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US3840314A Expired / Lapsed US ⏱️ 0.0 years remaining

Improved multi-story press with simultaneously opening and closing stories

Assignee: Motala Verkstad AB
•
Filing: 1971-10-12
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Granted: 1974-10-08
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Expires: 1991-10-12
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Abstract

Abstract A multi-story press is described which is provided with means for closing and opening the story openings simultaneously or simultaneously in groups, and in which the arrangement is provided with means for preventing the arrangement from being overloaded during the pressing operation and to counteract the influence of the weight of the press plates on the surface pressure in the press. The invention is characterized in that the aforesaid means is provided with members, each of which includes a cylinder and a piston rod which are axially movable in relation to each other, and a frictional arrangement acting therebetween and having a number of friction rings the one or two end surfaces of which are conically countersunk in shape and having a corresponding number of thrust washer plates positioned between the friction rings and two end plates positioned outside the outer friction rings, the one or both end surface of the plates being provided with crowns, which cooperate with the conical end surfaces of the friction rings so that the friction rings are urged towards the cylinder, alternatively are urged in towards the piston rod, when the friction arrangement is compressed longitudinally, and by an arrangement for causing in said members a suitable axial force between the cylinder and one end plate and the friction arrangement, alternatively between the piston rod and the end plate, so that the friction arrangement is compressed against an abutment surface for its other end plate on the piston rod, alternatively against an abutment surface for the second end plate in the cylinder.

Inventors

  • 👤 N Book

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 10:24
CPC Classifications
B; B30; B30B; B30B7/00; B30B7/02

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 212 words
A multi-story press comprising a stationary press plate, a plurality of movable press plates, means for selectively moving said plurality of movable press plates when closing and opening said press relative to said stationary press plate, said moving means each including relative to said stationary press plate, said moving means each including a cylinder and a piston rod which are axially movable in relation to each other, said moving means including overloading and counteracting means formed by a plurality of yieldable frictional elements disposed between said cylinder and said piston rod and in external telescopic relationship to said piston rod, a first of said friction elements being a number of friction rings each having axial end surfaces which are conically countersunk in shape, a second of said friction elements being a plurality of thrust washers each having axial end surfaces complementary contoured to and seated against an associated one of the end surfaces of the friction rings, a third group of said friction elements being two end plates positioned axially outboard of the outermost friction rings with at least one end surface of each having a surface complementary to and seated within and against the conical end surface of the outer friction rings, and means for forcibly axially compressing the friction elements.
Claim 2
Dependent Claim 212 words
A multi-story press comprising a stationary press plate, a plurality of movable press plates, means for selectively moving said plurality of movable press plates when closing and opening said press relative to said stationary press plate, said moving means each including relative to said stationary press plate, said moving means each including a cylinder and a piston rod which are axially movable in relation to each other, said moving means including overloading and counteracting means formed by a plurality of yieldable frictional elements disposed between said cylinder and said piston rod and in external telescopic relationship to said piston rod, a first of said friction elements being a number of friction rings each having axial end surfaces which are conically countersunk in shape, a second of said friction elements being a plurality of thrust washers each having axial end surfaces complementary contoured to and seated against an associated one of the end surfaces of the friction rings, a third group of said friction elements being two end plates positioned axially outboard of the outermost friction rings with at least one end surface of each having a surface complementary to and seated within and against the conical end surface of the outer friction rings, and means for forcibly axially compressing the friction elements.
Claim 3
Dependent Claim 25 words
The press of claim 1 wherein said compressing means is a piston in external telescopic axially movable relationship to said rod internally of said cylinder.
Claim 4
Dependent Claim 68 words
The press of claim 1 wherein said compressing means is a piston in external telescopic axially movable relationship to said rod internally of said cylinder and means for applying hydraulic pressure to move said piston toward one of said end plates with means operative to restrain movement of the other of said end plates thereby compressing said friction elements to hold said rod immovable relative to said cylinder.
Claim 5
Dependent Claim 38 words
The press of claim 3 including a second hydraulic pressure actuated piston in axial relationship to said restraining means, and means for applying hydraulic pressure to said second piston to move said second piston toward said restraining means.
Claim 6
Dependent Claim 28 words
The press of claim 4 wherein means are provided for adjusting said hydraulic pressure so that different pressures can be set during different periods of the pressing operation.
Claim 7
Dependent Claim 36 words
The press of claim 4 wherein said overloading and counteracting means are provided with means permitting continued hydraulic leakage through said friction elements whereby the interior of said cylinder is continually filled with fluid under pressure.
Claim 8
Dependent Claim 22 words
The press of claim 4 wherein at least one of said pistons has means for permitting the bleeding of hydraulic fluid therethrough.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-10-07 1978-04-08 1978-10-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-10-07 1982-04-08 1982-10-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-10-07 1986-04-08 1986-10-08 $7700.00 Window Closed / Lapsed

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