Work holders – With fluid means – Cylinder-piston means in series with additional positioning...
Patent
1977-08-31
1979-11-20
Watson, Robert C.
Work holders
With fluid means
Cylinder-piston means in series with additional positioning...
269 20, 269 94, 269157, 269241, B23Q 700
Patent
active
041748280
ABSTRACT:
Apparatus for clamping a workpiece or workpiece fixture in a machine tool comprising pin-type clamping elements which are insertable into the work table and engage with locking elements mounted therein. More specifically, the table has a surface adapted to support a workpiece or fixture which includes a plurality of openings and removable covers thereon to prevent chips and other debris from collecting in the openings and to prevent the loss of pneumatic pressure in machine tables of the air float type. The clamping apparatus comprises a hydraulically actuated piston mounted within the table having a central bore with means for releasably retaining one end of a locking pin. The locking pin is adapted to be inserted into the bore and in one embodiment is provided with high pitch threads which are engageable with mating threads in the piston bore. In another embodiment, the pin is dimensioned to be inserted through the piston bore and then locked to the piston by means of lugs which are brought into locking engagement with the piston by a quarter turn of the pin. A clamp bar may be secured to the top of the pin by a threaded nut and suspended between a support block and the workpiece or fixture so that when the piston is actuated, the clamping bar will be drawn toward the table as the pin is retracted and by this means will exert downward clamping pressure on the workpiece or fixture. A plurality of similar hydraulic pistons may be distributed throughout the table so that clamping pins may be inserted at a variety of positions thereby enabling clamping pressure to be applied to the workpiece or fixture at any point desired.
REFERENCES:
patent: 2421957 (1947-06-01), Mead
patent: 2428111 (1947-09-01), Eldrup
patent: 3055654 (1962-09-01), Harrison et al.
patent: 3209623 (1965-10-01), Schardt
Hoffman John F.
Jeffers Albert L.
Watson Robert C.
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