JP3165660U - Detachable device for differential mechanism of small tillage machine - Google Patents

Abstract

Disclosed is a diff mechanism interlock release device that enables a diff lock to be released in conjunction with movement of a shift lever that operates a rotary device in a small cultivator equipped with a diff mechanism. A transmission lever is disposed between a working position and a work stop position of a transmission lever in a lever guide hole so that a tip of the transmission lever is brought into contact with the transmission lever. 1 is pivotally supported by a passive reciprocating claw that protrudes so that it can pass, and the passive reciprocating claw is attached with a passive reciprocating claw biasing spring that urges the passive reciprocating claw to return between the working position and the working stop position. The deflation lever 2 is provided with a deflation lever releasing crank 6 that can operate the deflation lever 2 on the handle H. When the transmission lever 1 is moved to the work position and the work stop position, a passive reciprocating claw hits the transmission lever 1. Then, the deflation lever release crank 6 is interlocked by the wire 12 connected to the passive reciprocating claw, and the diff lock of the deflation lever 2 is released. [Selection] Figure 1

Description

  The present invention is a differential mechanism that controls the straightness of the left and right rotation gears provided in the wheel drive part of the mission of a small cultivator. The differential mechanism releases and unlocks the differential lock. The present invention relates to a device that operates in conjunction with a lever.

2. Description of the Related Art Conventionally, a small cultivator equipped with a differential mechanism that performs differential lock and differential lock release by an operation with a differential lever provided in a wheel drive section of a mission has been used.
The small cultivator has a mission for transmitting driving force to wheels and a rotary device for tillage work, and a gear speed change in the mission, and a gear change for changing the rotation, stop, gear change, etc. of the rotary of the rotary device. Has a lever.
And in the operation of such a small cultivator, at the time of tillage work, to improve the straightness of the small cultivator, it operates by operating the deflation bar at the diff lock position, and at the time of turning for changing the traveling direction In order to make the turning work easier and to ensure safety, the shift lever is operated to the neutral position where the rotary does not rotate, and in addition, the turning operation is performed by operating the deflation lever to the position where the diff lock is released. Yes.
Such an operation related to the two levers of the speed change lever and the deflation lever is the basis of the direction changing operation of the small tiller.

  On the other hand, as a technique to improve workability related to turning of the tiller, the rotational speed is electronically controlled so that the rotational speed of the engine becomes high when in the deflock state, and when turning, the engine is rotated at a low speed for safety. Japanese Patent Application Laid-Open Publication No. 2004-259542 has been proposed which enables the tiller to turn.

JP 2009-296932 A

In the conventional device that performs the two operations of the shift lever and the deflation lever separately, not only is the operation troublesome twice, but also it is not necessary to release the differential lock, so it remains locked In this case, the wheel may be forced to slide and turn, or the wheel may turn while the rotary rotates. However, when driving in such a manner, there was a risk that the steering wheel could not be operated during turning and the operation could not be performed, causing a fall accident.
In addition, the electronic control method disclosed in Patent Document 1 requires a high level of electronic control technology, and thus has a difficulty in that the apparatus is complicated and the manufacturing cost increases.

  Therefore, the present invention performs the tilling work from the position where the tillage work is performed with respect to the transmission and the rotary device in the small tiller having the above-described differential mechanism. When moving to a new position, the operation of changing the direction of a small cultivator is made easier than before by using a mechanical method, not an electronic method, and releasing the diff lock in conjunction with the speed change lever. It is an object of the present invention to provide an interlock release device for a differential cultivator of a small tiller that can save time and can be operated safely.

In order to solve the above-mentioned problems, the interlock release device of the differential mechanism of the small cultivator of the present invention is a small cultivator having a mission for transmitting drive from a power source to wheels and a rotary device for cultivating work. .
The handle of the small cultivator includes a speed change lever for switching the speed of the transmission and rotation and stop of the rotary device to a set position of a lever guide hole of a cover with a lever guide hole, and the wheel drive of the mission. The part includes a differential mechanism for performing differential lock and differential lock release, and a differential lever for operating the differential mechanism.

A) On the side of the speed change lever, the speed change lever in the lever guide hole faces between the work position and the work stop position of the speed change lever so that the tip of the speed change lever comes into contact with the speed change lever. A passive reciprocating claw that is protruded so as to pass through is pivotally supported on a passive reciprocating claw pivot provided on the cover with the lever guide hole, and the passive reciprocating claw pivotally supported on the passive reciprocating claw pivot is a working position and a working stop position. A passive reciprocating claw biasing spring biased in the middle is mounted; and b) a deflation lever releasing crank that allows the deflation lever to be operated on the handle, and c) the deflation lever releasing crank; A passive reciprocating claw is connected directly or indirectly via a wire.
The differential lever is interlocked at the same time when the shift lever is operated, and the differential lock can be released.

  According to a second aspect of the present invention, in the above-mentioned device, a passive reciprocating claw is provided with a connecting piece having a distal end projecting sideways of a cover with a lever guide hole on the passive reciprocating claw pivot support portion on the shift lever side. The base end portion of the wire is connected to the distal end portion of the connecting piece.

  According to a third aspect of the present invention, in each of the above-mentioned devices, on the deflation side, a deflation lever releasing crank is pivotally supported on a pivot portion provided on a deflation mounting bracket for pivotally supporting the deflation lever. The base end of the wire is connected to the distal end of the wire, and the other tip of the deflation release crank is brought into contact with the deflation so that the operation of the deflation is possible. A push spring is mounted between the base end portion and the wire guide hole that determines the passage position of the wire provided in the handle.

In the device according to claim 4, in each of the above devices, a wire guide hole for deflation that determines a passing position of the wire for deflation provided in the handle, and a pivoting portion of a deflation fitting for pivoting the deflation The position of the base end portion of the deflation bar is set so that the distance between the deflation wire guide hole and the base end portion of the deflation bar connecting the deflation wire is longer than the connection length.
Then, the deflation wire which is tensioned by the spring attached to the diff mechanism by the operation of the deflation crosses the pivot, the def lock of the unlocked def mechanism is locked, and the deflation wire crosses the pivot. After that, a stopper is provided at a position where the deflation hits.

In the device according to claim 5, in each of the above devices, the lever guide hole has one or more branch guide holes connected to the lever guide hole of the cover with a lever guide hole according to claim 1, The lever guide hole is set so that different operations can be performed when the shift lever is inserted into the lever guide hole and the branch guide hole, and the shift guide lever is located between the shift lever working position and the work stop position. Thus, the passive reciprocating claw that is projected so that the transmission lever can pass through the branch guide hole is pivotally supported by the passive reciprocating claw pivot provided on the cover with the lever guide hole.
When moving the shift lever from the work position to the work stop position, when the shift lever hits one of the passive reciprocating claws provided in the lever guide hole or the branch guide hole, each passive reciprocating claw is It is characterized by an interlocking mechanism that can move the connecting piece in the direction of unlocking the differential lock in conjunction with it.

In the conventional small cultivator, it is necessary to adjust the position of the rotary lever to a position where the rotary is not rotated by turning the shift lever and to operate the deflation lever to release the diff lock.
On the other hand, in the present invention, the shift lever for operating the rotary is moved from the working position to the position where the work is not performed, and at the same time, the passive reciprocating claw is rotated to release the wire and the deflation that are connected to the passive reciprocating claw. The deflation lever is mechanically linked via the crank, and the diff lock is released.
As a result, the differential lock can be released at the same time by the operation of the shift lever. As a result, there is no unreasonable operation when turning the small cultivator, and the cultivator can be rotated safely and smoothly. Can also be prevented.

  In the invention of claim 2, the small rotation width of the passive reciprocating claw on the shift lever side can be converted to a large reciprocating movement with the connecting piece, and the wire connected to the end portion of the connecting piece can be effectively extended to an effective distance. It becomes possible to draw.

  In the invention of claim 3, when the base end portion of the deflavor releasing crank connected with the wire is pulled with the wire on the deflavor side, the deflavor releasing crank brought into contact with the rear side in the releasing direction of the deflavor is The diff lock can be reliably released by pressing the deflation bar. For this reason, it becomes possible to perform the swivel operation of the tiller safely.

  According to the invention of claim 4, when the deflock is manually operated by the deflation, the deflation wire which is tensioned by the spring is locked so that the deflation does not return naturally across the pivot, Sometimes it is possible to operate with the straightness of the small cultivator improved.

According to the fifth aspect of the present invention, when the speed change lever is inserted into any of the plurality of guide holes connected to the lever guide hole, each passive reciprocating claw pivot provided in the guide hole of the cover with the lever guide hole is pivotally supported. The shift lever hits the passive reciprocating claw, and each passive reciprocating claw is interlocked by an interlocking mechanism to mechanically release the diff lock.
For this reason, even when the lever guide holes are provided with a plurality of guide holes and different operations are performed, the diff lock is automatically released when each operation is changed from one operation to another as the shift lever moves. Thus, it is possible to safely perform the swiveling work of the tiller.

It is a side view of the small cultivator which shows the use condition of this invention. (A) which shows the principal part by the side of a transmission lever is a top view, (b) is a side view. It is the perspective view seen from diagonally downward which shows the state which decomposed | disassembled the component of the cover part with a lever guide hole. It is the perspective view seen from the diagonal upside which shows the state which decomposed | disassembled the component of the principal part by the side of a deflation. The upper part of the main part on the deflavor side is the rear part and the lower part is the front part, (A) is a plan view, and (B) is a side view. (B) of the differential lock device portion is a side view, and (b) is a side view as seen from an arrow E in FIG. (B) shows the state of the work position of the second step, (b) shows the state where the two passive reciprocating claws on the second step side and the first step side are interlocked. FIG.

In general, as shown in FIG. 1, a walking type small tiller is configured to run by rotating a driving wheel using an engine or a motor as a power source, and a transmission M that transmits driving to the driving wheel and a tilling work. A rotary device R is provided.
In a small cultivator provided with a speed change lever 1 for changing the vehicle speed of the mission M and the rotary device R and a differential mechanism D capable of diff-locking and releasing the diff-lock in the wheel drive unit of the transmission M, In order to improve the straightness of the small cultivator, the diff lock position is set to increase the straightness and the tillage work is performed. The shift lever can be operated to a position where it does not rotate, and in addition, the deflation can be operated to turn to a position where the diff lock is released.

  The interlock release device of the differential mechanism according to the present invention is mounted on the above-mentioned walking type small cultivator, and the speed change lever for switching the vehicle speed of the transmission M of the cultivator and the work of the rotary device R by the cover 7 with a lever guide hole. 1 and the deflation bar 2 provided on the handle H for operating the diff mechanism D for diff-locking and releasing the diff-lock to the wheel drive unit K of the transmission M, the deflation bar 2 can be operated simultaneously by operating the speed change lever 1. It aims to be.

The interlock release device for the differential mechanism of the present invention will be described below with reference to the drawings showing embodiments.
As shown in FIG. 1, the present invention has a lever guide hole 8 provided in a cover 7 with a lever guide hole, as shown in FIG. A passive reciprocating claw 4 having a tip portion 4a facing between a work position A and a work stop position B is pivotally supported on a passive reciprocating claw pivotal support portion 9 provided on the cover 7 with a lever guide hole. The front end portion 4a of the gear 4 abuts against the speed change lever 1 and protrudes through the lever guide hole 8 so that the speed change lever 1 can pass therethrough.

A passive reciprocating claw biasing spring 11 is provided on the passive reciprocating claw pivot 9 and the spring fixing holes 16 and 17 provided in the cover 7 with lever guide hole and the passive reciprocating claw 4 as shown in FIG. Between the work position A and the work stop position B so that the tip 4a of the passive reciprocating claw 4 returns between the work position A and the work stop position B in the lever guide hole 8. Energize to attach.
The passive reciprocating claw pivotal support portion 9 pivotally supports the base end portion of the connecting piece 5 with the end portion 5a protruding to the side of the cover 7 with the lever guide hole so as to be interlocked with the rotation of the passive reciprocating claw 4.
The connecting piece 5 and the passive reciprocating claw 4 are configured such that a connecting piece connecting protrusion 18 provided on the passive reciprocating claw 4 is sandwiched and restrained by a protrusion holding notch 19 provided at a base end portion of the connecting piece 5. The rotation of the connecting piece 5 and the rotation of the passive reciprocating claw 4 can be interlocked.

Further, as shown in FIGS. 4 and 5, on the side of the deflation lever 2, a deflation lever releasing crank 6 is pivotally supported on a pivot portion 10 of a deflation mounting bracket 15 that pivotally supports the deflation lever 2. A distal end portion 3b of the wire 3 that connects the distal end portion 5a of the connecting piece 5 is fixed to the proximal end portion 6a.
The pivot portion 10 of the deflation fitting 15 is provided with a pivot shaft 10a for pivotally supporting the deflator 2. The pivot shaft 10a is inserted into the pivot portion 10 and the deflation release is performed on the pivot shaft 10a. A pivot support hole 10 b provided in an intermediate portion of the crank for use is inserted, and the crank 6 for releasing the deflation lever is pivotally supported on the pivot support portion 10 of the deflation fitting 15.
Further, when the tip 6b of the crank for releasing deflation pushes the deflation 2, the tip 6b of the crank for releasing the deflation is moved to the rear side in the releasing direction of the deflation 2 so that the deflation can be released by moving the deflation 2. It arrange | positions in contact with.
Further, the handle H is provided with a wire guide portion 20 having a wire guide hole for determining the passage position of the wire 3, and a wire insertion coil pushing spring 12 is interposed between the proximal end portion 6 a of the deflavor releasing crank and the wire guide portion 20. Installing.

Further, the handle H is provided with a wire guide portion 21 having a deflation wire guide hole for determining a passage position of the deflation wire 13.
And the distance which connects the wire guide part 21 for the said deflation and the base end part 2a of the deflation bar 2 rather than the distance which connects the wire guide part 21 and the pivot part 10 of the deflation fitting 15 which supports the deflation 2 The position of the base end portion 2a of the deflation bar 2 is determined so that the length becomes longer.
Then, by the operation of the deflation lever 2, the deflation wire 13 tensioned by the spring 23 attached to the diff mechanism D shown in FIGS. 6 (a) and 6 (b) was released across the pivot portion 10. A differential lock of the differential mechanism is made possible, and a stopper 14 is provided to stop the deflation lever 2 after the deflation wire 13 crosses the pivotal support portion 10.

  Since the present invention has the above-described configuration, when the shift lever 1 is moved to the work position A and the work stop position B in the lever guide hole 8, the deflation bar 2 moves in conjunction with the movement, and the differential lever 1 is moved. The differential lock of mechanism D is released, and the mechanism will be described next.

First, the shift lever 1 is moved from the work position A to the work stop position B as shown in FIG.
At this time, the tip 4 a of the passive reciprocating claw 4 hits the shaft of the speed change lever 1 and rotates. As the passive reciprocating claw 4 rotates, the connecting piece connecting projection 18 of the passive reciprocating claw 4 shown in FIG. 3 pushes the protrusion clamping notch 19 of the connecting piece 5, the connecting piece 5 rotates, and the end portion 5 a of the connecting piece 5. The wire 3 connected to is pulled.
When the wire 3 is pulled, one base end portion 6a of the deflavor releasing crank 6 connected to the wire 3 is pulled against the wire insertion coil pushing spring 12 on the side of the deflavor 2 shown in FIG. At this time, the other tip 6b of the deflation lever releasing crank 6 pushes the deflation lever 2 in the releasing direction, and the diff lock of the diff mechanism D is released.

At this time, after the deflation wire 13 crosses the pivot portion 10, the deflation wire 2 stops against the stopper 14, and the deflation wire 13 is stopped by the spring 23 attached to the differential mechanism D with respect to the pivot portion 10. Therefore, the deflation 2 will not return naturally.
When the shift lever 1 reciprocates between the work position A and the work stop position B, the distal end portion 4a of the passive reciprocating claw 4 is formed between the passive reciprocating claw biasing spring 11 and the wire insertion coil pushing spring 12. The balance of the force is adjusted so that it always returns to the middle between the working position A and the working stop position B of the lever guide hole 8. For this reason, the crank 6 for releasing the deflation is pushed back by the wire insertion coil pushing spring 12 and is separated from the deflation 2.

Next, the case where the differential mechanism D is differentially locked will be described.
In the case of diff-locking, as shown in FIG. 5, the deflation lever 2 is manually operated from the state where the tip 2b of the flavour 2 is behind (upper side in FIG. 5) to the front (lower side in FIG. 5).
That is, when the deflation lever 2 is manually returned to the front, the tip end portion 2b of the deflation lever 2 rotates counterclockwise in FIG.
At this time, the deflation wire 13 that is tensioned by the spring 23 attached to the diff mechanism D shown in FIG. 6 crosses the pivot portion 10 and the diff mechanism D that has been released is locked.
After the deflation wire 13 crosses the pivotal support portion 10, the base end portion 2 a of the deflation lever 2 is pulled by the deflation wire 13 and moves further, and hits the stopper 14 and stops. In this state, the deflation bar 2 is not automatically returned because it is drawn toward the stopper 14 by the deflation wire 13.

In addition, the speed change lever 1 for switching the work speed of the transmission M of the small tiller and the rotary device R may be two-speed or three-speed, and the lever guide hole for operating the shift lever 1 is also switched. Lever guide holes branched according to the number of In the present invention, the diff lock of the diff mechanism D can be released corresponding to such a shift lever.
For example, as shown in FIG. 7, in the case of a two-speed lever guide hole 8 consisting of a first-stage guide hole 8a and a branched second-stage guide hole 8b, the first-stage guide hole 8a side is passive. About the structure of the reciprocating claw 4 and its peripheral part, it is common with the said structure.
On the branched second-stage guide hole 8b side, the second-stage passive reciprocating claw 24 is pivotally supported on the pivoting portion 25 with the passive reciprocating claw teeth provided on the cover 7 with the lever guide hole, and the speed change lever 1 is inserted. The front end 24a of the second-stage passive reciprocating claw 24 comes into contact with the speed change lever 1 between the work position (the position shown in FIG. 7 (a)) and the work stop position, and the second-stage The shift lever 1 protrudes through the guide hole 8b.
When the speed change lever 1 hits the second-stage passive reciprocating claw 24, an interlocking mechanism that enables the other passive reciprocating claw 4 to be interlocked at the same time is provided between the second-stage passive reciprocating claw 24 and the passive reciprocating claw 4. Provide between.

The interlocking mechanism can have various structures performed via a wire, a rod, a gear, and the like.
In the example of the interlocking mechanism shown in FIG. 7, a toothed pivoting portion 25 having teeth 25a formed on a part of the circumference is integrated with a second-stage passive reciprocating claw 24 provided facing the second-stage guide hole 8b. The connecting rods 27, 28, and 29 are installed between the interlocking toothed pivot portion 26 and the passive reciprocating claw pivot portion 9, and the end portions of the coupling rods 27, 28, and 29 are connected to the rod pivots. These are connected in series by pivotally supporting them at the branches 30 and 31.
7A shows a state in which the shift lever 1 is inserted into the second-stage guide hole 8b and is differentially locked and is in a working state. FIG. 7B shows that the second-stage passive reciprocating claw 24 has A state is shown in which the shift lever 1 is rotated and moved, and the passive reciprocating claw 4 of the first-stage guide hole 8a is also moved in conjunction with the rotation.

Next, the mechanism of this interlock will be described below.
As shown in FIG. 7 (a), the shift lever 1 that has been in operation while being moved toward the second-stage guide hole 8b is operated, and the shift lever 1 is moved in the right direction in the drawing to perform the operation. When it is attempted to stop, the shift lever 1 hits the second-stage passive reciprocating claw 24 as shown in FIG. 7B, and the second-stage passive reciprocating claw 24 is pushed by the shift lever 1 to rotate. To do.
When the second-stage passive reciprocating claw 24 is rotated, the toothed pivot 25 provided integrally with the second-stage passive reciprocating claw 24 is rotated, and the tooth 26a formed on the interlocking-tooth pivot 26 provided next thereto is rotated. The teeth 25a mesh with each other and the pivoting portion 26 with interlocking teeth rotates.
By the rotation of the pivoting portion 26 with the interlocking teeth, the connecting rods 27, 28, and 29 are interlocked, and the passive reciprocating claw pivoting portion 9 fixed to the passive reciprocating claw 4 rotates.
That is, when the second-stage passive reciprocating claw 24 is rotated by the speed change lever 1, the passive reciprocating claw 4 is simultaneously rotated in conjunction with it.
This mechanism is connected to the passive reciprocating claw 4 and interlocked by providing a connection structure similar to that of the second-stage passive reciprocating claw 24 even in the case of a three-speed shift or more. It becomes possible.
As a result, in the present invention, as shown in this example, it is possible to mechanically release the diff lock of the diff mechanism D in correspondence with a plurality of speed change levers.

  As described above, according to the present invention, the diff lock is automatically released simultaneously with the shift lever 1 being moved from the work position A to the work stop position B. It will be resolved. When the cultivator turns, there is no excessive driving and safe and smooth driving is possible.

  The present invention is mainly used for a small cultivator, but can be used for a large cultivator if it is a walking type.

DESCRIPTION OF SYMBOLS 1 Shift lever 2 Deflever 2a Deflever base end 2b Deflever tip 3 Wire 3a Wire base end 3b Wire end 4 Passive reciprocating claw 4a Passive reciprocating claw 5 Connection piece 5a Connection piece end 6 Deflever releasing crank 6a Deflever releasing crank base 6b Deflever releasing crank tip 7 Cover with lever guide hole 8 Lever guide hole 8a First stage guide hole 8b Second stage guide hole 9 Passive reciprocating claw pivot 10 Deflever pivot part 10a Pivot axis 10b Pivot hole 11 Passive reciprocating claw biasing spring 12 Wire insertion coil pushing spring 13 Deflever wire 14 Deflection top 15 Deflever mounting bracket 16 Spring fixing hole 17 Spring fixing hole 18 Connecting piece connecting protrusion 19 Protrusion clamping notch 20 Wire guide 2 DESCRIPTION OF SYMBOLS 1 Deflever wire guide 22 Wire guide hole 23 Spring 24 Second-stage passive reciprocating claw 25 Toothed pivot part 25a Tooth 26 Together pivot part with interlocking tooth 26a Tooth 27 Connecting rod 28 Interlocking rod 29 Interlocking rod 30 Rod pivot part 31 Rod pivoting part M Mission R Rotary device K Wheel drive D Differential mechanism A Work position B Work stop position

Claims (5)

In a small field cultivator having a mission for transmitting drive from a power source to wheels and a rotary device for tillage work,
The handle of the small cultivator includes a speed change lever for switching the speed of the transmission and rotation and stop of the rotary device to a set position of a lever guide hole of a cover with a lever guide hole, and the wheel drive of the mission. A differential mechanism for performing diff lock and diff lock release on the part, and a deflation for operating the diff mechanism,
a) On the side of the speed change lever, the front end of the speed change lever in the lever guide hole faces between the work position and the work stop position, and the speed change lever can pass through the lever guide hole. The passive reciprocating claw protruded to the lever reciprocating claw pivotal support portion provided in the cover with the lever guide hole is pivotally supported, and the passive reciprocating claw pivotal support portion is placed between the working position and the working stop position. Install the energized passive reciprocating claw energizing spring,
b) On the side of the deflation, a handle for releasing the deflation that enables the operation of the deflation on the handle is provided,
c) An interlock release device for a differential mechanism of a small tiller, in which the crank for releasing deflation and a passive reciprocating claw are connected directly or indirectly via a wire.   On the shift lever side, a passive reciprocating claw pivot is pivotally supported by a connecting piece having a distal end protruding to the side of the cover with a lever guide hole so as to be interlocked with the rotation of the passive reciprocating claw. The interlock release device for the differential mechanism of the small tiller according to claim 1, wherein the proximal ends of the wires are connected.   On the deflation side, a deflation lever release crank is pivotally supported on a pivot portion provided on a deflation lever mounting bracket for pivotally supporting the deflation lever, and a base end portion of the wire is connected to one base end portion of the deflation lever release crank. Sometimes the other tip of the crank for releasing the deflation is brought into contact with the deflation so that the operation of the deflation is possible, and the wire for determining the passage position of the wire provided on the base end of the deflation releasing crank and the handle The interlock release device for the differential mechanism of the small tiller according to claim 1 or 2, wherein a push spring is mounted between the guide hole and the guide hole.   From the distance connecting the deflation wire guide that determines the passage position of the deflation wire provided on the handle and the pivot portion of the deflation fitting that pivots the deflation lever, The position of the base end of the deflation is set so that the distance connecting the base end becomes long, and the deflation wire that is tensioned by the spring attached to the def mechanism by the operation of the deflation crosses the pivot part and is released 4. The stopper according to claim 1, further comprising: a stopper provided at a position where the deflation bar contacts after the deflation wire of the deflation mechanism is locked and the deflation wire crosses the pivot. Detachable device for the differential mechanism of a small field cultivator. 5. The interlock release device for a differential mechanism according to claim 1, wherein the lever guide hole has a plurality of work switching guide portions communicating with the lever guide holes of the cover with a lever guide hole, It is a lever guide hole set so that different work can be done when the shift lever is inserted in the guide part,
A passive reciprocating claw that projects between the working position and the working stop position of the shift lever at each guide portion of the guide hole so that the tip of the shift lever contacts the shift lever and the shift lever protrudes through the guide portion. Is pivotally supported by the passive reciprocating claw pivot provided on the cover with the lever guide hole,
When moving the shift lever from the work position to the work stop position, if the shift lever hits one of the passive reciprocating claws provided in the lever guide hole or the branch guide hole, each passive reciprocating claw is interlocked. The interlock release device for the differential mechanism of the small tiller is provided with an interlock mechanism that can move the connecting piece in the direction of releasing the differential lock.

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