JPH0626085Y2 - Work implement attachment / detachment device for tractors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention is a so-called work machine attachment / detachment device for a tractor, and in particular, a so-called attachment / detachment for attaching / detaching a work machine by raising and lowering a hitch frame attached to the rear portion of a top link and a lower link. Regarding quick hitch (or auto hitch).

(B) Conventional technology Conventionally, a connecting pin is provided in the front lower part of a working machine as a quick hitch of a tractor, a connecting part having a rear opening is provided in the rear part of the lower link, and an L-shaped locking plate is provided under the connecting part. When the connecting pin enters the opening, the locking plate rotates to prevent the connecting pin from coming out. A ratchet claw-like lock biased by a spring on the front part of the locking plate. The one in which the plate is rotatably supported, and the locking plate is provided with a step portion with which the claw at the tip of the lock plate is engaged is disclosed in Japanese Utility Model Publication No.
It is already known from Japanese Patent Publication No. 99708.

(C) Problems to be solved by the invention In the quick hitch of the tractor, when the working machine is connected to the lower portion of the lower link and locked, the claw portion at the tip of the locking plate is press-fitted by the spring tension. However, there is a risk that the above-mentioned claw part may come off the step part of the locking plate and be unlocked unexpectedly due to the vibration of the working machine or the impact when it collides with an obstacle. In addition, when the working machine is removed and the lock is released, the claws at the tip of the lock plate are only in contact with the smooth peripheral surface of the locking plate, so the locking plate is easy to rotate and the machine body There was a problem that the work equipment could not be connected as it was when the work equipment was connected next time by converting it to the lock posture due to the vibration of the machine.

(D) Means for Solving Problems In the present invention, a hitch frame is attached to the rear portions of the top link and the lower link, and the working machine is lifted while the upper part of the hitch frame is engaged with the upper part of the working machine frame. In the tractor that connects the rear part of the hitch frame with the hitch part at the bottom of the working machine, fix the hitch body having the opening toward the rear on the lower part on both sides of the hitch frame, and A locking cam is provided which inserts and removes the provided lateral connecting pin into and from the opening of the hitch body, and which rotates at a position near the opening of the hitch body in conjunction with the inserting and removing operation of the connecting pin. The stopper cam is provided with a stopper formed of an elastic plate having a bent portion for locking at the tip and a recess into which the lock pin is fitted. When the guide pin protruding from the pin is inserted, A guide groove having a bent portion is provided at the lock position, and the stopper holds the guide pin in the bent portion of the guide groove in the locked state, and holds the bent portion at the tip of the stopper in the unlocked state. The above-mentioned problem is solved by configuring the to engage and support the guide pin to maintain the unlocked state.

(E) Action When removing the work implement, place the work implement on the ground and pull out the lock pin from the recess of the hitch body, because the locking pin is held by the bent part of the stopper and the unlocked state is maintained. , In this state, if the tractor is moved forward a little, the connecting pin comes out of the recess facing the rear of the hitch body, and in the process, the locking cam plate follows the connecting pin and pivots backward to release the lock. Taking the posture of receiving from the recess,
The lock pin moves forward when the stopper is disengaged from the guide pin, and is held while sliding while being received by the outer peripheral surface of the locking cam plate.

In this state, when the lower link and the hitch frame are lowered by the lift arm, the upper connection is released.

Next, when the working machine is mounted, the tractor is retracted to engage the upper part of the hitch frame with the connecting part of the upper part of the working machine to raise the lower link and the hitch frame, and the working machine opens the upper connecting part. It pivots forward as a center, and the connecting pin under it penetrates into the opening of the hitch body.

At that time, since the connecting pin fits into the recess of the locking cam plate, the locking cam plate rotates forward along with the movement of the connecting pin to automatically return to the locking posture, and the locking pin The lock pin fits into the recess of the locking cam to lock, the lock pin of the lock pin fits into the bent portion of the guide groove, and the stopper made of an elastic plate keeps the guide pin pushed into the bent portion. .

(F) Embodiment An embodiment of the present invention will be described with reference to the drawings. 1 is a mission case of an agricultural tractor, and a top link bracket 2a protruding from an upper rear surface thereof is a top link 2
Rotatably supports the front end of the
3, the front end of the top link 2 is connected to the front part of the connecting plate 6 fixed to the upper part of the gate type hitch frame 5, and the rear ends of the lower links 3 and 3 are connected to the hitch frame 5. The hitch bodies 7, 7 fixed to the lower ends of both ends are connected by a support shaft 8.

The rotary tiller 10 has an upper frame 11 and a lower frame 12. The downward hook 13 fixed to the front end of the upper frame 11 is fitted with the pin 15 of the connecting plate 6 and fixed to the front part of the lower frame 12. Connected plate
The connecting pin 16 projecting outward from 14 is the hitch body 7
It is fitted in the rearward facing opening 17 provided in the.

Then, the substantially cam-shaped locking cams 18, 18 overlapped with the outer surfaces of the hitch bodies 7, 7 are rotatably fitted to the support shaft 8 and fastened with washers 20a and bolts 20. On the outer periphery of the locking cam 18, there are provided a recess 21 near the rear part for engaging the connecting pin 16, and a recess 23 at the front part for fitting a lock pin 22 described later. Have,
On the upper surface of the portion of the hitch body 7 projecting forward, a guide cylinder 26 with a lid having a guide groove 25 whose outer lower part is bent forward is erected, and the lock pin 22 inserted into and retractable from the guide cylinder 26 is The guide pin 28, which is obliquely upward and inclined toward the driver's seat 27 on the mission case 1, is fitted in the guide groove 25 so as to project from the lock pin 22, and the lock pin 22 is lowered. A biasing spring 30 is supported via a receiving plate 31, and the lock position of the lower end of the guide groove 25 is formed at a bent portion 25a directed forward.

Further, a stopper 32 formed of a leaf spring screwed to the outer side surface of the locking cam 18 is arranged along the guide groove 25 in a state where the working machine is connected, and a folding pin which supports and stops the guide pin 28 at the upper portion. It has a curved part.

Next, the operation will be described. In FIG. 1, the tractor is brought close to the rotary tiller 10, and the pin 15 at the upper portion of the hitch frame 5 is moved.
Hang it on the hook 13 and lift arm 33
The lower link 3 is lifted up via 34 to show the state in which the rotary tiller 10 is in the disengagement posture or the coupling preparation posture. The locking cam 18 abuts the stopper 35 and the recess 21 in the rear portion is shown.
The opening of the lock pin matches the opening 17 of the hitch body 7, and the lock pin
22 is supported while riding on the outer periphery of the locking cam 18.

When connecting the rotary cultivator 10 in this state, if the lifter is further lifted up, the rotary cultivator 10 is pinned to the upper pin 15.
Since it rotates forward around the center, the connecting pin 16 enters into the opening 17 of the hitch body and moves forward in the process of the locking cam.
When the front end of the recess 21 is pushed to rotate 18 about the support shaft 8 and the connecting state shown in FIG. 2 is obtained, the lock pin 22 is fitted into the front recess 23 by the spring 30 and locked, The guide pin 28 is pushed forward by the stopper 32 made of an elastic body at the lower end of the guide groove 25 and fits into the bent portion 25a at the lower end of the guide groove 25 to prevent the lock pin 22 from coming off.

When removing the rotary tiller 10, the driver
As shown in FIG. 3, extend the hand backward from 27 and hold the knobs of the left and right lock pins 22, 22 and rotate them to remove the guide pin 28 from the bent portion 25a and then pull it up diagonally forward and upward. The lock pin 22 slips out of the recess 23,
28 is supported by the bent portion at the upper end of the stopper 32.

When the tractor is moved forward in this state, as shown in FIG. 4, the connecting pin 16 relatively comes out from the opening 17 of the hitch body 7 and the locking cam 18 is rotated clockwise, so that the disengagement shown in FIG. Return to the state.

Next, the stand of the rotary tiller 10 will be described with reference to Figs. 8 to 10. A horizontal tail wheel support frame 37 is connected to the rear end of the tool bar 36, and the center portion of the tail wheel support frame 37 is directed rearward. U-shaped connector 39 formed by integrally projecting a cylindrical boss 38
The boss 42 formed by welding the stand holding cylinder 41 to the outer peripheral surface of the cylindrical boss.
The base side of the stand 45, which has a taper-shaped base end and a ground plate 44 at the outer end, is loosely fitted to the outer periphery of the C pin 43 and fixed to the fixed support plate 46 of the stand holding cylinder 41 and the pin 47a. Is inserted into the washer 47 that is received by the movable washer 47, and a spring 48 that presses and biases the stand 45 toward the cylindrical boss 38 is interposed between the washer 47 and the fixed receiving plate 46. Holes 50 and 51 are formed in the lower portion and the side portion of 38.

During the tilling work, the stand 45 is substantially horizontal as shown by the chain line in FIGS. 8 and 9 (superimposed on the tail wheel support frame 37 in rear view), and the tip thereof is pushed by the spring 48 and the side portion. The stopper 52 is received by the fixed receiving plate 49.

When using the stand 45, attach the stand 45 to the spring 48.
When it is pulled out from the side hole 51 against the arrow and rotated downward, the tip end of the stand 45 slides in a state of being received by the outer peripheral surface of the cylindrical boss 38 and fits into the lower hole 50. As shown by the solid line in FIGS. 10 and 10, the ground plate 44 is grounded to support the rear part of the rotary tiller 10. That is, it is possible to easily convert the stand 45 between the use position and the storage position by simply pulling and rotating the stand 45.

(G) Effect of the invention The invention is, as described above, the top link 2 and the lower link 3.
The hitch frame 5 is attached to the rear part of the hitch frame 5 and the upper part of the hitch frame is engaged with the upper part of the working machine frame to lift the working machine to connect the rear part of the hitch frame 5 and the lower hitch part of the working machine. In such a tractor, the hitch body 7 having rearward opening portions is fixed to the lower portions of both sides of the hitch frame 5, and the lateral connecting pins 16 provided at the lower portion of the working machine frame are attached to the opening portions of the hitch body 7. A locking cam 18 which is adapted to be inserted into and removed from the hitch body 7 is pivotally supported at a position near the opening of the hitch body 7 so as to rotate in association with the insertion and removal operation of the connecting pin 16. Is provided with a stopper 32 made of an elastic plate whose front end is a bent portion for locking and a recess 23 into which the lock pin 22 is fitted, and the guide tube 26 of the lock pin 22 projects from the lock pin 22. The guide groove 2 having the bent portion 25a at the lock position as well as the inserted guide pin 28 5, the stopper 32 holds the guide pin 28 fitted in the bent portion 25a of the guide groove 25 in the locked state, and the bent portion at the tip of the stopper 32 fits in the guide pin 28 in the unlocked state. Since the lock cam 18 is configured to be engaged and supported to hold the unlocked state, the locking cam 18 is a connecting pin when the working machine is detached or connected.
It rotates following the forward / backward movement of 16 and automatically converts between the connected state and the connected preparation state, and the work machine can be attached / detached extremely easily and quickly even with a simple configuration.

Also, with the working machine connected, the lock pin 22
The guide pin 28 protruding from the
The state of being fitted into the bent portion formed in the guide groove 25 of 26 is held by the stopper 32 made of an elastic plate, and is locked even if the machine body vibrates or the working machine collides with an obstacle. The state is securely held, and accidental accidents will not be unlocked accidentally, and the guide pin 28 of the lock pin 22 is held by the bent part of the stopper 32 in the unlocked state with the working machine removed Therefore, the unlocked state can be surely held, and the next work machine connecting work can be performed easily and surely.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a side view showing a connecting pin and a hitch body of a working machine in a detached state or a ready state for connection, and FIG. FIG. 3 is a side view of a disengagement preparation state, FIG. 4 is a side view of a disengagement progressing state, FIG. 5 is a cross-sectional view of essential parts, and FIG. 6 is a side view showing a state in which a rotary tiller is connected to the rear part of the tractor. Fig. 7 is a perspective view of an essential part, Fig. 8 is a plan view of a stand attaching device, Fig. 9 is a sectional view taken along line AA of Fig. 10, and Fig. 10 is a sectional view taken along line BB of Fig. 9. Is. 3 ... Lower link, 5 ... Hitch frame, 7 ... Hitch body,
8 ... Support shaft, 10 ... Rotary tiller, 16 ... Connecting pin, 18 ... Locking cam, 21,23 ... Recess, 22 ... Lock pin

Claims (1)

[Scope of utility model registration request] 1. A rear portion of the hitch frame 5 by mounting a hitch frame 5 on the rear portion of the top link 2 and the lower link 3 and lifting the working machine while the upper portion of the hitch frame is engaged with the upper portion of the working machine frame. In a tractor configured to connect a lower part of a working machine with a hitch part, a hitch body 7 having rearward opening portions is fixed to lower parts of both sides of the hitch frame 5, and a lateral direction provided in a lower part of the working machine frame. The connecting pin 16 is inserted into and removed from the opening 17 of the hitch body 7, and is rotated at a position near the opening 17 of the hitch body 7 in association with the inserting and removing operation of the connecting pin 16. The stop cam 18 is pivotally supported, and the locking cam 18 is
A stopper 32 made of an elastic plate having a bent end for locking and a recess 23 into which the lock pin 22 is fitted are provided, and a guide tube 26 of the lock pin 22 has a guide protruding from the lock pin 22. The pin 28 is fitted and the bent portion 25 is in the locked position.
By providing a guide groove 25 having a, the stopper 32 holds the guide pin 28 fitted in the bent portion 25a of the guide groove 25 in the locked state, and the stopper 32 in the unlocked state.
A work implement attachment / detachment device for a tractor, characterized in that a bent portion of a tip of 32 is configured to be engaged with and supported by a guide pin 28 to maintain an unlocked state.