Patent US3831024A successfully refreshed from Google Patents.
US3831024A
Expired / Lapsed
US
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Position sensing apparatus
Assignee: Dresser Industries Inc
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Filing: 1972-08-04
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Granted: 1974-08-20
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Expires: 1992-08-04
Abstract
Abstract A position sensing apparatus mounted on the cutting tool of a surface finishing machine for automatically adjusting the height of said cutting tool; said apparatus having a feeler arm adapted to ride over a reference string being preset at a desired height, and a switch control arm disposed within a dust proof housing and coupled to said feeler arm for opening and closing a photoelectric cell switch within said housing. The cutting tool is raised and lowered by an elevator mechanism, such as a fluid responsive cylinder, of the double-acting type, or hydraulic motor arrangement, which is in communication with an electrohydraulic valve and operates responsive to the movement of said switch control arm to maintain the height of the cutting tool at the desired level above the ground surface.
Inventors
- 👤 R Gill
- 👤 Mahon F Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:51
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/80; E02F3/84; E02F3/841; G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
220 words
A position sensing apparatus operable responsive to the position of a preset reference string comprising: Means defining a housing; Switch means within said housing including: light projecting means, and first and second light responsive switches disposed in aligned relationship with said light projecting means; A switch control arm rockably mounted within said housing for energizing said switch means, said switch control arm having a first end portion and a second end portion; The second end portion of said switch control arm being normally presented between said light projecting means and said first and second light responsive switches for maintaining same in a circuit-opened condition, said second end portion having a width greater than the distance between the centers of said first and second light responsive switches; A rockably mounted feeler member disposed exteriorally of said housing and having an elongate slot for receiving said reference string, said feeler member being presented in a plane being in parallel, spaced-apart relationship with the plane containing said switch control arm; Means coupling said feeler member to the first end portion of said switch control arm for effecting simultaneous movement therewith so that upon swinging of said feeler member, the switch control arm will swing to close the circuit between the light projecting means and one of said first and second light responsive switches.
Claim 2
Dependent Claim
220 words
A position sensing apparatus operable responsive to the position of a preset reference string comprising: Means defining a housing; Switch means within said housing including: light projecting means, and first and second light responsive switches disposed in aligned relationship with said light projecting means; A switch control arm rockably mounted within said housing for energizing said switch means, said switch control arm having a first end portion and a second end portion; The second end portion of said switch control arm being normally presented between said light projecting means and said first and second light responsive switches for maintaining same in a circuit-opened condition, said second end portion having a width greater than the distance between the centers of said first and second light responsive switches; A rockably mounted feeler member disposed exteriorally of said housing and having an elongate slot for receiving said reference string, said feeler member being presented in a plane being in parallel, spaced-apart relationship with the plane containing said switch control arm; Means coupling said feeler member to the first end portion of said switch control arm for effecting simultaneous movement therewith so that upon swinging of said feeler member, the switch control arm will swing to close the circuit between the light projecting means and one of said first and second light responsive switches.
Claim 3
Dependent Claim
64 words
A position sensing apparatus as defined in claim 1 and further characterized by: Said switch control arm having side edges; The second end portion of said switch control arm having flared margins diverging outwardly of said side edges for defining a triangular-shaped tongue; Said tongue being normally presented in blocking relationship between said light projecting means and said first and second light responsive switches.
Claim 4
Dependent Claim
60 words
A position sensing apparatus as defined in claim 2 and further characterized by: Adjustment means carried by the first end portion of said switch control arm for moving same longitudinally within said housing to adjust the position of said flared margins of said triangular-shaped tongue relative to the distance between the centers of said first and second light responsive switches.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |