초록 ▼

A power tool in the form of a fluid pressure cylinder utilizing multiple movable pistons coupled for contemporaneous pressure-responsive working movement, as well as for return to no-load position. Individual pressure buildup on each pressure chamber is controlled by pre-selected imput and exhaust o

A power tool in the form of a fluid pressure cylinder utilizing multiple movable pistons coupled for contemporaneous pressure-responsive working movement, as well as for return to no-load position. Individual pressure buildup on each pressure chamber is controlled by pre-selected imput and exhaust orifice sizes for each chamber, which also permit better control of lubricant dispersal to the successively more remote chambers.

대표청구항 ▼

In a multi-piston pneumatic power tool for blind riveting and the like, the combination of a cylinder body, a plurality of baffle elements mounted in said body in axially-spaced relationship to partition said cylinder into a plurality of separate chambers, a piston slidably mounted in each chamber f

In a multi-piston pneumatic power tool for blind riveting and the like, the combination of a cylinder body, a plurality of baffle elements mounted in said body in axially-spaced relationship to partition said cylinder into a plurality of separate chambers, a piston slidably mounted in each chamber for pressure-responsive movement in said cylinder, spacer elements engaging said pistons to maintain them in axially-spaced relationship to each other, a tubular longitudinally-extending stem traversing said pistons for presenting a work-engaging member at the forward end thereof, means for securing said stem for contemporaneous axial movement with said pistons, said spacer elements providing a manifold fluid passageway for said chambers, a second fluid passageway provided by each piston between said manifold passageway and one of said chambers, selective valve means for supplying compressed air to said manifold passageway and said chambers to one side of said pistons to displace said pistons to retract said stem, piston-advancing means for restoring said stem to its initial position after retraction thereof, and means for supplying air suction to the opposite side of the piston in a portion of at least one of said chambers during pressure-induced retraction of said stem to increase the pressure differential on the piston.