JPH1061138A - Movable stairs - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide movable stair with which a wide space can be obtained since there is no obstruction after it is lifted upward, and in which adjustment for the position of attachment of the spring for decreasing the distance of raising the movable stairs overcoming the dead weight thereof as small as possible can be extremely simplified. SOLUTION: In movable stairs 4, the upper end of the stairs which connect a suitable support 3 to a floor surface 1 below the latter is rotatably supported to one end of the support 3. A gas spring 7 is rotatably supported at its one end to the support 3 below a bolt 11 as a fulcrum for the movable stairs 4, and at it's the other end to the movable stairs 4 so as to energize the movable stairs 4 to be substantially horizontal, Further, the movable stairs 4 can be held in such a condition that the lower end of the movable stairs 4 is made into contact with the floor surface 1 by the dead weight of the movable stairs 4, overcoming the energizing force of the spring 7, and accordingly, the position of the upper support point of the upper part of the spring 7 can be adjusted in a substantially horizontal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an appropriate upper staircase or support including an ascending and descending staircase provided in a shaft, and a floor surface therebelow for allowing a worker to enter and exit an underground passageway from a shaft. And a movable staircase in which the upper end of a staircase connecting the upper and lower stairs is rotatably supported on the lower end of the upper staircase or one end of a support.

[0002]

2. Description of the Related Art Conventionally, this kind of stairs is disclosed in Japanese Utility Model Laid-Open No. 5-743.
As shown in a movable staircase of No. 81, a stairway descending into a cave 50 on which cables and the like are laid is provided in a shaft 51, and this staircase includes a staircase 52 having a number of steps and a staircase 52 having a number of steps.
Has a handrail 53 on one side, separates the staircase 52 and the handrail 53, supports the upper part of the staircase 52 on a shaft or an appropriate fixed object, and It is rotatably provided to a substantially horizontal position, and two columns 54 are erected on the back side of the stairs 52 at intervals so that an operator can pass therethrough. One end is supported by each of these two columns 54, A gas spring 55 whose ends are supported on both sides of the step 52 is provided,
With these gas springs 55, the staircase 52 is configured to be able to maintain its state at least at a substantially horizontal position and an inclined position where the lower end abuts or approaches a floor such as a sinus road.

[0003] Therefore, since the handrail portion of the stairs is fixed and located on one side of the staircase portion, the operator can lift and lower the handrail portion by holding his hand. Also, when not needed, the stairs can be rotated to be raised almost horizontally above the cave, etc., and the handrail is fixed, but is parallel to the longitudinal direction of the cave, etc. The stairs and handrails do not obstruct the passage of the operator through the cave. In addition, since two pillars are erected on the back side of the stair portion, and these two pillars and gas springs supported on both sides of the back surface of the stair portion are provided, the stair portion is biased by the gas spring. It can be supported at a substantially horizontal position, and can hold its state at an inclined position where the lower end abuts or approaches a floor such as a sinus by its own weight against the force of the gas spring. The operator can easily move the device from above or from a floor such as a cave. In addition, two pillars are erected on the back side of the stairs, but since the distance between the two pillars is such that the worker can pass, the worker can pass between these two pillars. Things.

[0004]

However, in the above-mentioned conventional movable stairs, even if the stairs are raised, the handrails and columns remain in the cave, so that workers in the cave can pass. It was inconvenient because the space was small. When the stairs are lowered, the stairs are lowered against the elongating force of the gas spring, but the stairs are automatically lowered on the way due to the weight of the stairs. When the stairs are lifted against the weight of the stairs, the stairs are lifted from the middle by the force of the gas spring. However, since the stairs are lifted with a smaller force, it is necessary to adjust the position of the gas spring by each actually installed stairs in order to reduce the lifting distance against the own weight of the stairs. It is difficult and cannot be prepared once fixed.

Accordingly, the present invention has been made in view of these points, and when the movable staircase is lifted upward, nothing remains below the staircase, so that a large space can be maintained and the staircase can be maintained. An object of the present invention is to provide a movable staircase in which it is extremely easy to adjust a mounting position of a spring for minimizing a lifting distance against its own weight.

[0006]

According to the first aspect of the present invention, the upper end of an appropriate upper stair or a stair connecting the support to the floor below it is rotated to the lower end of the upper stair or one end of the support. In the movable stairs freely supported, one end is rotatably supported by the upper stairs or the support below the support point of the movable stairs, and a spring is rotatably supported at the other end by the movable stairs. The support point of the stairs and the support points at both ends of the spring form a triangle, the movable stairs are held in a substantially horizontal position by the bias of the spring, and the movable stairs are opposed to the bias of the spring. By the weight of the movable stairs, so that the lower end of the movable stairs can maintain its state at an inclined position in contact with or close to the floor surface,
The position of the upper support point of the spring is a movable staircase that can be adjusted in a substantially horizontal direction.

According to the first aspect of the present invention, when the movable stairs are used, the lower end of the movable stairs abuts or approaches the floor surface by its own weight against the force of the spring. Therefore, the worker can easily go up and down the stairs. When unnecessary, when the movable stairs are lifted against its own weight, the stairs can be immediately rotated by the force of the spring and raised almost horizontally. Nothing remains on the floor below the stairs. In addition, in order to reduce the distance that the movable stairs are lifted against their own weight, the inclination of the spring can be adjusted by moving the position of the upper support point of the spring in the horizontal direction.

According to a second aspect of the present invention, there is provided a movable step in which an upper end of a stair connecting an appropriate upper stair or a support and a floor surface thereunder is rotatably supported by a lower end of the upper stair or one end of the support. In the stairs, one end is rotatably supported by an upper receiving bracket attached to the upper stairs or the support below the support point of the movable stairs so as to be movable by a fixed width in the horizontal direction,
A spring whose other end is rotatably supported by a lower bracket attached to the movable stairs is provided, and a triangle is formed by the support points of the movable stairs and the support points at both ends of the spring. The movable stairs can be held at a substantially horizontal position, and the state can be held at an inclined position where the lower end of the movable stairs abuts or approaches the floor surface by the weight of the movable stairs against the bias of the spring. In this manner, a movable staircase was obtained in which the upper receiving bracket of the spring was pressed with the tip of a preparation bolt horizontally supported on the upper staircase or the support. Therefore, by turning the adjusting bolt, the position of the upper receiving bracket is shifted, and the upper supporting point of the spring can be moved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a front view and a side view, respectively, of a movable staircase according to the present invention. A support 3 composed of a horizontal landing supported on a side wall 2 at a predetermined interval above a floor 1 is provided. Has a handrail 3a. The upper end of the movable staircase 4 is pivotally supported at one end on both sides of the support 3, and the lower end both sides of the movable staircase 4 are in contact with the floor surface 1. The movable staircase 4 has handrails 5 on both sides, and a single guide rod 6 is provided on the back surface of the movable staircase 4. Gas springs 7 are provided on both sides of the upper part of the movable stairs 4 respectively. One end of each of the gas springs 7 is rotatably supported by the support 3 below the pivotal support of the movable stairs 4, and the other end is rotatably supported by the side surface of the movable stairs 4.

FIGS. 3 and 4 are a front view of the movable staircase 4 and a front view of the handrail 5, respectively. The movable stairs 4 are provided with a number of horizontal steps 4b between the frame members 4a on both sides, and the handrails 5 are supported by each frame member 4a. In addition, a support bracket 8 is provided at the upper end of the movable staircase 4,
A pin hole 8a is formed in the upper part of the support fitting 8. A balancer 5a and a handle 5b are provided above each of the handrails 5.

FIGS. 5 to 11 show details of the mounting structure of the gas spring 7. FIG. An overhanging plate 9 is projected from one end on both sides of the support 3, and the substrate 10 a of the upper receiving bracket 10 is superimposed on the outer surface of the overhanging plate 9. , And the other end of the bolt 11 is screwed through a pin hole 8 a of the support fitting 8 of the movable staircase 4 with a nut 12. The base 10a of the upper receiving member 10 is provided with an arc hole 13 centered on the bolt 11, and the nut 1 is passed through the arc hole 13 through a bolt 14 protruding from the overhang plate 9.
5 is screwed. Therefore, when fixing the upper receiving member 10 to the overhang plate 9, the position of the upper receiving member 10 can be adjusted by turning the upper receiving member 10 about the bolt 11.

At the other end of the substrate 10a of the upper receiving member 10, a backing plate 16 is erected. On one side of the backing plate 16, two bearing plates parallel to the substrate 10a of the upper receiving member 10 are provided. 17 and 17 are protrudingly provided. A key-shaped plate 18 is erected on the overhanging plate 9, and a prepared nut 20 is fixed to a fixing nut 19 fixed with a screw hole aligned with a hole of the key-shaped plate 18.
Is screwed through and penetrates the key plate 18 so that the end of the preparation bolt 20 can freely contact the abutment plate 16 of the upper receiving fitting 10. A nut 21 is screwed onto the preparation bolt 20.

A lower support 22 is provided on the frame 4a of the movable staircase 4. The lower bracket 22 has its substrate 22a superimposed on the frame 4a, and is fixed to two long holes 23, 23 provided in the substrate 22a through screws 24, 24, respectively. A key-shaped plate 22b is erected from one side of the substrate 22a, and two bearing plates 25, 25 parallel to the substrate 22a are protruded from one side of the key-shaped plate 22b. The gas spring 7 is composed of two gas springs arranged in parallel, and a protruding plate 7a protruding from each end of both ends.
The box frame bodies 26 are provided between 7a, respectively, and are fixed with bolts.

The box frame members 26 are placed between the two bearing plates 17 of the upper receiving member 10 and between the two bearing plates 25 of the lower receiving member 22, respectively. Each of these bearing plates 17 and 17 and the box frame 2
6 and the bearing plates 25, 25 and the box frame 26 are rotatably supported by shaft support pins 27, 27 penetrating therethrough. A guide rod 29 is provided between the two gas springs 7 and 7 in parallel with the two gas springs 7. Both ends of the guide rod 29 penetrate the two box frames 26, one end is fixed, and the other end is fixed. Protrudes outward from the box frame 26, and a stopper flange 30 is fixed to an end thereof.

The movable stairs 4 are rotatable about the bolts 11 because the bolts 11 pass through the pin holes 8a of the support fittings 8 provided at the upper ends thereof. The positions of the two bearing plates 17, 17 of the upper receiving member 10 and the bearing pins 27 passing through the box frame 26 sandwiched between these bearing plates 17 are always the bearing portions of the movable staircase 4. Located below the bolt 11, the bolt 11 and the upper and lower pivot pins 27 of the gas spring 7 form a flat triangle.

The gas spring 7 is constantly urged to extend, and the free end of the movable staircase 4 is constantly raised, but the lower end of the movable staircase 4 is in contact with the floor surface 1 by its own weight. When the movable stairs 4 are lifted from above the support 3 or from the floor 1, when the movable stairs 4 exceed a certain position from the floor 1, they rise by the force of the gas spring 7, and as shown by the dashed line in FIG. It becomes almost horizontal at the height of 3. As a result, the movable staircase 4 is located above the floor surface 1, and there is nothing below the movable staircase 4, so that workers and the like can pass smoothly. To move down the movable stairs 4, hold the handrail 5 from above the support body 3 and hold the guide rod 6 from the floor surface to lower the movable stairs 4 against the force of the gas spring 7. . Then, when descending from the floor 1 below a certain position, the movable staircase 4 descends to the floor 1 by its own weight.

In mounting the movable stairs, it is possible to adjust where the branch point between the rotation of the movable stairs 4 by its own weight and the rotation by the urging force of the gas spring 7 is taken. To do this, loosen the nut 15 of the upper bracket 10 so that the upper bracket 10 is rotatable with respect to the bolt 11,
By rotating the adjusting bolt 20, the position of the contact plate 16 is shifted in the horizontal direction. Thereby, the degree of inclination of the gas spring 7 changes, and the branch point can be adjusted. This is because the mounting position and weight differ for each movable staircase to be mounted,
It is necessary to adjust the position of the branch point. After the preparation, the nut 21 of the preparation bolt 20 is tightened to the key plate 18 to fix the preparation bolt 20, and the nut 15 is further tightened.
The position of the upper bracket 10 is fixed.

In the above-described embodiment, the movable stairs are mounted between the floor and the horizontal support such as a landing. However, the present invention is not limited to this. It may be attached in between. Further, in the above embodiment, a gas spring is used, but the present invention is not limited to this, and any suitable spring may be used. Also, an upper receiving member, a lower receiving member, and the like for rotatably supporting the spring may be appropriately provided.

[0019]

According to the first aspect of the present invention, the movable stairs have stair-like steps, so that they can safely go up and down. When not required, the stairs can be turned up to be substantially horizontal by rotating the stairs. In this state, there is nothing on the floor surface and it does not become an obstacle when a worker or the like passes through the place. Moreover, the movable stairs can be held in its horizontal position by the urging force of the spring, and the lower end can be kept in contact with or close to the floor surface by the weight of the stairs, so that the movable stairs can be raised or lowered. Does not require much power,
And it can be easily operated from above or below the stairs.

Further, when the movable stairs are mounted, it is possible to adjust where the branch point of the rotation of the movable stairs by its own weight and the rotation by the biasing force of the spring is to be taken. Can be reduced as much as possible. Therefore, the mounting position can be adjusted according to the movable stairs to be mounted, and the stairs can be easily operated with a small force.

The invention of claim 2 has the same effect as that of the invention of claim 1, except where the branch point between the rotation of the movable stairs by its own weight and the rotation by the biasing force of the spring is taken. The preparation can be performed simply by turning the preparation bolt, and the preparation operation is simpler.

[Brief description of the drawings]

FIG. 1 is a front view showing an attached state of a movable staircase according to an embodiment of the present invention.

FIG. 2 is a side view showing an attached state of the movable staircase according to the embodiment of the present invention.

FIG. 3 is a front view of a movable staircase according to the embodiment of the present invention.

FIG. 4 is a front view of a handrail of a movable staircase according to the embodiment of the present invention.

FIG. 5 is a front view of a support portion that supports the movable staircase according to the embodiment of the present invention.

FIG. 6 is a front view of a main part of a pivot support portion of the movable staircase according to the embodiment of the present invention.

FIG. 7 is a plan view of a main part of a pivot support portion of the movable staircase according to the embodiment of the present invention.

FIG. 8 is a front view showing a support member of the gas spring of the movable staircase according to the embodiment of the present invention.

FIG. 9 is a side view of an upper bracket for supporting the gas spring of the movable staircase according to the embodiment of the present invention.

FIG. 10 is a plan view of an upper bracket for supporting the gas spring of the movable staircase according to the embodiment of the present invention.

FIG. 11 is a side view of a lower bracket for supporting the gas spring of the movable staircase according to the embodiment of the present invention.

FIG. 12 is a front view showing a conventional movable staircase.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 floor surface 3 support 4 movable stairs 5 handrail 7 gas spring 8 support fitting 9 overhang plate 10 upper receiving fitting 11 bolt 13 arc hole 14 bolt 15 nut 16 backing plate 17 shaft support plate 18 key plate 19 fixing nut 20 preparation Bolt 22 Lower bracket 25 Bearing plate 26 Box form 27 Shaft support pin

Claims (2)

[Claims] 1. A movable staircase in which an upper end of an appropriate upper stair or a stair connecting a support and a floor surface therebelow is rotatably supported on a lower end of the upper stair or one end of the support.
A spring having one end rotatably supported by the upper stairs or the support below the support point of the movable stairs and the other end rotatably supported by the movable stairs is provided, and the support point of the movable stairs and both ends of the spring are provided. And the supporting point of the movable stairs is held in a substantially horizontal position by the bias of the spring, and the lower end of the movable staircase is held by its own weight against the bias of the spring. In contact with or close to the floor so that the state can be maintained, and the upper support point position of the spring,
A movable staircase characterized in that it can be adjusted in a substantially horizontal direction. 2. A movable staircase in which an upper end of an appropriate upper stair or a stair connecting a support and a floor surface therebelow is rotatably supported on a lower end of the upper stair or one end of the support.
One end is rotatably supported by an upper receiving bracket attached to the upper stairs or the support below the supporting point of the movable stairs so as to be movable by a fixed width in the horizontal direction, and the lower receiving bracket is attached at the other end to the movable stairs. A rotatably supported spring is provided, so that a triangle is formed by the support points of the movable stairs and the support points at both ends of the spring, and the movable stairs are held in a substantially horizontal position by the bias of the spring,
In addition, the movable stairs can maintain its state at an inclined position where the lower end of the movable stairs is in contact with or close to the floor surface by the weight of the movable stairs against the bias of the spring. The movable staircase, wherein the upper receiving bracket of the spring is pressed by a tip of a preparation bolt horizontally supported by the upper staircase or the support in the upper staircase or the support.