Patent GB-951050-A (GB)
Title: An independently driven chain mortising machine
IPC: B27F5/06
Filed: 1959-08-06
Abstract: 951,050. Mortising. C. RUSHTON. Nov. 4, 1960 [Aug. 6, 1959], No. 26832/59. Heading B5L. A chain mortising machine comprises a carriage for a mortising chain, means supporting the carriage for traversing movement of the chain with respect to a workpiece, means for effecting movement of the carriage to cause the chain to traverse the workpiece, and driving means for the chain including a chain, belt or shaft which is not movable bodily with the carriage in a vertical plane and a driven member movable with the carriage and engaging the chain, belt or shaft and traversing it longitudinally during such movement so as to be driven thereby. The mortising chain y, Figs. 2, 11, 12, is mounted on a carrier a which is vertically adjustable on tubes a<SP>1</SP>, a<SP>2</SP> or other pillars by a handle v and the weight of the carrier and chain is balanced by springs, or by a single or double counterweight x connected to the carrier by wires w<SP>1</SP>, w<SP>2</SP> or by a counterweight on the handle. A shaft k at the base of the frame is driven by flat or V-belts or through a friction or hydraulic clutch and a sprocket j on this shaft drives a chain h which passes over idler sprockets p and r, the latter being mounted on a pivoted spring-loaded arm q for tensioning of the chain. A pair of rollers or sprockets on arms u pivoted to a bracket u<SP>2</SP> adjustable on the carrier press the chain into engagement with a sprocket g on a shaft e by which the mortising chain y is driven. A belt and pulleys may replace the chain and sprockets. The work is clamped between a fixed but adjustable plate z<SP>14</SP> and an adjustable plate  z <SP>23</SP>. In the modification of Fig. 22, the drive from the shaft K to the mortising chain is by means of bevel gearing, the gear K<SP>11</SP> being slidable on a splined, keywayed or flatted shaft K<SP>7</SP>. Reversing means or worm reduction gearing in the initial drive may be provided. The modification of Figs. 29, 34 also employs bevel gearing but the vertical splined shaft K<SP>7</SP> and the sliding bevel gear K<SP>11</SP> are enclosed in a slotted tube A<SP>2</SP> and the horizontal sprocket shaft E is enclosed in a tube A<SP>3</SP>. The carrier A is vertically adjustable by the handle v<SP>1</SP> which has a pinion S<SP>8</SP> engaging a rack S<SP>6</SP> formed on or fitted to the tube A<SP>2</SP> and, for rapid adjustment of the carrier, the handle and sprocket can be moved sideways against the action of a spring so that the sprocket is clear of the rack. The handle may act through spur or epicyclic reversing gears. A clamp L<SP>11</SP> secures the carrier in adjusted position. In a further modification, Fig. 46, the weight of the vertically adjustable parts is balanced by a spring L<SP>10</SP> and the handle v<SP>1</SP> is pivoted to the top of the tube A<SP>2</SP> and connected by a pair of links v<SP>2</SP> to the carrier A. In yet a further modification, the carrier is vertically adjustable in a frame by a capstan handle and a pinion engaging a rack on the carrier. The frame may be traversable on the base by screw and nut means so that the mortising chain can be traversed along a stationary workpiece.