JPS6222450Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a side clutch switching device for a mobile agricultural machine such as a Taylor that can change the direction of the handle.

Conventionally, in this type of mobile agricultural machinery, switching the side clutch left and right when the handle was turned was done manually by changing wires, etc., which required tedious work each time the handle was turned, reducing work efficiency. I was letting it happen. In addition, various devices have been proposed that automatically switch the left and right side clutches as the handle turns, but all of these devices reduce the strength of the handle attachment part and require a long stroke to switch. Furthermore, since many parts were moved, the system had drawbacks such as not being smooth, and was not satisfactory. For example, in the system disclosed in Japanese Utility Model Application No. 55-53668, a cam lever is attached to the handle boss part, and a cam surface on which the cam lever slides is installed on the fuselage body, so that the movement of the cam lever as the handle rotates can be used to move left and right. Although the side clutch is switched, the strength of the handle boss part needs to be set high because the handle can rotate, but an uneven load is applied to the boss part from the cam lever, and the handle Coupled with the fact that the boss is fitted into a hollow fuselage boss for the wire to pass through, this results in a decrease in the strength of the handle attachment part.

Therefore, the present invention provides a mobile agricultural machine that is capable of changing the direction of the handle with respect to the machine body and is equipped with a switching mechanism that reverses the interlocking of the left and right side clutches as the direction of the handle changes. A link shaft consisting of a double shaft that coincides with the core and whose axial movement is prevented and at least one of which is supported at two places is arranged, and both link shafts, a connection/disconnection mechanism, and the switching mechanism are arranged. The left and right side clutch operating parts are connected to the left and right side clutch operating parts respectively via the handle, and a cam mechanism is disposed that is displaced by relative movement between the handle and the machine body, and the connection/disconnection mechanism connects the cam to the left and right side clutch operating parts. A mechanism is configured to connect and disconnect each link shaft and the left and right side clutch operating parts or the left and right side clutch operating parts, and the switching mechanism includes a shift shaft that slides in the axial direction by the cam mechanism; an interlocking arm that is fixed to each link shaft and has a play hole passing through the shift shaft; It is an object of the present invention to provide a side clutch switching device which is characterized by comprising switching arms that can be respectively engaged at the side and proximal ends, and which eliminates the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the Taylor 1 has a fuselage 3 equipped with an engine 2, and the fuselage 3 has wheels 5 suspended thereon, as well as a handle 6 that can change its direction back and forth. There is. Further, as shown in FIGS. 2 and 3, the handle 6 is rotatably attached to a boss 7a of a case 7 fixed to the body 3, and the handle fixing knob 9 is attached to a recess 10 of the boss 7a.
By engaging with 10..., it is attached so that it can be fixed at any position. In addition, left and right link shafts 11 and 12, which are double shafts, are supported concentrically and freely rotatably in alignment with the rotational axis of the boss portion 7a, and have splines 11a and 12a at their upper ends, respectively. A link shaft 12 constituting the inner shaft is supported at its lower end by the case 7 and at its upper part by a boss 7a. The spline 11
Levers 13 and 15 are removably fitted to a and 12a, respectively, to form a connection/disconnection mechanism.
Furthermore, the levers 13, 1 are moved by the spring 16.
5 is in contact with the upper surface of the mounting boss 6a, and in the normal state, each lever 13, 15 is connected to the spline 11a, 1
2a, and both levers 13, 15 are connected to Bowden wires 17, 1.
9 to left and right side clutch operating levers 20 and 21 located on the handle 6, respectively. On the other hand, both link shafts 11,1
Interlocking arms 22 and 23 are fixed to the lower part of 2, respectively, and each arm 22 and 23 has a clearance hole 2.
2a, 23a, and engagement holes 22b, 23b and 22c, respectively, on the distal end side and proximal end side across the clearance hole.
23c is bored. A shift shaft 25 is slidably fitted into the case 7 at a position penetrating through the play holes 22a and 23a, and the shaft 25 has left and right shift lever bosses 27 on the upper and lower parts thereof, respectively. 29 is rotatably supported. Furthermore, switching arms 27a, 27b and 29a, 29b each have an engaging portion with a hook-shaped tip at a predetermined position above and below the interlocking arms 22, 23 of both bosses 27, 29.
are fixed, and these arms are connected to the interlocking arm 2.
2, 23 each of the engagement holes 22b, 22c and 23b, 2
In addition, shift levers 27c and 29c are fixed to the abutting portions of both bosses 27 and 29, respectively, and extend on both left and right sides, and both levers have elongated holes on both left and right sides. 30, 30' are bored. Furthermore, pins 31 and 31' are fitted so as to pass through the long holes 30 and 30' of both levers, and these pins 31 and 31' are connected to the left and right side clutches, respectively. bowden wire 3
It is fixed at 2,33. On the other hand, the shift shaft 25 is provided vertically penetrating the case 7, and is urged by a spring 35 to protrude upward. The protruding end of the shaft 25 is in contact with a cam plate 36 fixed to the attachment boss 6a of the handle, and the cam plate 36 is further fixed to the case 7 at the outer periphery of the contact portion of the shaft 25. It is in contact with the pin 37. The cam plate 36 also has a pin 37 as shown in FIG.
A low position a and a high position c are formed alternately on the outer peripheral part where the shaft 25 comes into contact, and a middle position b is formed on the inner peripheral part where the shaft 25 comes into contact at a portion slightly less than half the circumference, and a low position a is formed on the remaining part. .

In addition, 39 and 40 in the figure are return springs for the wires 17 and 19, and each interlocking arm 22,
As shown in FIG. 3, the relationship between the engagement holes 22b, 23b, 22c, 23c of 23 and the axes of the link shaft 11 and shift shaft 25 is approximately L ₁ /L ₂
The relationship is = L ₃ / L ₄ .

Since this embodiment has the above configuration, when the handle 6 is fixed in the normal position shown in FIGS. 1 to 3, the pin 37 is connected to the cam plate 3
6, and the protruding end of the shaft 25 is located at a low position a, that is, at position A in FIG. Therefore, the shift shaft 25 is pushed against the spring 35 by the lower position a of the cam plate 36 and is in the lower position, so that the upper switching arms 27a and 29a are engaged with the inner engagement holes of the interlocking arms 22 and 23, respectively. 22c and 23c. In this state, when one of the side clutch operating levers 20, 21, for example, the right operating lever 20, is operated, the lever 15 is rotated from A to B position via the wire 19 as shown in FIG. Further, the link shaft 12 is rotated via the spline 12a, and the interlocking arm 23 integrated therewith is rotated from the C to the D position. Then, since the interlocking arm 23 is engaged with the switching arm 29a through the inner engagement hole 23c, the shift lever 29c is rotated counterclockwise in FIG. Moving. As a result, the wire 33 is pulled through the elongated hole 30 and the pin 31, and the right side clutch is disengaged. At this time, the portion extending to the left of the shift lever 29c also rotates, but the elongated hole 30'
Therefore, the pin 31' is maintained at the E position. Similarly, when the left side clutch operation lever 20 is operated, the link shaft 11, the interlocking arm 22,
The left side clutch is disengaged via the shift lever 27 and wire 32.

Next, in order to rotate the handle 6 from the normal position to the reverse position, the fixing knob 9 is loosened and the handle 6 is rotated. At this time, the cam plate 36 also rotates together with the handle 6, but the pins 37 are successively located at the lower position a of the cam plate 36, and the handle attachment boss 6a resists the spring 16 as shown in FIG. and is pushed upward. As a result, both the levers 13 and 15 are removed from the splines 11a and 12a, and the handle 6
can rotate independently of the link shafts 11, 12. Then, when the handle 6 is rotated 180 degrees to the reverse position, the pin 37 is located again at the high position c of the cam plate 36, the handle attachment boss 6a is lowered together with the cam plate 36, and both levers 13 and 15 are opened again. It engages with splines 11a and 12a. Then, by tightening the fixing knob 9 at this position,
The handle 6 is fixed in the reverse position.

When the handle 6 is in the reverse position, the shaft 2
The projecting end of 5 is located in the middle position b, i.e. in position B in FIG. 4, so that, as shown in FIG. 27b,2
9b is the outer engagement hole 22 of the interlocking arms 22, 23
b, 23b. In this state, when one of the side clutch levers 20, 21, for example the right operating lever 20, is operated, the wire 1
As shown in FIG. 7, the lever 15 is
The link arm 23 is rotated from the A' position to the B' position, and the interlocking arm 23 is rotated from the C' position to the N' position via the link shaft 12 in the same manner as described above. Then, since the interlocking arm 23 is engaged with the switching arm 29b via the outer engagement hole 23b, the shift lever 29c is moved to the boss 2.
It is rotated clockwise in FIG. 7 about 9, and moves from E' to E' position. This causes the wire 32 to be pulled through the elongated hole 30' and the pin 31', thereby disengaging the right side clutch. Similarly, when the left side clutch operating lever 20 is operated, the left side clutch is disengaged via the wire 33.

8 and 9 show a partially modified embodiment, in which the switching mechanism, that is, the interlocking arms 22, 23, the shift shaft 25, and the vertical switching arms 27a, 27b and 29a, 29b, are connected to the handle 6. It is installed in the mounting part 6a. Along with this change, the levers 1 connected to the side clutch operating levers 20 and 21 are connected to the bosses 27 and 29 loosely fitted to the shift shaft 25, respectively.
Further, the shift shaft 25 protrudes and extends below the handle 6, and its protruding end abuts against a cam portion 36a formed in the case 7.

Therefore, in the normal position, that is, as shown in the drawing, the upper switching arms 27a and 29a are connected to the interlocking arms 22 and 23.
When the side clutch operating levers 20, 21 are engaged with the inner engaging holes 22c, 23c of the
When one of these, for example, the right operating lever 20, is operated, the lever 15 is rotated via the wire 19, and the interlocking arm 23 is rotated counterclockwise. As a result, the shift lever 29c also rotates in the same direction via the link shaft 12, pulling the wire 33 through the elongated hole 30 and pin 31, and disengaging the right side clutch.

As explained above, according to the present invention, the shifter shaft 25 slides as the handle 6 rotates, and the interlocking of the left and right side clutches can be automatically reversed. Left and right side clutch operation section 1 located at
3, 15, 17, 19, 20, 21, and the left and right side clutch operating parts 27c located in the three parts of the fuselage.
29c, 32, 33 are the link shafts 11, 12, which are double shafts that coincide with the rotation axis of the handle 6, are prevented from moving in the axial direction, and at least one of them is supported at two locations. Since they are connected together, an unbalanced load from the side does not act on the mounting boss portion 6a of the handle 6, and the case boss portion 7a is reinforced by the double shafts 11 and 12, increasing the strength of the handle mounting portion. In addition, the left and right side clutch operating parts and the actuating part are smoothly interlocked, and the side clutches can be operated reliably. Furthermore, as the handle 6 rotates, the connection/disconnection mechanism disconnects each link shaft 11, 12 from the left and right side clutch operation section or actuating section based on the cam mechanisms 36, 36a, 37. No matter how many times the handle 6 is rotated in the same direction, the handle 6 can be rotated without twisting the wire or the like and without affecting the switching mechanism. 23 and switching arms 27a, 27b, 29
a, 29b on the distal end side 22b, 23b or the proximal end side 22 with the play holes 22a, 23a in between.
c and 23c to switch the left and right side clutches, a small adjacent stroke is sufficient to switch each switching arm to the interlocking arm. operation can be ensured.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a tailor to which the present invention is applied, Fig. 2 is a longitudinal sectional view with the handle installed in the correct position, Fig. 3 is a schematic plan view thereof, and Fig. 4 is a cam plate. In the figure, a is a plan view,
b is a partial sectional view, FIG. 5 is a vertical sectional view showing the handle in a rotating state, FIG. 6 is a vertical sectional view with the handle installed in the reverse position, and FIG. 7 is a schematic plan view thereof. FIG. 8 is a longitudinal sectional view showing another embodiment, and FIG. 9 is a schematic plan view thereof. 1... Mobile agricultural machine (Taylor), 3... Aircraft, 6
...Handle, 11,12...Link shaft,
13, 15, 17, 19, 20, 21...Side clutch operation section, 22, 23, 27a, 27
b, 29a, 29b...Switching mechanism, 25...Shift shaft, 27c, 29c, 32, 33...
Side clutch actuating part, 36, 36a, 37...
cam mechanism.

Claims (1)

[Scope of utility model registration request] In a mobile agricultural machine that is equipped with a switching mechanism that can change the direction of the handle with respect to the machine body and reverses the interlocking of the left and right side clutches as the direction of the handle is changed, A link shaft consisting of a shaft, which is prevented from moving in the axial direction, and at least one of which is supported at two places, is arranged, and the left and right sides are connected to each other through both link shafts, the connection/disconnection mechanism, and the switching mechanism. A cam mechanism is provided that connects the clutch operation section and the left and right side clutch operation sections and is displaced by relative movement between the handle and the machine body, and the connection/disconnection mechanism is connected to each link shaft by the cam mechanism. The switching mechanism is configured to connect/disconnect the left and right side clutch operating parts or the left and right side clutch operating parts, and the switching mechanism is fixed to a shift shaft that slides in the axial direction by the cam mechanism and to each of the link shafts. an interlocking arm having a clearance hole passing through the shift shaft; a side clutch switching device comprising respective switching arms that can be respectively engaged with each other;