US3909051A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Narrow profile door latch
Assignee: Miwa Lock Co Ltd
•
Filing: 1974-04-05
•
Granted: 1975-09-30
•
Expires: 1994-04-05
Abstract
Abstract A door latch without outwardly projecting knobs or the like is comprised of a normally extended bolt which is longitudinally retractable by an actuator having generally disc-like inner and outer housings mountable on the door with their outer surfaces essentially faired with those of the door. The inner and outer actuator housings include outwardly opening recesses into which a hand is insertable to engage longitudinally movable vertical pusher bars positioned therein for retractively moving the bolt. A pivotal lock member rotatively supported from the inner housing is provided to lock the latch from the inside of the door; but can be moved to unlock the latch from both sides thereof.
Inventors
- 👤 Ikuo Nakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:40
CPC Classifications
E; E05; E05C; E05C1/00; E05C1/08; E05C1/12; E05C1/16; E05C1/166; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/0969; Y10T292/097; Y10T292/0972; Y10T292/1014; Y10T292/1022; Y10T292/1031; Y10T292/57
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
199 words
A door latch having a selectively retractable, normally extended bolt, comprising: inner and outer housings respectively mounted within the inside and outside surfaces of the door, the exterior surfaces of the inner and outer housings being essentially faired, respectively, with the inside and outside surfaces of the door; the inner housing defining an inner recess into which a hand or similar object is insertable, the recess opening transversely outwardly from the inside of the door; an inner elongated pusher element positioned vertically within the inner recess and reciprocatively movable therein in a forward direction and in a reverse direction; the outer housing defining an outer recess into which a hand or similar object is insertable, the outer recess opening transversely outwardly from the outside of the door; an outer elongated pusher element positioned vertically within the outer recess and reciprocatively movable therein in a forward direction and in a reverse direction; means connecting the inner and outer pusher elements with the bolt for retractively moving the bolt in response to forward movement of the pusher elements, said means permitting said bolt to advance to a door jam engaging position upon movement of said pusher elements in said reverse direction.
Claim 2
Dependent Claim
199 words
A door latch having a selectively retractable, normally extended bolt, comprising: inner and outer housings respectively mounted within the inside and outside surfaces of the door, the exterior surfaces of the inner and outer housings being essentially faired, respectively, with the inside and outside surfaces of the door; the inner housing defining an inner recess into which a hand or similar object is insertable, the recess opening transversely outwardly from the inside of the door; an inner elongated pusher element positioned vertically within the inner recess and reciprocatively movable therein in a forward direction and in a reverse direction; the outer housing defining an outer recess into which a hand or similar object is insertable, the outer recess opening transversely outwardly from the outside of the door; an outer elongated pusher element positioned vertically within the outer recess and reciprocatively movable therein in a forward direction and in a reverse direction; means connecting the inner and outer pusher elements with the bolt for retractively moving the bolt in response to forward movement of the pusher elements, said means permitting said bolt to advance to a door jam engaging position upon movement of said pusher elements in said reverse direction.
Claim 3
Dependent Claim
49 words
The door latch according to claim 1, wherein the inner and outer recesses further extend forwardly of the door and respectively terminate in vertically elongated rearwardly opening inner and outer pockets, and wherein the inner and outer pusher elements are respectively vertically positioned within the inner and outer pockets.
Claim 4
Dependent Claim
54 words
The door latch according to claim 2, wherein the inner and outer pockets are defined by, respectively, inner and outer vertical elongated finger plates projecting rearwardly from the exterior forward surfaces, respectively, of the inner and outer housings and parallel thereto, the finger plates extending rearwardly, respectively, of the inner and outer pusher elements.
Claim 5
Dependent Claim
82 words
The door latch according to claim 1, wherein the connecting means comprises inner and outer elongated connecting elements extending, respectively, from the inner and outer pusher elements and movable conjointly therewith, a second elongated connecting element extending rearwardly from the bolt and movable conjointly therewith, and rotatively movable coupling means alternately rotatively coupling together the second connecting element with the inner and outer connecting elements for retractively moving the bolt in response to forward movement of the inner and outer pusher elements.
Claim 6
Dependent Claim
110 words
The door latch according to claim 4, wherein the second connecting element terminates at its rear end in first and second projections extending perpendicularly to its length, and wherein the coupling means includes first and second pivotal members each having forward and rear ends, means for rotatively supporting The pivotal members intermediate their forward and rear ends for rotative movement about axes extending transversely to the length of the second connecting element, the forward ends of the first and second pivotal members being engageable, respectively, with the first and second projections, the rear ends of the first and second pivotal members being engageable with the inner and outer connecting elements.
Claim 7
Dependent Claim
22 words
The door latch according to claim 1, including means for normally biasing the inner and outer pusher elements in the reverse direction.
Claim 8
Dependent Claim
44 words
The latch according to claim 1, including means for locking the latch comprising: an elongated locking member selectively alternately engageable with the connecting means to prevent retractive movement of the bolt and disengageable from the connecting means to permit retractive movement of the bolt.
Claim 9
Dependent Claim
71 words
The door latch according to claim 7, wherein the locking means further includes means for rotatively supporting the locking member intermediate its ends from the inner housing, the locking member being rotatively movable about a horizontal axis extending longitudinally of the door, the locking member having an inwardly projecting shoulder, the shoulder alternately being engageable with the connecting means and disengageable therefrom in response to rotative movement of the locking member.
Claim 10
Dependent Claim
26 words
The door latch according to claim 8, wherein the outer ends of the locking member alternately project transversely outwardly from the side of the inner housing.
Claim 11
Dependent Claim
20 words
The door latch according to claim 8, wherein the outer housing includes an aperture transversely opposite the inwardly projecting shoulder.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |