| 摘要 |
358,002. Brake linings. FORD MOTOR CO., Ltd., 88, Regent Street, London. June 25, 1930, No. 19394. Convention date, Aug. 10, 1929. [Class 103 (i).] A method of attaching the lining to brake shoes or other brake members consists in clamping the brake member and the lining against a die shaped to correspond with that of the drum or other member with which the lining is to engage and securing the lining while so clamped. The lining is thus caused to fit closely to the brake member and the necessity for grinding the surface of the lining after attachment is avoided. A machine is described by which a brake shoe and lining may be forced against a cylindrical die under high hydraulic pressure and be then drilled and riveted. A cylinder 12 has attached to it a cylindrical die 15 to receive the brake lining and is pierced with an upper and a lower row of holes 22 corresponding to the rivet holes 20, Fig. 5, on either side of the web 17 of a T-section brake shoe. A plunger 13 working in the cylinder 12 has an arcuate slot 21 to receive the web 17. A series of anvils 23 for clinching the rivets are radially slidable into and out of position in the plunger 13 by links connecting them to a crank 25 on a shaft having a handle 27. A fixed piston 29 is arranged in a bore in the plunger 13. Brackets 38, 39 swingably mounted on trunnions 37 and a hydraulic plunger 36 carry respectively a riveting head 43 and an electric drill head 50. The head 43 has a piston 45 carrying a riveting shaft 48. The head 50 can be reciprocated by a rack-and-pinion and hand-lever 51. The hydraulic system comprises low, high and medium pressure pumps 55, 56, 57, driven by a motor 53, each with a relief valve 72, 73, 59 set at the desired pressure. In operation, the valve 77 is first set at position R so that pump 55 supplies through pipe 79 to the space between the piston 29 and the plunger 13 which is thus retracted to enable the brake shoe and lining to be fitted to the plunger and the die 15. The valve 77 is then moved to position 1 so that both pumps 55, 56 supply at the low pressure through pipe 80 to the cylinder 12 and by the channel 33 to the space between piston 29 and plunger 13 which is thus rapidly advanced to the outer position shown. The valve is then moved to position 2 for a short time so that only the high pressure pump 56 supplies to the pipe 80. The valve 62 being in the position shown so that the plunger 36 is in the lower position, the lower row of rivet holes are countersunk by swinging the bracket 39 and rivet head 50 into position adjacent the openings 22. The valve 62 is then positioned so that the pump 57 supplies to the cylinder of the plunger 36 which lifts the drill and riveting heads 50, 43 to permit first the drilling and then the riveting operation for the upper row of rivets. The plunger 36 is then lowered for fixing the lower row of rivets. The riveting operation is effected by supplying liquid from the pump 57 alternately to one side and the other of the piston 45 by the valve 65. |
