US4403276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Front loading projection unit with snap in capsule
Assignee: Ledvance LLC
•
Filing: 1980-12-03
•
Granted: 1983-09-06
•
Expires: 2000-12-03
Abstract
Abstract An improved projection unit which enables front removal of the unit's tungsten halogen projection lamp from the unit's glass reflector. A first retention means in the form of a boxlike metallic "can" is secured to the lamp's press-sealed end and held in place by a pair of depressible, cantilever springs, each of which is secured to opposing sides of the metallic can and capable of being depressed to enable insertion and removal of the lamp and can components. At full insertion of the lamp, each spring deflects to an expanded position to engage the reflector's neck and provide the desired retention.
Inventors
- 👤 Ronald G. Blaisdell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:43
CPC Classifications
F; F21; F21V; F21V19/00; F21V19/0005; G; G03; G03B; G03B21/00; G03B21/14; G03B21/20; G03B21/2046
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
281 words
In a projection unit including a glass reflector having a front concave reflecting portion and a rear neck portion having a substantially rectangular opening therein, an incandescent lamp including an envelope portion and a sealed end adjacent said envelope portion, first retention means of a substantially boxlike configuration secured to said sealed end of said lamp for retaining said lamp therein and aligning said lamp within said reflector whereby said envelope portion will be positioned substantially within said front concave reflecting portion and said sealed end will be positioned substantially within said substantially rectangular opening within said rear neck portion, said substantially boxlike first retention means removably positioned within said opening and adapted for being removed through said front concave reflecting portion of said reflector, and second retention means for retaining said first retention means within said substantially rectangular opening of said reflector and permitting removal thereof through said front concave reflecting portion, the improvement where said substantially rectangular opening includes a longitudinal slot within a surface thereof and said second retention means comprises at least one depressible, cantilever spring secured at one end thereof to said substantially boxlike first retention means, said cantilever spring including an angular engaging portion for moving within said longitudinal slot during insertion and removal of said first retention means and capable of being depressed to a first position to enable said insertion and removal, said cantilever spring releasing to a second, expanded position such that said angular engaging portion engages an edge of said rear neck portion of said reflector when said first retention means is fully inserted within said substantially rectangular opening to effect said retention of said first retention means within said opening.
Claim 2
Dependent Claim
281 words
In a projection unit including a glass reflector having a front concave reflecting portion and a rear neck portion having a substantially rectangular opening therein, an incandescent lamp including an envelope portion and a sealed end adjacent said envelope portion, first retention means of a substantially boxlike configuration secured to said sealed end of said lamp for retaining said lamp therein and aligning said lamp within said reflector whereby said envelope portion will be positioned substantially within said front concave reflecting portion and said sealed end will be positioned substantially within said substantially rectangular opening within said rear neck portion, said substantially boxlike first retention means removably positioned within said opening and adapted for being removed through said front concave reflecting portion of said reflector, and second retention means for retaining said first retention means within said substantially rectangular opening of said reflector and permitting removal thereof through said front concave reflecting portion, the improvement where said substantially rectangular opening includes a longitudinal slot within a surface thereof and said second retention means comprises at least one depressible, cantilever spring secured at one end thereof to said substantially boxlike first retention means, said cantilever spring including an angular engaging portion for moving within said longitudinal slot during insertion and removal of said first retention means and capable of being depressed to a first position to enable said insertion and removal, said cantilever spring releasing to a second, expanded position such that said angular engaging portion engages an edge of said rear neck portion of said reflector when said first retention means is fully inserted within said substantially rectangular opening to effect said retention of said first retention means within said opening.
Claim 3
Dependent Claim
150 words
The improvement according to claim 1 wherein said substantially rectangular opening further includes a second longitudinal slot within a second surface thereof, said second retention means further including a second depressible, cantilever spring, said second cantilever spring secured at one end thereof to a second, opposed surface of said substantially boxlike first retention means from the first cantilever spring and including an angular engaging portion, said second cantilever spring moving within said second longitudinal slot during said insertion and removal of said first retention means and capable of being depressed to a first position to enable said insertion and removal, said second cantilever spring releasing to a second, expanded position such that said angular engaging portion engages an opposite edge of said rear neck portion of said reflector from said edge engaged by the first cantilever spring when said first retention means is fully inserted within said substantially rectangular opening.
Claim 4
Dependent Claim
90 words
The improvement according to claim 2 wherein said substantially rectangular opening within said rear neck portion of said glass reflector includes first and second grooves located within opposed surfaces thereof, and said substantially boxlike first retention means includes first and second upstanding segments thereon, each of said upstanding segments projecting from a respective one of said opposed surfaces of said first retention means for aligning with and being located within a respective one of said grooves when said substantially boxlike first retention means is positioned within said substantially rectangular opening.
Claim 5
Dependent Claim
72 words
The improvement according to claim 3 further including a third groove within one of said opposed surfaces of said opening, said first retention member further including a third upstanding segment thereon projecting from one of said surfaces of said substantially boxlike first retention means adjacent said second upstanding segment for aligning with and for being located within said third groove when said substantially boxlike first retention means is positioned within said opening.
Claim 6
Dependent Claim
16 words
The improvement according to claim 1 wherein said depressible spring is of a thin, metallic material.
Claim 7
Dependent Claim
15 words
The improvement according to claim 5 wherein said metallic material of said spring is steel.
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) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |