Patent GB-191228414-A (GB)
Title: Improvements in or relating to Hack-saw Machines.
Inventor: WICKSTEED CHARLES
IPC: B23D49/06
Filed: 1912-12-09
Granted: 1913-12-09
Abstract: 28,414. Wicksteed, C. Dec. 9. Reciprocating-saw machines. - Relates to a hack-saw machine adapted to cut in an horizontal, or nearly horizontal, plane. A worktable C is rotatably mounted preferably on ball bearings C<3> on a table B sliding on the machine bed. The tables C, B are actuated by worm gearing C<1>, C<2> and screw-and-nut gearing B<1>, B<3>, the operating-spindles being turned either by hand or through belt and change-speed gearing from a motor B<6>. The hack-saw machine G is mounted so as to slide transversely to the direction of movement of the table B in a slideway F<4> formed in a bracket F, which is pivoted to a bracket E adjusted vertically in guides A<2> on the machine bed by means of a screw E<3>. The hack-saw frame L is reciprocated by a crank-disk 0 and connecting-rod N on bars L<1> carried by a frame K, which is slidable horizontally on guide-bars K<1> carried by side frames G<5>. A spring K<3>, between a box K<2> on one of the frames G<5> and an abutment on the frame K, presses the frame horizontally, but when the saw is cutting, the feed of the work-table is adjusted so that no horizontal movement of the frame takes place. A pin, carried by the frame K and projecting through one of the frames G<5>, indicates any displacement of the frame K. The connecting-rod N engages a gudgeon pin L<3> on the saw-frame L and is prevented from moving with the saw frame transversely by guides N'. In order to keep the sawing-machine in the same position relatively to the cut, the machine frame is constantly pressed towards the work along the slideway F<4> by a spring H<1>, and is formed with a projection G' carrying a roller H adapted to engage with the work W. When not in action, the machine can be withdrawn by a handle G<4> and held stationary by a tripping catch G' engaging teeth F<6> on the bracket F. The bracket F is adjusted about its pivot F<2> so as to keep the direction of the stroke radial by a hand-operated worm F<5>. The crank-disk spindle O<2> is driven through toothed gearing from a motor P and carries an eccentric operating a pump such as described in Specifications 2121/09 and 3107/11 to relieve the saw on its return stroke. The movement of the pump piston is transmitted to the frame K through a rod Q<3>, crank Q<2>, shaft Q, crank Q<1>, and link Q<4>. In a modification, the inner bar K<1> is adjustable in slots in the frames G<5> so that the inclination of the frame K, and consequently the inclination of the saw cut, may be adjusted. In this case, instead of the spring K<3>, springs are arranged on each bar K<1> to feed the saw, and either a slotted connexion is arranged between the crank Q<1> and link Q<4> or the crank Q' is adjustable about the shaft Q. In a further modification, the bracket or table carrying the hack-saw machine is carried by a vertically-adjustable central stem which is rotated through worm gearing, the work remaining stationary. According to the Provisional Specification, pressure is applied to the guides carrying the saw frame by weighted bell-crank levers instead of springs.