JPH0866492A - Multi-type sprinkler head - Google Patents

Abstract

PURPOSE: To provide a multi-type sprinkler head which has an excellent design and has no possibility that dusts or the like enter the inside. CONSTITUTION: The sprinkler head has a protective cover 60 which is formed like a bottomed cylinder with an outside diameter nearly equal to or a little larger than the outside diameter of a frame 10, has, at the bottom, a screw part 68 to be screwed to a screw part 52 installed at the lower end of a link mechanism 40, and has a height covering the water spray hole of the frame 10 nearly up to the upper edge thereof when screwed to the link mechanism 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a frame provided with a sprinkler and incorporated as a frame and a deflector. When a fire occurs, a link mechanism incorporated in the frame is disassembled and dropped, and a fire is extinguished from the sprinkler of the frame. The present invention relates to a multi-type sprinkler head that sprays water, and more particularly to a protective cover that also serves as a heat receiving plate that protects a frame having a water spray port, a link mechanism, and the like.

[0002]

2. Description of the Related Art Generally, a multi-type sprinkler head has a main body having a threaded portion connected to a water supply pipe and having a water discharge port penetrating the center thereof, a valve body for closing the water discharge port of the main body, an arm, a fusible body. The link mechanism is made of an alloy or the like and presses the valve body against the water discharge port, and a frame, etc., in which a part of the link mechanism is housed and its arm is locked to be coupled to the main body.
As an example of such a multi-type sprinkler head,
There is an invention disclosed in Japanese Examined Patent Publication No. 52-23200.

This multi-type sprinkler head has a large-diameter base having a screw tube provided on the upper portion thereof, a valve plate and a guide plunger for closing the opening of the screw tube, and a tubular portion having an annular step portion at the center. A cylinder plate, a fuse metal, etc. are provided between a pair of locking plates and a lid plate having a plurality of fountain holes formed in the bottom, and are inserted into the cylindrical portion of the lid plate and locked to the cylindrical portion. It consists of a soluble link mechanism.

When a fire occurs, the fusible link mechanism is decomposed by the heat and falls to the outside together with the guide plunger, and at the same time, the valve plate falls due to its own weight and the pressure of the fire extinguishing water, causing the tubular portion of the lid plate to fall. Block. As a result, the screw tube is opened, and fire extinguishing water is ejected from the fountain port to extinguish the fire.

[0005]

In the multi-type sprinkler head as described above, the bottom area of the cover plate is made large and the fountains are provided there to improve the downward water distribution. The cover plate has a large diameter (usually 50 ~
Therefore, when it is installed on the ceiling, it looks bad and is annoying. Also, recently, the ceiling of the building is often a so-called system ceiling, but since the space between the T-bars of the system ceiling is narrow (about 25 mm), such a large multi-type sprinkler head is inserted from between the T-bars. The conventional multi-type sprinkler head could not be installed between the T-bars on the system ceiling.

Further, since the lower portion of the fusible link mechanism projects from the lid plate, not only does it look bad, but oil fumes generated from dust or cigarette smoke adhere to the fusible link mechanism and solidify. Since such dust and oil smoke have a heat insulating effect, there is a risk that the operation of the sprinkler head may be delayed in the event of a fire and the disassembly of the fusible link mechanism may be hindered, resulting in an unexpected situation. Furthermore, if a rod or the like is inserted into the fusible link mechanism exposed from the fountain port or the cover plate by mischief, it may hinder the operation in the event of a fire.

In order to solve such problems, for example, Japanese Utility Model Publication No. 57-4989 discloses a deflector which has a large number of water spray holes at the bottom and an opening at the center and is connected to the main body. A dustproof cover with a plurality of clips attached to the dual-purpose cover by low-temperature solder was fitted and locked with the clips to cover the surface of the deflector / cover and expose the tip of the disassembled part from the opening. A multi-type sprinkler head is disclosed.

The above-mentioned multi-type sprinkler head can prevent dust and the like from entering the inside of the deflector / cover to some extent, but it is troublesome to manufacture because a plurality of clips must be soldered to the inner surface of the dust-proof cover. Also, since the dustproof cover is simply attached to the deflector / cover by a clip, there is a risk that the dustproof cover may fall out during long-term use. Moreover, the outer diameter becomes larger than before, and the unsightly appearance when installed on the ceiling remains unsolved.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to obtain a multi-type sprinkler head which is excellent in design and has no possibility that dust or the like will enter the inside thereof. It is a thing.

[0010]

[Means for Solving the Problems]

(1) The multi-type sprinkler head according to the present invention is
A main body having a threaded portion connected to a water supply pipe and having a water discharge port penetrating through the central portion, a valve body for opening and closing the water discharge port, a cylinder or the like arranged between opposed arms to press the valve body. In a multi-type sprinkler head that includes a link mechanism, a frame that has a water sprinkling port and that accommodates the link mechanism, and is connected to the main body, and a protective cover that also functions as a heat receiving plate that is attached to the lower end of the link mechanism. It has a bottomed cylindrical shape with an outer diameter that is approximately equal to or slightly larger than the outer diameter, and has a threaded portion at the bottom that engages with the threaded portion provided at the lower end of the link mechanism. The frame has a protective cover with a height that covers almost the upper edge of the water spout.

(2) Further, in the multi-type sprinkler head of the above (1), a protective cover having a through hole having at least one notch on the outer periphery in a recess provided in the bottom, a head, a protective cover Equipped with a caulking part that is inserted into the through hole and a lock nut that has a female screw but has a smaller diameter than the caulking part.The caulking part of this lock nut is inserted into the through hole of the protective cover and The protective cover and the lock nut are integrally connected by biting a part thereof into the notch.

(3) Further, in the multi-type sprinkler head of (1) above, the large-diameter portion and the small-diameter portion formed through the stepped portion are formed into a cylindrical shape with a bottom, and the inner wall is stepped from above the stepped portion. A frame is provided in which a flange portion is provided so as to extend downward, a plurality of water spray ports are provided below the flange portion, and an opening portion is provided at a bottom portion.

[0013]

[Action]

(1) Insert the opening of the protective cover into the link mechanism and the frame, and screw the lock nut into the screw provided at the lower end of the link mechanism. At this time, the upper end of the protective cover is substantially flush with the upper edge of the water spout, and a gap is formed between the upper end and the step of the frame.
As a result, it becomes difficult for dust and the like to enter through the water spouting port and the like, and since no rod or the like is inserted into the link mechanism, it is possible to always operate normally during a fire.

(2) The caulking portion of the lock nut is inserted into the through hole of the protective cover and caulking, so that the both are integrally coupled. At this time, part of the caulked part bites into the notch provided on the outer periphery of the through hole to prevent rotation,
The protective cover does not run idle when the protective cover is attached or detached.

(3) The frame is composed of a large-diameter portion and a small-diameter portion, a step portion is provided therebetween, and a protective cover is inserted into the small-diameter portion to form a gap between the upper end portion and the step portion. Therefore, even if the protective cover is attached, the outer diameter does not increase, and even if a fire occurs and the fusible alloy melts, and the protective cover rises together with the arm support plate, the upper end of the protective cover rises. The link mechanism can be reliably disassembled without the risk of hitting a part.

[0016]

【Example】

Embodiment 1 FIG. 1 is a longitudinal sectional view of a first embodiment of the present invention, FIG. 2 is a bottom view showing a state in which a protective cover is removed, FIG. 3 is an outside view of FIG. 1, and FIG. 4 is a bottom view of FIG. 5 is an exploded perspective view of FIG.

In the figure, reference numeral 1 denotes a main body, a first screw portion 2 provided with a screw on the outer periphery, a hexagonal collar portion 3 integrally provided on the lower end portion thereof, and a screw on the outer periphery. And a second screw portion 4 integrally formed with the collar portion 3, and the first screw portion 2 and the collar portion 3 are formed in the center portion.
And the water discharge port 5 is provided so as to penetrate the second screw portion 4. The lower portion of the water discharge port 5 is enlarged in diameter to form a recess 6 for accommodating a valve body described later.
A valve seat 7 is provided between and. The flange 3 is not limited to the hexagonal shape, but may be formed in a circular shape, for example, and may be provided with a locking portion for locking the tightening tool.

As shown in FIG. 6, reference numeral 10 denotes a frame, which is formed in a bottomed cylindrical shape by a large-diameter portion 11 and a small-diameter portion 12 formed thereunder with a step portion 13 interposed therebetween. 11
Has a slightly larger outer diameter than the first threaded portion 2 of the body 1, and the outer diameter of the small diameter portion 12 is substantially equal to the first threaded portion 2 (for example, 2
2 to 23 mm). Further, a female screw 14 that is screwed into the second screw portion 4 of the main body 1 is provided on the upper portion of the inner wall, and a flange portion 15 is provided so as to project from slightly above the step portion 13 to below the step portion 13. 16 is h from the step 13
Only at the lower side, a plurality of water spouts formed radially and at substantially equal intervals between the lower surface of the flange portion 15 and the bottom portion 17 penetrate the inner and outer walls and open to the outer wall and the bottom portion 17. 1
Reference numeral 8 denotes a substantially oval opening provided on the bottom 17 and having both ends on the major axis side formed in an arc shape.

Reference numeral 20 denotes a valve body which opens and closes the water discharge port 5 of the main body 1. The valve body has a diameter smaller than that of the water discharge port 5 and is inserted into the water discharge port 5, and a flange having a diameter larger than the valve body and accommodated in the recess 6. Portion and a protrusion 2 that is provided at the center of the lower surface of the flange portion.
1 and a caulking piece concentrically provided on the outer periphery of the protrusion 21. A packing 22 is made of a metal material such as copper and covers the upper portion of the valve body 20.

Reference numeral 30 denotes an arm guide, which is formed in a substantially U-shape by a substantially rectangular substrate and plate-shaped guide pieces 32a and 32b whose both long side edges are bent downward. Both side edges of the pieces 32a and 32b are bent toward the substrate side, and at the lower end portion, in order to enhance heat transfer efficiency to a fusible alloy described later, and when a fire occurs, a cylinder etc. described later rises. Sometimes a cutout is provided to prevent the arm support plate 46 from hitting. A hole is provided in the center of the base plate, and the caulking piece of the valve body 20 is fitted into the hole and caulked to form the valve body 20 and the arm guide 30.
And are combined together.

The length L of the opening 18 provided in the bottom portion 17 of the frame 10 is longer than the diameter of the flange portion of the valve body 20, and the width W is shorter than the diameter of the flange portion of the valve body 20. ing. Further, the length of the base plate of the arm guide 30 is shorter than the length L of the opening 18 of the frame 10, and the width thereof is slightly narrower than the width W of the opening 18. Further, the length of the base plate is the valve body. The flange portion 20 has a diameter substantially equal to that of the flange portion 20 and a width smaller than that of the flange portion.

Reference numeral 35 denotes a balancer, which is a substantially rectangular substrate whose both ends on the major axis side are formed in a gentle arc shape, and both edges on the major axis side are bent downward inside the both ends of the substrate.
Between the leg portions provided at both ends of the bent portion, side walls formed in an inverted triangle shape are formed, and a fulcrum receiving concave portion is provided in the central portion of the substrate.

Reference numeral 40 is a link mechanism composed of a pair of arms 41a and 41b, an arm support plate 46, a link holding plate 55 and the like. The arms 41a and 41b are, as shown in FIG.
A head 42 bent outward in a substantially arc shape, and a head 42
It is formed wider and is formed in a substantially inverted J shape by the leg portion 43 inclined from the middle to the outside (disassembly direction of the link mechanism 40) at an angle θ ₁ (θ ₁ = 5 ° in the embodiment).
The leg portion 43 is provided with a first locking hole 44 and a second locking hole 45. The lower surface of the first locking hole 44 has an angle θ ₂ (in the embodiment, θ ₂ = 20 from the outside to the inside).
Is formed on the descending slope and the arm 41
The widths of a and 41 b are the guide pieces 32 of the arm guide 30.
The width is formed so that it can be inserted between a and 32b.

Reference numeral 46 denotes an arm support plate, which has two linear sides,
Both ends are formed in a substantially rectangular shape with two sides formed in an arc shape, and the main body has a through hole in the center, and two straight sides project from the tip and the tip is bent obliquely downward. The locking piece is locked in the first locking hole 44 of the arms 41a and 41b. Reference numeral 55 denotes a link retainer plate, which has a screw hole in the center thereof, and is composed of a rectangular main body having a width slightly narrower than the width between two linear sides of the arm support plate 46, and locking portions protruding on both sides thereof. And the locking part is arm 41
It is locked in the second locking holes 45 of a and 41b.

Reference numeral 50 denotes a cylinder, which is provided with a brim portion at a substantially central portion in the height direction of the outer wall, and has a screw portion 5 on the lower surface.
2 is projected. Then, the cylinder 50 is inserted into the through hole of the arm support plate 46 until the collar portion abuts, and is fixed at that position. Reference numeral 53 denotes a fusible alloy made of, for example, compression solder housed in the cylinder 50, and 54 denotes a first slidably housed in the cylinder 50.
The reference numeral 56 denotes a second piston in which a screw portion provided at one end is screwed into a screw hole of the link holding plate 55, and the other end abuts on the first piston 54.

Reference numeral 60 designates a protective cover which also serves as a heat receiving plate made of a metal material having a high thermal conductivity. As shown in FIG. 8, the protective cover is formed into a substantially bottomed cylindrical shape having an opening at the top and outside the opening. The diameter D ₁ is the outer diameter D of the lower end of the large diameter portion 11 of the frame 10.
And the height H is selected such that the upper end of the protective cover 60 is substantially flush with the upper end of the spout 16 when the protective cover 60 is attached to the link mechanism 40. Reference numeral 61 is a concave portion formed in the center of the bottom portion, a through hole 62 is provided in the central portion thereof, and one or a plurality of notches 63 are provided in the peripheral edge thereof.

Reference numeral 65 is a lock nut for attaching the protective cover 60 to the thread portion 52 of the link mechanism 40, and its enlarged view is shown in FIG. The lock nut 65 has a thickness substantially equal to the depth of the recess 61 of the protective cover 60, and the head 66 accommodated in the recess 61 and the through hole 62 of the protective cover 60.
And a screw portion 68 having a diameter smaller than that of the crimp portion 67 and having a female screw 69.

In the lock nut 65 as described above, the caulked portion 67 is inserted into the through hole 62 of the protective cover 60, and the head portion 66 is housed in the recess 61. In this state, the caulking portion 67 is pressed or struck from the inside of the protective cover 60 to caulk, and the lock nut 65 is integrally fixed to the protective cover 60. At this time, a part of the caulked portion 67 bites into the cutout portion 63 provided in the through hole 62 to prevent the lock nut 65 from rotating.

Next, an example of the assembling order of this embodiment, which comprises the above-mentioned respective parts, will be described. First, attach the main body 1 to the screw part 2
The valve body 20 with the packing 22 attached and the arm guide 30 fixed is inserted into the water outlet 5. Next, the balancer 35 is inserted between the guide pieces 32a and 32b of the arm guide 30, and the fulcrum receiving recess is formed in the valve body 20.
It is brought into contact with the protruding portion 21 of.

In this state, the guide piece 3 of the arm guide 30
The link mechanism 40 is inserted between 2a and 32b, and the arm 4
The heads 42 of 1a and 41b are brought into contact with the lower surface of the balancer 35. Then, the female screw 14 of the frame 10 is screwed into the second screw portion 4 of the main body 1 so as to cover the arm guide 30 and the link mechanism 40 from the outside, and both are integrally coupled.

At this time, the arm 41 of the link mechanism 40
The front end portions of the heads 42 of the a and 41b are locked to the flange portion 15 provided on the inner wall of the frame 10, and the outer surface thereof is in contact with or close to the inner peripheral surface of the frame 10. When the frame 10 is screwed in, its head 42 is pressed down by the balancer 35, resulting in the arms 41a and 41b.
Is urged in a direction to open outward with the tip of the head 42 as a fulcrum. The lower portion of the link mechanism 40 (substantially below the first locking holes of the arms 41 a and 41 b) is exposed to the outside through an opening 18 provided in the bottom 17 of the frame 10, and the guide piece of the arm guide 30. The lower ends of 32a and 32b are in sliding contact with both edges of the opening 18, and their cutouts face the cylinder 50.

Finally, by assembling the female screw 69 of the lock nut 65 fixed to the protective cover 60 into the threaded portion 52 of the cylinder 50 and fixing it, the assembly of the multi-type sprinkler head is completed. At this time, the upper end of the protective cover 60 is
It is on substantially the same plane as the upper edge portion of the water spouting port 16 provided in the frame 10, and therefore is located below the step portion 13 of the frame 10 by h. The outer shape and the lower surface shape at this time are shown in FIGS. 3 and 4. When the protective cover 60 is attached, the lock nut 65 is prevented from rotating by the caulking portion 67 that has bitten into the cutout portion 63, so that the protective cover 60 does not rotate idly and the threaded portion 5 of the cylinder 50 does not rotate.
2 can be easily screwed.

As shown in FIG. 10, the sprinkler head configured as described above is inserted through a hole 71 provided in a ceiling 70, and its threaded portion 2 is screwed into a water supply pipe 72 to be mounted on the ceiling surface. , A part of it (about half of the total length) is exposed from the ceiling surface. Reference numeral 73 is a sealing plate that closes the hole 71. Further, since the outer diameter of the frame 10 is small (about 22 to 23 mm), the frame 10 can be installed between the T bars on the system ceiling. In this case, for example, the threaded portion 2 of the main body 1 is screwed into the water supply pipe 72 connected to the universal joint, and then the water supply pipe 72 is moved to expose the lower part or the whole of the frame 10 to the room from between the T bars. The water supply pipe 72 may be fixed.

Now, in the event of a fire, the protective cover 60, which also serves as a heat receiving plate, receives heat, and a hot air stream flows from between the frame 10 and the protective cover 60 to heat the cylinder 50, and the fusible alloy 53 Melted alloy 5
3 flows out between the cylinder 50 and the first piston 54, and its volume decreases. As a result, the cylinder 50 and the arm support plate 46 fixed to the cylinder 50 ascend, and both arms 41a, 41b or at least one arm 41a is moved.
(Or 41b) pivots outward with the engagement portion with the flange portion 15 of the frame 10 serving as a fulcrum. When the arm support plate 46 rises, the protective cover 60 attached integrally with the arm support plate 46 also rises. However, since a gap h is formed between the arm support plate 46 and the step portion 13 of the frame 10, this hinders the rise. There is no such thing. As a result, the first locking hole 44 of the arm 41a, 41b or one arm 41a (or 41b),
The engagement of the arm support plate 46 with the locking piece (or one of them) is released, the balance of the link mechanism 40 is lost, and the link mechanism 40 is disassembled and disengaged from the frame 10. As a result, the link mechanism 40 including the protective cover 60 and the balancer 35 fall outside through the opening 18 provided in the bottom portion 17 of the frame 10, as shown in FIG.

At the same time, in the arm guide 30 integrated with the valve body 20, the guide pieces 32a and 32b are formed in the frame 1.
0 along the both edges of the opening 18, the flange of the valve body 20 is seated on the bottom 17 of the frame 10, and the opening 1
Block 8 As a result, the water discharge port 5 is opened, and the fire extinguishing water is sprayed from the water spray port 16 through the inside of the frame 10 as shown in FIG. At this time, part of the fire-extinguishing water hits the bottom portion 17 of the frame 10 or the valve body 20 and jumps up, hits the lower surface of the flange portion 15 and is sprayed in the immediately downward direction.

By the way, the outer diameter of the flange portion of the valve body 20 is larger than the width of the opening 18 of the frame 10 on the minor axis side as described above, but is smaller than the length on the major axis side thereof. 2, the opening 18 cannot be completely closed by the valve body 20, and as shown in FIG. 2, a gap g is formed between the flange portion of the valve body 20 and both ends of the opening 18 on the long axis side. Exists. Therefore, the fire-extinguishing water is also sprayed downward from this gap g, and in combination with the spraying from the spray port 16, the fire-extinguishing water is sprayed substantially uniformly on all four sides and below the sprinkler head.

Embodiment 2 FIG. 11 is a vertical sectional view of a second embodiment of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The first embodiment shows the case where a cylindrical frame with a bottom having a large diameter portion and a small diameter portion and a protective cover in which the outer diameter of the opening is substantially equal to the outer diameter of the lower end of the large diameter portion are used. However, in the present embodiment, the bottomed cylindrical frame 10a whose outer diameter in the vertical direction is approximately equal to the outer diameter of the threaded portion 2 of the main body 1, and the outer diameter of the opening is slightly larger than the outer diameter of the frame 10a. A bottomed cylindrical protective cover 60a is used, and the protective cover 60a is attached to the lower end portion of the link mechanism 40 so as to cover the lower portion from the upper edge portion of the water spout 16 of the frame 10a. In the frame 10a, 15 is a flange portion, 16 is a sprinkler port, and 18 is an opening portion, and the function and effect thereof are the same as in the case of the first embodiment.

The frame of the multi-type sprinkler head according to the present invention has a flange portion on the inner wall with which the arm of the link mechanism is locked, and this flange portion has a valve body on the upper portion thereof.
Since the balancer, a part of the link mechanism, etc. are provided at the minimum necessary position capable of accommodating, the projecting length of the link mechanism, etc. from the opening of the frame can be shortened.
A short, multi-shaped sprinkler head can be obtained.

Further, the lower part of the arm of the link mechanism into which the cylinder or the like is inserted is inclined outwardly to narrow the interval between the arms, and further, the flange portion is provided at the above position so that the upper end of the upper part of the arm of the link mechanism is provided. Since the outer surface of the upper end of the arm is brought into contact with or close to the inner wall of the frame, the inner diameter of the frame is set to the width of the link mechanism (distance between arms). They can be made substantially equal, and the outer diameter of the frame can be made small (22 to 23 mm in the embodiment). Further, as a result, the frame can be installed even between the narrow T-bars of the system ceiling, so that it is not necessary to provide a head mounting hole in the ceiling or hide the hole with a sealing plate.

Furthermore, since the sprinkler port and the link mechanism are always covered and protected by the protective cover, dust or the like will not enter the sprinkler port through the sprinkler port and the link mechanism or the like will not be contaminated. Not even plugged in.
Therefore, when a fire occurs, it can operate reliably. In addition, since the metal protective cover is provided at the lower end of the link mechanism including the cylinder containing the fusible alloy, when a fire occurs and the protective cover receives the heat,
Since the heat can be efficiently transferred to the fusible alloy,
The sensitivity can be improved.

The embodiment of the present invention has been described above.
The present invention is not limited to this, and the structure of the valve body, the arm guide, the balancer, the link mechanism, etc. inserted into the main body and the frame can be appropriately changed.

[0042]

As is apparent from the above description, according to the present invention, the following effects can be obtained. (1) The protective cover can be attached simply by screwing the threaded portion provided on the bottom of the protective cover into the threaded portion provided on the lower end of the link mechanism. There is no.

(2) The water spout and the link mechanism are covered and protected by a protective cover, which is aesthetically preferable. In addition, there is no risk of dust entering the inside and contaminating the link mechanism, or inserting a rod or the like into the link mechanism.
It can operate reliably in the event of a fire.

(3) Since the outer diameter of the protective cover is almost the same as the outer diameter of the frame, the appearance is elegant and preferable, and the appearance when installed on the ceiling is good.

(4) When the lock nut is caulked and fixed to the protective cover, a part of the notch is provided in the protective cover so that the lock nut has a rotation preventing function. It can be crimped to the extent that it does not exist. Therefore, when the protective cover is attached to the lower end of the link mechanism, the protective cover does not run idle and can be securely attached.

(5) Since the outer wall of the frame is formed by the large-diameter portion and the small-diameter portion via the step portion, and when the protective cover is attached, a gap is formed between the upper end portion and the step portion, Even if the fusible alloy of the link mechanism melts and the arm support plate rises together with the protective cover in the event of a fire, there is no risk that the upper end of the arm support plate will hit the step and be prevented from rising, and the link mechanism should be disassembled securely. You can In addition, a hot air stream flows in from this gap to promote melting of the fusible alloy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a first embodiment of the present invention.

FIG. 2 is a bottom view showing a state where the protective cover of FIG. 1 is removed.

FIG. 3 is an external view of the first embodiment.

FIG. 4 is a bottom view of FIG.

5 is an exploded perspective view of FIG. 1. FIG.

6A and 6B show the frame of FIG. 1, in which FIG. 6A is a front view, FIG. 6B is a bottom view, and FIG.

FIG. 7 shows an arm of the link mechanism of FIG.
(A) is a front view and (b) is a side view.

8A and 8B show the protective cover of FIG. 1, in which FIG. 8A is a plan view and FIG. 8B is a vertical sectional view.

9 is a vertical cross-sectional view of the lock nut of FIG.

FIG. 10 is an explanatory view of the operation of the first embodiment.

FIG. 11 is a vertical cross-sectional view of the second embodiment of the present invention.

[Explanation of symbols]

 1 Main body 2 Screw part 5 Water discharge port 10, 10a Frame 11 Large diameter part 12 Small diameter part 13 Step part 15 Flange part 16 Sprinkling port 18 Opening part 20 Valve body 30 Arm guide 35 Balancer 40 Link mechanism 41a, 41b Arm 46 Arm support plate 50 Cylinder 52 Screw part 60, 60a Protective cover 61 Recessed part 62 Through hole 63 Notch part 65 Lock nut 68 Screw part

Claims (3)

[Claims] 1. A main body having a threaded portion connected to a water supply pipe and having a water discharge port penetrating the center thereof, a valve body for opening and closing the water discharge port, and a cylinder or the like disposed between opposed arms. A link mechanism that presses the valve body, a frame that has a water sprinkle port and that accommodates the link mechanism, and is coupled to the main body; and a protective cover that also functions as a heat receiving plate that is attached to the lower end of the link mechanism. In the multi-type sprinkler head, a screw having a bottomed cylindrical shape with an outer diameter substantially equal to or slightly larger than the outer diameter of the frame, and screwed into a threaded portion provided at the bottom of the link mechanism at the bottom. A multi-type sprinkler head having a portion and a protective cover having a height that covers up to substantially the upper edge of the water spout of the frame when attached to the link mechanism. 2. A recess provided in the bottom portion has at least one outer periphery.
A protective cover having a through hole provided with notches, a head portion, a caulking portion inserted into the through hole of the protective cover,
And a lock nut having a female screw and having a smaller diameter than the crimped portion, the crimped portion of the lock nut is inserted into the through hole of the protective cover and caulked, and a part of the lock nut is provided in the cutout portion. The multi-type sprinkler head according to claim 1, wherein the protective cover and the lock nut are integrally coupled by being bitten. 3. A large-diameter portion and a small-diameter portion formed via a stepped portion are formed into a bottomed cylindrical shape, and a flange portion is provided so as to project from above the stepped portion of the inner wall to below the flange portion. 2. The multi-type sprinkler head according to claim 1, further comprising a frame having a plurality of water spouts provided below and an opening provided at a bottom thereof.