JPH0417641Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to a loader attaching/detaching device to a tractor for attaching a loader to the rear or front of an agricultural tractor or the like.

(Prior Art) In the conventional device for attaching and detaching a loader to a tractor of this type, when attaching the loader to the rear of the tractor, the loader is attached to the three-point link hitch of the tractor as described in Japanese Utility Model Publication No. 51-49765. It is installed on.

(Problems to be solved by the invention) In the above-mentioned conventional loader attachment/detachment device for a tractor, since the loader is attached to the three-point link hitch of the tractor, (1) it is not possible to apply force in the downward direction to the loader; Otherwise, the loader will not become double acting.

(2) It is troublesome to attach and detach the loader to the tractor, and the operation requires a lot of effort and time.

There are problems with these points.

(Means for solving the problems) In order to solve the above problems, this invention
An intermediate hitch 2 for loader b is provided with engagement recesses 14 directed downward on both intermediate sides of the lower part of the vehicle body 1 of tractor a, and an engagement groove directed obliquely outward and upward at the center of the rear end or front end. Attach the end hits 3 for loader b provided with 6, bend the tip of the lower piece of the L-shaped frame 4 of loader b upward, and fix the shaft rods 22 to both sides of the tip of the lower piece. A horizontal shaft 5 is installed in the middle part, and the horizontal shaft 5 at the middle part of the lower part of the L-shaped frame 4 is removably fitted into the engagement groove 6 of the end hitch 3. Connect the shaft rods 22 on both sides of the tip of the lower piece to the engagement recesses 14 of the intermediate hitches 2 on both sides.
The intermediate hitch 2 and the shaft rod 22 are removably fitted within the
is removably fixed by a locking pin 7 inserted into the pin hole 15 to constitute a loader attachment/detachment device to a tractor.

(Function) When the lower piece of the frame 4 of the loader b is attached to the hits 2 and 3 of the tractor a by the horizontal shaft 5 and the stop pin 7 and the piston rod 9 of the lift cylinder 8 of the loader b is advanced, the lift arm 10 is moved forward. The working implement 12 at the tip of the lift arm 10 rises by pivoting upward about the pin 11 at the base end.

On the other hand, when the piston rod 9 of the lift cylinder 8 is moved backward, contrary to the above, the lift arm 10 is forcibly rotated downward about the pin 11, and the working implement 12 at the tip of the lift arm 10 is lowered.

Also, connect the retaining pin 7 and the horizontal shaft 5 to the hits 2 and 3.
When the loader b is removed from the vehicle body 1, the loader b is separated from the tractor a, and the tractor a has a hitch 2,
Only 3 remains.

(Embodiment) Figures 1 to 4 show a first embodiment in which the loader b of this invention is used as a rear loader, and its structure will be explained with reference to the drawings. This is an intermediate hitch for the loader.
The base plate 13 on one side is fixed to the vehicle body 1, and the intermediate part of the intermediate hitch 2 has an engaging recess 14 facing downward.
A pin hole 15 is formed in both sides of the intermediate hitch 2 at the center of the engagement recess 14. Reference numeral 16 denotes a support shaft protruding from the upper part of the outer surface of the intermediate hitch 2, and a circumferential groove 17 is provided in the intermediate portion thereof. Reference numeral 18 denotes a cross arm attached to the outer end of the stop pin 7, and a through hole 19 is bored in the upper part of the cross arm. 20 is a retaining pin.

Reference numeral 3 denotes an end hitch fixed to the center of the rear end of the lower surface of the vehicle body 1, which is shaped like the one seen from the front.
Both side pieces are inclined backward and downward, and the tips are joined by bending the tip sides from the middle of the both side pieces to opposite sides, and the middle part of the rear edge of the both side pieces has an engagement groove that extends diagonally back and upward. A groove 6 is provided, and a portion below the engaging groove 6 forms a guide edge 21 inclined rearward and downward.

The frame 4 of the loader b is formed in such a shape that the lower piece faces forward when viewed from the side, and the tip of the lower piece is bent obliquely upward, and the shaft rod of the cylinder 22 is fixed to both sides of the tip. A horizontal shaft 5 is installed at the intermediate rear portion, and a cross member 23 is installed at the rear bending portion, and the base ends of both lift arms 10 are pivotally connected to the upper end of the frame 4 by pins 11. Reference numeral 24 denotes a support that projects rearward from the cross member 23, and connects the base of the lift cylinder 8 to the lift arm 1.
The tips of the piston rods 9 are pivotally connected to the holders 24 at the base of the piston rods.

13 is a bucket work tool, and the lower part is attached to pin 2.
5, it is removably pivoted to the tips of the lift arms 10 on both sides. Reference numeral 26 denotes a dump link pivotally connected to the intermediate portion of the lift arm 10 by a pin 27. This is connected to the upper part of the work implement 12 by a connecting rod 28, and the base of the lift arm 10 is connected by a dump cylinder 30 with a piston rod 29. do. Although not shown, the pressure oil generator of the tractor a, the lift cylinder 8, and the dump cylinder 30 are connected by a detachable pressure oil pipe 31.

Therefore, as shown in FIG. 1, the horizontal axis 5 of loader b
is fitted into the concave groove 6 of the end hitch 3, the cylindrical body 22 is fitted into the concave portion 14 of the intermediate hitch 2, the through hole 19 of the cross arm 18 is fitted to the support shaft 16, and the stop pin 7 is fitted. is inserted into the pin hole 15 and the hole of the cylinder body 22, and then the stop pin 20 is inserted into the pin hole of the support shaft 16, and the stop pin 20 locks the armrest 18, and the loader b is attached to the tractor a. Install.

Next, its effect will be explained.

When removing loader b from the state shown in Fig. 1, where loader b is attached to tractor a, (1) From the state shown in Fig. 1, first move piston rod 9 of lift cylinder 8 forward. ,
The frame 4 rotates clockwise in FIG. 1 about the horizontal shaft 5, and the cylindrical body 22 of the frame 4
4 so that the pin hole 15 and the hole in the cylinder body 22 are concentrically aligned, and then the stop pin 20 is removed and the stop pin 7 with the cross arm 18 is removed.

(2) Next, the piston rod 9 of the lift cylinder 8
is moved backward, and the lift arm 10 is rotated clockwise in FIG. 1 using the pin 11 as a fulcrum.

Further, when the piston rod 29 of the dump cylinder 30 is moved forward, the dump links 26 connected to each other by the connecting rod 28 use the pin 27 as a fulcrum, and the work implement 12 moves to the first position using the pin 25 as a fulcrum.
The frame 4 of loader b rotated clockwise in the figure, and accordingly, the frame 4 of loader b rotated counterclockwise in FIG. After that, the bent end portion of the lower piece of the frame 4 comes into contact with the ground.

(3) After that, as the piston rod 29 moves forward,
The frame 4 rotates counterclockwise in FIG.
is removed upward from the groove 6.

(4) Separate the pressure oil piping 31 for tractor a and loader b.

(5) Move tractor a forward.

Then, as shown in FIG. 2, loader b separates from tractor a.

On the other hand, when attaching loader b to tractor a from the above state, contrary to the above, (1) If tractor a is appropriately retreated from the state shown in FIG. The horizontal shaft 5 hits the guide edge 21 and slides upward onto the groove 6 to reach the groove 6.

(2) Connect the pressure oil piping 31 of tractor a and loader b.

(3) When the piston rod 29 of the dump cylinder 30 is moved backward, the dump link 26 connected by the connecting rod 28 rotates counterclockwise in FIG. Accordingly, the frame 4 rotates clockwise in FIG. 2 using the grounding point of the bent end of the lower piece as a fulcrum, and the horizontal shaft 5 fits into the groove 6.

(4) Thereafter, as the piston rod 29 retreats, the frame 4 rotates clockwise in FIG.
is fitted into the recess 14, and the intermediate hitch 2
The pin hole 15 and the hole in the receiving tube 22 match. At that time, if the piston rod 9 of the lift cylinder 8 is moved forward in the opposite direction to the above, the frame 4 will move towards the horizontal axis 5.
1 as a fulcrum, the cylinder 22 of the frame 4 is pressed into contact with the recess 14, and the pin hole 15 and the hole of the cylinder 22 are more securely aligned.

(5) After fitting the through hole 19 of the cross arm 18 to the support shaft 16 and inserting the stop pin 7 across the pin hole 15 and the hole of the cylinder body 22, insert the stop pin 20 into the pin hole of the support shaft 16. Insert.

Then, as shown in FIG. 1, loader b is attached to tractor a.

The engagement groove 6 extending diagonally rearward and upward of the end hitch 3 is made into an engagement groove whose horizontal deep part in the front-rear direction is bent diagonally forward and downward, while the lower part of the intermediate hit 2 When the engagement groove 14 facing upward is formed into the engagement groove 14 facing upward, after the horizontal shaft 5 of the frame 4 is fitted into the engagement groove of the end hitch 3, the piston rod of the lift cylinder 8 is inserted as appropriate. 9
and the piston rod 29 of the dump cylinder 30
By moving forward and backward, the frame 4 rotates about the horizontal shaft 5, and the frame 4 engages and disengages the cylindrical body 22 from above into the engagement recess of the intermediate hitch 2, thereby moving the loader b to the tractor in the same manner as above. It can be attached and detached.

FIG. 5 shows a second embodiment in which the loader b of this invention is a front loader, and its structure will be explained with reference to the drawings.
is fixed to the center of the lower front end of the vehicle body 1 of the tractor a.

Therefore, in this structure as well, the direction of the tractor a is reversed from that in the first embodiment,
When removing loader b from tractor a, tractor a is moved backward, and when attaching loader b to tractor a, tractor a is moved forward and operated in the same manner as in the first embodiment. As a result, loader b is attached to and detached from tractor a.

6 and 7 show a second embodiment of the device for attaching loader b to intermediate hitch 2 of tractor a in the first embodiment, and its structure will be explained with reference to the drawings. 2a is an intermediate hit; An engagement groove 14a extending obliquely backward and downward is provided in the middle lower part, and a pin hole 15a is bored at the tip of the upper and lower pieces in a direction substantially perpendicular to the engagement groove 14a. 7a is a locking pin, and a locking spring 32 is attached to the base end of the locking pin. Reference numeral 4a denotes a frame of the loader b, and the lower end of the frame is bifurcated to horizontally support the shaft rod 22a.

Even in this structure, when removing the loader b from the tractor a, from the state shown in FIG. After the piston rod 9 of the cylinder 8 is advanced to press the shaft rod 22a into the groove 14a, the locking pin 7a is pulled out from the pin hole 15a against the elasticity of the locking spring 32.
Since the loader 4a is released, the loader b is separated from the tractor a by performing the same operation as in the first embodiment.

On the other hand, when attaching the loader b to the tractor a, the same operation as in the first embodiment is performed so that the shaft rod 22a of the frame 4a is aligned with the groove 1 as shown in FIG.
4a, the locking pin 7a is inserted into the locking spring 3.
If it is inserted into the pin hole 15a against the elastic force of 2,
The locking spring 32 engages with the upper piece of the intermediate hit 2a, the locking pin 7a is inserted and fixed into the pin hole 15a, and the shaft rod 22a is connected to the intermediate hit 2a and the locking pin 7a.
The loader b is attached to the tractor a by being held in the groove 14a and fitting into the groove 14a.

8 and 9 show a third embodiment of the device for attaching the loader b to the intermediate hitch 2 of the tractor a in the first embodiment, and its structure will be explained with reference to the drawings. 2b is the intermediate hit; An engagement groove 14a extending obliquely backward and downward is provided at the middle lower part thereof, and upper and lower bearings 33 are disposed above the engagement groove 14a in a direction substantially perpendicular to the engagement groove 14a. A stepped portion 34 is formed with the step portion 34 recessed, and a hook portion 35 is provided protrudingly on one side of the stepped portion 34. 7b is bearing 33,3
With a stop pin loosely fitted between the bearings 33 and 33, the upper end is bent backward to form the operating piece 36, and a projecting piece 37 is fixed to one side between the bearings 33 and 33, and a stop pin 7b is fitted between the bearings 33 and 33. The upper end of the spring 32b is latched to the upper bearing 33 and the lower end is latched to the protruding piece 37 by interposing the combined spring 32b, and the protruding piece 37 of the stop pin 7b is latched to the lower bearing 33 by the pushing force of the spring 32b. The tip end enters the pin hole 15b of the lower piece of the intermediate hitch 2b. Note that when the stop pin 7b is lifted and its protrusion 37 is hooked on the hook 35, the concave groove 14 of the stop pin 7b
The inward plunge length a is made larger than the height of the hooking part 35.

Even in this structure, when removing the loader b from the tractor a, the locking pin 7b is moved from the spring 3 by the operation piece 36 from the state shown in FIG.
2b and pull it up against the pushing force of the spring 37 until the protruding piece 37 reaches above the hooking part 35.
When the operating piece 36 is lowered toward one side by twisting b, and the protruding piece 37 is brought into contact with the stepped portion 34 and released, the protruding piece 37 will absorb the pushing force of the spring 32b as shown in FIG. and the latching part 35 due to torsional reaction force.
The tip of the stop pin 7b slightly protrudes into the groove 14a and is fixed, and the groove 14a is opened. Therefore, after that, when the same operation as in the first embodiment is performed, as the shaft rod 22a of the loader b moves backward in the groove 14a, the shaft rod 22a slides onto the tip of the stop pin 7b, and the shaft rod 22a slides onto the tip of the stop pin 7b. rises against the pushing force of the spring 32b, and the shaft rod 22
When the middle part of the pin 7b is joined to the stop pin 7b, the protruding piece 37 of the stop pin 7b comes off above the hook 35, so the stop pin 7b is rotated in the opposite direction due to the torsional reaction force of the spring 32b. The operating piece 36 and the protruding piece 37 return to the state shown in FIG. Then, the shaft rod 22a passes through the stop pin 7b and is removed from the groove 14a, so that the loader b is separated from the tractor a. Note that when the shaft rod 22a passes through the stop pin 7b, the stop pin 7b descends due to the pushing force of the spring 32b, and its tip enters into the pin hole 15b, and the protrusion 37 hits the lower bearing 33, causing the stop pin 7b to descend. The state returns to the state shown in FIG.

On the other hand, when attaching loader b to tractor a, the fixing pin 7b is pulled up with the operating piece 36 and rotated in the same way as when removing the loader b from the lowered state as shown in FIG. The protrusion 37 is moved and released, and the protrusion 37 is hooked onto the hook 35 as shown in FIG. Therefore, by operating the same way as in the first embodiment, the shaft rod 22a of loader b
After it fits into the groove 14a, the shaft 22a hits the tip of the stop pin 7b, and then the shaft 22a slides on the stop pin 7b in the same way as above, and the shaft 22a moves inside the groove 14a. When the shaft moves forward and the middle part of the shaft rod 22a joins the stop pin 7b, the projection 37 of the stop pin 7b comes off the hook 35 upwards, and the stop pin 7b rotates due to the torsional reaction force of the spring 32b. When the operation piece 36 and the protruding piece 37 return to the state facing in the direction shown in FIG. The shaft rod 22a returns to its original state as shown in FIG.
The loader b is held by the loader b and fitted into the groove 14a, and the loader b is automatically attached to the tractor a.

(Effects of the invention) This invention has the following remarkable effects because the loader attaching/detaching device to the tractor is configured as described above.

(1) An intermediate hitch for a loader that has engagement recesses that go downward on both middle sides of the lower part of the tractor body, and a loader that has an engagement groove that goes diagonally outward and upward at the center of the rear end or front end. Attach the end hits for the loader, and insert the horizontal axis of the middle part of the lower piece of the loader's L-shaped frame, whose lower end bends upward, into the engagement groove of the end hitch, and insert the lower end of the lower end on both sides of the The shaft rods are fitted into the engagement recesses of the intermediate hits on both sides, and the above shaft rods are removably fixed to the intermediate hits with fixing pins, and the loader frame is directly attached to the intermediate hits and end hits. (a) By raising the lift arm using the pressure oil that operates the loader, the work equipment at the end of the lift arm and other parts such as the loader's lift arm can be lifted. Since the weight is used to align the pin holes for fixing the loader,
Mounting the loader on the tractor is easy and reliable.

(b) Force can also be applied to the loader in the downward direction, increasing versatility and improving work efficiency.

(c) A loader hitch can be permanently installed on the tractor body without the tractor's three-point hitch getting in the way, and the hitch will not interfere with the running of the tractor or other tasks using the tractor. There is no.

(d) The loader can be attached to and removed from the front or rear of the tractor.

(E) Since the distance between the intermediate hitch and the end hitch is wide, the mounting pitch of the loader to the tractor can be increased, and the frame also serves as a reinforcing member for the tractor, making it possible to work by attaching heavy-loaded working implements to the loader. .

(f) The center of gravity of the machine is lower, resulting in better stability.

(g) It is not easily influenced by the individual characteristics of the tractor, and it is easy to use common loader parts.

(h) The ground height of the loader can be lowered,
When lifting heavy objects in muddy areas, the bottom of the shaped frame can be used like an outrigger to prevent the machine from sinking into the ground or tipping over.

(2) When the loader is not in use, the entire loader comes off from the tractor, which is beneficial for the use of the tractor.

(3) The structure is simple and can be manufactured easily and inexpensively.

[Brief explanation of drawings]

FIG. 1 is a side view of a loader according to a first embodiment of the invention attached to the rear of a tractor, with one wheel of the tractor removed. FIG. 2 is a side view of the loader removed from the tractor, with one wheel of the tractor removed. Figure 3 is the first
Figure 4 is an exploded perspective view of one side of the loader's frame tip attachment part, and Figure 5 is a loader according to the second embodiment of this invention installed in the front of the tractor. State side view, 6th
The figure is a side view showing a second embodiment of the loader attachment part to the intermediate hit of the tractor, FIG. 7 is an exploded slope view, and FIG. 8 is a third embodiment of the loader attachment part to the intermediate hit of the tractor. FIG. 9 is a side view showing the state immediately before the loader is attached to the intermediate hitch of the tractor. a...Tractor, b...Loader, 1...Vehicle body,
2... Middle hitch, 3... End hitch, 4...
shaped frame, 5...horizontal shaft, 6...engaging groove, 7...
...stopping pin.

Claims (1)

[Scope of utility model registration request] An intermediate hitch for loaders is provided with engagement recesses that go downward on both middle sides of the lower part of the tractor body, and an engagement groove for loaders that is provided with an engagement groove that goes diagonally outward and upward at the center of the rear or front end. Attach the end hits of the L-shaped frame of the loader, bend the tip of the lower piece of the loader's L-shaped frame upward, fix shaft rods to both sides of the tip of the lower piece, and construct a horizontal shaft in the middle part. The horizontal shaft of the middle part of the lower piece of the L-shaped frame is removably fitted into the engagement groove of the end hit, and the shaft rods on both sides of the tip of the lower piece of the L-shaped frame are engaged with the intermediate hits on both sides. A loader attachment/detachment device for a tractor, which is detachably fitted into a recess and is detachably fixed by a retaining pin that inserts the intermediate hitch and the shaft rod into the pin hole.