of the shank of the wrench. The pawl is bifurcated forming a lever receiving socket O and ears Q to which the pawl lever is pivotally secured by a pivot P passing through ears Q, of the pawl and the pawl lever.

The lpawl sets diagonally relative to the shank of the wrench when in position and the face R is in engagement with and slides against a similar inclined face S on the sliding jaw.

The pawl lever is held in locked position by the constant tension of a spring T arranged in any convenient way. As shown it consists of a spring provided with laterally extending ears U, one on each side, which take into ear receiving sockets V in the face R of the pawl. It is then bent around the pawl through the socket 0 up against the underside IV of the pawl lever, so that, when the pawl lever is moved outwardly to unlock the pawl, it compresses the spring W toward-the shank between the projections K, and as soon as the pawl is released the tension on the spring bearing against the outer end of the pawl lever turns it back into the position shown in Fig. 1. y

In assembling the parts the pawl lever is inserted through the opening in the end of the movable jaw, the trunnions taking into'the grooves G. The pivoted pawl is then inserted in the open outer end of the movable jaw and properly positioned relative to lever I. The lever and pawl are then moved down until the hole for pivot P comes directly opposite a hole Z in the wall of the movable jaw, in which position the pivot pin P can be inserted through said hole Z, thus pivoting pawl and pawl lever together.

It is to be noted that, the pawl extending diagonally to the shank in the groove between sides S and the projection K and the rack teeth being substantially parallel with the direction of the teeth of the rack, it is always easy to disengage the pawl from the rack.

To adjust the movable jaw on the shank, the pawl is raised from the rack by raising the outer end of the pawl lever. As the outer end is raised the trunnions move down in the groove G toward the shank of the wrench, compressing the spring and lifting the pawl teeth out of the rack. As soon as the pawl is clear of the rack the jaw can be moved into engagement with the object to be gripped. The pawl lever is then released and the spring returns the pawl immediately into engagement with the rack.

The spring may be omitted if desired. Changes in the shape of the pawl lever and pawl and the method of connecting them up and adapted to be moved into and out of engagement with said rack, a pawl operating lever pivotally attached to said pawl and pivotally mounted in said movable jaw, a forwardly extending guide groove in the inside of the movable jaw and laterally extending trunnions on the pawl lever adapted to travel in said groove.

2. In a monkey wrench, a shank provided with a rack on the edge thereof and two, aws, one fixed and the other movable, rearwardly and forwardly extending grooves in the 1ns1de of the movable aw, a ratchet'pawl mounted in said rearwardly extending groove adapted to be moved into and out of engagement with said rack, a pawl lever pivotally connected with said pawl and provided with laterally extending trunnions adapted to take into and travel in said forwardly extending grooves.

3. In a monkey wrench, a shank provided with a rack and with two jaws, one fixed and the other movable, the movable jaw be ing provided with rearwardly and forwardly extending grooves in the inside walls thereof inclined to the rack,a ratchet pawl adapted to engage said rack, a pawl actuating lever pivotally attached to said pawl and to said jaw and provided with trunnions adapted to travel in said forwardly extending grooves and means for automatically returning the pawl lever to its down position and holding it yieldingly in its down position. i

4. In a monkey wrench, a shank provided with a rack and with two jaws, one fixed and the other movable, said movable jaw being provided with rearwardly and forwardly extending grooves in the inner walls thereof inclined to the plane of the rack and a ratchet pawl adapted to be moved into and out of engagement with said rack, a pawl lever pivotally mounted between the arms of the pawl and provided with trunnions adapted to travel in said forwardly extend ing grooves, and a spring secured, one end to the pawl and the other end extending out along and in the path of the inner free end of the pawl lever, whereby the spring tends to return and hold the pawl lever in its down position.

EDlVARD H. ANDERSON.

\Vitnesses:

BERTHA M. BENSON, J OHN D. CLIFFORD, J r.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G.

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