US2478728A - Toggle actuated and adjustably mounted pivoted jaw wrench - Google Patents

Description

V. S. WARD ET AL TOGGLE ACTUATED AND ADJUSTABLY Aug. 9, 1949.

MOUNTED PIVOTED JAW WRENCH i i El...-

Filed Feb. 26, 1946 Vinnent a Z522 6v Gordon 7f. \Z/uTZZJuZJ Patented Aug. 9, 1949 TOGGLE ACTUATED ADJUSTABLY MOUNTED 'PIV'OTED JAW "WRENCH Vincent S. Ward and Gordon K. Hurlbut, Binghamton, N. Y., assignors, by mesne assignments, to B M Manufacturing Corporation, Binghamton, Y., .a corporation of New York Application February 26, 1946, Serial No. 650,242

1 Claim.

This invention relates to wrenches, and more particularly to those of the type disclosed in Patent No. 2,388,5 0, dated November "6., 1945, and issued to F. A. Snell.

In that patent is shown a wrench in which a movable jaw is brought to a. parallel relation with a fixed jawregardless of the spacingof the jaws, by movement of an actuating handle, and the present invention contemplates a stucture by means of which similar results are obtained. The present invention relates to improvements in the type of wrench referred to, and by means of which .a more symmetrical, positively-operating structure results. I

For example, in the wrench of the above-mentioned patent it will be observed that a curved or arcuate adjusting link extends between the movable jaw and the frame of the wrench; that said link provides a curved surface against which the head of an adjusting screw is operative, and that when the jaws are closed, the rear portion of the curved link projects out of the back of the wrench frame, thus providing a mundedprotuberance, tending to widen the wrench, and detracting from its symmetry.

The present invention contemplates the provision of meansby which the use of a curved link of this character is obviated, and the weaknesses of .such an arrangement eliminated.

Another object of the invention is to provide means by which certain parts of the wrench structure are materially strengthened and reinforced, resulting in a. sturdier and highly efiicient wrench of this kind.

These and other objects are attained by the invention, a more particular description of which will hereinafter appear, and the scope thereof be defined by the claims appended hereto.

In the accompanying drawing, Fig. 1 is a side elevation of a wrench constructed according to the invention, the jaws being shown in closed position; Fig. 2 is a side elevation of the wrench in open position, with one of the face plates of the frame removed to show the operating parts; Fig.

3 is an edge view of the wrench, as seen from the right side of Fig. 1; Fig. 4 is a face view of the adjusting link, and Fig. 5 is an edge view of the link, looking at the top edge of Fig. 4.

In the drawing, the frame of the wrench is generally indicated at I, the same including a pair of similarly-shaped side members or face plates designated at 2 and 3. The fixed handle portion of the wrench is composed of the narrowed end parts 40 of the face plates 2 and 3, between which is sandwiched an insert I8 composed of plastic,

.2 wood, or other suitable light weight and strong material. Rivets Iflextending through the :parts Adana through. the insert 18 hold the parts together, with the face plates 2 and 3 thus maintained in suitably spaced relation.

.At, '4' is shown the fixed jaw Which-is mounted between the face plates-at one end and, heldin place -therebetween by means of the rivets '5. or otherequivalzent fastening elements. The fixed jaw imay be'provided: with a serrated gripping face 6 as shown. w

The movable jaw is shown at'8, the same :bein of substantially bell-crank form, and havingrthe head portion 1, formed with the grippingface 9, and having an arm Balocated between the ends of a pair of companion links II and .pivotaliy attached thereto by the pivot pin Ill. The second armillof the movable jaw 8 is pivotally' attached by a pin 22 to the adjusting link 2 I tobe shortly described.

At His shown the actuating handle by-means of which the movable jaw 8 is moved to orzfrom the :fixed jaw 4.. Said handle I 5 has One end located between the ends of the companion links 2H 1 .pivotallysecured thereto by means of the pivot pin vI 2 which has its ends disposed in angular slots 13 formed inthe sides orface plates 2 and '3 of the frame. By movement of the handle Ili -in adirection to or from the fixed handle, pin I2will be causedto ride up and down in the slots I3 in a manner to be described.

At I6 is shown a pair of short companion links which are pivoted at I4 to the actuating handle I5, at a point between the pivot I2 and the free end of said handle, the opposite ends of the links I6 being pivoted on the pin I1, said pin being secured between the sides or face plates 2 and 3 of the frame I.

The construction of the adjusting link 2| will be noted in Figs. 2, 4 and 5, wherein it will be seen that the same is of triangulated shape, being pivoted at its narrower end at 22 to the arm of the movable jaw. The opposite or wider end of the link 2! is pivotally mounted on a pin secured between the sides or face plates 2 and 3 of the frame. Link 2| is of laminated construction and consists of two outer plates 4| and 42, between which is secured a central, thicker plate 23, the three laminations being held together in unitary form by means of the rivets 24 or other equivalent fastening elements. It willbe observed that the central lamination 23 is smaller than the outer plates ll and 42 so that these plates project beyond the end of the central lamination, thus providing a clevis portion 43 between which the arm The coil spring 33 tends to hold a shoulder 26,

provided adjacent to the wider end of the link 2|, against the end 21 of a T-shaped adjusting screw 29. The head 27 of said adjustingscrew 29 is guided in angular slots 3| formed in the face plates 2 and 3. A nut 30 is threaded on the adjusting screw and said nut 30 protrudes through openings in the face plates 2 and 3, as seen in Figs. 1 and 3. By manipulation of the nut 30 the of the back of the Wrench. This is especially noticeable in Fig. 1 where the edge 44 of the link 2| will be seen to be in substantial parallelism with the rear edges of the face plates 2 and 3 and projects beyond the same to a negligible amount quite insufficient to destroy the straight-line effect at the back of the wrench. It will be further noted that the angularity of the shoulder .26 on the link 2| is relatively slight so that this v adjustment of the movable jaw 21. positive one and adjusting screw 29 is moved up or down in the 7 slots 3| and its head 21, in constant contact with the shoulder 26 of the adjusting link 2|, determines the spacing of the face 9 of the movable jaw from the face 6 of the fixed jaw.

It will be seen from the structure described that when the actuating handle l5 is moved toward the fixed handle portion of the frame I, it will cause the movable jaw 8, through the arrangement of links disclosed, to swing toward the fixed jaw 4 to an extent determined by the head 21 of the adjusting screw against which the shoulder 26 of the adjusting link abuts. movable jaw will assume a position of parallelism to the fixed jaw when it reaches the limit of its inward swing and then, when pin l4 passes the over-center position, the parts will be locked in close clamping relation with any object to be grasped between the jaws. When releasing the object by swinging the handle l5 outwardly, or to the position shown in Fig. 2, it will be noted that the slots l3 permit the descent of the pivot pin l2 to the lower ends of these slots, and this descending movement of the pivot l2 under the swing of the handle l5, exerts a longitudinal pull on the links H, causing them to impart a swinging movement on the movable jaw, thus swinging said jaw about the pivot 22 to bring its gripping face 9 to the angular position shown in Fig. 2, and at once permitting the release of the object then located between the jaws.

, In the construction described it will be noted that the shape of the adjusting link 2| is such that a relatively small portion of it protrudes out The a easily secured.

While I have described one embodiment of the invention, it is obvious that the same is not to be restricted thereto but is broad enough to cover all structure coming within the scope of the annexed claim.

What we claim is:

In a tool of the character described, a frame having a fixed jaw, a movable jaw in the frame, a pair of companion links between which an end of the movable jaw is pivoted, an actuating handle having an end pivoted between the opposite end of the companion links, a pair of coupling links pivoted at one end to the frame and at the other end to the actuary handle, an adjusting link of triangulated shape having its narrower end clevissed to pivotally receive a part of the movable jaw, said adjusting link being pivoted at its wider end to the frame and having a shoulder near said wider and pivoted end, an adjusting screw mounted in the frame, and resilient means at the wider and pivoted end of the adjusting link and adjacent to the shoulder for holding said shoulder in contact with the adjusting screw.

VINCENT S. WARD. GORDON K. HURLBUT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,211,507 Lilleberg Aug. 13, 1940 2,388,580 Snell Nov. 6, 1945 2,420,020 Snell May 6, 1947 2,436,497 Snell Feb. 24, 948

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