Metal working – Method of mechanical manufacture – Shaping mating parts for reassembly in different positions
Reexamination Certificate
2000-03-16
2001-11-27
Hughes, S. Thomas (Department: 3726)
Metal working
Method of mechanical manufacture
Shaping mating parts for reassembly in different positions
C029S527100, C029S527300, C029S530000, C264S251000, C264S254000, C264S255000, C264S152000
Reexamination Certificate
active
06321434
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method for manufacturing a sealing tool which has a socket at one end of its linear element and a head at its other end, and also which is provided with a protrusion for engaging the head into a head-insertion hole of the socket.
2. Description of the Prior Art
Conventionally, when manufacturing a sealing tool which has respectively a socket at one end of its thread strip and a head at the other end and also which is provided with a protrusion for engaging the head in a head-insertion hole of the socket, a part of the thread strip traversing in a socket-molding cavity, i.e. the thread strip positioned in the socket hole has been cut off though a cut-off portion of a piston-type movable mold (see Japanese patent application Kokai publication No. 60-2458).
However, if the thread strip traversing in the socket hole remains therein without cutting off, the remaining part of the thread strip acts as an obstacle, making it impossible to insert the head into the socket hole.
Moreover, according to this prior art, after the thread strip to which the socket and the head are fixed is once wound around a bobbin, while rewinding the thread strip from the bobbin the thread strip is cut off between the socket and the head in order to manufacture the seating tool, thus taking much time to resultantly make it impossible to manufacture the sealing tool efficiently.
BRIEF SUMMARY OF THE INVENTION
In view of the above problems, it is an object of the present invention to provide a method for manufacturing a sealing tool with a high quality of which the linear element does not protrude into the head-insertion hole.
The method for manufacturing such a sealing tool according to the invention that has respectively a socket at one end of its linear element and a head at the other end and also that is provided with a protrusion for engaging the head in a head-insertion hole of the socket comprises the steps of: fixing a core ball and either one of the above-mentioned socket or the above-mentioned head to the above-mentioned linear element; cutting off the above-mentioned linear element at a position near the above-mentioned core ball; setting the above-mentioned core ball into a cavity while drawing out the above-mentioned linear element; filling synthetic resin into the above-mentioned cavity, to double-mold a member connectable with another member molded together with the above-mentioned core ball in such a manner that the former member may include the above-mentioned core ball.
Thus, after fixing the core ball and either one of the socket and the head to the linear element, that linear element is cut off at a position near the core ball to grip the core ball with a gripping portion of a carrier robot etc. in order to set the core ball in the cavity while drawing the linear element out of a reel etc. Then, synthetic resin may be filled in the cavity to double-mold a member (e.g., a socket in the case where the core ball and the head are formed together) connectable with another member molded together with the core ball so as to include the core ball, thus preventing the linear element from protruding into the head-insertion hole. As a result, it is possible to manufacture a high-quality sealing tool efficiently.
Moreover, according to the present invention, by fixing a plurality of core balls at one end of a linear element, the core ball positioned at the top can act as a member for stopping the other core balls from being extracted, thus preventing them from falling out.
Further also, according to the present invention, by utilizing the core ball as a gripped portion of a linear element draw-out means, the core ball can be automatically transported into a cavity for molding the socket or the head.
This core ball has a function of carrying the linear element to a predetermined position by using a gripping portion of a carrier robot etc., a function of fixing a tip of the linear element in the mold cavity, and a function of fixing a piece made of synthetic-resin at the end of the linear element to fill the cavity with necessary resin in order to mold, so-called double-mold, a predetermined molding product.
REFERENCES:
patent: 4636347 (1987-01-01), Kato
Arent Fox Kintner & Plotkin & Kahn, PLLC
Hong John C.
Hughes S. Thomas
Toska Co., Ltd.
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