Clutch employing constant force springs
Automatic system and interchangeable optical instrument therefor
Optical unit Patent #: 4564265
ApplicationNo. 06/767460 filed on 08/20/1985
US Classes:359/827, Detachably attached (e.g., plate, barrel, etc.)192/69.8, Axial-axial192/69.82, Square tooth403/300DISTINCT END COUPLER
ExaminersPrimary: Punter, William H.
Attorney, Agent or Firm
International ClassesF16D 1/10 (20060101)
G03B 17/14 (20060101)
G03B 17/12 (20060101)
F16D 1/00 (20060101)
Foreign Application Priority Data1984-08-24 JP
AbstractA drive coupling device for transmitting a rotational drive force from an optical instrument such as a camera body to another optical instrument such as an exchangeable lens has a construction which couples driving and driven coupling members steadily while centerizing the center axes of the driving and driven coupling members for efficient drive force transmission. A flat male engaging portion having a top surface and parallel side walls is formed on the driving coupling member while a slotted female engaging portion having a concave bottom wall and parallel side walls is formed on the driven coupling member. With the optical instruments connected to each other, the male engaging portion is brought into engagement with the female engaging portion under a force of a spring.