US 2021/0180747 A1 · ROD FIXING DEVICE, AND TELESCOPIC ROD UNIT EMPLOYING SAME

Abstract

[Problem] To provide a rod fixing device capable of operating with substantially the same magnitude of force irrespective of whether the direction of movement of a rod is up or down, and a telescopic rod unit employing the same. [Solution] A locking mechanism 13 which moves integrally with a first rod 11 inside a second rod 12 comprises a stopper 15 having a contacting surface portion 15c capable of coming into contact with an inner circumferential surface 12a of the second rod 12, a holder 14 which rotatably holds the stopper 15 in such a way that the contacting surface portion 15c is capable of coming into contact with the inner circumferential surface 12a of the second rod 12, and a coil spring 16 which normally imparts to the stopper 15 an elastic force for generating a fixing frictional force between the first rod 11 and the second rod 12 by causing the contacting surface portion 15c of the stopper 15 to come into contact with the inner circumferential surface 12a of the second rod 12, wherein the configuration is such that movement of the first rod 11 toward one side causes the contacting surface portion 15c to rotate toward a side separating from the inner circumferential surface 12a of the second rod 12, and movement of the first rod 11 toward the other side is a movement against the fixing frictional force.

Claims9

Dependent claims

A rod fixing device suppressing a rod from unexpectedly moving, comprising:

a first rod;
a cylindrical second rod into which the first rod is inserted and which holds the first rod such that the first rod can be reciprocally moved in axial directions;
and
a locking mechanism which moves together with the first rod in the axial directions in the second rod, wherein
the locking mechanism includes
at least one stopper having a contacting surface portion capable of coming into contact with an inner circumferential surface of the second rod,
a holder which is arranged in the second rod such that the holder can be moved together with the first rod and which rotatably holds the stopper in such a way that the contacting surface portion is capable of coming into contact with the inner circumferential surface of the second rod, and
an elastic member which gives to the stopper an elastic force for generating a fixing frictional force between the first rod and the second rod by causing the contacting surface portion of the stopper to come into contact with the inner circumferential surface of the second rod,
the stopper, when the first rod moves to one side in the axial directions, is rotated such that the contacting surface portion comes away from the inner circumferential surface of the second rod and, when the first rod moves to the other side in the axial directions, is moved against the fixing frictional force.

6 more elements

Dependencies are inferred from the claim text.

Rod fixing device, and telescopic rod unit employing same

Life of this patent

Rod fixing device, and telescopic rod unit employing same

Life of this patent

Abstract

Claims9