JPH0449261Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a lifting mechanism for raising and lowering attachments such as buckets and forks in working machines such as coastal cleaning vehicles and forklifts, and rotating them at the upper and lower limits. This relates to moving equipment.

[Conventional technology]

FIG. 5 is a schematic side view of a tire-type shovel as an example of a conventional working machine of this type. A bucket 4 as an attachment is rotatably supported between the free ends of the supported pair of left and right arms 3, and
The working end of the piston rod 6 of the lifting cylinder 5, which is pivotably mounted below the shaft 2, is pivotally mounted to the arm 3. Further, a link 7 pivotally attached to the center of the arm 3 and the bucket belt 4 are connected by a rod 8, and the link 7 has a piston rod of a rotating cylinder 9 rotatably supported on the vehicle body 1 side. Ten working ends are pivotally connected.

With this structure, when the piston rod 6 of the lifting cylinder 5 is retreated and the piston rod 10 of the rotating cylinder 9 is advanced, the bucket 4 touches the ground and tilts forward as shown by the solid line in the figure. When the vehicle body 1 is moved forward, dirt and contaminants are scooped into the bucket 4. Therefore, the piston rod 10 of the rotating cylinder 9 is moved backward to rotate the bucket 4 to the chain line position, and then the lifting cylinder 5 is moved. When the piston rod 6 is advanced, the arm 3 swings greatly and the bucket 4 rises to the position shown by the chain line 4A. In this state, move to the destination and remove the piston rod 10 of the rotation cylinder 9.
When the bucket cart 4A is moved forward, the bucket cart 4A rotates as shown by the chain line 4B, and the earth and sand are discharged to the loading platform of the truck or the collection area.

[Problem that the invention attempts to solve]

However, in the lifting and lowering rotation device of the attachment in such conventional work machines, the rotation device is composed of a link mechanism, so in order to ensure a certain rotation angle or more, it is necessary to change the shape of the arm and bucket. , or there was a problem that the link configuration was subject to restrictions. In addition, during the ascent process of the bucket cart 4 from the lower limit position to the upper limit position, the posture changes from tilting forward to tilting backward, and a horizontal posture cannot be ensured, so when this is applied to a forklift, etc., the load may collapse. There was a risk of

[Means for solving problems]

In order to solve these problems, in the present invention, an attachment is rotatably supported between the free ends of a pair of arms that are pivotally supported on a horizontal axis on the vehicle body side, and the piston rod of the lifting cylinder on the vehicle body side is Attachment rotating means is provided, the working end of which is pivotally connected to the arm, and the horizontal shaft and the end shaft of the attachment are drivingly connected by a chain to rotate the horizontal shaft in forward and reverse directions by a predetermined angle.

[Effect]

When the piston rod of the lifting cylinder moves forward, the arm rotates around the horizontal axis and the descending attachment rises, but during this rise the sprocket on the horizontal axis remains stationary and the arm rotates. The chain revolves around the
The attachment remains in the same position. When the rotation means is operated, the chain rotates and the attachment rotates.

〔Example〕

Figures 1 to 4 show an example of a coastal cleaning vehicle in which the device for lifting and lowering the attachment of the working machine according to the present invention is implemented. FIG. 2 is a side view of the device, FIG. 2 is a cross-sectional view near the horizontal axis, FIG. 3 is a side view from A in FIG. be. In the figure, a chassis 22 is supported on a running track 21 of a beach cleaning vehicle 20, and a pair of left and right bearings 24 are integrally formed on a bearing stand 23 that is integrally formed at the front end of the chassis 22. A horizontal shaft 25 is rotatably supported on the bearing 24, and a pair of left and right arms 26 are rotatably supported on the horizontal shaft 25. On the other hand, a lifting cylinder 28 is rotatably supported on a bracket 27 integrally formed at the front end of the chassis 22, and the working end of a piston rod 29 is pivotally connected to the center of an arm 26. ,
By moving the piston rod 29 forward and backward, the arm 26 is configured to swing about the horizontal axis 25 between the position shown by a solid line and the position shown by a chain line in the figure. Reference numeral 30 denotes a rotating cylinder located above the lifting cylinder 28 and rotatably connected to the bracket 27, and the operating end of the piston rod 31 is connected to a lever 33 fixed to the horizontal shaft 25 with a key 32. The piston rod 31 is pivoted through a pin 34, and the horizontal axis 2 is moved by moving the piston rod 31 back and forth.
5 is configured to rotate in forward and reverse directions by a predetermined angle.

An end shaft 35 is rotatably supported at the free end of each of the left and right arms 26, and a bucket 36 as an attachment formed in the shape of a gutter that opens upward is attached to these end shafts 35. are integrally formed. A chain 4 is connected between a sprocket 38 fixed to the horizontal shaft 25 with a key 37 and a sprocket 39 fixed to one end shaft 35.
0 is stretched, and the rotation of the horizontal shaft 25 due to the rotation of the lever 33 is transmitted to the end shaft 35, and the bucket belt 36 is rotated. A tension sprocket 41 is supported on the arm 26 side and applies tension to the chain 40.

The operation of the elevating and rotating device configured as above will be explained. In FIG. 4a, when the piston rod 31 of the rotation cylinder 30 is advanced from the state shown by the solid line, the lever 33 rotates until it stands almost upright, and the horizontal shaft 25 rotates.
As a result, the bucket belt 36, which is integral with the end shaft 35, rotates to the position shown by the chain line in FIG. 4a. Then, when the vehicle is moved forward, Bucket 36
Since dirt and contaminants are scooped into the bucket, when the piston rod 31 of the rotary cylinder 30 is moved back, the bucket 26 returns to the position shown in solid line in FIG. 4a. Bucket 36 filled with earth and sand in this way
Since the bottom surface is horizontal, when the piston rod 29 of the lifting cylinder 28 is advanced, the arm 26 swings greatly to the position shown in FIG. 5b, and the bucket 36 rises. When the bucket cart 36 is raised, the lever 33 is fixed by the rotating cylinder 30 and the horizontal shaft 25 is stationary, so the sprocket 38 integrated therewith is also stationary. Therefore, when the arm 26 swings, the sprocket 3
Although the bucket 9 rotates with respect to the arm 26, it is apparently stationary, and the bucket 36 maintains the same posture with its bottom surface horizontal from beginning to end from the lowered position to the raised position. After the bucket 26 has been raised in this manner, when the vehicle is moved and the piston rod of the rotary cylinder 30 is advanced, the bucket 36 is moved from the horizontal position shown by the solid line in FIG. It rotates to the tilting position shown, and dirt, etc. is discharged onto the truck bed or the collection area.

In this embodiment, the rotating cylinder 30 and the lever 33 are used as examples of rotating means for the horizontal shaft 25, but the present invention is not limited to this, and a motor, a gear mechanism, or the like may be used. Furthermore, in this embodiment, a beach cleaning vehicle is used as an example of the working machine, and a bucket is used as an example of the attachment, but the working machine may be a road cleaning vehicle, a forklift, or the like, and the attachment may be a futok or the like.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in a lifting/lowering rotating device for an attachment in a working machine, the attachment is rotatably pivoted to the free ends of a pair of arms pivoted to a horizontal axis on the vehicle body side. The working end of the piston rod of the lifting cylinder on the vehicle body side is pivotally connected to the arm, and the horizontal shaft and the end shaft of the attachment are drivingly connected by a chain to rotate the horizontal shaft in the forward and reverse directions by a predetermined angle. By providing a rotation means for the attachment, when the attachment is raised by swinging the arm, it maintains the same horizontal position from beginning to end from the lower limit to the upper limit, thereby preventing the load from collapsing, such as in the case of a forklift attachment. This improves work safety. In addition, since a chain is used instead of a link mechanism to rotate the attachment, the structure is simplified, and unlike a link mechanism, the rotation angle of the attachment is not restricted. Since it can be taken freely, the functionality of the device is improved.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the elevating and rotating device for an attachment in a working machine according to the present invention, and FIG. 1 is a side view of a portion of a coastal cleaning vehicle implementing this and the elevating and rotating device; Fig. 2 is a cross-sectional view near the horizontal axis, Fig. 3 is a side view from A in Fig. 2, Figs. The figure is a schematic side view of a tire-type shovel as a working machine equipped with a conventional attachment lifting/lowering rotating device. 20... Beach cleaning vehicle, 24... Bearing, 25...
Horizontal axis, 26... Arm, 28... Lifting cylinder, 29... Piston rod, 30... Rotating cylinder, 31... Piston rod, 33... Lever, 35... End shaft, 36... Bucket, 38, 3
9...Sprocket, 40...Chain.

Claims (1)

[Scope of utility model registration request] A horizontal shaft is rotatably supported on the vehicle body, a pair of arms are pivotally supported around the horizontal shaft, and left and right end shafts are attached to the free ends of these arms. A rotatably supported attachment;
A lifting cylinder is rotatably supported on the vehicle body side and the working end of a piston rod is pivotally connected to the arm, and the piston rod is suspended between a sprocket fixed to the horizontal shaft and a sprocket fixed to the end shaft. 1. A device for lifting and lowering an attachment in a working machine, comprising a chain and an attachment rotation means for rotating the horizontal shaft in forward and reverse directions by a predetermined angle.