Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Reexamination Certificate
2000-02-15
2001-09-18
Hail, III, Joseph J. (Department: 3723)
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
C269S048100, C029S898080
Reexamination Certificate
active
06289566
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to the installation by press fitting of valve seats, cup plugs bushings and the like into a receiving body and more particularly to an apparatus which facilitates installing such workpieces.
BACKGROUND OF THE INVENTION
Various forms of workpiece holders have been in use for holding hollow workpieces for press fitting. For example, permanent magnets or electromagnets within a press tool have been used to hold metallic workpieces. However, the use of magnets inherently attracts metal chips, metal shavings and other fine metal particles to the press tool. This affects the press tool's ability to properly and accurately locate and press a workpiece. Some workpieces, such as valve seats, cup plugs and the like require a high degree of accuracy when pressed into a bore of a body to ensure that the workpieces are accurately located and firmly positioned within the body.
Other types of workpiece holders include spring loaded fingers built into the nose of a press tool. The main drawback to this type of workpiece holder is that it limits the size of the workpiece to be held because space is needed for the spring fingers, springs, pivots and other various pieces of the assembly. Split collet type tools have also been used to hold a hollow workpiece being pressed. However, these tools are fragile because the inside diameter of the collet has to be thin enough to flex and yet be made of hardened steel for wear.
Another non-magnetic workpiece holder is disclosed in U.S. Pat. No. 5,539,968. The press tool of the '968 patent uses a split ring to engage the inside surface of the workpiece which when received on the tool has a generally flat face received and seated on a flat face of the press tool. By compressing or shifting the split ring, the workpiece may shift laterally relative to the press tool with its axis remaining substantially parallel to the axis of the press tool. This limited lateral shifting of the workpiece facilitates pressing the workpiece into a bore which has an axis parallel to but slightly offset from the axis of the press tool so that the press tool and bore do not have to be perfectly coaxially aligned with each other. However, the engagement of the flat face of the workpiece and flat face of the press tool does not permit the workpiece to become tilted or shifted angularly relative to the press tool and thereby requires the axis of the press tool to be parallel to the axis of the bore for proper insertion of the workpiece into the bore.
SUMMARY OF THE INVENTION
A workpiece holder for a press tool has a mounting ring which carries a circular retainer clip for frictionally engaging the inside of the workpiece and has a non-planar or inclined end face engaged with a complimentary shaped end face of the pressing tool to permit relative angular movement between the mounting ring and pressing tool. This permits the axis of the mounting ring and hence, the axis of the workpiece carried by the mounting ring, to be angularly varied relative to the axis of the pressing tool to permit substantially coaxial insertion of the workpiece into a bore of a body even when the axis of the pressing tool is angularly offset or skewed relative to the axis of the bore.
Objects, features and advantages of this invention are to provide a workpiece holder for a press tool that can hold workpieces of varying composition and size, permits a press tool to be angularly offset relative to the bore, prevents damage to the workpiece and the bore, prevents the press tool from binding or jamming with the bore, assures an accurate and complete insertion of the workpiece into the bore, is simple, rugged, durable, reliable, of relative simple design and economical manufacture and assembly, and has a long, useful in-service life.
REFERENCES:
patent: Re. 36009 (1998-12-01), Shultz
patent: 1135983 (1915-04-01), Bartlett
patent: 1496451 (1924-06-01), Canfield et al.
patent: 2513412 (1950-07-01), Holsing
patent: 3792856 (1974-02-01), Hernandez
patent: 4882829 (1989-11-01), Dawe
patent: 4907333 (1990-03-01), Dawe
patent: 5539968 (1996-07-01), Meyer
patent: 6152165 (2000-11-01), Fukuda
Hail III Joseph J.
Reising Ethington, Barnes, Kisselle, Learman & McCulloch, P.C.
Shanley Daniel
Unova IP Corp.
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