JPS6138598Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a structure for connecting a firefighting standpipe to a fire hydrant installed in the ground.

If a fire hydrant is installed in the ground, a fire stand pipe will be connected to it, and a fire hose will be attached to this stand pipe to extinguish the fire. It is essential that the section has a strong structure. However, in the past, a connecting part was connected using a clink mechanism that simply provided a protruding pawl that was biased by a push spring in the fitting opening provided at the lower end of the stand pipe, and engaged this pawl with the outer periphery of the fire hydrant. When this type of clink mechanism is used, the operation of connecting the stand pipes is simple, but the engagement between the claw body and the outer flange is maintained only by the biasing force of the push spring, which reduces the strength of the connection part. However, there was a serious problem in that if the claw body unexpectedly retreated due to strong water pressure, firefighting operations would be hindered even if the standpipe was disconnected.

This proposal was developed in view of the above problem, and the engagement state between the claw body and the outer periphery flange is held by a biasing force from a push spring and a stopper that restricts the retreat of the claw body, thereby making the connection part strong. It is an attempt to do so.

The present invention will be explained below based on embodiments shown in the drawings.

A is a fire hydrant installed in the ground, the tip of which protrudes from the bottom of a hollow hole 1 opened in the ground, and an outer flange 2 is provided at the tip.

B is a standpipe for firefighting, and the upper end is provided with a connecting port 3 for connecting to a fire hose C in a horizontal direction, and the lower end is configured to connect to a fire hydrant A.

Reference numeral 4 denotes a casing of the connection part, in which the lower end of the standpipe main body B' is formed with a large diameter, and a ring-shaped bottom plate 6 is screwed into the large-diameter outer peripheral wall 5, and the inner periphery of the ring-shaped bottom plate 6 is screwed. The inner peripheral wall 7 is erected, and the inner peripheral wall 7
A claw holding space S is formed between the outer peripheral wall 5 and the inner peripheral wall 7, and a fitting opening 8 for the fire hydrant A is provided inside the inner peripheral wall 7, and the fitting opening 8 is passed through the pipe body B' and connected to the connecting opening 3. It communicates.

Reference numerals 9, 9, and 9 are claw bodies that respectively engage with the outer peripheral collar 2 of the fire hydrant A to connect the stand pipe B to the fire hydrant A, and a claw support 10 is integrally provided at the base.
While the pawl support body 10 is held within the pawl holding space S, the pawl bodies 9 are made to face toward the center of the fitting opening 8 through notches 11 formed at three equal positions on the inner circumferential wall 7. The tip of each claw body 9 has a concave planar shape, and a pressing surface 12 with a slightly convex arc shape whose lower end is inclined outward is formed on the tip surface. Also, what is indicated by t is the retraction gap of the claw body 9.

Reference numeral 13 denotes a push spring that urges the claw body 9 to protrude into the fitting opening 8, and the plate spring is slightly curved so that both ends are supported in contact with the inner surface of the outer circumferential wall 5, and the middle portion is supported by a claw supporter. The claw body 9 is biased by the restoring force of the leaf spring that is in pressure contact with the back surface of the leaf spring 10 and tends to expand. 14 is a holding groove for the push spring 13 formed on the back surface of the claw support 10.

15, 15, 15 are cams that release the engagement state between the claw body 9 and the outer peripheral collar 2, and are formed in a trapezoidal shape, and the inclined cam surfaces 15', 15' at both ends of the cams are connected to both ends of each claw support body 10. It is made to face a retreat guide surface 10' formed in. In this case, each cam 15 is interposed between adjacent pawl supports 10, 10, so that one inclined cam surface 15' faces the retreating guide surface 10' of one pawl support 10, and the other inclined cam surface 15'' faces the retraction guide surface 10' of the other claw support 10. Note that 16 is a holding portion of the claw support 10.

17, 17, 17 are stoppers that maintain the engagement state between the claw body 9 and the outer peripheral collar 2, and are
Lower support fitting 1 slidably fitted to the lower part of B′
8, its lower end penetrates the upper wall of the casing 4, and its penetrating end is inserted into the recess interval t. Reference numeral 19 denotes an upper support metal fitting which is slidably fitted above the lower support metal fitting 18 at a distance t'.

Reference numeral 20 denotes a lifting rod for the disengagement cam 15, which passes through the lower support fitting 18 and the upper wall of the casing 4, has its upper end attached to the upper support fitting 19, and has its lower end screwed into the upper surface of the cam 15. .

Reference numeral 21 denotes an operating link of the connecting portion, the lower end of which passes through the upper support fitting 19 and is attached to the lower support fitting 18, and the upper end of which is a handle fitting 22 that is slidably fitted into the upper part of the pipe body B'. installed on.
Note that 23 is a guide fitting for the operation link 21, 24 is a fixed handle, and 25 is a coiled spring that urges the handle fitting 22 downward.

Therefore, when connecting the standpipe B to the fire hydrant A, when the handle fitting 22 is grasped against the coil spring 25 with both hands supported on the fixed handle 24, the lower support fitting 18 is connected via the operating link 21. rises, and the stopper 17 provided thereon is moved back at a distance t.
(Figure 5). In this state, connect the fitting port 8 of the stand pipe B to the fire hydrant A.
When pressed over the tip of the outer flange 2, the pressing surface 12
Since the claw bodies 9 retreat from the cutout portions 11 into the claw holding spaces S against the push springs 13 while being pressed by the above (Fig. 6), the tip of the fire hydrant A can be fitted into the fitting opening 8. become. In this fitted state, since the outer periphery flange 2 has passed the claw body 9, the claw body 9 is biased by the push spring 13.
protrudes into the fitting opening 8, and its protruding claw body 9 engages with the lower step of the outer circumferential collar 2 to connect the stand pipe B to the fire hydrant A (Fig. 7). Then, when both hands are released from the handle metal fitting 22, the lower support metal fitting 18 is pushed down by the coil spring 25 via the operation link 21, and the stopper 17 provided on the lower support metal fitting 18 moves back a distance t.
The claw body 9 intervenes inside to restrict the retreat of the claw body 9, thereby reliably maintaining the engaged state between the claw body 9 and the outer peripheral flange 2 (FIG. 8). That is, since the retraction interval t is closed by the stopper 17, the claw body 9 cannot be retracted.

Next, when removing the connected standpipe B from the fire hydrant A, squeeze the handle fitting 22 to pull out the stopper 17 that restricts the retreat of the claw body 9 from the retreat interval t, and then squeeze the handle fitting 22 again. When the upper support metal fitting 19 is lifted by the lower support metal fitting 18 and the cam 15 is raised via the elevating rod 20 provided on the upper support metal fitting 19, each pawl support body 10 is moved by the inclined cam surfaces 15', 15'. As it is pressed and its adjacent distance expands,
Each claw body 9 retreats from the notch 11 into the claw holding space S and disengages from the outer circumferential collar 2 of the fire hydrant A (Fig. 9), so the stand pipe B is moved upward in the disengaged state. Fire hydrant A
It can be removed from the

As described above, according to the present invention, the engagement state between the claw body and the outer flange can be reliably maintained by the stopper, so even if a strong water pressure is applied, the engagement will not be released unexpectedly. There is no need to worry at all, and the effect is that there is no risk of damage to the fire extinguishing operation.

[Brief explanation of drawings]

Fig. 1 is an overall side view showing a firefighting standpipe according to an embodiment of the present invention, Fig. 2 is a plan view showing the connecting part of the standpipe, Fig. 3 is a sectional view taken along the line shown in Fig. 2, and Fig. 4 is the same. - Sectional view along the line, 5th
FIG. 6, FIG. 7, FIG. 8, and FIG. 9 are explanatory diagrams each showing the operating state of the connecting portion. A: Fire hydrant, B: Fire standpipe, 2:
Outer periphery flange, 8: Fitting opening, 9: Claw body, 13: Pressing spring, 15: Disengagement release cam, 17: Engagement holding stopper.

Claims (1)

[Scope of utility model registration request] Fire standpipe B to be connected to fire hydrant A
A fitting opening 8 is provided at the lower end of the fitting opening 8, and a required number of pawls 9 disposed on the inner peripheral edge of the fitting opening 8 are configured to be biased in a protruding manner inwardly of the fitting opening 8 by a push spring 13. The body 9 is configured to be able to freely engage with the outer circumferential collar 2 of the fire hydrant A by an inward biasing force, and the claw body 9 is slid backward in the outer circumferential direction of the fitting opening 8 against the push spring 13. disengagement cam 15
is interposed between each claw body 9 so as to be able to rise and fall freely, and between each claw body 9 and the inner circumferential surface of the fitting opening 8, a fire hydrant A is provided between the claw body 9 and the fire hydrant A to restrict the retreat of the claw body 9. An engagement holding stopper 17 for locking engagement with the outer circumferential collar 2 of the standpipe B is provided so as to be able to rise and fall freely, and the stopper 17 is provided at the lower end of the operation link 21 that is vertically disposed along the outer circumference of the firefighting standpipe B. By lifting the handle fitting 22 which is connected and provided at the upper end of the connecting rod 21, the engagement holding stopper 17 is pulled up via the connecting rod 21, and the claw body 9 and the outer peripheral flange 2 of the fire hydrant A are connected to each other. Further, an upper support fitting 19 connected to the engagement release cam 15 is loosely fitted in the middle part of the operation link 21 to lock the engagement holding stopper 17. In response to a lifting operation of the operation link 21 above a certain level for the release operation, the upper support metal fitting 19 moves upward together with the operation link 21, and the engagement release cam 15
This is a joint structure of a fire stand pipe configured to move the claw body 9 backward to release the engagement between the fire hydrant A and the fire stand pipe B.