Patent GB-190513686-A (GB)
Title: Improved Pipe Wrench and Shifting Spanner.
Inventor: CARROLL RICHARD MICHAEL
Filed: 1905-07-03
Granted: 1906-01-18
Abstract: 13,686. Carroll, R. M. July 3. Spanners and wrenches.-In a pipe wrench and shifting spanner, having means for quickly setting the jaws by means of a keep upon which the movable jaw is capable of oscillating, an adjustable slide piece serves to lock the keep and movable jaw in the position to which they have been adjusted. A metal frame 1 is shaped at its lower end to form a handle 2 and at one side of its upper end it is formed into a lower grip jaw 3. The upper grip jaw 6 projects at right-angles from a stem 5 which has rack teeth 9 upon its front edge, the lower end of stem being shaped to form a handle 8. The stem passes through the frame and the teeth upon it engage with corresponding teeth 11 in a metal keep 10 carried within a recess in the frame and curved to a radius struck from a point 12 near the middle of the frame, the recess being so shaped that the keep may oscillate therein when the handles are drawn together to grip an object. Within the frame and upon the back edge of the stem in a slidable bearing-piece 17, a part 24 of the back of which is curved to a radius struck from the point 12. A spring 18 within the frame normally tends to press the bearing-piece against the back of the stem, and a stud 22 projects through a slot 23 in the frame whereby the bearing-piece may be drawn down to permit free movement of the stem for adjusting the jaws. A rivet pin 15 passing through an arc-shaped slot 16 in the keep prevents it from being displaced while permitting a certain amount of radial movement. The slide piece fits at its upper end into a space 20 between the back of the stem and the frame and when in that position prevents the teeth 9 from coming out of engagement with the teeth 11. When the slide piece is in the position shown in Fig. 2, the teeth upon the stem may be moved out of engagement with the teeth upon the keep and so allow the stem to be moved through the frame to adjust the distance between the upper and lower jaws. A roughened surface 21 is provided upon the face of the stem below the teeth 9, for convenience in adjusting the tool by the thumb. Wire springs, on both sides of the keep, bear against the sides of the frame and prevent the keep from following the stem when the latter is being moved away. Figs. 7, 12, and 17 show various modifications. In Fig. 7 the keep is made with a back piece connected to a part 10 and which is formed in a circle struck from the point 12. The slide piece 17 fits in a recess 30 between the stem and back piece. Fig. 12 shows the stem 5 having a longitudinal slot 32 which receives a sided piece 33 working through the slot and having operating disks 35, one on each side, working in corresponding slots 37 in the frame. A bridgepiece connects the disks 35, and the slots 37 are so formed that when the disks are moved forwardly within them, the stem is moved and the teeth upon it engage with the teeth of the said keep and when moved rearwardly, the stem is drawn out of engagement with the teeth. In Fig. 17 the keep 10 has disk trunnions 45 fitting into corresponding circular holes in the frame of the tool.