JP2873992B2 - Loading ladder lifting device for fire trucks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for a loading ladder in a fire truck (fire pump vehicle).

[0002]

2. Description of the Related Art Conventionally, a ladder loaded on a fire truck is hooked on a hook-shaped mounting bracket provided at a side high position (uppermost portion) of a fire truck body, or is easily removed with a bracket on the upper surface of the body. It is stopped and stored. The reason that the ladder is not stored in the lower part of the body of the fire engine in this way is because of the relationship with other equipment.

[0003]

However, the storage position where the above-mentioned ladder is mounted is a height at which the firefighter needs to stretch out on the spot and remove it in an unreasonable posture. For this reason, there is a problem that the removal of the ladder is troublesome and it takes time and effort to hurry. For this reason, the development of a lifting device for a fire truck loading ladder that allows one firefighter to easily remove the ladder is desired, but due to the specialty of a fire truck that it must be equipped with a wide variety of equipment. There is a limit on the occupied space where the ladder lifting device is provided.

An object of the present invention is to provide a fire truck loading ladder elevating device which can be easily removed by a single firefighter and occupies a small space.

[0005]

In order to achieve the above object, a lifting apparatus for a fire truck loading ladder according to the present invention comprises a fire engine body.
A rotating shaft is arranged on the side of the fire truck in the front-rear direction of the fire engine,
A rotary actuator fixed to the body is connected to the shaft.
Rotating arm that rotates in a plane perpendicular to the side of the body
The arm is composed of first and second pivot arms, and both pivot arms
The pivot point on the base end side of the
The first or second rotation by setting the
The base end of the moving arm is fixed to the rotation shaft, and the first and second
Move the rotation fulcrum on the free end side of the rotation arm to the storage position.
Install the ladder mounting table at a position shifted in the width direction of the fire engine body.
And place the ladder mounting table above the fire engine body.
The ladder table when moving up and down between the
Between the pivot points of the first pivot arm so as to rotate about 90 degrees
The distance between the fulcrum and the second fulcrum is different.
It is .

[0006]

According to the lifting and lowering device of the fire truck loaded ladder of the present invention,
Side fulcrum is set up and down on the side of the body,
1st and 2nd where the pivot point on the free end side is set on the ladder table
The second rotating arm and the ladder mounting table constitute a link mechanism.
The base end of the first or second rotating arm is fixed to the rotating shaft.
To rotate the rotating shaft by driving the rotary actuator.
Upon movement, the first and second pivot arms pivot. So
Then, the distance between the rotation fulcrum of the first rotation arm and the second rotation
Because with different rotation fulcrum intervals over arm, pivots shaft times
Angle of the first and second pivot arms when the
Are different. Therefore, the interval between the pivot points of the two pivot arms is reduced.
When set appropriately, the ladder mounting table is
Between the storage position at the top of the fire engine body and the access position at the bottom
When the ladder is moved up and down, the ladder mounting table rotates about 90 degrees .

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In one embodiment of FIGS . 1 to 3, FIG.
FIG. 3 is a side view showing a state in which the ladder 3 is raised to a high place on the side of the body 2. FIG. 2 shows the body 2 of the fire truck 1
FIG. 3 is a side view showing a state in which the ladder 3 is stored in a storage position at a side high place (uppermost part) of the body 2.

[0008] The lifting device 4 for raising and lowering the ladder 3 includes a fire engine 1
A rotating shaft 5 is disposed on the side of the body 2 in the front-rear direction of the fire engine 1, and both sides of the rotating shaft 5 are rotatably supported by bearings of an arm mounting member 6. The base end of the first rotating arm 7 is fixed (fixed) to both ends.
An L-shaped ladder mounting table 8 having a first support portion 8a and a second support portion 8b which are orthogonal to each other is mounted on the tip end (free end side) of It is pivotally connected in the vicinity of the intersection with the support portion 8b.

Further, the arm attachment member 6, the proximal end of the second pivot arm 10 is rotatably supported by a shaft 11 to the distal end of the second pivot arm 10 (free end side),
A ladder mounting table 8 is pivotally connected by a shaft 12. This second
The position at which the base end of the rotating arm 10 is pivotally mounted is a position spaced above the base end of the first rotating arm 7, and the tip of the second rotating arm 10 is The position at which the ladder 8 is attached to the ladder 8 is a position shifted inward in the width direction of the fire engine body of the ladder mounting table 8 at the ladder storage position. The second rotating arm 10 is bent in an L shape in order to avoid interference with the body 2, and the length between the base end and each of the shaft attachment portions is the first length. The length is set shorter than the length between the shaft attachment portions of the rotating arm 7.

[0010] The first rotating arm 7 and the second rotating arm 10 pivots at each rotating shaft 5, in a plane perpendicular to the body side surface about the axis 11. That is, the ladder mounting table 8 is stored in the uppermost position of the fire engine body by the link mechanism including the first and second rotating arms 7 and 10 having different rotation lengths, the ladder mounting table 8, and the arm mounting member 6. It moves between the position (solid line position in FIG. 3) and the entry / exit position (the position indicated by the two-dot chain line in FIG. 3) at the bottom of the fire engine body. Reference numeral 13 denotes a support pedestal provided at the storage position of the fire truck.

In this case, the turning shafts 5 and 11 of the turning arms 7 and 10 which are the turning fulcrums of the links are respectively located at positions vertically separated on the side of the fire engine body. Shafts 9 and 12 serving as pivot points on the bottom surface
Is shifted in the width direction of the fire engine body, and when the ladder mounting table 8 is moved between the storage position at the top of the body and the access position at the bottom, the ladder mounting table 8 rotates about 90 degrees. As shown by the solid line in FIG. 3, the first support portion 8a is located substantially vertically from the L-shaped state (storage position) in which the first support portion 8a is located substantially horizontally and the second support portion 8b is located almost vertically. Horizontal L-shape state in which the second support portion 8b is located substantially horizontally (in / out position)
The first and second pivot arms 7,
The rotation fulcrum interval and the rotation fulcrum position of each of 10 are set.

[0012] The first and second times different such that the length (length between the pivot point of the pivot point and the free end of the base end)
A link mechanism is constituted by the moving arms 7 and 10, and a ladder mounting table 8 is provided.
Of the ladder 3 by rotating the ladder 3 by approximately 90 degrees.
Can be changed to a desired height and orientation.
The operation of attaching and detaching the ladder 3 from the vehicle becomes extremely good.

Meanwhile, the as rotary driving source of the first rotating arm 7, the rotary actuator in the middle of the rotation shaft 5 of the first rotating arm 7 is fixed to the cylinder to the body 1
4 is connected to the output shaft 21 which rotates in the opposite direction. As shown in FIG. 4, the rotary actuator 14 has a piston 16 of a cylinder 15 screwed with a male screw shaft 17 coaxially penetrating the cylinder 15, and the piston 16 is provided with a rotation stopper 18. The output shaft 21 is rotated in the forward and reverse directions by the inflow and outflow of hydraulic oil from the motor 20. The output shaft 21 of the rotary actuator 14 protruding from both sides of the cylinder 15 is connected to the above-described rotation shaft 5 via a joint 22, as shown in FIG.

[0014] Thus, the piston 16 and pumping hydraulic fluid in the cylinder 15 moves linearly, thereby to rotate the output shaft 21 and the externally threaded shaft 17, the rotation shaft 5 is rotated through the joint 22, the rotary The rotation of the drive shaft 5 causes the first and second
Of the ladder mounting table 8 is moved up and down between the storage position at the top of the body and the access position at the bottom. This rotary actuator 14 does not require a large occupied space for generating high pressure and large torque.
Further, there is an advantage that the rotation angle of the first rotation arm 7 can be increased.

Although the rotary actuator 14 shown in FIG. 4 is of a type also called a screw type swing cylinder, the rotary actuator 14 in the present invention is not limited to this screw type, but may be a vane type, a rack and pinion type, or the like. . Further, the rotating arm that is rotated by the drive of the rotary actuator 14 is not limited to the first rotating arm 7 that is positioned outside in the raised state, and may instead drive the second rotating arm 10. Good.

[0016] In the one embodiment, the first and second pivot arms 7 and 10, the ladder mounting table 8, by the link mechanism consisting of the arm mounting member 6, down rotated about 90 degrees ladder table 8 configuration However, at this time, the rotation angle of the first rotating arm 7 can be different from the rotation angle of the ladder mounting table 8. For example, a shaft 12 on the ladder mounting table 8 side of the second rotating arm 10 and a shaft 11 on the arm mounting member 6 side
By determining the axis 11 on a circle having a radius equal to the distance, the rotation angle of the first rotating arm 7 can be changed.

Further, it sets the rotation fulcrum distance between both pivot arms 7 and 10 to the same length, Ryokaido arms 7,1
If the distance between the base ends of the zeros and the distance between the free ends are set to be equal to form a parallelogram link mechanism, the ladder mounting table 8 can be moved up and down without changing the attitude (direction) of the ladder mounting table 8. For example, it is suitable when the storage position is the uppermost side of the body 2 (the state of FIG. 1). In addition,
The rotary actuator 14 is mounted inside the body 2
Or attached to the outside.

[0018]

In summary, according to the present invention, the following excellent effects can be obtained. When the ladder is dropped from the storage section by rushing to the fire spot, the ladder mounting table may be lowered from the storage position at the upper portion of the fire engine body to the lower entry / exit position by rotating the rotation axis of the rotation arm. Further, since the rotary actuator is used as a drive source for rotationally driving the rotating arm, even a single fireman can easily lower the ladder. Further, since the rotary actuator occupies a small space, the space can be saved without obstructing mounting of other equipment.

Further , when the ladder mounting table is raised and lowered between the storage position at the upper part of the fire engine body and the access position at the lower part, the ladder mounting table is rotated about 90 degrees, so that the ladder mounting table can be stored at a high place. Desorption operations such as desorption in low places are extremely easy, and prompt responses can be made on site.

[0020] In addition, at the time of the ladder of attachment and detachment operation, ladders down low, so as not better out of the width of the vehicle body is less likely to become yet the failure of the fire-fighting activities. When two rotating arms are used, as compared to a single rotating arm, the height when descending the ladder is the same, and when two rotating arms are used, the width from the vehicle body is greater when two rotating arms are used. Requires less. or,
When the protruding width is the same, the ladder can be lowered to a lower position with two rotating arms.

When the ladder is lowered to the same position with one rotating arm and two rotating arms, the case where the number of the rotating arms is two is larger than the distance from the center of the shaft to the ladder. Because the distance is shorter, a heavier ladder can be raised when the same rotary actuator is used than when only one rotating arm is used.

[Brief description of the drawings]

FIG. 1 is a side view of a fire truck equipped with a ladder elevating device according to the present invention.

2 is a partial enlarged side view of one embodiment of a ladder lift device of the present invention.

FIG. 3 is a front view of the ladder elevating device of FIG. 2;

[4] Ru sectional view der of the rotary actuator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire engine 2 Body 3 Ladder 4 Lifting device 5 Rotating shaft 6 Arm mounting member 7 First rotating arm 8 Ladder mounting table 9 Axis 10 Second rotating arm 11 Axis 12 Axis 14 Rotary actuator 15 Cylinder 16 Piston 17 Male screw shaft 18 Detent 21 Output shaft 22 Joint

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) A62C 27/00 506 B60R 9/00-9/12 E06C 5/00 E06C 5/24

Claims (1)

(57) [Claims] 1. A rotary shaft is disposed on a side of a body of a fire truck in the front-rear direction of the fire truck, and a rotary actuator fixed to a body is connected to the rotary shaft, and the rotary shaft is provided in a plane orthogonal to a side surface of the body. The pivoting arm is constituted by first and second pivoting arms, and the pivoting fulcrum on the base end side of each of the pivoting arms is set at a position vertically separated from the side of the fire engine body. The base end of the first or second pivot arm is fixed to the pivot shaft, and the pivot point at the free end of the first and second pivot arms is set to the fire truck body of the ladder mounting table in the storage position. The first position is set so that the ladder mounting table rotates about 90 degrees when the ladder mounting table is moved up and down between the storage position at the upper part of the fire engine body and the access position at the lower part. If the interval between the pivot points of the pivot arm and the interval between the pivot points of the second pivot arm are different. Fire truck for loading ladder lifting equipment, characterized in that was.