Patent US3796451A successfully refreshed from Google Patents.
US3796451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door holder with electrical control
Assignee: Eaton Corp
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Filing: 1972-04-26
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Granted: 1974-03-12
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Expires: 1992-04-26
Abstract
Abstract A door holder which is mounted on the top portion of a door frame has a controlled shaft adapted to be integrally secured to an arm of a door closer on the door, replacing the usual simple pivot on the frame. A holder lever having a considerable length rotates with the shaft and may be engaged by detent cam surfaces on a pivoted latch lever for holding the door when an electromagnet applies pressure to the latch lever. The latch lever is somewhat longer than the holder lever, and a preferred angle of the detent cam surfaces is 3* relatively to the holder lever, enabling the electromagnet to act with moderate pressure to hold the door but yielding to permit manual closing of the door. Particularly, the detent surfaces of the latch lever have reversed shapes for holding the holder lever against movement in each direction, being effective to hold the door in two positions selectively when the holder shaft is connected to a type of door closer having an arm that reverses its motion during a single closing movement of the door.
Inventors
- 👤 J Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:59
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/22; E05F3/221; E05F3/222; E05Y; E05Y2201/00; E05Y2201/40; E05Y2201/46; E05Y2201/462; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132; Y; Y10; Y10T; Y10T292/00; Y10T292/28; Y10T292/282; Y10T292/305
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
208 words
In an electric door holder, a housing mounted on a door frame, a holder lever mounted to rotate about an axis on the housing and operatively connected to the door so as to rotate incidentally to movements of the door as the door moves between an open position and a closed position, an end portion of said holder lever rotating in an arcuate path that is spaced a considerable distance relatively to the axis in which the lever rotates, a latch member having a surface movable into cam relation to said end portion of the holder lever in said arcuate path when the door is in the open position relatively to the door frame, electrically controlled means for applying to said latch member a predetermined amount of pressure to hold a surface of said latch member in said cam relation with the end portion of said holder lever thereby holding the door in the open position, and said surface of the latch member being formed at an angle that will enable the end portion of the holder lever to override the predetermined pressure applied by the electrically controlled means when a pressure sufficient to overcome the predetermined pressure applied to the lock member is applied to the door.
Claim 2
Dependent Claim
208 words
In an electric door holder, a housing mounted on a door frame, a holder lever mounted to rotate about an axis on the housing and operatively connected to the door so as to rotate incidentally to movements of the door as the door moves between an open position and a closed position, an end portion of said holder lever rotating in an arcuate path that is spaced a considerable distance relatively to the axis in which the lever rotates, a latch member having a surface movable into cam relation to said end portion of the holder lever in said arcuate path when the door is in the open position relatively to the door frame, electrically controlled means for applying to said latch member a predetermined amount of pressure to hold a surface of said latch member in said cam relation with the end portion of said holder lever thereby holding the door in the open position, and said surface of the latch member being formed at an angle that will enable the end portion of the holder lever to override the predetermined pressure applied by the electrically controlled means when a pressure sufficient to overcome the predetermined pressure applied to the lock member is applied to the door.
Claim 3
Dependent Claim
39 words
The construction set forth in claim 1 in which said latch member has a detent on said surface of said latch member for engaging the end porTion of the holder lever when the door is in the open position.
Claim 4
Dependent Claim
65 words
The construction set forth in claim 1 wherein said latch member has a first and second surface facing in opposed directions relatively to each other whereby to be effective for holding the door against movements in one direction relatively to the door frame when the holder lever is so connected to the door as to rotate in opposed directions during said movements in one direction.
Claim 5
Dependent Claim
52 words
The door holder construction set forth in claim 1, in which said latch member is a latch lever having on its medial portion the surface that moves into cam relation to the end portion of the holder lever, said electrically controlled means being connected to an end portion of said latch lever.
Claim 6
Dependent Claim
68 words
The construction set forth in claim 4 in which said latch lever has an effective length that equals at least the effective length of the holder lever, and in which said surface of the latch lever when in cam relation to the end portion of the holder lever lies at an angle in the range between 2* and 6* relatively to the longitudinal axis of the holder lever.
Claim 7
Dependent Claim
25 words
The construction set forth in claim 5 in which said electrically controlled means comprise an electromagnet and means connecting the latch lever to the electromagnet.
Claim 8
Dependent Claim
163 words
In an electric door holder, a housing mounted on a door frame, a shaft mounted on the housing and connected to the door through an arm that will rotate the shaft in a first and a second direction incidentally to movements of the door as the door moves between a closed and an open position, a holder lever mounted to rotate with said shaft, a latch member movable to position engaging said holder lever and having a first and a second detent surface for holding said lever against rotation in each of opposed directions in said housing, and electrically controlled means for holding said lever in either the first or the second detent surface thereby to hold the door in two selectively open positions, said lever being held in the first detent surface to prevent said shaft from being rotated in the first direction and being held in the second detent surface to prevent said shaft from being rotated in the second direction.
Claim 9
Dependent Claim
163 words
In an electric door holder, a housing mounted on a door frame, a shaft mounted on the housing and connected to the door through an arm that will rotate the shaft in a first and a second direction incidentally to movements of the door as the door moves between a closed and an open position, a holder lever mounted to rotate with said shaft, a latch member movable to position engaging said holder lever and having a first and a second detent surface for holding said lever against rotation in each of opposed directions in said housing, and electrically controlled means for holding said lever in either the first or the second detent surface thereby to hold the door in two selectively open positions, said lever being held in the first detent surface to prevent said shaft from being rotated in the first direction and being held in the second detent surface to prevent said shaft from being rotated in the second direction.
Claim 10
Dependent Claim
51 words
The construction set forth in claim 7 in which said latch member is a latch lever having an end portion pivoted on the casing, said detent surfaces being formed on a medial portion of the lever, and said electrically controlled means acting relatively to the opposed end portion of the lever.
Claim 11
Dependent Claim
60 words
The construction set forth in claim 8 in which said electrically controlled means apply yielding pressure to the latch member, and said detent surfaces comprise cam surfaces for engaging the holder lever and formed each at an angle that will enable the holder lever to override said yielding pressure when a predetermined amount of pressure is applied to the door.
Claim 12
Dependent Claim
71 words
The construction set forth in claim 9 in which said electrically controlled means comprise an electromagnet connected to said opposed end portion of the latch lever, said latch lever having an effective length that equals at least the effective length of the holder lever, and each of said cam surfaces when engaging the holder lever lying substantially at an angle of 3* relatively to the longitudinal axis of said holder lever.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |