Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Fastener securing element – Cotter pin
Patent
1998-09-29
2000-10-03
Saether, Flemming
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Fastener securing element
Cotter pin
411502, 411475, 411471, 411463, F16B 2114
Patent
active
061263729
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an article-fixing device and a method for removing the article-fixing device. In particular, the invention relates to an article-fixing device suitable for mounting various types of objects on wall surface made of weak board using plaster board, aerated lightweight concrete (ALC) or veneer (hereinafter referred as "weak board"), ceiling, wooden plate wall, and external wall sidings as well as half-dried mortar wall. The invention also relates to a method for removing the article-fixing device by withdrawing a pin unit, which is a component part of the article-fixing device.
BACKGROUND ART
In the past, an article-fixing device of this type has been known from JP-A-2-17207. According to the invention described in this patent publication, a pin unit of the device is produced from a material as shown in FIG. 1 to FIG. 4. To produce the pin unit as shown in the figures, it is necessary to perform at least the following four processes: (1) cutting process to cut a straight wire material to a predetermined length; (2) bending process to bend the wire material to form a head of circular shape using a bending die; (3) serration forming process for forming serrated blades directed downward on outer side of each leg; and (4) machining process to taper tip of each of the legs. Therefore, there have been problems in that it is not suitable for mass production, that it is not possible to produce at the price acceptable in the market, and that the invention is not used in practical application because the product is not merchandised.
DISCLOSURE OF THE INVENTION
To solve the above problems, the present inventor has made strenuous efforts in studying and performing experiment to achieve mass production of the pin unit and to produce at lower cost and has finally succeeded in developing an article-fixing device suitable for the purpose. According to this invention, a pin unit in flat shape is formed by a single process through press punching from a tough metal thin plate, whereby special care is taken on a washer to be combined with the pin unit so that twisting or deformation of pin legs due to the use of thin plate do not occur when pin unit is driven, and an object to be fixed is firmly mounted by driving the pin unit straightforward. Also, the inventor has successfully developed a method for easily withdrawing the pin unit which has been driven into the weak board via washer.
The article-fixing device according to the present invention comprises a pin unit and a washer combined together for supporting an object to be fixed, whereby the pin unit is designed in flat shape and formed by punching a metal plate, has legs formed in shape of a fork and extending from a head of the pin unit, and tips of the legs are tapered and spread out, and the washer comprises a pair of guide gaps arranged at opposed positions and for guiding operation to drive the forked legs and for maintaining an angle of driving at a constant angle, the forked legs inserted into the guide gaps are spread out between the pair of guide gaps, and a support base provided between the pair of guide gaps and used for spreading the forked legs inserted into the guide gaps and for maintaining spreading condition of the forked portion of the pin unit. Also, the washer may comprises an engaging unit to engage with the object to be fixed. Further, a pair of guide gaps having gap width approximately equal to thickness of each leg may be arranged to maintain the driving angle of the forked legs at a constant angle. In addition, a reinforcement rib may be provided along longitudinal direction on flat surface of each leg of the pin unit.
A dented portion dented into the legs may be arranged on each side of the forked portion of the pin unit, and an expanded portion may be provided on each side of the head to match the dented portion. Also, projection may be provided on each side of the head, and the pair of legs may be curved toward outside in bow-shape in order that distance between the two legs will be the narro
REFERENCES:
patent: 919631 (1909-04-01), Page
patent: 2034080 (1936-03-01), Bitzinburger
patent: 3499359 (1970-03-01), Yrjanainen
patent: 4988249 (1991-01-01), Kardefeldt et al.
Saether Flemming
YU YU Inc.
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