GB973873A - Fluid operable piston and cylinder units for lifting apparatus - Google Patents

Fluid operable piston and cylinder units for lifting apparatus

Info

Publication number
GB973873A
GB973873A GB1204562A GB1204562A GB973873A GB 973873 A GB973873 A GB 973873A GB 1204562 A GB1204562 A GB 1204562A GB 1204562 A GB1204562 A GB 1204562A GB 973873 A GB973873 A GB 973873A
Authority
GB
United Kingdom
Prior art keywords
piston
fluid
cylinder
stem
lifting apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1204562A
Inventor
Horace John Parkinson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
Joseph Lucas Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lucas Industries Ltd, Joseph Lucas Industries Ltd filed Critical Lucas Industries Ltd
Priority to GB1204562A priority Critical patent/GB973873A/en
Publication of GB973873A publication Critical patent/GB973873A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B66F3/25—Constructional features
    • B66F3/42—Constructional features with self-contained pumps, e.g. actuated by hand

Abstract

973,873. Fluid operable lifting apparatus. JOSEPH LUCAS (INDUSTRIES) Ltd. March 21, 1963 [March 29, 1962], No. 12045/62. Heading B8J. In a fluid-operable piston and cylinder unit for lifting apparatus, fluid can flow to and from a cylinder 1 by way of a port 3 and a pipe 4. The port is divided into three coaxial portions of different diameters. A flanged and stepped plug 5 has a spigot-like stem 5a which is surrounded by the skirt of a hollow piston 7. The plug also has an axial passage 6 which communicates with radial passages in the stem 5a. An annular seating 5b at the end of the stem is adapted to close a central hole 7a in the piston 7 and a compression spring 8 normally urges the piston 7 away from the stem seating 5b. In use, fluid can flow to or from the cylinder 1 under control of a valve (not shown). However, should the pressure in the cylinder exceed the pressure in the pipe 4 by more than a predetermined amount, due, for example to a pipe failure or to the piston 2 descending at excessive speed under load, the piston 7 will close against the seating 5b and prevent or permit only slow escape of fluid from the lower end of the cylinder.
GB1204562A 1962-03-29 1962-03-29 Fluid operable piston and cylinder units for lifting apparatus Expired GB973873A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1204562A GB973873A (en) 1962-03-29 1962-03-29 Fluid operable piston and cylinder units for lifting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1204562A GB973873A (en) 1962-03-29 1962-03-29 Fluid operable piston and cylinder units for lifting apparatus

Publications (1)

Publication Number Publication Date
GB973873A true GB973873A (en) 1964-10-28

Family

ID=9997439

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1204562A Expired GB973873A (en) 1962-03-29 1962-03-29 Fluid operable piston and cylinder units for lifting apparatus

Country Status (1)

Country Link
GB (1) GB973873A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991659A (en) * 1973-12-06 1976-11-16 Robinson Morris D Fail safe apparatus for load lifts

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991659A (en) * 1973-12-06 1976-11-16 Robinson Morris D Fail safe apparatus for load lifts

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