Device for protecting the operating section of a camera from water drops and dust

• US 4,244,591 A
• Filed: 09/11/1979
• Issued: 01/13/1981
• Est. Priority Date: 05/30/1977
• Status: Expired due to Term

• Current Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
• Original Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
• Inventors: Umetsu, Junji
• Primary Examiner(s): Ward, Jr., Robert S.
• Application Number:
  US06/074,273
• Time in Patent Office: 490 Days
• Field of Search: 277/12, 277/50, 277/92, 277/95, 277/167.5, 277/171, 277/212 F, 352/174, 354/64, 354/266
• US Class Current: 277/436
• CPC Class Codes: F16J 15/3228 formed by deforming a flat ring
• CPC Class Codes: G03B 17/08 Waterproof bodies or housings

Abstract

Water- and dust-proof connections between movable components mounted externally on a camera and the camera casing are achieved by using a viscoelastic sheet inserted at one end into either the component or casing and frictionally engaging the other to provide the leak-proof seal.

Claims

1. A seal for protecting the interior of a camera from water drops and dust, said seal of the type comprising an external casing member of said camera, an operating member outside of said casing member for controlling a camera function, said operating member passing through an opening in said external casing member to form a gap therebetween, and a sealing means for sealing said gap, wherein the improvement comprises:

said sealing means comprising a viscoelastic sheet, having a substantially rectangular cross-section and an axial thickness which is small in relation to its radial thickness, fixedly secured to one of said members and tightly contacting the entire periphery of the other of said members around the entire periphery of said other member within said gap.

2. A seal as claimed in claim 1, wherein said operating member includes a shaft and wherein said sealing means is an annular viscoelastic sheet fixed at its outer diameter to the camera casing and having an inner diameter in its unstressed state which is slightly smaller than the diameter of said shaft.

3. A seal as claimed in claim 1, wherein said sealing means is an annular viscoelastic sheet fixed at its inner periphery to said operating member and having an outer diameter, in its unstressed state, larger than the inner diameter of the opening.

4. A seal as claimed in claims 1, 2 or 3, wherein said operating member is axially movable.

5. A seal as claimed in claims 1 or 2, wherein said operating member is rotatable.