JPH0615887U - Screw tip with copper packing - Google Patents

Abstract

(57) [Abstract] [Purpose] By inserting the packing into the chip before rolling the thread of the screw chip, it is possible to save the trouble of attaching the screw chip to the chip holder and to prevent the packing from coming out. It is an object of the present invention to provide a screw tip with a copper packing that can be easily mounted without any problem and has a good sealing property. In a screw tip 1 in which a screw 4 is threaded on a cylindrical portion extending rearwardly from a tip barrel 2 with a step 3 formed therein, a hole 6 having a diameter smaller than the thread diameter of the screw is provided between the tip barrel and the screw portion. Screw chip with a copper packing in which the copper packing 5 provided with is arranged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw tip in which a screw is engraved on a cylindrical portion extending rearward from a tip welding tip cylinder with a step.

[0002]

[Prior art]

 The tip for spot welding is attached to the tip of the tip holder, but there is an excessive possibility that the attachment portion of the tip will be overheated by the welding operation. There, a cooling water passage is formed in the tip holder to cool the vicinity of the tip mounting portion. In such a case, there is one in which a copper packing is provided to prevent the leakage of cooling water from the end of the mounting portion of the chip and to improve the conductivity (for example, see Japanese Utility Model Laid-Open No. 2-48289).

When attaching a screw tip to the tip holder, a copper packing 12 prepared in advance is inserted into a prepared tip 11 and the one shown in FIG. 2 is attached to the tip of the tip holder. Install it.

[0004]

[Problems to be solved by the device]

 By the way, in the conventional technique as described above, when the copper packing 12 is inserted into the screw chip 11, the hole 13 of the copper packing 12 passes through the screw thread 14 of the screw chip 11, so that the diameter of the hole 13 is small. Must be larger than the diameter of the thread 14. Therefore, it takes a lot of time for insertion and attachment, and the packing easily comes out, and moreover, there is a gap between the screw thread 14 of the screw chip 11 and the hole 13 of the copper packing 12, and the contact area between the screw chip 11 and the copper packing 12 and the copper packing 12 and the chip. There is a problem that the contact area of the holder becomes small and the sealing property deteriorates.

The present invention has been made in view of the above problems of the conventional technique, and an object thereof is to insert a packing in advance into a screw chip before rolling the screw. This eliminates the need to attach the screw tip to the tip holder, and at that time, the packing tip does not come off and can be easily attached, and the screw tip with the copper packing has good sealing property. is there.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the screw tip with copper packing according to the present invention is characterized in that a copper packing having a hole diameter smaller than the thread diameter of the screw is arranged between the tip body and the screw portion. is there.

[0007]

[Action]

 Insert a copper packing with a hole of approximately the same diameter as the small diameter part where the screw before thread rolling of the screw tip is formed and thread the screw by rolling, and the hole diameter of the copper packing will be It will be smaller than the mountain diameter. In this way, by inserting the copper packing into the screw tip in advance, the time and effort for attaching the screw tip to the tip holder can be saved, and the packing does not come out at that time. Moreover, when the screw chip with the copper packing is attached to the chip holder, the hole diameter of the copper packing is small and the copper chip comes into close contact with the upper shaft portion of the screw part, so that the sealing property is improved.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to FIG. In the figure, reference numeral 1 denotes a screw tip, and the screw tip 1 comprises a body portion 2 and a screw portion 4 extending from a step portion 3 at the rear thereof. A copper packing 5 is preliminarily inserted between the step portion 3 and the screw portion 4 of the screw chip 1 to form a screw chip with a copper packing as a whole.

In order to insert the copper packing 5 into the screw chip 1, for example, the chip body 2 is formed from the material of the screw chip 1, the step 3 is finished by machining, and the screw of the screw chip is attached. By inserting a copper packing 5 having a hole 6 having substantially the same diameter as the small diameter into the small diameter portion where the screw is formed before rolling, and rolling the small diameter portion with the copper packing 5 inserted. A screw is threaded to form the screw portion 4. By doing so, the diameter of the hole 6 of the copper packing 5 becomes smaller than the thread diameter of the threaded portion 4, and the copper packing 5 is reliably held by the screw tip 1.

Then, in order to attach the screw chip with the copper packing according to the present invention to the chip holder (not shown), the screw portion 4 of the screw chip with the copper packing is inserted into the screw hole formed at the tip of the chip holder. Just screw in.

[0011]

[Effect of device]

 According to this invention, since the copper packing is preliminarily attached to the screw tip, it is possible to save the labor of mounting the tip to the chip holder, and at that time, the hole diameter of the packing is made smaller than the diameter of the screw thread of the screw tip. Therefore, the packing will not come out. Moreover, when the screw chip with the copper packing is attached to the chip holder, the hole diameter of the copper packing is small and the copper chip comes into close contact with the upper shaft of the screw part, and the contact area between the screw chip and the copper packing and the copper packing and the chip holder- Since the contact area of is large, the sealability is significantly improved.

[Brief description of drawings]

FIG. 1 is a side view of a screw chip with a copper packing according to the present invention.

FIG. 2 is a side view of a conventional example in which a copper packing is inserted and attached to a screw tip.

[Explanation of symbols]

 1 screw tip 2 tip body 3 step 4 screw part 5 copper packing 6 hole formed in copper packing

Claims (1)

[Scope of utility model registration request] 1. A screw tip, in which a screw is threaded on a columnar portion extending rearward from a tip cylinder, the copper having a hole diameter smaller than the thread diameter of the screw between the tip cylinder and the screw portion. Screw tip with copper packing, which is characterized by packing.