JPH066013U - One-touch hitch structure that connects the tractor and work implement - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To reduce the frequency of pre-operation by half in a one-touch hitch with an automatic connection mechanism that connects a tractor and a work implement. [Structure] An action member 3 which is rotatable by inserting a shaft 2 provided in a fixed member 1 fixed to a working machine B side, penetrates a support frame 4 provided on one surface of the action member 3 and an insertion hole of the action member 3. When the connecting pin can be connected to the engaging pin 7, the tip of the engaging pin 7 can be connected to the engaging pin 7 by a motion that always directs the acting member 3 to the outside with the engaged spring. A locking hole into which the locking pin 7 can be inserted is formed in the fixing member 1 with which the surface abuts, and a stopper 12 for maintaining the pulled-out state in which the locking pin 7 cannot be fitted into the locking hole is fixed to the fixing member 1. A hooking portion provided on a notch formed in a part of the support frame 4 through a gripping part 8 from a part of the locking pin 7,
The locking pin 7 is configured to be hooked so as to maintain the pulled-out state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to the structure of a one-touch hitch that connects a tractor and a work implement.

[0002]

[Technical background]

 The connecting mechanism between the lower link on the tractor side and the work implement is manually tightened with bolts and nuts, and the lower mechanism on the tractor side is hydraulically raised to the chuck mechanism attached to the work implement side so that the chuck mechanism does not bite. There are two types: mechanical type.

[0003]

[Prior art]

 Of the two types of connecting means described above, the latter mechanical type is commonly called a one-touch hitch, and when the disconnection operation is performed from the connected state, the lock pin is manually released and the lower link is hydraulically operated to release it from the device. Then, when this disengagement operation was completed, the lock pin was returned to its original position, and preparations for accepting the lower link were made.

[0004]

[Problems to be solved by the device]

 As described above, in the so-called "one-touch hitch" device of mechanical attachment / detachment device, the previous operation is performed each time "wearing" and "dismounting", and the operation is performed twice for convenience. However, by reducing the amount of manual operation twice and unlocking only by disconnecting, the unlocked state is mechanically maintained until the next connection, and the number of manual operations is reduced by half. , Is intended to reduce the annoyance.

[0005]

[Means for Solving the Problems]

 As a means for achieving the above-mentioned object, the present invention comprises a work machine towed by a tractor, two lower links provided on the tractor side, and a hitch unit for automatically connecting the work machine side. Then, an engaging groove and a locking groove into which the connecting portion of the connecting rod connecting the two lower links can be inserted and engaged are provided by opening on one side of the fixing member and the acting member. When the outermost end of the connecting rod contacts the outer circumference of the connecting part, which is close to the entire circumference, the hitch unit is inserted through the shaft provided on the fixing member that is fixed to the working machine side so that it can rotate. A locking pin that penetrates through the support frame provided on one side of the member and the insertion hole of the acting member is applied to the member by a spring that is engaged so that the locking pin has a motion that always directs the outside of the acting member. , When the connecting rod can be connected , A locking hole into which the locking pin can be inserted is formed in the fixing member with which the tip end surface of the engaging pin abuts, and a stopper that maintains the pulled-out state in which the locking pin cannot fit is fixed to this locking hole. In addition to being provided on the member, a hooking portion provided at a notch formed in a part of the support frame via a gripping portion from a part of the locking pin is used to maintain the pulled-out state of the locking pin. It can be stopped.

[0006]

[Action]

 First, the action of moving from the connected state to the detaching action will be described.

The fixing member and the acting member constituting the hitch unit are rotatably brought together by a single shaft so as to be brought into contact with each other, and engage with the engaging grooves and locking grooves of the substantially inverted U-shape to hook them. The connecting rod is supported by the directions of the openings of the engaging groove and the locking groove being different.

Both of the above-mentioned fixing members are fixed by locking pins so that the connecting rods locked by these fixing members and acting members cannot be separated.

The locking pin is mounted on the working member side so as to be allowed to rotate and move in the axial direction, and the locking pin of the fixed member is in contact with the outside of the working member by the elastic force of the interposed spring. The fixed member and the acting member are kept stationary by being fitted to each other.

The above is connected to the connecting rod that connects the rear ends of the two lower links that are installed in parallel horizontally from the rear of the tractor side, and the hitch unit mounted on the work machine towed by the tractor. It is in a state of being.

[0011] Therefore, to the extent that the locking pin resists the elastic force of the interposed spring and is rotated and pulled out from the fixing member, its tip surface does not completely deviate from the insertion hole of the acting member ( The contraction limit dimension of the spring is set to the set movable distance.), And the latching hook at the tip of the gripping portion of the locking pin is engaged with the stopper projecting toward the operating member side on the upper side of the fixing member. is there.

At this stage, the acting member is no longer rotatable about the shaft with respect to the fixed member.

Therefore, when the lower link side connecting rod is operated to descend, the action member is guided by this operation to rotate, and the opening portions of the engaging groove and the locking groove supporting the connecting rod are opened. In unison, the connecting rod can be disengaged from the hitch unit.

On the other hand, in the hitch unit, with the rotation of the action member, the latching hook portion previously engaged with the stopper is released from the stopper by the rotation, and the locking pin is placed on the support frame. Roll around.

The hooking portion on the support frame engages with a U-shaped notch formed in the upper surface of the support frame, and is pressed against a corner of the notch by a moving action of the spring. Stop.

In the above state, the tip of the locking pin and the outer surface of the operating member are flush with each other.

In this way, the hitch unit keeps the connecting rod in the state in which the connecting rod is disengaged from the hitch unit, and the openings of the engaging grooves and the engaging grooves with which the connecting rod is engaged are exposed. The opening has been expanded so that the connection is good, so that the connecting rod can be immediately received at any time.

If the connecting rod on the lower link side rises again and is inserted through the openings of the engaging groove and the locking groove in the hitch unit, and if the raising action is further continued, Since the mating groove and the locking groove are provided in different directions, the engaging groove of the fixing member is set to the reference position as the connecting rod moves upward, and the locking groove of the acting member rotates accordingly. When the action member rotates according to the engagement depth of the connecting rod, the latching hook of the locking pin, which has been locked in the notch of the support frame, rotates from behind. It is pushed by the stopper on the member side and comes out of the notch that was locked, allowing unlimited movement.

In this way, the tip of the locking pin, which tends to move by the elastic force of the spring, acts so as to project from the outer surface of the acting member, and abuts and slides on the side surface of the fixing member.

When the connecting rod reaches the innermost ends of the engaging groove and the engaging groove, the tip of the engaging pin is aligned with the engaging hole of the fixing member, and the forward action of the elastic force of the spring is applied. The fixed member and the acting member are fitted and inserted into the matching hook holes to complete the immobile state.

When the fixing member and the acting member are united with each other and the immovable state is formed in this way, the engaging rod and the engaging groove have different groove directions. It is impossible to escape from.

[0022]

【Example】

 Next, the embodiment of the present invention will be described with reference to the drawings. The hitch unit A includes a fixed member 1 fixed to a working machine (both not shown) pulled by a tractor, and a shaft 2 attached to the fixed member 1. The action member 3 is rotatably pivoted.

Both the fixing member 1 and the acting member 3 are made of steel plates, and a supporting frame 4 is provided on one surface of the latter acting member 3, and the supporting frame 4 and the acting member 3 are perforated. The locking pin 7 is inserted into the insertion hole 6 so as to be movable back and forth in the axial direction and rotatable, and in the support frame 4, a part of the locking pin 7 and the inner surface of the operating member 3 are inserted. A spring 10 that extends in between is surrounded, and the tip of the locking pin 7 always urges a projecting action that points toward the outside of the acting member 3, and also supports against the elastic force of the spring 10. A contraction limit is set so that the tip of the locking pin 7 and the outer surface of the action member 3 are submerged inward from the flush position and are not deviated from the insertion hole 6 when inserted into the frame 4 side.

On the other hand, one top link projecting rearward from the rear end of the tractor and two lower links 16 are arranged so that the end positions are vertical and the shape is an isosceles triangle with the top link as an apex. The connecting rod 15 is attached so as to connect between the two lower links 16 arranged in parallel so as to form the bottom side thereof.

At the position where the shaft-shaped connecting portion 15a near the both ends of the connecting rod 15 is connected to the hitch unit A of the present invention, a substantially U-shaped engagement with which a half circumference of the connecting portion 15a can be engaged. The fitting groove 13 and the locking groove 14 are relatively widened on one side of the fixed member 1 and the acting member 3, and opening portions 13a and 14a for exerting an accepting action are opened. Particularly, the fixing member 1 is pivotally attached to the fixing member 1 by the shaft 2. The opening 14a of the locking groove 14 in the actuated member 3 is arranged so that the locus of the actuating member 3 at the time of rotation coincides with the engaging groove 13 of the fixed member 1 and the innermost half of both of them. When the ends of the circles are aligned with each other, it is formed so as to be able to come into contact with most of the outer circumference of the connecting portion 15a of the connecting rod 15, and the opening portions 13a and 14a of the connecting rods 15 open in different directions. To do.

As described above, when the innermost portions of the engagement groove 13 and the locking groove 14 are in the matched state, the hook hole 11 penetrating the fixing member 1 is formed at the tip-directed position of the pin 7, It is intended to keep the above state fixed.

Further, a stopper 12 is provided on one side of the fixing member 1 so as to project toward the action member 3 side, and is formed as a part of the locking pin 7 pulled out from the locking hole 11 of the fixing member 1. It is provided so that the hooking hook portion 9 at the tip end of 8 may come into contact with the locking pin 7 so that the locking pin 7 does not communicate with the locking hole 11 of the fixing member 1.

Further, a substantially U-shaped cutout portion 5 is provided in a part of the upper side of the support frame 4, and the hooking hook portion 9 is provided in order to maintain the pulled-out state of the locking pin 7. The engaging hook portion 9 is engaged with one corner portion of the cutout portion 5 in a pressed state by the elastic force of the spring 10 during the engagement.

In the figure, reference numeral 17 is a mounting hole of the fixing member 1 provided for mounting on the working machine B side.

[0030]

[Effect of device]

 This invention is configured as described above, and the detaching operation of the tractor and the working machine can be performed only once when the detaching operation is performed, and the unlocked state is maintained until the next connection is made. This is a state, and since these attachment / detachment operations have been halved from the amount of previous operation work, the attachment / detachment operations can be simplified and the accidents that can occur with the work can be halved. There is an effect that can be done.

[0031]

[Brief description of drawings]

1 is a side view of the entire apparatus, FIG. 2 is a front view of FIG. 1, and FIG.
4 is a front view of the end of the connecting rod, FIG. 4 is a side view of the fixing member, FIG. 5 is a front view of FIG. 4, FIG. 6 is a side view of the action member, FIG. 7 is a front view of FIG. 6, and FIG. It is a perspective view of a stop pin.

[0032]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixing member 2 Shaft 3 Action member 4 Support frame 5 Notch 6 Insertion hole 7 Locking pin 8 Gripping 9 Locking hook 10 Spring 11 Locking hole 12 Stopper 13 Engaging groove 13a Opening 14 Locking groove 14a Opening Part 15 Connecting rod 15a Connecting part 16 Lower link 17 Mounting hole A Hitch unit B Working machine

Claims (1)

[Scope of utility model registration request] 1. A work machine B towed by a tractor, and two lower links 16 provided on the tractor side.
In the hitch unit A for automatic connection on the working machine B side, the engaging groove 13 and the engaging groove 14 into which the connecting portion 15a of the connecting rod 15 connecting the two lower links 16 can be inserted and engaged are fixed members. 1 and the action member 3 are opened to one side, and the time point at which the outermost ends of the engaging groove 13 and the locking groove 14 contact the outer periphery of the connecting portion 15a of the connecting rod 15 close to almost the entire circumference, the hitch unit. In A, the working member 3 is rotatably inserted through the shaft 2 provided in the fixed member 1 fixed to the working machine B side, the support frame 4 provided on one surface thereof and the insertion hole 6 of the working member 3. When the engaging pin 7 is passed through, the engaging spring 7 gives the engaging pin 7 a motion that always directs the action member 3 to the outside, so that the connecting pin 15 can be connected. The locking pin 7 is inserted into the fixing member 1 with which the front end surface of the A locking hole 11 is provided, and a stopper 12 for maintaining the pulled-out state in which the locking pin 7 cannot be fitted in the locking hole 11 is provided in the fixing member 1, and a recess is provided in a part of the support frame 4. The hooking portion 9 provided in the cutout portion 5 from a part of the locking pin 7 via the grip portion 8 can be locked so as to maintain the pulled-out state of the locking pin 7. A one-touch hitch structure that connects the tractor and the work machine.