Patent GB-686617-A (GB)
Title: Machine for grinding or honing the side walls of split piston rings
IPC: B24B7/16
Filed: 1950-08-23
Abstract: 686,617. Grinding piston rings. HOWLETT, J. W., and WELLWORTHY PISTON RINGS, Ltd. Aug. 1, 1951 [Aug. 23, 1950], No. 20878/50. Class 60. [Also in Group XXX] In a machine for grinding or honing the side walls of split piston rings comprising a pair of grinding or honing wheels arranged horizontally, with their axes vertically, one above the other with a gap therebetween through which the rings are continuously fed to grind or hone both side walls simultaneously, guide means being provided for guiding the rings between the wheels substantially diametrically there- .across, the rings being fed edgewise into the gap between the wheels by feeding means which advance them along a horizontal table, the rings to be machined are stored in a magazine having means adapted to engage with the gaps in the rings to orientate them in a direction such that the rings successively removed from the magazine by the feeding means will be fed to the gap between the wheels with the gaps in the rings at the trailing side of the ring. The machine base 1 carries a pedestal 2 for the feed table 3 and a support 4 for grinding or honing wheels 5, 6 carried on vertical spindles 7, 8 belt driven in opposite directions by electric motors. The upper wheel 5 is vertically adjustable by a hand wheel through worm drive and rack and pinion gearing. A stack of rings 15 to be ground is held in a magazine, vertically mounted on the feed table 3, comprising a V-shaped member 13 and a T- shaped member 14; the member 13 is to the forward side of the ring and the member 14 is at the trailing side of the ring with the web portion 16 fitting within the gap 17 of the ring. The member 14 is carried on an angle bracket 18 secured, by bolt 20 passing through slot 21 to permit horizontal adjustment, to a bridge 19 spanning the feed table 3 and secured thereto. The member 13 is secured to a bridge 24 by bolts 25 passing through a slot 26 in the bridge to permit vertical adjustment of the member 13 by an adjusting screw 27 threaded through a lug 28 on the member 13 and abutting a face 29 on the bridge 24; the gap 30 between the bottom of member 13 and the top of the feed table 3 is adjusted to be greater than the thickness of one ring but less than the thickness of two rings. The forward feeding of the rings 15 is effected by an endless belt 31 trained around driving pulleys 32, 33 on shafts 34, 35 carried in bearings in supports 36, 37 for the feed table 3, the supports being carried on a platform 38 on a tubular support 39 slidable vertically within the pedestal 2. An electric motor 40 carried by the support 39 drives the conveyer belt 31 through worm box 43, Vee belts 47 and pulley 46 on shaft 34. The rings 15 are fed by the belt 31 along the table 3 to a pair of feed rollers 48, 49; at least the top roller has a resilient surface and the rollers are pressed together and positively advance the rings in succession. The lower roller 49 is chain driven from the shaft 34; the shaft 34 also drives through chain 55 a lay shaft 57 which through toothed gearing drives the upper roller 48- The rings are guided through the machine by guide channels constituted by metal guide strips 65, 66. At the right hand end of the machine the strips are secured, by nut and bolt connections 68, to brackets 67 carried on stud bolts 69 having securing nuts 70 and engaged by threaded portions 72, 73 of opposite hand of a lead screw 71 rotatable by knurled wheel 74 to adjust the distance apart of the strips according to the diameter of the rings. The strips 65, 66 are similarly mounted at the left hand end of the machine, adjustment being effected by handwheel 80. The strips are tensioned by tightening bolts 81 carried on the brackets 67. The tops of the channels are formed by removable members 84, 85, 86 carried on bridge members 87, 88, 89 and vertically adjustable therein by threaded rods fitted with adjusting hand nuts 90, 91, 92. To bring the surface of the feed table 3 exactly level with the surface of the lower wheel 6, the tubular support 39 is vertically adjusted by a ring nut 98 mounted on a threaded pillar 100 carried on the machine base; the nut 98 is rotated through bevel wheels 101, 103 by a shaft 104 provided with flats 106 for receiving a turning handle. The member 39 is locked in adjusted position by a threaded bolt 107 having a handle 108. An outlet table 64 is supported on a bracket 110 secured to the end wall of support 4 by bolts 111, 112 carried in the wall and extending through vertical slots 113, 114 in the bracket; an adjusting bolt 115 having a handle 116 is carried in a bracket 117 on support 4 and engages bracket 110 to effect vertical adjustment thereof when nuts 111, 112 have been slackened.