Patent GB-704359-A (GB)
Title: Improvements relating to the manufacture of sand and like cores for metal casting operations
Inventor: SILCOCK STANLEY
IPC: B22C9/18
Filed: 1951-05-25
Abstract: 704,359. Grinding foundry-cores. STERLING METALS, Ltd. May 20, 1952 [May 25, 1951], No. 12373/51. Class 60 Apparatus for use in the sizing and rubbing down of sand and like cores for casting metals comprises a grinder 10, Fig. 1, having ganged grinding wheels 11 keyed to a common spindle 12 journalled at its ends in sleeves 13 mounted in carriages 15 ; portions of the sleeves 13 project beyond the carriages 15 to serve as handles 16 by which the grinder 10 may be manipulated. The carriages 15 have wheels 17 running on square sectioned rails 18 secured in uprights 21 integral with side members 24 of the machine frame. The bed comprises longitudinal bars 23 having integral therewith transverse webs 23a; metal strips 25 detachably secured to the upper surfaces of the bars 23 provide a worksupporting surface renewable when worn or damaged. Each carriage 15, Fig. 6, has a slotted bearing ring 39 which receives the inner end 13a of a grinder sleeve 13 and is clamped thereon by screws 43. The ring 39 has a rib 40 engaging grooves 38 in the side members 36 of the carriage. The ring 39 is vertically adjustable, a threaded hole therein being engaged by a screw-threaded part 49 of a spindle 47 to the top of which is keyed a head 51 secured by locknuts 52 ; the head 51 carries a scale 53 and has serrations 54 engaged by a manually releasable spring-loaded locking plunger device 55. The head 51 bears on the upper surface of a member 44 bridging the side members 36 ; a flange 48 on the spindle 47 bears against a flange 46 of a sleeve 45 screw-threaded into the bridge member 44. End play developing between the spindle 47 and head 51 is taken up by rotating the sleeve 45 which has a milled edge 56 engaged by a resilient finger 57. The grinding wheels 11, Fig. 4, have their end faces 58 normal to the axis of the spindle 12 and are clamped between collars 59 on the spindle 12, the ends of which are journalled in bearings 60 in the sleeves 13 ; a screw-threaded spigot 62 on one end of the spindle serves for connection to the driving shaft of a motor or a union sleeve of a motor-driven flexible driving shaft. To permit ready removal of the grinding wheels from the spindle for inspection and replacement, the end of the spindle remote from the spigot 62 is in screw-threaded engagement with a spindle extension 64 journalled within the sleeve 13. To remove the wheels, the spindle 12 is prevented from rotating by engaging a spanner with flats 65 thereon whereupon the sleeve 13 and extension 64 are locked together by suitable means and can then be unscrewed from the end 63 of the spindle to enable the collar 59 and the grinding wheels to be slidably disengaged from the spindle. In a modification, Fig. 8, the abutting end faces 66 of the grinding wheels 11 are inclined to the axis of the spindle 12. The end 69 of the spindle remote from the spigot 62 is integral with the main body of the spindle and is journalled in a bearing assembly 70 located in fixed axial position in the sleeve 13. The inner end 13a of the sleevesurrounds a boss 71 integral with a clamping collar 72 ; the outer end of the sleeve is closed by a screw-threaded end cap 73. A nut 74 on the end 69 of the spindle prevents axial displacement of the bearing assembly 70 relative to the spindle. To remove the wheels, the cap 73 is removed and then the nut 74 whereupon the sleeve 13 and bearing assembly 70 can be withdrawn bodily from the end 69 of the spindle, enabling its boss 71 and grinding wheels to be slidably disengaged from the spindle. A horizontal plate 75 carried by the uprights at one end of the apparatus serves as a sight gauge against which the grinding line of the grinding wheels 11 can be checked for level by the operator. Rests 76 secured to the uprights have depressions 77 to receive the handles 16 of the grinder 10 when the latter is not in use. The shape of the frame permits a jig and core for sizing and rubbing down to be moved in a straight line from a roller conveyer or the like on to the bed. A collector box for sand can be arranged below the bed, and a collecting cowl can be provided to receive sand particles thrown off by the grinder 10. A cowl 78 is provided above the grinder 10.