JPH044052Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is a front part that is connected and supported approximately at the middle part and the front part of a traveling machine such as a tractor, and is used for loading compost, earth and sand, etc., and for leveling fields. The present invention relates to a loader mounting device. ``Prior Art'' Conventionally, as shown in Japanese Utility Model Application Publication No. 57-160349, a lift arm to which a bucket is attached, a side frame to which a front support leg is attached, and a hydraulic cylinder for raising and lowering the lift arm are connected to a rotating fulcrum frame. At the same time, a technology was developed to connect the base end of the rotation fulcrum frame to the machine.

"Problems to be Solved by the Invention" The above-mentioned prior art was provided with a locking member that engaged the rotation fulcrum frame with the machine, but since the locking member was pressed by a spring, when the spring force was strong, However, there were safety and functional problems such as the rotation fulcrum frame not being able to be easily engaged and disengaged, and the attachment of the rotation fulcrum frame becoming unstable when the spring force was weak.

Therefore, as shown in Utility Model Application Publication No. 58-120260,
A technique has been developed to provide a lock lever to fix the rotation fulcrum frame to the machine, but the rotation fulcrum frame needs to be connected to the machine at two places, the upper and lower, and the lock lever has to be manually engaged, etc. There were structural and handling problems.

``Means for solving the problem'' However, the present invention is designed to connect and fix the base end of the rotation fulcrum frame, which supports the lift arm so as to be able to swing up and down, from above to the receiving plate of the base stand on the machine side. Attaching a cam body that fixes the rotation fulcrum frame to the receiving plate in conjunction with the falling movement of the rotation fulcrum frame, and fixing the cam body to the receiving plate in conjunction with the fixing operation of the rotation fulcrum frame by the cam body. This feature is characterized by the provision of a locking pin.

``Function'' Therefore, the engagement between the rotation fulcrum frame and the cam body, and the engagement between the cam body and the lock pin are automatically performed simply by lowering the rotation fulcrum frame, resulting in instability and safety problems. This eliminates the need for the conventional spring elastic engagement, and also eliminates the need to manually engage the cam body and lock pin, making it easier to improve the functionality of the rotation fulcrum frame support structure and the safety during installation. In addition, the double engagement structure of the cam body and lock pin improves the supporting force of the rotation fulcrum frame, so the lift arm, loader lifting cylinder, and side frame can be stably connected to the rotation fulcrum frame, which has a simple structure. The structure of the rotation fulcrum frame can be simplified and the support function can be improved more easily than in the past, and it can be handled more safely than in the past.

"Embodiment" An embodiment of the present invention will be described in detail below with reference to the drawings. Fig. 1 is an explanatory diagram of the operating state of the front loader, Fig. 2 is an overall side view, and Fig. 3 is a plan view of the same.
are the front and rear wheels of the tractor 1, 4 is a chassis that is a machine base on which the front wheels 2 are mounted, 5 is an engine mounted on the chassis 4, and 6 is a power transmission connected to the engine 5 and mounted on the rear wheels 3. Case 7 is the case 6 mentioned above.
A driver's seat 8 is a steering handle attached to the rear upper surface of the tractor, and a bucket 10 of a front loader 9 is installed in front of the tractor 1 via a pair of left and right lift arms 11. Further, in the figure, 12 is a rotation fulcrum frame that is a loader mounting frame that supports the lift arm 11, and 13 is the power transmission case 6.
This is a loader rear support base pedestal provided in a protruding manner on both sides of the loader 9, and is configured so that the rear part of the loader 9 is supported by a single base pedestal 13.

As shown in FIGS. 4 and 5, the rotation fulcrum frame 12 has its lower base end connected to the base pedestal 13.
The frame 1 is directly connected removably to the frame 1.
A pin 16 is provided at the upper end of the frame 12 to connect and support the base end of the lift arm 11 via a rotation fulcrum pin 14, and between a substantially intermediate portion of the frame 12 and a fixed locking plate 15 in the middle of the lift arm 11. A loader elevating cylinder 18 is interposed via a loader elevating cylinder 17, and the lift arm 11 is appropriately moved up and down by the expansion and contraction operation of the cylinder 18.

Further, each swing pin 21, 2 is attached to the fixing bracket 19, 20 at the middle and front end of the lift arm 11.
2 to support the base ends of the dump cylinder 23 and the dump arm 24, and connect the cylinder 23 and the tip of the arm to each other via a pin 25, and connect the tip of the arm 24 to the rear upper end of the bucket 10. They are interlocked and connected via pins 26, 27 and a dump link 28. The rear lower end of the bucket 10 is supported by a fixed mounting plate 29 at the tip of the lift arm 11 via a pin 30, and the tilt of the bucket 10 is appropriately varied by the expansion and contraction of the dump cylinder 23. There is.

As shown in FIGS. 5 to 8, the rear ends of left and right side frames 31 are integrally fixed in the middle of the rotation fulcrum frame 12, and left and right supporting leg holding frames are attached to the tips of the frames 31 via brackets 32. 33 are integrally fixed. There are three bolts 34 inside the left and right support leg holding frames 33.
The left and right supporting leg frames 35 are integrally connected via a, 34b, and 34c, and the upper ends of the supporting leg frames 35 are integrally fixed with a protection rod 36 that is a protector, and the holding rod 37 that is a tie bar is connected between the lower ends of the supporting leg frames 35. A reinforcing member 38 is integrally fixed from below the protection rod 36 on the inner surface of the supporting leg frame 35 to the middle of the frame 35 to improve its strength. That is, the connecting portion of the side frame 31 to be connected to the traveling body 1 is integrally formed into a square frame shape by the left and right supporting leg frames 35, 35 and the respective rods 36, 37 that connect these to each other. In addition, the lower end of the frame 35 is turned outward
A supporting leg 39 is formed by bending it into a shape, a bracket 40 is integrally fixed to the front side of the supporting leg 39, and an auxiliary supporting leg 42 for extending the stand is detachably attached to the bracket 40 via a mounting bolt 41. It consists of

As shown in FIGS. 9 to 11, the chassis 4
A front bumper 43 is integrally fixed to the front end of the loader 9, and the bumper 43 is provided with a loader front holding device 44, which is a front support member of the loader 9 and holds the support leg frame 35 at an upper position. The holding device 44 has the holding rod 37 at the bottom.
a loader holding box 46 forming a notch 45 into which the loader is inserted; and a cam body 49 that is swingably attached to the box 46 via a shaft 47 so that an engagement groove 48 with the holding rod 37 faces the notch 45. When the cam body 49 engages and holds the holding rod 37 by supporting the stopper receiving plate 50 in the box 46 via the compression spring 51, the concave portion of the receiving plate 50 is moved by the spring force of the compression spring 51. 50a and a stopper 52 which is a cam body positioning member that engages with the recess 49a of the cam body 49 to position the cam body 49.
When one end is fixed to the stopper 52 and the other end is projected to the outside of the box 46 through the loose fitting hole 53, the stopper 52 is retreated against the spring 51 and positioned at the upper surface position 50b of the stopper receiving plate 50. A release lever 54 is formed to release the position of the stopper 52 with respect to the cam body 49, and a connecting plate 5 connects the rear and front portions of the left and right holding boxes 46, 46 to each other.
5 and 56, and a reinforcing plate 57 connects the center of these connecting plates 55 and 56, and a rear connecting plate 55 is removably fixed and supported on the front bumper 43 via bolts 58. A balance weight 59 is appropriately fitted and supported on the connecting plate 56, and the front loader 9
A reinforcing bracket 60 fixed to the back surface of the box 46 and the connecting plate 55 is removably attached to the outer surface of the chassis 4 via bolts 61 to maintain the weight balance when the holding device is installed. The support strength of 44 is improved.

As shown in FIGS. 6 and 12, a pair of left and right fixing brackets 62 are attached to the lower end of the rotation fulcrum frame 12, which supports the base end of the lift arm 11, the tip of the lifting cylinder 18, and the base end of the side frame 31, respectively. , 62, and open portions 62a, 62 at the bottom of the brackets 62, 62 that are bent more on the rear side than on the front side.
a, and is configured so that it can be engaged and fixed to a loader rear holding device, which will be described later, with sufficient margin.

On the other hand, as shown in FIGS. 13 and 14, a rotation fulcrum frame 12 is mounted on the upper surface of the rear support base 13.
A loader rear holding device 64 is provided as a rear support member of the loader 9 for holding the loader 9 upright. The holding device 64 is erected and fixed on the upper surface of the base 13 and is integrally connected with connecting plates 65 and 66, and has a locking groove 67 on the front upper surface into which the engaging pin 63 is fitted.
A pair of left and right receiving plates 68, 68 forming vertically
The engagement groove 71 with the locking pin 63 is swingably attached between the receiving plates 68, 68 via a fulcrum pin 70 pivotally supported on the boss portions 69, 69 of the receiving plates 68, 68.
a cam body 72 which faces the locking groove 67; and when the cam body 72 engages and holds the engagement pin 63, the spring force of the compression spring 73 causes the receiving plates 68, 6 to
A lock pin retaining groove 75 and a cam body 72 formed at the tip of an inclined guide groove 74 extending forward and downward from the rear surface of 8.
A lock pin 77 is a cam body position holding member that engages with a lock pin engagement groove 76 to maintain the position of the cam body 72, and one end is fixed to the lock pin 77 and a grip bar 78 is horizontally fixed to the other end. At the same time,
The lever support portions 68a, 68a, which are formed by projecting the intermediate portions above the rear portions of the receiving plates 68, 68, are vertically movable within a lever swing cylinder 80 which is rotatably fixed via a lever swing fulcrum pin 79 to the outside of the lever support portions 68a, 68a. The lock pin 77 is inserted into the guide groove 7 against the spring 73.
4 and a release lever 81 that releases the position of the cam body 72 when it is taken out from the support plate 68 and positioned on the rear outside of the receiving plates 68, 68.
The engagement pin 63 at the lower end is connected to the receiving plate 6 by the cam body 72.
8, 68 to engage and fix the fulcrum frame 12.
is configured to be directly connected and fixed to the base 13.

As is clear from the above, the rotation fulcrum frame 12 supports the lift arm 11 so as to be able to swing up and down.
A cam body 72 is attached to the receiving plate 68 of the base 13 on the machine side, which connects and fixes the base end, and fixes the rotating fulcrum frame 12 to the receiving plate 68 in conjunction with the downward movement of the rotating fulcrum frame 12 from above. At the same time, the rotation fulcrum frame 12 by the cam body 72
A lock pin 77 is provided to fix the cam body 72 to the receiving plate 68 in conjunction with the fixing operation of the rotating fulcrum frame 12. The cam body 72 is automatically engaged with the cam body 72, and the lock pin 77 is automatically engaged with the cam body 72.
The base end is fixed to the base 13.

The present invention is constructed as described above, and the lifting cylinder 18 is actuated to raise and lower the lift arm 11 around the fulcrum pin 14 to lift the bucket 10, and the dump cylinder 23 is actuated to raise and lower the lift arm 11 around the fulcrum pin 14.
Rock the bucket 10 back and forth around 0,
When the tractor 1 is reciprocated back and forth, scooping and loading of compost, earth, etc. is performed, and when the bucket 10 is grounded and the tractor 1 is moved backward, the field leveling work is performed using the bucket 10.

When installing the front roller 9 on the tractor 1, the tractor 1 is moved to the rear of the loader 9 supported by the bucket 10 and the supporting legs 39, and the lifting cylinder 18 is reduced, as shown in FIG. When the lift arm 11 is moved, the rear end of the lift arm 11 is lowered, and the rotation fulcrum frame 12 is also lowered. During this lowering, the fixed brackets 62, 62 are located outside the receiving plates 68, 68, and the engagement pin 6
3 is engaged and fixed to the receiving plates 68, 68 by the cam body 72, and the rotation fulcrum frame 12 is directly connected and fixed to the loader rear holding device 64. That is, the first
As shown in FIG.
When moving the upper part downward, the claw part 7 on the lower side of the engagement groove 71
2a and rotates the cam body 72 counterclockwise around the fulcrum pin 70. When the engagement pin 63 moves into the engagement groove 67 formed at the end of the slide surface 68c, the engagement pin 63
The engagement groove 71 of the cam body 72 is fitted from above, and the lock pin engagement groove 75 of the receiving plates 68, 68 is fitted into the engagement groove 71 of the cam body 72 from above.
When the lock pin engagement groove 76 of the cam body 72 is aligned with the lock pin 77, the force of the spring 73 moves the lock pin 77 toward the lower end of the guide groove 74 and fits into each groove 75, 76, as shown in FIG. The cam body 72 is held in position by the receiving plates 68, 68.
The engagement pin 63 is engaged and fixed between the engagement grooves 67, 67 of the cam body 72 and the engagement groove 71 of the cam body 72. After this, when the cylinder 18 is further reduced, the fourth
As shown in the figure, the rotation fulcrum frame 12 rises to a substantially upright state around the pin 63, and the supporting leg frame 35 is lifted up via the side frame 31, and the holding rod 37 of the frame 35 engages with the holding box 46. is maintained. That is, as shown in FIG.
When the cam body 49 is moved upwardly, the holding rod 37 is attached to one claw portion 49b of the cam body 49 that is formed across the engagement groove 48.
contact and rotate the cam body 49 clockwise about the shaft 47. Then, the cam body 49
2, the stopper 52 is moved backward against the compression spring 51, and when the recess 49a of the cam body 49 is aligned with the position of the stopper 52, the first
As shown in FIG. 0, the force of the spring 51 returns the stopper 52 to position the cam body 49, and the holding rod 37 is engaged and held between the notch 45 and the engagement groove 48 of the cam body 49. do. As a result, the supporting leg frame 35 and the supporting leg 39 are retracted, and at the same time, the rotation fulcrum frame 12 is also fixed in position, and from this point on, only the lift arm 11 moves up and down as the cylinder 18 expands and contracts. .

On the other hand, when removing the front loader 9 from the tractor 1, the stopper 52 is moved back by operating the release lever 54 and held at the upper surface position 50b of the receiving plate 50, as shown by the imaginary line in FIG. The restriction of the holding rod 37 by the cam body 49 is released, and in this state, contrary to the above, the cylinder 18 is
By extending the support leg 39, the support leg 39 is grounded again. After this, as shown by the imaginary line in Fig. 13,
By operating the other release lever 81, the lock pin 77 is taken out from the guide groove 74 to the rear side of the receiving plates 68, 68, the restriction of the engagement pin 63 by the cam body 72 is released, and the cylinder 18 is further extended. By doing so, the rotation fulcrum frame 12 is released upward from the loader rear holding device 64, and the tractor 1 and the front loader 9 are separated from each other.

As described above, in this embodiment, the front loader 9 can be firmly and safely supported by the bucket belt 10 and the supporting legs 39, and the single lifting cylinder 18 can be effectively used when attaching to and detaching from the main body of the tractor 1. At the same time, the loader holding devices 44 and 64 provided at the front and approximately intermediate portions of the tractor 1 allow one worker to automatically and easily attach and detach the loader without bothering other workers. It can be done. Furthermore, the engagement pin 63 at the lower end of the rotation fulcrum frame 12 and the engagement groove 71 of the cam body 72 can be seen directly by the operator operating the tractor 1, and the engagement and fixation of these can be quickly performed. The cam body 72 does not obstruct the forward view of the traveling body 1 when the loader 9 is removed.

"Effects of the Invention" As is clear from the above embodiments, the present invention provides a support plate of the base 13 on the machine side that connects and fixes the base end of the rotation fulcrum frame 12 that supports the lift arm 11 so as to be able to swing up and down. A cam body 72 is attached to 68 to fix the rotation fulcrum frame 12 to the receiving plate 68 in conjunction with the dropping operation of the rotation fulcrum frame 12 from above, and the cam body 72 fixes the rotation fulcrum frame 12. A lock pin 77 is provided to fix the cam body 72 to the receiving plate 68 in conjunction with the movement, and the engagement between the rotation fulcrum frame 12 and the cam body 72,
In addition, since the cam body 72 and the lock pin 77 are automatically engaged simply by lowering the rotation fulcrum frame 12, there is no need for the conventional spring force engagement, which is unstable and poses a safety problem. There is no need to manually engage the body 72 and the lock pin 77, and it is possible to improve the functionality of the support structure for the rotation fulcrum frame 12 and the safety during installation more easily than before. Lock pin 77
The double engagement structure improves the supporting force of the rotation fulcrum frame 12, so the lift arm 11, loader lifting cylinder 18, side frame 31, etc. can be stably connected to the rotation fulcrum frame 12 with a simple structure. This makes it easier to simplify the structure of the rotation fulcrum frame 12 and improve its support function than in the past, and it can be handled more safely than in the past.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the operating state of a front loader showing an embodiment of the present invention, FIG. 2 is an overall side view, FIG. 3 is a plan view of the same, FIG. 4 is an enlarged side view of the front loader, and FIG. The figure is an enlarged perspective view of the same, Figure 6 is an explanatory diagram of the installation of the rotation fulcrum frame and the supporting leg frame, Figure 7 is an explanatory diagram of the attachment of the supporting leg frame, Figure 8 is an explanatory diagram of the supporting leg part, and Figure 9 is the front part. A partially enlarged plan view of the holding device part, FIG. 10 is a side view of the same, FIG. 11 is a front view of the same,
Figure 12 is a partially enlarged explanatory diagram of the rotation fulcrum frame;
Fig. 13 is an enlarged side view of the rear holding device section;
15 is an explanatory diagram of the operating state of FIG. 13, and FIG. 16 is an explanatory diagram of the operating state of FIG. 10. 1... Traveling aircraft, 9... Front loader, 10
...Bucket, 11...Lift arm, 12...
Rotating fulcrum frame, 18... Loader elevating cylinder, 31... Side frame, 35... Support leg frame, 49, 72... Cam body.

Claims (1)

[Scope of utility model registration request] The rotation fulcrum frame 12, which supports the lift arm 11 in a vertically swingable manner, connects and fixes the base end of the rotation fulcrum frame 12 to the receiving plate 68 of the base stand 13 on the machine side from above. and a lock pin 77 that fixes the cam body 72 to the receiving plate 68 in conjunction with the fixing operation of the rotating fulcrum frame 12 by the cam body 72. A front loader mounting device characterized by being provided with.