Patent US3645573A successfully refreshed from Google Patents.
US3645573A
Expired / Lapsed
US
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Window lock
Assignee: INJECTION PLASTIC CO Inc
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Filing: 1969-12-11
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Granted: 1972-02-29
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Expires: 1989-12-11
Abstract
Abstract A lock for a window of the type having upper and lower vertically sliding sections with frame members at the lower and upper edge, respectively, the lock including a lug member with an inwardly facing shoulder for one window section and an element having an eccentric edge for engaging the shoulder for the other of the window sections. The parts are constructed of a firm but resilient plastic material which offers sufficient yieldability to cause the window to stay firmly locked and to compensate for changes in temperature and moisture without becoming unlatched or loose. A single screw is used to attach the element with the eccentric edge and an insert is preferably used to retain the elements of a base member in place.
Inventors
- 👤 Robert E Strang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:54
CPC Classifications
E; E05; E05C; E05C3/00; E05C3/02; E05C3/04; E05C3/041; E05C3/046; Y; Y10; Y10S; Y10S292/00; Y10S292/38; Y10T; Y10T292/00; Y10T292/08; Y10T292/1039; Y10T292/1041; Y10T292/88
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
139 words
A lock for a double-hung window comprising a lug part composed of resilient plastic material and having an upstanding member with an inwardly facing shoulder thereon, a rotary part having a base and an element of resilient plastic material with an inclined eccentric edge for engaging said inwardly facing shoulder, securing means for pivotally connecting said element to said base for rotary movement thereon, including an enlarged hole in said element and a recess in said base, an insert with a cylindrical extension projecting through said hole and seating in said recess to retain said element and said base together, and an operating handle on said element at the higher end of said inclined edge, said plastic parts being sufficiently inherently resilient to compensate for charGes in temperature and moisture to maintain a secure interlocking action between said parts.
Claim 2
Dependent Claim
139 words
A lock for a double-hung window comprising a lug part composed of resilient plastic material and having an upstanding member with an inwardly facing shoulder thereon, a rotary part having a base and an element of resilient plastic material with an inclined eccentric edge for engaging said inwardly facing shoulder, securing means for pivotally connecting said element to said base for rotary movement thereon, including an enlarged hole in said element and a recess in said base, an insert with a cylindrical extension projecting through said hole and seating in said recess to retain said element and said base together, and an operating handle on said element at the higher end of said inclined edge, said plastic parts being sufficiently inherently resilient to compensate for charGes in temperature and moisture to maintain a secure interlocking action between said parts.
Claim 3
Dependent Claim
47 words
A lock for a window as defined in claim 1 in which said lug part and said element are composed of a strong relatively rigid but resilient plastic material capable of yielding without becoming unlatched from one another in response to changes in temperature and moisture condition.
Claim 4
Dependent Claim
28 words
A lock for a window as defined in claim 1 in which said base of said rotary part is constructed of the same plastic material as said element.
Claim 5
Dependent Claim
31 words
A lock for a window as defined in claim 1 in which a single screw secures said element and base together and said element and base to said upper frame member.
Claim 6
Dependent Claim
54 words
A lock for a window as defined in claim 1 in which a center hole is provided in said insert and a screw extends downwardly through said insert, element and base into said upper frame member for securing the aforesaid element, insert, and base together and said rotary part to said upper frame member.
Claim 7
Dependent Claim
27 words
A lock for a window as defined in claim 1 in which said base member is provided with downwardly extending spurs for preventing rotation of said base.
Claim 8
Dependent Claim
33 words
A lock for a window as defined in claim 5 in which said base member is provided with at least one downwardly extending spur for preventing rotation of said base about said screw.
Claim 9
Dependent Claim
28 words
A lock for a window as defined in claim 7 in which said base and insert are composed of the same kind of plastic material as said element.
Claim 10
Dependent Claim
20 words
A lock for a window as defined in claim 1 in which said plastic parts are constructed of acetal resin.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |