JPH0882180A - Ladder with safe frame - Google Patents

Abstract

PURPOSE: To provide a ladder with safe frames suitable for the prevention of a fall therefrom, to provide construction not interfering with work and to made it possible to fold the ladder with safe frames. CONSTITUTION: U-shaped frames 4 are provided to a ladder 1 to ensure safety, and the frames 4 are maintained in a state to project them from a support 2 to further enhance safety by providing stoppers 6 to pivots on both ends of each of the frames 4. Connection leaves 8 for connecting the frames 4 are provided, and the whole safe frame can be monolithically assembled and can be folded. Even in a double connected ladder, a lower frame 27 and an upper frame 28 having a size larger than that are provided, and an upper connection lever 34 connected with the upper frame 28 is inserted in a lower connection lever 33 with a U-shaped section connected to the lower frame 27 in a slidable manner to endure expandability as the double connected ladder as well as safety.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder provided with a safety frame for preventing a fall.

[0002]

2. Description of the Related Art Ladder can be used to climb high places,
It is also used to perform work at high altitudes, which is extremely dangerous and, in particular, doubled ladders are even more dangerous, and therefore double the risk.

[0003]

As a safety measure for preventing a fall, for example, even if a shelf or the like is provided on the ladder, not only the shelf cannot structurally expect the safety of the fall, but also the climbing and descending. During that time, you will be caught in it, making it difficult to move. Therefore, it is desirable that the safety measures be frame-shaped so as to cover the whole body if possible. However, if the frame is like a wall, it is difficult to work on the ladder because the freedom to lean on the body is restricted. In addition, it becomes necessary to consider the transportation and storage so that the entire frame can be folded.

In the case of a double ladder in which the lower ladder and the upper ladder are used by expanding and contracting, further safety measures are required because the work is carried out at a higher place, but the lower ladder and the upper ladder are Due to the peculiarities of the structure in which the are engaged, it is even more difficult to provide safety measures than a series of ladders.

It is an object of the present invention to provide a ladder with a safety frame that prevents falling and gives a climber a sense of security.

[0006]

In order to achieve the above-mentioned object, the present invention is to provide a plurality of hollow crossing rails having open both ends between a pair of right and left stanchions formed in a U-shaped cross section. In the provided ladder, a frame bone having a U-shape and having support shafts projecting at both ends facing each other is attached by rotatably and detachably inserting the support shaft into the opening of the step rail. A stopper for standing and holding the frame bone in a state of protruding from the column is attached to the support shaft of each frame bone, and the stopper is rectangular and has a short side shorter than the column width and a long side longer than the column width. It is characterized by having inclined cam surfaces on both end faces of the long side.

In addition, each frame is characterized by being connected by a connecting rod.

Further, the upper and lower ladders are slidably engaged with each other, and each of the columns of the upper and lower ladders is formed in a generally U-shaped cross section. In a double ladder provided with a plurality of cross rails, a frame bone having a U-shape and having support shafts projecting at both ends facing each other is used, and the support shafts are freely rotatable within the opening of the cross rail. It is removably inserted and attached, and the lower frame of the lower ladder is formed into a size that allows it to pass through the upper frame of the upper ladder, and the frame bone is projected from the column on the spindle of each frame bone. A stopper for standing up and holding in a state is attached.The stopper is rectangular and has a short side shorter than the strut width and a long side longer than the strut width, and inclined cam surfaces are provided on both end faces of the long side. It is characterized by having.

In addition, upper and lower connecting rods for connecting the respective frame bones with frame stoppers are provided, one connecting rod is formed in a U-shaped cross section, and the other connecting rod is slidably inserted therein, The frame stopper of the other connecting rod is configured to pass through the opening surface of the connecting rod.

[0010]

[Function] The safety frame has a structure that surrounds the body so that it can be freely climbed up and down through it, and it is also made of removable frame bones, so the frame bones can be used when necessary. Can be removed, so it does not interfere with work on the ladder. Further, since the frame bones have stoppers attached to the support shafts at both ends, during use, the frame bones can be erected and held in a state of protruding from the column.

Since the respective frame bones are connected by the connecting rods and they are constructed as an integral structure, the entire frame can be assembled and folded by rotating by holding a part of the frame bones or the connecting rods. It can be done integrally.

Even when a frame bone is provided on the double ladder, the structure is such that the lower frame bone passes through the upper frame bone, so even if both the lower ladder and the upper ladder have frame bone, Does not hinder the expansion and contraction of the upper and lower ladders. Further, since the upper and lower frame members are connected by the upper and lower connecting rods, and the upper and lower connecting rods are also configured to be expandable and contractible, they do not hinder the expansion and contraction of the upper and lower ladders like the frame bones, and therefore, the entire frame frame can be assembled and assembled. The folding can be performed integrally.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. As shown in FIG. 1, a plurality of frame bones 4 are provided at both ends of the step rail 3 at every other stage from near the lower end to the upper end of the ladder 1. These frame bones 4 are U-shaped, and are provided at both ends with support shafts 5 that project toward each other.

The cross rail 3 has a substantially cylindrical shape and is hollow.
Both mouths are open. Then, as shown in FIG. 4, the ends are fixed by being caulked. Stoppers 6 are attached to the support shafts 5 at both ends of the frame bone 4,
The frame 6 is attached to the step rail 3 by rotatably fitting the stopper 6 into the opening of the step rail 3. The stopper 6 is attached to the frame bone 4 so that the frame bone 4 is held in a substantially horizontal state. Then, in order to prevent the frame bone 4 from coming off, so as to penetrate the frame bone 4 from the stopper 6,
Through the lock pin 10. Therefore, when the frame bone 4 is rotated, the stopper 6 is also rotated together. Further, the frame bone 4 can be removed from the stopper 6 by removing the lock pin 10.

The stopper 6 is made of a synthetic resin, and a plate 11 having a thickness that can be substantially filled is formed in a pillar 2 having a U-shaped cross section in a rectangular shape as shown in FIG.
A cylindrical portion 12 that penetrates the plate body 11 in the thickness direction is provided in the central portion of the. The tubular portion 12 has a thickness that allows it to be rotatably fitted in the opening of the step rail 3, and the inner hole has a thickness that allows the frame bone 4 to be inserted therein. In addition, the short side of the rectangle is a width that can be fitted into both side walls 13 of the column 2, and the long side is the side wall 1.
It is longer than between 3 and 13. The plate body 11 has a substantially parallelogram shape by providing the inclined cam surfaces 7 at both ends of the long side.

The plate 11 may have a diamond shape. The short side of the rhombus is a width that can be fitted into both side walls 13 and 13 of the column 2, and the long side is longer than between the both side walls 13 and 13. And
The obtuse angles facing each other form a gentle curve together.

The connecting rod 8 reinforces the strength of the safety frame and connects the frame bones 4 so that they can rotate at a time.
As described above, one frame is mounted on each of the left and right sides of the frame bone 4 on the back side of the ladder 1 when going up and down. The frame bone 4 is rotatably screwed to the front surface or the back surface of the connecting rod 8 by a frame stopper 9.

In the case of the present invention (claim 3) in a double ladder, as shown in FIG. 5, a plurality of lower frame bones 27 are provided from near the lower end of the lower ladder 21 to the upper end thereof, and the upper ladder 22 A plurality of upper frame bones 28 are provided from near the lower end to the upper end. The shape of each of these frame bones 27, 28 is the same as that of the ladder 1, except that the upper frame bone 28 is the lower frame bone 27.
The lower frame bone 27 is formed to be slightly larger than the lower frame bone 27 so as to pass through. Further, the attachment of each frame bone 27, 28 to the step rail 25 is similar to that of the ladder 1, and the stoppers 31 attached to the support shafts 29, 30 at both ends of each frame bone 27, 28 are attached to the lower frame. The bones 27 are attached to the step rails 25 of the lower ladder 21 and the upper frame bones 28 are attached to the step rails 25 of the upper ladder 22 by fitting them at every other step.

The upper and lower frame bones 27 and 28 are connected to the upper and lower connecting rods 33 and 3, respectively.
It is similar to the ladder 1 in that it is connected to 4, and as shown in FIG. 5, the left and right ones are attached to the back side of the upper and lower frame bones 27 and 28 when going up and down the upper and lower ladders 21 and 22, respectively. I am doing it. Then, the lower connecting rod 33 connecting the lower frame bones 27 has a U-shaped cross section as shown in FIG. 6, and when the opening surface 38 is faced up, the lower frame bones 27 are screwed to the back surface thereof with frame fittings 35. I am doing it. Further, the upper connecting rod 34 that connects the upper frame bone 28 is slidably inserted into the lower connecting rod 33, and the upper frame bone 28 is passed through the opening face 38 of the lower connecting rod 33 on the surface thereof. The frame stopper 35 is screwed. Also, of the upper and lower connecting rods 33, 34,
The side on which the U-shaped cross section is formed and the side on which the U-shaped section is inserted may be reversed.

In the case of a double ladder, the upper frame bone 28 and the upper connecting rod 34 may be attached only to the upper ladder 22. The shape and attachment of the upper frame bone 28 and the upper connecting rod 34 at that time are the same as in the case of the ladder 1.

FIG. 1 shows a state in which the frame bones 4 of the ladder 1 are assembled, and the ladder 1 is raised and lowered through the frame bones 4. When the frame bone 4 is used, as shown in FIG. 2, the frame bone 4 folded upward is rotated downward and protruded from the column 2. When the frame bone 4 is folded, the frame bone 4 is rotated upward, as shown by the chain double-dashed line in FIG.

When the frame bone 4 is rotated, the stoppers 6 at both ends of the frame bone 4 are also rotated together. Then, when the frame bone 4 is rotated until it becomes substantially horizontal, as shown in FIG. 2, the stopper 6 brings the cam surface 7 into contact with both side walls 13 of the support column 2 and does not rotate any more. So stopper 6
The frame bone 4 which is integrally rotated with is also further prevented from rotating downward, and the standing state is maintained.

Since the respective frame bones 4 are connected by the connecting rods 8, it is possible to integrally assemble or fold the entire frame bones 4 by rotating while holding the frame bones 4 or a part of the connecting rods 8. it can.

The frame bone 4 has a lock pin 10 as shown in FIG.
It can be removed from the stopper 6 by removing. Then, the frame bone 4 removed from the stopper 6 can be rotated around the portion connected to the connecting rod 8 by the frame stoppers 9 as an axis and hooked on the connecting rod 8. This frees the sides and makes the work easier.

Assembling and folding the frame bones 27 and 28 of the double ladder are the same as in the case of the ladder 1. Then, as shown in FIG. 7, the lower frame bone 27 passes through the upper frame bone 28, and the upper and lower connecting rods 33 and 34 to which the frame bones 27 and 28 are connected are also integrally expandable. Since the upper and lower ladders 21 and 22 can be expanded and contracted without any hindrance, the frame bones 27 and 28 or the connecting rods 33 and 34 can be rotated with a part thereof to rotate the entire frame bones 27 and 28. Can be assembled and folded together.

[0026]

The safety frame has a structure suitable for preventing falling and ascending / descending, and since it is composed of a plurality of frame bones, it does not hinder the work on the ladder and each frame bone is stepped on. Since it is rotatably fitted in the open mouths at both ends of the crosspiece, the safety frame can be folded by rotating the frame bone, and it can be kept compact.

Since the stoppers are provided on the support shafts at both ends of each frame bone, the safety frame can be kept in an upright state during use, and the safety frame does not suddenly fold during the work, and is safe. Can work.

Since the entire safety frame is constructed as an integral structure by connecting the respective frame bones with the connecting rods, the entire safety frame can be folded and assembled by rotating by holding a part of the frame bones or the connecting rods. Can be done at once.

Since each frame frame is detachably attached to the stopper, it is possible to remove the frame frame when necessary and partially open the side surface of the safety frame to facilitate the work on the ladder. it can. Also, remove all frame bones during transportation,
You can remove the safety frame and carry it around.

In the double ladder, the frame bones are provided from the lower ladder to the upper ladder, and even though the frame bones are connected by the upper and lower connecting rods, if they do not hinder the expansion and contraction of the double ladder. Since the entire safety frame expands and contracts simultaneously with the expansion and contraction of the double ladder, the safety frame can be protected from falling at any height. Further, since the safety frame has an integral structure, it is possible to fold and assemble the entire safety frame at once by rotating by holding a part of the frame bone or the connecting rod.

[Brief description of drawings]

FIG. 1 is a perspective view of a ladder with a safety frame.

FIG. 2 is a side view of an upper end portion of the ladder, which is partially cut away.

FIG. 3 is a perspective view showing a partially released state of a safety frame of the ladder.

FIG. 4 is a cross-sectional view of relevant parts showing a mounting state of frame bones of a safety frame.

FIG. 5 is a perspective view showing a structure of a stopper.

FIG. 6 is a perspective view showing another example of a ladder with a safety frame.

FIG. 7 is an enlarged cross-sectional view taken along the line AA of FIG.

8 is a side view of the upper end part of the ladder of FIG. 6 with a part cut away.

[Explanation of symbols]

 1 Ladder 2 Strut 3 Step Ladder 4 Frame Bone 5 Spindle 6 Stopper 7 Cam Surface 8 Linking Rod 9 Frame Stopper 10 Lock Pin 11 Plate 12 Cylinder 13 Sidewall 21 Lower Ladder 22 Upper Ladder 23 Lower Strut 24 Upper Strut 25 Tread Crosspiece 27 Lower frame bone 28 Upper frame bone 29 Lower support shaft 30 Upper support shaft 31 Stopper 32 Cam surface 33 Lower connecting rod 34 Upper connecting rod 35 Frame stop fitting 38 Opening surface

Claims (4)

[Claims] 1. A ladder (1) provided with a plurality of hollow cross-rails (3) provided between a pair of left and right columns (2) having a U-shaped cross section. The frame-like bone (4) having the support shafts (5) protruding toward each other at both ends is rotatably and detachably inserted into the opening of the step bar (3). While attached,
A stopper (6) for standing and holding the frame bone (4) in a state of protruding from the column (2) is attached to the support shaft (5) of each frame bone (4), and the stopper (6) is a rectangle. It has a short side shorter than the width of the support column (2) and a long side longer than the width of the support column (2), and is characterized by having inclined cam surfaces (7) on both end faces of the long side. Ladder with safety frame. 2. The ladder with a safety frame according to claim 1, wherein each frame frame (4) is connected by a connecting rod (8). 3. A lower ladder (21) and an upper ladder (22) slidably engaged with each other, and the upper and lower ladders (22, 21).
Each of the columns (23, 24) is formed in a generally U-shaped cross-section, and a plurality of hollow stepped crosspieces (25) with open both ends are provided between the left and right sides of the upper and lower columns (24, 23). In a double ladder, a frame bone (27, 28) having a U-shape and supporting shafts (29, 30) protruding at both ends facing each other.
Is attached by inserting the support shafts (29, 30) into the opening of the step rail (25) so as to be rotatable and detachable, and to attach the lower frame bone (27) of the lower ladder (21) to the upper ladder ( 22)
The frame bones (27, 28) are formed on the support shafts (29, 30) of the respective frame bones (27, 28) by supporting columns (23, 24). A stopper (31) for standing upright in a more protruding state is attached,
The stopper (31) has a rectangular shape, and supports (23, 2)
4) A safety frame having a short side shorter than the width and a long side longer than the width of the columns (23, 24), and having inclined cam surfaces (32) on both end faces of the long side. With ladder. 4. A frame stopper (3) for connecting each frame bone (27, 28).
5) The upper and lower connecting rods (33, 34) connected with each other are provided, one connecting rod (33 or 34) is formed in a U-shaped cross section, and the other connecting rod (34 or 33) is slidably inserted therein. Then
Opening surface (38) of the one connecting rod (33 or 34)
In addition, the frame stopper (3) of the other connecting rod (34 or 33).
The ladder with a safety frame according to claim 3, wherein the ladder (5) is configured to pass.