JP2559569Y2 - Protective cap for sprinkler head and removal jig for protective cap - Google Patents

Description

[Detailed description of the invention]

[0001]

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

[0002]

2. Description of the Related Art In a fire extinguisher sprinkler head, when a thermosensitive decomposition portion provided at the tip of the head reaches a certain temperature or more, the internal low melting metal is melted, and the thermosensitive decomposition portion is decomposed to open a valve, and the pipe is opened. The fire is extinguished by sprinkling the filled water. That is, the water pressure of the water filled in the pipe is constantly applied to the sprinkler head, and this water is in a state where the thermosensitive decomposition portion of the head is sealing. Therefore, if the thermal decomposition part is damaged,
This may cause accidents such as water leaks and watering accidents.However, the thermal decomposition part is a part that senses the flame, so it is exposed at the tip of the head. Drop the sprinkler head during installation,
If a physical shock is applied to the thermal decomposition part from outside by hitting a wrench or the like, this part is often damaged.

[0003] In order to protect the thermal decomposition portion from such external physical impact, a protective cap for covering the thermal decomposition portion is generally fitted to the sprinkler head. The transport of the sprinkler head and the attachment to the falling pipe are performed while the protective cap is fitted, the sprinkler head is attached to the falling pipe, the ceiling is stretched, and then the protective cap is removed. .

Conventionally, the operation of removing the protective cap is performed by a worker standing on a stepladder with bare hands, or, as shown in FIG. 8, a groove a is provided on the outer periphery of the protective cap and engaged with the groove a. A method has been employed in which the groove a is hooked by a removal jig Z having a holding piece as described above, and the groove a is pulled straight down to remove the protective cap.

[0005]

However, it is very difficult to work on all of the many sprinkler heads while standing on a stepladder, and the protective cap is fitted tightly to the sprinkler head. It is very difficult to remove it with bare hands because it has little exposure from the ceiling, is small in diameter, and is slippery.

In a protective cap provided with a groove, the protective cap is pulled straight downward by a jig and removed. When the protective cap is fitted very tightly to the sprinkler head, a downward force is applied. The sprinkler head cannot be removed just by adding it, and it can be removed by rocking the jig or applying a downward impact many times while the jig is engaged with the protective cap. The falling pipe that is attached is distorted,
There has been a problem that the mounting direction of the sprinkler head is shifted. On the other hand, the protective cap must be firmly fitted to the sprinkler head so as not to be easily detached at the time of mounting work or the like, and it is not preferable that the protective cap is previously loosely fitted to make the protective cap easy to remove.

In such a case, a force for rotating the protective cap about its axis may be applied by some means. When the protective cap is rotated by such a force, the protective cap is applied to the sprinkler head by a static friction force. The state of firmly fitting is changed to the state of fitting with dynamic frictional force. In this state, if the protective cap is pulled down, the protective cap can be easily removed. That is, if the protective cap is twisted and removed, the above-described inconvenience can be avoided.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. As described in the first aspect, a plate on a chord passing through the center of a bottom surface outside a bottomed cylindrical protective cap is provided. An engagement portion having a rectangular shape is provided upright, and an engagement hole is provided in the engagement portion.

In the protective cap, a thread groove which is a reverse thread to the thread groove of the falling pipe for mounting the sprinkler head is engaged with the outer peripheral surface of the sprinkler head. It is desirable to provide on the inner peripheral surface.

As a jig for removing the protective cap, there is provided an engaging piece formed to be able to engage with an engaging hole provided in an engaging portion of the protective cap. The engaging piece is provided with a claw that bends toward the lower end of the engaging portion of the protective cap.

Alternatively, at least one groove, protrusion, or chamfer is provided along a generatrix on the outer periphery of the bottomed cylindrical protective cap to engage with the outer peripheral surface of the sprinkler head. The protection cap is provided with a thread groove on the inner peripheral surface thereof, which is a reverse thread to the thread groove of the falling pipe for mounting the sprinkler head.

A jig for removing the protective cap is provided with a cylindrical portion having a shape such that the inner peripheral surface of the bottomed cylindrical shape is engaged with the outer peripheral surface of the protective cap. Using

The protective cap for a sprinkler head according to claim 1 or 2 and the jig for removing the protective cap according to claim 3, the protective cap for a sprinkler head according to claim 4, and the protective cap for claim 5. Although the removal jig for the protective cap has a different construction requirement, it has a common industrial application in terms of the protective cap for the sprinkler head, and the protective cap is twisted from the sprinkler head. The problem is the same as the problem of adding and removing.

As described above, the following effects can be obtained by erecting the plate-shaped engaging portion provided with the engaging hole on the diameter of the bottom surface of the protective cap for the sprinkler head. That is, the engaging piece of the removal jig is inserted into the engaging hole of the protective cap, and the hook of the engaging piece is hooked and engaged with the engaging portion of the protective cap. Then, the removal jig is rotated about the axis of the protective cap. Then, by the rotation of the removal jig, the protection cap engaged with the engagement piece of the removal jig also rotates. In this state, the removal jig is pulled down, and the protection cap is removed from the sprinkler head. Remove. That is, the protective cap can be removed by twisting.

Further, by providing a thread groove on the inner peripheral surface of the protective cap which engages with the outer peripheral surface of the sprinkler head so as to have a reverse thread to the thread groove of the falling pipe for mounting the sprinkler head. It has the following effects. First, the sprinkler head can be threaded to engage this thread and the protective cap can be threaded onto the sprinkler head. Then, the protective cap can be removed by engaging the engaging piece of the removal jig with the engaging hole of the protective cap and rotating the protective cap in a direction in which the screw with the sprinkler head can be released. At this time, since the screw groove of the protective cap has a reverse thread to the screw groove of the falling pipe for attaching the sprinkler head, the direction in which the removal jig is rotated is the direction in which the sprinkler head is screwed into the falling pipe. Becomes

Further, at least one groove, projection or chamfer is provided along a generatrix on the outer peripheral surface of the protective cap,
As described above, the protective cap is provided on the inner peripheral surface of the protective cap that engages with the outer peripheral surface of the sprinkler head by providing a thread groove that is reversely threaded to the thread groove of the falling pipe to which the sprinkler head is attached. Can be screwed into the sprinkler head as well as the above, by engaging the cylindrical part of the removal jig with the outer periphery of the protection cap and rotating the removal jig to release this screw, the protection cap Can be removed from the sprinkler head. Of course, since the thread groove of the protective cap is reverse-threaded to the thread groove of the falling pipe for attaching the sprinkler head, the direction in which the removal jig is rotated is the direction in which the sprinkler head is screwed into the falling pipe. is there.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. (Embodiment 1) The protective cap 2 used for the sprinkler head 1 according to the present embodiment is a bottomed cylindrical shape, and the inner diameter thereof is the body 1a of the sprinkler head 1.
The protective cap 2 has a diameter substantially equal to the outer diameter of the sprinkler head 1 and is closely fitted to the sprinkler head 1. As shown in FIG. 1, a plate-like engaging portion 4 is provided upright on a chord passing through the center of the outer bottom surface of the protective cap, and the engaging portion 4 is provided with a slit-like engaging hole 5. It is. Further, projections 6 are provided at both end portions of the engaging portion 4 to mark holes in the ceiling when the ceiling is buried in the ceiling.

From the time of carrying out, the protective cap 2 is in a state of being fitted to the sprinkler head 1, and in this state, as shown in FIG. 1, the female screw portion of the falling pipe 3 leading to the pipe for supplying water. The sprinkler head 1 is fixed to the falling pipe 3 by screwing a male screw portion 1b provided on the upper portion of the sprinkler head 1 into the sprinkler head 3b. Then, a ceiling with a hole through which the sprinkler head 1 passes is set in a predetermined position, and then the protective cap 2 is removed from the sprinkler head 1.

The removal jig 7 according to the present embodiment is used for removing the protective cap 2 from the sprinkler head 1. The removal jig 7 has a width w slightly smaller than the width d of the engagement hole 5 of the protective cap 2 as shown in FIG.
The protective cap 2 has an engaging piece 9 having a claw 8 that bends toward the lower end of the engaging portion 4. With this configuration, the engaging piece 9 can be inserted into the engaging hole 5 of the protective cap 2. By hooking the claw 8 on the engaging portion 4 of the protective cap 2, the engaging piece 9 is engaged with the engaging hole 5 of the protective cap 2. Can be combined. The engaging piece 9 is set at the tip of the long handle 10, and a handle 11 is provided at the lower end of the handle 10.

A method for removing the protective cap 2 from the sprinkler head 1 using the removal jig 7 is shown in FIG.
It will be described based on. First, the engaging hole 5 of the engaging portion 4 provided on the outer bottom surface of the protective cap 2 exposed from the ceiling.
Then, the engaging piece 9 of the removal jig 7 is inserted, the claw 8 of the engaging piece 9 is hooked on the engaging portion 4, and the engaging piece 9 is engaged with the engaging hole 5. Then, by rotating the handle portion 11 of the removal jig 7 about the axis of the protection cap 2, the protection cap 2 engaged with the engagement piece 9 of the removal jig 7 is rotated. The protective cap 2 is removed by pulling down the removal jig 7 downward. By rotating the protection cap 2 with the removal jig 7, the protection cap 2 can be changed from a state in which the protection cap 2 is fitted to the sprinkler head 1 with static frictional force to a state in which the protection cap 2 is fitted with dynamic frictional force. Even if the protective cap 2 is firmly fitted to the sprinkler head 1, the protective cap 2 can be easily removed from the sprinkler head 1. As a rule of thumb, it's clear that to remove something that's stuck, twist it and pull it apart. Further, in this method, since the protective cap 2 can be pulled straight down while twisting, no force is applied to the sprinkler head 1 in the lateral direction, and the falling pipe to which the sprinkler head 1 is attached becomes distorted. Also, there is no inconvenience that the mounting direction of the sprinkler head is shifted.

The protective cap 2 according to the first embodiment has a thread groove 2c formed on the inner peripheral surface thereof so as to have a reverse thread to the thread groove 3b 'of the female thread portion 3b of the falling pipe 3 to which the sprinkler head 1 is attached. Is more effective.
This effect will be described with reference to FIG. FIG. 3 is a partial cross-sectional view of the protective cap 2 having the above-described thread groove 2 c provided on the inner peripheral surface thereof, and the sprinkler head 1 fitted with the protective cap 2 and attached to the falling pipe 3. The sprinkler head 1 is provided with a thread 1c that engages with a thread groove 2c provided in the protective cap 2.

With this configuration, the screw groove 2c of the protection cap 2 and the screw thread 1c of the sprinkler head 1 can be screwed together, so that the protection cap 2 can be fixed to the sprinkler head 1 more firmly than the fitting fixation. When removing the protective cap 2 from the sprinkler head 1, the engaging piece 9 of the removing jig 7 is engaged with the engaging hole 5 of the protective cap 2, and the handle 11 of the removing jig 7 is attached to the protective cap 2. The screw cap 2 is rotated in a direction in which the screw thread 2c of the sprinkler head 1 and the screw thread 1c of the sprinkler head 1 can be unscrewed. Since the protective cap 2 and the sprinkler head 1 are screwed together, the detaching operation can be performed very easily rather than forcibly pulling out the fixed and fixed one. The screw groove 2c of the protective cap 2 has a reverse thread to the screw groove 3b 'of the female screw portion 3b of the falling pipe 3 to which the sprinkler head 1 is attached. The rotation direction in which the thread 1c of the head 1 is unscrewed coincides with the rotation direction in which the male screw portion 1b of the sprinkler head 1 is screwed to the female screw portion 3b of the falling pipe 3. Therefore, even if the protective cap 2 is rotated using the removal jig 7 so that the sprinkler head 1 and the sprinkler head 1 can be unscrewed, only the screwing of the sprinkler head 1 and the falling pipe 3 is tightened, and the state is not affected. As a result, there is no problem in mounting the sprinkler head 1 and the falling pipe 3.

In this embodiment, the engaging portion 4 of the protective cap 2
The shape of the engaging hole 5 provided in the opening jig is a horizontally long slit shape, which may be a round hole as shown in FIG. As shown in the drawing, the shape of the bar 9 may be a bar-shaped bar having the claw 8 with its tip bent. Further, as shown in FIG. 4B, two engaging holes 5 may be provided in the engaging portion 4. In this case, the engaging piece 9 of the removing jig 7 is provided by two engaging members of the protective cap 2. Two engagement pieces having substantially the same interval as the mating hole 5 have a U-shape, and one having a claw 8 provided at each end may be used. In short, if the detachable jig 7 having the engaging piece 9 which can be rotated by providing the engaging hole 5 in the plate-shaped engaging portion 4 of the protective cap 2 and engaging with the engaging hole 5, Engagement hole 4 of cap 2
Does not matter.

(Embodiment 2) A protective cap 2 for a sprinkler head according to Embodiment 2 has a bottomed cylindrical shape as shown in FIG. 5, and is provided with two grooves 12 along a generatrix on the outer peripheral surface. The inner diameter is almost the same as the outer diameter of the trunk 1a of the sprinkler head 1, and the inner peripheral surface has
A screw groove 2c is provided so as to be a reverse screw to the screw groove 3b 'of the female screw portion 3b of the falling pipe 3 to which the sprinkler head 1 is attached. In addition, a projection 6 is provided on the outer bottom surface of the protective cap 2 to mark a hole in the ceiling when the ceiling cap is buried in the ceiling. On the other hand, the sprinkler head 1 is provided with a thread 1c that engages with a thread groove 2c provided in the protective cap 2, and is provided on the female thread portion 3b of the falling pipe 3 at the upper part of the sprinkler head 1. In order to screw the male screw part 1b
At the upper end of the body portion 1a of the sprinkler head 1, a flange 1d with which a removal jig 7 described later is engaged is provided. The outer diameters of the cross section of the flange 1d and the protective cap 2 taken along a plane perpendicular to the axis of the protective cap 2 are substantially the same.

As shown in FIG. 6, the detaching jig 7 according to the present embodiment has a cylindrical shape with a bottom and an inner peripheral surface having a shape to be engaged with the outer peripheral surface of the protective cap 2. Part 13
It has. And the depth d is equal to the protection cap 2
Height h and the thickness t of the flange 1d of the sprinkler head 1 are set to be slightly deeper. The tubular portion 13 is installed at the tip of the long handle 10, and a handle 11 is provided at the lower end of the handle 10.

With the above configuration, the sprinkler head 1, the protective cap 2, and the removal jig 7 have the following features. First, when the sprinkler head 1 is screwed into the falling pipe 3, the removal jig 7 can be used. That is, the protective cap 2 is engaged with the inner surface of the cylindrical portion 13 of the removal jig 7 while being fitted to the sprinkler head 1. Here, the outer diameter of the flange 1d and the protective cap 2 are substantially the same, and the cylindrical portion 13 Is the height h of the protective cap 2 and the thickness t of the flange 1d of the sprinkler head 1.
Is set so as to be slightly deeper than the sum of the above, so that the cylindrical portion 13 is engaged up to the flange 1d of the sprinkler head 1. Therefore, in this state, the tip of the male screw portion 1b provided on the top of the sprinkler head 1 is
Abutting against the open end of the female screw portion 3b of the falling pipe 3,
By turning the handle 11 of the removal jig 7, the sprinkler head 1 can be screwed to the falling pipe 3. Also, when removing the sprinkler head 1 for inspection, replacement, etc., the removal jig 7 may be used similarly.

Next, the protective cap 2 is removed by the removal jig 7.
Is removed from the sprinkler head 1, a plate-shaped adapter 14 as shown in FIG. 6 is used. Adapter 14
Has a shape such that the outer peripheral surface can be engaged with the inner peripheral surface of the cylindrical portion 13 of the removal jig 7, and its thickness s is greater than the depth d of the cylindrical portion 13 when added to the height h of the protective cap 2. It has a thickness that increases. That is, in a state where the adapter 14 is detached and put in the cylindrical portion 13 of the jig 7, the depth of the cylindrical portion 13 is shallower than the height of the protective cap 2.
In this state, the protective cap 2 can be removed from the sprinkler head 1 using the removal jig 7. That is, with the sprinkler head 1 fitted with the protective cap 2 attached to the falling pipe 3 and the protective cap 2 exposed from the ceiling, the adapter 14 is inserted into the cylindrical part 13 of the removal jig 7. The outer peripheral surface of the protective cap 2 is engaged with the inner surface. Then, the handle portion 11 of the removal jig 7 is rotated in a direction in which the screw groove 2c of the protective cap 2 and the screw thread 1c of the sprinkler head 1 can be unscrewed. Remove from The direction of this rotation is
Is provided with a thread groove 2c on the inner peripheral surface of the falling pipe 3 on which the sprinkler head 1 is attached, so that the thread groove 2c has a reverse thread to the thread groove 3b 'of the female thread portion 3b of the falling pipe 3.
As shown in the figure, the screwing of the sprinkler head 1 and the falling pipe 3 is not affected.

That is, as described above, the removal jig 7 can be used for both attaching and detaching the sprinkler head 1 to the falling pipe 3 and detaching the protective cap 2 from the sprinkler head 1.

In this embodiment, since the two grooves 12 are provided along the generatrix of the outer peripheral surface of the protective cap 2, the protective cap 2 and the flange 1 d are formed on a plane perpendicular to the axis of the protective cap 2. The outer diameter of the cut cross section is as shown in FIG. 7 (a), which is provided with a projection along the generatrix of the outer peripheral surface of the protective cap 2 so that the protective cap 2 and the flange 1
The outer diameter of the cross section of d may be as shown in FIG. 7B, and along the generatrix of the outer peripheral surface of the protective cap 2,
The outer diameter shape of the cross section of the protective cap 2 and the flange 1d may be made as shown in FIG. 7C by chamfering.

[0029]

[Effect of the Invention] The present invention has the above-described configuration,
It has the following effects. First, the worker can remove the protective cap of the sprinkler head without climbing on a stepladder, and can easily remove the protective cap firmly fitted to the sprinkler head by twisting it.

Further, by providing a thread groove on the inner peripheral surface of the protection cap so as to be a reverse thread to the thread groove of the falling pipe for mounting the sprinkler head, the protection cap can be screwed to the sprinkler head. Therefore, it can be fixed more firmly than the fitting fixation. Then, the protective cap can be easily removed from the sprinkler head by rotating the protective cap in a direction in which the screw can be unfastened by the removal jig. At this time. Since the screw groove of the protective cap and the screw groove of the falling pipe for attaching the sprinkler head are opposite threads, the direction of rotating the removal jig is the direction of screwing the sprinkler head to the falling pipe, and the sprinkler No inconvenience such as loose attachment of the head to the falling pipe occurs.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view illustrating a use state of a protective cap according to a first embodiment.

FIG. 2 is a perspective view illustrating a protective cap and a removal jig according to the first embodiment.

FIG. 3 is a cutaway view showing an attached state of a sprinkler head.

FIG. 4 is a diagram illustrating another application example of the first embodiment.

FIG. 5 is an exploded perspective view illustrating a use state of the protective cap according to the second embodiment.

FIG. 6 is a perspective view showing a protective cap and a removal jig according to the second embodiment.

FIG. 7 is a diagram illustrating a cross-sectional shape of a protective cap according to a second embodiment.

FIG. 8 is a perspective view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sprinkler head 1c Sprinkler head thread 1d Sprinkler head flange 2 Protective cap 2c Protective cap screw groove 3 Falling pipe 3b 'Falling pipe screw groove 4 Engagement part 5 Engagement hole 7 Removal jig 8 Nail 9 Engagement piece 12 Groove 13 Tube part 14 Adapter

Claims (5)

(57) [Scope of request for utility model registration] 1. On a chord passing through the center of a cylindrical outer bottom having a bottom,
A protection cap for a sprinkler head having a plate-shaped engagement portion having an engagement hole. 2. The sprinkler head protective cap according to claim 1, wherein a thread groove is formed on the inner peripheral surface so as to be a reverse thread to the thread groove of the falling pipe to which the sprinkler head is attached. 3. The sprinkler head protection cap removal jig according to claim 1, further comprising an engagement piece that engages with the engagement hole provided with a claw that bends toward a lower end of the engagement portion. Ingredient 4. A groove along a generatrix of an outer peripheral surface of the bottomed cylindrical shape.
A protective cap for a sprinkler head having at least one projection or chamfer, and having a thread groove on the inner peripheral surface of the inner peripheral surface so as to be a reverse thread to a thread groove of a falling pipe for mounting the sprinkler head. 5. The jig for removing a protective cap for a sprinkler head according to claim 4, wherein the bottom inner cylindrical surface has a cylindrical portion having a shape engaging with the outer peripheral surface.