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Patent Searching and Data


Title:
AN ELEVATOR BUFFER
Document Type and Number:
WIPO Patent Application WO/2011/131986
Kind Code:
A3
Abstract:
A buffer (10) comprises a casing (11) defining a hollow container for hydraulic fluid; a hollow, hydraulic fluid reservoir adjacent to the container; a displacement member (18) extending between the exterior of the buffer and the interior of the reservoir via a first aperture (19) in the reservoir; and a spring (16) acting between the displacement member and the remainder of the buffer (10). The displacement member (18) is moveable inside the reservoir between a first position in which the displacement member (18) is relatively extended on the exterior of the casing (11); and a second position in which the displacement member (19) is relatively retracted, inside the reservoir, the spring (16) urging the displacement member (18) towards the first position. The reservoir includes one or more further apertures (28) via which on movement of the displacement member (18) from the first position to the second position hydraulic fluid flows from the reservoir to the container in a manner damping movement of the displacement member (18).

Inventors:
WILLIAMS TERENCE DAVID (GB)
NG CHEE HONG (GB)
STROUD EDWARD CHARLES (GB)
Application Number:
PCT/GB2011/050787
Publication Date:
March 29, 2012
Filing Date:
April 20, 2011
Export Citation:
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Assignee:
T A SAVERY AND CO LTD (GB)
WILLIAMS TERENCE DAVID (GB)
NG CHEE HONG (GB)
STROUD EDWARD CHARLES (GB)
International Classes:
B66B5/28
Domestic Patent References:
WO2001089974A12001-11-29
Foreign References:
US4015835A1977-04-05
GB2143613A1985-02-13
US1870827A1932-08-09
US5050712A1991-09-24
US4174098A1979-11-13
US3731770A1973-05-08
Attorney, Agent or Firm:
POWELL, Timothy (Park View House58 The Ropewalk,Nottingham, Nottinghamshire NG1 5DD, GB)
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