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US 2008/0173851 A1Published application
Overload Preventing Apparatus in Hoist
AssigneeKito Corporation
InventorsDesheng Xia, Koji Koyama
Life of this patent
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AssigneeKito Corporation
InventorsDesheng Xia, Koji Koyama
Estimating the term…
An overload preventing apparatus of a hoist characterized in including a drive shaft 2 for driving a load sheave 1, a pressure receiving member 4 outwardly fitted to the drive shaft 2, a drive member 10 for transmitting a drive force from operating means 14 to the drive shaft 2 by way of the pressure receiving member 4, a rotation drive member 12 including means of transmitting the drive force from the operating means 14 to the drive member 10 and releasing an engagement with the drive portion 10 when the operating means 14 is applied with a torque equal to or larger than a predetermined torque value and an elastic member 13 mounted along an axial direction of the drive member between a back face of the rotation drive member 12 and an inner side end face of the operating means 14 to pose a problem that a belleville spring is obliged to be used as urging means, and therefore, a stroke in the axial direction of the urging means is small, also a height of an engaging claw becomes small in accordance with the stroke of the belleville spring and a variation in a load relative to a height of the claw becomes large.
1-11. (canceled)
An overload preventing apparatus of a hoist characterized in an overload preventing apparatus of a hoist including a drive member for driving cooperatively with driving of operating means, and a drive apparatus for transmitting driving of the drive member to a drive shaft for driving the hoist by way of brake means, wherein an interval between an inner peripheral face of the operating means and an outer periphery of the drive member brought into sliding contact with a ring-like guide portion provided at an end face of the inner periphery includes a rotation drive member engaged with the drive member and the operating means and having means for transmitting driving of the operating means to the drive member and restricting a torque transmitted to the drive member by a torque of the operating means, a spring member formed between a back face of the rotation drive member and a spring member wound around an outer periphery of the drive member in a cylindrical space formed between a back face of the rotation drive member and a spring holder extended in an axial direction for pressing the rotation drive member to a side of the drive member, and the spring holder brought into contact to be fixed by a step portion provided at the drive member for restricting the spring holder from moving to a side of the rotation drive member, pressing an end portion of the spring member and having a guide portion brought into sliding contact with a ring-like guide portion provided at an end face of an inner periphery of the operating means to guide.
Dependencies are inferred from the claim text.