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A self-contained, hand-actuated hydraulic clamping device is operated sequentially by using two sets of pistons with different piston areas in each set.
English (United States)
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100% of the total text.
Page 1 of 2
Hydraulic-Actuated Clamping Device
A self-contained, hand-actuated hydraulic clamping device is operated
sequentially by using two sets of pistons with different piston areas in each set.
Referring to Figs. 1 and 2, a base 1 has mounted thereon plate movable slide 4. The slides are positioned by hand over ball detents 5 in either a retracted
position or in an extended position over a workpiece 6, as shown in phantom Fig. 1. When the workpiece is to be clamped, a screw 7 is advanced into a manifold
8, forcing hydraulic fluid along ducts 9 to actuate the locking pistons 10 and
clamping pistons 11 at each of the slides.
In the sectional view of Fig. 2, there is shown a slide 4, a locking piston 10
and clamping piston 11. Piston 10, having a large tenon 12 and thus a small
surface area, moves upwardly rapidly as screw 7 (Fig. 1) is advanced to lock
slide 4 in the extended position. Clamping piston 11 having a larger piston area
than the locking piston moves upwardly more slowly but less distance to clamp
the underside of the workpiece 6 after the slide is locked. When releasing the
workpiece 6, clamping piston 11 lowers the workpiece before the locking piston
10 clears the slide to insure that workpiece 6 is below the slide surface before the
slide can be withdrawn.
Page 2 of 2
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