GB563266A - Improvements in multiple boring or drilling machines - Google Patents

Abstract

563,266. Drilling-machines. JANES, E. R. June 11, 1943, No. 9462. [Class 83 (iii)] Work to be drilled, such as wooden panels or like parts used in the construction of ammunition boxes, have all the holes drilled simultaneously by a machine that employs a number of (normally) portable hand held power drills mounted between upper and lower plates of a box jig fed by treadle mechanism to the work. Other materials, such as compressed fibre, plastics, and non-ferrous metals, may be drilled. In the production of the jig plates, the lower plate 18, Fig. 2, is mounted above the upper 17 and drilled with holes of the required spacing by a combined drill 45 and counterbore 47 so that coaxial holes are produced, that 28 to receive a set-screw 29 to engage the handle of the power drill 22 and that 26 to receive the neck of the casing. The plates are connected by bolts 19 fitted with both spacing and clamping nuts and the lower plate is mounted on angle bars 30 fitted with brackets 31 eyed at 32 and 132 to slide on guide rods 33 carried by extensions 34 from the main work-supporting members. The plate 14 to be drilled is located by guide rails 13 on the main members and held by lugs 15. Feed is effected by a treadle 36 linked at 37 to blocks 38 on a cross-bar 39 to which are adjustably connected rods 40 attached to the lower eyes 32. Clamps 41 adjustable on the rods 33 support collars 141 and carry guides 142 for the brackets 31. Springs 42 are confined between the eyes 132 and fixed collars 141 and between the eves 32 'and the extensions 34, which with their connected parts are adjustable in slots 16 in the main frame. Flexible hoses or cables 24 supply pressure fluid or electricity to the individual drills. In a. modification, the angle bars 30 are carried by blocks sliding in guides in frames and provided with lugs connected to the rods 40. Springs are mounted on the rods between the lugs and the bases of the frames. Tension springs are mounted between the above lugs and further lugs at the tops of the frames. The frames are laterally adjustable on guide rails on the main frame and clamped by screws passing through the slots 16.