Patent ID: 6257813
Filing Date: 2001-07-10
Classification: B23P,B25B,F16B

Abstract:
An automatic screw clamping device comprising:a tubular casing;a rotator disposed in said tubular casing, said rotator is movable in a vertical direction of an axis of the screw clamping device, said rotator having an engaging portion formed at a lower end of said rotator, whereby said rotator is unrotatably engaged with a clamped member;a biasing member for biasing said clamped member, wherein said biasing member is connected with said rotator at one end thereof, and with said tubular casing at the other end, wherein said tubular casing and said rotator provides a biasing force, and wherein said rotator and said tubular casing become rotatable relative to each other when a turning force is applied;locking means provided on said tubular casing and said rotator wherein said tubular casing and said rotator may removably be locked to each other, whereby said rotator remains in said tubular casing in a biased positioned to hold a given turning force, said locking means providing a lock joint between said tubular casing and said rotator and said lock joint being removed as said rotator is urged upwardly relative to said tubular casing; andfitting means for joining said tubular casing and a mount member with said clamped member attached thereto in an unrotatable manner, so that said fitting means may permit said tubular casing to rotate under the influence of said biasing force of said biasing member applied to said tubular casing, and upon such rotation, said tubular casing and said mount member being unrotatably joined together, whereby said rotator in an engaged relationship with said clamped member may bias said clamped member in a direction when said rotator is being tighten.