초록 ▼

An air impact tool has an air motor driving a rotary impact mechanism which has a drive shaft which is coupled to a coaxial load shaft through a torque-limiting clutch mechanism which includes a rigid torque member coupled to one of the shafts and having a peripheral drive surface with drive surface

An air impact tool has an air motor driving a rotary impact mechanism which has a drive shaft which is coupled to a coaxial load shaft through a torque-limiting clutch mechanism which includes a rigid torque member coupled to one of the shafts and having a peripheral drive surface with drive surface portions, and a yieldable torque member coupled to the other shaft. A plurality of flexible and resilient arms on the yieldable torque member are equiangularly spaced apart around the axis of rotation parallel thereto and are cantilevered from a support yoke, the distal ends of the arms being respectively engaged with the drive surface portions of the torque receiving member. A retaining cylinder encircles the arms and holds them against the drive surface, the retaining cylinder being threadedly engaged with an adjusting member which is rotatable but axially fixed to effect axial movement of the retaining cylinder to vary the retaining force on the torque transmitting arms. Embodiments showing internally and externally threaded retaining cylinders, and planar and concave drive surface portions are disclosed.

대표청구항 ▼

A torque limiting mechanism comprising: first and second rotatable torque structures, the first torque structure including a rigid torque member having a peripheral drive surface including a plurality of drive surface portions, the second torque structure having an axis of rotation and including

A torque limiting mechanism comprising: first and second rotatable torque structures, the first torque structure including a rigid torque member having a peripheral drive surface including a plurality of drive surface portions, the second torque structure having an axis of rotation and including a plurality of flexible and resilient torque members spaced radially from the axis and engageable with said peripheral drive surface; a retainer disposed entirely radially outwardly of the entirety of said resilient torque members and disposed in engagement therewith for holding said resilient torque members in engagement with said peripheral drive surface with a predetermined force for preventing rotation of said resilient torque members and said rigid torque member relative to each other at torques below a predetermined torque, said resilient torque members being yieldable at said predetermined torque and above to accommodate relative rotation between said resilient torque members and said rigid torque member; and rotatable adjusting structure disposed entirely radially outboard of the entirety of said resilient torque members and threadedly engaged with said retainer for cooperation therewith to effect axial movement of said retainer relative to said resilient torque members for varying the predetermined force to vary the torque at which said resilient torque members will yield.