| 摘要 |
<p>336,241. Kings Patent Agency, Ltd., (Gordon, J.). July 5, 1929. Drilling. - Work - positioning means for drilling- machines &c. comprise blocks adjustable along a scale and work-engaging stops movable transversely to the adjustment along inclined planes on the blocks so as to take up operative or inoperative positions. The blocks 1, Figs. 2 and 6, are adjustably clamped by screws 7 on a carrier rod 2 supported by brackets 5 on a channel-shaped base 3 in which the lower ends of the blocks slide. A scale may be provided on the front surface 4 of the base 3 or the rod 2 may be non-circular and provided with a scale as at Fig. 14. The work-engaging stops may consist of rollers 9 located in slots 11 in the blocks 1 and movable over inverted V-shaped floors 10 so as to project into the path of the work A or to be clear thereof. Central pins 12 on the rollers engage apertures 13 in the sides of the slots 11 to restrict the movements of the rollers and screwed pins 15, accessible from the sides of the blocks 1 or through holes 18 in the opposing sides, may be adjusted to confine the rollers to one side or the other of the blocks. A V-slot may also be provided on the pins 15 to locate the rollers in a central position. The rollers 9 may be moved into and out of position by hand or by cams 23, 24, on a shaft 25 operated through linkage from a lever or pedal. The stops may consist of nuts 9<1>, Fig. 2, adjustable along screwed sleeves 19, which are mounted in the blocks 1 in the same manner as the rollers 9. In another modification the floor of the slots 11 is flat and the rollers are guided by their pins 12 in the apertures 13 which are of inverted V-shape with a notch at the apex to locate the rollers in their central position. In a further modification the floor 10, Fig. 14, of the recesses 11 slopes in one direction only and the rollers 9 are maintained in the inoperative positions by projections 33 in the apertures 13 or transverse pins engaging the central pins 12. Alternatively, the work-engaging stops may consist of plungers 43, Fig. 20, slidable in inclined recesses 44 in the blocks 1 and prevented from falling out by projections 46 theron engaging pins in the sides of the recesses. The plungers are preferably square in section and the recesses circular to reduce friction, and the plungers are maintained in the inoperative positions by the back of the work A. Dust covers 48, Fig. 20 or 30, Fig. 6, are provided and more than one carrier rod may be used. In mortising the length or width of a mortise is determined by brackets 36, Fig. 4, on the work-table 37 and adjustable collars 39, 40 on a rod 35 attached to the machine frame 38, and for cutting mortises of different size on the same work-piece A, one or more pivoted catches 42 are provided on a second rod 34. Alternatively, the rods 34, 35 may be attached to the table 37 and the brackets 36 to the machine frame.</p> |
