Heavy load support mechanism and heavy load loading apparatus using the mechanism
AssigneeNisca Corporation
InventorTatsuzo Aoyagi
Life of this patent
Estimating the term…
Abstract
In supporting a heavy load with a spring member disposed between a fixed frame and a support frame, provided are a follower member that transfers a spring force of the spring member to the support frame, first and second cam surfaces that regulate motion of the follower member, and a biasing device for bringing the follower member into press-contact with the cam surfaces, the first cam surface generates a friction force to reduce an effect of the heavy load, the second cam surface generates a friction force to reduce an effect of the spring force, and the follower member is made movable in an expansion/contraction direction of the spring, and also in a direction crossing the expansion/contraction direction to control engagement of the follower member and the cam surfaces.
Claims11
A heavy load support mechanism for supporting a heavy load, comprising:
- a fixed frame;
- a support frame disposed to relatively approach and separate from the fixed frame;
- a spring member disposed between the fixed frame and the support frame to expand and contract in a shift direction of the support frame;
- a follower member disposed movably in a direction crossing an expansion or contraction direction of the spring member to transfer a spring force of the spring member to the support frame;
- a cam member for adjusting increase or decrease of action of the spring force exerted on the support frame from the spring member, having a first cam surface and a second cam surface to be press-contacted with the follower;
- and
- a biasing member for press-contacting the follower member with the the first cam surface and the second cam surface, including a biasing cam disposed on a free end of the spring member and having a biasing cam surface separately formed from the first cam surface and the second cam surface, the biasing cam surface being engaged with the follower member and applying a biasing force in the direction crossing the expansion or contraction direction to the follower member through the spring force of the spring member,
- wherein the first cam surface and the second cam surface balance weight of the heavy load and the spring force of the spring member acting on the follower member, the first cam surface is engaged with the follower member so as to generate a friction force to reduce the weight of the heavy load exerted on the follower member, and the second cam surface is engaged with the follower member so as to generate a friction force to reduce the spring force exerted on the follower member,
- the follower member shifts in the expansion or contraction direction of the spring member and concurrently in the direction crossing the expansion or contraction direction along the first and second cam surfaces through the spring force of the spring member, a biasing force of the biasing member and the weight of the heavy load.
Dependencies are inferred from the claim text.