US PATENT SUBCLASS 72 / 347
.~ Cup or shell drawing (i.e., deep drawing)

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


72 /   HD   METAL DEFORMING

343  DF  BY USE OF CLOSED-DIE AND COACTING WORK-FORCER (E.G., PUSH-DRAWING) {3}
347.~ Cup or shell drawing (i.e., deep drawing) {2}
348  DF  .~.~> With additional metal-deforming {1}
350  DF  .~.~> With application of frictional restraining force to work during deformation {1}

DEFINITION

Classification: 72/347

Cup or shell drawing (i.e., deep drawing):

(under subclass 343) Subject matter wherein said movable member comprises a head or shoulder designed and intended to abuttingly engage work, and which head or shoulder is movable, while engaged with a first portion of the work, into and past said orifice or into a substantially cylindrical or parallel-sided work shape-imposing section of said cavity or passageway, at least some other portion of work material being pulled by said first portion into such forcible engagement with the wall of the orifice, cavity, passageway, as to have impressed thereon a shape corresponding to said engaged wall.

(1) Note. Apparatus of this subclass is intended to operate on work of initial dimension larger than the work-shaping opening. The product may be a discrete cup or shell having the dimension of the opening, and with or without a flange, rim, or undrawn material left attached localized drawn portion such as a flanged opening (see diagram under subclass 350).

(2) Note. Although the typical product is cylindrical in form, apparatus of this subclass may be used to draw a tapered object, if sufficient clearance is provided between plunger and draw ring (closed-die); the product may also be

of interrupted or segmental form as determined by the initial shape or size of the blank.

(3) Note. If the plunger merely pushes material into a die cavity without itself entering the cavity, the operation is closed die forging for subclass 352; if the plunger (or male die) enters the die cavity but does not reach a cylindrical or parallel-sided portion thereof while pulling work therewith (i.e., subclasses 347+), see subclasses 358+. Deep drawing may be accompanied by die forging, embossing, etc., for which see subclass 348.

SEE OR SEARCH THIS CLASS, SUBCLASS:

348+, for deep-drawing (means or method) combined with other metal deformation.