US4941320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Industrial hydraulic door operator
Assignee: ASI TECHNOLOGIES Inc MILWAUKEE WISCONSIN A WI CORP
•
Filing: 1988-06-17
•
Granted: 1990-07-17
•
Expires: 2008-06-17
Abstract
Abstract A door operator having a fluid drive motor and a manual override. The bidirectional hydraulic motor connects to a drive shaft through a power train including a shiftable --quill--type manual clutch mechanism which allows an alternate connection of the drive shaft to a manually-operated wheel. When the cable which shifts the clutch for manual drive is pulled, a switch disables the control for the hydraulic motor. When the motor is not provided with pressured fluid from the pump a hydraulic brake engages the motor.
Inventors
- 👤 Otto E. Kersten
- 👤 Jack E. Moll
- 👤 George C. Balbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:14
CPC Classifications
E; E06; E06B; E06B9/00; E06B9/56; E06B9/80; E06B9/82; E06B9/88; E05; E05F; E05F15/00; E05F15/50; E05F15/57; E05F15/59; E05Y; E05Y2800/00; E05Y2800/20; E05Y2800/23; E05Y2800/234; E05Y2900/00; E05Y2900/10; E05Y2900/106; E06B9/68; E06B2009/6809; E06B2009/6818; E06B2009/6854; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19023; Y10T74/19051; Y10T74/1907
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
200 words
A door operator for opening and closing a door, comprising: a drive shaft connectable to the door to move the door between open and closed positions; a bi-directional hydraulic motor driven by a pump and connectable by a power train to the drive shaft; an hydraulic brake connectable with the power train; control means for controlling the direction and duration of operation of the hydraulic motor and for engaging the brake whenever the motor is not provided with fluid under pressure from the pump; a shiftable quill for connecting the power train to the drive shaft; a manually operable wheel alternatively connectable to the drive shaft by the shiftable quill; shift means for manually moving the shiftable quill between a position in which the power train is connected to the drive shaft and an alternate position in which the wheel is connected to the drive shaft, the shift means comprising a shifting fork that is engageable with the quill upon pulling of a cable connected to the fork, said fork being spring biased to a normal position out of engagement with the quill; and a switch actuated by the cable to disable the control means whenever the cable is pulled.
Claim 2
Dependent Claim
200 words
A door operator for opening and closing a door, comprising: a drive shaft connectable to the door to move the door between open and closed positions; a bi-directional hydraulic motor driven by a pump and connectable by a power train to the drive shaft; an hydraulic brake connectable with the power train; control means for controlling the direction and duration of operation of the hydraulic motor and for engaging the brake whenever the motor is not provided with fluid under pressure from the pump; a shiftable quill for connecting the power train to the drive shaft; a manually operable wheel alternatively connectable to the drive shaft by the shiftable quill; shift means for manually moving the shiftable quill between a position in which the power train is connected to the drive shaft and an alternate position in which the wheel is connected to the drive shaft, the shift means comprising a shifting fork that is engageable with the quill upon pulling of a cable connected to the fork, said fork being spring biased to a normal position out of engagement with the quill; and a switch actuated by the cable to disable the control means whenever the cable is pulled.
Claim 3
Dependent Claim
89 words
A door operator for opening and closing a door, comprising: a drive shaft connectable to the door to move the door between open and closed positions; a bi-directional hydraulic motor driven by a pump and connectable by a power train to the drive shaft; an hydraulic brake connectable with the power train; and control means for controlling the direction and duration of operation of the hydraulic motor and for engaging the brake following a time delay whenever the motor is not provided with fluid under pressure from the pump.
Claim 4
Dependent Claim
89 words
A door operator for opening and closing a door, comprising: a drive shaft connectable to the door to move the door between open and closed positions; a bi-directional hydraulic motor driven by a pump and connectable by a power train to the drive shaft; an hydraulic brake connectable with the power train; and control means for controlling the direction and duration of operation of the hydraulic motor and for engaging the brake following a time delay whenever the motor is not provided with fluid under pressure from the pump.
Claim 5
Dependent Claim
37 words
A door operator in accordance with claim 2 wherein the hydraulic brake is spring-actuated to engage the drive train and is released from engagement when the hydraulic motor is provided with fluid under pressure from the pump.
Claim 6
Dependent Claim
46 words
A door operator in accordance with claim 3 wherein the brake is a caliper disc brake that engages with a rotor in the power train, and the control means includes a solenoid operated valve to provide fluid pressure to the brake for release of the rotor.
Claim 7
Dependent Claim
30 words
A door operator in accordance with the claim 4 wherein the pump is driven by an electric motor and the solenoid operated valve is energized whenever the motor is energized.
References Cited (Backward Citations)
US2110231A
Cited
US2096251A
Cited
US2670065A
Cited
US2622452A
Cited
US2758836A
Cited
US3001038A
Cited
US3383948A
Cited
US3992991A
Cited
SU718635A1
Cited
US4296570A
Cited
US4519487A
Cited
US4474078A
Cited
US4694607A
Cited
US4721146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |