Winding – tensioning – or guiding – Coil holder or support – Mounted coil holder or spindle
Reexamination Certificate
1999-10-20
2001-10-23
Rivera, William A. (Department: 3653)
Winding, tensioning, or guiding
Coil holder or support
Mounted coil holder or spindle
C242S530400, C242S611200
Reexamination Certificate
active
06305638
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable.
REFERENCE TO A MICROFICHE APPENDIX
Not Applicable.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention refers to cores used for the winding and rewinding of products in the paper, textile, plastic and metal industries, and to core and shaft assemblies used in turn up operations in the papermaking industry.
2. Related Art
A wide variety of core and shaft assemblies are used in winding and storing products. It is common practice to use a fiber core and a pneumatically expandable shaft such as those manufactured by Tideland or Doublin which are high maintenance items requiring high initial costs. Fiber cores, however, have a relatively short lifetime and also have a tendency to absorb moisture from the air. This process can weaken the core and prevent proper operation of the shaft core assembly particularly where close tolerances are required. Finally, the core and shaft should be a self-locking assembly that provides for a minimal chance of slippage between the two under heavy loads. Improvements are needed in the prior art apparatus.
BRIEF SUMMARY OF THE INVENTION
In one aspect of the present invention there is provided a self-locking core and shaft assembly comprising an elongate generally cylindrical shaft having an exterior surface and opposite end portions, the shaft having a plurality of spaced laterally protruding first bosses formed in the exterior surface and extending longitudinally substantially the length of the shaft. The spaced first bosses define elongate first channels therebetween that extend substantially the length of the shaft. A hollow elongate generally cylindrical core has an interior surface and an exterior surface. The interior surface is formed of a plurality of inwardly protruding second bosses extending substantially the length of the core, which define second channels extending substantially the length of the core, which is sized to be tightly fitted over the shaft to minimize movement of the core with respect to the shaft. The shaft is formed of metal and the said core is formed of reinforced fiberglass or plastic or other material that resists absorption of water.
The assembly includes a pair of longitudinally extending axles mounted to respective end portions of the shaft. A securing means is mounted adjacent at least one end portion of the shaft to inhibit longitudinal movement of the core with respect to the shaft. The core is formed to be substantially equal in length to the shaft and includes distance markings thereon to assist in the placement of the core onto the shaft in a desired position along the shaft.
The assembly further includes at least one spacer for mounting adjacent one end portion of the core, the spacer including an elongate hollow generally cylindrical body having an interior surface having formed thereon a plurality of inwardly disposed spaced third bosses and extending substantially the length of the body. The third bosses define spaced third channels extending substantially the length of the body and are sized to fit within the third channels to provide that the spacer fits tightly onto the shaft to minimize rotary movement of the core with respect to the shaft. The outer diameter of the spacer body is less than the outer diameter of the core. The spacer is formed of material that is resistant to the absorption of water.
In other aspects of the present invention there is provided a self-locking core and shaft assembly comprising an elongate generally cylindrical shaft having an exterior surface and opposite end portions and a plurality of spaced laterally protruding first bosses formed in the exterior surface and extending longitudinally substantially the length of the shaft. The spaced first bosses define elongate first channels therebetween which extend substantially the length of the shaft. A hollow elongate generally cylindrical core has opposite end portions and has an interior surface and an exterior surface and is substantially the same length as the shaft. The interior surface has formed thereon a plurality of inwardly disposed second bosses that extend substantially the length of the core which define second channels extending substantially the length of the core. The first bosses fit into the second channels and the second bosses fit into the first channels to provide that the core fits tightly onto the shaft to minimize rotary movement of the core with respect to the shaft. The shaft is formed of metal and the core is formed of material that resists absorption of water. The assembly further includes securing means mounted to the shaft adjacent at least one end portion thereof to inhibit longitudinal movement of the core with respect to the shaft.
REFERENCES:
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patent: 6047918 (2000-04-01), Saito
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patent: 2356245 (1975-06-01), None
Rivera William A.
Sandar Industries, Inc.
Yeager Arthur G.
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