Metal deforming – With cutting – By composite tool
Patent
1997-06-25
1998-10-06
Crane, Daniel C.
Metal deforming
With cutting
By composite tool
72325, 72335, 83 54, 83686, B21D 2814, B21D 2828
Patent
active
058160930
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP95/01949, filed Sep. 27, 1995.
TECHNICAL FIELD
The present invention relates to a method for forming a tapered through hole in a work by pressing and a tool therefor, and, more specifically, in a pipe joint in which a plug and a socket can be locked with each other by utilizing, e.g., a locking ball, to a method for forming a tapered hole serving to hold a locking ball formed on a socket side by pressing and a hole forming tool therefor.
BACKGROUND ART
A locking mechanism used in a conventional pipe joint will be described with reference to the accompanying drawings. FIG. 9 is a sectional view of the pipe joint.
Referring to FIG. 9, the pipe joint comprises a socket 20 and a plug 30. The plug 30, having a communicating hole 33, has a large-diameter portion having an outer circumferential groove 31 to engage with locking balls (to be described later) provided on the socket 20 side, and a small-diameter portion 32 on its end that can be freely inserted into the socket.
The socket 20 having a communicating hole 26 has a front cylinder 21 in which the plug 30 is to be inserted, and a rear cylinder 21' to be connected to the front cylinder 21 with a screw 25. A packing 22 is disposed between the front cylinder 21 and the rear cylinder 21', and a valve body 24 biased by the biasing force of a spring 23 toward the packing 22 is disposed. When the plug 30 is not inserted in the socket, this valve body 24 abuts against the packing 22 with the biasing force of the spring 23 to shut off the communicating hole 26. Tapered through holes 27 are formed in the front cylinder 21 equidistantly in the circumferential direction to extend in the radial direction, and locking balls 28 are fitted in the tapered through holes 27 such that their spherical portions project over the inner surface of the front cylinder 21 to engage in the outer circumferential groove 31 of the plug 30. An operation sleeve 29 elastically biased by a spring 29a is fitted on the outer circumferential surface of the front cylinder 21, and a pressure surface 29b for pressing the locking balls 28 toward the center is formed on the sleeve 29.
When the operation sleeve 29 is moved to the right in FIG. 9 against the biasing force of the spring 29a, inserting the plug 30 into the socket 20 causes the locking balls 28 arranged in the front cylinder 21 to project into the outer circumferential groove 31 formed in the plug 30. Simultaneously, the valve body 23 is also pushed to the right in FIG. 9 by the distal end of the plug 30 to open the flow channel, thereby causing the communicating holes 26 and 30 of the socket and plug to communicate with each other. While the locking balls 28 engage in the outer circumferential groove 31, when the operation sleeve 29 is released, the sleeve is returned to the position shown in FIG. 9 by the biasing force of the spring 29a, and the locking balls. 28 are pushed inward in the radial direction by the pressure surface 29b of the operation sleeve 29 to maintain engagement with the outer circumferential groove 31.
As described above, in the conventional pipe joint, when connecting a plug and a socket, a locking mechanism utilizing locking balls is employed. The locking balls 28 are generally accommodated in the tapered through holes 27 formed in the socket, as described above. Therefore, the locking balls 28 will not come off toward the center of the front cylinder 21 due to the effect of the tapered through holes 27 when, e.g., assembling the socket.
The tapered through holes 27 formed in the front cylinder 21 are usually located at positions equally dividing the outer circumference of the front cylinder into a plurality of portions. Conventionally, to form these tapered through holes, a boring machine, e.g., a drilling machine, is used while indexing the positions on the outer circumference. Holes are formed one by one by a taper drill, and are finished by a reamer.
However, to form tapered through holes one by one by using the taper drill and the reamer is very cumbersome. As the serv
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Press Working Handbook dated Oct. 25, 1975.
Press Punching and Die Design dated Jan. 15, 1965.
Kubo Haruo
Takeuchi Hirosato
Yasuda Shigeru
Crane Daniel C.
Nitto Kohki Co. Ltd.
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