JPH078799Y2 - Telescopic ladder hook - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook for a telescopic ladder used for a telescopic ladder consisting of at least two stations and for holding the ladder in an extended state.

[0002]

2. Description of the Related Art Conventionally, a ladder has been used for fire fighting in a building fire, and as such a ladder, there is a retractable ladder as shown in FIGS. 5A and 5B. In the figure, reference numeral 101 is a first ladder, and the first ladder 10
Reference numeral 1 is composed of four extended main rods 102, and a horizontal rod 103 and a support rod 104 which are installed between the main rods 102. The second ladder 105 can be stored in the first ladder 101, and the interval between the main rods 106 of the second ladder 105 is only narrower than the interval between the main rods 102 of the first ladder 101.
It has the same horizontal rod 107 and branch rod 108. A hook metal 109 is used to extend the second ladder 105 housed from the inside of the first ladder 101 and hold the second ladder 105 in a long state.

As shown in FIG. 6, a hook 109 is a support claw member 1 rotatably mounted in a hook body 110.
11 and a leaf spring 11 for constantly urging the tip portion of the support claw member 111 in a direction in which it projects from the inside of the hook body 110.
2 and rotatably attached to the hook body 110, and when rotated, the tip portion of the support claw member 111 is attached to the hook body 1.
It is composed of a pushing member 112 for pushing the pushing member 10 and a compression spring 113 for biasing the pushing member 112 in the rotation direction.

When the wire 114 is pulled through the pulleys 115 and 116, the stored second ladder 105 is moved upward, and the support rod 10 located at the lower end side of the second ladder 105.
8 is engaged with the support claw member 111 of the hook metal 109. Then, the second ladder 105 is supported by the first ladder 101,
This retractable ladder is held in the stretched state.

Since it is necessary to retract the retractable ladder after using it, when the wire 114 is pulled a little again, the support rod 108 of the second ladder 105 causes the pushing member 112 to resist the urging force of the compression spring 113. And press it clockwise. If the wire 114 is returned after the support rod 108 has passed over the pushing member 112, the second ladder 105 will move downward in the future, and as shown in FIG. 7, the support rod 108 will catch on the pushing member 112 and reverse it. When the pushing member 112 is rotated in the clockwise direction, the pushing member 112 comes into contact with the tip end portion of the supporting claw member 111, and the supporting claw member 111 is pushed into the hanging metal body 110. Support claw member 1
When 11 is pushed in, the support rod 108 can pass downward, the second ladder 105 is stored in the first ladder 101,
The retractable ladder is retracted.

[0006]

However, in such a conventional metal fitting of the retractable ladder, the compression spring 11 is used to urge the pushing member 112 in the counterclockwise direction.
3 is used, once the wire 114 is pulled to contract the retractable ladder, the pushing member 112 is rotated clockwise by the support rod 108 as shown in FIG. It often happens that the end of 110 is caught. When the compression spring 113 is caught on the end of the hanging metal member 110 in this way, the pushing member 112 cannot rotate clockwise thereafter, and as a result, as shown in FIG. It becomes impossible to push the support claw member 111 into the hanging bracket main body 110 via 112. As a result, there is a problem in that the stretchable ladder in the stretched state cannot be contracted.

An object of the present invention is to provide a hanging metal fitting which can push a supporting claw member into a hanging metal fitting body by a support rod through a pushing member to contract an extendable ladder in a stretched state. To do.

[0008]

In order to achieve such an object, according to the present invention, one ladder having a plurality of support rods installed between extended main rods, and Another ladder that can be stored in one ladder and that has a support rod similar to the above,
A hanging metal fitting that is provided on the one ladder of the expandable and contractible ladder including at least two ladders and that engages with the other ladder and supports the other ladder, and is rotatably attached to the hanging metal body. A support claw member that engages with the support rod, a first spring member that biases the support claw member in the engaging direction, and a support claw member that is rotatably attached to the hanging metal body to rotate the support claw member. A pushing member for pushing into the main body of the hanging metal,
A second spring member that biases the pushing member in the rotation direction is provided, and the first spring member and the second spring member are integrally formed by a single plate spring.

[0009]

When the other ladder moves upward, the support bar pushes the pushing member against the biasing force of the leaf spring. At this time, since the leaf spring biases the pushing member, the leaf spring does not catch on the hook body. Therefore, the support rod can pass over the pushing member. When the other ladder is moved downward, the support bar pushes the supporting claw member through the pushing member, so that the other ladder is stored in the one ladder.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1A, 1B and 4 are views showing an embodiment of a metal fitting of a telescopic ladder according to the present invention.

In FIG. 1A and FIG. 1B, reference numeral 1 is a first ladder, and this first ladder 1 has four main rods 2 which are extended, a horizontal rod 3 which is laid between the main rods 2 and a supporting rod. A rubber foot 6 is attached to a leg portion 5 provided at the lower end portion of the first ladder 1, which is composed of a rod 4 and the like. Further, a handle 7 is attached to the side portion of the first ladder 1, and a pulley 12 is attached to the upper end portion.

A second ladder 8 can be accommodated in the first ladder 1, and the second ladder 8 has a main rod 9 spaced from the first ladder 1.
The same as the above-mentioned horizontal rod 10 but slightly narrower than the space between the main rods 2 of
And a support rod 11 and the like, and pulleys 13 and 14 are attached to the upper end and the lower end, respectively. Also,
The third ladder 15 can be stored in the second ladder 8, and the third ladder 15 is composed of the same main rod 16, side rod 17, support rod 18, etc., and the end of the rope 19 is at the lower end thereof. The rope 19 is wound around the pulleys 14, 13 and 12 and then extended to the lower side of the first ladder 1.

Although the second ladder 8 and the third ladder 15 are doubly accommodated in the first ladder 1, the second and third ladders 8,
The same hooks 21 are provided on the upper ends of the first ladder 1 and the second ladder 8 in order to move 15 upward and maintain the stretched state of the expandable ladder.

The hook 21 provided on the first ladder 1 is shown in FIG.
As shown in FIG. 6, a 66-nylon support claw member 23 is rotatably mounted in the substantially box-shaped hook body 22, and the support claw member 23 has an opening 22 a formed in the hook body 22. The leaf spring 24 receives the urging force of the leaf spring 24 so that the tip portion thereof projects from and is stopped by the stop portion 22b. A rounded recess 23a is formed at a tip end portion of the support claw member 23 protruding from the opening 22a so as to easily engage with the support rod 4 and support the support rod 4. A push-in member 25 made of 66 nylon, which is elongated and has an arc shape as a whole, is rotatably attached to the hanging metal member main body 22. The pushing member 25 has a shape projecting from the opening 22a. The pushing member 25 is rotatable in the opening 22a in the clockwise direction. It is biased toward the side. The leaf spring 24 is integrally molded, and is fixed to the inner wall of the hook metal body 22 with a screw 26. Therefore, unlike the conventional case, the compression spring is unnecessary, and the number of parts can be reduced.

To extend and use the retractable ladder, pull the rope 19 to move the second and third ladders 8 and 15 upward, and the support rod 18 of the third ladder 15 is the second ladder 8. Is engaged with the hook metal fittings 21 provided on the second ladder 8 and the supporting rod 1 of the second ladder 8.
1 engages with a metal fitting 21 provided on the first ladder 1. That is, as shown in FIG. 2, when the support rod 11 moves upward, the support rod 11 pushes the support claw member 23 of the hook 21 into the hook main body 22 against the urging force of the plate spring 24. It passes over the support claw member 23. When the support rod 11 passes, the supporting claw member 23 projects from the opening 22 a of the hanging metal body 22 by the urging force of the leaf spring 24. The support rod 11 engages with the recess 23a of the projecting support claw member 23, and the second ladder 8 is supported by the first ladder 1 via the hook 21. In this way, the retractable ladder is extended upward and the hook 2
By 1, the extended state is held and can be used.

After use, pull the rope 19 to
The third ladders 8 and 15 move upward. That is, as shown in FIG. 3, when the support rod 11 of the second ladder 8 moves upward, it abuts against the pushing member 25 and rotates it clockwise, and resists the biasing force of the leaf spring 24 to push this pushing member 25. The member 23 is pushed rightward from the left end of the hook 22. At this time, since the leaf spring 24 biases the pushing member 25, the leaf spring 24 is moved to the right side in FIG. 3 even if it is pushed by the support rod 11, and the leaf spring 24 is moved to the end 22c of the opening 22a. It doesn't get caught. Even if it is caught, the pushing member 25
Can be pushed rightward from the left end. Therefore, the support rod 11 can pass over the pushing member 25.

Next, when the rope 19 is returned, the support rod 11 is shown in FIG.
As shown in FIG. 5, the pushing member 25 is contacted with and rotated in the counterclockwise direction, the pushing member 25 is brought into contact with the projecting end portion of the supporting claw member 23, and the supporting claw member 23 is pushed into the hook body 22. . At this time, since the pushing member 25 and the supporting claw member 23 are made of 66 nylon having slipperiness, the pushing member 25
The support claw member 23 can be pushed in smoothly.
In this way, the second and third ladders 8 and 15 are attached to the hooks 21
The retractable ladder is retracted and stored in the first ladder 1, and the retractable ladder contracts.

[0018]

As described above, according to the present invention, since the first spring member and the second spring member are composed of one leaf spring, the pushing member is pushed by the supporting rod, and this supporting rod is It is possible to pass over the pushing member, and thus the supporting claw member can be pushed through this pushing member. Therefore, the other ladder is disengaged from the engagement of the hooks and accommodated in the one ladder, and the telescopic ladder can be contracted. Further, since it is composed of one leaf spring, the number of parts can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1A is a front view showing a telescopic ladder provided with a metal fitting for the telescopic ladder according to the present invention. FIG. 1B is a side view of the telescopic ladder.

FIG. 2 is a cross-sectional view showing an example of the hook.

FIG. 3 is a diagram showing an operation of the hook.

FIG. 4 is a view showing an operation of the hook.

FIG. 5A is a front view of a conventional retractable ladder, and FIG. 5B is a side view of a conventional retractable ladder.

FIG. 6 is a cross-sectional view showing a conventional hanging metal fitting.

FIG. 7 is a view showing an operation of a conventional hanging metal fitting.

FIG. 8 is a diagram showing an operation of a conventional hanging metal fitting.

[Explanation of symbols]

1, 8, 15 ... 1st, 2nd, 3rd ladder, 4, 11, 18
... support rod, 21 ... hanging metal fitting, 23 ... support claw member, 24 ... leaf spring, 25 ... pushing member.

Claims (1)

[Scope of utility model registration request] 1. A ladder having a plurality of support rods installed between extended main rods, and another ladder that can be stored in the one ladder and that has a support rod similar to the above. A hanging metal fitting which is provided on the one ladder of the telescopic ladder including two ladders and which engages with the other ladder to support the other ladder, and is rotatably attached to the hanging metal body. A support claw member that engages with the support rod, a first spring member that biases the support claw member in the engaging direction, and a support claw member that is rotatably attached to the hanging metal body to rotate the support claw member. A push-in member for pushing the push-in member into the hanging metal body; and a second spring member for biasing the push-in member in the rotation direction.
A metal fitting for a telescopic ladder, characterized in that the spring member and the second spring member are composed of a single leaf spring.