US3877048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focusing device for photographic objective assemblies
Assignee: Individual
•
Filing: 1973-06-05
•
Granted: 1975-04-08
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Expires: 1993-06-05
Abstract
Abstract A device for assuring smooth movement of the part of an objective assembly, for example for reflex cameras, which is movable for focusing, thereby to achieve greater accuracy. The movable lenscarrying part of the assembly is supported on an elongated bridge mounted at its ends in guides in a frame which supports the camera.
Inventors
- 👤 Ferdinand Kellner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:21
CPC Classifications
G; G03; G03B; G03B3/00; G03B3/02; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G03B29/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
In photographic apparatus including a support frame having a hollow casing provided with a slot, a camera, and an objective assembly having an optical axis and carried by said frame and disposed in front of said camera, the improvement wherein said assembly comprises a fixed part in the form of an inner sleeve connected to said frame, the camera being mounted on the inner sleeve and a lens-carrying part in the form of an outer sleeve arranged surrounding the inner sleeve and movable relative to said fixed part for focusing purposes under the control of a hand grip, a mounting bridge movably supported in the hollow casing of the frame and provided with a neck arranged extending through the slot, said lens-carrying part being connected directly to the neck and supported by the mounting bridge, and resilient restoring means biasing the bridge, the bridge being supported on said frame for movement along the optical axis of the objective assembly against the action of resilient restoring means.
Claim 2
Dependent Claim
166 words
In photographic apparatus including a support frame having a hollow casing provided with a slot, a camera, and an objective assembly having an optical axis and carried by said frame and disposed in front of said camera, the improvement wherein said assembly comprises a fixed part in the form of an inner sleeve connected to said frame, the camera being mounted on the inner sleeve and a lens-carrying part in the form of an outer sleeve arranged surrounding the inner sleeve and movable relative to said fixed part for focusing purposes under the control of a hand grip, a mounting bridge movably supported in the hollow casing of the frame and provided with a neck arranged extending through the slot, said lens-carrying part being connected directly to the neck and supported by the mounting bridge, and resilient restoring means biasing the bridge, the bridge being supported on said frame for movement along the optical axis of the objective assembly against the action of resilient restoring means.
Claim 3
Dependent Claim
27 words
A photographic apparatus as claimed in claim 1, in which the mounting bridge is of elongated form and has ends mounted in bearings furnished in said frame.
Claim 4
Dependent Claim
35 words
A photographic apparatus as claimed in claim 2, in which the mounting bridge is a rod of polygonal cross-section, and the mounting bearings are defined by bores of coresponding polygonal cross-section provided in said frame.
Claim 5
Dependent Claim
29 words
A photographic apparatus as claimed in claim 3, in which the frame includes a housing part of hollow form, and the mounting bridge is disposed in this housing part.
Claim 6
Dependent Claim
81 words
A photographic apparatus as claimed in claim 1, in which the frame has a stock, a butt, and a hand grip depending from said stock, the stock, butt, and hand grip simulating a gun, the mounting bridge being movably mounted in said stock and having a depending operating arm adjacent said hand grip and movable towards and away from the latter by the hand of a user of the apparatus grasping depending arm for varying the focusing of the objective assembly.
Claim 7
Dependent Claim
52 words
A photographic apparatus as claimed in claim 5, in which said depending arm is bent and spaced from an end of the bridge to provide a part which extends parallel to the optical axis of the objective assembly, and this bent part passes through a guide opening provided in said hand grip.
Claim 8
Dependent Claim
41 words
A photographic apparatus as claimed in claim 6, in which the camera has a shutter, means are provided on the frame for tripping the shutter of the camera, and a trigger is provided on the frame for operating these trip means.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |