JP3326364B2 - Work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch having an operation member which can be switched between an operating position for enabling power supply to a spark plug and a stop position for stopping power supply to the spark plug, and an engine. With a recoil starter that starts, the engine is started by operating the starter with the operating member set to the operating position,
The present invention relates to an improvement of a working machine that stops an engine by operating an operation member to a stop position in an engine operating state.

[0002]

2. Description of the Related Art In a working machine constructed as described above, conventionally, an operating member is formed in a knob shape which can be switched between an operating position and a stop position by a rotating operation. The starter was operated with the knob-shaped operation member set to the operating position.

[0003]

However, in the case of a small working machine such as a management machine, if the operating member of the switch can be switched to the operating position by a simple operation, for example, a child or a toddler can use it for an adult. The starter may be operated by imitating the operation and operating the operating tool to the operating position, and the engine may be started by such operation, so there is room for improvement.

[0004] It is an object of the present invention to rationally configure a working machine in which an engine is not started even if a child or an infant tries to start the engine mischievously.

[0005]

According to a first aspect of the present invention, as described at the outset, an operating position for enabling power supply to a spark plug and a power supply to the spark plug are provided. A switch having an operation member that can be switched to a stop position to prevent, and a recoil starter that starts the engine are provided, and the engine is started by operating the starter with the operation member set to the operation position, in the working machine to perform the stop of the engine operation to stop the position of the operating member in the engine operating condition, the said operating member
Structured so that the position can be held at each of the operating position and the stop position
The operating member in the position release released state to the operating position.
A biasing means for biasing from the side to the stop position side is provided, and in a state where the operation member is at the stop position, a position holding release direction set in advance from this stop position and a direction different from the direction. an operation regulating mechanism that permits movement of the operating position of the operating member after the operation in multiple operating procedure, said operating member
When the operating member is in the operating position,
To the stop position
The left and right handles
The switch is provided on the connection support member that connects the inter-portions , and its operation and effect are as follows.

According to a second feature of the present invention (claim 2), in claim 1, the operating member is capable of moving back and forth with respect to the switch body and rotating about an axis parallel to the moving direction. While being movably supported, the operation restricting mechanism pushes the operating member at the stop position by a set amount in the retracting direction, and in this pushed state, a predetermined amount is set around the axis center by the set amount. It is configured to allow movement to the operating position by rotating in the direction, and the operation and effect are as follows.

According to the first feature, when the engine is started, the starter is operated by operating the operating member of the switch from the stop position to the operating position through a plurality of operating procedures and then operating the starter. Start is possible. In other words, in comparison with the case where the operating member is operated from the stop position to the operating position by operating the operating member in one action, the operating member is determined in the determined direction even when the operating member is operated from the stop position to the operating position.
After operating the specified amount,
It is necessary to operate, and since it is operated to the operating position by performing multiple operations with a conscious and determined procedure, it is possible to prevent children and infants from operating to the operating position. Become.

According to the second feature, the operating member is operated from the stop position to the operating position by a rotation operation, but prior to this operation, the pushing direction is completely different from the operating direction to the operating position. The operation mode is set so as to perform the turning operation while maintaining the pushed state, so that the operation mode is not so difficult for adults, but difficult for children and infants. Becomes

[0009] [Effect of the Invention] Accordingly, which never children and infants also engine starts trying start the engine mischief working machine is rationally configured, if an emergency stop the engine
It is also possible to make a quick stop (claim
1). In addition, difficult to perform the engine start-up by children and infants of mischief without feeling the difficulty of the operation against adult
(Claim 2).

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, an engine 1 is disposed at a front position, a transmission case 2 in a vertically long position is disposed at a center position, and a plow having a plurality of plowing claws at a lower end position of the transmission case 2. The raising device 3 is arranged to be driven by the drive shaft 2A at the lower end of the transmission case 2, and is provided with a pair of left and right handles 4 and 4 from the center toward the rear, thereby forming a management machine as an example of a working machine. .

The engine 1 is supported by a frame 5 fixed at a front position of the transmission case 2 and a belt transmission mechanism A for transmitting power from the engine 1 to an upper portion of the transmission case 2 is provided on a left side of the body. provided on, the left side position to the upper position of the transmission case 2 is provided in a state where the shift lever 6 attitude towards the rear to insert the lever guide 7,
A hitch 9 for supporting a resistance rod, a rotary tilling device, and the like is formed at a rear surface position of the transmission case 2.
A power generation unit D for supplying electric power to the ignition plug P is disposed inside a flywheel (not shown) on the right side of the vehicle, and a recoil starter 11 is disposed outside the flywheel, and a rope 11A of the starter 11 is provided. A locking member 12 for holding a knob 11B provided at the end is formed on the right handle 4. In addition, the engine 1 is supported in an oblique posture in which a cylinder portion is directed upward and rearward of the fuselage, and includes the ignition plug P with respect to a cylinder head.

Also, grips 4A, 4A are formed at the ends of the left and right handles 4, 4, and a throttle lever 13 for setting the rotation speed of the engine 1 is provided near the grip 4A of the right handle 4. A main clutch lever 15 is provided at a position near the grip 4A of the left handle 4 so as to be operated between an "on" position and an "off" position while being guided by a lever guide 14 (see FIG. 3). Further, an intermediate frame 16 is provided at an intermediate portion between the left and right handles 4 and 4 to be welded and connected to each other, and an engine is mounted on a support plate 17 fixed at a central position of the intermediate frame 16 in the left and right direction. 1 is provided with a switch SW for enabling the start and stop of the switch. In addition, with the intermediate frame
16 and the support plate 17 constitute a connection support member
Have been.

As shown in FIG. 3, the belt transmission mechanism A
Is an output pulley 1 that rotates integrally with the output shaft 1A of the engine 1.
8, an input pulley 19 that rotates integrally with the input shaft 2 </ b> B of the transmission case 2, an endless belt 20 wound around these, and a tension pulley 21 also used as the main clutch C. The tension pulley 21 is rotatably supported by a swinging end of a tension arm 23 swingable about a support shaft 22 in a laterally oriented posture. Is connected via a spring 25. or,
The other end of the wire 24 is connected to the arc-shaped link member 2.
6 is linked to the main clutch lever 15. As shown in FIG. 3 and FIG.
A contact piece 23A is formed on the side opposite to the support shaft, and a clutch switch 27 that is switched by contact with the contact piece 23A is provided on the machine body side. The clutch switch 27 is turned off when the main clutch C is engaged (the belt transmission mechanism A transmits power) and the clutch switch 27 is disengaged (the belt transmission mechanism A does not transmit power). ), The conduction state is “ON”.

In this management machine, the operation mode of the switch SW is set so that the engine 1 is not easily started even if the child or the infant operates the starter. That is, as shown in FIG. 5, the switch SW is connected to the support plate 17.
The switch body SWB is fitted with and supported by an operator, and an operation member 28 which is manually operated by an operator is provided. The operation member 28 is formed into a circular knob shape as shown in FIG. Is supported so as to be freely rotatable around the axis X at the center position of the center position and to be able to move back and forth in the direction along the axis X. The switch SW has an operation position “ON” for enabling power supply to the ignition plug P by operation of the operation member 28 about the axis X, and a stop position for preventing power supply to the ignition plug P. It is configured to be freely switchable between two states of "OFF", and when operating from the stop position "OFF" to the operating position "ON", the operating member 28 is moved to the axis X prior to this operation.
When the operating force is released while operating in the operating position "ON", the operating member 28 is operated by pushing the operating member in the direction and rotating it while maintaining the pressed state. Is lifted upward while being held at the operating position “ON”. The operation restricting mechanism B is a mechanism that allows the operation from the stop position “OFF” to the operation position “ON” by the two-stage operation as described above.

As shown in FIG. 5, the switch body SWB has a hollow cylindrical member 29, a bottom wall member 30 for closing the bottom of the cylindrical member 29, and a rotatable rotation about the axis X. The operating member 28 is supported at the upper end of a shaft member 32 that is slidably supported along the axis X with respect to the cylindrical member 29. The fitting piece 32A at the lower end of the shaft-like member 32 and the fitting recess 31A of the rotating member 31 are fitted so as to be slidable and capable of transmitting a rotational force, and are attached in a direction to separate them from each other. Compression coil spring 3 for applying force
3 and a helical spring 34 as urging means for applying a rotational urging force around the axis X between the rotating member 31 and the cylindrical member 29. Electrical contacts 35, 35, 36 are provided between the member 31 and the operation regulating mechanism B is provided between the shaft member 29 and the cylindrical member 32.

The electric contacts 35, 35, 36 are connected to the pair of electric contacts 35, 35 of the bottom wall member 30 as shown in FIG. On the other hand, when the electric contact 36 that rotates integrally with the rotating member 31 does not contact, the non-conductive state is maintained, and when the operating member is at the stop position “OFF”, as shown in FIG. 30 and a pair of rotating members 3 with respect to the upper surfaces of the pair of electrical contacts 35, 35, respectively.
The electric contact 36 that rotates integrally with the contact member 1 is configured to contact the electric contact 35 and the electric contact 35 so that the pair of electric contacts 35 are in a conductive state. As shown in a developed view of FIG. The cam piece 32B is engaged with a cam groove 29A formed in the cylindrical member 29. The cam groove 29A allows the cam piece 32B to move in the axial direction with the operation member in the stop position "OFF". The first groove portion G1 in the vertical position to allow, the second groove portion G2 in the horizontal position to allow the cam piece 32B to rotate around the axis X in a state where the operating member is pushed, and the operating member 28 is in the operating position “ON”. And a third groove portion G3 in a vertical position that allows the cam piece 32B to move in the lifting direction in the state where the pressure has reached.

As shown in FIG. 8, an electric circuit for supplying electric power to the ignition plug P is formed. In this circuit, a conduction system for supplying electric power from the power generation unit D to the ignition plug P is formed. And a control unit E for controlling the power generation of the power generation unit D. The power generation unit D sets the timing of the power generated by the rotation of the magnet (not shown) by the switching unit 41 and sets the primary power of the transformer. The control unit E is configured to be guided to the coil on the secondary side and to increase the voltage by the coil on the secondary side. And a control circuit 42 electrically connected to the clutch switch 27.

When the engine 1 is started, the operating member 28 of the switch SW is operated from the stop position "off" to the operating position "on" by the two-action operation as described above, and the main clutch lever 15 When the knob 11B of the starter 11 is pulled and operated in a state where is turned to the cut position, power is supplied to the ignition plug P and the engine 1 can be started. After the engine 1 is started in this way, Switch SW to stop engine 1
When the operating member 28 is pushed in, the operating member 28 is automatically rotated to the stop position "OFF" by the urging force of the vine winding spring 34, and in this case, the switch SW is turned on. As a result, the primary side of the transformer of the power generation unit D is grounded. As a result, no high voltage is generated in the transformer, and the engine 1 stops. If the clutch switch 27 is ON when the engine 1 is started, the primary side of the transformer of the power generation unit D is not grounded, so that the transformer generates a high voltage and the ignition plug P
At the same time, and after the engine 1 is started, even if the clutch switch 27 is turned off, the primary side of the transformer of the power generation unit D is maintained at a high voltage generating state to ignite with the ignition plug P. If the clutch switch 27 is in the OFF state when the engine 1 is started, the primary side of the transformer of the power generation unit D is grounded via the thyristor TH to prevent generation of a high voltage in the transformer, and Operation is set to prevent starting.

As described above, according to the present invention, the switch SW that enables the start of the engine 1 is configured to require a plurality of operations in a predetermined procedure, so that the child or the infant can mischievously operate the starter 11. Even when the engine 1 is stopped, the operation member 28 of the switch SW can be pushed and operated even when the engine 1 is stopped, and the engine can be stopped quickly and easily in an emergency. Has become.

[Other Embodiments] The present invention can be configured as follows, for example, in addition to the above embodiment.

(A) The operation restricting mechanism is configured so that three or more action operations are required when the switch is operated from the stop position “OFF” to the operation position “ON”.

(B) When the switch is operated from the stop position "off" to the operating position "on", the operating member is operated by a set amount in a set direction, and then from the operated position in a direction different from the set direction. The operation restricting mechanism is configured to operate by the set amount.

(C) When the switch is operated from the stop position "OFF" to the operating position "ON", the operating member is operated by a set amount in a set direction, and thereafter, from the operated position in the same direction as the set direction. The operation restricting mechanism is configured to operate by the set amount.

[Brief description of the drawings]

FIG. 1 is an overall side view of a management machine.

FIG. 2 is an overall plan view of the management machine.

FIG. 3 is a side view of an operation system of a main clutch.

FIG. 4 is a longitudinal sectional view showing an arrangement of a main clutch switch.

FIG. 5 is a vertical sectional view of a switch in an off position and an on position.

FIG. 6 is a plan view of an operation member.

FIG. 7 is a development view of an operation regulating mechanism.

FIG. 8 is an electric circuit diagram for a spark plug.

[Explanation of symbols]

 Reference Signs List 1 engine 11 starter 28 operating member 34 biasing means B operation restricting mechanism P spark plug SW switch SWB switch body X axis

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shinichi Takeda 64 Ishizukita-cho, Sakai-shi, Osaka Kubota Sakai Works Co., Ltd. (56) References 43367 (JP, U) Japanese Utility Model 63-39069 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02P 11/40 B60R 16/02 H01H 3/20 B60R 25/00

Claims (2)

(57) [Claims] A switch having an operation member that can be switched between an operating position enabling power supply to the spark plug and a stop position preventing power supply to the spark plug;
A starter of a recoil type for starting the engine, the engine is started by operating the starter with the operating member set to the operating position, and the engine is operated by operating the operating member to the stop position in the operating state of the engine. A working machine that performs a stop, wherein the operating member is moved at each of the operating position and the stop position.
In addition to being configured to be able to hold the position,
A biasing hand that biases the operating member from the operating position to the stop position
A step is provided, and in a state where the operation member is at the stop position, a position holding release direction set in advance from the stop position and
An operation regulating mechanism that allows the operation member to move to the operating position after performing the operation in a plurality of operation procedures in directions different from the operating member, wherein the operating member is in the operating position,
Is operated in the direction to release the position holding,
It is configured to automatically restore to the stop position,
In front of the connecting support member that connects the middle part of the left and right handles
A work machine equipped with a switch . 2. The operation member according to claim 1, wherein the operation member is supported to be able to move back and forth with respect to the switch body and to be rotatable around an axis parallel to the movement direction.
The operating member at the stop position is pushed in by the set amount in the retracting direction, and in the pushed state, the operating member is turned around the axis by the set amount in the predetermined direction to move to the operating position. The work machine according to claim 1, wherein the work machine is configured to allow the following.