Document Type and Number:
Japanese Patent JPS5627733
Kind Code:
B2
Abstract:
A hollow housing is provided with a rod which is slidably mounted within the housing. A tightly wound coil spring is positioned on the rod so that the inner diameter of the coil is in close contact with the periphery of the rod. An unlocking lever and a bushing are fixed relative to the housing, on either side of the coil spring, in such a manner that the rod may be slidably moved therethrough. The spring is fastened to the bushing and is located so as to unwind when the unlocking lever is actuated. When the lever is not actuated, movement of the rod in the direction from the lever toward the bushing may be prohibited by providing an angularly oriented surface on the bushing. When the rod is pushed, the spring will be reoriented from its natural angle of coiling to the angle on the bushing surface, tightly gripping the rod and preventing its movement. On the opposite side of the unlocking lever, a second coil spring may be tightly wound upon the rod in the opposite direction of coiling from the first spring. One end of the second spring may be fixed relative to a similar second bushing fixed in the housing. When the unlocking lever is rotated about the axis of the rod, it acts against the adjacent ends of the first and second springs to unwind the springs slightly, enlarging their inner diameters. The springs release their grip from the rod, allowing it to slide freely in either direction. The second bushing may be provided with a spring abutment face which is either perpendicular to the axis of the rod, causing the spring to act only as a friction drag when the rod is pushed, or may be angularly related thereto, causing the spring to act as a lock against rod movement in that direction. A third bushing having a spring abutment face which is perpendicular to the axis of the rod may be fixed within the housing in a similar fashion and a third spring fastened thereto. The opposite end of the third spring may be disengaged from all structure. The third spring and bushing will create a friction drag force on the rod which will prevent sudden relative movement between the rod and housing in either direction, whether or not the unlocking lever is actuated.
Application Number:
JP3496573A
Publication Date:
June 26, 1981
Filing Date:
March 27, 1973
Export Citation:
International Classes:
A47C1/027; B60N2/23; F16B7/14; F16D49/04