Patent GB-770504-A (GB)
Title: Machine for inserting the core of resilient bushings
IPC: B25B27/28
Filed: 1955-05-04
Abstract: 770,504. Assembling resilient mountings. GENERAL TIRE & RUBBER CO. May 4, 1955 [May 11, 1954], No. 12952/55. Class 108(3). A machine for assembling a tubular rubber insert A under radial compression between a rigid outer sleeve B and a tubular rigid core C, comprises an axially-movable plunger 38 havibg a core-receiving end-portion 40 of reduced diameter, and a tapered pilot-portion 60, means for supporting a sleeve B with an insert A therein in the path of the plunger 38, actuating means for advancing the plunger to move the pilot portion 60 to a position where the core C is within the insert A, and means timed with respect to the advancing movement of the plunger 38 for subjecting the interior of the insert A to fluid pressure. The insert A is thus expanded during the passage of the pilot 60 through, and entry of the core into, the insert A. The plunger is rigid with a cross head 39, Fig. 10, slidable on a slide 3, under the action of a connecting rod 43 coupled to a crankshaft, Fig. 1 (not shown). The crankshaft is connected by a one-revolution clutch to a belt-driven flywheel, Fig. 1 (not shown). The one-revolution clutch is controlled by a tripping lever 46, Fig. 10, controlled by solenoid 59. The plunger 38 is slidable within a bore 12 formed in a press member 2, which is reciprocable on the slide 3 under the action of a double-acting fluid pressure cylinder 4, Fig. 10. Each sleeve B is adapted to be supported at its respective ends by a sleeve supporting member 33, and a sleeve seat 32. The member 33 is carried by a pair of pistons 34 which work in respective pneumatic cylinders 35 in the member 2. Pressure in the cylinders 35 tends to urge the member 33 to the right (as shown in Fig. 5) into a sleeve engaging position. The seat 32 is formed on a sleeveclamping member 5, carried by a piston 20 which is outwardly urged by fluid pressure in a cylinder 6. Movement of the member 5 inwardly of the cylinder 6 against the fluid pressure, is also guided by a portion 19 which engages a cylindrical surface 18 carried by a head 16 of the cylinder 6. The member 5 is formed with an insert receiving seat 10 and with a funnel guide 9. A tubular insert engaging plunger 11 is mounted with provision for axial adjustment relative to the cylinder head 16. A bore within the plunger 38 is connected by a flexible pipe 65 and a valve 74, Fig. 10, with a source of fluid pressure. The plunger bore is connected by passages 67, 67, Fig. 8, with a radial channel 64 between the pilot portion 60 and the core receiving portion 40. Operation. On closing a switch 77, Fig. 10, a solenoid 73 is energized to result in the operation of a valve 68 to reverse the supply of pressure fluid from a line 69, from the pipe 70 connected to the forward end, to the pipe 71 connected to the rearward end, of the cylinder 4. The solenoid 73 also closes a switch 78 which has a holding action on the circuit of the solenoid 73, being connected back to the mains through a further switch 79 which is normally closed. Reversal of pressure in the cylinder 4 causes the press member 2 to be advanced towards the member 5. The member 33 is driven into engagement with the sleeve B and is retracted into engagement with the member 2. A stop 37 engages with the member 5 so that the latter is driven to the right against the air pressure in the cylinder 6. This causes the plunger 11 to engage the insert A and project it through the funnel 9 into position within the sleeve B. A stop 80 on the member 2 is adapted to engage a member which closes a switch 81, thereby energizing the solenoid 59 to operate the one revolution clutch. The plunger 38 is thereby forwardly projected to engage the core C previously inserted via a slot 13 within the bore 12. A stop 82 carried by the cross head 39 is adapted to engage a member 86 which closes a switch 87 in the circuit of a solenoid 75 which actuates the valve 74 controlling the supply of pressure fluid to the bore within the plunger 38. The solenoid 75 also causes a holding switch 88 to be closed, thus maintaining the circuit to the solenoid 75 through the switch 79. On further movement of the cross head 39, the stop 82 engages a member 89 which causes the switch 79 to be opened. This de-energizes the solenoid 73 and causes retraction of the member 2. The solenoid 75 is also de-energized on opening of the switch 79 and supply of pressure fluid to the pilot 60 is thus cut off. The switch 87 and its associated member 86 are mounted on the slide 3 with provision at 91 for axial adjustment. The switch 79 and operating member 89 are similarly mounted on the member 3 for axial adjustment at 90 independently of the adjustment of the switch 87. On the return movement of the crosshead 39, the stop 82 is retractable against the action of the spring 85 as it passes the members 86 and 89. Reference has been directed by the Comptroller to Specification 660,626.