Hydraulic hammer assembly
AssigneeRaymond International Inc.
InventorWilliam J. Swenson
Life of this patent
Estimating the term…
Abstract
A hydraulic hammer assembly is disclosed which comprises a stationary piston suspended within a tubular frame or casing and a cylinder locked inside a massive ram within the casing. The cylinder forms a differential hydraulic assembly with the piston and moves up and down along the piston. The cylinder is maintained locked to the ram by the pressure of the hydraulic fluid; and the piston, which is formed of two members, is held in assembly by a continuous hydraulic bias with a special hydraulic balancing arrangement which compensates for the pressure switching in the cylinder to which one portion of the piston assembly is exposed.
Claims31
A hydraulic hammer assembly comprising an outer casing, a central piston secured at one end to said casing, said piston having a large cross section region between regions of intermediate cross section and small cross section, a ram reciprocally moveable along said piston, said ram including a cylinder surrounding said piston and slideable therealong, said cylinder having a central internal region which closely accommodates said large cross section region of said piston and end regions which closely accommodate respectively, said regions of intermediate and small cross section of said piston said large cross section region of said piston thereby dividing said central internal region of said cylinder into two chambers of larger and smaller working area, respectively, an anvil mounted on said casing in the path of ram movement, hydraulic supply means including accumulator means for accommodating fluid flow while maintaining a substantially uniform high hydraulic pressure, said hydraulic supply means being in fluid communication with the chamber of small working area and hydraulic switching means being alternately connectable to said hydraulic supply means and to a drain, said hydraulic switching means being in fluid communication with the chamber of larger working area.
A hydraulic hammer assembly comprising an outer casing, a massive ram guided for reciprocal movement along said casing, an anvil positioned in said casing in the path of reciprocal ram movement to be hammered on by said ram, an actuating hydraulic piston and cylinder assembly including a piston rod extending out from a cylinder and secured to said casing, said cylinder fitting closely inside a cavity in said ram, said cylinder having elemental portions thereof which are moveable into tight contact with said ram upon application of high hydraulic pressure to the interior of said cylinder and hydraulic drive means connected to actuate said piston and cylinder assembly.
A hydraulic hammer assembly comprising an outer casing, a massive ram guided for reciprocal movement along said casing, an anvil positioned in said casing in the path of said ram to be hammered on by the lower end of the ram, said ram being formed with a longitudinal bore opening out onto its upper end, a hydraulic piston and cylinder assembly including a piston rod extending out from a cylinder, means securing said piston rod to said casing near its upper end, said piston and cylinder assembly being fitted into the longitudinal bore of said ram with said cylinder locked to said ram and hydraulic drive means to actuate said piston and cylinder assembly, said drive means having hydraulic conduits extending through said piston rod.
A hydraulic hammer assembly comprising an outer casing, a massive ram guided for reciprocal movement along said casing, an anvil positioned in said casing in the path of reciprocal ram movement to be hammered on by said ram, said ram being formed with a longitudinal bore opening out onto its upper end, a hydraulic piston and cylinder assembly comprising a central tubular cylinder member and upper and lower cylinder end members fitted into the ends of said tubular cylinder member, said end members being formed with central openings of different size, a piston rod comprising an elongated member attached at one end to said casing and extending down therefrom into said tubular cylinder member, said piston rod having a large diameter section which fits closely in but slides along the inner surface of said tubular cylinder member, said piston rod having upper and lower sections which fit closely into and slide along the different central openings, respectively, of said end members, said piston rod, said end members, said tubular cylinder member and said ram being relatively moveable a finite amount in the lateral direction so that upon subjecting said piston and cylinder assembly to high hydraulic pressure said members and said ram become automatically aligned.
Dependencies are inferred from the claim text.