Patent GB-735357-A (GB)
Title: Improvements connected with securing in position a labyrinth strip
Inventor: DOWSE SIDNEY
IPC: B21C37/24
Filed: 1953-01-06
Abstract: 735,357. Jointing by forging. ARMSTRONG SIDDELEY MOTORS, Ltd. Dec. 23, 1953 [Jan. 6, 1953], No. 355/53. Classes 83 (2) and 83 (4). Making labyrinth packings.-A machine for securing a channel-shaped strip in an undercut groove of a component by means of a wire comprises a peening roller for engaging the wire in the channel strip when the latter is in the groove, means for vibrating the roller to provide a hammering effect on the wire and means for effecting a relative traversing movement between the roller and the component. The machine comprises a tool head unit 20 and a work-holding unit 21. The tool head unit includes a peening roller 23 carried by a ram 26 supported on resilient mountings 27 said ram being connected to a penumatic vibrator 25. The tool head unit is carried by a counterbalanced slide 30 which is itself mounted on an adjustable slide 34 on a supporting head 35. The slides are adjusted by means of a hand wheel 36 which rotates a screw-threaded shaft 40 co-operating with a nut 41 on the slide 34 which may be locked by a clamp 44. The slide 30 can be moved downwardly by an air cylinder 48 controlled by a foot-operated valve 49. Compressed air is delivered from a main pipe 50 to a pressureregulating valve 51 and thence to the vibrator 24 via a control valve 53. Compressed air is also supplied to a reducing valve 56 and to the foot valve 49 which selectively supplies the air pressure to either end of the cylinder 48 which is mounted on the slide 30. The work-holding unit includes a shaft 60 driven from a variable speed motor 61 one end of the shaft carrying a dog clutch 65 having a bearing for supporting one end of a shaft 66. A worm gear 67 on the shaft 66 meshes with a worm wheel 68 on which is mounted a jig 69 for holding the component 70. The shaft 66 can also be rotated by a hand wheel 71 for setting purposes. The clutch is actuated by a hand lever 74 located in its operative and inoperative positions by spring-pressed balls 80. The vibrator is actuated simultaneously with the engagement of the dog clutch by means of an arm 85 connected to the control valve 53 which can be coupled to the lever 74 by a spring-pressed plunger 86. In operation, the strip 91 is placed on the groove 92 beneath the roller 23 (Fig. 8) and a finger 93 on the slide 30 locates the strip in the groove. The slide 30 is then gently lowered by the hand lever 94 until the roller contacts the wire after which the pedal-actuated valve 49 is operated to hold the beginning of the wire and strip in the groove. The lever 74 and arm 85 are now operated to rotate the component 70 and actuate the vibrator. When the operation is completed the valve 49 is moved in the opposite direction to raise the tool-holding slide 30. The work-holding unit 21, may be adjusted longitudinally in guideways 105 by means of a screw-threaded shaft and nut operated by a handle 104 (Fig. 2). Indexing means for bringing the successive grooves in the component vertically under the roller 23 comprises a spring-loaded plunger 106 which can be engaged by one of a series of holes 107 on a plate 108 mounted behind the lever. The plate 108 has a peripheral guideway in which slides a block 110 the block being locked to the plate by a spring-loaded plunger 112 which engages in radial holes 111 on the plate. The block carries a plate 114 formed at its ends with recesses 115, 116 which form stops for the pin 106. For indexing, the plate 114 is slid around the plate 108 until the stop 115 engages the pin 106. It is then locked in position and the pin 106 is withdrawn and the handle 104 turned until the pin 106 engages the stop 116. If the strip is to be inserted in an internal groove of a pocket the roller may be carried by a J-Iike shank the air-cylinder then serving to raise the roller into contact with the wire.