JPH0327099Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a control device for a control lever in a working machine.

(Prior art) In a front loader, a pair of left and right mounting members provided on both sides of the tractor are equipped with a lift arm that can be raised and lowered by a lift cylinder, and a bucket at the tip of the lift arm can be freely rotated by a bucket cylinder. In preparation for this, by raising and lowering the lift arm using the bucket cylinder while preventing the bucket from rotating relative to the ground, the front loader can be freely changed between the mounting position and the removal position with respect to the vehicle. It is equipped with a single operating lever that operates the lift cylinder and the bucket cylinder, and is equipped with a regulating member that completely restricts the operation of the operating lever. This prevents the arm from falling.

By the way, in a front loader like the one above,
At the time of attachment/detachment, it is necessary to move the lift arm up and down at a slow speed by rotating the bucket with a bucket cylinder at a slow speed relative to the lift arm.

However, in the past, as mentioned above, although there is a regulating member that completely restricts the operation by the operating lever, it restricts the operation of the bucket by the bucket cylinder and only allows the bucket to rotate at a very low speed. No restriction member was provided to allow this.

(Problem to be solved by the invention) For this reason, in the past, when attaching or detaching a front loader from a vehicle, the lift arm is raised and lowered at a very slow speed by the operator adjusting the amount of operation of the operating lever appropriately. Therefore, the front loader could not be easily attached to or detached from the vehicle.

The present invention uses a regulating member to prevent the lift arm from lowering when the lift arm is raised and left unattended or for inspection, and when the work equipment is attached or detached, the operating lever is regulated by the regulating member. It is an object of the present invention to provide a control device for a control lever in a working machine that allows the working machine to be easily attached and detached.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized by a restriction member 31 that restricts the operation lever 29.
The regulating member 31 is rotatably provided to prevent the lowering operation of the lift arm 9 by the lift cylinder 10 by engaging with the operation lever 29, and to prevent the operation of the working part 11 by the working part cylinder 12 from slow rotation. It is possible to freely change the position between a restricted position in which only dynamic operation is allowed, and a non-restricted position in which the control lever 29 is disengaged from engagement and allows free operation of the operating lever 29.

(Function) According to the present invention, by setting the regulating member 31 to the regulating position, the operation of the operating lever 29 is regulated, and the lowering operation of the lift arm 9 by the lift cylinder 10 is prevented, and the working part cylinder 1
Regarding the operation of the working part 11 by No. 2, only a very slow rotating operation is permitted.

Further, by setting the regulating member 31 to the non-regulating position, the operating lever 29 can be operated freely.

(Embodiment) Hereinafter, an embodiment of the present invention will be described based on the drawings of FIGS. 1 to 4. In FIG. is a bumper, and 5 is a handle.

7 is a front loader shown as an example of a working machine,
A pair of left and right mounting members 8 that are attached to both sides of the tractor body 1, a pair of left and right lift arms 9 that are pivotally supported at their base ends to each mounting member 8 so as to be able to rise and fall freely, and a pair of left and right lifts that move the lift arms 9 up and down. A cylinder 10 , a bucket 11 exemplified as a working part pivotally supported at the tip of the lift arm 9 , and a bucket 1
A pair of left and right working part cylinders 12, exemplified as working part cylinders for rotating the front loader 1, and both lift arms 9 are removably connected, and when the front loader 7 is attached or detached, it is provided in the bucket 11 to prevent its rotation relative to the ground. a pair of stands 13, and a pair of left and right braces 1 protruding forward from the mounting member 8.
4, and a control device 15 protruding rearward from the right side mounting member 8.

The mounting member 8 is tapered fitted into receiving members 17 provided on both sides of the tractor main body 1, and is removably fixed by a fixture 18.

The front part of the brace 14 is provided with a fitting part 19, and the fitting part 19 is tapered fitted to a support member 20 which is provided upright from the front vehicle bearing stand 3 so that it can be freely fitted and removed from above. In addition, the front part of brace 14 is
Support member 2 via lever 21 and fixture 22
It is detachably fixed to 0.

The front loader 7 then rotates the bucket cylinder 12 with the fixings 18 and 22 released, the bucket 11 grounded, and the stand 13 preventing its rotation relative to the ground. As shown by the solid line in Figure 2,
The mounting member 8 is fitted into the receiving member 17 and the fitting part 1
9 is fitted to the support member 20, and as shown by the imaginary line in FIG.
The fitting portion 19 is separated upward from the supporting member 2.
The position can be freely changed from 0 to a removal position in which it is removed upward.

As shown in FIGS. 1, 3, and 4, the control device 15 includes a box 25 that projects rearward from the rear surface of the right mounting member 8 via a bracket 24;
Control valve case 2 fixed in the lower part of box 25
6, a lift cylinder control valve 27 and a bucket cylinder control valve 28 built in the control valve case 26, an operating lever 29 for operating both control valves 27 and 28, a support stand 30, and an operating lever 29. It consists of a regulating member 31 etc. that regulates the operation by the user.

The lift cylinder control valve 27 is provided at the rear of the control valve case 27, and the bucket cylinder control valve 28 is provided at the front of the control valve case 27, with spools 32 and 33 protruding upward from the control valve case 27, respectively. have

A support shaft 34 protruding leftward is provided on the inner surface of the right side wall of the control valve case 27, and a swing member 35 having a substantially U-shape in plan view is swingably provided on the support shaft 34. The swinging member 35 is provided with a pivot 36 that is perpendicular to the support shaft 34, and a boss 37 is rotatably provided on the pivot 36. The lower end of the operating lever 29 is fixed to the boss 37, and the operating lever 29
is formed on the upper wall of the box 25, and the operating lever 29 extends upward from a rectangular opening 38 formed on the upper wall of the box 25. Also, boss 3
7 is provided with an engaging protrusion 39 projecting leftward, and the engaging protrusion 39 is connected to the spool 33 of the bucket cylinder control valve 28 via a ball joint 40. Further, an upper end portion of an interlocking member 41 which is U-shaped in plan view is pivotally connected to the rear end portion of the swinging member 35, and a lower end portion of the interlocking member 41 is pivotally connected to the spool 32 of the lift cylinder control valve 27.

Therefore, by rotating the operating lever 29 in the front-back direction around the support shaft 34, the swinging member 35,
The spool 32 moves up and down via the interlocking member 41, and thereby the lift cylinder 10 can be controlled by the lift cylinder control valve 27.

Further, by rotating the operating lever 29 in the left-right direction around the pivot 36, the spool 33 moves up and down via the engagement protrusion 39, whereby the bucket cylinder control valve 28 causes the working part cylinder 12 to move up and down. can be controlled.

The support stand 30 is fixed to the front part of the upper surface of the box 25, and consists of a bottom wall 43 and a pair of left and right side walls 44 projecting from both ends of the bottom wall 43. Both side walls 4
A support shaft 45 is rotatably supported on the support shaft 4, and double nuts 46 are connected to both ends of the support shaft 45 so as to be able to be screwed forward and backward.

The regulating member 31 is fixed to the support shaft 45,
A cylindrical portion 48 and a regulating portion 49 protruding from the cylindrical portion 48
and a pair of left and right side walls 50 provided at both end portions of the regulating portion 49. The cylindrical portion 48 is fitted onto the support shaft 45 and fixed by a roll pin 51, and the restricting portion 49 has a rear opening that is removably engaged with the operating lever 29 in the neutral position shown in FIG. Do U
An engaging portion 52 shown as a shaped notch is formed. By rotating the regulating member 31 together with the support shaft 45, the regulating member 31 is positioned above the opening 38 and the engaging portion 52 is brought into contact with the operating lever 29, as shown by the solid line in FIGS. As shown by the imaginary lines in both figures above, the regulating member 3
1 is inverted and placed on the front side of the support shaft 45 on the support base 30, and the position can be freely changed to a non-restricting position in which the regulating member 31 is disengaged from the engagement state with the operating lever 29. When the regulating member 31 is in the regulating position, the operating lever 29 is prevented from moving forward in the front-rear direction, that is, the lowering operation of the lift arm 9 by the lift cylinder 16 is limited, and
A rearward movement, that is, a lifting operation of the lift arm 9 by the lift cylinder 10 is permitted. At the time of regulation, an equal gap 54 is formed between the left and right side walls 44 of the support stand 30 and both double nuts 46, and the left and right side walls 44 of the support stand 30 and the cylinder of the restriction member 31 are formed. Between the portions 48, gaps 55 of the same size are formed, but the gaps 55 are larger than the gaps 54, and the regulating member 31 can be moved in the left-right direction together with the support shaft 45. Even if the double nut 46 hits the side walls 44 of the support base 30 before the cylindrical part 48, the regulating member 31 will not be damaged. Therefore, when the control lever 29 is regulated, it can be operated for the 54 minutes in the left and right directions, and by operating the lever 29 for the 54 minutes in the left and right directions,
The spool 33 of the bucket cylinder control valve 28 is slightly operated from the neutral position, and the bucket 11 is rotated at a very low speed in the vertical direction. Furthermore, the above
The distance 54 can be adjusted by screwing the double nut 46 forward and backward with respect to the support shaft 45. Further, when the regulating member 31 is in the non-regulating position, the operating lever 29
can be freely manipulated.

According to the embodiment configured as described above, the front loader 7 can be raised and left alone, or
When performing an inspection or the like, by setting the regulating member 31 to the regulating position, the forward rotation of the operating lever 29 is regulated, and the lowering of the lift arm 9 by the lift cylinder 10 is regulated. The lift arm 9 and the mounting member 8 will not be lowered due to accidental operation of the operating lever 29.

When attaching or detaching the front loader 7 to or from the tractor body, the bucket belt 11 is first grounded and the stand 13 prevents rotation relative to the ground, and the regulating member 31 is placed in the regulating position. Move the lever 29 in the left and right direction between 5
The rotation operation is performed for 4 minutes, and as a result, the bucket cylinder 12 rotates the bucket 11 relative to the lift arm 9 at a slow speed, and the lift arm 9 moves up and down at a slow speed.
Since the operator does not need to appropriately adjust the amount of operation of the operating lever 29 as in the conventional case, the front loader 7 can be easily attached and detached.

Figures 5 and 6 show a regulating device different from the present invention, in which a mounting plate 5 is fixed to the tractor body.
8, a control valve 59 such as the lift cylinder 1 is fixedly installed, and an operating lever 60 is provided rotatably around a horizontal shaft 62 via a protrusion plate 61, so that the control valve 59
It is placed at the rear. A spool 63 that projects rearward of the control valve 59 is connected to the operating lever 29 via a connecting shaft 64, and an engaging piece 65 that projects inward is fixed to the connecting shaft 64. Mounting plate 58
An operating shaft 67 is inserted into the support case 66 fixed to the supporting case 66 so as to be movable in the left-right direction, and the outer end of the operating shaft 67 has a bifurcated shape in plan view and is fitted into the engaging piece 65. A forked portion 68 is formed to be removably fitted on the outside, and a grip portion 69 is provided at the inner end. The support case 66 is equipped with a roll pin 70, and the roll pin 70 is engaged with a groove 71 formed in the axial direction of the operating shaft 67 so as to be relatively movable, thereby preventing rotation of the operating shaft 67. ing. Further, the support case 66 includes an operation shaft 67.
A ball 73 is provided which is urged to move forward and backward by a spring 72, and the ball 73 is removably engaged with one of a pair of engagement recesses 74 formed in the operating shaft 67. As shown by the solid line in FIG.
5, and a disengaged position where the fork 68 is disengaged from the engagement piece 65, as shown by the imaginary line in FIG. A regulating bolt 75 in the front and back direction is screwed into the front and rear walls of the forked portion 68 so as to be freely advanced and retracted from the outside, and is fixed by a lock nut 76.
By setting the control bolt 75 to the regulating position, the tip of the regulating bolt 75 is located before and behind the engagement piece 65, and thereby the locking or swinging amount of the spool 63 of the control valve 59 can be limited to a predetermined amount.

(Effects of the invention) As detailed above, according to the invention, when the lift arm is raised and left unattended or when inspected, etc., the control member is placed in the restriction position, so that the control lever can be operated. In addition to preventing the lift arm from descending, by placing the regulating member in the regulating position when attaching and detaching the work equipment,
Since the operator can appropriately adjust the amount of operation of the operating lever, the working machine can be easily attached and detached.
The present invention not only has the above-mentioned advantages, but also has a simple structure and is very useful.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention,
Figure 1 is a partial cross-sectional plan view of the main part, Figure 2 is an overall side view, Figure 3 is a longitudinal cross-sectional view of the main part, and Figure 4 is a partial cross-sectional view of the main part.
The sectional view taken along the line A-A in the figure, and FIGS. 5 and 6 show a control lever control device different from the present invention.
The figure is a side view, and FIG. 6 is a partially sectional plan view. DESCRIPTION OF SYMBOLS 1... Tractor body, 7... Front loader (work equipment), 8... Mounting member, 9... Lift arm, 10... Lift cylinder, 11... Bucket, 12... Bucket cylinder, 15... Control Device, 29...operation lever, 31...regulating member.

Claims (1)

[Scope of utility model registration request] A lift arm 9 of a working machine 7 detachably provided on a vehicle is movable up and down by a lift cylinder 10, and a working part 11 is rotatably provided at the tip of the lift arm 9 by a working part cylinder 12, and the working part is grounded. By raising and lowering the lift arm 9 using the work unit cylinder 12 while preventing the rotation of the work equipment 11 relative to the ground, the work equipment 7 can be freely changed between the mounting position and the removal position with respect to the vehicle, and the lift cylinder 10 and the lifting arm 9 can be moved up and down. In the cylinder 12 which is operated by a single operating lever 29, a regulating member 31 that regulates the operating lever 29.
The regulating member 31 is rotatably provided to prevent the lowering operation of the lift arm 9 by the lift cylinder 10 by engaging with the operation lever 29, and to prevent the operation of the working part 11 by the working part cylinder 12 from slow rotation. Operation of a work machine characterized by being able to change its position freely between a restricted position that allows only dynamic operation and a non-restricted position that disengages from engagement with the operating lever 29 and allows free operation of the operating lever 29. Lever regulator.