JPH0429687Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a working machine coupling device, and is used to detachably connect a working machine such as a rotary tiller to a tractor.

(Prior Art) For example, when connecting a rotary tiller to a tractor via a three-point link mechanism, the lower link of the three-point link mechanism and the tiller can be easily connected and disconnected. In order to achieve this, a connecting pin is provided at the tip of the lower link, a bracket is provided on the tilling device, a receiving portion is formed in the bracket to which the connecting pin is removably engaged, and a receiving part is formed in the bracket to be removably engaged with the connecting pin. A rotatable hook that engages and prevents the connecting pin from detaching from the receiving portion is provided, and the hook can be freely changed into a detachment prevention posture that prevents the detachment and a detachment permitting posture that allows the detachment. There are some examples (for example, in 1987-
141711).

By the way, in the above-mentioned conventional art, no means was provided for preventing the hook from changing its posture from the detachment-preventing posture to the detachment-allowing posture.

(Problem to be solved by the invention) For this reason, in the above conventional method, if abnormal vibrations occur due to soil conditions etc. during tilling work, the hook may rotate unexpectedly and move from the breakaway prevention position. The posture was changed to a detachment-permitting posture, and as a result, there was a risk that the connecting pin might detach from the engagement portion of the bracket.

An object of the present invention is to provide a coupling device that can solve the above problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized in that a connecting pin 10 is provided at the tip of the connecting link 7 on the tractor 1 side, and the connecting pin 10 can be attached or detached. A bracket 19 is provided on the work machine 17 side, and has a receiving part 20 that receives the parts so as to be freely connected, and a hook 22 that is removably engaged with the connecting pin 10 to prevent the connecting pin 10 from coming off the receiving part 20. In the work equipment coupling device rotatably provided on the bracket 19, the hook 22 is removably engaged with the hook 22 to prevent the hook 22 from changing its posture from a detachment prevention posture to a detachment permitting posture. A locking member 32 is rotatably provided, and the locking member 32 can freely change its posture between a change-preventing posture that prevents the posture change and a change-allowing posture that allows the posture change. Further, the locking member 32 has a locking pin 35, and the hook 22 is connected to the connecting pin 10.
The receiving portion 20 of the bracket 19 is provided with an engaging portion 20A of the lock pin 35 in order to prevent the lock pin 35 from moving upward and detaching from the bracket 19 at the position where it is sandwiched from the front and rear.

(Function) According to the present invention, when connecting the lower link 7, which is a connecting link, with the rotary tilling device 17, which is a working machine, first, as shown in FIG. The hook 22 is set in a detachment-permitting posture.

That is, the hook 22 is retracted from the receiving part 22 by being supported by a sensing lever 38 extending vertically across the middle of the receiving part 20 in the receiving direction on the bottom surface of the distal end side of the hook 22 which is rotatable about the horizontal shaft 23 as a fulcrum. It is set in a position that allows for withdrawal.

Next, the connecting pin 10 of the lower link 7, which is a connecting link, is advanced in the direction of arrow E in FIG. When the hook 22 is fitted into the receiving part 20 of the bracket 19, the hook 22 is rotated in the direction of arrow A about the horizontal shaft 23, and the connecting pin 10 fitted into the receiving part 20 is placed in a detachment prevention position as shown in FIG. When the hook 22 is rotated, the lock member 32 is also rotated together.

Furthermore, the locking member 32 is attached to a second
By being rotated in the direction of arrow C in the figure, the hook 22 is sandwiched between the connecting pin 10 and the locking member 32 from the front and rear directions, thereby preventing the hook 22 from changing its posture from the detachment prevention posture to the detachment permitting posture. .

That is, when the lock pin 35 of the lock member 32 cooperates with the connecting pin 10 to clamp the hook 22 from the front and back, the lock pin 35 engages with the engaging portion 20A formed in the receiving portion 20 of the bracket 19. This prevents upward movement and withdrawal.

Therefore, even if abnormal vibrations occur due to soil conditions or the like during tilling work using the tilling device 17, which is a working machine, the hook 22 will inadvertently rotate and the posture will be changed from the detachment prevention posture to the detachment permitting posture. Therefore, each collar 12,1 of the connecting pin 10
3 will not accidentally come off from the receiving portion 20 of the bracket 19.

Next, when releasing the connection between the lower link 7, which is the connection link, and the tilling device 17, which is the working machine, the operation may be performed in the reverse order to the above.

That is, after the lock member 32 is rotated in the direction of arrow B in FIG. It makes them break away from it.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. In Fig. 5, 1 is a tractor, 2 is a tractor body, and a pair of left and right lift arms 3 are mounted on the rear upper surface of the vehicle body 2. A hydraulic system 4 for lifting and lowering the working machine is mounted.

5 is a three-point link mechanism, consisting of a top link 6 in the center and a pair of lower links 7 on the left and right.
are connected via.

As shown in FIGS. 1, 2, and 3, a ball joint 9 is provided at each rear end of the pair of left and right lower links 7, and a connecting pin 10 is inserted through the ball joint 9 in the left-right direction. ing.

The left and right connecting pins 10 are connected by a connecting body 11 that is fitted onto the connecting pin 10, and collars 12 and 13 are fitted onto both ends of the connecting pin 10, respectively. 14 is a guide collar, 15 is a nut, and 16 is a retaining pin.

Note that here, the pair of left and right lower links 7 serve as connecting links.

A working machine 17 is exemplified as a rotary tiller in this embodiment, and is connected to the tractor 1 via a three-point linkage mechanism 5 so as to be movable up and down and detachable.

As shown in FIGS. 4 and 5, the tilling device 17 has a pair of left and right support arms 18, and each support arm 18 has a pair of left and right brackets 19 projecting forward. Each bracket 19
In the center of the front part in the vertical direction, a receiving part 20 is cut out from the front side, and a connecting pin 1 is inserted into each receiving part 20.
0 collars 12 and 13 are removably engaged.

The left and right pair of brackets 19 have different shapes as shown in FIG. 4, and the outer bracket 19 has a triangular chevron shape in side view on the upper side and has an engaging portion 21 on the rear end side.

Furthermore, a hook 22 is rotatably provided on the inside of each of the pair of left and right brackets 19 by a horizontal shaft 23, and the horizontal shaft 23 is connected to an end plate 24 as shown in FIG.
It is attached to one bracket 19 via a nut 25, and the other end is inserted into and supported by the other bracket 19.

The hook 22 is connected to each collar 12 of the connecting pin 10,
13 from the upper side to prevent the connecting pin 10 from detaching from the receiving part 20.
As shown in FIG. 2, the hook 22 has a detachment prevention posture for preventing the above-mentioned detachment, and as shown in FIG.
It is said that the posture can be freely changed to a detachment-permitting posture that allows the above-mentioned detachment.

Furthermore, the pair of hooks 22 on the left and right sides are connected to each other at their upper surfaces by a connecting plate 26, and an operating lever 27 is attached to the connecting plate 26 to allow the position to be changed freely.

Furthermore, the left and right pair of hooks 22 each have a cylinder boss 28 on their base end side, each of the cylinder bosses 28 is rotatably fitted around the horizontal shaft 23, and a winding portion is formed on the cylinder boss 28. One end of the spring 29 fitted with the spring 29 is engaged with the support arm 18, and the other end is engaged with the support shaft 30 on the hook 22 side, thereby engaging the hook portions 22A on the tip side of the pair of left and right hooks 22. ie, in the direction of arrow A in FIG.

Note that, as shown by reference numeral 31 in FIG. 1, a protrusion for preventing the spring 29 from coming off is formed on the support arm 18.

Reference numeral 32 denotes a lock member, which is rotatably attached to the upper inner surface of the hook portion 22A of one hook 22 via a support shaft 34 having an eccentric shaft 23.

A lock pin 35 is fixed to the lock member 32 in an outwardly projecting manner with an interaxial distance from the support shaft 34, and the lock pin 35 is parallel to the connecting pin 10 in the axial direction.

The lock member 32 is rotatable about the support shaft 34 between directions B and C in FIG.
A lock pin 35 is engaged with the rear surface (tractor side) of the hook 22, and the hook 22A of the hook 22 is held between the connecting pin 10 and the lock pin 35, thereby making it possible to prevent the connecting pin 10 from detaching from the hook 22.

That is, the change preventing posture of the locking member 32 is such that it is engaged with the hook 22 and the hook 22 is connected to the connecting pin 1.
The receiving portion 20 of the bracket 19 is provided with an engaging portion 20A with which the lock pin 35 engages from below in order to prevent the lock pin 35 from coming off at the pinching position.

In the rotation of the lock member 32 between the B position and the C position, the rotation in the C direction may be performed simply by the rotation of the lock member 32 due to its own weight, but in this embodiment, one end of the spring 36 is wound around the eccentric shaft 33. Along with multiplying
A spring 3 is attached to a support shaft 37 attached to the hook 22.
It is preferable to wrap the other end of the spring 36 around the spring 36 and urge it in the direction C using the elastic force of the spring 36.

In addition, in FIG. 2, the line segment D-D is the spring 3
6, and the spring 36 has an elastic force above and below this line segment.

Therefore, when the locking member 32 is rotated from the line segment D-D to the direction B about the support shaft 34, the spring 3
This is done against the elastic force of 6.

38 is a sensing lever, which is swingably attached to the inner surface of the bracket 19 below the receiving portion 20 via a support shaft 39;
In the standing position shown in FIG. 3, the hook 22 vertically traverses the middle of the receiving portion 20 in the front-rear direction, is biased by the spring 40 in this standing position, and is in the detachment-permitting position. Hook part 22A
The hook 22 is engaged with the lower end of the hook 22 to maintain a detachable attitude.

Therefore, from the state shown in FIG.
When advanced in the direction of the arrow E, the connecting pin 10 is pushed in against the elastic force of the spring 40 with the sensing lever 38 in the direction of the arrow F using the support shaft 39 as a fulcrum, and each collar 12, 13 is received. 1 and 2 through the rotation of the hook 22 in the direction of arrow A and the rotation of the lock member 32 in the direction of arrow C.

The pressing of the sensing lever 38 is restricted by a stopper 41, and when the connecting pin 10 is removed from the receiving portion 20, the sensing lever 38 is returned by the spring 40 in the direction opposite to the arrow F, and returns to the position shown in FIG. It will return to the solid line position.

Note that the hook 22 can be held in a release-permitting posture using the sensing lever 38, but from this state shown in FIG.
2 is moved further back, and the lock member 3 is
2 is rotated about a support shaft 34 in the direction of arrow H in FIG. 3, and the lock pin 35 is engaged with the engaging portion 21 as shown by the chain line in FIG.

Here, it goes without saying that even if the hook 22 is moved back significantly, the sensing lever 38 is maintained in the upright position by the stopper 41.

Further, in the embodiment, a lower link is used as the connecting link, but other types such as a draw bar, a swing bar, etc. may be used as the connecting link, and furthermore, something other than a tilling device may be used as the working machine.

(Effects of the invention) As detailed above, according to the invention, it is possible to easily connect and uncouple the connection link and the work machine, and when the connection link and the work machine are connected, the vibration of the work machine is reduced. There is no risk that the hook will rotate unexpectedly and the connecting pin will come off from the receiving part of the bracket.

The locking pin of the locking member cooperates with the connecting pin and engages with an engaging part formed in the receiving part of the bracket to prevent the hook from moving upward at the position where the hook is sandwiched from the front and back, so that the hook does not come off due to vibration. It can definitely be prevented. The present invention has the above advantages and is of great practical benefit.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a cross-sectional plan view of the main part, Fig. 2 is a longitudinal cross-sectional view along the line of Fig. 1, and Fig. 3 shows an operating state different from Fig. 2. Fig. 4 is a perspective view of the main part, Fig. 5 is a longitudinal cross-section of the main part showing the
The figure is an overall side view. DESCRIPTION OF SYMBOLS 1... Tractor, 7... Lower link (connection link), 10... Connection pin, 17... Rotary tilling device (work machine), 19... Bracket, 20...
...Receiving portion, 22...Hook, 32...Lock member.

Claims (1)

[Claims for Utility Model Registration] A connecting pin 10 is provided at the tip of the connecting link 7 on the tractor 1 side, and a bracket 19 having a receiving portion 20 for receiving the connecting pin 10 in a detachable manner is provided on the working machine 17 side. A receiving portion 20 for the connecting pin 10 is provided and is detachably engaged with the connecting pin 10 .
In a work equipment coupling device in which a hook 22 for preventing detachment from the bracket 19 is rotatably provided, the hook 22 is detachably engaged with the hook 22 to prevent the hook 22 from detaching from the detachment prevention posture. A locking member 32 is rotatably provided to prevent a change in posture to a withdrawal-allowing posture, and the locking member 32 is configured to rotate between a change-preventing posture that prevents a change in posture and a change-allowing posture that allows a change in posture. Further, the lock member 32 has a lock pin 35, which prevents the lock pin 35 from moving upward and detaching at a position where the hook 22 is sandwiched from the front and back in cooperation with the connecting pin 10. A working machine coupling device characterized in that a receiving portion 20 of the bracket 19 is provided with an engaging portion 20A of a lock pin 35.