US PATENT SUBCLASS 29 / 446
.~.~ With prestressing of part

Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
428  DF  .~ Assembling or joining {21}
446.~.~ With prestressing of part {5}
447  DF  .~.~.~> By temperature differential (e.g., shrink fit)
448  DF  .~.~.~> Of skin on frame member {1}
450  DF  .~.~.~> Elastic joining of parts {1}
452  DF  .~.~.~> Prestressing rod, filament or strand
453  DF  .~.~.~> By snap fit

DEFINITION

Classification: 29/446

With prestressing of part:

(under subclass 428) Process wherein one part is distorted within its elastic limit, e.g., by tension or compression, and while so distorted is subsequently fastened to one or

more other parts while in a stressed condition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

525, for a process of fastening parts by means of a driven force fit. A force fit differs from prestressing of a part in time of application of stress, in that the stress in a force fit is initiated at the time of joinder whereas in this subclass the stress is applied prior to the time of joinder. For example, forcing a rod into a hole of smaller size so that the parts are held by the frictional engagement of the rod and sides of the hole is a process of force fitting for subclass 525. However, if the same rod is stretched within its elastic limit to thin it and inserted in the same hole while stretched, and the stretching force is then released to permit the rod to expand radially outwardly to frictionally grip the sides of the hole, that process is considered classifiable in these subclasses (446+) and indented subclasses.

SEE OR SEARCH CLASS

52, Static Structures (e.g., Buildings),

223.1+, for prestressed structure in a static building.

156, Adhesive Bonding and Miscellaneous Chemical Manufacture, 160+, for a laminating process involving uniting in stressed condition of prestressed elements.

264, Plastic and Nonmetallic Article Shaping or Treating: Processes, for a process of molding plastic material with prestressing by a metal reinforcing means.