JPS6210316Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a boom for a work vehicle.
The boom of a work vehicle such as a crane boom, which is attached to a swivel platform mounted on a vehicle such as a truck, can cover a wide range of work when in use, and can cover a wide range of work when not in use, that is, when the work vehicle is moving. Since it is desired to be stored as compactly as possible, a boom consisting of a base boom and a folding boom whose base end is connected to the tip of the base boom so as to be foldable with respect to the base boom is used. It is widely used. In the conventional boom of this type, as shown in FIG. A hydraulic cylinder 28 is interposed between the bending booms 2, and the bending boom 2 is rotated about the support shaft 27 with respect to the base boom 1 by extending and contracting the hydraulic cylinder 28. In such a configuration, since the hydraulic cylinder 28 for the bending operation of the folding boom is disposed outside the base boom 1, the space occupied by the related connection portion of the base boom 1 and the folding boom 2 is large. Not only that, but there was a risk that the hydraulic cylinder 28 would be hit by an object and be damaged.

The present invention is a new work vehicle boom that makes the related connecting parts of the base boom 1 and the folding boom 2 compact, and eliminates the risk of damage to the hydraulic cylinder during the folding boom folding operation due to external objects hitting the boom. This is what we are trying to provide.

Hereinafter, an embodiment in which the worker's boom of the present invention is implemented as a crane boom will be described in detail with reference to FIGS. 2 and 3.

In FIGS. 2 and 3, A is a crane boom, which includes a base boom 1 whose base end is connected to a swivel base C that is rotatably mounted on a vehicle B, and a base boom 1 that is connected to a swivel base C that is rotatably mounted on a vehicle B. A folding member whose base end is connected to the tip of the base boom 1 so that it can rotate between the retracted position (the state shown in Fig. 1) and the unfolded position (the state shown in Fig. 2) along the It consists of a bending boom 2. Said bending boom 2
consists of an outer boom 3 on the base end side, an inner boom 4 on the tip side that is telescopically inserted into the outer boom 3, and a hydraulic cylinder 5 internally disposed between the outer boom 3 and the inner boom 4. There is. The hydraulic cylinder 5 forms a power means for driving the folding boom 2 to extend and retract. The connection between the distal end of the base boom 1 and the proximal end of the telescopic folding boom 2 is particularly constructed as follows. That is, the hydraulic cylinder 11 is fitted into the tip of the base boom 1 so as to be extendable and retractable in the longitudinal direction of the base boom 1, and is disposed within the base boom.
A horizontal support tube 7 that can be expanded and contracted by a support tube 7, and a bracket 8 provided at the base end of the outer boom 3, which is the base end of the bending boom 2, is rotatably connected to a proper position of a bracket 9 at the tip of the support tube 7. The bracket 8, which is the base end of the bending boom 2, has its base end pivotally connected to a support shaft 10 and a bracket 13 provided above the front end of the base boom 1 through a shaft 14, and its front end is placed in an appropriate position by a shaft 15. Pivotally connected connecting rod 12
It consists of The bending boom 2, in which the tip end of the base boom 1 and the base end of the bending boom 2 are connected in this manner, is rotated as follows. That is, when the hydraulic cylinder 11 is extended from the storage position (the state shown in FIG. 2) where the folding boom 2 is inverted and folded along the base boom 1 and the support tube 7 is extended from the base boom 1, the bracket 9 and the bracket A portion of the shaft 10 that pivotally connects the base boom 1 moves in the longitudinal direction of the base boom 1. On the other hand, the bracket 13 and the bracket 8 are connected by the connecting rod 12, and the distance between the shaft 14 and the shaft 15 is kept constant, so as the support tube 7 expands, the bending boom 2 moves as shown in FIG. Rotate counterclockwise. The contraction movement of the support cylinder 7 by the hydraulic cylinder 11 rotates the bending boom 2 clockwise in FIG.

In this embodiment, when the hydraulic cylinder 11 is disposed inside the base boom 1, the outer diameter of the hydraulic cylinder 11 is made as large as possible within the base boom 1 by positioning it behind the support tube 7. The output of the hydraulic cylinder 11 is ensured.
Reference numeral 16 denotes a storage locking device for the folding boom 2, which is used to lock the inner boom 4 at the appropriate position when the folding boom 2 is inverted and folded along the base boom 1 to the storage position (the state shown in FIG. 2). and is provided at a corresponding position on the base boom 1. This locking device 1
6 is provided on the gooseneck portion 17 of the inner boom 4 of the folding boom 2 so that it is located on the side of the base boom 1 when the folding boom 2 is contracted and placed in the storage position (the state shown in FIG. 2). Engagement roller 1 arranged
8, and folding boom 2 is reduced to the storage position (second
An engagement rail 19 protruding from the side of the base boom 1 so that the engagement roller 18 engages when the bending boom 2 is extended from the state shown in the figure).
It consists of For this purpose, the telescoping folding boom 2 of the crane boom A is contracted to the storage position where it is inverted and folded along the base boom 1, and then the telescoping folding boom 2 is extended, and the engagement roller 18 of the locking device 16 is Since the engaging rail 19 is engaged with the engaging rail 19, the tip of the telescopic folding boom 2 is engaged and fixed to the base boom by the locking device 16. To disengage the locking device 16, the telescoping folding boom 2 may be retracted.

20 is a winch installed on the swivel base C, and 21 is a wire rope wound around the winch 20, which connects the winch 20 to the lower side of the base boom 1, and the shaft 1.
The end of the telescopic folding boom 2 is fixed to the hanging tool 24 via a pulley 22 pivotally supported by There is. Reference numeral 25 denotes a support shaft that connects the base end of the base boom 1 to the swivel base C in a freely undulating manner. 26 is a hydraulic cylinder interposed between the base boom 1 and the swivel base C at a proper position.

In any case, the present invention consists of a base boom 1 whose base end is connected in relation to a swivel base C which is rotatably mounted on a vehicle B, and a base boom 1 whose base end is connected to a swivel base C that is rotatably mounted on a vehicle B; The boom of a working vehicle is composed of a folding boom 2 whose base ends are connected in a manner that the base boom 1 and the folding boom 2 can be folded together.
The above-mentioned related connections are connected to a support tube 7 that is extendable and contractible by a hydraulic cylinder 11 disposed at the tip of the base boom 1 so as to be extendable and retractable in the longitudinal direction of the base boom 1, and the tip of the support tube 7 is folded at an appropriate position. A horizontal shaft 10 pivotally connects the base end of the bending boom 2 at an appropriate position, and a horizontal shaft 10 which pivotally connects the base end of the base boom 1 to an appropriate position, and a horizontal shaft 10 which pivotally connects the base end of the base boom 1 to an appropriate position, and a horizontal axis 10 which pivotally connects the base end of the bending boom 2 to an appropriate position. Since the connecting rod 12 is pivotally connected to the base boom 1 and the folding boom 2, the related connecting parts between the base boom 1 and the folding boom 2 can be made compact, and the storage position of the boom can be made compact. The practical effect is extremely large because the risk of damage to the hydraulic cylinder can be eliminated.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the boom of a conventional work vehicle, Figure 2
3 and 3 are explanatory diagrams of a crane boom implementing the telescopic folding boom storage locking device of the present invention. Vehicle...B, Swivel base...C, Boom...A, Base boom...1, Folding boom...2, Support tube...
7. Hydraulic cylinder...11, Shaft...10, Connecting rod...12.

Claims (1)

[Scope of utility model registration request] A base boom 1 whose base end is connected to a swivel base C rotatably mounted on a vehicle B so as to be adjustable in elevation.
The boom of a working vehicle is composed of a folding boom 2 whose base end is connected to the tip of the base boom 1 so as to be bendable with respect to the base boom 1. The related connection is bent at an appropriate position at the tip of the support cylinder 7, which is adjusted to expand and contract by a hydraulic cylinder 11 disposed at the tip of the base boom 1 so as to be extendable and retractable in the longitudinal direction of the base boom 1. A horizontal shaft 10 pivotally connects the proximal end of the boom 2 at an appropriate position, and a horizontal shaft 10 which pivotally connects the proximal end of the base boom 1 to an appropriate position, and a horizontal shaft 10 which pivotally connects the proximal end of the base boom 1 to an appropriate position, and the tip thereof to an appropriate position at the proximal end of the bending boom 2. A boom for a work vehicle characterized by comprising connecting rods 12 that are pivotally connected.