Patent GB-942040-A (GB)
Title: Automatic multiple spindle drilling machine
IPC: B23B39/16
Filed: 1961-03-21
Abstract: 942,040. Drilling machine details. KEARNEY & TRECKER CORPORATION. March 21, 1961 [Oct. 31, 1960], No. 10239/61. Heading B3B and B3C. A multi spindle drilling machine comprises a bed 20, Figs. 1, 2, 3, a work-table 68 slidable on ways 64, 65 and a drill head 27 movable in a direction normal to that of table 68, on ways 22, 23, by means of a screw and nut mechanism actuated by a motor driven variable speed transmission 29. The tool spindles 34 are rotatably carried by laterally adjustable guides 36-45 slidably mounted in head 27 and are driven from a motor 54 through a variable speed transmission 55. Each spindle 34 is rotatably journalled in a guide e.g. 36, Figs. 2, 3, by sleeve bearings 103, 104, and is held against a thrust bearing 105 by lock nuts 106. The drive from transmission 55 is through universal joints 114, 110 and a telescoping splined shaft 112. Guide 36 extends through a slot 47 in head 27, and is clamped against face 119 of the slot by hydraulically actuated clamps 128, 129, which pass through an elongated slot 122 in guide 36. Clamp 128 which is laterally fixed in head 27 has a clamping head 131 which is urged against a face 124 of guide 36 to clamp the latter by belleville washers 141, and is released by an hydraulic cylinder 144 whose piston rod 145 engages a bolt 139 in the clamp 128. Laterally movable clamp 129 is carried by a slotted bridge clamp 150, Figs. 3, 4, and a bearing 153 on the clamp engages a further slot 154 in a web 137 of head 27. A further bearing 160 on the clamp engages a slot 161 in a second bridge clamp 162 which is axially movable on pins 173, 174, and has screwed thereto, a slotted plate 163. Bearing 160 is retained in slot 161 by a sleeve 177, washer 178, and nut 179 secured to the end of clamp 129. Slots 151, 154, 161, 180 are aligned so that with clamps 128, 129, released, guide 36 can be adjusted radially relative to fixed clamp 128, and can be pivoted about clamp 128 with clamp 129 moved transversely in the aforesaid slots. Bridge clamp 150 is moved in a direction to engage a collar 149 on clamp 129 and thus clamp guide 36, by belleville washers 182, 183, and is released by hydraulic cylinders 193, 194. Each of the guides 36-45 has a fixed clamp and a movable clamp the latter having a common set of bridge clamps for guides 35, 36, 37, and 38, 39, and 40, 41, 42, and 43, 44, each actuated by a pair of hydraulic cylinders, and a separate hydraulic cylinder for each of the fixed clamps. In operation considering guides 45, 36, 37 only, with a drill 239 in each spindle a pump 247, Fig. 5, driven by a motor 248 draws fluid from a sump 249 and supplies it to the left hand end of cylinders 211, 144, 212, 193, 192 via solenoid operated valves 257-260, to allow belleville washers 213, 141, 214, 182, 183, to expand and actuate clamps 203, 209, 128, 129, 204, 210 to clamp the guides. In order to adjust guides 36- 45 to their required positions, solenoids 277- 280 are energized to move valve spools 283, 289, 293, 294 to the right and reverse the fluid flow to the cylinders. The belleville washers are compressed, to release the guides which are then adjusted and re-clamped.