Work holders – Relatively movable jaws – Plural jaw pairs – angularly oriented – for common work
Patent
1977-05-31
1978-06-27
Spicer, Robert L.
Work holders
Relatively movable jaws
Plural jaw pairs, angularly oriented, for common work
269142, 269237, 425388, 425DIG48, B25B 514
Patent
active
040970353
ABSTRACT:
An adjustable clamping frame for clamping the peripheral edges of a sheet of plastic material during the plasticizing and vacuum forming thereof, such frame including a first pair of parallel side elements having clamping elements mounted thereon and being selectively adjustable toward and away from one another to vary the spacing therebetween, and a second pair of side elements selectively mountable in any of a plurality of facing slots spaced along the length of the first pair of side elements. Each of the second pair of side elements includes a pair of flat support bars slidable in the aforesaid slots to extend therebetween at each selected position of the first pair of side elements, and a plurality of clamping sub-assemblies selectively mounted in side-by-side relationship on these flat bars, with the clamping sub-assemblies having different predetermined lengths which provide, in selected combinations thereof, a total extending length corresponding generally to the spacing between the first pair of side elements. Preferably, each clamping sub-assembly has clamping elements mounted on a clamping plate that can be variably positioned with respect to the flat supporting bars in a direction perpendicular to the extending length thereof, whereby the positions of the clamping plates on the second pair of side elements can be varied by either relocating the flat bars thereof in the slots of the first pair of side elements or by repositioning the clamping plates with respect to the flat supporting bars.
REFERENCES:
patent: 2873653 (1959-02-01), Wilson
patent: 2907069 (1959-10-01), Butzko
patent: 3841819 (1974-10-01), Diamond
patent: 4039643 (1977-08-01), Dean et al.
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