JPH0882179A - Ladder with rear guard - Google Patents

Abstract

PURPOSE: To provide a safe ladder with rear guard without obstructing the passage of persons or cars by additionally providing a movable rear guard to the upper part of the top rear guard fixed to the ladder to enable a worker to move on the ladder from the ground, and making it possible to put back the movable rear guard mentioned above during the interruption of work to completely cover an excavation section, etc., with a lining plate. CONSTITUTION: A movable rear guard 8 is provided to the upper part of a rear guard 6 fixed to the upper end of a ladder 1, and a plurality of first guide bars 9 provided to the movable rear guard 8 are inserted in a plurality of first guide loops 11 provided to the rear guard fixed to the upper end of the ladder 1. Second guide bars 10 mounted to both ends of the movable rear guard 8 are inserted in second guide loops 12 and 13 provided to a fixed member of the ladder. Interlocking pieces 14 provided to the intermediate section of the second guide bars can be interlocked with the second guide loops.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder with a rear guard fixedly arranged from the ground surface to the underground and having a plurality of rear guards mounted at intervals in the vertical direction.

[0002]

2. Description of the Related Art Conventionally, a ladder with a rear guard, which is fixedly arranged from the ground surface to the underground, and has a plurality of rear guards mounted vertically at intervals.

[0003]

By the way, in the above-mentioned conventional technique, since the upper end of the ladder is the ground surface,
When the worker moves from the ground to the ladder, he must bend his waist and take an unreasonable posture to grasp the uppermost rear guard for safety, and the movement is not easy.
Therefore, it is conceivable to fix the ladder in a state in which the ladder protrudes from the ground surface. There is too much danger that the lining plate cannot be completely laid and the traffic of people and vehicles may be dangerous.

The present invention has been made in view of the above problems, and an object thereof is to dispose a movable rear guard above the uppermost rear guard fixed to the ladder. This makes it easy to move from the ground to the ladder, and during work interruptions, the movable rear guard can be retracted to completely cover the excavated area with the lining plate, thereby obstructing the passage of people and vehicles. It seeks to provide a safe ladder with a rear guard where it is not possible.

[0005]

In order to achieve the above object, the ladder with rear guard according to the present invention is fixedly arranged from the ground surface toward the underground, and a plurality of rear guards are vertically arranged at intervals. In a ladder equipped with a rear guard, the movable rear guard is arranged above the rear guard fixed to the upper end of the ladder, and a plurality of first guide rods provided on the movable rear guard are provided. A second guide rod provided on a rear guard fixed to the upper end of the ladder and inserted through a plurality of first guide rings and attached to both ends of the movable rear guard is attached to a ladder fixing member. The locking piece that is inserted through the guide ring and is provided in the middle portion of the second guide rod is used as the second
It is characterized in that it can be locked to the guide ring.

A rear guard in which the second guide ring is provided at the upper end and the middle of the ladder and a stopper is provided at the lower end of the second guide rod, and the movable rear guard is fixed to the upper end of the ladder. The locking piece is locked to the second guide ring in the middle part when it is located right above the door, and the locking piece is at the upper end when the movable rear guard is in an upwardly extended position. It is characterized in that the stopper is engaged with the second guide ring and the stopper is substantially in contact with the lower surface of the second guide ring in the middle portion.

[0007]

[Operation] According to the above configuration, when using the ladder,
The movable rear guard, which is arranged on the upper part of the rear guard fixed to the upper end of the ladder, is moved upward while being guided by the first guide rod and the second guide rod, and the locking piece is fixed. When it is locked to the second guide ring, the movable rear guard is fixed in a state of protruding from the ground. In this state, the operator can easily put his foot on the ladder using the movable rear guard. Alternatively, when the ladder is not used, the second guide ring and the locking piece are unlocked, and the movable rear guard is pressed to a position just above the rear guard fixed to the upper end of the ladder. Because it is descended,
The movable rear guard does not protrude from the ground surface.

Further, when the second guide ring is provided at the upper end portion and the intermediate portion of the ladder and the stopper is provided at the lower end portion of the second guide rod, the position extending above the movable rear guard is increased. The movable rear guard is regulated by the stopper and securely locked to the ladder at both the upwardly extended position and the lowered position.

[0009]

Embodiments of the present invention will be described with reference to the accompanying drawings. In the figure, 1 is a ladder, and the ladder 1
Are fixed in a plurality of excavated large holes or recesses or the like, and are fixed to a plurality of base frames 3, 3... Disposed between side plates 2 disposed on side walls of the holes or the recesses. Fixed fixture 4,
4 ... Reference numeral 5 denotes a lining plate arranged on the uppermost base frame 3, which is almost at the same level as the ground. The uppermost end of the ladder 1 is fixed to a fixture 4 fixed to the uppermost base frame 3.

A plurality of rear guards 6, 6 ... Are attached to the ladder 1 at intervals in the vertical direction, and these rear guards 6, 6 ... It has vertical bars 7, 7 ... and forms a ladder with a rear guard as a whole.

Reference numeral 8 denotes a movable rear guard. The movable rear guard 8 is arranged above the rear guard 6 fixed to the upper end of the ladder. A plurality of movable rear guards 8 are provided on the outer periphery of the movable rear guard 8. The first guide rods 9, 9 ... Are fixed at intervals and the gate-shaped second guide rods 10 are fixed at both ends.

The first guide rods 9, 9, ...
The first guide rings 11, 11 ... Provided on the outer circumferences of the rear guard 6 fixed to the upper end of the ladder and the rear guard 6 of the next stage extend downward so that they can be inserted.

The second guide rod 10 is provided at the upper end and the intermediate part of the ladder and is inserted with a margin into the second guide rings 12 and 13, and is inserted into the intermediate part of the second guide rod 10. A locking piece 14 is provided, and a stopper 15 is provided at the lower end.

Numerals 16 and 16 are the movable rear guards 8
Lighting lamps are installed near both ends of the light emitting device to facilitate movement of the worker 17 during nighttime work or the like and to draw attention to surrounding people. In addition, if a light-emitting reflector is provided on the inner and outer peripheral surfaces of the movable rear guard 8 and the rear guard 6 fixed to the upper end of the ladder and on the outer peripheral surface near the upper portion of the second guide rod 10, the above-mentioned movement is avoided. Is easier and safer at the same time.

In the ladder with rear guard having the above-mentioned structure, when the ladder is not used, a movable rear guard is provided above the rear guard 6 fixed to the upper end of the ladder 1 as shown in FIG. The locking piece 1 is provided in the middle portion of the second guide rod 10 of the movable rear guard 8 where the door 8 is located.
Reference numeral 4 is engaged with a second guide ring 13 provided at an intermediate portion of the ladder 1. Therefore, the uppermost movable rear guard 8 of the ladder with rear guard does not project above the ground. Therefore, the upper surface of the hole or the recess can be completely covered by the lining plate or the like.

When using the ladder, the movable rear guard 8 located above the rear guard 6 fixed to the upper end of the ladder 1 is attached to the first guide rods 9, 9 ... When the stopper 15 provided at the lower end of the second guide rod 10 comes into contact with the lower surface of the second guide ring 13 while being guided by the second guide rod 10, the stopper 15 is engaged. Second stop with stopper 14 on top of ladder
When the movable rear guard 8 is locked to the guide ring 12, the movable rear guard 8 is fixed as shown in FIG. In this state, the worker 16 can easily move back and forth toward the ladder 1 using the movable rear guard 8 and can put his foot on it.

FIGS. 5 and 6 are views showing a state in which a locking piece 14 provided on the second guide rod 10 is locked on the second guide ring 12, and as shown in FIG. The guide ring 12 is inserted with a margin. When the movable rear guard 8 is lowered to return to the original state by releasing the locking, first, as shown by the arrow in FIG.
0 is slightly raised to release the locking of the locking piece 14 and the guide ring 12, and then the guide rod 10 is slightly moved to the right in the figure to position the locking piece 14 on the inner surface of the guide ring 12. The guide rod 10 is lowered. FIG. 7 is a view showing a state in which the guide rod 10 is passing through the guide ring 12.

[0018]

As described above, according to the present invention, when a ladder is used, the movable rear guard disposed above the rear guard fixed to the upper end of the ladder is connected to the first guide rod and the second guide rod.
When the movable rear guard projects from the ground, the movable rear guard is stably fixed by raising it to the position where it extends upward while being guided by the guide rod and locking the locking piece to the second guide ring. In this state, a worker is a safe ladder with a rear girder that can easily advance and retreat with respect to the ladder using the movable rear girder and can easily rest his / her feet.

When the ladder is not used, the second guide ring and the locking piece are unlocked and the movable rear guard is pressed to fix the movable rear guard to the upper end of the ladder. The movable rear guard is maintained so that it does not protrude from the ground surface. It is a ladder with a safe rear guard that does not obstruct the passage of people and vehicles by being able to completely cover the etc.

Further, when the second guide ring is provided at the upper end portion and the intermediate portion of the ladder and a stopper is provided at the lower end portion of the second guide rod, the position extending upward of the movable rear guard is adjusted. Since the movable rear guard is restricted by the stopper and is securely locked to the ladder in both the extended position and the lowered position, the moving and fixing operation of the movable rear guard is extremely easy and reliable. A work with a rear guard.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of a ladder with a rear guard according to the present invention.

FIG. 2 is a plan view of the ladder with a rear guard of FIG. 1;

3 is a perspective view of the ladder with the rear guard of FIG. 1. FIG.

FIG. 4 is a perspective view when the movable rear guard is lowered.

FIG. 5 is a cross-sectional view showing a locked state of a guide ring and a guide rod in a ladder with a rear guard according to the present invention.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a cross-sectional view showing a state in which the guide ring and the guide rod are unlocked in the ladder with the rear guard according to the present invention.

[Explanation of symbols]

 1 Ladder 4 Fixing Tool 5 Lining Plate 6 Rear Guard 8 Movable Rear Guard 9 First Guide Rod 10 Second Guide Rod 11 First Guide Ring 12, 13 Second Guide Ring 14 Locking Piece 15 Stopper

Claims (2)

[Claims] 1. A ladder with a rear guard fixedly arranged from the ground surface toward the underground and having a plurality of rear guards mounted at intervals in the vertical direction, the rear guard fixed to the upper end of the ladder. A movable rear guard is arranged on an upper portion, and a plurality of first guide bars provided on the movable rear guard are provided on a rear guard fixed to the upper end of the ladder.
And a second guide rod attached to both ends of the movable rear guard is inserted through a second guide ring attached to a ladder fixing member, and is provided at an intermediate portion of the second guide rod. A ladder with a rear guard, wherein a stop piece can be locked to the second guide ring. 2. A rear guard, wherein said second guide ring is provided at an upper end portion and an intermediate portion of a ladder and a stopper is provided at a lower end portion of said second guide bar, and said movable rear guard is fixed to an upper end portion of said ladder. The locking piece is locked to the second guide ring in the intermediate portion in a state where the locking piece is positioned directly above the door, and the locking piece is locked to the upper end in a state in which the movable rear guard is in a position extending upward. 2. A ladder with a rear guard according to claim 1, wherein said ladder is engaged with said second guide ring and said stopper substantially abuts on a lower surface of said second guide ring at an intermediate portion.