US3655230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door latch
Assignee: Decalock Ltd
•
Filing: 1970-09-25
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Granted: 1972-04-11
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Expires: 1990-09-25
Abstract
Abstract A door latch which can be mounted on doors of different thicknesses and at either side edge of a door without requiring any adjustment or modification of the latch includes a pair of pivotally mounted handles, each of which has a stem which extends inwardly into an opening provided in the door. A cam member is operatively associated with a latch bolt disposed in a passage extending from a side edge of the door inwardly therefrom and such cam member is in turn operatively associated with another cam member which undergoes generally translational movement within the door when either of the handles is pivoted about its pivot axis, each such axis being disposed generally parallel to the latch bolt passage.
Inventors
- 👤 Richard James Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:15
CPC Classifications
E; E05; E05C; E05C1/00; E05C1/08; E05C1/12; E05C1/14; Y; Y10; Y10S; Y10S292/00; Y10S292/31; Y10S292/38; Y10S292/53; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/0969; Y10T292/097; Y10T292/0976; Y10T292/0977; Y10T292/57
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
305 words
A latch for use in a door having a first face, a second face generally parallel to said first face, a side edge extending between said first and second faces, an opening extending through said door between said first and second faces thereof generally perpendicularly to said first and second faces of said door, and a passage extending from said side edge of said door into said opening, which latch comprises: a pair of handle-mounting members each adapted to be secured in position about said opening extending through said door at a respective one of said first and second faces of said door; first and second handles pivotally mounted on respective ones of said handle-mounting members about axes generally parallel to said passage in said door and each said handle having an elongated stem adapted to extend into said opening in said door; a latch bolt adapted to be guided in said passage in said door for movement between an extended door-latching position and a retracted door-unlatching position; a first cam member operatively associated with said latch bolt for axial movement therewith along said passage; a second cam member operatively associated with said elongated stems of said first and second handles and adapted to be disposed in said opening in said door in engagement with said first cam member for generally translational movement of said second cam member in a cam plane disposed intermediate said first and second faces of said door and generally parallel thereto in response to pivotal movement of said first and second handles to move said latch bolt between said doorlatching and door-unlatching positions; and a spring means biassing said latch bolt into said door-latching position, whereby said latch bolt is moved from said doorlatching position into said door-unlatching position on pivoting movement of either of said handles about their axes.
Claim 2
Dependent Claim
305 words
A latch for use in a door having a first face, a second face generally parallel to said first face, a side edge extending between said first and second faces, an opening extending through said door between said first and second faces thereof generally perpendicularly to said first and second faces of said door, and a passage extending from said side edge of said door into said opening, which latch comprises: a pair of handle-mounting members each adapted to be secured in position about said opening extending through said door at a respective one of said first and second faces of said door; first and second handles pivotally mounted on respective ones of said handle-mounting members about axes generally parallel to said passage in said door and each said handle having an elongated stem adapted to extend into said opening in said door; a latch bolt adapted to be guided in said passage in said door for movement between an extended door-latching position and a retracted door-unlatching position; a first cam member operatively associated with said latch bolt for axial movement therewith along said passage; a second cam member operatively associated with said elongated stems of said first and second handles and adapted to be disposed in said opening in said door in engagement with said first cam member for generally translational movement of said second cam member in a cam plane disposed intermediate said first and second faces of said door and generally parallel thereto in response to pivotal movement of said first and second handles to move said latch bolt between said doorlatching and door-unlatching positions; and a spring means biassing said latch bolt into said door-latching position, whereby said latch bolt is moved from said doorlatching position into said door-unlatching position on pivoting movement of either of said handles about their axes.
Claim 3
Dependent Claim
79 words
A latch as claimed in claim 1 in which each of said handle-mounting members includes an anchoring portion adapted to be received within said opening in said door and a shoulder adapted to abut a respective one of said first and second faces of said door and which latch additionally comprises a fastening means adapted to interconnect said handle-mounting members to maintain said shoulders thereof in abutment with respective ones of said first and second faces of said door.
Claim 4
Dependent Claim
59 words
A latch as claimed in claim 2 in which said latch bolt is slidably disposed in a guide sleeve adapted to be secured in said passage in said door and in which said anchoring portions of said handle-mounting members extend inwardly through said opening in said door to engage said guide sleeve to prevent rotation of said handle-mounting members.
Claim 5
Dependent Claim
89 words
A latch as claimed in claim 3 in which each of said first and second handles is pivotally mounted on a respective one of said handle-mounting members by axially aligned pivot pins adapted to be disposed outwardly of the respective one of said first and second faces of said door to extend through aligned openings through said handle-mounting member, through said elongated stem of said handle and through a pair of ears secured to said handle and axially spaced apart from said elongated stem thereof along said pivot pins.
Claim 6
Dependent Claim
43 words
A latch as claimed in claim 4 in which said handles and said handle-mounting members are formed from a plastics material and in which each of said first and second handles comprises a cross-head integrally formed with said elongated stem of that handle.
Claim 7
Dependent Claim
31 words
A latch as claimed in claim 5 in which said cross-head of each said handle has a peripheral flange with a face panel secured on said cross-head within said peripheral flange.
Claim 8
Dependent Claim
62 words
A latch as claimed in claim 1 in which said second cam member is integrally formed with said elongated stem of said first handle and in which said second cam member has two opposed cam surfaces adapted alternatively to engage said first cam member whereby said first handle may be mounted on either of said first and second faces of said door.
Claim 9
Dependent Claim
47 words
A latch as claimed in claim 7 in which said first cam member includes an elongated slot adapted to be disposed axially within said passage in said door and in which said second cam member is adapted to extend into said elongated slot for cam action therewith.
Claim 10
Dependent Claim
55 words
A latch as claimed in claim 8 in which said second cam member and said elongated slot of said first cam member are so dimensioned that said second cam member may be introduced into said elongated slot of said first cam member by manual rotation of said latch bolt within said passage in said door.
Claim 11
Dependent Claim
49 words
A latch as claimed in claim 1 in which said first and second cam members are adapted for co-engagement over a predetermined transverse distance between said first and second faces of said door whereby said latch can be used on doors having thicknesses within a predetermined range of values.
Claim 12
Dependent Claim
115 words
A latch as claimed in claim 10 in which said second cam member is integrally formed with said elongated stem of said first handle and extends through an elongated slot in said first cam member for cam action therewith, in which said elongated slot has a finite width between said first and second faces of said door whereby said second cam member can engage said first cam member at different transverse positions in said elongated slot in accordance with the thickness of said door, and in which said elongated stems of said first and second handles co-engage in a sliding pivotal interfit within said opening in said door to permit pivotal movement of said handles.
Claim 13
Dependent Claim
66 words
A latch as claimed in claim 11 in which said sliding pivotal interfit is formed by a channel defined by side walls provided at the end of said elongated stem of one of said handles, said side walls having confronting grooves in their opposed surfaces, and by pins on said elongated stem of the other of said handles, said pins being slidably received within said grooves.
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |