Patent GB-473497-A (GB)
Title: Improvements in combination routing, sawing and like machine tools
IPC: B23Q37/00
Filed: 1936-05-25
Abstract: 473,497. Combined routing, sawing, &c. machines. WALKER-TURNER CO., Inc. May 25, 1936, No. 14772. Convention date, Nov. 16, 1935. [Class 83 (iii)] [Also in Group XXIII] A convertible machine tool for routing, sawing, &c. comprises a base 10 carrying a work table 12 over which extends an arm 23, the free end of which is adapted to receive the various tooling attachments. The work table is gapped at 17 and pivots about horizontal axis in the table surface. A housing 14 contains mechanism for driving a reciprocating file, saw or other tool ; a crank 18 being driven from a motor.19 and belt gearing and operating a plunger 15 carrying a chuck 16. The housing 14 closed by a cover plate 14b and bottom plate 14c contains lubricant for the gearing, and oil scraped from the plunger falls into a cup 14d and drains back into the housing. A bellows 14e is fitted between the oil cup and the end of the plunger. An extension of the housing has an arcuate seating for a slotted member 12b on which the table is angularly adjustable and secured by a bolt 12a. The table may also be slightly tilted in a plane transverse to its normal direction of tilt by means of a screw 12f. The rear part of the base has a machined surface 21 carrying an overarm 23 fitted with interchangeable tool heads such as a routing head H or a jig-saw head S. The tool head is spigoted to the arm at 26 and secured by a bolt 28 in an angular position which is indicated by a dial 31. The router head comprises a sleeve 33 axially fed in a bracket 34 by rack-and-pinion gearing from a hand wheel 42, a depth gauge and stop mechanism 45 and a clamping lever 44 being provided. A spiral spring is fitted between the pinion shaft and the bracket 34 to counterbalance the head. The sleeve has antifriction bearings for a routing spindle 37 driven 'through a resilient coupling 47 from a coaxial motor 46 whose casing is secured to the sleeve 50. The overarm may be swung about the vertical axis of a screw 55 and clamped by means of a bolt 56 engaging an arcuate slot 57 in the base. A second bolt hole in the arm may be employed to give an additional range of angular adjustment. In a modification, the router head may be fed by means of a cable operated from a treadle. For sawing operations such as the cutting to size of a printing plate, the head H is provided with a combined presser foot and saw guide roller 68 which may be swung into position beneath the routing-spindle to coact with a saw blade mounted in the chuck 16. A guide fence 69 is provided for guiding the work past the tool. The presser foot may be swung to the position shown in Fig. 1 when not required. For jig-saw work the head H is replaced by the head S, Fig. 6, carrying a hollow plunger 70 fitted with a chuck 71 for holding the upper end of the saw blade. The plunger is normally retracted to tension the saw by a spring 72 whose upper abutment 72a may be adjusted by means of a series of holes 70a in the plunger to maintain a constant spring tension for blades of different lengths. The casing 34a may be angularly adjusted to set the saw to predetermined positions and fine adjustments may be made by rotating the chucks and clamping them by upper and lower nuts 71a and 16a respectively. A work holddown 67 and saw guide 68 are mounted on an extensible rod 80 clamped to the head. A leather washer 76 acts as a piston in the cylinder 7 so that on the down strokes air is directed through a hole 78 to remove chips &c. from the work.