JPH081606Y2 - Lifting control switch for work equipment with tractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a control switch for raising and lowering a work implement equipped with a tractor, such as a plowing rotor mounted on a tractor.

[Prior Art] An agricultural tractor is generally equipped with various types of work implements that can be raised and lowered. For example, a rotor for tillage is attached to the rear part of a vehicle body through a rotatable arm, and this arm is controlled to move up and down. By doing this, the rotor is grounded during agricultural work,
In addition, there is one that is lifted up when not in use, such as when traveling on a road.

The raising and lowering of the rotor is performed by a lever-type raising and lowering control switch provided in a driver's seat or the like, and by swinging a lever that interlocks with a movable contact, the arm is switched to a rising side contact, a falling side contact, or a neutral contact. Many of them are designed to be raised and lowered.

In such a lever type up / down control switch, a single click mechanism is provided by a pin-shaped sliding member that is spring-biased by a coil spring at the lever end and a guide slope on the switch case side that guides this. The lever is formed, and the lever is automatically returned to the neutral position when swinging by this click mechanism.

[Problems to be solved by the invention] By the way, since relatively large vibration is easily applied to this switch and relatively large force tends to be applied when operating the lever, it is necessary to considerably strengthen the spring of the click mechanism. There is. However, for this purpose, the coil spring must be made thicker and longer, resulting in a problem that the entire switch becomes larger.

Therefore, an object of the present invention is to provide a lifting control switch for a work implement equipped with a tractor that can be made compact.

[Means for Solving the Problems] In order to solve the above problems, the lifting control switch for a work implement equipped with a tractor according to the present invention includes a click mechanism at the lever end portion for automatically returning the rocked lever to the neutral position. This click mechanism is provided with two sliding members that are slidable on the click guide that is the guide slope, and two springs that individually urge these sliding members to press-contact the click guide. In addition, these sliding members are housed in a click holder that expands in a bifurcated shape, and two click guides are provided corresponding to each sliding member. Each click guide has an automatic position and a manual position. It is characterized in that it is formed in two steps.

[Operation of the Invention] The two sliding members that form the click mechanism are individually biased by the respective springs. For this reason, the lever is given an automatic return force to the neutral position by the elastic combined force of all springs, and is stable in the neutral position even against severe vibration.

In addition, a certain level of operation load is secured to give a good sense of moderation to lever operation. Moreover, the required strength of each spring is the strength required when a single spring is used, which is evenly divided by the number of springs used, and a smaller one is sufficient.

Moreover, by constructing the click mechanism into a bifurcated click holder and two click guides,
It becomes possible to secure the operating load at a constant level and more reliably hold the lever at the neutral position against vibration.

In addition, each click guide has a two-step staircase configuration, one for the auto position and one for the manual position.
When the lever is operated to the upside or downside, the operating load changes at each position, so that the shift position can always be recognized and the shift to the automatic position or the manual position due to a malfunction can be prevented.

[Embodiment] FIGS. 1 to 8 show an embodiment of an elevating control switch for a work implement equipped with a tractor according to the present invention. As shown in FIG. 2, the control switch 1 is provided in the vicinity of the driver's seat S of the agricultural tractor and the like, and is rotated below the rotator P pivotally attached to the rear of the tractor. The rotor R, which is rotatably attached, is grounded or is lifted and lifted above the ground.

As shown in the assembly drawing in FIG. 1 and the external appearance of the finished product in FIG. 3, the lift control switch 1 includes a knob 2, a lever 3 connected to the knob 2, and a lower end portion of the lever 3. The switch portion 4 is connected to the switch portion 4, and the switch cases 5 and 6 are formed in half and surround the switch portion 4.

As shown in FIG. 1, the switch part 4 is composed of a switch plate 7 and a swing part 8.

A click holder 10 is provided in the lower portion of the swinging portion 8, and click pins 11a and 11b are respectively provided in a pair of cylindrical portions 10a and 10b formed at the lower end portion thereof so as to spread downward in a bifurcated manner.
Are accommodated (see FIG. 4).

The click pins 11a and 11b correspond to the sliding member of the present invention, and are biased by coil springs 11c (see FIG. 5) so as to project outward.

Also, of the click holder 10, the click pins 11a and 1
A pin 12 is formed at an intermediate portion of 1b and a boss 13 is formed at a central portion thereof so as to project toward the switch plate 7.

On the other hand, the switch plate 7 is formed with a recess 14 for accommodating the boss 13. A spring 15 (see FIG. 5) is fitted in the boss 13 and urges the lever 3 to stand upright.

In addition, an arc groove 16 is formed on the switch plate 7 along the trajectory of rotation of the pin 12, and the switch body 17 is formed in the arc groove 16.
The slider 17a of (1) faces (see FIG. 6).

The tip of the pin 12 is engaged with the slider 17a,
With the movement of 2, the slider 17a is linearly movable in the left-right direction. The switch body 17 is connected with a cord 18 which goes out through the cases 5 and 6. A substantially V-shaped click guide 19 is formed at the lower end of the switch plate 7 corresponding to the pair of click pins 11a and 11b (see FIG. 4).

The click guide 19 has a substantially V-shaped central bent portion 19c located at each corner of the lower end of the switch plate 7, and each side is arranged in a diagonal horizontal direction and a diagonal vertical direction, and each side is an outer side. In addition, a stepped portion 19a is formed in two steps and a stepped portion 19a is formed on the side of the central bent portion 19c.

Further, the rocking part 8 has a base part on the upper part of the click holder 10.
20 is pivotally attached by the shaft 21, and the base 20 is urged to rotate in the counterclockwise direction in FIG. 5 by the spring 15. However, since the base 20 comes into contact with the plate 22 and rotation is restricted, the lever 3 is erected upright. Is in a state. The lower portion of the lever 3 is integrated with the base 20. The upper part of the lever 3 extends upwards and the knob 2
Connected with.

The oscillating portion 8 is integrated with the switch plate 7 by screwing the plate 22 to the boss 7a formed on the switch plate 7 so as to project therefrom. Therefore, the lever 3 has a boss 13 and a recess.
The click pins 11a and 11b can be swung about the fitting portion of 14 and can be swung about a shaft 21 in a plane orthogonal to the swing plane of the click pins 11a and 11b.

The lever 3 has a prismatic shape with a substantially square cross section, and is screwed so as to cover an opening formed in an upper part of the switch cases 5 and 6 when the switch cases 5 and 6 are combined.
It passes vertically through the guide groove 24 of 23 and is covered by the rubber boot 9 between the knob 2 and the guide plate 23.

The guide groove 24 has a crank shape as shown in FIG. 1, and has an ascending side groove 24a for guiding the movement of the lever 3 to the ascending side position for closing the ascending side switch, and a descending side position for the descending side switch. The lower groove 24b guides the movement of the lever 3 and the neutral groove 24c formed at the neutral position of the lever 3.

The neutral groove 24c connects the ascending side groove 24a and the descending side groove 24b at a neutral position of the lever so as to be orthogonal to each other, so that the movement of the lever 3 is moderated at the neutral position.

The ascending side groove 24a and the descending side groove 24b are parallel to each other and are separated by the length of the neutral groove 24c, and the length of the neutral groove 24c is the ascending side groove 24c.
It is equal to or more than the sum of the widths of a and the descending groove 24b.

Therefore, when the lever 3 is in the neutral state, the lever 3 comes into contact with the wall portion of the change groove 24c facing the ascending side groove 24a and comes into contact with the descending side groove 24b.
The swinging to the side is restricted so as not to be performed by one operation, and the closing of the descending side switch due to an erroneous operation is prevented.

As shown in FIG. 6, the switch body 17 has a slider 17a.
The movable contact 17b provided on the switch and three types of fixed contacts (see FIG. 7) fixed to the switch body 17 side so that the movable contact 17b can be contacted and separated, as shown in FIG. A contact B, a manual contact D, an ascending side auto contact A and a descending side auto contact C.

7 and 8 show the fixed contact structure of the switch body 17, and FIG. 7 shows the moving angle of the knob 2 and each fixed contact A.
7 to D, and FIG. 7 is shown for convenience in order to facilitate understanding of the relationship between the swing angle of the knob 2 and contact contact.

The actual fixed contacts A to D are on the opposite side of the knob 2 with respect to the swing center of the lever 3, and are linearly arranged corresponding to a slider that moves linearly. FIG. 8 is a connection diagram of each of these fixed contacts.

Next, the operation of this embodiment will be described. First, when the knob 2 is released, the click pins 11a and 11b are respectively caused by the springs 11c to move the central bent portions 19c of the click guides 19c.
Therefore, the lever 3 is in the neutral position N, the movable contact 17b is connected to both the ground side contact B and the manual contact D, and is in the neutral state in which no control signal is issued.

Next, when the knob 2 is swung in the counterclockwise direction in FIGS. 5 and 7 (corresponding to the case where the knob 2 is moved to the ascending side groove 24a side), the click pins 11a and 11b respectively move to the side of the click guide 19. Lower part 19b of the direction part and the vertical part
When reaching the upper side, ground side contact B, manual contact D
Then, the ascending side auto contact A is connected, the manual ascending position b is reached, and the ascending side switch is turned on (see FIG. 8).

In this state, the rising signal of the rotating portion P is generated only while the knob 2 is tilted. When you release Knob 2 at the appropriate time,
Lever 3 has springs 11c for click pins 11a and 11b
It returns to the neutral position N by the resultant force of the restoring force, and the ascending stops at that stage.

When the knob 2 is further swung counterclockwise from the manual raised position b and the click pins 11a and 11b are mounted on the high portions 19a of the click guides 19, respectively, the movable contact 17b is disengaged from the manual contact D, The rising side auto position d (see FIG. 8) is connected only to the rising side auto contact A and the ground side contact B.

In this state, an auto holding circuit (not shown) issues an auto signal. After that, even if the knob 2 returns to the neutral position N by releasing the hand, the state in which the raising signal is generated is maintained until the raising of the rotating portion P is completed.

Conversely, when the knob 2 is swung in the clockwise direction from the neutral position N, the click pins 11a and 11b similarly move on the respective click guides 19, and the manual lowering position a side or the lowering side automatic position c (7th position). And FIG. 8)).

Thus, in this embodiment, the click pins 11a and 11b
Since they are configured as a pair, a sufficient amount of force for automatically returning the lever 3 to the neutral position N is given as a resultant force of restoring elasticity of each spring 11c of the click pins 11a and 11b.

Therefore, the lever 3 can be surely automatically returned, and a predetermined operation load can be secured, so that a stable state can be maintained even under severe vibration, and the lever 3 is less likely to swing carelessly.

In addition, the strength of each spring 11c is approximately half the required strength, so a small diameter and small size are sufficient. Therefore, since the click holder 10 can be made small, the entire switch can be made compact.

Moreover, by constructing the click mechanism by the click holder 10 that expands in a bifurcated manner and the two click guides 19, the operating load of the lever 3 is maintained at a constant level, and the lever 3 is in the neutral position against vibration. It becomes possible to hold more securely.

In addition, each click guide 19 has a high portion 19a, which is the automatic position, and a low portion 19b, which is the manual position.
Since it is configured in two steps, the operating load changes at each position when operating the lever 3 to the upside or downside, so the shift position can always be recognized, and the automatic position or the manual position due to a malfunction may occur. Can be prevented.

[Advantage of the Invention] Since the lifting control switch of the work implement equipped with the tractor according to the present invention is provided with two sliding members at the end of the lever and two springs for urging the sliding members, a single spring. Although each spring can be much smaller compared to the case of using the springs of (1), it can automatically return the lever to the neutral position and stabilize it at this position even when violent vibration is applied, and at a certain level. It is possible to secure the operation load of and to give a good moderation feeling to the lever operation. Therefore, the entire switch can be made compact.

Moreover, by constructing the click mechanism into a bifurcated click holder and two click guides,
It becomes possible to secure the operating load at a constant level and more reliably hold the lever at the neutral position against vibration.

In addition, each click guide has a two-step staircase configuration, one for the auto position and one for the manual position.
When the lever is operated to the upside or downside, the operating load changes at each position, so that the shift position can always be recognized and the shift to the automatic position or the manual position due to a malfunction can be prevented.

[Brief description of drawings]

1 to 8 show an embodiment, FIG. 1 is a developed view, FIG. 2 is a conceptual view of a state of use, FIG. 3 is an external view, and FIG. 4 is an internal view except a part of a case. The side view shown in FIG. 5, FIG. 5 is a vertical sectional view, FIG. 6 is an enlarged sectional view of a main part, FIG. 7 is a fixed contact configuration diagram, and FIG. 8 is a contact connection diagram. (Explanation of symbols) 1 ... Elevating control switch, 2 ... Knob, 3 ... Lever, 7 ... Switch plate, 8 ... Swing portion, 11a / 11b ... Click pin (sliding member), 11c ... Spring, 17 ... Switch body , 19 ... Click guide.

Claims (1)

[Scope of utility model registration request] In order to control the work implement mounted on the tractor to move up and down, the movable contact can be changed over to contact either the ascending side contact, the descending side contact or the neutral contact by swinging the lever, and swinging. In a device provided with a click mechanism for automatically returning the lever to a neutral position, the click mechanism includes two sliding members slidably provided on a lever end portion on a click guide that is a guide slope, These sliding members are provided with two springs that individually urge the sliding members to press-contact the click guides.
These sliding members are accommodated in a click holder that expands in a bifurcated manner, and two click guides are provided for each sliding member. Each click guide has two stages, an automatic position and a manual position. An elevating control switch for a work implement equipped with a tractor, which is formed in a stepped shape.