Counter-balancing mechanism

Details Counter-balancing mechanism Counter-balancing mechanism

2006-06-06

2006-06-06

Wood, Kimberly (Department: 3632)

Supports

Resilient support

Adjustable preloading of resilient means

C248S292110, C248S364000, C352S243000

Reexamination Certificate

active

07055791

ABSTRACT:
A counter-balancing mechanism is provided that includes a support for supporting an article to be tilted about a horizontal axis, and an annular cam movable with the support, wherein the cam has a cam surface which varies in height in a direction normal to the plane of rotation of the support. A cam follower is loaded by a resilient member, whereby, as the support rotates, the cam follower and resilient member cause a return force to be exerted on the cam surface to substantially counteract the torque caused by the rotation of the support. A reaction member for varying the return force in accordance with a load on the support is provided, wherein the cam is able to rotate about its own axis which is offset from the axis of rotation of the support, and wherein the reaction member includes a variable reaction point, against which the cam follower force reacts, at or offset from the axis of rotation of the support, thereby to cause the return force exerted due to rotation of the support about a particular angle to be varied.

REFERENCES:
patent: 4083524 (1978-04-01), O'Connor
patent: 4113215 (1978-09-01), Stapleton
patent: 4771979 (1988-09-01), Nakazawa et al.
patent: 4959671 (1990-09-01), Ishikawa
patent: 4989814 (1991-02-01), Uehara et al.
patent: 5419520 (1995-05-01), Ishikawa
patent: 5553821 (1996-09-01), Ishikawa
patent: 0 696 702 (1996-02-01), None
International Search Report of PCT/GB02/00529, dated May 2, 2002.
International Preliminary Examination Report of PCT/GB02/00529, dated May 9, 2003.

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