US3696462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined door checking and door hold open mechanism
Assignee: Republic Industries Inc
•
Filing: 1971-01-11
•
Granted: 1972-10-10
•
Expires: 1991-01-11
Abstract
Abstract A hydraulic door checking mechanism which otherwise may be considered as of essentially conventional type is provided with a remotely actuated valve in the fluid return line from the checking cylinder to the reservoir. By closing this valve the hydraulic fluid cannot escape from the checking cylinder, thus preventing closing movement of the door from whatever position it has been opened to until the valve is unseated. Preferably, the valve is of the electromagnetic type which responds to the conditions in as associated control circuit. During opening movement of the door, the hydraulic fluid fills the checking cylinder through passages or porting which bypasses the hold open valve. The system is shown as applied to checking door hinges and to door closers of the surface mounted type.
Inventors
- 👤 Paul W Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:51
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/22; E05F3/223; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
150 words
In a hydraulic door closer system, means for biasing a door toward closure, means connected to said door providing an expansible and collapsible hydraulic chamber for restraining and controlling the rate of closure of said door, said chamber expanding upon opening said door and collapsing upon closure thereof, means providing a restricted venting passage for said hydraulic chamber, an electrically actuated valve for closing said venting passage when energized to prevent collapse of said chamber and to open said venting passage wHen deenergized, electric circuit means connected for energizing said valve to prevent escape of hydraulic fluid from said chamber to hold said door against closing under the influence of said biasing means and to deenergize said valve to permit said biasing means to collapse said chamber and close said door, and passage means for supplying hydraulic fluid to said chamber when said chamber is expanded by opening the door.
Claim 2
Dependent Claim
150 words
In a hydraulic door closer system, means for biasing a door toward closure, means connected to said door providing an expansible and collapsible hydraulic chamber for restraining and controlling the rate of closure of said door, said chamber expanding upon opening said door and collapsing upon closure thereof, means providing a restricted venting passage for said hydraulic chamber, an electrically actuated valve for closing said venting passage when energized to prevent collapse of said chamber and to open said venting passage wHen deenergized, electric circuit means connected for energizing said valve to prevent escape of hydraulic fluid from said chamber to hold said door against closing under the influence of said biasing means and to deenergize said valve to permit said biasing means to collapse said chamber and close said door, and passage means for supplying hydraulic fluid to said chamber when said chamber is expanded by opening the door.
Claim 3
Dependent Claim
82 words
The door closer system of claim 1 in which the valve is adapted to be urged in the opening direction by fluid under pressure in said chamber and to be held closed by electrical energized means with a force great enough to seal said valve against the pressure developed by said biasing means, and in which forceful closing of the door is adapted by developing an excess of pressure in said chamber to overrule said electrically energized means and open said valve.
Claim 4
Dependent Claim
22 words
The door closer system of claim 2 in which the expansible and collapsible hydraulic chamber means is a piston and cylinder combination.
Claim 5
Dependent Claim
32 words
The door closer system of claim 3 in which said electric circuit means includes switching means adapted to deenergize said valve in response to a condition present in the event of fire.
Claim 6
Dependent Claim
32 words
The door closer system of claim 2 in which said electric circuit means includes switching means adapted to deenergize said valve in response to a condition present in the event of fire.
Claim 7
Dependent Claim
22 words
The door closer system of claim 1 in which the expansible and collapsible hydraulic chamber means is a piston and cylinder combination.
Claim 8
Dependent Claim
32 words
The door closer system of claim 6 in which said electric circuit means includes switching means adapted to deenergize said valve in response to a condition present in the event of fire.
Claim 9
Dependent Claim
32 words
The door closer system of claim 1 in which said electric circuit means includes switching means adapted to deenergize said valve in response to a condition present in the event of fire.
Claim 10
Dependent Claim
153 words
In a hydraulic door closer system, means for biasing a door toward closure, means providing an expansible and collapsible hydraulic chamber for restraining and controlling the rate of closure of said door, means providing a fitting for connecting said chamber forming means and said biasing means to a door to swing said door toward closed position under the influence of said biasing means as said hydraulic chamber is collapsed and to expand said hydraulic chamber as said door is swung toward open position, means providing a fluid venting passage leading from said hydraulic chamber, an electrically actuated valve for closing said fluid venting passage to prevent collapse of said chamber or alternatively to open said fluid venting passage depending upon the state of energization of said valve, and means providing a one way filling passage connected to said chamber and oriented to supply hydraulic fluid to said chamber when said chamber is expanded.
Claim 11
Dependent Claim
153 words
In a hydraulic door closer system, means for biasing a door toward closure, means providing an expansible and collapsible hydraulic chamber for restraining and controlling the rate of closure of said door, means providing a fitting for connecting said chamber forming means and said biasing means to a door to swing said door toward closed position under the influence of said biasing means as said hydraulic chamber is collapsed and to expand said hydraulic chamber as said door is swung toward open position, means providing a fluid venting passage leading from said hydraulic chamber, an electrically actuated valve for closing said fluid venting passage to prevent collapse of said chamber or alternatively to open said fluid venting passage depending upon the state of energization of said valve, and means providing a one way filling passage connected to said chamber and oriented to supply hydraulic fluid to said chamber when said chamber is expanded.
Claim 12
Dependent Claim
22 words
The door closer system of claim 9 in which the expansible and collapsible hydraulic chamber means is a piston and cylinder combination.
Claim 13
Independent Claim
151 words
A system for holding a swinging door stationary in any desired position within its total arc of swing or optionally for closing said door comprising biasing means connected for tending to swing the door toward closed position, a hydraulic door check including a cylinder and piston combination and means defining a restricted passage to limit the rate of escape of fluid ahead of said piston in the door-closing direction of travel, associated with said biasing means to control the rate of closure of said door, valve means for closing said passage to prevent the flow of fluid therethrough, electrically energized valve operating means connected for preventing closing movement of the door or alternatively for freeing the door for closing under the influence of said biasing means depending upon the state of energization of said valve operating means, and electrical circuit means connected for oprationally energizing or de-energizing said valve operating means.
Claim 14
Independent Claim
151 words
A system for holding a swinging door stationary in any desired position within its total arc of swing or optionally for closing said door comprising biasing means connected for tending to swing the door toward closed position, a hydraulic door check including a cylinder and piston combination and means defining a restricted passage to limit the rate of escape of fluid ahead of said piston in the door-closing direction of travel, associated with said biasing means to control the rate of closure of said door, valve means for closing said passage to prevent the flow of fluid therethrough, electrically energized valve operating means connected for preventing closing movement of the door or alternatively for freeing the door for closing under the influence of said biasing means depending upon the state of energization of said valve operating means, and electrical circuit means connected for oprationally energizing or de-energizing said valve operating means.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |