JPH0956201A - Safety device for tending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit the shift of a change lever to a position to accelerate a machine body exceeding the legal limit speed in the case of working on a field while directing a steering wheel opposite to the rotary. SOLUTION: A back restriction piece 28a and a back speed restriction piece 28b are placed in a state gyrating in the movable range of a tilting rod 24 in a freely protrusible and retractable manner. The pieces 28a and 28b are fixed to an L-shaped rod 27 with a phase difference. In the case of performing a field work while moving the worker backward by directing a steering wheel toward the front side of the managing machine, a stopper shaft is fit in a hole and the back speed restriction piece 28b is moved to the movable range of the tilting rod 24 to inhibit the shift of the tilting rod 24 to the high-speed forwarding position and restrict the traveling speed. When the rotary is rotated by tilting a clutch lever forward, the back restriction piece 28a is moved to the movable range of the tilting rod 24 to inhibit the shift of the speed change lever 21 to the retreating position. When the clutch lever is pulled toward the worker to stop the rotary, the speed change lever 21 can be shifted to the backing position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device which is attached to a management machine capable of rotating a handle in the front-rear direction and limits the traveling speed within a certain limit when the handle is rotated forward of the machine body to move forward.

[0002]

In a small-sized management machine that performs management work such as tilling and weeding, a worker grips a handle and walks while adjusting to the speed of the machine body.

Many of such management machines are capable of changing the direction of the handle before and after the machine body. In that case, since the worker stands on the handle side with the body facing the machine, the forward direction of the machine when the handle is directed rearward is the backward direction for the worker when the handle is directed forward. That is, when the body is moved forward with the handle facing the front of the body, the worker walks while retreating in front of the body.
Such backward walking in the field is much slower than forward facing, so if the aircraft is advanced at high speed, it will not be able to keep pace with the speed of the aircraft, and it will be pushed down by the forward aircraft and injured unexpectedly. There is danger. The present invention eliminates such a danger, and an object of the present invention is to limit the speed of the machine body within a certain limit so as not to increase the speed when advancing the machine body with the handle in front of the machine body. To do.

[0004]

In order to achieve the above object, the invention according to claim 1 is a management machine in which the direction of a handle can be changed to either the front or the rear of a machine body, and a shift lever is connected to a shifter operation member of a transmission. Then, a back speed regulator that can be retracted and retracted is provided in the moving range of the shifter operating member, and the back speed regulator is fixed within the moving range of the shifter operating member by the restrainer position holding means to shift the shifter operating member to the high speed forward position. It is characterized by blocking the movement of.

According to a second aspect of the present invention, in a management machine capable of changing the direction of the handle either forward or backward of the machine body, a shift lever is connected to a shifter operating member of a transmission so that the shifter operating member can freely move in and out within a range of movement of the shifter operating member. A back regulator and a back speed regulator are provided, and when the clutch lever that engages and disengages the rotary is connected to the back regulator and the back speed regulator, and the clutch lever is engaged,
The back restrictor is moved into the movement range of the shifter operating member to prevent the gear shift lever from switching to the retracted position, and when the gear shift lever is in the retracted position, the shifter operating member stops the movement of the back restrictor to stop the rotary lever. The shifter is moved to the high-speed forward position by blocking entry and fixing the back speed regulator within the moving range of the shifter operating member by the restrainer position holding means and fixing the back regulator outside the moving range of the shifter operating member. It is characterized in that the movement of the operating member is prevented and the rotary can be freely opened and closed.

[0006]

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

A management machine 11 equipped with the safety device 10 of the present invention
Has an engine 12 arranged in the front of the machine body, and a transmission 13 having two forward stages and one reverse stage disposed behind the engine 12. W is a pair of left and right wheels for transmission 1
3 is connected to the output side.

A rotary transmission 14 at the rear of the machine body is connected to the transmission 13 via a chain, and a rotary 15 is connected to the rotary transmission 14 via a chain. Then, the base of the handle 16 is attached to the center of the machine body so as to be rotatable back and forth, and the clutch lever 17 is arranged near the grip of the handle 16.

The safety device 10 comprises a back restricting portion 18 and a rotary changing portion 19. First, the back restricting portion 18 is provided.
Will be described.

A transmission lever 21 is provided near the case 20 of the transmission 13. Reference numeral 22 denotes a lever support fixed to the machine body, which rotatably supports the base portion of the speed change lever 21. This gear shift lever 21 has a handle 16
Similarly, you can change the direction of the aircraft in the front-back direction.

The lever support 22 is provided with an oscillating plate 23 which turns together with the speed change lever 21, and the oscillating plate 23 is provided.
One end of the swing rod 24 is fixed to the tip of the. A rod engaging portion 24a is provided at the other end of the swing rod 24, and the swing link 25 is connected to the rod engaging portion 24a. Swing link 25
The swing shaft 26 is fixed to the shift shaft 26, and the swing shaft 26 is connected to a shifter (not shown) in the transmission 13.

Here, the lever support 22, the swing plate 23, the swing rod 24, the rod engaging portion 24a and the swing link 25 constitute a shifter operating member.

Further, an L-shaped rod 27 is provided in the transmission 13 in the lateral direction of the case 20, and a bent portion 27a of the L-shaped rod 27 is projected outside the case 20.

A back regulator 28a and a back speed regulator 28b having the same shape are fixed to the L-shaped rod 27 with a phase difference (see FIGS. 2 and 3). The L-shaped rod 27 is biased in the D direction by a spring (not shown).

A fork connecting plate 29, one end of which is fixed to the L-shaped rod 27, is arranged on the side surface of the case 20 of the transmission 13 opposite to the gear shift lever 21. The pin shaft 30 at the other end of the fork connecting plate 29 is slidably inserted into the long hole 32 of the fork member 31 (see FIG. 4).

Further, the stopper shaft 3 is attached to the fork connecting plate 29.
4 is attached, and the disk-shaped knob 33 is attached to one end of the stopper shaft 34.
To fix. Attach the spring 34a to the stopper shaft 34,
The stopper shaft 34 is directed toward the side surface of the case 20 by the spring 34a.
Energize. Further, a hole portion 35 with which the stopper shaft 34 is engaged is formed in the case 20 (see FIG. 5).

Here, the knob 33, the stopper shaft 34, and the spring 34a constitute a restrictor position holding means.

One end of the back regulating wire 36 is locked to the end of the fork member 31, and the other end of the back regulating wire 36 is connected to the wire connecting member 38 (see FIGS. 4 and 6). The wire connecting member 38 is connected to a lever fixing plate 37 that is integral with the clutch lever 17.

Next, the rotary change section 19 will be described.

A rotary change portion 19 is provided above the rotary transmission 14, and an input / cut rod 39 for moving a shifter (not shown) of the rotary transmission 14 is rotatably projected from the case of the rotary transmission 14.
The swing rod 40 is fixed to the tip of the on / off rod 39, and one end of the rotary change wire 41 is connected to the end of the swing rod 40. Then, the other end of the rotary change wire 41 is connected to the lever fixing plate 37 (see FIGS. 6 and 7).

Next, the operation will be described.

First, when the clutch lever 17 is tilted forward (solid line in FIG. 6), the back restriction wire 36 pulls the fork member 31 in the A direction, and pulls the pin shaft 30 through the elongated hole 32 (FIG. 4). (See the one-dot chain line).

Then, the tip of the bent portion 27a is rotated about the L-shaped rod 27 in the direction of the arrow B, and at the same time, the back restrictor 28a is rotated together with the L-shaped rod 27. At this time, the back restrictor 28a enters the moving range of the rod engaging portion 24a of the swing rod 24 (see the back restrictor 2 in FIG. 2).
The back speed regulator 28b is located outside the moving range of the rod engaging portion 24a (see FIG. 3).
1).

Therefore, the rod engaging portion 24a comes into contact with the back restrictor 28a, and the gear shift lever 21 cannot be switched to the retracted position (one-dot chain line in FIG. 2).

At this time, the rotary change wire 41 is relaxed in the direction E of FIG. 7, and the rocking rod 40 is struck by the elastic force of the spring.
The rotary transmission 14 is turned on and the rotary 15 is turned by turning the turning on / off rod 39 (see FIG. 7).

Next, when the clutch lever 17 is pulled toward you (one-dot chain line in FIG. 6), the back regulating wire 36 relaxes to move the fork member 31 in the C direction, and the L-shaped rod 27.
The tip of the bent portion 27a is rotated in the D direction (see FIG. 4).

Then, the back restrictor 28a and the back speed restrictor 28b are swung to escape out of the moving range of the rod engaging portion 24a (solid line in FIG. 3). In this state, the shift lever 21 is arbitrarily switched to the retracted position.

Further, by pulling the clutch lever 17 toward you, the rotary change wire 41 is pulled in the F direction in FIG. 7 to turn off the rotary transmission 14, and the rotation of the rotary 15 is stopped.

When the handle 16 is rotated in front of the machine body (in the direction opposite to the rotary 15 side) for work, the knob 3 is used.
3 to pull the stopper shaft 3 together with the fork connecting plate 29.
4, the stopper shaft 34 is engaged with the hole 35 of the case 20. As a result, the bent portion 27a largely rotates in the direction of the arrow B around the L-shaped rod 27 (two-dot chain line in FIG. 4), and the back restrictor 28a moves beyond the moving range of the rod engaging portion 24a and is outside of it. Move and back speed regulator 28
b enters the moving range of the rod engaging portion 24a (see FIG. 3).
(Two-dot chain line).

Therefore, even if the shift lever 21 is switched to the high speed side, the rod engaging portion 24a comes into contact with the back speed regulator 28b and does not enter the high speed forward side (2 of the back speed regulator 28b in FIG. 2). (See dotted line).

As described above, in the safety device 10 according to the first aspect of the present invention, when the handle 16 is rotated forward (on the side opposite to the rotary 15), the stopper shaft 34 is engaged with the hole 35. The back speed regulator 28b is moved within the movement range of the rod engaging portion 24a. Then, the speed change lever 21 is prevented from being switched to the high speed forward side, and the speed is limited to the legal speed.

The safety device 10 according to the second aspect of the present invention.
In the case of the
When the rotary 15 is rotated, the gear shift lever 21 is prevented from entering the retracted position while the rotary 15 is rotating, and the rotary 15 is not rotated when it is in the retracted position. Therefore, there is no possibility that the foot will come into contact with the rotary 15, and the work can be performed safely.

[0033]

As described above, according to the first aspect of the invention, when the handle is rotated in the opposite direction to the rotary side and is directed toward the front of the machine, the operator limits the speed to a fixed legal speed and Work safely when walking backwards.

According to the second aspect of the present invention, when the handle is directed to the rotary side, the shift lever is prevented from entering the retracted position while the rotary is rotating, and when the shift lever is in the retracted position, the rotary lever is not retracted. Prevent the rotation of. As a result, the work can be performed safely without the risk of the operator's foot coming into contact with the rotating rotary.

[Brief description of drawings]

FIG. 1 is an overall side view of a management machine embodying the present invention.

FIG. 2 is an enlarged sectional view of a main part of the transmission.

FIG. 3 is an operation diagram of a back regulator and a back speed regulator.

FIG. 4 is a side view of a fork connecting plate and a fork member.

FIG. 5 is a plan view of a restrictor position holding unit.

FIG. 6 is an enlarged side view of a clutch lever.

FIG. 7 is a partially omitted plan view of a rotary transmission.

[Explanation of symbols]

 10 Safety Device 11 Management Machine 13 Transmission 14 Rotary Transmission 16 Handle 17 Clutch Lever 21 Gear Shift Lever 22 Lever Support 23 Rocking Plate 24 Rocking Rod 25 Rocking Link 27 L-Shaped Rod 28a Back Regulator 28b Back Speed Regulator 29 Fork connecting plate 31 Fork member 34 Stopper shaft 36 Back regulating wire 41 Rotary change wire

Claims (2)

[Claims] 1. A management machine capable of changing the direction of a handle either forward or backward of a machine body, wherein a shift lever is connected to a shifter operation member of a transmission, and a back speed restrictor which can be retracted and retracted in a movement range of the shifter operation member is provided. A safety device for a management machine, characterized in that a back speed regulator is fixed within a moving range of a shifter operating member by a restrainer position holding means to prevent the shifter operating member from moving to a high speed forward position. 2. In a control machine capable of changing the direction of the handle either before or after the machine body, a shift lever is connected to a shifter operation member of a transmission, and a back restrainer and a back speed regulation are freely retractable in the movement range of the shifter operation member. When the clutch lever is installed, the back lever and back speed regulator are connected to the clutch lever that turns the rotary on and off, and when the clutch lever is turned on, the back regulator advances into the movement range of the shifter operating member and When switching to the reverse position is blocked and the shift lever is in the reverse position, the shifter operating member stops the movement of the back restrictor to prevent the rotary from entering, and the restrictor position holding means operates the back speed restrictor. Fasten the high-speed forward position by fixing the back restrictor inside the moving range of the member and outside the moving range of the shifter operating member. Safety device management apparatus, characterized by freely permitting and blocking rotary while preventing movement of the shifter operating member to.