Stop valve-carrying rotary nozzle for machine tools

There is provided a stop valve-carrying rotary nozzle for a machine tool designed to eject a fluid onto the portion of a work which is being worked thereby improving the work-cooling and cutting efficiency of the machine tool. The present rotary nozzle consists of a nozzle body having a throughbore and a spherical member having a throughbore that is in turn fitted within the fluid outlet side of said throughbore of the nozzle body with a sealing O-ring being interposed between the spherical member and the throughbore of the valve body, while allowing a free rotation of the spherical member on its own axis therein. Upon the spherical member having been fitted within the throughbore of the valve body, the annular edge of the valve body is inwardly bent by calking to surroundingly engage the outer half surface of the spherical member, while a portion of the thus inwardly bend annular edge is provided a recess longitudinally extending above and beyond the center of the spherical member and having a width slightly greater than the diameter of the throughbore of the spherical member so that when the rotary nozzle is to be made inoperative, a rod like plug is inserted from outside into the opening mouth of the throughbore of the spherical member and then moved together with the thus fitted spherical member until the plug is inserted between said recess.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to a rotary nozzle for a machine tool, which is used 
to eject a fluid onto a portion to be processed of a work mainly for the 
purpose of improving the work-cooling and cutting capability of the 
machine tool. 
2. Description of the Prior Art 
In general, a machine tool is provided with a plurality of rotary nozzles 
fixed to the circumferential portion of a tool therein (for example, 
ten-odd rotary nozzles on the circumferential portion of a tool), and a 
fluid is ejected from these nozzles at once by opening and closing a flow 
rate regulating valve provided at some other portion of the machine tool, 
to cool a work and improve the cutting efficiency. 
The regulation of the flow rate and velocity of flow of the fluid passing 
through the rotary nozzles is carried out by another regulating valve 
which controls the rotary nozzles collectively, and most of the 
conventional rotary nozzles of this kind do not have valve means. 
The conventional rotary nozzles include a rotary nozzle provided with a 
known flow rate regulating valve at the outlet side thereof but such a 
rotary nozzle is large-sized and excessively high-priced. Moreover, such a 
rotary nozzle is not capable of finely regulating the flow rate of a 
fluid. Consequently, such a rotary nozzle has application problems. 
A rotary nozzle for a machine tool is originally provided with independent 
flow rate regulating functions in many cases. Adding a flow 
rate-regulating valve to such a rotary nozzle means an over-functioning 
rotary nozzle. 
In a machine tool, the overall flow rate of a fluid applied to a portion 
being processed of a work under a certain processing conditions is 
constant, and it is necessary to regulate a maximum flying distance of the 
fluid by increasing and decreasing the velocity of flow thereof. To meet 
these requirements, it is necessary that the rotary nozzle be provided 
with a fluid stop valve means. 
Regarding this requirement, a conventional rotary nozzle generally has no 
functions of regulating a maximum flying distance of a fluid. Some 
conventional rotary nozzle having such functions, which are provided by a 
flow rate regulating valve, are expensive, and have too large diamension. 
SUMMARY OF THE INVENTION 
An object of the present invention is to solve the above-mentioned 
problems. 
To achieve this object, the present invention provides a stop 
valve-carrying rotary nozzles for machine tools, which have the following 
construction. (1) A stop valve-carrying rotary nozzle for a machine tool, 
having a spherical member provided with a through bore passing the center 
of the spherical member, a nozzle body provided with a through bore 
capable of fitting the spherical member in the inner circumferential 
surface of one side portion thereof, and an O-ring annularly contacting 
the spherical member and nozzle body when the spherical member is inserted 
in the through bore in the nozzle body and engaged therewith, wherein the 
portion of the wall of the nozzle body which defines the through bore 
therein is provided with a recess which extends from the end surface of 
the wall to a position beyond the center of the spherical member fitted in 
the nozzle body, and which has a width larger than the diameter of the 
through bore in the spherical member, the spherical member and nozzle body 
being fixed to each other by calking after the spherical member has been 
fitted in the nozzle body, the O-ring being in engagement in an 
elastically deformed state with the nozzle body and spherical member. (2) 
A stop valve-carrying rotary nozzle for a machine tool according to the 
invention (1), wherein a cylindrical guide tube is fitted firmly in an 
outer portion of the through bore in the spherical member, the outer 
diameter of the guide tube being set smaller than the width of the recess 
in the nozzle body. 
The above and other objects as well as advantageous features of the 
invention will become apparent from the following description of the 
preferred embodiments taken in conjunction with the accompanying drawings.

A through bore 1c is formed in a nozzle body 1, axially one side portion of 
which has a cross-sectionally hexagonal outer circumferential surface, and 
the other side portion of which has a thread 1b on its outer 
circumferential surface formed to an outer diameter smaller than that of 
the hexagonal portion. The diameter of the part of the through bore 1c 
which is in the portion having a hexagonal outer circumferential surface 
is set smaller than that of the part thereof which is in the portion 
having the thread 1b. 
In the through bore 1c in the portion of the nozzle body 1 which has a 
hexagonal outer circumferential surface, a spherical member 2 having a 
through bore 2a passing the center of the spherical member 2 is fitted, 
and the spherical member 2 contacts an O-ring 3 inserted in advance in an 
end surface which is formed by the larger-diameter through bore 1C and a 
smaller-diameter through bore 1c in the nozzle body 1, and which is on the 
side of the larger-diameter through bore 1c. 
The spherical member 2 projects slightly from the nozzle body 1. Since the 
nozzle body 1 and spherical member 2 are combined firmly by calking one 
end surface of the tapered thin-wall part of the former, the rotary nozzle 
can be manufactured at a low cost. 
A plurality of rotary nozzles are fixed to predetermined portions of a 
machine tool by utilizing the thread 1b on the nozzle body 1 of each 
thereof. A fluid is sent into the through bore 1c into the portion of the 
nozzle body which has the thread 1b, and ejected from the through bore 2a 
in the spherical member 2. The leakage of the fluid from the nozzle body 1 
is prevented by the O-ring 3 contacting two parts, i.e., the nozzle body 1 
and spherical member 2. 
Therefore, if the quantity of the axial displacement of the calked nozzle 
body 1 and spherical member 2 is not larger than that of the elastic 
deformation of the O-ring, the sealing effect of the O-ring can be 
displayed. Accordingly, the accuracy of the calking of the nozzle body 1 
can be low, and the rotary nozzle can be manufactured at a low cost. 
A recess 1a is formed at one portion of the nozzle body 1 so as to extend 
in the axial direction thereof from a calked portion 1d to the hexagonal 
ouer circumferential surface of the nozzle body 1. In order to move the 
through bore 2a in the spherical member 2 to a substantially vertical 
position shown by two-dot chain lines, for stopping the fluid passing 
through the rotary nozzle, a rod type member is inserted into the through 
bore 2a in the spherical member 2 and then moved so as to be fitted in the 
recess 1a in the nozzle body 1. Consequently, the through bore 2a in the 
spherical member 2 is moved from a position closer to the O-ring 3 to a 
position on the side of the calked portion 1d, so that the ejection of the 
fluid can be interrupted. 
When it is necessary to increase the velocity of flow of the fluid in the 
rotary nozzles having the above-mentioned functions and fixed to a machine 
tool, a thinned-out operation of the rotary nozzles may be carried out, 
i.e., the ejection of the fluid from a suitable number of rotary nozzles 
may be interrupted. 
FIG. 2 is a side elevation of what is shown in FIG. 1. The recess 1a with a 
circular ballon in the nozzle body 1 is made by using an end mill before 
the spherical member 2 has been inserted in the nozzle body 1. 
FIG. 3 is a front elevation of a second embodiment of the present 
invention. This drawing shows the embodiment with a flow of a fluid 
stopped. A through bore 2a in the spherical member 2 is provided with a 
stepped portion, and a cylindrical guide tube 4 is press fitted in a 
larger-diameter portion of this stepped through bore 2a. 
The embodiment shown in the drawing has two recesses 1a at the upper and 
lower portions of the nozzle body 1. Such recesses can be formed at not 
less than three portions of the nozzle body 1 as necessary. 
In the second embodiment, the passage of the fluid can be stopped by 
inserting the guide tube 4 from the recess 1a in the nozzle body 1. 
Accordingly, the operation efficiency can be improved, and an excellent 
directional stability of the fluid being ejected through the guide tube 4 
can be obtained. 
FIG. 4 is a top plan of what is shown in FIG. 3. The depth of the recess 1a 
may be set to a level which allows the axis of the guide tube 4 engaged 
with the recess 1a to extend at substantially right angle to the axis of 
the through bore 1c in the nozzle body 1. 
The guide tube 4 may be set firmly in the spherical member 2 by not only 
the press fitting but also various other kinds of methods, such as 
screwing and welding. 
The present invention has the following benefits. 
(1) In the case where a plurality of rotary nozzles are fixed to the 
portion of a machine tool which is in the vicinity of a processing portion 
thereof, the overall velocity of flow of the fluid can be regulated. 
(2) The stopping and ejecting of the fluid can be done easily. 
(3) The rotary nozzle can be manufactured at a low cost. 
(4) A light, miniaturized rotary nozzle can be obtained. 
The present invention is not, of course, limited to the above embodiments; 
it may be modified in various ways within the scope of the appended 
claims.