Patent US4467251A successfully refreshed from Google Patents.
US4467251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Object sensing apparatus
Assignee: Besam AB
•
Filing: 1982-02-11
•
Granted: 1984-08-21
•
Expires: 2002-02-11
Abstract
Abstract An object sensing apparatus includes a plurality of light emitting diodes for illuminating a region of space and a plurality of closely arranged light detectors for receiving light reflected from an object. The apparatus is particularly useful in connection with automatically operated doors.
Inventors
- 👤 Bert O. Jonsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:19
CPC Classifications
G; G01; G01V; G01V8/00; G01V8/10; G01V8/20; E; E05; E05F; E05F15/00; E05F15/70; E05F15/73; G01S; G01S17/00; G01S17/02; G01S17/04; G01S17/87; E05F2015/765; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132; E05Y2900/50; E05Y2900/516
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
237 words
Control apparatus for an automatic door having motor operated means for swinging said door open in a selected first direction path from a door frame in response to the approach of an object from a second direction, and for inhibiting operation of said motor operated means in response to the presence of an object in said first direction path of said door, comprising: a first object sensing apparatus, mounted on said door and facing said first direction; a second object sensing apparatus, mounted on said door and facing in said second direction; said first and second sensing apparatus each comprising a plurality of elements, each for emitting a diverging beam of diffuse radiation in response to supplied electrical signals, means for simultaneously supplying electrical signals to all of said elements, a plurality of radiation detecting elements for receiving radiation reflected from an object, and a receiver connected to said detecting elements for providing an output signal representative of the presence of an object; and a control circuit for: (1) activating said motor means to open said door in response to the output signal from said second sensing apparatus; (2) activating said motor means to maintain said door in an open position in response to the output signal from said second sensing apparatus, and (3) inhibiting operation of said motor means and preventing opening of said door in response to the output signal from said first sensing apparatus.
Claim 2
Dependent Claim
237 words
Control apparatus for an automatic door having motor operated means for swinging said door open in a selected first direction path from a door frame in response to the approach of an object from a second direction, and for inhibiting operation of said motor operated means in response to the presence of an object in said first direction path of said door, comprising: a first object sensing apparatus, mounted on said door and facing said first direction; a second object sensing apparatus, mounted on said door and facing in said second direction; said first and second sensing apparatus each comprising a plurality of elements, each for emitting a diverging beam of diffuse radiation in response to supplied electrical signals, means for simultaneously supplying electrical signals to all of said elements, a plurality of radiation detecting elements for receiving radiation reflected from an object, and a receiver connected to said detecting elements for providing an output signal representative of the presence of an object; and a control circuit for: (1) activating said motor means to open said door in response to the output signal from said second sensing apparatus; (2) activating said motor means to maintain said door in an open position in response to the output signal from said second sensing apparatus, and (3) inhibiting operation of said motor means and preventing opening of said door in response to the output signal from said first sensing apparatus.
Claim 3
Dependent Claim
30 words
Apparatus as specified in claim 1 wherein said con circuit inhibiting operation is not operative after said motor means is operative and said door is opened by a selected amount.
Claim 4
Dependent Claim
90 words
Apparatus as specified in claims 1 or 2 wherein there is further provided radiation emitting means arranged to direct radiation along a path to said detecting elements of said first sensing apparatus when said door is opened, and wherein said control means is arranged to activate said emitting means after said door is opened by a selected amount and wherein said control means is arragned to inhibit operation of said motor means upon obstruction of said path between said emitting means and said detecting elements of said first sensing apparatus.
Claim 5
Dependent Claim
38 words
Apparatus as specified in claim 1 wherein at least one of said receivers includes means responsive to a supplied signal for reducing receiver sensitivity, and wherein said control circuit generates said supplied signal upon activation of said motor.
References Cited (Backward Citations)
US1719621A
Cited
US1929273A
Cited
US2341546A
Cited
US2401396A
Cited
US2331023A
Cited
US3120654A
Cited
US3183499A
Cited
DE1271601B
Cited
US3278754A
Cited
US3470382A
Cited
US3644917A
Cited
US3742222A
Cited
US3680047A
Cited
US3719938A
Cited
US3704396A
Cited
US3739372A
Cited
US3746863A
Cited
US3858043A
Cited
US3911344A
Cited
US3875403A
Cited
US3805061A
Cited
US3852592A
Cited
US3885872A
Cited
US3889118A
Cited
US3912924A
Cited
US4015122A
Cited
US4068222A
Cited
US4029176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |