The present invention relates generally to new and useful improvements in tools of the wrench or plier type.
The primary object of the invention is to provide, in a tool of the type including a pair of opposed jaws, novel means for automatically adjusting and actuating said jaws.
Other objects of the invention are to provide a tool of the aforementioned character which will be comparatively simple in construction, strong, durable, highly efficient and reliable in use, compact, light in weight and which may be manufactured at low cost.
All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein: Figure 1 is a view in side elevation of a tool constructed in accordance with the present invention, showing the jaws open.
Figure 2 is a top plan view of the device.
Figure 3 is a detail view in perspective of the attached plate.
Figure 4 is a detail view in perspective of the moveable jaw operating wedge.
Figures 5 and 6 are detail perspective views of the toggle links.
80 Referring now to the drawings in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a handle or lever I of suitable metal. Formed integrally with the forward end of the handle I and projecting substantially at right angles thereto is a plate 2.
Projecting forwardly from the free end portion of the plate 2 is a stationary jaw 3.
The reference numeral 4 designates a metallic plate which is secured, as at 5, on one side of the plate 2 in spaced, opposed relation thereto. The plates 2 and 4 have formed therein guide slots 6.
Journalled between the upper forward corner portions of the plates 2 and 4 is a roller 7, the Spurpose of which will be presently set forth.
Thereference numeral 8 designates a handle or lever of suitable metal comprising an angularly extending forward portion 9 operable between the plates 2 and 4 and terminating, at its forward end, in a moveable jaw 10. The jaw 10 is, of course, moveable toward and away from the stationary jaw 3. Headed elements II project from the sides of the portion 9 of the jaw 8 and travel in the guide slots 6.
The reference numeral 12 designates generally a toggle which is mounted between the handles I and 8 and connected thereto for actuation thereby. The toggle 12 comprises links 13 and 14 which are pivotally connected at one end, said links having their outer ends pivotally connected to the handles I and 8, as at 15. The reference numeral 16 designates a wedge which is pivotally connected at one end, as at I7, to the pivotal joint between the toggle links 13 and 14. The wedge 16 is operable between the roller 7 and. the inner end portion of the jaw 10 for moving said jaw 10 toward the stationary jaw 3 when the handles I and 8 are swung toward each other.
The forward edges of the plates 2 and 4 have formed therein notches 18 for the reception of wire to be cut. Wire engaged in the notches 18 is sheared by the edge portion 19 of the handle 8.
It is thought that the operation of the tool will be readily apparent from a consideration of the foregoing. When the handles I and 8 are swung inwardly or toward each other the toggle 12 drives the wedge 16 forwardly beneath the roller 7 in a manner to move the jaw 10 toward the jaw 3. During this operation the headed elements 11 travel in the guide slots 6. The construction and arrangement is such that the jaws readily adjust themselves as may be necessary and great leverage is had whereby said jaws will be caused to tightly grip an object therebetween. Of course, when the handles I and 8 are swung away from 2 each other the wedge 16 is retracted by the toggle 12 and the jaws 10 and 3 are permitted to open.
It is believed that the many advantages of a tool constructed in accordance with the present invention will be readily understood and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.
What is claimed is: A tool of the class described comprising a pair of plates spaced apart and having longitudinally extending slots therein, a handle having one end rigidly connected with one end of the plates, the handle extending rearwardly, a jaw connected to the other end of the plates and extending forwardly, a member including a handle part, a jaw part and a sloping part between the handle part and the jaw part, said sloping part extending between the plates, projections on the sloping part extending through the slots in the plates, a roller located between the plates and at that end with which the first- 60 mentioned handle is connected, a wedge member for engaging the roller and an edge portion of the sloping part of the member for forcing the jaw of said member toward the first-mentioned jaw and a pair of links having their forward 85 ends pivotally connected to the rear end of the wedge member, and their other ends pivoted one to the first-mentioned handle member and the other to the second handle member.
LAWRENCE A. SLAUGHTERBACK.