JP5046260B1 - Shank attachment / detachment mechanism - Google Patents

Abstract

An object of the present invention is to fix a shank coupling port of a work machine unit with one touch and to release the fixing.
An opening having a downwardly inclined surface is provided on the rear wall of the shank coupling hole, and a positioning block is slidably fitted therein. A base member fitted with a slidable cam slider is integrally coupled to the shank coupling hole. An intermediate fulcrum of the lock arm is pivotally supported by the bearing of the base member, and the positioning block is pressed by the lock arm to engage with the shank positioning recess in the coupling hole, and the tip of the lock arm is locked to the hook portion. By rotating the lock arm in the reverse direction, the lock is released and the positioning block is retracted from the engagement position, and the coupling of the shank is released. The base member may be provided with an elastic biasing member that presses the cam slider in the slide guide portion. An eccentric bearing ring is provided around the bearing member of the base member, and an elastic O-ring is interposed between the lock lever spindle and the eccentric bearing ring. [Selection] Figure 4

Description

  The present invention relates to a technique for fixing / unfixing an attachment shank to a shank joint opening of a work implement main body bracket so that the position can be freely changed. In particular, the shank is fixed to a shank joint opening provided on a cultivator bracket at a desired position by one touch. The present invention relates to a shank attaching / detaching mechanism that can be fixed and released.

As shown in FIG. 1, an agricultural machine such as a cultivator 11 that performs work on a wide field has a plurality of work units 13 arranged in a row at the rear part of a horizontal bar 12 that is pulled by a tractor or the like to pull the field. While doing various work such as cultivation soil.
As shown in FIG. 2, each work unit 13 is provided with a horizontal shank coupling port 2 on the left and right sides and the rear portion of the bracket 1 fixed to the middle bone beam 14. The horizontal shank 16 of this work attachment is coupled to the lateral position so that the fixed position can be changed, and the working width between the left and right cultivating claws 15, 15 is adjusted according to the size of the crop.
However, in the conventional shank coupling means, a push bolt fitted with a hexagon nut is screwed into a screw hole formed in the rear wall plate of the shank coupling port 2, and a desired position of the shank inserted therein is pressed with the push bolt. After that, since the hexagon nut for preventing loosening is tightened and fixed, the adjustment of the shank action width is complicated. In particular, the connection port 2 of the horizontal shank is provided at a plurality of locations in one unit, and a single cultivator is often used simultaneously or alternately for multiple types of crops having different working widths. The frequency of adjusting the width of the shank connected to the mouth increases. Therefore, the conventional means has enormous time and labor, and has seriously hindered work efficiency.

JP 2010-279276 A

  Accordingly, an object of the present invention is to provide a shank attachment / detachment mechanism that can fix or release a lateral shank of an attachment to a shank connection port of a work unit with one touch.

  In order to achieve this object, the shank attachment / detachment mechanism of the present invention comprises: a shank coupling hole of a bracket for fitting a shank of a work attachment; an opening portion having upper and lower surfaces formed on the rear wall of the shank coupling hole by a downward inclined cut surface; A positioning block that is slidably fitted in the opening and protrudes into and out of the opening; a slide guide portion that extends in a direction perpendicular to the shank coupling hole is provided at the center of the frame, and one end A base member which is provided with bearing members on the left and right sides, and is integrally coupled to the bracket so as to face the positioning block; an intermediate fulcrum shaft of the arm is pivotally supported on the bearing member of the base member, and the left and right arms A lock lever provided with a swing handle on the rear end side and provided with a locking rod attached to and detached from the front end hook portion of the base member on the front end side; and slide of the base member A cam slider that is slidably fitted in the interior, the positioning block having a positioning projection facing the inside of the opening at the tip and forming an engagement pin on the side, and the cam slider is formed on the upper part of the main body. The lock lever has a pressing protrusion that engages from above on the tip end side, and a tapered cam surface that slides on the rear surface of the positioning block inside the main body below the pressing protrusion and a side engaging pin that engages from below. It has a pull-out engagement part.

  Preferably, in the shank attaching / detaching mechanism, an elastic biasing member that presses the cam slider in the slide guide portion may be integrally attached to the rear portion of the base member.

  More preferably, in the shank attaching / detaching mechanism, an eccentric bearing ring having a thick front portion is integrally provided around the bearing member of the base member, and an elastic O-ring is interposed between the intermediate fulcrum shaft of the lock lever and the eccentric bearing ring. May be.

  Since the present invention is configured as described above, when the swing handle of the lock lever is rotated upward, the lock lever engaging hook engages with the tip hook portion of the base member, and the shank is locked at a designated position with one touch. Is done.

  On the other hand, when the swing handle of the lock lever is rotated downward from the locked state, the tip locking rod is released with one touch, and the locking slider engages the concave pressure protrusion of the cam slider and pushes up the cam slider. Since the pull-out engaging portion engages with the engaging pin of the positioning block and pulls up the positioning block along the descending inclined surface of the opening, the horizontal shank is slidable in the shank coupling hole.

Overall appearance of cultivator Work unit perspective view Assembly exploded view of shank attachment / detachment mechanism according to the present invention Figure 3 equivalent view seen from a different direction Enlarged perspective view of positioning block Front enlarged perspective view of cam slider Assembly view of the shank attachment / detachment mechanism according to the present invention Lock assembly diagram of shank attachment / detachment mechanism according to the present invention Action explanatory drawing of the shank attaching / detaching mechanism by this invention Action explanatory drawing of the shank attaching / detaching mechanism by this invention Action explanatory drawing of the shank attaching / detaching mechanism by this invention

Embodiments of the present invention will be described below with reference to the accompanying drawings.
In the figure, the same reference numerals as in the conventional example indicate the same members.
As shown in FIGS. 3 and 4, a horizontal shank joint 2 is provided in a work machine bracket 1 integral with a cultivator's central beam 14, and a horizontal shank in which a culture claw or the like is integrally coupled to the shank joint 2. 16 is fitted so that the width can be adjusted by expansion and contraction.
Although the above configuration itself is not different from the conventional one, the shank attachment / detachment mechanism of the present invention is basically configured so that the opening 4 formed in the rear wall 3 of the shank coupling port 4 and the opening 4 can slide. A positioning block 5 to be fitted to the base, a slide guide portion 6a in the middle, a base member 6 which is integrally coupled to the rear surface of the bracket of the shank coupling port 2 so as to face the opening 4, and the base member 6 And a cam lever 8 fitted to the slide guide portion 6a of the base member 6.
Reference numeral 16a denotes a positioning recess formed on the rear surface of the shank 16 (the surface facing the opening 4).

  The opening 4 is formed so that the upper and lower surfaces of the opening are formed as a downward inclined cut surface, and the positioning block 5 fitted to the opening 4 is slidable up and down and back and forth along the downward inclined surface.

  As shown in an enlarged view in FIG. 5, the positioning block 5 has a positioning projection 5a facing the engagement recess 16a of the shank 16 at the tip that faces the opening 4, and on the side of the cam slider 8 to be described later. An engagement pin 5b that engages with the portion 8c is provided.

  The base member 6 is provided with a hook portion 6d at the front end of the frame body in which the slide guide portion 6a for receiving the cam slider 8 is formed in the axial direction of the central portion of the frame body as described above, and the lock on the upper outer side of the frame body. The left and right bearing members 6b and 6b that pivotally support the lever 7 are integrally formed, and are fixed to the rear surface of the bracket of the shank joint 2 with bolts 17 or the like.

  The lock lever 7 pivotally supports the intermediate fulcrum shafts 7a and 7a of the left and right arms 7b and 7b on the left and right bearing members 6b and 6b of the base member 6, and swings on the rear end side of the left and right arms 7b and 7b. 7d is provided, and a locking rod 7c that is attached to and detached from the tip hook portion 6d of the base member 6 fixed to the bracket is provided on the tip side.

Further, as shown in FIG. 6, the cam slider 8 has a pressing protrusion 8a that engages from the upper side to the distal end side of the lock lever 7 at the top of the main body, and the inside of the main body below the pressing protrusion 8a. A tapered cam surface 8b (sliding contact with a downward inclined surface below the upper vertical surface) that is in sliding contact with the rear surface 5c of the positioning block 5 and an engagement pin 5b on the side surface of the positioning block 5 are engaged from below. A pull-out engaging portion 8c.
The pulling engagement portion 8 c is engaged with the engagement pin 5 b of the positioning block 5 as the cam slide 8 is moved upward by the lock lever 7, whereby the positioning block 5 is utilized by the downward inclined surface of the opening 4. Thus, it is made to recede obliquely upward, and can be constituted by a substantially U-shaped groove or step.

The shank attaching / detaching mechanism of the present invention is assembled by the above-described components as shown in FIGS. 7 and 8, but as a more preferred embodiment, the positioning block 5 is inserted into the slide guide portion 6 of the base member 6. The cam slider 8 with a taper is pressed toward the shank engagement hole 2 by the cam surface 8b, but the cam slider 8 is pressed against the rear portion of the base member 6 in order to increase the pressing force and eliminate backlash due to the gap. An elastic biasing member 9 is provided.
3 and 4, the elastic biasing member 9 is constituted by a pressure pin 9b biased by a disc spring 9a and is compressed and stored in a chamber 19 provided at the rear portion of the base member 5.

  Further, in the illustrated embodiment, as shown in FIGS. 3 and 4, eccentric bearing rings 6 c and 6 c having a thick front portion are integrally provided around the bearing members 6 b and 6 b of the base member 6. When elastic O-rings 10 and 10 are interposed between the intermediate fulcrum shafts 7a and 7a and the eccentric bearing rings 6c and 6c, when the lock lever is in the locked position, the thick bearings of the eccentric bearing rings 6c and 6c are pushed. The lock lever 7 is not easily removed from the lock position by the reaction force of the O-ring 10 that is crushed and elastically deformed.

Next, the operation of the present invention will be described.
Since the present invention has the above-described configuration, as shown in FIG. 9, the horizontal shank 16 is set to a desired working width and inserted into the shank coupling hole 2, and then the cam slider 8 is inserted into the slide guide portion 6a of the base member 6. 10, the tapered cam surface 8 b of the cam slider 8 presses the positioning block 5 in the opening 4 toward the shank coupling hole 2 of the bracket 1, and the positioning projection 5 a of the positioning block 5 becomes the shank 16 as shown in FIG. 10. It fits into the positioning recess 16a.
When the swing handle 7d of the lock lever 7 is rotated upward in this state, the locking rod 7c of the lock lever 7 is engaged with the tip hook portion 6d of the base member 6 as shown in FIG. Lock in position.

  On the other hand, when the swing handle 7d of the lock lever 7 is rotated downward from the locked state of FIG. 10, the distal end locking rod 7c is released, the lock is released, and the locking rod 7c is moved to the concave pressure protrusion of the cam slider 8. As the cam slider 8 is pushed up by engaging with 8 a, the pull-out engaging portion 8 c of the cam slider 8 engages with the engaging pin 5 b of the positioning block 5, and the positioning block 5 is moved along the downward inclined surface of the opening 4. In order to pull up, the shank 16 is slidable within the shank coupling hole 2.

  In the above, the case where the horizontal shank 16 is coupled to the horizontal shank coupling hole 2 has been described. However, the shank attachment / detachment mechanism of the present invention is not limited to this, and the vertical shank is coupled to the vertical shank coupling port. Applies to and includes cases.

  The present invention is widely used for attaching / detaching a shank of a working machine such as a cultivator, which eliminates the complexity of attaching / detaching and contributes to improvement of working efficiency.

DESCRIPTION OF SYMBOLS 1 ... Work implement bracket 2 ... Shank joint 3 ... Rear wall 4 ... Opening part 5 ... Positioning block 5a ... Positioning protrusion 5b ... Engagement pin 5c ... Rear surface 6 ... Base member 6a ... Slide guide part 6b ... Bearing member 6c ... Eccentricity Bearing ring 6d ... Tip hook portion 7 ... Lock lever 7a ... Intermediate fulcrum shaft 7b ... Arm 7c ... Locking lever 7d ... Swing handle 8 ... Cam slider 8a ... Pressing protrusion 8b ... Tapered cam surface 8c ... Pulling engagement portion 9a ... Belleville spring 9b ... Pressure pin 9 ... Elastic biasing member 10 ... O-ring 11 ... Cultivator 12 ... Horizontal bar 13 ... Working unit 14 ... Bone beam 15 ... Soil claw 16 ... Horizontal shank 16a ... Positioning recess 17 ... Bolt 18 ... Bolt hole 19 ... chamber

Claims (3)

A shank coupling hole (2) of the bracket (1) to which the shank of the work attachment is fitted; and an opening (4) having upper and lower surfaces opened by a downward inclined cut in the rear wall (3) of the shank coupling hole (2); A positioning block (5) that is slidably fitted into the opening (4) and protrudes and departs in and out of the opening (4); a direction perpendicular to the shank coupling hole (2) at the center of the frame The base member (1) is provided with a slide guide (6a) extending to the left and right, and bearing members (6b) are provided on the left and right sides of one end, and are integrally coupled to the bracket (1) so as to face the positioning block (5). 6) and; an intermediate fulcrum shaft (7a) of the arm (7b) is pivotally supported on the bearing member (6b) of the base member (6), and a swing handle is mounted on the rear end side of the left and right arms (7b). (7d) is provided and the base portion is provided on the distal end side. A lock lever (7) provided with a locking rod (7c) to be attached to and detached from the tip hook portion (6d) of (6); and a slidable fit in the slide guide portion (6a) of the base member (6) The positioning block (5) has a positioning projection (5a) facing the opening (4) at the tip and an engaging pin (5b) on the side surface. The cam slider (8) has a pressing protrusion (8a) that engages from above on the distal end side of the lock lever (7) at the top of the main body, and the positioning block (8a) below the pressing protrusion (8a) inside the main body. 5) An agricultural machine attachment comprising a tapered cam surface (8b) slidably contacting the rear surface (5c) and a pulling engagement portion (8c) engaged from below with the side surface engaging pin (5b). shank Disengaging mechanism The shank attachment / detachment mechanism according to claim 1, further comprising an elastic biasing member (9) for pressing the cam slider (8) in the slide guide portion (6a) on the base member (6). An eccentric bearing ring (6c) whose front is thick is integrally provided around the bearing member (6b) of the base member (6), and between the intermediate fulcrum shaft (7a) and the eccentric bearing ring (6c) of the lock lever (7). The shank attachment / detachment mechanism according to claim 1 or 2, further comprising an elastic O-ring (10) interposed between the two.

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