Joints and connections – Interfitted members – Including set screw
Patent
1996-03-26
1997-10-21
Kim, Harry C.
Joints and connections
Interfitted members
Including set screw
403373, 384541, F16C 35063
Patent
active
056789491
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device which can be selectively locked or clamped to a shaft or tube.
BACKGROUND TO THE INVENTION
In many mechanical applications it is necessary to clamp one component, such as a bearing, a sprocket or a pulley, to a rotatable component, such as a shaft or spindle.
One simple way of clamping the component in place is to use one or more grub or set screws which engage with the outer surface of the shaft. The set screws can then be received in screw threaded or tapped bores in the component. In the case of a bearing the screws are placed in tapped bores in the inner ring. The screws tend to damage the shaft particularly if the component is removed from the shaft from time to time. The tightening of the screws also cause high tensile stresses in the inner ring and fracture can occur. The provision of the tapped bores also entails additional operations. Another well known design utilizes an eccentric collar with a set screw which when engaged also tends to damage the shaft. Moreover it is not easy to establish the direction of tightening or loosening when releasing the collar and the collar is prone to damage. The eccentric collar also requires specifical machining.
GB-A-978361 describes a clamp with an outer holding member and an inner ring retained in a recess in the holding member. A single set screw in a tapped bore in the holding member forces the ring and the holding member apart and effects clamping to the shaft.
EP-A-0088589 describes a fluid coupling with a shaft having a boss portion with a blind opening for receiving another stub shaft supporting a hub and pulley assembly in coaxial relation to the coupling shaft. An adaptor is clamped to the hub assembly and has an axial region extending around the boss portion. The axial region of the adaptor has screw-threaded bores in diametrically opposed positions into which set screws are fitted. The boss portion has a v-shaped groove into which the set screws can be engaged to displace the boss portion and the shaft axially to locate radial end wall surfaces of the adaptor and the boss portion.
A general object of the present invention is to provide an improved form of locking device.
DISCLOSURE OF THE INVENTION
According to the invention, and as is known from EP-A-0088589, there is provided a device for locking to a component rotatable about an axis; said device comprising a collar with an end wall with a surface confronting a surface of the component and a region extending axially from the end wall, a ring disposed between the axial region of the collar and the component the ring having a first surface confronting the surface of the component and a second surface which is inclined relative to the axis of rotation to converge with respect to the axis of rotation in a direction away from the end wall and several screw-threaded elements received in threaded bores extending radially through the axial region of the collar. In accordance with the invention the confronting surfaces of the collar and the ring form contact surfaces for contacting the surface of the component, the threaded bores are spaced apart relative to the rotational axis other than at 180.degree. and the screw-threaded elements can be tightened to bear into or against the second contact surface of the ring to cause the contact surface of the collar and the first contact surface of the ring to exert radial clamping force on the component at diametrically opposed zones.
The ends of the screw-threaded elements may have plane surfaces parallel to the rotational axis or set at an angle which may have the same sense as the angle of the second contact surface of the ring. It is possible to provide shallow depressions, recesses or blind bores in the second contact surface for receiving the ends of the screw-threaded elements.
Preferably the surfaces of the collar and the ring which contact the component and exert clamping force therein lie directly alongside one another along the axis of rotation. Between these contact surfaces there may be ra
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Kim Harry C.
NSK-RHP European Technology Co. Limited
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