JPH0568272B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method of manufacturing a frame for a flash type sprinkler head in which a deflector falls from the main body when a fire breaks out, thereby uniformly distributing extinguishing fluid.

Conventional technology Conventional flash sprinkler heads are
The cylindrical frame a, which is screwed onto the head body that is attached to the water supply pipe in the ceiling, is cut into the shape shown in Figure 8 using a lathe using a round bar or pipe material such as brass, or by pressing a metal plate. It has a structure in which a flange part b is formed on the inner periphery of the lower end of a cylindrical body a, and a load adjustment slit c is formed on the circumferential side wall of the cylindrical body.
Then, the two arms of the thermal decomposition section made of a link mechanism having a low melting point alloy are engaged and supported in the flange part b, and a through hole d is provided in the flange part b, and the connecting rod of the deflector is inserted into the through hole d. The connecting rod of the deflector slides down inside the through hole d, and at the same time as the heat-sensitive decomposition part decomposes and scatters, the extinguishing liquid spouted from the nozzle of the head body collides with the deflector. Uniform dispersion is being carried out.

Problems to be Solved by the Invention The above-mentioned conventional cylindrical frame a is formed by cutting a round bar material or pipe material with a lathe to form the frame a having a flange portion b, or by pressing a metal plate. The frame a is formed into a frame a having a flange part b, but in order to provide the load adjustment slit c on the peripheral side wall of the frame a, it must be processed in a separate process using a separate machine, or by using a sophisticated machine tool. It is expensive because it requires the use of

Furthermore, a loading slit c is placed on the circumferential wall of the cylindrical body.
In addition, it is difficult to drill the through holes d for inserting the connecting rods of the deflector in the flange portion b in the prescribed manner, and as a result, when the thermal decomposition part operates and scatters, and at the same time the deflector falls, the connecting rods of the deflector or There is a problem in that the stopper ring attached to the connecting rod does not work properly and falls diagonally, making it impossible to uniformly spray the extinguishing liquid.

Means for Solving the Problems The present invention manufactures the above-mentioned cylindrical frame, and the outer circumferential shape is a perfect circle, while the inner circumferential shape is made of a large diameter part and a small diameter part that have almost the same shape as the base plate of the arm guide. A deformed pipe is formed with a through hole having a semicircular groove for guiding the connecting rod of the deflector in the small diameter part, a slit part in the outer peripheral side wall, and a slit part in the lower edge of the inner peripheral side wall. This is a method of manufacturing a frame for a flash type sprinkler head, in which a locking portion of a stop ring of a deflector is formed by outer diameter machining and inner diameter machining, respectively.

Function By cutting the outer and inner circumferential surfaces of an irregularly shaped pipe with different outer and inner circumferential shapes from the side and top surfaces, a load adjustment slit is formed on the circumferential side and a stopper ring for the deflector is seated at the lower end of the inner circumferential surface. The locking part can be formed in one step.

Embodiment An embodiment of the present invention will be explained with reference to FIGS. 1 to 5. As shown in FIG. It is formed into an irregularly shaped pipe 1. This irregularly shaped pipe 1 has an outer circumferential shape 2 that is a perfect circle, and an inner circumferential shape 3.
are formed in the large diameter portion 3a and the small diameter portion 3b. The shape of the inner circumference formed by the large diameter portion 3a and the small diameter portion 3b is approximately the same as the shape of the base plate 13a of the arm guide 13 that holds the valve body 12 that closes the nozzle portion of the head body 11. Further, in the embodiment, three semicircular grooves 4 for slidingly supporting the connecting rods 17 of the deflector 15 are provided in the small diameter portion 3b, the same number as the connecting rods 17.

The central part of the outer circumferential surface 2 and the inner circumferential surface 3 of the irregularly shaped pipe 1 formed in this way are cut using a lathe (not shown).
The outer peripheral surface 2 is cut so that a flange is formed to form the locking part 9 of the stopper ring 16 of No. 5.
In cutting, since the small diameter part 3b is formed thicker than the large diameter part 3a, even if the slit 6 is formed in the side wall of the large diameter part 3a, the frame 10 with the outer circumferential side wall 5 remaining can be cut into the small diameter part 3b. A threaded portion 8 is formed on the outer periphery of the upper end of the frame 10 and is screwed into the head body 11.
A corner cut 8 is provided at the lower end of the threaded portion 8.
a.

Frame 10 manufactured by the above method
is attached to the head body 11 together with the parts shown in FIG.
1 is loaded, a link cylinder and a low melting point alloy are attached to the link piston 20, and a pyrolysis section is built inside the frame 10, and these are supported by a link presser plate 18, an arm support plate 23, and an arm 19. The head 19a of the arm 19 is suspended from the arm locking portion 7 of the frame 10, and heat-sensitive plates 24 and 25 are attached to the lower end of the link piston 20 to form a sprinkler head.

In the figure, reference numeral 14 denotes a balancer, and the deflector 15 is provided with a through hole 15a so that the leg portion 13b of the arm guide 13 can protrude downward.

Effects of the Invention This invention forms a base material of a frame into an irregularly shaped pipe 1 whose inner diameter part has a large diameter part 3a, a small diameter part 3b, and a semicircular groove 4 in the small diameter part 3b, and the irregularly shaped pipe 1. The slit 6 can be easily provided by machining the outside diameter.

In addition, since a guide for the connecting rod 17 of the deflector 15 consisting of a semicircular groove 4 is provided in the small diameter portion 3b, the inner diameter can be machined at the locking portion 7 of the stopper ring 16.
By simply providing the connecting rod 17, there is no need to process the guide hole of the connecting rod 17.

Further, by machining the outer diameter of the irregularly shaped pipe 1, the height of the slit 6, the width and height of the arm locking portion 7, etc. can be freely changed. By corner cutting 8a at the lower end of the threaded portion 8, a pool of adhesive is created when the head is assembled with the main body, so there is no need to drill a hole for the adhesive pool as in the conventional case.

For the above purpose, all the processing according to the present invention can be easily performed using only a general simple lathe, so it is inexpensive.

[Brief explanation of the drawing]

The figures show an embodiment of the method for manufacturing a frame for a flash type sprinkler head according to the present invention. Figure 1 is a partially omitted perspective view of the deformed pipe of the present invention, and Figure 2 shows the same state in which it has been cut. Perspective view,
Figure 3 is a plan view, Figure 4 is a sectional view taken along the - line in Figure 3, Figure 5 is a side view of Figure 3, Figure 6 is a parts diagram of the sprinkler head, and Figure 7 is a diagram of the sprinkler head. 8 is a perspective view of a conventional frame, FIG. 9 is a plan view thereof, FIG. 10 is a bottom view, and FIG. 11 is a longitudinal sectional view. DESCRIPTION OF SYMBOLS 1... Unusual pipe, 2... Outer circumference shape, 3... Inner circumference shape, 3a... Large diameter part, 3b... Small diameter part, 4...
...Semicircular groove, 5...Outer peripheral side wall, 6...Slit portion, 7...Arm locking portion, 8...Threaded portion, 8a...
... Corner cut, 9 ... Stopper ring locking part, 10 ... Frame.

Claims (1)

[Scope of Claims] 1. An irregularly shaped pipe with different outer and inner circumferential shapes is formed, and a slit portion is formed on the outer peripheral side wall of the irregularly shaped pipe, and a locking portion of a stop ring is machined on the lower edge of the inner peripheral wall. and a method for manufacturing a frame of a flash type sprinkler head, characterized in that the frame is formed by internal diameter processing. 2. The method of manufacturing a frame for a flash type sprinkler head according to claim 1, wherein the outer peripheral shape of the irregularly shaped pipe is a perfect circle. 3. Manufacture of a flash type sprinkler head according to claim 1, characterized in that the inner peripheral shape of the irregularly shaped pipe consists of a large diameter part and a small diameter part, and the small diameter part consists of a through hole with a semicircular groove. Method. 4. The method of manufacturing a frame for a flash type sprinkler head according to claim 1, wherein the irregularly shaped pipe having a different outer circumferential shape and an inner circumferential shape is formed by extrusion processing.