JPH0974858A - Travel clutch lever of hand mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a travel clutch lever of a hand mower, capable of reducing the abrasion an damage of a clutch pawl of the travel clutch. SOLUTION: The operation wire 2 of a pawl clutch and a clutch lever 3 operated interlocking with the operation wire are interlocked with each other through a spring 6 and an operation arm 5 capable of being integrally rotated together with the clutch lever through a ratchet claw 4. A ratchet arm 7 incorporated with the ratchet claw 4 and the connection rod 8 incorporated with the operation wire 2 are interlocked with each other by the engagement of a long hole 9 with a pin 10 fit into the hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling clutch lever for operating a main clutch or a traveling clutch of a hand mower.

[0002]

2. Description of the Related Art In a hand mower for mowing grass while traveling with a steering handle, a steering handle has a clutch lever and grips the clutch lever. By doing so, when the traveling clutch of the claw clutch type or the mode in which the main clutch is engaged for mowing traveling, the traveling clutch slips due to overload during the mowing traveling, the clutch claw of the traveling clutch jumps continuously, etc. May occur easily.

[0003]

According to the present invention, an operating wire 2 of a pawl clutch 1 and a clutch lever 3 for interlocking the operating wire 2 are integrated with the clutch lever 3 via a ratchet pawl 4. A long hole 9 is fitted in the long hole 9 between the ratchet arm 7 integral with the ratchet pawl 4 and the connecting rod 8 integral with the operation wire 2 while interlocking via a rotatable operation arm 5 and a spring 6. The traveling clutch lever of the hand mower is configured to be interlocked with each other by engaging with the corresponding pin 10.

[0004]

Operation and effects of the invention: The engine is driven to pull the clutch lever 3 toward the steering handle and hold it to engage the pawl clutch 1 for transmission of the mowing traveling. At this time, the operating arm 5 is rotated via the ratchet pawl 4, the operating wire 2 is pulled via the spring 6, and the pawl clutch 1 is engaged.

Claw clutch 1 due to overload during mowing
When it slides, the operating wire 2 extends the spring 6 and pulls the connecting rod 8. When the ratchet arm 7 is rotated by the engagement of the long hole 9 and the pin 10, the ratchet pawl 4 integral with this is opened. The operating arm 5 is disengaged from the operating arm 5 side, and the operating arm 5 is also pulled by the spring 6, so that the operating wire 2 is completely loosened, regardless of whether the clutch lever 3 is engaged or not
The claw clutch 1 is in the disengaged position.

As described above, while the clutch lever 3 is being engaged with the clutch, when the pawl clutch on the traveling clutch side is about to be disengaged due to an overload of cutting traveling, the ratchet pawl 4 is automatically disengaged. The claw clutch 1
The claw clutch 1 can be reduced in wear and damage.

[0007]

EXAMPLE A hand mower is equipped with a vertical blade shaft 11
Has a blade 12 at its lower end, is axially mounted in a mower deck 13, and is driven by an engine E mounted on the mower deck 13. 14 is a drive wheel that is mounted on the rear of the vehicle
Reference numeral 5 is a gauge wheel provided in the front part. The drive wheels 14 can be driven and driven in association with each other from the engine E side. Reference numeral 16 is a transmission case in which a transmission mechanism for transmitting the drive wheels 14 is incorporated.

In the transmission mechanism to the blade shaft 11 and the drive wheels 14, a main clutch or a traveling clutch composed of the pawl clutch 1 is provided, and the clutch lever 3 in the steering handle 17 provided from the mower deck 13 to the rear side. With this operation, the claw clutch 1 is engaged and disengaged by the operation wire 2 or the like. Reference numeral 18 denotes a collector bag arranged below the control handle 17, which receives and stores the grass grass cut by the mower deck 13.

The grip portion 19 of the steering handle 17 is formed in a loop shape, and the clutch lever 3 is formed in a gate shape so as to follow this loop shape, and both left and right end portions are pinned to the bracket 20 of the steering handle 17. 21 is provided to be rotatable back and forth. The clutch lever 3 can be pivoted forward against the spring 25 to approach the grip portion 19 and grip them together.

The clutch lever 3 and the operating wire 2 are connected to each other by a ratchet pawl 4 and a ratchet arm 7.
An operating arm 5 that is integrally rotated by the ratchet claw 4, a spring 6 that connects the operating arm 5 and the operating wire 2, and a connecting rod 8 that connects the ratchet arm 7 and the operating wire 2. Etc. The ratchet pawl 4 is pivotally supported by a pin 22 on the base end side of the clutch lever 3, and is engaged by a pawl ring 24 formed around a pin 21 portion of the operation arm 5 by a spring 23. When rotating around the gripping portion 19 side A, these ratchet pawls 4 are engaged with the pawl ring 24,
The operation arm 5 integrated with 4 is rotatable around the pin 21 in the same direction. Further, when the clutch lever 3 is returned in the direction opposite to the arrow A, the ratchet pawl 4 has the pawl ring 24.
The engagement arm is disengaged from and can be rotated independently of the operation arm 5.

A ratchet arm 7 which is integral with the ratchet pawl 4 has a pin 10 at the lower end thereof, and is slidably fitted in a long hole 9 of a constant length formed along a connecting rod 8 connected to the operating wire 2. I am combining. At the lower end of the operation arm 5 which is rotatable around the pin 21, a tension spring 6 is locked by a pin 26 between the operation arm 2 and the operation wire 2, and the ratchet pawl 4 is operated by the operation A for engaging the clutch lever 3. When the operation arm 5 is rotated via the, the operation wire 2 is passed through the spring 6.
Is pulled and the traveling claw clutch 1 is turned on. At this time, some expansion and contraction of the spring 6 is absorbed by the sliding of the pin 10 and the long hole 9, and the ratchet pawl 4 engaged with the pawl ring 24 does not come off.

However, the operating wire 2 is pulled in the direction opposite to the arrow B on the claw clutch 1 side, the connecting rod 8 is moved against the spring 6, and the pin 10 is locked at the tip of the elongated hole 9. When pulled, ratchet pawl 4 resists spring 23 and pin 22
It is rotated around and disengaged from the claw ring 24. As a result, the operating arm 5 is pulled by the spring 6 and rotated about the pin 21 with respect to the clutch lever 3 operated to the engagement position A of the pawl clutch 1, and returns to the disengaged position of the pawl clutch 1. Reference numeral 27 is a stopper that locks the clutch lever 3 in the disengaged position, and is provided integrally with the bracket 20.

3 and 4 are different from the above example in that
In the transmission device of the drive wheel 14, when the pawl clutch 1 for interlocking the wheel shaft 28 slips due to overload and moves in the axial direction A, the sub-shift key 2 interlocking with this
When the gear 9 is automatically switched from the high speed gear H to the low speed gear L to increase the traveling driving force, or conversely, when the load becomes light, the pawl clutch 1 returns in the direction opposite to the arrow A, and the pawl clutch 1 The auxiliary transmission gear 29 is configured to switch from the low speed gear L to the high speed gear H in accordance with the movement of.

The transmission case 16 is provided with an auxiliary transmission 32 which is transmitted from an input shaft 30 input from the engine E side by a main clutch 31, and a wheel shaft 28.
A claw clutch 1 is provided on the top. The pawl clutch 1 is provided with a spring 33 when the drive wheel 14 receives a resistance higher than a certain level.
The clutch claws are pressed by and the engagement transmission of the clutch claws is performed.
When an overload is exerted on the wheel shaft 28 side, the power transmission causes the inclined engagement surface of the clutch pawl to slide and the pawl clutch 1 to move axially against the spring 33. As a result, the rotation of the clutch gear 34 causes the pawl clutch to rotate. Transmission to the wheel shaft 28 is performed while maintaining the entry position of 1. However, this claw clutch 1
The bell crank-shaped shifter 35 is rotated by the movement of the arm 3 against the spring 33 of the arm 3 via the link 36.
7 is rotated around the arm pin 38. The shifter arm 39 integrated with the arm pin 38 pushes the spindle 40 of the auxiliary shift key 29 to switch from the meshing position with respect to the high speed gear H to the meshing position with respect to the low speed gear L, and the drive wheel 14 is transmitted at low speed.

When the drive wheel 14 loses such an overload resistance, the pawl clutch 1 by the spring 33 is pushed back to the clutch gear 34 side, and the meshing with the clutch pawl 42 of the clutch gear 34 is maintained. But shifter 35
The sub-shift key 29 is also switched from the low speed gear L to the high speed gear H by the interlocking of, and the drive wheels 14 are driven at high speed. Reference numeral 41 is an operation wire, which is configured so that the sub gear can be manually switched by operating the arm 37 in an interlocking manner. Pulling the speed change operation wire 41 causes transmission by the low speed gear L, and returning it causes transmission by the high speed gear H. The main clutch 31
A spindle 40, which is pushed against a spring 44 by a shifter arm 39, is provided on a coaxial shaft of the speed change shaft 43 having a key. The key 29 axially moved by the spindle 40 is a key groove of the speed change shaft 43. While engaging and sliding along 45, the transmission shaft 43 and the high speed gear H are engaged with the key grooves on the inner peripheral surfaces of the freely rotatable high speed gear H and the low speed gear L on the outer periphery of the speed change shaft 43. Alternatively, the low-speed gear L is integrally rotated, and the clutch gear 34, which is constantly meshed with the low-speed gear L, is transmitted in a variable speed. Reference numeral 46 denotes a bevel gear that is constantly meshed with the pinion bevel gear 47 of the input shaft 30 and is rotatable with respect to the speed change shaft 43, and has a clutch pawl with which the main clutch 31 is meshed. The shaft 43 is rotated.

[Brief description of drawings]

FIG. 1 is a side view and a rear view of a clutch lever portion.

FIG. 2 is a side view of a hand mower.

FIG. 3 is a front view showing a partly different embodiment.

FIG. 4 is a perspective view of a part thereof.

[Explanation of symbols]

 1 Claw Clutch 2 Operation Wire 3 Clutch Lever 4 Ratchet Claw 5 Operation Arm 6 Spring 7 Ratchet Arm 8 Linking Rod 9 Long Hole 10 Pin

Claims (1)

[Claims] 1. An operating arm 5 which is integrally rotatable with respect to the clutch lever 3 via a ratchet pawl 4 between an operating wire 2 of a pawl clutch 1 and a clutch lever 3 which interlocks the operating wire 2. Engagement of a long hole 9 and a pin 10 fitted to the long hole 9 between the ratchet arm 7 integrated with the ratchet pawl 4 and the connecting rod 8 integrated with the operation wire 2 while interlocking with the spring 6. The drive clutch lever of the hand moor that is linked by.