JPH08158574A - Folding stairs provided with angle-adjusting mechanism - Google Patents

Abstract

PURPOSE: To provide an angle-adjusting mechanism by which the angle of a folding stairs can be freely changed, in the upper connecting rod of the folding stairs, to easily change the inclination of the stairs. CONSTITUTION: An angle-adjusting mechanism 20 is installed in the bracket 7 of the upper connecting rod. The inclination of the stairs can be set at every 15 deg. by the gear teeth 23 cut on a ratchet 22 at about every 15 deg. and a claw 25. A finely adjustable screw 31 is provided as a mechanism to adjust the angle within 15 degrees. In this mechanism, the position of a transfer member 30 is shifted by the rotation of the finely adjustable screw 31 and the ratchet engaging with the transfer member 30 is also rotated to finely vary the angle. And hence, the inclination of the stairs can be freely changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a staircase, and more particularly to a folding staircase whose inclination angle can be freely selected.

[0002]

2. Description of the Related Art Generally, ladders or stepladders are used for loading articles on high shelves in buildings or truck beds. In addition, there is a folding staircase as shown in FIG. In this type of folding staircase, four tilted columns are used to pivot the treads, and the treads can move freely. It is used as a staircase to go up and down.

[0003]

However, in these folding stairs, the legs (d) of the inclined columns (a) are attached to the ground, and they are erected in a high place for use. There are some uses on steep slopes, but it is unsafe on steep slopes. It is safer to stand upright with a gentler slope than the prescribed slope when you have to lift it to a high place such as a heavy object, but it is safer, but depending on the degree of inclination,
Since the tread (b) pivotally attached to the slanted column (a) with a pin (c) is designed to move freely in a pantograph manner, the foot (d) of the stairs will slip when the tread is loaded, which is unsafe. This happens.

Therefore, the present invention fixes the slope of the folding staircase at a predetermined position so that the inclination angle of the staircase does not abruptly move, and the slope can be freely selected, and the height can be safely increased. It is to provide a folding staircase that can be lifted up and down and loaded with heavy objects.

[0005]

The present invention has been made in view of the above circumstances, and a brief description will be given below.

That is, the present invention is a folding staircase provided with an angle adjusting mechanism so that the inclination angle of the column can be fixed in accordance with the height of the column. This folding staircase has front and rear slanting columns, which are arranged in parallel with each other with a gap, pivotally attached to each other by an upper connecting rod and a lower connecting rod. It has a structure in which a tread plate arranged parallel to the rod is pivotally mounted. A mechanism that can adjust the inclination angle of the stairs is provided inside the upper connecting rod of the stairs, the slope of the stairs can be freely changed, and the angle can be fixed at the predetermined slope position. ing.

Further, a hooking metal fitting mounting bracket is provided on the upper connecting rod to facilitate the installation of the stairs and prevent the stairs from coming out of a predetermined position. Further, the folding stairs of the present invention can be used by connecting two sets of stairs and standing upright in the upper and lower layers.

[0008]

According to the folding staircase equipped with the angle adjusting mechanism of the present invention described above, the staircase is installed at a place where the staircase is installed, for example, from a lower floor to an upper floor or a high place in a limited space. When handed over, the treads pivotally attached to the front and rear tilt columns are relatively swingable and arranged parallel to each other. The angle adjusting mechanism provided inside oscillates in response to various slopes, the parallelism of the treads is maintained, and the stairs can be easily and surely bridged.

Further, according to the stairs of the present invention, it is possible to freely select and fix the gradient by the angle adjusting mechanism. Further, since the upper bracket of the stairs is provided with the hook metal fittings, the stairs can be securely and easily fixed to the upper floor or the high place side, and the lifting work to the high place can be performed safely. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0010]

1 shows a folding staircase equipped with an angle adjusting mechanism according to the present invention. The staircase comprises a pair of front slant struts 1 and a pair of rear slant struts 2, each of which has a front slant. Prop 1
And the rear slanted column 2 are connected by an upper connecting rod 3 and a lower connecting rod 4, which are formed in an L shape, and a plurality of treads 5, 5, ... Are arranged in parallel with the upper and lower connecting rods 3, 4 in between. The tread 5
The side faces of the above are pivotally attached to the front tilt column 1 and the rear part 2 by supporting shafts 6, 6 ... Therefore, the pillar and the tread can freely move in a pantograph manner.

FIG. 2 shows a state in which a folding staircase equipped with the angle adjusting mechanism of the present invention is folded. Since the staircase according to the present invention can be freely moved in a pantograph manner, when not in use. It can be folded as shown in FIG.

More specifically, the longitudinal direction of the upper connecting rod 3 formed in an L shape and the front slanted column 1, and the lateral direction and the rear slanted column 2 are respectively supported by supporting shafts 6 and 6. . Then, the lateral direction of the lower connecting rod 4 formed in an L shape in opposition to the upper connecting rod 3 and the front inclined column 1 and the longitudinal direction and the rear inclined column 2 are respectively supported by the support shafts 6 and 6. Axle. Further, the side surfaces of the treads 5, 5 ... Arranged between them are also formed in an L shape so that the longitudinal end portions and the front slanted columns 1 and the lateral direction and the rear slanted columns 2 are respectively supported by the support shafts 6, 6. I'm wearing a shaft. By doing so, when the stairs are folded, the treads 5, 5, ... Can be aligned on the same plane in the longitudinal direction of the front tilted column 1, and the stairs can be used as an ascending plate. It can also be used as a shooter when unloading luggage from a loading platform such as a truck.

Next, the angle adjusting mechanism of the present invention will be described with reference to FIGS. First, as shown in FIG. 3, the angle adjusting mechanism 20 is provided in the bracket 7 of the upper connecting rod 3, and the engaging teeth 23 and the engaging teeth 23 are provided at the end of the core 21 that is engaged in the front tilted column 1. The radiator 22 provided with the locking portion 24 is rotatably supported by the hollow pin 32. Then, the claw member 25 that engages with the radiator 22 is arranged at the U-shaped bent portion of the core 21, and is pinned by the pin 27. Further, a lever member 26 capable of releasing the engagement between the engaging tooth 23 and the claw member 25 is provided on the engaging protrusion of the claw member 25 with a pin 28.
Connect via. The pin 28 is biased by a spring 29 so that the engaging tooth 23 and the claw member 25 mesh with each other.

Further, as a device for finely adjusting the inclination angle of the stairs, a fine adjustment screw 31 provided on the bracket 7 is provided.
The locking portion 24 of the radiator 22 is combined with the moving member 30 that engages with the moving member 30, and the spring force urges the moving member 30 by the spring 33. Therefore, the fine adjustment screw 3
If 1 is turned, the locking portion 24 moves up and down together with the moving member 30 and the radiator 22 rotates. In this case, since the claw member 25 meshes with the engaging claw 23 of the radiator 22, the tilt angle of the front tilt column 1 is changed together with the claw member 25.

By the way, the spring 33 pushes the spring force up against the moving member 30 and pushes it up.
The fine adjustment screw 31 projects from the upper surface of the upper connecting rod 3. When the left and right fine adjustment screws 31 and 31 have variations, the protrusion lengths appear differently. Therefore, the fine adjustment screws 31 and 31 can be corrected by aligning the protrusion lengths (FIG. 4). reference). However, the spring 33 may not be provided in the fine adjustment screw 31. When a load is applied to the stairs, a torque that rotates the radiator 22 in the counterclockwise direction acts, and the locking portion 24 descends to move the moving member 30.
In addition, the fine adjustment screw 31 is pushed down. However, the moving member 30 is held in a predetermined position by being supported by the head of the fine adjustment screw 31, and the angle of the radiator 22 is appropriately determined.

As described above, when the angle adjusting mechanism is arranged on the stairs, first, the core 21 having the angle adjusting mechanism 20 is inserted into one end of the front tilted column 1, and the step board 5 and the upper connecting rod are connected. 3 is rotatably mounted on support shafts 6 and 6. It is preferable to dispose these angle adjusting mechanisms on both the left and right sides of the upper connecting rod 3, but if a large load is not applied, the angle of the stairs can be adjusted by disposing only one of them.

Next, a method of adjusting the angle adjusting mechanism 20,
That is, to explain the method of adjusting the gradient of the stairs, the moving member 30 that engages with the fine adjustment screw 31 is fixed at a fixed position, and the locking portion 24 that engages with the moving member 30 naturally causes the movement member 30 to be fixed. The radiator 22 is also fixed. And
Engaging teeth 23 cut at an angle of, for example, 15 degrees on the radiator 22, and a claw member 2 arranged in the front inclined support column 1.
The meshing of 5 determines the angle. That is, by shifting one of the engaging teeth 23, the gradient of the stairs can be changed by 15 degrees.

Further, for fine angle adjustment within 15 degrees, the position of the moving member 30 is changed by rotating the fine adjustment screw 31. Along with that, the radiator 22 also rotates, and the positions of the locking teeth 23 change. As a result, the position of the claw member 25 meshing with the locking tooth 23 is changed, and the inclination angle of the front inclined support column 1 is changed, so that the angle of the stairs, that is, the slope can be freely and easily adjusted. .

When the load is applied to the tread plate 3 when the staircase is moved up and down, the radiator 22 and the pawl member 25 thus engaged with each other further mesh with each other, and the teeth and the pawl do not come off. . Further, when folding the stairs as shown in FIG. 2, by pushing the lever member 26, the radiator 22
The claw member 25 is released from the engaging tooth 23 of, and the stairs can be folded at a stretch.

However, the releasing means of the claw member 25 is not limited to the lever member 26, but a screw may be provided at the position of the pin 28 and the head of the screw may be projected on the surface of the front tilted column 1. Therefore, a curved groove that allows the head of the screw to move is formed on the surface of the front inclined support column 1, and the head of the screw is slid to release the pawl member 25 from the locking tooth 23.
FIG. 5 is a specific example showing the releasing means in this case.

Next, FIG. 6 shows an embodiment in which the hook metal 9 is inserted into the bracket 7. The bracket 7 is provided with a handle 13 for fixing the hook metal.

Next, the bracket 7 and the hooking metal fitting 9 of the present invention will be described in more detail with reference to FIG. 7. (Partly refer to FIG. 3). And a fixing member 1 for fixing the hook metal 9 inside thereof.
1 is provided. Then, the hook 13 is fixed at the bent portion 12 of the fixing member 11 by the handle 13. 15
Is an engaging hole with the rear tilted column 2.

As for the hook metal 9, the hook metal 9 is put in and taken out according to the place where the stairs are bridged to a high place,
When the handle 13 is tightened after the length is determined, the bent portion 12 of the fixing member 11 presses the hook metal fitting 9 so that the hook metal fitting 9 is fixed and the stairs are displaced,
It can be prevented from falling down, and the lifting operation can be performed safely. When removing the stairs, the handle 13 is loosened and the hooking metal 9 is held down to the end face of the side bent portion 10 of the bracket 7, so that it is easy to carry because there is no catching.

Next, referring to FIG. 8, another embodiment of the hooking metal fitting 9 of the present invention will be described. The hooking metal fitting 9 is removed by the bracket 7, and the hooking metal fitting 9 is attached to the side bent portion 10 of the bracket 7. Fix with bolts and nuts through holes 15.
(At this time, the direction of the L-shaped short part of the hook can be either front or back depending on the place.) In this way, when the stairs are bridged, the position is fixed and the stairs can be prevented from coming off, which is safe. It is possible to move up and down to high places.

[0025]

As described above, the effect obtained by the folding staircase having the angle adjusting mechanism of the present invention will be briefly described as follows. (1) The angle can be adjusted in a wide range from 0 to 90 degrees, and it can be fixed at a predetermined inclination angle so that it does not slip and there is a step and a staircase is required. Such as loading and unloading work at a place or a truck bed
It is easy to use as a stair and is safe. Also,
(2) When installing stairs, the hooks can be hooked at a high place or a cargo bed, so anxiety can be eliminated and safe work can be maintained. In addition, since the hooking hardware can be stored in the bracket, the stairs can be folded and carried, the treads can be folded in parallel to form a floor, and can be used as a shooter.

As described above, in the folding staircase of the present invention, the upper connecting rod of the staircase is further bolted to the lower connecting rod, and the stairs are combined to move from the scaffold such as a construction site to the inside of the building. And where the angle of inclination of the stairs is different,
It is easy to bridge, convenient and safe. In addition, folding the stairs after use makes it easy to carry.

[Brief description of drawings]

FIG. 1 is a perspective view of a folding staircase having an angle adjusting mechanism according to the present invention.

[Fig. 2] A state in which a folding staircase is folded.

FIG. 3 is a detailed view of an upper connecting rod provided with the angle adjusting mechanism of the present invention.

4 is a sectional view taken along line AA of FIG.

FIG. 5 is another means for releasing the pawl member from the engaging teeth.

FIG. 6 is a partial detailed view of a state where a hooking metal fitting is attached to the bracket.

7 is a sectional view taken along line BB of FIG.

FIG. 8 is another example of use of the hook metal fitting.

FIG. 9 is a side view of a conventional staircase.

[Explanation of symbols]

 1 Front tilted pillar 2 Rear tilted pillar 3 Upper connecting rod 4 Lower connecting rod 5 Footing plate 6 Support shaft 7 Bracket 8 Bending portion 9 Hooking metal fitting 10 Side bending portion 11 Fixing member 12 Bending portion 13 Handle 14 Nut 15 Connection hole 16 Stopper pin 20 Angle adjustment mechanism 21 Core 22 Radius 23 Engaging tooth 24 Locking part 25 Claw member 26 Lever member 27 Pin 28 Pin 29 Spring 30 Moving member 31 Fine adjustment screw 32 Hollow pin 33 Springy tilting column Footboard Happin Two legs

Claims (3)

[Claims] 1. A plurality of tread plates are axially attached to a support shaft at predetermined intervals on a flat quadrangular link mechanism each of which includes two front tilt columns, two rear tilt columns, and an upper connecting rod and a lower connecting rod. In the folding staircase, the folding staircase is provided with an angle adjusting mechanism capable of freely adjusting the inclination angle of the staircase by adjusting the angle between the upper connecting rod and the front tilting pillar. 2. The angle adjusting mechanism according to claim 1, wherein the upper connecting rod is provided with a bracket that can be positioned according to the installation location of the stairs, and the stairs can be hung through the bracket. Folding stairs. 3. A fold provided with an angle adjusting mechanism according to claim 1, wherein the bracket is provided with a hook metal for hanging a stair, and the stair is fixed by the hook metal. Tatami stairs.