Patent US3729771A successfully refreshed from Google Patents.
US3729771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latching lever assembly for door holder-closer
Assignee: Rixson Firemark Inc
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Filing: 1972-03-01
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Granted: 1973-05-01
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Expires: 1992-03-01
Abstract
Abstract An improved latching lever assembly for use in an electromechanical door holder-closer having a closer spring, a dashpot, and an electromagnet. The electromagnet actuates the lever assembly to latch the spring-dashpot combination to effect a desired door hold open position. The lever assembly comprises a lever, a fulcrum at one end of the lever, and an armature located generally at the other end of the lever and electromagnetically coupled to the electromagnet. A latching detent is located on the lever intermediate the fulcrum and armature to latch a camming roller to arrest the spring-dashpot combination when the electromagnet is energized. An armature-lever coupling spring resiliently couples the armature to the lever to enable the lever to pivot about its fulcrum during manual override of the door holder-closer without a corresponding movement of the armature relative the energized electromagnet, thereby eliminating armature release noises.
Inventors
- 👤 B Crane
- 👤 Hooge R D
- 👤 F Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:05
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/22; E05F3/221; E05F3/222; E05F2003/228; E05Y; E05Y2201/00; E05Y2201/40; E05Y2201/46; E05Y2201/462; E05Y2201/47; E05Y2201/474; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/1043; Y10T292/1075; Y10T292/1082
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
In an electromechanical door holder-closer having a closer spring, a dashpot and an electromagnet actuating a latching lever assembly to latch the spring-dashpot combination to effect a desired door hold-open position, the improved latching lever assembly comprising a lever, a fulcrum located generally at one end of the lever, an armature located generally at the other end of the lever and electromagnetically coupled to the electromagnet, and a latching element coupled to the lever intermediate the fulcrum and armature to latch the spring-dashpot combination when the electromagnet is energized.
Claim 2
Dependent Claim
89 words
In an electromechanical door holder-closer having a closer spring, a dashpot and an electromagnet actuating a latching lever assembly to latch the spring-dashpot combination to effect a desired door hold-open position, the improved latching lever assembly comprising a lever, a fulcrum located generally at one end of the lever, an armature located generally at the other end of the lever and electromagnetically coupled to the electromagnet, and a latching element coupled to the lever intermediate the fulcrum and armature to latch the spring-dashpot combination when the electromagnet is energized.
Claim 3
Dependent Claim
44 words
The combination of claim 1 in which a door standard arm is adapted to couple door movements responsively to the door holder-closer to effect a manual override of the lever in its latching position by application of a releasing force to the latching element.
Claim 4
Dependent Claim
50 words
The combination of claim 2 in which an armature-lever coupling spring resiliently couples the armature to the lever which enables the lever to pivot about its fulcrum during manual override of the door holder-closer without a corresponding movement of the armature relative the energized electromagnet thereby eliminating armature release noises.
Claim 5
Dependent Claim
41 words
The combination of claim 3 in which the armature is electromagnetically fixed to the energized electromagnet during manual override with the adjacent end of the lever moving away from the armature to enable the latching element to release the spring-dashpot combination.
Claim 6
Dependent Claim
30 words
The combination of claim 4 in which the armature-lever coupling spring resiliently biases the armature to a normal position in direct contact with the adjacent end of the coupled lever.
Claim 7
Dependent Claim
37 words
The combination of claim 5 in which a lever assembly biasing spring normally urges the lever assembly about the lever fulcrum so the armature makes contact with the electromagnet irrespective of the energized condition of the electromagnet.
Claim 8
Dependent Claim
50 words
The combination of claim 6 in which the spring-dashpot combination drives a cam element into latching engagement with the latching element to effect a door hold when the electromagnet is energized and in which the cam element pivots both the lever and armature in unison when the electromagnet is deenergized.
Claim 9
Dependent Claim
42 words
The combination of claim 7 in which the dashpot includes an internal stator and an external rotor with the rotor moving responsively to various door open positions and in which the cam element is supported by the rotor to move responsively therewith.
Claim 10
Dependent Claim
22 words
The combination of claim 8 in which the cam element is a roller and the lever latching element is a projecting detent.
Claim 11
Dependent Claim
70 words
The combination of claim 9 in which the end of the lever adjacent the armature is formed into a yoke, and in which the armature-lever coupling spring is a helically wound torsion spring formed into two divided and joined sections having a central spring connector element and two end connector elements with the armature fixed to the central spring connector element and the yoke fixed to both end connector elements.
References Cited (Backward Citations)
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Cited
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FR891087A
Cited
US2754144A
Cited
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US3648326A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |