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US 4,304,540 AGranted
Hydraulic press
OwnerCarl K. Hammoninventor
Life of this patent
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OwnerCarl K. Hammoninventor
Estimating the term…
A hydraulic press includes long stroke piston cylinder assemblies to drive a movable platen along four pull down power rods between an upper open position and a lower reference position immediately adjacent to and parallel with the stationary platen, a wedge ring clamp mechanism selectively to lock the movable platen to the four pull down power rods at either the upper or lower reference positions, and short stroke piston cylinder assemblies operative reciprocally axially to drive the four pull down power rods when the upper platen is locked thereon to move said locked upper platen between said reference position and a closed position in which the two platens are loaded under high forming pressure. The short stroke piston cylinder assemblies are controlled for simultaneous but also independently adjustable movements to maintain parallelism between the upper and lower platens and also to maintain force and velocity control over the upper platen during the short stroke movement of the upper platen between the reference position and the closed forming position. The movable platen is centered and guided in its movements by adjustable wedge guide mechanisms on the movable platen cooperating with wear plates on the press frame.
A press comprising:
The press of claim 7 wherein said control means further includes an encoder carried by said movable and fixed platens continuously to monitor parallelism, velocity and force therebetween and also includes a computer operative to receive signals from the encoder as to parallelism, velocity and force and to then control the valves by interrelating the signals received to a predetermined standard to make hydraulic fluid flow adjustments, if necessary, to maintain the desired parallelism, velocity and force levels.
A hydraulic press comprising a frame, a fixed platen secured to said frame, a plurality of power rods mounted on said frame for selective movement relative thereto, a movable platen selectively traveling along said power rods and being guided by said frame between open, reference and closed positions relative to said fixed platen, clamp means selectively to lock said movable platen to said power rods, said clamp means including a wedge ring at each power rod selectively operative to cam segment means into locking engagement with their respective rods and positively to maintain such lock, until mechanical release, by the cam surfaces being inclined at self locking angles, and hydraulic means sequentially to drive said movable platen along said power rods between said open position and said reference position and to then drive said power rods and the movable platen clamped thereto between said reference position and said closed position.
Dependencies are inferred from the claim text.