Patent US4612448A successfully refreshed from Google Patents.
Patent US3926460A successfully refreshed from Google Patents.
US3926460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking device for doors
Assignee: C Hager and Sons Hinge Manufacturing Co
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Filing: 1974-07-15
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Granted: 1975-12-16
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Expires: 1994-07-15
Abstract
Abstract A locking device for securing a door includes an air cylinder set into the floor below the door and this cylinder contains a piston which moves a locking element between retracted and extended positions. When in the retracted position, the locking element permits the door to move, but when in the extended position, the locking element projects into the bottom of the door, securing the same. As the piston moves upwardly and approaches its extended position, the piston uncovers a port in the cylinder so that high pressure air acting on the piston is directed to a switch which is connected to a signal at a remote location for indicating that the locking element is extended. The air cylinder is energized through a solenoid valve which is also in the floor and is in series with a door-actuated switch so that the solenoid can only be energized when the door is closed.
Inventors
- 👤 Francis C Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:41
CPC Classifications
E; E05; E05B; E05B51/00; E05B51/02; E05B63/00; E05B2063/0039; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/0999; Y10T292/1014; Y10T292/1021; Y10T70/00; Y10T70/70; Y10T70/7051
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
395 words
In combination with a movable closure structure such as a door and a surrounding structure containing an opening which is blocked by the closure structure when the closure structure is in its closed position, an improved locking device for securing the closure structure in its closed position, said locking device comprising: a fluid cylinder barrel mounted firmly on one of the structures and having a bore; a piston in the bore of the barrel and movable between the ends thereof; a locking element connected to the piston and projected through one end of the barrel, the locking element being movable with the piston between retracted and extended positions, the locking element when in its retracted position being located beyond the other structure so as not to obstruct movement of the closure structure, the locking element when in its extended position being capable of engaging said other structure to prevent movement of the closure structure away from its closed position; return means for urging the piston to the position in which the locking element is in its retracted position; a fluid line connected to a source of pressurized fluid and to the barrel for admitting the pressurized fluid to the end of the barrel so as to cause a force to be applied to the piston in the direction which moves the locking element to its extended position; an electrically operated valve in the fluid line to isolate the bore of the barrel from the source of pressurized fluid so that the return means will move the locking element to its retracted position; a pressure sensitive electrical switch communicating with the bore of the barrel intermediate the ends of the bore, the location being such that the switch is exposed to and actuated by pressurized fluid in the barrel when the locking element is in its extended position but not when it is in its retracted position, the switch controlling a signal to indicate when the locking element is extended; and electrical switch means responsive to the position of the door and connected with the electrically operated valve to prevent operation of the valve except when the closure structure is in its closed position, whereby when the bore is supplied with pressurized fluid through the electrically operated valve, the locking element will engage said other structure and prevent the closure structure from leaving its closed position.
Claim 2
Dependent Claim
395 words
In combination with a movable closure structure such as a door and a surrounding structure containing an opening which is blocked by the closure structure when the closure structure is in its closed position, an improved locking device for securing the closure structure in its closed position, said locking device comprising: a fluid cylinder barrel mounted firmly on one of the structures and having a bore; a piston in the bore of the barrel and movable between the ends thereof; a locking element connected to the piston and projected through one end of the barrel, the locking element being movable with the piston between retracted and extended positions, the locking element when in its retracted position being located beyond the other structure so as not to obstruct movement of the closure structure, the locking element when in its extended position being capable of engaging said other structure to prevent movement of the closure structure away from its closed position; return means for urging the piston to the position in which the locking element is in its retracted position; a fluid line connected to a source of pressurized fluid and to the barrel for admitting the pressurized fluid to the end of the barrel so as to cause a force to be applied to the piston in the direction which moves the locking element to its extended position; an electrically operated valve in the fluid line to isolate the bore of the barrel from the source of pressurized fluid so that the return means will move the locking element to its retracted position; a pressure sensitive electrical switch communicating with the bore of the barrel intermediate the ends of the bore, the location being such that the switch is exposed to and actuated by pressurized fluid in the barrel when the locking element is in its extended position but not when it is in its retracted position, the switch controlling a signal to indicate when the locking element is extended; and electrical switch means responsive to the position of the door and connected with the electrically operated valve to prevent operation of the valve except when the closure structure is in its closed position, whereby when the bore is supplied with pressurized fluid through the electrically operated valve, the locking element will engage said other structure and prevent the closure structure from leaving its closed position.
Claim 3
Dependent Claim
46 words
The combination according to claim 1 wherein the pressure sensitive switch communicates with the bore through a port which opens into the bore, and the piston moves past the port as the locking element goes from one of its positions to the other of its positions.
Claim 4
Dependent Claim
53 words
The combination according to claim 2 wherein the port for the fluid operated valve is exposed to and the pressure sensitive switch communicates with the bore when the locking element is in both of its positions, and the port is vented through the ore when the locking element is in its retracted position.
Claim 5
Dependent Claim
15 words
The combination according to claim 1 wherein the electrically operated valve is a solenoid valve.
Claim 6
Dependent Claim
30 words
The combination according to claim 1 wherein the bore of the barrel is vented at the end thereof which is opposite the end at which high pressure fluid is introduced.
Claim 7
Dependent Claim
29 words
The combination according to claim 1 wherein the locking device is installed at the bottom of the surrounding structure and the locking element moves upwardly to engage the door.
Claim 8
Dependent Claim
333 words
A locking device for securing a door in a closed position within a door opening bordered at its bottom by a floor, said locking device comprising: an air cylinder including a barrel mounted firmly in the floor and having an upright bore therein which is vented at its upper end and a port which opens into the bore intermediate the ends thereof, a piston movable in the bore between a lower position wherein it is below the port and an upper position wherein it is above the port, a spring for urging the piston to its lower position, and a locking rod mounted rigidly on the piston for movement through the upper end of the barrel, the locking rod being retracted below the door so as to not obstruct the door when the piston is in its lower position at the lower end of the bore and being extended to a height sufficient to engage the door and prevent the door from moving when the piston is in its upper position at the upper end of the bore; a solenoid valve connected to a source of high pressure air and to the lower end of the cylinder such that when the valve is closed the bore is vented and when the valve is opened it will direct high pressure air to the lower end of the bore and cause the piston to rise, whereby the locking rod will move upwardly to its extended position; a pressure sensitive electrical switch connected to the port and being actuated by the pressurized air once the piston rises above the port, the switch being connected to a signal which is controlled thereby; and switch means connected with the solenoid valve for sensing the position of the door and for preventing operation of the solenoid valve when the door is in any position other than its closed position, whereby the locking rod when extended will engAge the door and prevent it from moving out of its closed position.
Claim 9
Dependent Claim
333 words
A locking device for securing a door in a closed position within a door opening bordered at its bottom by a floor, said locking device comprising: an air cylinder including a barrel mounted firmly in the floor and having an upright bore therein which is vented at its upper end and a port which opens into the bore intermediate the ends thereof, a piston movable in the bore between a lower position wherein it is below the port and an upper position wherein it is above the port, a spring for urging the piston to its lower position, and a locking rod mounted rigidly on the piston for movement through the upper end of the barrel, the locking rod being retracted below the door so as to not obstruct the door when the piston is in its lower position at the lower end of the bore and being extended to a height sufficient to engage the door and prevent the door from moving when the piston is in its upper position at the upper end of the bore; a solenoid valve connected to a source of high pressure air and to the lower end of the cylinder such that when the valve is closed the bore is vented and when the valve is opened it will direct high pressure air to the lower end of the bore and cause the piston to rise, whereby the locking rod will move upwardly to its extended position; a pressure sensitive electrical switch connected to the port and being actuated by the pressurized air once the piston rises above the port, the switch being connected to a signal which is controlled thereby; and switch means connected with the solenoid valve for sensing the position of the door and for preventing operation of the solenoid valve when the door is in any position other than its closed position, whereby the locking rod when extended will engAge the door and prevent it from moving out of its closed position.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |