Patent GB-862607-A (GB)
Title: Elevating and traversing mechanism for a grinding machine
Inventor: HAMMOND LEE C
IPC: B24B41/00
Filed: 1959-10-01
Abstract: 862,607. Grinding. HAMMOND MACHINERY BUILDERS Inc. Oct. 1, 1959, No. 33380/59. Class 60. A grinding machine comprises a grinding wheel 14, Fig. 2, a work-supporting table 13, elevating means 12, Fig. 4, for moving the table and grinding wheel vertically with respect to each other, a first handle 126, Fig. 2, for operating a traversing means to move the table horizontally relatively to the grinding wheel, a second handle 86 releasably engageable with a shaft 54, Fig. 3, connected with the elevating means, and a manually-operable. drum 72 connected through a second shaft 68 and reduction gearing 71, 66 to the shaft 54 whereby the elevating means can be moved a small distance relative to the peripheral movement of the drum 72 which is so spaced from the traversing handle 126 that the operator may conveniently have one hand on the latter handle whilst the other hand controls operation of the elevating means, by moving, with palm contact, the hand towards and away from the work 144. A third handle 138 operates a screwed shaft 131, Fig. 4, below the table to move it backward or forwards relative to the wheel, to position the work before cut. The table 13 is carried by anti-friction slideways 104, 98, Fig. 4, the latter being mounted on the head 33 of a vertically-movable member 28 which carries a central screwed vertical spindle 22 rotatable within a fixed nut portion 21 by the shaft 54 through bevel gears 37, 56 ; a helical spring 46 around the spindle 22 helps to support the weight of the table-carrying, column 26 and its head 33, this weight also being partially taken by the bevel gear 37 its bearing 43, and a ring 44. A casing 57, Fig. 3, houses the bevel reduction gears 66, 71 through which the shaft 54 is rotated manually by the drum 72 and shaft 68 ; a grub-screw 62 secures the casing angularly relative to the housing 49 of the elevating gear adjusting shaft 54, after suitable adjustment of the position of the drum 72 in relation to the traversing handle 126. The handle 86 is engagable with a heat-portion 76 secured to the front end of the shaft 54 by pulling the shaft forward to engage diametrically - opposed pins 89, 90 (not shown), having grooves formed longitudinally in an extension 79 of the hub portion 76; when in disengaged position, the pins are, free of the grooves. The verticallymovable column 26 is held against rotation by guide rollers 23, 24, which engage grooves 29, 30 in the wall of the column ; an extensible bellows 32 encloses the space between the head portion and the outer casing 16 of the machine to exclude grit &c. A scale 96 on the periphery of a flanged collar 93 permits the operator to check visually his manual operation of the elevating gear, a fixed pointer 97, Fig. 2, being provided on the gear casing 57 for co-operation with the scale, which is adjustably secured to the hub 76 by a set-screw 94. Traverse of the work-table 13 is effected by a pinion at the remote end of a shaft 119 on which the handle 126 is secured which engages with a rack carried below the table 13. Adjustable limit-stops are provided on the table which contact fixed stops 146, Fig. 4, at the limits of traverse.