JP3012792U - Water supply cock for diamond core drill - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a water supply cock for a diamond core drill, which is capable of inexpensively constructing a water injection device thereof and which is compatible with a plurality of water supply hoses having different diameters. To aim. [Composition] A water supply cock of a water injection device for injecting water into a core bit at the time of cutting in a diamond core drill for cutting an object to be cut while rotating a cylindrical core bit,
The water supply hose attachment member includes a cock body 20 having a mounting screw portion 23 and water passages 25 and 26, a valve 27 for opening and closing the water passages 25 and 26, and a water supply hose attachment member 22 having a hose attachment portion 37. 22 is the cock body 20
It is configured to be attached so as to be rotatable with respect to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a water injection cock for a diamond core drill. Specifically, it relates to a cock used in a water injection device for improving the machinability of a diamond core drill.

[0002]

[Prior art]

 Conventionally, when drilling concrete etc. using a diamond core drill, water is poured into the core bit that is heated by cutting to cool the core bit to reduce the wear of the core bit and to flush out the chips and clog the core bit. Wet processing methods are often used to prevent this and maintain good sharpness.

FIG. 5 is a diagram showing an example of a conventional core drill device for wet processing having a water injection device. (Reference: Japanese Utility Model Publication No. 1-97848) In the figure, 1 is a core drill main body, an electric motor 2 is attached to the upper side, and one side is attached to a support column 3 so as to be vertically movable. Reference numeral 4 denotes a main shaft, which is driven by an electric motor 2 and is supported by the core drill main body 1 via a bearing 5 so as to project below the core drill main body 1 and a cylindrical core bit 6 is screwed to the lower end thereof. A water injection ring 9 having a cock 12 is rotatably provided at the lower end of the core drill main body 1.

As shown in FIG. 6, a water injection device including the water injection ring 9 is provided with a water injection hole 7 that opens at the lower end of the shaft center of the main shaft 4. At a position corresponding to the vicinity of the lower end, there is provided a water injection passage 8 which opens from the outer circumference to the water injection hole 7 and is formed in the radial direction.

The water injection ring 9 is rotatably fitted on the outer periphery of the lower end of the core drill body 1 from which the main shaft 4 projects, and is prevented from coming off by a retaining ring 10. Then, the water supplied through the cock 12 serves as a water supply hole 11 provided in the water injection ring 9, an annular water injection channel groove 13 and an water injection channel hole 14 provided in the core drill body 1, a water injection channel space 15, a main shaft 4 The water is injected into the core bit 6 through the water injection passage hole 8 and the water injection hole 7 to cool the cutting edge 6a of the core bit, and at the same time, cutting chips can be flowed to prevent clogging. Then, depending on the direction of the water injection source, the direction of the cock 12 can be turned by turning the water injection ring.

[0006]

[Problems to be solved by the device]

 In the above-mentioned conventional core drill apparatus, since the water injection ring 9 is constructed so as to be able to rotate around the main shaft 4 of the core drill, the parts are large and therefore expensive. Also, although there are several types of hoses with different diameters for the water supply hose from the water supply source, the conventional cock is not compatible.

In view of the above-mentioned conventional problems, the present invention intends to realize a water supply cock which can inexpensively configure a water injection device in a diamond core drill and is compatible with a plurality of water supply hoses having different diameters.

The water supply cock for a diamond core drill of the present invention is a water supply cock for a water injection device that injects water into a core bit during cutting in a diamond core drill that cuts an object to be cut while rotating a cylindrical core bit. It consists of a cock body having a mounting screw part and a water passage, a valve for opening and closing the water passage, and a water supply hose mounting member having a hose mounting portion, and the water supply hose mounting member can be swiveled with respect to the cock body. It is characterized by being installed in.

Further, in addition to the above, the water supply hose attachment portion has an attachment capable of attaching a plurality of hoses having different diameters.

By adopting this configuration, the water injection device in the diamond core drill can be constructed at low cost, and a water supply cock having compatibility with a plurality of water supply hoses having different diameters can be obtained.

[0011]

[Action]

 According to the present invention, as shown in FIG. 2, the cock body 20 is provided with a support portion 24 for supporting the water supply hose attachment member 22, and the water supply hose attachment member 22 is rotatably fitted to the support portion 24 so that the water supply The direction of the water supply hose mounting member 22 to which the hose is connected can be oriented in any direction, and water can be supplied without being limited to the position of the water supply source.

Since the water supply hose mounting member 22 is provided with the detachable attachment 42, the attachment 42 can be replaced to accommodate a plurality of hoses having different diameters.

[0013]

【Example】

 1 and 2 are views showing an embodiment of the present invention, FIG. 1 is an external view, FIG. 2 (a) is a longitudinal sectional view, and FIG. 2 (b) is a section taken along line bb of FIG. 2 (a). FIG. In FIGS. 1 and 2, 20 is a cock body, 21 is a lever for opening and closing a valve, and 22 is a water supply hose attachment member for connecting a water supply hose. As shown in FIG. 2, the cock body 20 is provided with a mounting screw portion 23 and a support portion 24 that is positioned at a right angle to the mounting screw portion and that supports the water supply hose mounting member 22 so as to be rotatable. Water passages 25 and 26 are bored along the center line.

A spherical valve 27 is rotatably provided on the cock body 20 at the intersection of the water passages 25 and 26 that intersect at right angles. The spherical valve 27 has an orthogonal water passage 28 through which the two water passages 25 and 26 can be conducted, and a groove for rotation driving is formed in the upper portion, and has a convex portion that engages with the groove. It is adapted to be rotated by a lever 21 via a shaft 29.

Further, the cock body 20 is provided with a hole for inserting the valve 27 into a fixed position during assembly, and a stopper plug 30 for closing the hole after inserting the valve 27 into the hole is provided. In addition, seal members 31 and 32 are provided on the valve seat of the cock and the portion of the stopper 30 that contacts the valve 27. Further, water holes 33 are formed in the support portion 24 radially from the water passage 26, and an annular groove for inserting two O-rings 34 with the water holes 33 sandwiched therebetween and a retaining ring 35 are inserted on the outer periphery. An annular groove is formed.

The water supply hose attachment member 22 is composed of a circular portion 36 that is rotatably fitted to the support portion 24 of the cock body 20 and a tubular hose attachment portion 37, and an annular groove 38 is formed inside the circular portion 36. Further, a water passage hole 39 communicating with the annular groove 38 is formed in the hose mounting portion, and a plurality of steps are formed on the outer periphery for preventing the hose from coming off.

The water supply hose attachment member 22 is inserted into the support portion 24 of the cock body 20, kept watertight by the two O-rings 34, and stopped by the retaining ring 35. The annular groove 38 of the water supply hose mounting member 22 and the water passage holes 33 radially provided in the support portion 24 are provided so as to be aligned with each other.

The cock of this embodiment having the above structure is used as shown in FIG. This figure shows a part of the diamond core drill, which is the same part as the part described in FIG. Therefore, the description of the spindle 4, the core bit 6, etc. is omitted. The cock 40 of this embodiment is attached to the core drill main body 1, and a water supply hose 41 from a water supply source (not shown) is connected to the water supply hose attachment member 22 of the core drill main body 1.

The water supplied from the water supply source is supplied to the cutting edge 6a of the core bit 6 through the water supply hose 41, the cock 40, the water supply hole 11, the water injection passage hole 8 and the water injection hole 7, and the cutting edge 6a. Cooling and discharging of chips are performed. At this time, wherever the water supply source is, the hose mounting member 22 can be turned in that direction. Further, by using the cock of this embodiment, the water injection ring unlike the conventional example shown in FIG. 6 is not required, so that the water injection device can be downsized, and thus the cost can be reduced.

FIG. 4 is a diagram showing a second embodiment of the present invention. This embodiment is basically the same as the previous embodiment, except that the water supply hose mounting member 22 is provided with a detachable attachment 42 so that hoses having different diameters can be connected.

This attachment 42 has a cylindrical shape, and has a threaded portion at one end of its inner diameter that is screwed into the threaded portion 37 a provided on the water supply hose mounting member 22, and has a stepped portion on the outer periphery for preventing the hose from coming off. It is provided. In addition, 43 is an O-ring which maintains watertightness.

In this embodiment configured as described above, the attachment 42 suitable for the water supply hose to be used is attached to the water supply hose attachment member 22 so that the water supply hose having a different diameter can be adapted.

[0023]

[Effect of device]

 According to the present invention, in the diamond core drill, the water supply hose mounting member of the water supply cock can be swung, so that the water supply source can be used anywhere, and the conventional water injection ring is required. Because it does not, it is possible to reduce the size and it is cheaper. In addition, the attachment makes it possible to support multiple water supply hoses with different diameters.

[Brief description of drawings]

FIG. 1 is an external view showing a first embodiment of the present invention.

2A and 2B are views showing a first embodiment of the present invention, in which FIG. 2A is a vertical sectional view and FIG. 2B is a sectional view taken along line bb in FIG. 2A.

FIG. 3 is a view showing a state where the cock according to the first embodiment of the present invention is attached to a diamond core drill.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

FIG. 5 is a view showing a conventional diamond core drill.

FIG. 6 is a cross-sectional view showing a conventional water injection device for a diamond core drill.

[Explanation of Codes] 1 ... Core drill main body 4 ... Spindle 5 ... Bearing 6 ... Core bit 6a ... Cutting edge 7 ... Water injection hole 8 ... Water injection passage hole 11 ... Water supply hole 20 ... Cock body 21 ... Lever 22 ... Water supply hose mounting member 23 ... Mounting screw portion 24 ... Supporting portion 25, 26, 28 ... Water passage 27 ... Valve 29 ... Shaft 30 ... Stopper plug 31, 32 ... Seal material 33, 39 ... Water passage hole 34, 43 ... O-ring 35 ... Retaining ring 36 ... Circular part 37 ... Hose mounting part 38 ... Annular groove 40 ... Cock 41 ... Water supply hose 42 ... Attachment

Claims (2)

[Scope of utility model registration request] 1. A water supply cock of a water injection device for injecting water into a core bit during cutting in a diamond core drill for cutting an object to be cut while rotating a cylindrical core bit, the cock main body having a mounting screw portion and a water passage, A water supply cock for a diamond core drill, which comprises a valve for opening and closing a water passage and a water supply hose mounting member having a hose mounting portion, and the water supply hose mounting member is rotatably attached to the cock body. . 2. The water supply cock for a diamond core drill according to claim 1, wherein the water supply hose attachment portion has an attachment to which a plurality of hoses having different diameters can be attached.