US3590233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable and replaceable insturment lamps
Assignee: Lewis Engineering Co
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Filing: 1969-11-12
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Granted: 1971-06-29
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Expires: 1989-11-12
Abstract
Abstract An indicating instrument having electric lamps disposed behind the dial and pointer, for illuminating the same. The lamps are demountably carried in an annular reflector the periphery of which extends along the inside wall of the cylindrical instrument casing. Lamp removal from the reflector is in outward directions through openings in the reflector periphery. The instrument casing is provided with corresponding or aligned access openings whereby lamp servicing can be performed without removing the annular reflector. A shallow, wide groove is provided in the casing exterior, communicating with the access openings and normally accommodating a removable cover band which closed over the openings so that the casing has a closed exterior appearance.
Inventors
- 👤 Doandl E Protzmann
- 👤 Edmund F Zawacki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:27
CPC Classifications
G; G01; G01D; G01D11/00; G01D11/28; Y; Y10; Y10S; Y10S116/00; Y10S116/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
155 words
In an illuminated instrument, in combination: a. a casing, b. an annular lampholder in the casing, having a peripheral portion extending along the interior of the casing wall, c. said peripheral portion having openings which are accessible from the exterior thereof, d. lamps and mounts therefor carried at said openings, said mountings enabling the lamps to be removed from the exterior of said peripheral holder portion, e. said casing having a relatively wide and shallow annular groove in its exterior, and having access openings which open into said groove and which register with the openings of the lampholder, f. a removable cover band disposed in said shallow annular groove of the casing and fitting substantially flush with the casing exterior, g. removal of said cover band providing access to the lamps and lamp mountings of said lampholder whereby the lamps can be readily removed and replaced without removal of the lamp holder from the casing.
Claim 2
Dependent Claim
155 words
In an illuminated instrument, in combination: a. a casing, b. an annular lampholder in the casing, having a peripheral portion extending along the interior of the casing wall, c. said peripheral portion having openings which are accessible from the exterior thereof, d. lamps and mounts therefor carried at said openings, said mountings enabling the lamps to be removed from the exterior of said peripheral holder portion, e. said casing having a relatively wide and shallow annular groove in its exterior, and having access openings which open into said groove and which register with the openings of the lampholder, f. a removable cover band disposed in said shallow annular groove of the casing and fitting substantially flush with the casing exterior, g. removal of said cover band providing access to the lamps and lamp mountings of said lampholder whereby the lamps can be readily removed and replaced without removal of the lamp holder from the casing.
Claim 3
Dependent Claim
38 words
An instrument as in claim 1 and further including: a. inwardly offset end portions on said cover band, b. said lampholder and casing having registered openings in which the offset end portions of the cover band are disposed.
Claim 4
Dependent Claim
47 words
An instrument as in claim 2, wherein: a. the end portions of the cover band are apertured, b. a fastener screw passing through the apertures of said end portions, and c. means providing a threaded hole into which the fastener screw extends, for securing the cover band.
Claim 5
Dependent Claim
98 words
An instrument as in claim 1, and further including: a. a dial disposed in the casing in front of the lampholder, b. a backplate in the casing at the rear of the lampholder, c. front and rear sealing rings engaged with the casing and the dial and backplate, to seal peripheral portions of the dial and plate to the casing, d. central annular portions of the dial and lampholder having sealing engagement, e. an annular space between the lampholder and dial being sealed from the interior of the casing, f. said lamps being carried in said annular space.
Claim 6
Dependent Claim
81 words
An instrument as in claim 1, and further including: a. a dial disposed in the casing in front of the lampholder, b. front and rear sealing means engaged with the casing and respectively with the dial periphery and rear portions of the lampholder, c. central annular portions of the dial and lampholder having sealing engagement, d. an annular space between the lampholder and dial being sealed from the interior of the casing, e. said lamps being carried in said annular space.
Claim 7
Dependent Claim
22 words
An instrument as in claim 5, wherein: a. the front sealing means comprises an O-ring carried in the periphery of the dial.
Claim 8
Dependent Claim
22 words
An instrument as in claim 4 wherein: a. the rear sealing ring comprises an O-ring carried in the periphery of the backplate.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |