Drive coupling device for optical instruments
Patent 4711528 Issued on December 8, 1987. Estimated Expiration Date: 
August 20, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 20, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1012657 1241713 3212613 Clutch employing constant force springs Automatic system and interchangeable optical instrument therefor Optical unit Patent #: 4564265 InventorsAssigneeApplicationNo. 06/767460 filed on 08/20/1985US Classes:359/827, Detachably attached (e.g., plate, barrel, etc.)192/69.8, Axial-axial192/69.82, Square tooth403/300DISTINCT END COUPLERExaminersPrimary: Punter, William H.Attorney, Agent or FirmInternational ClassesF16D 1/10 (20060101)G03B 17/14 (20060101) G03B 17/12 (20060101) F16D 1/00 (20060101) Foreign Application Priority Data1984-08-24 JPAbstractA 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. | |
