JPH0572894U - Aerial work platform - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an aerial work platform with an improved balance of left-right weight and increased driving force. [Configuration] A vertically movable boom 3 is pivotally mounted on a vehicle body 2 having a traveling body 12 and capable of traveling back and forth via a pivot shaft 22, and a work cage 4 is provided at the tip of the boom 3. In the aerial work platform, a counterweight 29 movable in the left-right direction is provided on the vehicle body 2 near the drive unit 10 side of the traveling body 12, and the counterweight 29 of the boom 3 is rotated when the boom 3 turns. An actuator 32 that is displaced in the direction opposite to the turning direction is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an aerial work platform.

[0002]

[Prior Art]

 For example, as an aerial work trolley used for harvesting, chemical spraying, pruning, etc. in an orchard, a pair of front and rear wheels for running are provided on the front and rear sides of the vehicle body, and at the tip it is used as a work space and an operation box for the vehicle body etc. There is a boom that has a work cage and that can move up and down, and is pivotally attached to the upper part of the vehicle body so as to be able to turn left and right via a turning shaft that is arranged in the center of the vehicle body in the left-right direction.

In the aerial work carts used for harvesting fruit trees, etc., the running place is often inclined, so that there is a problem in preventing rollover of the vehicle body. A counterweight that rotates synchronously with the boom is integrally provided on the side opposite to the position where the cage is located, and the counterweight is used to balance the weight with the boom to prevent overturning (for example, the applicant of the present application). (See Japanese Patent Application No. 63-130746).

[0004]

[Problems to be solved by the device]

 However, in the above-described conventional technique, the counterweight is provided on the driven wheel side of the traveling body including the driven wheel and the driving wheel, which is advantageous in terms of weight balance, but is particularly advantageous in traveling on slopes. Since the counterweight was not involved in the driving force (running force), there was a problem in terms of drivability.

An object of the present invention is to make it possible to increase the driving force by the weight while rotating the boom to ensure the weight balance with the counterweight.

[0006]

[Means for Solving the Problems] In the present invention, a vertically movable boom 3 is pivotally mounted via a pivot shaft 22 on a vehicle body 2 equipped with a traveling body 12 and capable of traveling forward and backward. The following technical measures are taken in order to achieve the above-mentioned object in the aerial work carriage having the work cage 4 at the tip of the boom 3.

That is, according to the present invention, a counterweight 29 that is movable in the left and right directions is provided on the vehicle body 2 of the traveling body 12 near the drive unit 10, and the counterweight 29 is used when the boom 3 turns. The actuator 32 is characterized in that it is provided with an actuator 32 that is displaced in the direction opposite to the turning direction of 3.

[0008]

[Action]

 When the boom 3 turns around the turning axis 22, the counterweight 29 is displaced in the direction opposite to the turning direction of the boom 3 to balance the left and right weights. The counterweight 29 is located on the vehicle body 2 near the drive unit 10 side of the traveling body 12, and therefore, the weight of the counterweight 29 acts on the drive unit 10 during traveling by the traveling body 12 and whether the boom 3 turns or not. Without running power (traction force) is increased.

[0009]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the first embodiment shown in FIGS. 1 and 2, reference numeral 1 is a work platform for aerial work, which is used for harvesting work, chemical application, pruning, etc., and is vertically attached to the car body 2 and the upper part of the car body 2 and is operated to move up and down and turn. The boom 3 and the work cage 4 provided at the tip of the boom 3 are provided.

The vehicle body 2 includes a main frame 6 made of pipe material, a rear frame 7 standing on the rear end of the main frame 5, and a pair of left and right connecting the rear frame 7 and the front end of the main frame 6. It has a reinforcing rod 8. The front portion of the main frame 6 has a pair of left and right front wheels 10 supported on the outer side, and the rear portion has a pair of left and right rear wheels 11 supported as driven wheels. 11 is a wheel-shaped traveling body 12. The rear wheels 11 are caster wheels that can be freely changed in any direction.

Reference numeral 13 denotes an engine, which is mounted on the rear portion of the vehicle body 2 and is interlockingly connected to a relay shaft 15 via a belt 14. From the left and right ends of the relay shaft 15, a pair of left and right forward belts 16 and a reverse belt 17 are provided. The power is transmitted to the left and right front wheels 10 via the gear mechanism 18, the chain 19 and the like. The forward belt 16 and the reverse belt 17 are provided with a tension-type forward clutch 20 and a reverse clutch 20, respectively.By turning on and off each of these clutches 20, a pair of left and right front wheels 10 are simultaneously or independently positive. The car body 2 can be rotated or reversed to move the car body 2 forward, turn, or reverse.

Reference numeral 21 denotes a U-shaped mounting frame as viewed in the front-rear direction. A swivel shaft 22 is spline-fitted to the mounting frame 21 so as to project downward, and the swivel shaft 22 is mounted on the rear frame 7 and the main frame 6. Each is supported by a bearing. The base of the boom 3 is pivotally attached to the mounting frame 21 via a horizontal shaft 23, and a supporting bracket provided at the lower end of the rotating shaft 22 and a lower bracket provided at the lower center of the boom 3 are provided. A boom elevating cylinder 24 is interposed between the two. Then, in the lowered position of the boom 3, the work cage 4 is located near the front of the front wheel 10.

Reference numeral 25 denotes a boom turning cylinder, which can be operated by a pedal 26 provided on the work cage 4 together with the cylinder 24. Reference numeral 27 is a counterweight for front-rear weight balance, which is provided below the swing shaft 22 via an arm 28 so as to be displaced in the direction opposite to the swing direction of the boom 3.

Reference numeral 29 is a counterweight for achieving weight balance and increase in driving force. A guide rod 31 oriented in the left-right direction is provided on a frame body 30 erected on the reinforcing frame 8, and along the guide rod 31. It is arranged so as to be movable, and by this, it is arranged closer to the drive wheel (drive unit) 10 side and applies an additional weight to the drive unit 10. The counterweight 29 is displaceable in the direction opposite to the turning directions A and B of the boom 3, and as an actuator 32 for this purpose, in the illustrated embodiment, the arm 33 and the weight 29 protruding from the turning shaft 22 are provided. A wire 35 having an adjusting tool 34 such as a turnbuckle on the way is hooked and connected via a pulley 36 and the like.

The actuator 32 may be a hydraulic cylinder or a hydraulic motor. Therefore, when the boom 3 turns in the A or B direction, the counterweights 27 and 29 move in the opposite directions a or b, and in particular, the weight 29 is added to the drive unit 10 even in the movement (displacement). The weight is maintained to increase the driving force. Of course, the weights 27 and 29 ensure a left-right weight balance.

FIG. 3 and FIG. 4 show a second embodiment, which is different in that a so-called crawler type is adopted as the traveling body 12, and other points are common to the first embodiment described above, and common parts are common symbols. No. The crawler-type traveling body 12 includes a driving wheel 10 and a driven wheel 11 around which an endless belt 12A is wound around in a circulating manner and rolling wheels 12B.

[0017]

[Effect of the device]

 The present invention is as described above. According to the present invention, the driving force (traction force) can be increased while ensuring the left-right weight balance.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a side view of the first embodiment of the present invention.

FIG. 3 is a plan view of a second embodiment of the present invention.

FIG. 4 is a side view of a second embodiment of the present invention.

[Explanation of symbols]

 1 Work Cart 2 Body 3 Boom 4 Work Cage 10 Drive 12 Traveling Body 22 Slewing Axis 29 Counterweight 32 Actuator

Claims (1)

[Scope of utility model registration request] 1. A vertically movable boom (3) is pivotally mounted via a pivot shaft (22) on a vehicle body (2) equipped with a traveling body (12) and capable of traveling back and forth, In an aerial work carriage equipped with a work cage (4) at the tip of the boom (3), it can be moved in the left-right direction on the vehicle body (2) near the drive unit (10) side of the traveling body (12). A counterweight (29) is provided, and an actuator (32) for displacing the counterweight (29) in a direction opposite to the turning direction of the boom (3) when the boom (3) turns is provided. Work trolley.