| 摘要 |
A counterbalance apparatus (10) for moving the work surface (100B) of a work station (100) is described. Preferably, the apparatus includes first and inn er tubular members (12 and 20), a spring (70) and a cam follower (50). The firs t member is mounted to the panel (100A) adjacent the work station. The inner member is mounted with the top end (20A) adjacent the underside of the work surface and the bottom end (20B) extending into the top end (12A) of the fir st member. The sidewalls (12C and 20C) of the first and inner members have firs t and inner cam grooves (16 and 26), respectively. A dampener (30) is preferab ly mounted within the inner member. A threaded rod (36) is mounted on the top e nd (32A) of the body (32) of the dampener and has an adjustment head (36B) whic h extends through the work surface. The cam follower having rollers (56 and 58 ) is mounted at the bottom end (34A) of the piston rod (34) of the dampener su ch that the rollers extend into the first and inner cam grooves, respectively. The spring is mounted between the cam follower and an adjustment nut (44) around the threaded rod. During movement of the work surface, the inner memb er moves in and out of the first member to compress and expand the spring. The cam rollers move along the cam grooves and allow for a constant force on the work station throughout the movement of the work station.
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