JPH0677757U - Falling pipe for sprinkler head - Google Patents

Abstract

(57) [Summary] [Purpose] The sprinkler head can be easily installed, and there is no water leakage from the sprinkler head installation part. Moreover, when the ceiling is attached after the sprinkler head is installed, the ceiling plate touches the falling pipes. However, the sprinkler head does not fall off. [Structure] The joint portion 4 for mounting the sprinkler head S is a cylindrical inner wall having no screw, and a ball 8 as a locking member is installed in the joint portion so as to be able to move in and out, and a ball is provided outside the joint portion. A falling tube for a sprinkler head in which a sliding cylinder 11 for locking is installed, and a guard 15 for preventing the sliding cylinder from moving due to an erroneous operation is installed outside the sliding cylinder.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a falling pipe for attaching a sprinkler head for extinguishing a fire.

[0002]

[Prior art]

 As shown in Fig. 5, a conventional falling pipe for a sprinkler head (hereinafter, simply referred to as "falling pipe") has a different-diameter joint R called a reducer screwed onto the end of a pipe P, and the female screw of this reducer It was attached by screwing the male screw of the sprinkler head S. Since the fire-extinguishing liquid should never leak from the attachment part of the sprinkler head and the fall pipe, roll the seal tape around the male screw of the sprinkler head or apply the sealant and then fall the sprinkler head. It was attached to the tube.

[0003]

[Problems to be solved by the device]

 Since the fall pipe is located at a high place in the room, the sprinkler head had to be installed in an unstable place with scaffolding or stepladders, which made work difficult. Moreover, this installation made the work even more difficult because the male screw of the sprinkler head, which had been thickened with sealing tape or sealing agent, had to be screwed into the female screw of the falling pipe.

Since the sprinkler head and the falling pipe, which are difficult to mount in such a place where work is difficult to use, are used, the sprinkler head is often dropped during the work. In the sprinkler head dropped from a high place, the most important component, the heat-sensitive decomposition part, was damaged, which could lead to a violent accident or water leak after installation.

Further, a special tool (wrench) is used to attach the sprinkler head, but at this time, depending on how the operator puts in force, the screwing may be insufficient, or conversely, it may be tightened more than necessary. was there.

If the screwing of the sprinkler head is insufficient at the time of attachment, water leakage may occur, or the protrusion of the sprinkler head from the ceiling surface may become large, resulting in an unaesthetic appearance.

[0007] On the other hand, if the sprinkler head is tightened too much when it is attached, the reducer and sprinkler head threads will be destroyed, and screwing will not be able to be performed completely, which may cause water leakage, or the sprinkler head may not be inside the ceiling. Sometimes it entered too much, and when a fire broke out, the ceiling was obstructed and normal spraying could not be performed.

The present invention has been made in view of these drawbacks of the conventional fall pipe, and it is an object of the present invention to provide a fall pipe that can be easily attached and can be completely attached by anyone.

[0009]

[Means for Solving the Problems]

 The inventor of the present invention must drop the sprinkler head during the work of installing the sprinkler head, or the water leakage accident after the installation is because the installation of the sprinkler head and the falling pipe is done by screwing. The present invention has been completed, focusing on the fact that these drawbacks are eliminated.

According to the present invention, the inside of the pipe is a joint part into which the sprinkler head can be inserted, and the joint part is provided with a locking member capable of locking the inserted sprinkler head. A sliding cylinder that locks the locking member is installed on the outside of the sliding door with the spring urged downward, and a guard whose lower end protrudes below the lower end of the sliding cylinder is installed outside the sliding cylinder. It is a falling pipe for sprinkler heads.

[0011]

【Example】

 Hereinafter, the present invention will be described based on examples. FIG. 1 is a perspective sectional view for explaining attachment of a sprinkler head to a falling pipe of the present invention, FIG. 2 is a front sectional view of attaching a sprinkler head to a falling pipe of the present invention, and FIGS. It is an expansion perspective view of the guard installed in the fall pipe of a plan.

In the falling pipe 1, the inside of the pipe 2 is a step 3 whose lower part has a slightly thicker diameter, and the thicker part is a joint part 4 into which the sprinkler head is inserted. An annular groove 5 is formed in the joint portion 4 at a position slightly lower than the step 3, and an O-ring 6 is embedded in the annular groove in a slightly protruding state.

A plurality of holes 7 tapering inward are formed below the O-ring 6, and balls 8 serving as locking members are installed in the holes. The diameter of the tapered portion of the hole 7 is smaller than the diameter of the ball 8 so that the ball slightly projects inward but does not drop inward.

A step 9 is formed on the outer side of the joint portion 4, and the outer diameter of the lower part of the step 9 is smaller than that of the upper part. An annular groove is formed in the outer lower portion of the pipe 2, and a ring spring 10 is fitted in the annular groove in a slightly protruding state.

A sliding cylinder 11 is slidably installed below the outside of the pipe 2. Inside the sliding cylinder 11, there is formed a step 12 in which the lower part has a small diameter and the upper part has a large diameter. The upper part slides along the large diameter part of the pipe 2 and the lower part slides along the small diameter part of the pipe. It is like this.

A compression spring 13 is installed between the step 9 of the pipe 2 and the step 12 of the sliding cylinder 11 so that the sliding cylinder 11 is constantly urged downward. An annular notch 14 is formed inside the lower end of the sliding cylinder 11, and the upper end of the notch hits the projecting portion of the ring panel 10 and is biased downward by a spring. It is locked.

A guard 15 is installed outside the sliding cylinder 11 so as not to interfere with the sliding of the sliding cylinder. The lower end of the guard 15 is located at the same position as the lower end of the sliding cylinder 11 or a little lower than that. The guard 15 is installed by screwing a female thread 18 of the guard into an external thread 17 of a flange 16 formed on the pipe 2.

The sprinkler head attached to the falling pipe of the present invention does not have a male screw threaded to the mounting portion as shown in FIG. 5, but the mounting portion T is inserted into the joint portion as shown in FIGS. It has a cylindrical shape. The mounting portion T of the sprinkler head S is provided with an annular groove M having an arc cross section at the same distance as the distance from the step 3 of the falling pipe to the ball 8.

In order to mount the above sprinkler head on the falling pipe of the present invention, first, the slide cylinder 11 is moved upward (arrow A) against the spring bias until the notch 14 is located at the ball 8. Push up. Then, the ball 8 that has been pushed out to the inner wall of the sliding cylinder 11 and slightly protruded inward of the joint portion 4 can be retracted into the notch 14. In this state, the sprinkler head S is inserted (arrow B) until the upper end of the mounting portion T contacts the step 3. At this time, the annular groove M of the sprinkler head S and the ball 8 of the joint portion 4 are aligned with each other, and the O-ring 6 comes into close contact with the attachment portion T of the sprinkler head. Then, when the sliding cylinder 11 is returned to the lower side by the spring bias, the ball 8 is pushed by the inner wall of the sliding cylinder 11 and locked in a state where a part thereof protrudes inward, so that the ball 8 is fitted into the annular groove M of the sprinkler head. As a result, the sprinkler head will not come out of the joint.

The guard 15 installed on the falling pipe of the present invention is a safety device that prevents the sprinkler head mounted on the falling pipe from accidentally pushing the sliding cylinder upward. In other words, the current method of constructing a ceiling in a building is to attach the sprinkler head to the falling pipe and then attach the ceiling plate, which is called the pre-attachment method, but in this method, there is a hole to project the sprinkler head. When attaching the opened ceiling plate by aligning the sprinkler head with the hole, the sliding tube is lifted by the ceiling plate, and the sprinkler head is unmated, causing the sprinkler head to drop. However, if there is a guard on the outside of the sliding cylinder, the guard prevents it even if the ceiling plate tries to lift the sliding cylinder, and the sprinkler head should be dropped no matter how the ceiling plate falls and contacts the pipe periphery. Nothing goes away.

The guard used in the present invention may have any shape and structure as long as the sliding cylinder cannot be lifted by the ceiling plate when the ceiling plate is attached. The guard shown in FIGS. 1 to 3 is a cylindrical body, and the guard shown in FIG. 4 has a plurality of legs 19 ... When the guard is composed of a plurality of legs, the sliding body can be lifted from between the legs when the sprinkler head is attached, which makes it easier to attach the sprinkler head.

The guard may be installed by screwing the guard to the pipe as in the embodiment, integrally molding with the pipe, or elastically if the guard is made of resin. It may be fitted.

[0025]

[Effect of device]

 As described above, the falling pipe of the present invention facilitates the attachment of the sprinkler head, so that the sprinkler head is not dropped when the sprinkler head is attached, and the sprinkler head is attached by the pre-attachment method. When the ceiling plate is attached later, even if the ceiling plate comes into contact with an unnecessary place, the sprinkler head does not drop, which is an excellent effect that has never been achieved.

[Brief description of drawings]

FIG. 1 is a perspective sectional view illustrating the attachment of a sprinkler head to a falling tube of the present invention.

FIG. 2 is a front sectional view in which a sprinkler head is attached to the falling pipe of the present invention.

FIG. 3 is an enlarged perspective view of an example of a guard installed on the falling pipe of the present invention.

FIG. 4 is an enlarged perspective view of another example of the guard installed on the falling pipe of the present invention.

FIG. 5 is a view for explaining a mounting state of a conventional fall pipe and a sprinkler head.

[Explanation of symbols]

 1 Falling pipe 2 Pipe 4 Joint part 8 Ball 11 Sliding cylinder 13 Compression spring 15 Guard S Sprinkler head T Sprinkler head mounting part M Annular groove

Claims (3)

[Scope of utility model registration request] 1. The inside of the pipe is a joint portion into which the sprinkler head can be inserted, and the joint portion is provided with a locking member capable of locking the inserted sprinkler head, and the outside of the pipe. A sliding cylinder that locks the locking member is installed downwardly biased by a spring, and a guard whose lower end projects below the lower end of the sliding cylinder is installed outside the sliding cylinder. Falling pipe for sprinkler head. 2. The fall tube for a sprinkler head according to claim 1, wherein the guard is a cylindrical body. 3. The fall tube for a sprinkler head according to claim 1, wherein the guard is a plurality of legs.