Patent GB-259196-A (GB)
Title: Improvement in forging machines
IPC: B21K5/06
Filed: 1926-09-13
Abstract: 259,196. Sullivan Machinery Co., (Assignees of Wineman, W. H.). Sept. 29, 1925, [Convention date]. Sharpening rock drills; forging- machines. - A forging-machine more especially for sharpening rock drills has vice jaws for clamping the work, means for applying clamping pressure to the jaws, and a device interposed between the pressure means and the jaws and movable from an inoperative to an operative position to bring the vice jaws near together, and when in such operative position forming a pressure transmitting device between the pressure applying means and the jaws. One jaw 10 is carried by a fixed support 12, and the other jaw 9 and its support 8 are carried by a frame 5 pivoted on a shaft 4. A bar 46 extending between ears 47 on the arm 6 of the frame 5 is connected by right-hand threads to a rod 45 connected by left hand threads to a member 42 jointed at 44 to a toggle link 40 pivoted at 43 to a plate 36 actuated by a flexible diaphragm 35. The joint 44 of the toggle is connected by links 59 to the lower end of a plunger 53 in a cylinder 50. Admission of air to this cylinder straightens the toggle and moves the clamping jaw 9 into a position in close relation with the stationary jaw 10, this position being adjustable by turning the head 48 of the screw 45. Actuation of the straightened toggle by the pneumatic diaphragm 35 then effects the clamping movement of the jaw 9. The admission of air to the cylinder 50, diaphragm 35 and horizontal upsetting hammer 28 is controlled by a cylindrical valve 68. Fig. 5, in a housing 65 with chamber 66 supplied by a pipe 76. Passages 84, 85 admit air to a pipe 55 connected to the cylinder 50, passages 81, 82, 83 connect with the space behind the diaphragm, whilst the hammer 28 is supplied through a chamber 79 and pipe 80. Full movement of the valve operating lever 73 is prevented by the projecting end 116 of a rod 110 connected to the pivoted arm 6, until the straightening of the toggle has moved this rod from the dotted to the full line position shown in Fig. 3, thereby preventing actuation of the hammer 28 until the work has been clamped. When the pneumatic pressure is released the plunger 53 is returned to its initial position to break the toggle 40, 45 by means of springs 60. A vertical swaging-hammer 26 for operating on work between the dies 24, 25 may be actuated at any time by depressing a pedal 104 controlling a valve 103 admitting air from a pipe 100, gauging mechanism for this work being provided comprising a fixed die 13 and movable die 15 carried on the pivoted frame 5. Means other than pneumtic may be employed for effecting the first positioning movement of the clamping jaws. or the final clamping movement, or both. For example, in the modification shown in Fig. 6, the toggle 40, 45 is straightened by the action of a foot lever 120 connected by a pin and slot 121 to a link 59<a> jointed to the toggle; the clamping pressure is then applied by the pneumatic diaphragm and plate 36 as before, air being admitted thereto by a supply pipe 123 and valve 124 the stem 125 of which is actuated by a lateral movement of the foot lever 120 permitted by a lateral notch at the bottom of a vertical guiding slot. In another modification the diaphragm may be replaced by an ordinary piston. In a further modification the toggle link 40 is pivotally connected to a wedge actuated to produce the final clamping movement by a solenoid or air cylinder, or manually. Cleaning work.-A nozzle is provided in one of the fluid pipes for cleaning the bores of the drills.