JP2589343Y2 - Falling tube for sprinkler head - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a falling pipe for mounting a sprinkler head for fire extinguishing.

[0002]

2. Description of the Related Art A conventional falling pipe for a sprinkler head (hereinafter simply referred to as a "falling pipe") is formed by screwing a reducing diameter joint R called a reducer to a tip of a pipe P as shown in FIG. The female screw of the sprinkler head S was screwed and attached. The fire extinguishing solution must not leak from the sprinkler head / falling pipe mounting area.Therefore, wrap the sprinkler head's internal thread with sealing tape or apply a sealant, and then attach the sprinkler head to the falling pipe. I was attached.

[0003]

[Problems to be solved by the present invention] Since the falling pipe is located at a high place in the room, the installation of the sprinkler head must be performed in an unstable place by setting up a scaffold or preparing a stepladder, which is difficult to work. Met. In addition, this installation further complicates the work because the male screw of the sprinkler head, which has been thickened with sealing tape or a sealant, must be screwed into the female screw of the falling pipe.

[0004] Since the sprinkler head and the falling pipe which are difficult to attach in the place where the work is difficult are used, the sprinkler head is often dropped during the work. When the sprinkler head was dropped from a high place, the most important part, the heat-sensitive decomposition part, was damaged, which sometimes caused an explosion or water leakage after installation.

[0005] In addition, a special tool (wrench) is used to attach the sprinkler head. At this time, depending on how much force is applied by the operator, the screwing may be insufficient, or conversely, may be excessively tightened. was there.

[0006] If the screwing of the sprinkler head at the time of attachment is insufficient, water leakage occurs and the projection of the sprinkler head from the ceiling surface becomes large, and the aesthetic appearance is impaired.

On the other hand, if the tightening at the time of mounting the sprinkler head is too strong, the threads of the reducer and the sprinkler head will be destroyed, and screwing will not be possible completely.
Again, this could cause water leakage, or the sprinkler head could get too far into the ceiling, disturbing the ceiling during a fire and preventing normal spraying.

SUMMARY OF THE INVENTION The present invention has been made in view of these drawbacks of the conventional falling pipe, and has as its object to provide a falling pipe which is easy to install and can be completely installed by anyone.

[0009]

SUMMARY OF THE INVENTION The present inventor has found that the sprinkler head is dropped during the mounting work of the sprinkler head, or a water leakage accident occurs after the mounting because the sprinkler head and the falling pipe are screwed together. Accordingly, the present invention was completed by focusing on the fact that these drawbacks would be eliminated if the attachment was not screwed.

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

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
FIG. 1 is a perspective sectional view illustrating attachment of a sprinkler head to the falling pipe of the present invention, FIG. 2 is a front sectional view of attaching the sprinkler head to the falling pipe of the present invention, and FIGS. It is an expansion perspective view of the guard installed in a falling pipe.

The falling pipe 1 has a step 3 in which the inside of the pipe 2 has a slightly thicker lower part, and the thicker part is a joint 4 into which a sprinkler head is inserted. An annular groove 5 is formed in the joint portion 4 at a position slightly below the step 3, and an O-ring 6 is formed in the annular groove.
Is embedded 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 provided 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 fall inward.

A step 9 is formed on the outside of the joint portion 4, and a lower portion of the step 9 has a slightly smaller outer diameter than an upper portion. An annular groove is engraved in the lower part of the outside of the pipe 2, and a ring spring 10 is fitted into the annular groove so as to protrude slightly.

A sliding cylinder 11 is slidably provided below the outside of the pipe 2. A step 12 having a small diameter at the lower part and a large diameter at the upper part is formed inside the sliding cylinder 11 so that 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 has become.

A compression spring 13 is provided 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 biased downward. Sliding cylinder 11
An annular notch 14 is formed inside the lower end of the sliding cylinder 11, and the upper end of the notch abuts the projecting portion of the ring spring 10 to lock the sliding cylinder 11 urged downward by a spring.

A guard 15 is provided outside the sliding cylinder 11 so as not to hinder sliding of the sliding cylinder. Guard 1
In 5, the lower end protrudes at the same position as the lower end of the sliding cylinder 11 or slightly below it. Installation of guard 15
This is performed by screwing a female screw 18 of a guard to a male screw 17 of a flange 16 formed on the pipe 2.

The sprinkler head to be attached to the falling pipe according to the present invention does not have a male screw threaded at 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. At the mounting portion T of the sprinkler head S, an annular groove M having a circular cross section is formed at the same distance as the distance from the step 3 of the falling pipe to the ball 8.

In order to attach the sprinkler head to the falling pipe of the present invention, first, the sliding cylinder 11 is pushed upward (arrow A) against the bias of the spring until the notch 14 reaches the position of the ball 8. Then, until then, the sliding cylinder 11
The ball 8 which has been pushed out from the inner wall and slightly protruded inward from the joint portion 4 can be retracted into the notch 14. When this state is reached, the sprinkler head S is inserted (arrow B) until the upper end of the mounting portion T comes into contact with the step 3. At this time, the sprinkler head S
The annular groove M 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 mounting portion T of the sprinkler head. When the sliding cylinder 11 is returned downward by the bias of the spring, the ball 8 is pressed by the inner wall of the sliding cylinder 11 and locked in a state where a part thereof protrudes inward, and is fitted into the annular groove M of the sprinkler head. As a result, the sprinkler head does not come off the joint.

Guard 1 installed on falling pipe of the present invention
Reference numeral 5 denotes a safety device for preventing the sprinkler head attached to the falling pipe from inadvertently pushing the sliding cylinder upward. In other words, the current construction method for ceilings in buildings is to attach the sprinkler head to the falling pipe and then attach the ceiling plate, which is called the pre-applied method, but in this method there is a hole for projecting the sprinkler head. When attaching the sprinkler head to the hole with the sprinkler head aligned with the hole, the sliding cylinder is lifted by the ceiling plate, and the sprinkler head is released and the sprinkler head is dropped.
However, if there is a guard outside the sliding cylinder, the guard prevents the sliding cylinder from being lifted by the ceiling plate, and the sprinkler head drops even if the ceiling plate falls and contacts the pipe periphery. No more.

The guard used in the present invention can 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. If the guard has multiple legs, when attaching the sprinkler head,
Since the sliding body can be lifted from between the legs, attachment of the sprinkler head is further facilitated.

The guard may be installed by screwing the guard to the pipe as in the embodiment, by molding it integrally with the pipe, or by elastically fitting a resin guard. They may be combined.

[0025]

As described above, the falling pipe of the present invention not only prevents the sprinkler head from dropping when the sprinkler head is mounted, but also allows the sprinkler head to be attached by the pre-installation method in order to facilitate the installation of the sprinkler head. When the ceiling plate is attached after the attachment, even if the ceiling plate comes into contact with an unnecessary portion, the sprinkler head does not fall down, which is an excellent effect that has not been achieved in the past.

[Brief description of the drawings]

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

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

FIG. 3 is an enlarged perspective view of an example of a guard installed on a falling pipe according to 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 state in which a conventional falling pipe and a sprinkler head are mounted.

[Explanation of symbols]

 DESCRIPTION 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)

(57) [Scope of request for utility model registration] An inner portion of a pipe is a joint portion into which a sprinkler head can be inserted, and a locking member capable of locking the inserted sprinkler head is installed in the joint portion. The sliding cylinder that locks the locking member is installed with a spring bias downward, and a guard whose lower end protrudes below the lower end of the sliding cylinder is installed outside the sliding cylinder. A falling pipe for a sprinkler head. 2. The fall pipe for a sprinkler head according to claim 1, wherein said 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.