Patent US2561525A successfully refreshed from Google Patents.
Patent US3921335A successfully refreshed from Google Patents.
US3921335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air operated door opener
Assignee: Overhead Door Corp
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Filing: 1973-10-24
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Granted: 1975-11-25
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Expires: 1993-10-24
Abstract
Abstract A pneumatically powered system for controlling a pneumatic cylinder having a double acting piston connected to a door for moving same between opened and closed positions. Opening of the door is activated by a pressure sensitive mat which directs the flow of pressurized air from a source to the control system which opens the door. A pneumatic timer controls the period of time during which the door remains open, and it produces a signal at the end of the time period which closes the door. The control system includes means for checking the door movement near the fully opened position and near the fully closed position.
Inventors
- 👤 Lew V Hewitt
- 👤 Jr Dee D Horton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:21
CPC Classifications
E; E05; E05F; E05F13/00; E05F13/04; E05F15/00; E05F15/50; E05F15/56; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
347 words
A pneumatically operated system for controlling a pneumatic cylinder having a double acting piston connected to a door to move said door between open and closed positions, the movement of which is initiated by a pressure sensitive mat which is depressed to open said door, comprising: a source of pressurized air; means for sensing the depression of said mat and producing a signal in response thereto; valve means responsive to said signal to effect a directing of a supply of said pressurized air to one end of said pneumatic cylinder and to effect opening movement of said door; timing means for generating a change signal at the end of a preselected time period following the discontinuation of the depression of said mat and the effecting a redirecting of said supply of said pressurized air to the other end of said pneumatic cylinder and to effect a closing movement of said door; and three door position sensing means for detecting the position of said door, a first one of said door position sensing means being adjacent the fully opened position, a second one of said door position sensing means being adjacent the fully closed position, a third one of said door position sensing means being at the fully closed position, said first and second door position sensing means including a single valve having a restricted first outlet connected to the atmosphere and a second unrestricted outlet connected to the atmosphere, said first and second door position sensing means connecting the exiting air from said system to said restricted first outlet when the position of said door is adjacent the fully open and closed positions during a door opening and door closing operation, respectively, and connecting the exiting air from said system to said second unrestricted outlet connected directly to the atmosphere when the position of said door is between said positions adjacent said fully opened and fully closed positions, said third door position sensing means connecting both ends of said pneumatic cylInder to said atmosphere through said second outlet when said door is at said fully closed position.
Claim 2
Dependent Claim
347 words
A pneumatically operated system for controlling a pneumatic cylinder having a double acting piston connected to a door to move said door between open and closed positions, the movement of which is initiated by a pressure sensitive mat which is depressed to open said door, comprising: a source of pressurized air; means for sensing the depression of said mat and producing a signal in response thereto; valve means responsive to said signal to effect a directing of a supply of said pressurized air to one end of said pneumatic cylinder and to effect opening movement of said door; timing means for generating a change signal at the end of a preselected time period following the discontinuation of the depression of said mat and the effecting a redirecting of said supply of said pressurized air to the other end of said pneumatic cylinder and to effect a closing movement of said door; and three door position sensing means for detecting the position of said door, a first one of said door position sensing means being adjacent the fully opened position, a second one of said door position sensing means being adjacent the fully closed position, a third one of said door position sensing means being at the fully closed position, said first and second door position sensing means including a single valve having a restricted first outlet connected to the atmosphere and a second unrestricted outlet connected to the atmosphere, said first and second door position sensing means connecting the exiting air from said system to said restricted first outlet when the position of said door is adjacent the fully open and closed positions during a door opening and door closing operation, respectively, and connecting the exiting air from said system to said second unrestricted outlet connected directly to the atmosphere when the position of said door is between said positions adjacent said fully opened and fully closed positions, said third door position sensing means connecting both ends of said pneumatic cylInder to said atmosphere through said second outlet when said door is at said fully closed position.
Claim 3
Dependent Claim
75 words
A pneumatically operated door control system according to claim 1, wherein said door includes means defining a cam surface connected thereto and movable therewith; and wherein said door position sensing means comprises three cam operated air control valves each responsive to a different position of said cam means and thence said door to control the connection of said exiting air to said restricted first outlet and said second unrestricted outlet connected directly to said atmosphere.
Claim 4
Dependent Claim
34 words
A pneumatically operated door control system according to claim 1, wherein said timing means is a pneumatically operated timer responsive to the same air pressure that is utilized to open and close the door.
Claim 5
Dependent Claim
311 words
A pneumatically operated system for controlling a pneumatic cylinder having a double acting piston connected to a door to move said door between open and closed positions, the movement of which is initiated by a pressure sensitive mat which is depressed to open said door, comprising: a source of pressurized air; means for sensing the depression of said mat and directing a supply of said pressurized air to one end of said pneumatic cylinder to effect opening movement of said door; timing means for generating a change signal at the end of a preselected time period following the discontinuation of the depression of said mat; means responsive to said change signal for redirecting said supply of pressurized air from said one end of said cylinder to the opposite end of said cylinder to effect closing movement of said door; door position sensing means for detecting the position of said door and (1) producing an opening signal in response to said door opening movement near the fully open position and (2) producing a closing signal in response to the door movement near the fully closed position; and a single air flow control valve having plural outlet ports, one of said ports being connected in circuit with an air restriction valve and another of said ports being connected directly to atmosphere, said air control valve being (1) responsive to said opening signal for connecting said other end of said cylinder to said air restriction valve to effect a slowing of said door opening movement near said fully open position to a speed less than the initial door opening speed and (2) responsive to said closing signal for connecting said one end of said cylinder to said air restriction valve to effect a slowing of said door closing movement near said fully closed position to a speed less than the initial door closing speed.
Claim 6
Dependent Claim
311 words
A pneumatically operated system for controlling a pneumatic cylinder having a double acting piston connected to a door to move said door between open and closed positions, the movement of which is initiated by a pressure sensitive mat which is depressed to open said door, comprising: a source of pressurized air; means for sensing the depression of said mat and directing a supply of said pressurized air to one end of said pneumatic cylinder to effect opening movement of said door; timing means for generating a change signal at the end of a preselected time period following the discontinuation of the depression of said mat; means responsive to said change signal for redirecting said supply of pressurized air from said one end of said cylinder to the opposite end of said cylinder to effect closing movement of said door; door position sensing means for detecting the position of said door and (1) producing an opening signal in response to said door opening movement near the fully open position and (2) producing a closing signal in response to the door movement near the fully closed position; and a single air flow control valve having plural outlet ports, one of said ports being connected in circuit with an air restriction valve and another of said ports being connected directly to atmosphere, said air control valve being (1) responsive to said opening signal for connecting said other end of said cylinder to said air restriction valve to effect a slowing of said door opening movement near said fully open position to a speed less than the initial door opening speed and (2) responsive to said closing signal for connecting said one end of said cylinder to said air restriction valve to effect a slowing of said door closing movement near said fully closed position to a speed less than the initial door closing speed.
Claim 7
Dependent Claim
83 words
A pneumatically operated door control system according to claim 4, wherein said door position sensing means also senses the position of said door in the fully closed position and produces a third signal; and including a second air flow control valve responsive to said third signal to effect a connection, when said external pressure on said mat is insufficient to effect a supply of pressurized air to either end of said pneumatic cylinder, of both ends of said pneumatic cylinder to the atmosphere.
Claim 8
Dependent Claim
64 words
A pneumatically operated door control system according to claim 5, wherein said door includes means defining a cam surface connected thereto and movable therewith; and wherein said door position sensing means comprises at least three cam operated air control valves each responsive to a different position of said cam means and thence said door to produce one of said first, second and third signals.
Claim 9
Dependent Claim
34 words
A pneumatically operated door control system according to claim 4, wherein said timing means is a pneumatically operated timer responsive to the same air pressure that it utilized to open and close the door.
Claim 10
Dependent Claim
307 words
A pneumatically operated system for controlling a pneumatic cylinder having a double acting piston connected to a door to move said door between open and closed positions, said movement being initiated by a presSure sensitive mat which is depressed to open said door, comprising: a source of pressurized gas; means for sensing the depression of said mat and producing a signal in response thereto; a single valve responsive to said signal to direct a supply of said pressurized gas to one end of said pneumatic cylinder whereby to effect opening movement of said door; timing means for generating a change signal at the end of a preselected time period following the discontinuation of material depression of said mat, said valve being responsive to said change signal to direct said supply of pressurized gas to the other end of said pneumatic cylinder whereby to effect a closing movement of said door; means defining a cam surface secured to and movable with said door; door position sensing means including a pair of cam operated gas control valves responsive to a different position of said cam means and issuing a signal dependent upon the position of said door, each of said cam operated gas control valves having a restricted outlet to the atmosphere and an unrestricted outlet to the atmosphere thereon, at least one of said cam operated gas control valves controlling the gas discharge from said cylinder while said door is moving toward the opened and closed position by directing said gas discharged from said cylinder through said restricted outlets when said door is near its fully open and closed positions during a door opening and door closing operation, respectively, and for directing said gas from said cylinder to the atmosphere through said unrestricted outlets when said door is between said positions nearly fully opened and nearly fully closed.
Claim 11
Dependent Claim
307 words
A pneumatically operated system for controlling a pneumatic cylinder having a double acting piston connected to a door to move said door between open and closed positions, said movement being initiated by a presSure sensitive mat which is depressed to open said door, comprising: a source of pressurized gas; means for sensing the depression of said mat and producing a signal in response thereto; a single valve responsive to said signal to direct a supply of said pressurized gas to one end of said pneumatic cylinder whereby to effect opening movement of said door; timing means for generating a change signal at the end of a preselected time period following the discontinuation of material depression of said mat, said valve being responsive to said change signal to direct said supply of pressurized gas to the other end of said pneumatic cylinder whereby to effect a closing movement of said door; means defining a cam surface secured to and movable with said door; door position sensing means including a pair of cam operated gas control valves responsive to a different position of said cam means and issuing a signal dependent upon the position of said door, each of said cam operated gas control valves having a restricted outlet to the atmosphere and an unrestricted outlet to the atmosphere thereon, at least one of said cam operated gas control valves controlling the gas discharge from said cylinder while said door is moving toward the opened and closed position by directing said gas discharged from said cylinder through said restricted outlets when said door is near its fully open and closed positions during a door opening and door closing operation, respectively, and for directing said gas from said cylinder to the atmosphere through said unrestricted outlets when said door is between said positions nearly fully opened and nearly fully closed.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |