Extension/retraction device

摘要

An extension/retraction device includes a cylindrical stationary leg section having a base at the upper end thereof, a cylindrical movable leg section in which the stationary leg section is fitted so as to be slidable in the longitudinal direction, an engagement tube having an upper end formed in a stepped shape and installed in the stationary leg section so as to be coaxial with the movable leg section and so as to be pivotable about the cylinder axis of the movable leg section, a pressing spring installed within both the movable leg section and the stationary leg section, a pulling spring held within the pressing spring, a guide tube having an upper end affixed to the base and installed in the engagement tube, an engagement section fitted to the lower end of the engagement tube, and a spacer installed between the lower end of the guide tube and the engagement tube.

主权项

1. An extension/retraction device for a tripod comprising:
a cylindrical movable leg section; a spiral length adjustment member which is located parallel to a longitudinal direction of the movable leg section; an engagement section formed to be able to be engaged with the length adjustment member; an engagement tube on which the engagement section is affixed so as not to be movable and which is to be fitted in the movable leg section so as to be slidable in a longitudinal direction; an extension/retraction member, which is installed in parallel with the length adjustment member in the movable leg section, for biasing the engagement tube in a direction of separating from the movable leg section; a stationary leg section in which at least a part of the extension/retraction member and the engagement tube are held and which is fitted in the movable leg section so as to be slidable in a longitudinal direction; and a guide member for guiding the stationary leg section so as not to be pivotable and so as to be slidable with respect to the movable leg section, wherein the engagement tube is installed so as to be pivotable about a cylinder axis of the movable leg section, wherein the length adjustment member has one end affixed to the movable leg section and the other end installed in the engagement tube so as to be freely slidable in a longitudinal direction, wherein the engagement section is installed so as to penetrate a space of the length adjustment member while pivoting or so as to be removed from a space while pivoting in conjunction with relative pivoting of the movable leg section and the engagement tube, and wherein an end of the engagement tube is supported by the stationary leg section so as to be pivotable.