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公开(公告)号：EP0724696A1
公开(公告)日：1996-08-07
申请号：EP94928972.0
申请日：1994-10-12
CPC分类号： B60G11/15 , F16F1/127 , F16L3/2053
摘要： A force applying device such as a spring supporting device comprises a helical compression spring (1) located within a cylindrical housing (3), the device being designed to support a load (8) through a rod (5). In use, the load (8) will move vertically between a high position and a low position, involving compression and extension of the spring (1). One end of the spring is provided with a pair of diametrically projecting trunnions (9), which are located within a pair of diametrically opposed cam tracks (11) provided in the cylinder wall. During initial downward movement of the load, the trunnions engage with the cam track (11), tending to 'wind up' the spring, providing an upward force acting on the trunnions. During final movement, movement of the trunnions within the cam track allows the spring to 'unwind', and thus some of the work required to be performed during this axial movement of the load produces a downward force compensating the increase in spring reaction. In this manner, by selection of a cam track of appropriate shape, a substantially constant force may be produced acting against the load throughout the range of movement of the spring.
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公开(公告)号：EP0724696B1
公开(公告)日：1999-03-24
申请号：EP94928972.2
申请日：1994-10-12
CPC分类号： B60G11/15 , F16F1/127 , F16L3/2053
摘要： A force applying device such as a spring supporting device comprises a helical compression spring (1) located within a cylindrical housing (3), the device being designed to support a load (8) through a rod (5). In use, the load (8) will move vertically between a high position and a low position, involving compression and extension of the spring (1). One end of the spring is provided with a pair of diametrically projecting trunnions (9), which are located within a pair of diametrically opposed cam tracks (11) provided in the cylinder wall. During initial downward movement of the load, the trunnions engage with the cam track (11), tending to "wind up" the spring, providing an upward force acting on the trunnions. During final movement, movement of the trunnions within the cam track allows the spring to "unwind", and thus some of the work required to be performed during this axial movement of the load produces a downward force compensating the increase in spring reaction. In this manner, by selection of a cam track of appropriate shape, a substantially constant force may be produced acting against the load throughout the range of movement of the spring.
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