Geomatic pole support with telescoping legs and locks
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A47B-091/00
F16M-011/20
출원번호
US-0418644
(2003-04-18)
발명자
/ 주소
Crain,Stephen B.
Moore,Christopher T.
Oathout,Jeffrey L.
Everly,Ron D.
Essex,Larry W.
Williamson,Jerry L.
Mize,Ralph C.
출원인 / 주소
Crain Enterprises, Inc.
대리인 / 주소
Senniger Powers
인용정보
피인용 횟수 :
4인용 특허 :
76
초록▼
A support particularly adapted for supporting a geomatic pole has telescoping legs, each having telescoping leg sections which can be locked by a locking device in a selected position of extension, fixing the length of the leg. The locking device is easily actuated and released and is biased toward
A support particularly adapted for supporting a geomatic pole has telescoping legs, each having telescoping leg sections which can be locked by a locking device in a selected position of extension, fixing the length of the leg. The locking device is easily actuated and released and is biased toward a locked position. In an unlocked position, the locking device is positively positioned to inhibit contact with the released leg section so that movement is smooth and unnecessary wear is limited. The locking device has an engagement portion which is constructed to promote locking, but also to facilitate release and limit unnecessary wear of the engagement portion.
대표청구항▼
What is claimed is: 1. A leg for use in supporting geomatic equipment comprising a first leg section and a second leg section, the first leg section being telescopingly received into an interior of the second leg section for selective extension from and retraction into the second leg section to len
What is claimed is: 1. A leg for use in supporting geomatic equipment comprising a first leg section and a second leg section, the first leg section being telescopingly received into an interior of the second leg section for selective extension from and retraction into the second leg section to lengthen and shorten the leg, and a locking device including an actuator and an engagement portion positioned to act on the interior of the second leg section to lock the first and second leg sections relative to each other to fix the length of the leg, the locking device being operable in a lock position in which the engagement portion of the locking device bears against the second leg section on the interior thereof with a force selected to lock the first and second leg sections, and an unlock position in which the engagement portion is spaced from the second leg section such that the leg sections are free to move in telescoping relation to change the length of the leg, the engagement portion comprising a resilient member made of elastomeric material, the resilient member having edges spaced axially of the leg, the thickness of the resilient member tapering from a central region thereof toward the axial edges. 2. A leg for use in supporting geomatic equipment as set forth in claim 1, wherein the resilient member is thicker in the central region than at the axial edges. 3. A leg for use in supporting geomatic equipment as set forth in claim 2 wherein the engagement portion comprises two resilient members having the same construction. 4. A leg for use in supporting geomatic equipment as set forth in claim 3 wherein the resilient members have serrations arranged to engage the second leg section in the lock position. 5. A leg for use in supporting geomatic equipment as set forth in claim 4 wherein the locking device comprises first and second lock members, the resilient members being mounted on respective lock members movable between the lock and unlock positions. 6. A leg for use in supporting geomatic equipment comprising a first leg section, a second leg section, the first leg section being telescopingly received into an interior of the second leg section for selective extension from and retraction into the second leg section to lengthen and shorten the leg, a locking device including an actuator and an engagement portion positioned to act on the interior of the second leg section to lock the first and second leg sections relative to each other to fix the length of the leg, the locking device being operable in a lock position in which the engagement portion of the locking device bears against the second leg section on the interior thereof with a force selected to lock the first and second leg sections, and an unlock position in which the actuator applies a force to the engagement portion of the locking device drawing it inwardly during movement of the actuator so that the engagement portion is everywhere spaced from the second leg section such that the leg sections are free to move in telescoping relation to change the length of the leg, the locking device comprising first and second opposing lock members, each of the lock members having a ramp surface thereon and wherein the actuator has two cams each being engaged with a respective ramp surface, and a wedge moveable relative to the lock members to move the lock members apart in the lock position and to allow the lock members to move closer together in the unlock position. 7. A leg for use in supporting geomatic equipment as set forth in claim 6 wherein each of the first and second lock members comprises an upper guide portion engageable with the actuator for guiding the actuator, a hinge and a lower portion having the engagement portion thereon, the lower portion being connected by the hinge to the upper portion, and wherein each lock member is formed as one piece of polymeric material. 8. A leg for use in supporting geomatic equipment as set forth in claim 6 wherein each of the lock members has an inclined surface disposed for engaging the wedge. 9. A leg for use in supporting geomatic equipment as set forth in claim 6 wherein the engagement portion of the locking device further comprises a resilient member for each of the lock members, the resilient member being disposed for engagement with the second leg section on the interior thereof for frictionally gripping the second leg section to lock the first and second leg sections in the lock position, each resilient member including first and second edges, and having a thickness which tapers from a central region of the resilient member toward each of the first and second edges. 10. A leg for use in supporting geomatic equipment as set forth in claim 9 wherein each resilient member has serrations therein arranged to engage the second leg section in the lock position. 11. A leg for use in supporting geomatic equipment as set forth in claim 6 wherein the actuator is operable from a first end of the first leg section opposite a second end of the leg section at which the lock members are disposed, the actuator comprising a rod extending generally from said first end of the first section to the wedge, and a button located on the first leg section at said first end thereof capable of moving the rod and wedge lengthwise of the leg to the unlock position, the button being biased to a raised position corresponding to the lock position of the locking device, the first leg section and the button being formed for selectively retaining the button to hold the locking device in the unlock position. 12. A leg for use in supporting geomatic equipment as set forth in claim 11 further comprising a bushing in the first leg section guiding and supporting the actuator rod relative to the first leg section. 13. A leg for use in supporting geomatic equipment as set forth in claim 11 wherein a distance between the button and wedge is adjustable to accommodate wear of the engagement portion of the locking device. 14. A leg for use in supporting geomatic equipment as set forth in claim 13 wherein the locking device is constructed and arranged for wear adjustment with the first and second leg sections assembled with each other. 15. A leg for use in supporting geomatic equipment as set forth in claim 13 wherein the locking device is constructed and arranged for wear adjustment in the unlock position so that adjustment can be made with the locking device unloaded. 16. A leg for use in supporting geomatic equipment as set forth in claim 6 wherein the locking device is associated with the first leg section. 17. A leg for use in supporting geomatic equipment as set forth in claim 6 wherein the second leg section is adapted for releasable, snap-together connection with the first leg section. 18. A leg for use in supporting geomatic equipment as set forth in claim 17 in combination with at least one replacement leg section adapted for releasable, snap-together connection with the first leg section to replace the second leg section. 19. The combination set forth in claim 18 wherein the replacement leg section has a configuration different from the second leg section. 20. A leg for use in supporting geomatic equipment as set forth in claim 6 wherein the actuator comprises a button and a rod extending from the button to the engagement portion of the locking device, the button mounted on the first leg section for movement lengthwise relative to the first leg section to move the locking device between the lock position and the unlock position, the button being adapted to move laterally relative to the first leg section for selectively engaging the button with the first leg section to hold the button in the unlock position of the locking device.
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