Lockable piston-cylinder assembly

摘要

A piston rod is connected to a piston and extends through a seal in the end face of a cylinder. A locking tube which surrounds the cylinder when the piston rod is retracted has a first end section mounted to the free end of the piston rod so that the locking tube is pivotable between a release position, wherein the locking tube is substantially coaxial to the piston rod, and a locking position, wherein the locking tube is inclined toward the piston rod. An opposed second end section has a supporting stop which can be positioned axially against the free end of the cylinder when the piston rod is extended and the locking tube is in the locking position. An actuable retaining device retains the locking tube in the locking position only by manually pivoting the locking tube into the locking position when the piston rod is extended.

主权项

1. A lockable piston-cylinder assembly comprising:
a cylinder having an end face; a piston guided movably in the cylinder; a piston rod connected to the piston and extending through a seal in the end face of the cylinder, the piston rod having an axis and a free end outside the cylinder, the piston rod being movable through the free end between a retracted position and an extended position; a locking tube having a first end section and an opposed second end section, the locking tube surrounding the cylinder when the piston rod is in the retracted position; the first end section being pivotably mounted to the free end of the piston rod so that the locking tube is pivotable between a release position, wherein the locking tube is substantially coaxial to the piston rod, and a locking position, wherein the locking tube is inclined to the axis of the piston rod; the second end section having a supporting stop which can be positioned axially against an end face of the cylinder when the piston rod is extended and the locking tube is pivoted into the locking position; and a latching device for retaining the locking tube in the locking position, the latching device comprising a pair of resilient clip aims having a respective pair of clips spaced apart by less than a diameter of the cylinder, each of said pair of clips deflecting against a spring force normal to the axis of the piston rod when the locking tube is manually pivoted from the release position into the locking position when the piston rod is extended and engaging the cylinder when the locking tube is pivoted from the release position to the locking position; wherein the resilient clip arms are fixed to the second end section of the locking tube at an actuating area opposite from said respective pair of clips, the clip arms are connected to one another by said actuating area, and transitional areas from the clip arms to the actuating area are stiffened by longitudinal webs of the locking tube such that said respective pair of clips are spreadable apart by pressing said actuating area radially toward said cylinder.