JPH0144866B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile ladder that moves along its length on a unidirectionally sloping gable or semi-cylindrical roof.

In recent years, gable or semi-cylindrical roofs, glass,
Many are made of aluminum or other panels. A movable ladder is required when installing panels on these roofs and cleaning them after construction.

In the past, because it was necessary to work on a ladder, ladders were formed with thick frames or the ladder frames were reinforced with trusses, which increased weight.
It was difficult to move the ladder, making it impossible to move it manually.In order to solve this problem, an electric motor was installed, which had the disadvantage of increasing the cost associated with installing the electric motor.

The present invention aims to overcome these drawbacks. Traditionally, the middle part of the ladder frame was equipped with several wheels that were always in contact with the roof to improve the stability of the ladder's movement and stability during work. Providing wheels increases the frictional resistance during movement, making it heavier, so if you reduce the number of wheels in contact with the frame when moving the ladder to reduce frictional resistance, the ladder can be moved easily, and the frame of the ladder It is rather difficult to prevent the ladder from bending even when a person steps on it, and the inventor discovered that even if the ladder frame is made of a thick pipe (for example, an aluminum pipe with an outer diameter of 10 cm), the frame will bend when a person steps on it. By installing wheels that touch the rails only at the top and bottom ends of the ladder, and providing a support member in the middle of the ladder that contacts the horizontal bones of the roof only when the frame is bent by someone climbing on it, the ladder can be improved. To provide a mobile ladder which can be easily moved and which prevents the ladder from being moved unnecessarily during work on the ladder.

Embodiments of the present invention will be described below based on the drawings.

1 and 2 show a front view and a plan view, respectively, of movable ladders 4 provided on curved and sloping roofs 2 and 3 on both sides of a semi-cylindrical roof 1. The ladder 5 moves along the rails 6 and 7 in the length direction of the roof in the directions of arrows A and B.

Since the roofs 2 and 3 are symmetrical, the following description will focus on the roof 2 side.

Figures 3-11 show details of the mobile ladder. The ladder 5 is formed by fixing a step 9 to a pair of flexible frames 8 and 8' made of pipes such as aluminum, and a cylindrical pipe 1 is attached to the upper end of the ladder 5.
0. Weld and attach the cylindrical pipe 11 to the lower end. Then, a bracket 12 is fitted to each of the cylindrical pipes 10 and 11, and is fixed and fitted with a set screw 13 or the like. The bracket 12 includes a cylindrical mating part 14, a pair of legs 15 connected to the mating part 14,
15' and reinforcing ribs 16, 16'.
5 and 15' are provided with a wheel 17 facing in the vertical direction and wheels 18 and 19 at an angular interval of 120 degrees from the wheel 17 so as to be rotatable via shafts 20, 21 and 22, respectively. Therefore, a rail 6 with a circular cross section such as a cylindrical pipe is provided on the top of the roof 2, and three wheels 1
7, 18, and 19 come into contact with the circumferential surface of the rail at an angular interval of approximately 120 degrees (see FIG. 9).

When fitting the bracket 12 to the cylindrical pipe 10 of the ladder 5, if the slope angle of the curved roof is various, the wheels 17 should be oriented vertically, and the frames 8, 8' of the ladder 5 should be attached to the ninth frame. It is only necessary to adjust the rotation in the direction of arrow c in the figure and fix it with the set screw 13 (FIG. 9).

When the ladder 5 is arranged on each slope on both sides of the cylindrical roof 1, the joints 23 of the rails 6 may be connected together by a connecting member 24 and provided on the upper part of the roof (FIGS. 8 and 9).

Moreover, a cylindrical pipe is fitted to the axis of the joint 23 to form the rail 6.

A rail 7 is provided at the bottom of the curved and sloping roof 2 (FIG. 10), and a cylindrical pipe 11 is attached to the lower end of the frames 8, 8' of the ladder 5.
The same brackets 12 that were fitted to the cylindrical pipes at the upper end of the ladder are fitted respectively. Wheels 17, 18, and 19 are in contact with the circumferential surface of the rail 7 at angular intervals of 120 degrees.

Further, the circular rail 6 is provided on the upper part of the roof, and is supported by the support part 32 of the joint 23 (FIGS. 8 and 9).
It is necessary to prevent the wheel 19 from hitting the rail 6, and it is also necessary that the wheel 17 faces the substantially vertical direction and contacts the rail 6. On the other hand, roofs have various inclination angles, and ladders are installed with different inclination angles depending on the inclinations. In this embodiment, the bracket 12 is fitted onto the cylindrical pipe 10 attached to the upper end of the frames 8, 8' of the ladder 5.
The rail 6 and bracket 12 are always arranged vertically.

In the above embodiment, a bracket 12 having three wheels 17, 18, 19 was provided at the lower end of the ladder 5, but a bracket 12 having three wheels 17, 18, 19 may be provided as shown in FIG. FIG. 12 shows the vicinity of the lower end of the ladder 5 when the lower part of the curved and sloping roof 2 is a flat surface, and the flat surface itself becomes a rail, that is, the rail is a flat surface. A bracket 30 is fitted onto the attached cylindrical pipe 11, and a wheel 31 facing in the vertical direction is attached to the bracket 30 so as to be rotatable about a shaft 32. Further, in the above embodiment, the bracket 12 provided at the upper end of the ladder 5 includes:
Only one wheel 17 facing the vertical direction is attached, but when the ladder 5 is large and heavy (for example, 150 kg or more), the wheel 17 facing the vertical direction is attached to two or several brackets 12 in series. It is also possible to provide the and frame 8, 8' of ladder 5
As shown in FIG. 12, a support member such as rubber, plastic, or
Support device 25 with blocks 35 made of metal or the like
is installed. The block 25 is integrated with the frame 34, and is fixed to the bracket 27 by a bolt 36 through an elongated hole 37 while adjusting its position up and down. A mounting plate 26 is welded to the frame 8.
The support member bracket 27 is fixed to the mounting plate 26 with bolts 29 while adjusting its position back and forth through its elongated hole 33. Therefore, the block 35 as a support member is attached to the ladder 5 by adjusting its position up and down and back and forth, and is provided in correspondence with the horizontal rib 38 constituting the roof, and there is no space between the block 35 and the horizontal bone. They are provided with a gap l between them. The block 35 is attached to the frame 8 of the ladder 5 by adjusting its movement up and down and back and forth, so even if the span of the ladder 5 is long and the frame bends due to its own weight, the block 35 is attached to the frame 8 of the ladder 5 with a gap 1 in between so as not to come into contact with the horizontal bone 38. 35 can be provided by adjusting the position, and furthermore, it can be provided by adjusting the position so that it comes into contact with the horizontal bone 38 when a person climbs on the ladder 5 and bends. In FIG. 12, the block 35 indicated by a dotted line is in contact with the horizontal bone 38 when a person climbs on the ladder 5 and bends, and the ladder 5 cannot be moved and the work on the ladder 5 is stable. You can do it. Note that 28 is a reinforcing material for the bracket 27.

Further, FIG. 13 shows another embodiment in which the supporting member is a wheel 40. ladder 5 frame 8
The support device 39 attached to the bracket 27
is attached to the mounting plate 26 welded to the frame 8 through its elongated hole 3.
A wheel 40 is attached to the frame 8 with bolts 29 while adjusting the position forward and backward through the elongated hole 37 of the frame 8. Therefore, the wheels 40 are attached to the ladder 5 while adjusting their positions up and down and back and forth. wheel 40
is provided with a gap l between it and the transverse bone 38. In FIG. 13, the wheels 40 indicated by dotted lines are bent when a person is on the ladder 5, and are in contact with the horizontal bone 38. In this state, the ladder 5 can be moved, but there is a lot of frictional resistance, making it difficult to move. .

The configuration of the mobile ladder 4 has been explained above,
Looking at its operation, the rails 6 and 7 provided at the top and bottom of the curved and sloping roof 2 are brought into contact with each other at angular intervals of 120 degrees from three sides by wheels 18, 19, and 17 attached to the bracket 12. When the ladder 5 that is being held is pushed in the direction of arrow A or B in FIG. 2, the ladder 5 moves easily. At this time, if the wheels 17 attached to the bracket 12 provided at the upper end of the ladder 5 are made to face almost vertically, the load of the ladder 5 will be applied to the wheels 17.
The wheels 18 and 19 only serve as guides, allowing the ladder 5 to be moved easily.

Then, the ladder 5 is stopped at a predetermined position on the curved and sloping roof 2, and when a person gets on it, the block 35 or wheel 40, which is a support member provided in the middle part, comes into contact with the horizontal bone, and the ladder 5 becomes stable. I can also work. When the wheels 40 are used as supporting members, it is possible to move the vehicle while a person is on it. When the work is completed and the person steps down, the supporting member blocks 35 or wheels 40 are separated from the crossbones by a gap l, and the ladder 5 is easily moved.

Furthermore, FIG. 14 shows a state in which the roof is gable-shaped and a movable ladder 4' is installed on the roof which is flat and sloped on one side, and the frame of the ladder 5' is straight. It is shaped and not curved. The other configurations are exactly the same as the mobile ladder 4 described above, so a description thereof will be omitted.

The embodiments of the present invention have been described above, but the present invention has the following features: (1) Since the ladder is only provided with wheels at the upper and lower ends, when moving the ladder, there is nothing in contact with the roof other than the wheels. (2) The support member is provided in the middle of the flexible frame of the ladder corresponding to the horizontal ribs forming the roof; In addition, the support member is provided so that a gap is formed between the horizontal ribs that make up the roof and the support member, so that the ladder does not bend only when a person climbs on the ladder for work. The support member touches the horizontal bone, making the ladder stable and preventing it from moving unnecessarily during work. Also, the frame of the ladder can be made thinner than conventional ladders, and the ladder itself can be made lighter. This has the effect of making it possible.

[Brief explanation of drawings]

Each figure is a drawing related to the movable ladder of the present invention. Fig. 1 is a front view of a cylindrical roof on which a movable ladder is installed, Fig. 2 is a plan view of the same, and Fig. 3 is the same as Fig. 1. A plan view in the direction of arrows, Fig. 4 is a sectional view taken along the line - in Fig. 3,
Figure 5 is a plan view taken in the direction of the arrows in Figure 1, Figure 6 is a sectional view taken along the line - - in Figure 5, Figure 7 is an exploded perspective view of the vicinity of the top end of the ladder, and Figure 8 is a perspective view of the vicinity of the rail joint. 9 is a sectional view taken along the line - in FIG. 2, FIG. 10 is a sectional view taken along the line - in FIG. 2, and FIG. 11 is a sectional view of another embodiment corresponding to the - line sectional view in FIG. Figure 12 is a sectional view taken along line XII-XII of Figure 2,
The figure is a cross-sectional view of another embodiment corresponding to the cross section taken along the line XII--XII in Figure 2, and Figure 14 is a front view of a roof in which a movable ladder is installed on the gable roof. 1... Semi-cylindrical roof, 2, 3... Curved and sloping roof, 4... Moving ladder, 5... Ladder, 6, 7... Rail, 8, 8'... Frame, 9... Step ladder, 10, 1
1... Cylindrical pipe, 25, 39... Support device, 27...
Bracket for support member, 33, 37...long hole, {3
5...Block, 40...Wheel}...Supporting member.

Claims (1)

[Claims] 1. Brackets to which wheels are attached are provided at the upper and lower ends of a ladder with a plurality of rungs fixed to a pair of flexible frames, and brackets are provided at the upper and lower sides of a sloping roof, respectively. In the mobile ladder that moves along the rails via the wheels, the support member is provided in the middle part of the flexible frame of the ladder to correspond to the transverse frame constituting the roof; A movable ladder, characterized in that it is provided so that a gap is formed between the horizontal ribs constituting the roof and the support member. 2. The movable ladder according to claim 1, wherein the supporting member is a block made of rubber or the like. 3. The movable ladder according to claim 1 or 2, wherein the support member is provided in the intermediate portion of the ladder so as to be able to adjust its position up and down and back and forth via a support member bracket.