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US 5,314,157 AGranted
Elongatable support
OwnerKurt Linnepe, Marcus Linnepeinventors
Life of this patent
Estimating the term…
Abstract
A telescoping support has at its actuating head at which a roller engages a bar which emerges from the outer tube, a sleeve-like extension provided with a pawl which can engage the bar in a sleeve-locking manner under load to prevent spontaneous contraction of the support upon rupture of the roller.
Claims13
An elongatable support, comprising:
- an outer tube having a mouth;
- a bar telescopingly slidable into and out of said tube at said mouth;
- and
- an actuating head on said outer tube at said mouth, said actuating head being formed with:
- a housing,
- a guide element pivotally mounted on said housing and having a pair of mutually parallel guide slots on opposite sides thereof and inclined to a surface of said bar,
- a drive roller having opposite ends guided in said slots and adapted to be wedged selfblockingly against said surface of said bar under a load applied to said support, said roller being provided with external means for rotating same and being formed with teeth on a surface of said drive roller engageable with said surface of said bar,
- spring means acting upon said drive roller for urging said drive roller into engagement with said surface of said bar, said housing having a portion extending beyond said mouth and comprising:
- a sleeve formed with a pair of lateral flanges and surrounding said bar proximal to said mouth, said flanges being bridged to form a capped enclosure provided with a slotlike opening and with a surface turned toward said tube, and
- an axle pin spanning said flanges,
- a clamping pawl swingably or shiftably mounted on said axle pin by one end extending through said slotlike opening and self-lockingly clamped against said bar by another end opposite said one end under load upon swinging of said pawl in one sense,
- at least one spring biasing said pawl in said one sense and being supported under prestress by said surface of said enclosure, and
- a release mechanism on said housing including a manually actuatable handle engageable operatively coupled with said one end of said pawl for displacing said pawl in an opposite sense to disengage said pawl from said bar.
10 more elements
An elongatable support, comprising:
- an outer tube having a mouth;
- a bar telescopingly slidable into and out of said tube at said mouth;
- and
- an actuating head on said outer tube at said mouth, said actuating head being formed with:
- a housing having a portion extending beyond said mouth and surrounding said bar proximal to said mouth,
- a guide element pivotally mounted on said housing about an axis perpendicular to an axis of said tube and parallel to a traverse of the fork and provided with a pair of shanks, said shanks extending beyond said mouth of said tube and being provided with a pair of mutually parallel guide slots formed on opposite sides of said fork and inclined to the surface of said bar;
- a drive roller having opposite ends guided in said slots and adapted to be wedged selfblockingly against said surface of said bar under a load applied to said support, said roller being provided with external means for rotating same and being formed with teeth on a surface of said drive roller engageable with said surface of said bar,
- spring means engaging said guide element and acting upon said drive roller for urging said drive roller into engagement with said surface of said bar, and
- a clamping pawl swingably mounted on said portion of said housing about a pawl axis parallel to the axis about which said fork is rotatable and self-lockingly clamped against said bar under load upon swinging of said guide fork in one sense, said pawl provided with flanges and having pin-like formations projecting laterally therefrom through slots formed in said flanges into a path of ends of said shanks,
- at least one spring biasing said pawl in said one sense, and
- a release mechanism on said housing including a manually actuatable handle operatively coupled with said pawl and said guide fork for engaging said pin-like formations with said shanks upon displacing said guide fork in an opposite sense to disengage said pawl from said bar.
8 more elements
Dependencies are inferred from the claim text.