JPS6124597Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lower link of a three-point linkage mechanism for connecting a working machine to a tractor so that it can be raised and lowered.

The three-point link mechanism is attached to the rear of the tractor, and when connecting a working machine, it is necessary to align the rear end of the lower link with the connecting part of the working machine while moving the tractor backwards.

In conventional lower links, the alignment between the rear end and the connection part of the work equipment must be performed extremely carefully, and it is difficult to precisely adjust the position of the tractor or work equipment in the longitudinal direction, making it extremely complicated. It has become a lot of work.

In view of these conventional problems, the present invention has been developed by forming a work machine with two telescopic members that can be automatically locked at a predetermined position and can be unlocked with a single touch. It is an object of the present invention to provide a lower link configured so that connection work with the lower link can be performed extremely easily.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6, the lower link 1 includes two members (first link member 2 and second link member 3) having connecting portions 2a and 3a at one end, and a structure for connecting and fixing both members 2 and 3. It consists of a setting member 4.

The first member 2 has a connecting portion 2a connected to the tractor body via a pin at one end, and a cylindrical shape formed into a rectangular tube by four flat plates 6a, 6b, 6c, and 6d at the other end. A lift rod connecting pin insertion hole 8 for connecting to a lift arm of a hydraulic system of a tractor is formed in the middle of the portion 7.

The second member 3 has a connecting portion 3a connected to the working machine via a pin at one end, and the cylindrical portion 7 at the other end.
An insertion portion 10 is formed to be slidably inserted into the second member 3, and this second member 3 is prepared in the following categories.

A hole 12 is formed approximately in the center of the flat plates 6a and 6b of the cylindrical portion 7 of the first member 2, and a long groove 13 extending in the longitudinal direction is formed in the insertion portion 10 of the second member 3.
A set pin 14 of the set member 4 passes through the hole 12 and the long groove 13.

A retaining disk 15 is welded to the end of the set pin 14, and a knob portion 16 is attached to the outer surface of the retaining disk 15.
, two locking pins 17, 17 are provided protruding from the inner surface, respectively.

A spring 18 and a spring seat 19 are fitted to the other end of the set pin 14 passing through the cylindrical portion 7, and a retaining pin 20 prevents the set pin from coming off. Further, a coil spring 21 is fitted between the retaining disc 15 of the set pin 14 and the cylindrical member 7.

Two stopper pins 24 are implanted on the surface of the flat plate 6a of the cylindrical portion 7, and both stopper pins 24
A hole 25 is formed in the stop disk 15 which can be fitted into the hole 25. The coil spring 21 is attached to one of the locking pins 17
and a stopper pin 24, applying elasticity to rotate the setting member 4 clockwise in FIG.

The setting member 4 can move the set pin 14 in the axial direction against the spring 18 by pinching and pulling the knob portion 16, and the amount of movement thereof is longer than that of the stop pin 24.

That is, the set pin 14 can be pulled out until the engagement between the stopper pin 24 and the hole 25 is released.
In the released state, the knob 16 can be pinched and turned, and the set pin 14 can be attached to the coil spring 2.
It can rotate against 1. When you release the knob 16,
Due to the action of the coil spring 21, the stopper pin 24
and the hole 25, and when they are engaged, the set pin 14 is inserted until the stop disk 15 comes into contact with the cylindrical portion 7 by the action of the spring 18.

The stopper pin 24 and hole 25 provided between the set pin 14 and the cylindrical portion 7 are connected to the set member 4.
The set member 4 is fixed to the set pin 1 by the rotation preventing means.
It can be released by moving and rotating in four axial directions. Further, the spring 18 and the coil spring 21 serve as return means (axial biasing means and circumferential biasing means), and by simply releasing the knob 16, the released setting member 4 can be rotated counterclockwise. Then, the set pin 14 is moved in the opposite direction in the axial direction to return the rotation preventing means to the operating state.

A locking pin 1 is provided on the flat plates 6a and 6b of the cylindrical portion 7.
Circular long holes 27a, 27b for penetrating 7a, 17b
is formed, and the setting member 4 can be rotated within the range in which the locking pins 17a, 17b move within the elongated holes 27a, 27b.

The insertion portion 10 of the second member 3 has a rectangular cross section, and upper and lower surfaces 10a and 10b are inclined surfaces so that the width in the vertical direction is tapered from the middle, and the insertion portion 10 has a cylindrical shape. 7, there is not much play, but the insertion section 10 is inserted into the cylindrical section 7.
In the extended state in which the second member 3 protrudes approximately half way, vertical play occurs.
You can move up and down to match.

As shown in FIG. 5, the long groove 13 formed in the insertion portion 10 has locking recesses 28a and 28b formed at its rear end and intermediate portion. The locking recesses 28a and 28b can be engaged with the locking pins 17a and 17b of the setting member 4 when the insertion portion 10 is in the retracted state, and when the setting member 4 is in the rotation-prevented state by the rotation preventing means. , locking pins 17a, 17b
are engaged with the locking recesses 28a and 28b to prevent relative movement (expansion and contraction) of the set member 4, and thus the first member 2 and the second member 3.

The locking pins 17a, 17b and the locking recess 28
At least one set of a and 28b is sufficient, and these form a locking means for preventing relative movement between the first member 2 and the second member 3, and the activation and release of this locking means is performed by the rotation preventing means. This is done simultaneously, and the two methods are interrelated.

That is, when the rotation preventing means is in the operating state, the locking means is also in the operating state, and if the locking means is not in the operating state, the rotation preventing means is also in the released state. must be canceled.

The linear portion 13a of the long groove 13 other than the locking recesses 28a and 28b serves as a release maintaining means, and while the locking pins 17a and 17b are in contact with this straight portion 13a, the rotation preventing means and locking means are both in the released state and maintained, the first member 2 and the second member 3 are movable relative to each other within the range of the long groove 13, and both members 2 and 3 are expanded and contracted to work with the connecting portion 3a. It can be aligned with the connecting part of the machine. After connecting with the working machine, when the tractor is moved backwards and the first and second members 2 and 3 are contracted,
Locking pins 17a, 17b and locking recesses 28a, 28
b are engaged, the locking means and rotation preventing means are automatically operated, and unless the rotation preventing means is manually released, both members 2 and 3 become an integrally fixed lower link.

Next, the connecting operation in the lower link 1 will be explained.

The connecting part 3a at the rear end of the lower link 1 mounted on the tractor is set at approximately the same height as the connecting part of the working machine, and the tractor is moved backward to move the connecting part 3a close to the working machine connecting part.

Pinch the knob part 16 and set the setting member 4 to the spring 1.
8 to release the engagement between the stopper pin 24 and the hole 25, and then rotate the setting member 4 counterclockwise in FIG. 2 against the coil spring 21. As a result, the locking pins 17a, 17b and the locking recess 28
The engagement between a and 28b is released, and in this state, the second member 3 is advanced from the first member 2. Locking pin 17
a, 17b escape from the locking recesses 28a, 28b and come into contact with the straight portion 13a, the setting member 4 will not return to its original state even if the knob portion 16 is released, and the locking of both members 2, 3 will continue. The released state is maintained.

In the unlocked and maintained state, the second member 3 is expandable and retractable with respect to the first member 2, and even if there is a shift in the front-rear direction from the connecting portion of the working machine, the connecting portion 3a can be connected very easily. Further, the second member 3 can be tilted by the action of the upper and lower surfaces 10a and 10b, and the vertical position of the connecting portion 3a can be adjusted, so that the connecting work can be made easier.

After connecting the work equipment, when the tractor is moved slightly backward, both members 2 and 3 contract, and when the locking pins 17a and 17b match the locking recesses 28a and 28b, the setting member 4 is moved to the second position by the action of the coil spring 21. The set member 4 is rotated clockwise in the figure, and the spring 18 moves the set member 4 in the axial direction of the set pin 14, the stopper pin 24 and the hole 25 engage with each other, the rotation of the set member 4 is prevented, and the first member 2 and the second member 3 are integrally fixed to form one lower link 1.

That is, the lower link 1 is divided into front and rear parts, and has a connecting part 2a connected to one of a tractor and a working machine at one end, and a first part having a cylindrical part 7 at the other end.
The link member 2 and the connecting portion 3a connected to the other of the tractor and the working machine at one end and the cylindrical portion 7 at the other end.
a second link member 3 having an insertion portion 10 telescopically inserted into the cylindrical portion 7 and the insertion portion 10;
The insertion portion 10 has a set member 4 that penetrates through and linearly connects the first and second link members 2 and 3, and a long groove 13 extending in the longitudinal direction is formed in the insertion portion 10. The member 4 includes a stop plate 15 facing the cylindrical part 7, a set pin 14 implanted in the stop plate 15, supported through the cylindrical part 7 and penetrated by the long groove 13, and a set pin 14 parallel to the set pin 14. A locking pin 17 is embedded in the stopper plate 15 and inserted into the long groove 13 through the cylindrical portion 7. An arcuate hole 27a is formed in the long groove 13 of the insertion portion to allow rotation around the set pin 14, and the long groove 13 of the insertion portion allows the insertion portion to rotate around the set pin 14 with the insertion portion 10 accommodated in the cylindrical portion 7. Stop pin 17
An engagement recess 28 is formed in the cylindrical portion 7, and when the locking pin 17 is engaged with the engagement recess 28, the stop plate 15 is engaged and disengaged by the axial movement of the set pin 14. Stopper member 2 for stopping the rotation of the stopper plate
4 is provided between the setting member 4 and the cylindrical portion 7, and a circumferential urging means 21 for urging the setting member 4 in a direction to engage the locking pin 17 in the engagement recess 28. and an axial biasing means 18 for biasing the set member 4 in a direction to engage the stop plate 15 with the stopper member 24.

According to the present invention described in detail above, the stop plate 15 is separated from the stopper member 24 against the axial biasing means 18, and the locking pin 17 is moved into the engagement recess 28 against the circumferential biasing means 21. When the first and second link members 2 and 3 are detached from the road and placed in the long groove 13, the first and second link members 2 and 3 become expandable and contractible, and the length of the lower link 1 can be adjusted to the distance between the tractor and the working machine. When the link members 2 and 3 are contracted by moving the tractor backwards after the link member 3 is connected to the tractor and the working machine, the locking pin 17 is engaged with the engagement recess 28 by the operation of both the biasing means 18 and 21. and stop plate 15
engages with the stopper member 24, and both link members 2,
3 is automatically directly connected to form a single lower link, making it possible to connect the working machine to the tractor extremely easily.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partial cross-sectional plan view of the whole, Fig. 2 is a side view of the main part,
3 is a cross-sectional view taken along the line 1 in FIG. 1, FIG. 4 is a side view of the cylindrical portion, FIG. 5 is a side view of the second member, and FIG. 6 is a plan view of the setting member. DESCRIPTION OF SYMBOLS 1... Lower link, 2... First member, 3... Second member, 4... Set member, 7... Cylindrical part, 10
... Insertion part, 13 ... Long groove, 14 ... Set pin, 15 ... Stopping disc, 17 ... Locking pin, 18
... Spring, 21 ... Coil spring, 24 ... Stopper pin, 28 ... Locking recess.

Claims (1)

[Claims for Utility Model Registration] A first link member 2 having a connecting portion 2a connected to one of a tractor and a working machine at one end and a cylindrical portion 7 at the other end, and a first link member 2 having a connecting portion 2a connected to one of the tractor and the working machine at one end, A second link member 3 having an insertion portion 10 telescopically inserted into the cylindrical portion 7 at the other end of the connecting portion 3a to be connected; 1. A lower link having a set member 4 that linearly connects the second link members 2 and 3, the insertion portion 10 having a long groove 13 along the longitudinal direction.
The setting member 4 has a stop plate 15 facing the cylindrical part 7, and a set pin 14 which is implanted in the stop plate 15, is supported through the cylindrical part 7, and is penetrated by the long groove 13. A locking pin 17 is installed parallel to the set pin 14 on the stop plate 15 and inserted into the long groove 13 through the cylindrical portion 7. An arcuate hole 27a is formed to allow the pin 17 to rotate around the set pin 14 in a penetrating state. An engagement recess 28 is formed in which the locking pin 17 that rotates around the center engages, and the locking pin 17 is inserted into the engagement recess 28 in the cylindrical portion 7.
A stopper member 24 is provided between the set member 4 and the cylindrical portion 7 to prevent the stop plate from rotating when the set plate 15 is engaged with the set pin 14 in the axial direction. The circumferential biasing means 21 biases the set member 4 in a direction in which the locking pin 17 is engaged with the engagement recess 28, and the set member 4 is biased in a direction in which the stop plate 15 is engaged in the stopper member 24. A lower link characterized in that it is provided with an axial direction biasing means 18 for biasing the lower link.