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US 4,732,490 AGranted
Anti-friction element
OwnerCamillo Masciarelliinventor
Life of this patent
Estimating the term…
Abstract
Ball element for use in material handling equipment in which a rotatable ball is movable by a pneumatic piston from a first to a second position relative to a friction surface.
Claims4
Anti-friction element for use in a table or the like having a work surface, comprising:
- (a) a main body having a tubular wall defining a bore,
- (b) a flange extending radially outwardly from the wall to rest on the table work surface, the flange having a friction surface spaced above the said work surface,
- (c) a piston slidable in the bore, the piston carrying a ball which is rotatable in a cavity in the piston, the piston being movable from a first position in which the ball lies substantially entirely within the bore below the said friction surface of the flange to a second position in which the ball protrudes from the bore above the said friction surface,
- (d) means for introducing fluid under pressure to the bore in order to move the piston and to carry the ball to the said second position, and
- (e) means located in the bore to bias the piston to normally maintain the piston and the ball in the said first position.
2 more elements
Dependencies are inferred from the claim text.