US3628117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic leveller switching servomotor control circuit
Assignee: Boothe Airside Services Inc
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Filing: 1970-03-02
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Granted: 1971-12-14
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Expires: 1990-03-02
Abstract
Abstract An automatic levelling device is employed to maintain two movable bodies in the same relative positions with respect to each other. When the position of one body changes in a given plane, motor means are actuated to restore the bodies to their original relative positions.
Inventors
- 👤 Walter S Eggert Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/30; B64F1/305
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
294 words
A system for maintaining the relative position of a first body with respect to a second body comprising an extendable pivotable member, mounting means for said pivotable member secured to said first body, said mounting means having tension means to extend said pivotable member to physically contact said second body and to maintain it in contact therewith when said first and second bodies are moved relative to each other in a plane, a plurality of switches, cam means including a plurality of cam elements disposed to engage said plurality of switches and responsive to pivotable movement of said pivotable member to open and close selected ones of said switches in accordance with the relative movement of said first and second bodies, motor means for moving said first body, said plurality of switches being spaced with respect to said cam elements to operate said motor means only after the relative positions of said first and second bodies have varied beyond a predetermined distance, means for varying the positions of said cam elements with respect to said switches for varying said predetermined distance at which said motor means becomes operative, said plurality of switches including two sets of switches with the first set to control the movement of said first body in one direction and the other set to control the movement of said first body in a second direction, each set of switches including spaced apart control switches to be sequentially operated when said pivotable member is moved beyond a predetermined distance, and said motor means being responsive to the operating states of said switches to move and restore said first body to its original relative position with respect to said second body when one of said bodies is moved with respect to the other.
Claim 2
Independent Claim
294 words
A system for maintaining the relative position of a first body with respect to a second body comprising an extendable pivotable member, mounting means for said pivotable member secured to said first body, said mounting means having tension means to extend said pivotable member to physically contact said second body and to maintain it in contact therewith when said first and second bodies are moved relative to each other in a plane, a plurality of switches, cam means including a plurality of cam elements disposed to engage said plurality of switches and responsive to pivotable movement of said pivotable member to open and close selected ones of said switches in accordance with the relative movement of said first and second bodies, motor means for moving said first body, said plurality of switches being spaced with respect to said cam elements to operate said motor means only after the relative positions of said first and second bodies have varied beyond a predetermined distance, means for varying the positions of said cam elements with respect to said switches for varying said predetermined distance at which said motor means becomes operative, said plurality of switches including two sets of switches with the first set to control the movement of said first body in one direction and the other set to control the movement of said first body in a second direction, each set of switches including spaced apart control switches to be sequentially operated when said pivotable member is moved beyond a predetermined distance, and said motor means being responsive to the operating states of said switches to move and restore said first body to its original relative position with respect to said second body when one of said bodies is moved with respect to the other.
Claim 3
Dependent Claim
27 words
The invention as set forth in claim 1 wherein said mounting means includes a housing containing said plurality of switches disposed to ride on a rail element.
Claim 4
Dependent Claim
26 words
The invention as set forth in claim 2 wherein said tension means includes a spring loaded wheel and a cord normally urging said pivotable member forward.
Claim 5
Dependent Claim
29 words
The invention as set forth in claim 3 wherein an indicator means is provided responsive to the operation of said plurality of switches to indicate the operating conditions thereof.
References Cited (Backward Citations)
US2717344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |