Coupler of winding key with power spring
AssigneeKabushiki Kaisha Sankyo Seiki Seisakusho
InventorsFumito Komatsu, Yasuto Kudo, Tadashi Kamijima
Life of this patent
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Abstract
A coupler of winding key with a winding shaft comprises a threaded member formed on one of the key and the shaft and a bottomed aperture formed in the other in which a coiled spring is locked against withdrawal. The threaded member is threadably engaged with the coiled spring to couple the key with the winding shaft. When the winding key is turned in a direction to spread the coiled spring, a rotating drive is transmitted to the winding shaft while the key rotates idly when it is turned in a direction to tighten the coiled spring.
Claims13
A coupler of a winding key with a power spring which is wound by rotation of a winding shaft connected thereto comprising a male thread member formed on one of the winding shaft and the winding key, a bottomed aperture having an inwardly extending bevel portion at an open end thereof formed in the other of the winding shaft and the key, a coiled spring disposed and loosely fitted in the aperture, locking means formed by said bevel portion for preventing withdrawal of said spring by engagement with said bevel portion, the male thread member being threadably engaged with said coiled spring to couple the key with the winding shaft, a rotation of the key in a direction to unwind and spread the coil spring radially achieving the transmission of a rotating drive from the key to the winding shaft, and a rotation of the key in the opposite direction causing the winding of the spring on the male thread member and an idle rotation of the key.
A coupler for coupling a winding shaft of a power spring which is connected to the winding shaft so as to be wound thereby by rotation of said winding shaft, with a winding key, comprising a hollow tubular portion adapted to be connected to one of said winding shaft and said winding key and having a bore defined through at least a portion thereof which includes a large diameter outer portion and a portion of smaller diameter located axially adjacent to and extending inwardly from and being of a smaller diameter than said large diameter outer portion, a coil spring having at least a portion of a diameter which is freely fittable within the bore of said hollow tubular portion, a threaded shank member adapted to be connected to the other of said winding shaft and said winding key and being of a size and configuration to threadably engage into said coil spring, said shank portion being effective upon rotation of the key in one direction to expand said coil spring into engagement with the hollow tubular portion in order to rotate the power shaft with the key and to wind the power spring, and said fitted shank portion being effective upon rotation of said key in an opposite direction to tighten said spring so as to release it from said hollow tubular portion.
Dependencies are inferred from the claim text.