IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0839468
(2001-04-20)
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발명자
/ 주소 |
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출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
4 |
초록
▼
Disclosed are electronic plumb indicators for monopoles, survey poles, global positioning antennas and the like. A exemplary plumb indicator comprises a substrate, a plumb bob suspended by a thread (e.g., wire, cable, string, etc.) and disposed over a first surface of the substrate, and a probe. The
Disclosed are electronic plumb indicators for monopoles, survey poles, global positioning antennas and the like. A exemplary plumb indicator comprises a substrate, a plumb bob suspended by a thread (e.g., wire, cable, string, etc.) and disposed over a first surface of the substrate, and a probe. The substrate has an array of conductive pads disposed over its first surface, preferably in a regular pattern. The probe has a first body portion held by the plumb bob but allowed to move freely in the vertical direction, and a conductive tip disposed between the plumb bob and the first surface of the substrate. The probe tip makes contact with the first surface of the substrate, and contacts one or more pads in normal operation. The pads may be scanned electronically to determine the location of the probe tip and plumb bob with respect to the substrate.
대표청구항
▼
Disclosed are electronic plumb indicators for monopoles, survey poles, global positioning antennas and the like. A exemplary plumb indicator comprises a substrate, a plumb bob suspended by a thread (e.g., wire, cable, string, etc.) and disposed over a first surface of the substrate, and a probe. The
Disclosed are electronic plumb indicators for monopoles, survey poles, global positioning antennas and the like. A exemplary plumb indicator comprises a substrate, a plumb bob suspended by a thread (e.g., wire, cable, string, etc.) and disposed over a first surface of the substrate, and a probe. The substrate has an array of conductive pads disposed over its first surface, preferably in a regular pattern. The probe has a first body portion held by the plumb bob but allowed to move freely in the vertical direction, and a conductive tip disposed between the plumb bob and the first surface of the substrate. The probe tip makes contact with the first surface of the substrate, and contacts one or more pads in normal operation. The pads may be scanned electronically to determine the location of the probe tip and plumb bob with respect to the substrate. pports an item upon a support surface in an inoperative state and supports the item to roll along the support surface in an operative state, comprising: (a) a housing having a symmetrically located axis, said housing including a base portion and a surrounding sidewall extending from said base portion towards the support surface to define a housing interior, said surrounding sidewall having an exterior portion and an interior portion; (b) a swingarm fixed pivot frame that is pivotally engaged with said interior portion of said surrounding sidewall, said swingarm fixed pivot frame having a pivotal movement that is relative to said housing, said swingarm fixed pivot frame having an inoperative position state wherein said swingarm fixed pivot frame is pivoted to allow said surrounding sidewall to rest on and statically contact the support surface and an operative position state wherein said swingarm fixed pivot frame is pivoted from the inoperative position state to allow said surrounding sidewall to separate from the support surface; (c) a spring element disposed within said housing interior positioned between said base and said swingarm fixed pivot frame to bias said swingarm fixed pivot frame toward the operative position state; and (d) a non castor wheel rotatably mounted in said swingarm fixed pivot frame, said wheel disposed to only roll bidirectionally along the support surface when said swingarm fixed pivot frame is in the operative position state such that said surrounding sidewall is not in contact with the support surface, said wheel having a rotational axis perpendicular to and intersecting the housing axis. 6. A fixed pivotal retractable roller mechanism according to claim 5 wherein said swingarm fixed pivot frame is constructed of a pivoted bifurcated bracket straddling said wheel, said pivoted bifurcated bracket is disposed within said housing interior in the inoperative position state and in the operative position state. 7. A fixed pivotal retractable roller mechanism according to claim 6 wherein said pivoted bifurcated bracket includes a brace portion terminating into two arm portions that straddle said roller element. 8. A fixed pivotal retractable roller mechanism according to claim 7 further including an axle disposed between said arm portions wherein said wheel is rotatably mounted on said axle. 9. A fixed pivotal retractable roller mechanism according to claim 8 wherein said arm portions on a side opposite said axle terminate in a pivotal attachment to said surrounding sidewall around a pivotal axis that is parallel to the rotational axis. 10. A fixed pivotal retractable roller mechanism according to claim 5 wherein said base is adapted to be attached to the item. 11. A fixed pivotal retractable roller mechanism according to claim 10 wherein said attachment includes a fastener. 12. A fixed pivotal retractable roller mechanism according to claim 5 wherein said spring element has a spring strength constant "K" as measured in force per unit distance such that said swingarm fixed pivot frame is in the operative position state when said pivotal retractable roller mechanism is supporting the items weight and said swingarm fixed pivot frame is in the inoperative position state when said pivotal retractable roller mechanism is supporting a weight greater than the items weight. 13. A fixed pivotal retractable roller mechanism according to claim 5 further including a contact attachment disposed between said spring element and said base, and said spring element and said swingarm fixed pivot frame, said contact attachments are functional to limit said swingarm fixed pivot frame pivotal movement in the operative position state. 14. A pivotal castor roller mechanism that supports an item to roll along a support surface in an operative position state, comprising: (a) a housing having a centrally located axis, said housing including a circular base portion and a surrounding cylindrical sidewall extending from said
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