초록 ▼

A telescopic pipe arrangement for use in situations where neither end can be rotated to change the length. An inner nut on an inner pipe bears against an end of an outer pipe and an outer nut either locks against the inner nut to enable inward or outward movement or locks against the outer pipe to l

A telescopic pipe arrangement for use in situations where neither end can be rotated to change the length. An inner nut on an inner pipe bears against an end of an outer pipe and an outer nut either locks against the inner nut to enable inward or outward movement or locks against the outer pipe to lock the arrangement.

대표청구항 ▼

A telescopic pipe arrangement, comprising: a first pipe having two axially opposite ends and a longitudinal bore having an inner peripheral wall; a second pipe having two axially opposite ends and a longitudinal bore having an inner peripheral wall; said second pipe being coaxially telescopically re

A telescopic pipe arrangement, comprising: a first pipe having two axially opposite ends and a longitudinal bore having an inner peripheral wall; a second pipe having two axially opposite ends and a longitudinal bore having an inner peripheral wall; said second pipe being coaxially telescopically received in said longitudinal bore of said first pipe, so that a first end portion including a first end of said second pipe protrudes axially beyond a first end of said first pipe, and a second end portion including said second end of said second pipe is disposed within said longitudinal bore of said first pipe distally of said first end of said first pipe; sealing means circumferentially sealing between said second end portion of said second pipe and said inner peripheral wall of said longitudinal bore of said first pipe; means defining a first band of helical threading externally on said second pipe between said sealing means and said first end of said second pipe; a first internally threaded nut threadedly engaged on said first band of helical threading axially adjacent said first end of said first pipe; means defining a second band of helical threading externally on said first internally threaded nut; a second internally threaded nut threadedly engaged on said second band of helical threading; an external radial flange provided on said first pipe adjacent said first end of said first pipe and having a first abutment shoulder facing axially away from said first end of said first pipe; said second internally threaded nut including an internal radial flange disposed on an axially opposite side of said external radial flange of said first pipe from said first end of said first pipe, and having a second axially facing abutment shoulder arranged to engage said first abutment shoulder of said external radial flange upon movement of said second nut axially towards said first end of said pipe upon corresponding rotation of said first nut relative to said second pipe; means for locking said first nut with respect to said second nut upon achieving a first degree of relative threaded rotation of said first nut relative to said second nut such as to advance said first nut axially towards said first end of said second pipe both absolutely and relative to said second nut, so that upon rotation of said first nut in one direction, said first pipe first causes an axial end of the first nut to effectively bear axially against said first end of said first pipe, with said first and second abutment shoulders effectively disengaged, and, upon further rotation in said one direction, causes increased axial extension of said second pipe relative to said first pipe, and rotation of said first nut in an opposite direction on said first pipe first causes said first and second abutment shoulders to effectively engage, with said axial end of said first nut effectively no longer bearing axially against said first end of said first pipe, and, upon further rotation in said opposite direction, causes increased axial retraction of said second pipe relative to said first pipe, and for unlocking said second nut with respect to said first nut upon achieving a second degree of initially forced relative threaded rotation of said second nut relative to said first nut, such as to extend said second nut axially towards said first end of said second pipe both absolutely and relative to said first nut, so that upon restraining said first nut against rotation and further rotation of said second nut, said axial end of said first nut is caused to effectively axially bear against said first end of said first pipe while said first and second abutment shoulders are caused to effectively engage, for preventing rotation of said first nut relative to said second pipe, thereby providing an adjustedly fixed degree of extension of said second pipe relative to said first pipe; and means selectively operable for preventing rotation of the second pipe relative to the first pipe for preserving said adjustedly fixed degree of extension of said second pipe relative to said first pipe.