JPH0571139A - Operating lever device for attaching and detaching of backhoe - Google Patents

Abstract

PURPOSE:To simply and safely execute the attaching and detaching operations of a backhoe attached to a car body. CONSTITUTION:One operating lever 51, which is connected with operating lever mechanisms 30, 32 to independently operate the right and left outriggers and boom of a backhoe attached to a tractor body and can simultaneously operate the mechanisms 30, 32, is provided. At the time of attaching and detaching the backhoe, the right and left outriggers 11 and the boom 18 can be inchingly operated by the one operating lever 51. In addition, a stopper 62 to regulate the inching operation range of the operating lever 51 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating lever device used when attaching and detaching a backhoe which is detachably attached to a vehicle such as a tractor.

[0002]

2. Description of the Related Art A backhoe mounted on a rear portion of a tractor has a machine frame detachably mounted on a vehicle body,
Outriggers are pivotally mounted on the left and right sides of the machine frame so as to be vertically swingable, and booms are pivotally mounted on the rear portion of the machine frame so as to be vertically swingable. An arm is rotatably attached to the tip of the boom, and a bucket is provided at the tip of the arm. The left and right outriggers and the boom are vertically swung by independent operating lever mechanisms. To attach and remove the backhoe to and from the tractor, lower the boom to ground the tip of the arm, and support the machine frame with the boom (and arm) and the left and right outriggers. Move and attach and detach the backhoe.

[0003]

In the above-mentioned conventional apparatus, when the backhoe is attached to or detached from the tractor, the operating lever for operating the left and right outriggers and the boom is used for connecting or disconnecting the connecting mechanism for connecting the tractor and the backhoe. Inching the lever of the mechanism to raise and lower the machine frame so that the backhoe body does not tilt and fall,
It required skill and was a dangerous task.

Therefore, it is an object of the present invention to make it possible to easily and safely perform the attaching / detaching operation when attaching / detaching the backhoe to / from the vehicle body.

[0005]

[Means for Solving the Problems] The technical means taken by the present invention to achieve the above-mentioned object is to make an outrigger 11 vertically swingable on both left and right sides of a machine frame 8 which is detachably mounted on a vehicle body 1. In addition to pivoting, a boom 18 is pivotally mounted on the machine frame 8 so as to be vertically swingable, and independent operating lever mechanisms 30 and 3 for vertically swinging the left and right outriggers 11 and the boom 18 respectively.
When the machine frame 8 is attached to or detached from the vehicle body 1, the tip end side of the arm 20 pivotally attached to the tip end of the boom 18 is grounded so that the boom 18 and the left and right outriggers 11 maintain the attachment / detachment posture. In the backhoe, the operation lever mechanisms 30, 32 for vertically swinging the left and right outriggers 11 and the boom 18 are operated.
One operation lever 51 that is detachably connected to the operation lever mechanism 30 and 32 and that can operate the operation lever mechanisms 30 and 32 at the same time, and a restriction unit 62 that restricts an operation range of the operation lever 51. ..

[0006]

[Operation] When the backhoe 7 is attached to or detached from the vehicle body 1 of the tractor, the attachment / detachment operation lever 51 is connected to the operation lever mechanisms 30, 32 for operating the left and right outriggers 11 and the boom 18.
Then, the operation lever mechanism 3 is operated by the operation lever 51.
Since 0 and 32 are operated simultaneously, the left and right outriggers 11 and the boom 18 can be operated by one operation lever 51, and the backhoe 7 can be easily attached and detached. Further, since the operation area of the operation lever 51 is restricted by the restriction means 62, the inching operation of the operation lever 51 is easy and safe.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 1 denotes a tractor vehicle body, which has a front wheel 2 and a rear wheel 3, and a driver's seat 5 is provided behind a steering wheel 4 so that the posture can be freely changed between a forward posture and a rearward posture. A front loader 6 is mounted on the front part of the tractor body 1, and a backhoe 7 is mounted on the rear part.

The backhoe 7 is provided with a machine frame 8 which is detachably attached to the rear end of the tractor vehicle body 1 through a connecting mechanism. The machine frame 8 is vertically rocked on both left and right sides by expansion and contraction of hydraulic cylinders 10. A movable outrigger 11 is provided. As shown in FIGS. 3 and 4, this outrigger
A base end of 11 is pivotally mounted via a pin between a pair of front and rear brackets 12 projecting outward from the machine frame 8 on the left and right sides, and a ground plate 13 is attached to the tip. The hydraulic cylinder 10 is located above the outrigger 11, and its base is pivotally mounted between the brackets 12 via pins, and its tip is pivotally attached to the tip of the outrigger 11.

A lock pin 14 is provided on the lower portion of the bracket 12 so as to be inserted and removed between the front and rear brackets 12. This lock pin 14, as shown in FIG.
At the time of transporting the tractor, the outrigger 11 is located under the outrigger 11 base with the outrigger 11 raised, and the outrigger 11 can be regulated so as not to descend due to oil leak of the hydraulic cylinder 10, and as shown in FIG. When the backhoe is retracted, it is located above the base of the outrigger 11 with the outrigger 11 lowered and grounded, so that the outrigger 11 does not rise relative to the machine casing 8 due to oil leak from the hydraulic cylinder 10. Can be regulated. The lock pin 14 is attached to the reinforcing plate 15 that reinforces the bracket 12.
The insertion hole 16 for insertion is formed, and the lock pin 14 is inserted and retained in the insertion hole 16 when the backhoe 7 is being worked.

At the rear part of the machine frame 8, a swing frame 17 which is swingable right and left around a vertical axis is attached. The base of a boom 18 is pivotally attached to the lower rear portion of the swing frame 17, and the boom 18 is a swing frame.
The boom cylinder 19 which is a hydraulic cylinder provided between the boom 17 and the boom 18 is expanded and contracted to swing up and down around the pivot 22. A base of an arm 20 is pivotally attached to the tip of the boom 18, and the arm 20 is rotated about a pivot 23 by expanding and contracting the arm cylinder 21. A bucket 25 is attached to the tip of the arm 20 via a link mechanism 24, and the bucket 25 is rotated by a bucket cylinder 26.

A step 27 is provided on the upper part of the machine frame 8, and a control box 29 is supported on the step 27 via a bracket 28. As shown in FIG. 1, the control box 29 includes a pair of outrigger operating lever mechanisms 30 for independently swinging the left and right outriggers 11 up and down independently, and a boom operating lever mechanism 32 for vertically swinging the boom 18. And are provided.

The outrigger operation lever mechanism 30 is arranged side by side on the upper surface side of the control box 29.
It is equipped with a book operation lever 33, 34, and each operation lever 33, 34
The pair of rockers 36 and 37, which are swingably supported around a support shaft 35 in the left-right direction in the control box 29, are attached to the front end sides of the rockers 36 and 37, respectively, and are rocked back and forth. Each rocker 3
The rear of the support shaft 35 of 6,37 is connected to the vertical spools 42,43 of the control valves 40,41 for controlling the hydraulic cylinder 10 of the outrigger 11 via rods 38,39. Control valve 40,41
Is a mechanical three-position switching valve having a return spring for returning the spools 42, 43 to the neutral position.
By rocking 33, 34 back and forth, the hydraulic cylinder 10 is expanded and contracted, and the outrigger 11 is rocked vertically. In addition, the engaging projections 4 are
5,46 are projected respectively.

The boom operation lever mechanism 32 is provided with one operation lever 44 arranged on the upper surface side of the control box 29, and this operation lever 44 is fixed to the first rocker 47.
The first oscillating member 47 is supported by a second oscillating member 48, which is open rearward and has a U-shape in a plan view, which is rotatably supported about an axis in the front-rear direction.
The control valve is swingably supported in the front-rear direction via a support shaft 49 in the left-right direction, and by swinging the operation lever 44 back and forth from the neutral position, the control valve is a three-position switching valve for controlling the boom cylinder 19. Is operated, the boom cylinder 19 is expanded and contracted, and the boom 18 is vertically rocked. An L-shaped engagement rod 50 is provided on the first oscillating member 47 so as to project rearward. The bucket cylinder 26 is controlled by swinging the operating lever 44 left and right.

Further, the control box 29 is provided with an operation lever 51 which is connected to the outrigger operation lever mechanism 30 and the boom operation lever mechanism 32 when the backhoe 7 is attached or detached, for operating these operation lever mechanisms 30, 32 at the same time. It is provided. The operation lever 51 is provided with an operation rod 53 projecting rearward from a vertically long slot 52 formed in the rear wall of the control box 29.
53 is fixed to the rear end of the oscillator 54. The oscillating member 54 is formed to have an open U-shape in a side view, and a pair of front and rear blocks 55 and 56 are interposed between the upper and lower walls 54a and 54b. An elongated hole 57 is formed between the blocks 55 and 56, and the oscillating member 54 is externally fitted to the support shaft 58 in the left-right direction through the elongated hole 57, and the operation lever 51 is connected to the support shaft 58. It is supported so that it can swing up and down and can move back and forth.

The block 55 on the front side of the rocker 54 is located rearward from the front end, and the front part of the rocker 54 fits into the engaging projections 45, 46 of the outrigger operating lever mechanism 30. It is a fitting part 59. In addition, the rocker 54 has a support rod
60 is fixed, and a U-shaped fitting body that is fitted to the rear portion of the engaging rod 50 of the boom operation lever mechanism 32 is fixed to the support rod 60.
61 is stuck. Therefore, the fitting portion 59 should be
While the fitting body 61 is fitted to the engaging rods 50 on the 45 and 46, the operating rod 53 is moved up and down to support the operating lever 51.
By swinging around 58, the swingers 36, 37, 47 will move to the spindle 3
Swing back and forth around 5,49 to move the left and right outriggers 11
And the boom 18 can be operated at the same time. Here, the distance between the support shaft 58 and the engaging portion of the engagement rod 50 with respect to the distance between the support shaft 58 and the engagement protrusions 45, 46 is such that the machine frame 8 of the backhoe 7 can move up and down horizontally. The link ratio is set.

Stoppers 62 are provided at the upper and lower portions of the long hole 52 formed in the rear wall of the control box 29.
The vertical swing operation range of 51 is restricted. The stopper 62 has a pair of holding plates arranged inside and outside the rear wall of the control box 29, and is fixed in position or movable up and down by moving the holding plates toward and away from each other by a thumbscrew.

In the above construction, when the backhoe 7 is attached to or detached from the tractor body 1, the backhoe 7 lowers the boom 18 to ground the tip end side of the arm 20 as shown in FIG. 20) and left and right outriggers 11
And are held in a detachable position. Backhoe 7 Move the operating lever 51 for attaching / detaching operation forward to engage the fitting part 59
The fitting body 61 and the engaging rod 50 are fitted to the fitting levers 5, 46, respectively, and the operating lever 51 is connected to the operating lever mechanisms 30, 32. Then, by inching the operation lever 51 up and down, the operation lever mechanisms 30 and 32 are simultaneously inching operated by the body levers, and the tractor body of the backhoe 7
The operation of connecting or disconnecting 1 is performed. At this time, the inching operation area of the operation lever 51 is restricted by the stopper 62. And left and right outriggers 11 and boom
When each of the 18 and 18 is independently operated (for example, during backhoe work), the operation lever 51 is moved rearward and separated from the operation lever mechanisms 30 and 32 of the outrigger 11 and the boom 18. At this time, the operating lever 51 can be locked by holding the operating rod 58 between the upper and lower stoppers 62.

5 to 7 exemplify another lock mechanism that locks the outrigger 11 in a raised state at the time of transporting the tractor. The ground plate 13 has a notch 63 through which the outrigger 11 can pass. At the same time, the engaging recess 64 is formed, and the cylinder body 10a of the hydraulic cylinder 10 is provided with the lock pin 65. As shown in FIG. 7, the engagement of the ground plate 13 with the outrigger 11 raised. Mating recess 64
By fitting the lock pin 65 to the lock pin 65, the descent of the outrigger 11 is restricted.

[0019]

According to the present invention, the left and right outriggers 11 and the boom 18 can be operated with one operation lever 51, and the backhoe 7 can be easily attached and detached. Also,
The operating area of the operating lever 51 can be regulated by the regulating means 62,
The inching operation becomes easy and the safety is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part.

FIG. 2 is an overall side view of a backhoe-mounted tractor.

FIG. 3 is a view showing a usage state of a lock mechanism of an outrigger.

FIG. 4 is a view showing a usage state of a lock mechanism of an outrigger.

FIG. 5 is a plan view showing a modified example of the lock mechanism of the outrigger.

FIG. 6 is a side view showing a modified example of the lock mechanism of the outrigger.

FIG. 7 is a side action state diagram showing a modified example of the lock mechanism of the outrigger.

[Explanation of symbols]

 1 tractor body 7 backhoe 8 machine frame 11 outrigger 18 boom 20 arm 30 operation lever mechanism 32 operation lever mechanism 51 operation lever 62 stopper (restriction means)

Claims (1)

[Claims] 1. A machine frame detachably attached to a vehicle body (1)
The outriggers (11) are pivotally attached to the left and right sides of the (8) so that they can swing up and down, and the boom (18) is pivotally attached to the machine frame (8) so that they can swing up and down. (18) Independent operation lever mechanism (30) for swinging up and down respectively
When the machine frame (8) is attached to and detached from the vehicle body (1), the tip end side of the arm (20) pivotally attached to the tip end portion of the boom (18) is grounded to the boom (18). In the backhoe that holds the attachment / detachment posture with the left and right outriggers (11), it can be attached to and detached from each operation lever mechanism (30) (32) that vertically swings the left and right outriggers (11) and the boom (18). It is equipped with one operating lever (51) that is connected and can operate each of the operating lever mechanisms (30) (32) at the same time, and is provided with a regulating means (62) for regulating the operating range of the operating lever (51). Operation lever device for attaching and detaching backhoe.