Fabrication method for instrument material holder
AssigneeThe Perkin-Elmer Corporation
InventorsHenry W. Bullinger, Clifford L. Friesel
Life of this patent
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Abstract
A material holder is fabricated by press-fitting and welding a series of discs into an open cylinder housing. Shrinkage of the cylinder from the welding of the first disc is accommodated by selecting a smaller disc for the second press-fit. A support post is welded to the last disc and shrinkage of that disc from welding of the support post is accommodated by selecting an oversize disc for attachment to the support post. Shrinkage of the last disc also compensates for additional shrinkage of the cylinder from welding of the second disc.
Claims11
An improved method of fabricating a circular material holder for a measuring instrument such as a differential calorimeter;
- the method comprising the steps of forming a batch of the discs sufficient for production of a batch of predetermined size of the material holders by punching the discs from sheet metal with a punch and die,
- sorting the discs according to diameter into at least two sets of discs including a first set and another set consisting of discs having diameters smaller than the discs of said first set,
- the number of discs in each set being substantially equal,
- machining a batch of cylindrical housings with the inside diameter of each cylindrical housing being machined to be somewhat smaller than the outside diameters of the first set of said discs to provide a press fit of said first set of discs within said housings,
- press fitting one of said discs from the first disc set into each housing and electron beam welding the disc into place to form the top partition of the material holder,
- assembling a coil and associated insulators against the bottom of the partition formed by the welded disc and press fitting into each housing one of the discs from the set of smaller diameter discs to form a second partition within said housing and electron welding the second partition disc into place.
An improved method of fabricating a circular material holder for a measuring instrument such as a differential calorimeter;
- the method comprising the steps of forming a batch of the discs sufficient for production of a batch of predetermined size of the material holders by punching the discs from sheet metal with a punch and die,
- sorting the discs according to diameter into at least two sets of discs including a first set and another set consisting of discs having diameters larger than the discs of said first set,
- the number of discs in each set being substantially equal,
- machining a batch of cylindrical housings with the inside diameter of each cylindrical housing being machined to be somewhat smaller than the outside diameters of the first set of said discs to provide a press fit of said first set of discs within said housings,
- press fitting one of said discs from the first disc set into each cylinder and electron beam welding the disc into place within the cylinder to form the top partition of the material holder,
- assembling a coil and associated insulators against the bottom of the partition formed by the welded disc,
- welding a supporting center post to one side of each disc in the set of larger diameter discs,
- and press fitting one of the discs carrying the welded center post into the bottom end of said housing and electron beam welding that disc in place to form a second partition.
An improved method of fabricating a circular material holder for a measuring instrument such as a differential calorimeter which includes a metal cylindrical housing initially open at both ends and into which a plurality of substantially identical metal discs are press fitted and welded to form a cup having at least one internal compartment;
- the method comprising the steps of forming a batch of the discs sufficient for production of a batch of predetermined size of the material holders by punching the discs from sheet metal with a punch and die,
- sorting the discs according to diameter into three sets of discs including a first set,
- a second set consisting of discs having diameters smaller than the discs of the first set, and a third set consisting of discs having diameters larger than the discs of the first set,
- the number of discs in each set being substantially equal,
- machining a batch of the cylindrical housings with the inside diameter of each cylindrical housing being machined to be somewhat smaller than the outside diameters of the first set of said discs to provide a press fit of said discs within said housings,
- press fitting one of said discs from the first disc set into each cylinder and electron beam welding the disc into place within the cylinder to form the top partition of the material holder,
- assembling a coil and associated insulators against the bottom of the partition formed by the welded disc and press fitting into each housing one of the discs from the set of smaller diameter discs to form a second partition within said housing and electron beam welding the second disc partition into place,
- welding a supporting center post to one side of each disc in the set of larger diameter discs,
- assembling a coil and associated insulators against the bottom of the second partition formed by the second disc within said housing,
- and press fitting one of the discs carrying the welded center post into the bottom end of each housing and electron beam welding that disc in place to form a third partition.
Dependencies are inferred from the claim text.