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Method for making a head of piolet
| Details |
Inventors: Bibollet, Jean-Claude;
Assignee:
Primary Examiner: Parker; Roscoe V.
Assistant Examiner:
Attorney, Agent or Firm: Larson & Taylor
A method is provided which produces a head of piolet, all in one piece, by punching out a metallic blank (i.e. a long cross-shaped blank whose outline is symmetrical with regard to its longitudinal axis and comprises four parts: a peen part, a pike part, and two lateral fastening flaps) from a plate of metal, and then by the folding of that metallic blank symmetrically with regard to its medial plane, along its longitudinal axis or on both sides thereof, at least along that portion of length which corresponds to the pike. The blank is eventually shaped approximately along an arc of circle which is located along the medial plane of the blank before mounting upon the handle of the piolet. |
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DETAILED DESCRIPTION It is an object of the invention to provide a method for making a head of a piolet which avoids these disadvantages and which is simple, fast and economical, and moreover which may be easily automated and used for mass production.
This method of the invention basically comprises producing the said head, all in one piece, by punching out a metallic blank from a plate of metal and then by the folding of that metallic blank.
According to the preferred embodiment of this method, the metallic blank is punched out along an outline which is symmetrical with regard to its longitudinal axis, and then is folded symmetrically with regard to the middle or medial plane of the blank along that portion of length which corresponds to the pike and to the part of the head by which this head is mounted on the handle of the piolet.
According to a first embodiment of the method, the said folding is achived approximately along the longitudinal axis of the metallic blank and on at least the portion of length which corresponds to the pike, and the two corresponding symmetrical parts come to be placed jointedly, one close to the other, and then they may to be joined together by fastening means.
According to a second embodiment of the method, the said folding is achieved on both sides of the longitudinal axis of the metallic blank and symmetrically with regard to its medial plane, at least along that portion of length which corresponds to the pike, so that the two folded parts are parallel, non-joined and delimit between them a channel with a "U" shaped cross-section.
According to a variant of the first embodiment of the said method, the portion of the metallic blank which corresponds to the pike is initially punched out according to a "V" design with two divergent prongs which are symmetrical with regard to the longitudinal axis of the blank and, after the folding, are joined side by side and form the said pike.
According to another feature of the method of the invention, the head is shaped approximately along an arc of a circle which is located along the medial plane of the metallic blank, by means of a curving operation which is achieved during or after the folding of the blank
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