Detent device for locking the lid of a cassette receiving compartment of a tape recorder

• US 4,138,151 A
• Filed: 07/27/1977
• Issued: 02/06/1979
• Est. Priority Date: 07/30/1976
• Status: Expired due to Term

• Current Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Original Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Inventors: Nakao, Toshihiro
• Primary Examiner(s): Frazier, Roy D.
• Assistant Examiner(s): Lyddane, William E.
• Application Number:
  US05/819,573
• Time in Patent Office: 559 Days
• Field of Search: 292/76, 292/77, 292/80-87, 292/91, 292/17, 292/19, 292/152, 292/209, 292/303, 292/341.12, 292/341.15, 292/341.17, 292/DIG. 38, 292/DIG. 73
• US Class Current: 292/76
• CPC Class Codes: E05C 19/066 made of plastics, e.g. hook-and-loop type fastener
• CPC Class Codes: Y10S 292/38 Plastic latch parts
• CPC Class Codes: Y10T 292/088 Spring arm
• CPC Class Codes: Y10T 292/688 With silencing or anti-rattle means
• CPC Class Codes: Y10T 292/696 With movable dog, catch or striker

Abstract

A device for locking the lid of a cassette tape receiving compartment of a cassette tape recorder including a lock member projecting from a portion of the lid and a generally U-shaped lock spring provided at one end of one leg thereof with a first projection engaging the lock member of the lid during opening and closing thereof. A second projection on the one leg of the lock spring engages against a ledge formed in the recorder casing in order to modify the spring force applied by the lock spring against the lid.

Claims

1. A resilient detent device for the lid of a casing including means defining an opening with said lid being mounted on said casing to open and close said opening, said detent device comprising a generally U-shaped lock spring having a pair of resilient legs and provided near the end of one of said legs with a first projection, compartment means formed in said casing for operatively housing therein said lock spring in operative position, a lock member formed to project from a part of said lid and arranged to engage said first projection of said lock spring thereby to cause to be applied to said lid during opening and closing thereof a spring force developed by said U-shaped lock spring, a second projection formed on said one leg, and means defining a ledge in said compartment means, said second projection being engaged on said ledge against the spring force of said lock spring, with the engagement between said second projection and said ledge operating to modify the spring force applied to said lid by the engagement between said lock member and said first projection.

2. A device according to claim 1 further including a small projection located at the periphery of said opening, said small projection being arranged to be abutted by said lid when said lid is in a closed position.

3. A device according to claim 2 wherein said small projection formed at the periphery of said opening is formed as an integral part of said lock spring.