Patent GB-913227-A (GB)
Title: Adjustable mounting for buffing wheels and the like
Inventor: THIEL OTTO
IPC: B24B47/04
Filed: 1960-03-24
Abstract: 913,227. Buffing. MIDWEST SUPPLY & MFG. CO. March 24, 1960, No. 10493/60; Class 60. A structure for the mounting of a buffing or like head for universal adjustment comprises a support, a first mounting member on the support, a second mounting member having means pivotally engaging the first mounting member for rotatively adjusting the second mounting member about a first axis, a third mounting member having means pivotally engaging the second mounting member for rotatively adjusting the third mounting member about a second axis in 90 degrees angular relation to the first axis, means to secure the second mounting member in a rotatively adjusted position on the first mounting member and the third mounting member in rotatively adjusted position on the second mounting member, comprising rods connected respectively to the first and second mounting members and to the second and third mounting members, the rods extending angularly relative to the respective first and second axes and having means to secure the same pivotally at the ends of the rods to the respective second and third mounting members on pivotal axes offset from and paralleling the first and second axes respectively and means to connect the head to the third mounting member. A buffing machine has a cross-beam 11 resting on upright pillars 12 and carrying a base-plate 13 which supports a housing 14. A tubular column 15 mounted for vertical sliding movement within the housing 14 has an external screw-thread meshing with an internal screw-thread on a worm-gear 19 meshing with a worm 25 which can be rotated by a wrench applied to the squared end of its shaft. A keyway 17 in the column 15 is engaged by a key 29 to prevent rotation of the column 15 and the inner end of a bolt 32 bears against the key 29 to secure the column 15 in vertically adjusted position. A cylindrical casing 21 is of sufficient length to receive the column 15 when the latter is fully elevated. A split sleeve 36 surrounding the lower end of column 15 and resting upon an end-plate 37 bolted to the bottom of the column has clamping bolts 39 so that it can be adjusted through 360 degrees about the axis of the column 15. The sleeve 36 carries a bracket 38 braced by arcuate ribs 41 and having at its lower end a tubular boss 42 with spaced coaxial bores pivotally receiving a stub shaft 44. Axial movement of the shaft 44 is prevented by restraining rings 45. The projecting end of the shaft 44 receives a hub 46 on an upright bracket 47 of a mounting plate 48. A further bracket 49 on the plate 48 receives a pin 50, parallel to the shaft 44, serving as a pivot for a threaded rod 52 threadedly received at its upper end in a swivel member 53 pivoted by a pin 54 on one of two enlarged bosses 38<SP>1</SP> integral with the bracket 38. The rod 52 carries two nuts 55 by which the plate 48 can be adjusted about the horizontal axis A-A of the shaft 44 and secured in the adjusted position. The plate 48 has a depending, preferably integral, pivot shaft 58 rotatively receiving the hub 59 of a bracket plate 60 rigidified by an integral rib 59<SP>1</SP>. A cap 61 on the end of the shaft 58 prevents axial movement of the hub 59. A threaded rod 62 has one end pivotally mounted by a pin 64 to one of two opposed ears 65 on the plate 60 and its other end extends through a swivel member 67 pivoted by a pin 68, parallel to the shaft 58, in a boss 69 at the outer end of the plate 48. The rod 66 carries two nuts by which the plate 60 can be adjusted about the vertical axis B-B of the shaft 58 and secured in the adjusted position. Plate 60 has a circular series of equallyspaced vertical holes 70 and the plate 48 has a set of arcuate openings 71, enabling further clamping in any desired position of angular adjustment. A slide plate 73 has a vertically elongated way 74 dovetailing into a vertically elongated way 75 in a portion 76 of the plate 60. A nut on the portion 76 is engaged by a screw 78 journalled in the slide plate 73 and having at its upper end a squared extremity 80 to receive a hand wrench for vertical adjustment of the plate 73. Alternatively, the screw 78 may have applied thereto a motor-actuated adapter as in Specification 913,226. The plate 73 supports an electric motor 82 for driving the buffing wheel W. A cradle 83 secured to the plate 73 is centrally apertured to receive the motor shaft 85 which is connected by belts 92 with the buffing wheel spindle 94 journalled in a hub 96 of a housing 97 rotatably mounted on a flanged portion 99 of the cradle 83. Set-screws 101 in lugs 100 on the housing 97 co-operate with abutment surfaces 102 of a bracket 86 secured to the cradle 83, whereby movement of the housing 97 is limited. An air cylinder device has an internal plunger 105 anchored by a join 105<SP>1</SP> to a boss 90 on a bracket 87 secured to the cradle 83 and an outer cylinder 106 connected at 107 to a bracket 108 on the housing 97. The air cylinder is controlled by valving to enable the buffing wheel W to be moved as desired during a buffing operation, e.g. to lift the wheel away from the work when indexing of the work is desired. A spring device for counterbalancing the weight of the housing 97, wheel W and associated parts or for applying pressure to urge the wheel against the work comprises a rod 111 pivotally connected by a pin 112 to a boss 89 on the bracket 87 and slidably received in a tube 113 containing a spring 114 acting on a sleeve 115 on the rod 111. The tube 113 is pivotally connected by a pin 116 to the bracket 108 on the housing 97. The bosses 89, 90 are each provided with a pair of openings 119 for selectively receiving the lower pivot connections 105<SP>1</SP>, 112, for the air cylinder and spring device. The housing 97 comprises a first part 122 pivoted on the cradle 83 and bracket 87 and a second part 121 slidably guided in extension 122<SP>1</SP> of the first part; a set-screw 120 acts between the two parts for tensioning the belts, the parts being locked in adjusted position by bolt and slot means 123. The cradle 83 has a circular series of equallyspaced holes 125 selectively and threadedly receiving bolts 126 applied to a similar series of holes in the flange 127 of the bracket 86. The bracket 87 is received by three bolts 128. Removal of the bolts permits the brackets 86, 87 to be swung as a unit with the associated air cylinder and spring devices about the axis of the motor 82 for a 360 degrees adjustment.