Patent US3653754A successfully refreshed from Google Patents.
US3653754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overhead projector
Assignee: CABIN KOGYO KK
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Filing: 1969-12-29
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Granted: 1972-04-04
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Expires: 1989-12-29
Abstract
Abstract An overhead projector having an arrangement comprising a body casing containing a light source means, a cooling means and openable stage means mounted by a Fresnel lens, and collapsible supporting means for supporting a projection head, both of said collapsible supporting means and said projection head being adapted to be accommodated within the space in said body casing, and means capable of cutting off the power source circuit as said stage means is opened.
Inventors
- 👤 Einemi Yamanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:57
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; Y; Y10; Y10S; Y10S353/00; Y10S353/03
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
218 words
An overhead projector comprising a body casing containing a light source means and a cooling means, a stage means openably mounted to said body casing and capable of closing the top opening of said body casing, a supporting means for a projection head, said supporting means being tiltably mounted to said body casing and being adapted to be housed in the space within said body casing, a locking means for retaining said supporting means in its erect position, and a projection head supported by said supporting means and capable of being housed in the space within said body casing together with said supporting means and in which said cooling means comprises a fan arranged adjacent to said light source means, a window formed in a side wall of said body casing for introducing external air into said body casing, a deflecting panel attached to a side wall of said body casing in adjacent relation with said window and capable of directing the air introduced from said window to said Fresnel lens, and a duct formed in a side wall of said body casing and capable of sucking the air present in the vicinity of said light source means and also capable of leading the same to an air-discharging window fromed in a side wall of said body casing.
Claim 2
Dependent Claim
218 words
An overhead projector comprising a body casing containing a light source means and a cooling means, a stage means openably mounted to said body casing and capable of closing the top opening of said body casing, a supporting means for a projection head, said supporting means being tiltably mounted to said body casing and being adapted to be housed in the space within said body casing, a locking means for retaining said supporting means in its erect position, and a projection head supported by said supporting means and capable of being housed in the space within said body casing together with said supporting means and in which said cooling means comprises a fan arranged adjacent to said light source means, a window formed in a side wall of said body casing for introducing external air into said body casing, a deflecting panel attached to a side wall of said body casing in adjacent relation with said window and capable of directing the air introduced from said window to said Fresnel lens, and a duct formed in a side wall of said body casing and capable of sucking the air present in the vicinity of said light source means and also capable of leading the same to an air-discharging window fromed in a side wall of said body casing.
Claim 3
Dependent Claim
74 words
An overhead projector according to claim 1, in which said body casing is provided with a switch means capable of being actuated interlockingly with the opening and closing movements of said stage means and capable of opening the circuit for supplying power to said light source means and also to said cooling means as said stage means is opened and also capable of closing said power supply circuit as said stage means is closed.
Claim 4
Dependent Claim
201 words
An overhead projector comprising a body casing containing a light source means and a cooling means, a stage means openably mounted to said body casing and capable of closing the top opening of said body casing, a supporting means for a projection head, said supporting means being tiltably mounted to said body casing and being adapted to be housed in the space within said body casing, a locking means for retaining said supporting means in its erect position, and a projection head supported by said supporting means and capable of being housed in the space within said body casing together with said supporting means and in which said supporting means comprises a strut pivotably attached to the body casing, a first supporting arm inserted in said strut for vertical movement via a coupling frame formed in the bottom portion of said first supporting arm, and a second supporting arm having a base portion pivotably and fastenably attached to the foremost end portion of said first supporting arm and also having a projection head fastenably and pivotably attached to the foremost end of said second supporting arm and in which said strut is provided with a key formed circumferentially and longitudinally thereof.
Claim 5
Dependent Claim
201 words
An overhead projector comprising a body casing containing a light source means and a cooling means, a stage means openably mounted to said body casing and capable of closing the top opening of said body casing, a supporting means for a projection head, said supporting means being tiltably mounted to said body casing and being adapted to be housed in the space within said body casing, a locking means for retaining said supporting means in its erect position, and a projection head supported by said supporting means and capable of being housed in the space within said body casing together with said supporting means and in which said supporting means comprises a strut pivotably attached to the body casing, a first supporting arm inserted in said strut for vertical movement via a coupling frame formed in the bottom portion of said first supporting arm, and a second supporting arm having a base portion pivotably and fastenably attached to the foremost end portion of said first supporting arm and also having a projection head fastenably and pivotably attached to the foremost end of said second supporting arm and in which said strut is provided with a key formed circumferentially and longitudinally thereof.
Claim 6
Dependent Claim
44 words
An overhead projector according to claim 3, in which said first supporting arm is provided, at the foremost end portion thereof, with a pair of stopper means for limiting the range of movement of said second supporting arm relative to said first supporting arm.
Claim 7
Dependent Claim
41 words
An overhead projector according to claim 3, in which said projection head is provided, on the side panel thereof, with a pair of stopper means for limiting the range of movement of said projection head relative to said second supporting arm.
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |