JP3404891B2 - Operation lever holding device for walking lawn mower - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking lawn mower, and more particularly to a device for holding a mowing operation lever for engaging and disengaging a clutch for a mowing blade. It is. 2. Description of the Related Art There is a conventional walking-type lawn mower having a clutch for a mowing blade and a clutch for a traveling drive separately. The operation lever and the traveling operation lever are provided independently. The mowing operation lever is provided with a push button type lock mechanism so that the mowing operation lever cannot be operated accidentally. However, the operator sometimes unconsciously presses the push button, and at that time, the mowing operation lever is inadvertently operated and the mowing blade is suddenly rotated, which poses a problem in safety. Was. In order to solve the above problem, for example, FIG.
As shown in the figure, the mowing operation lever 1 and the wire arm 2 are separated and pivotally attached to the shaft 3, and a spring 4 is interposed between the mowing operation lever 1 and the wire arm 2 so that both are separated from each other. Is conceivable. In this configuration, when only the mowing operation lever 1 is rotated in the direction of arrow A, the wire arm 2 does not rotate and the clutch is not turned on. When the clutch for the cutting blade is turned on, the cutting operation lever 1 is first slid in the axial direction to approach the wire arm 2. next,
When the mowing operation lever 1 is rotated in the direction of arrow A in such a state, the locking piece 5 protruding from the mowing operation lever 1 is provided.
Engages with the wire arm 2 and both rotate integrally, the clutch wire 6 is pulled, and the clutch for the cutting blade is turned on. Further, as shown in FIG. 7, a configuration in which the mowing operation lever 7 is formed so as to be freely folded in two is also conceivable. The cutting operation lever 7 is divided into a base end portion 7a and a tip end portion 7b, both of which are connected by a pin 8 and urged by a spring 9 to rotate the tip end portion 7b downward. When no operation is performed, the mowing operation lever 7 is folded into two. When the clutch for the cutting blade is turned on, first, the tip 7b of the cutting operation lever is raised to be in a straight line with the base 7a. Next, when the distal end portion 7b is pressed in such a state, the entire cutting operation lever 7 rotates in the direction of arrow B, the clutch wire 10 is pulled, and the clutch for the cutting blade is turned on. The conventional mowing lever shown in FIG. 6 performs a rotating operation while sliding the gripped mowing lever in the axial direction when the clutch is turned on. Therefore, the reliability of the operation is inferior and the operating force is large. On the other hand, in the mowing operation lever shown in FIG. 7, since the cutting operation lever is further rotated in the same direction after raising the tip portion in the rotating direction, the rotating operation is complicated. Further, a large force is applied to the pin connecting the distal end portion and the proximal end portion, resulting in poor mechanical durability. [0008] In order to prevent the clutch for the mowing blade provided in the walking lawn mower from being accidentally turned on and to improve the operability when the clutch is turned on. A technical problem to be solved arises, and an object of the present invention is to solve this problem. SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and comprises a clutch for a cutting blade and a clutch for driving, and is provided at a rear portion of the body. In a walk-behind lawn mower provided with a mowing operation lever and a traveling operation lever on a handle, a bracket is fixed to the handle, and a shaft is provided in the left and right direction of the bracket, and the mowing operation lever is pivoted to this shaft. And a lock plate that is rotatable in a direction orthogonal to the rotation direction is pivotally attached to the mowing operation lever, and the lock plate is urged in a direction protruding from the mowing operation lever,
A walk-behind lawn mower provided with a stopper at a position forward of the mowing operation lever in the operation direction, wherein the stopper is in contact with the stopper when the lock plate is in a protruding state and is not in contact with the stopper when the lock plate is in a retracted state. The present invention provides an operation lever holding device. The lock plate pivotally attached to the cutting operation lever is rotatable in a direction perpendicular to the rotation direction of the cutting operation lever, and is urged in a direction protruding from the cutting operation lever. ing. Therefore, when the mowing operation lever is pressed in such a state, the lock plate in the protruding state comes into contact with the stopper provided at the front position of the mowing operation lever, and the turning operation of the mowing operation lever is prevented. . On the other hand, when the clutch for the cutting blade is turned on, while holding the cutting operation lever,
The lock plate is pressed in a direction perpendicular to the rotation direction of the mowing operation lever. If the mowing operation lever is pressed forward in such a state, the lock plate does not come into contact with the stopper portion because the lock plate is recessed inside the mowing operation lever, and the mowing operation lever is regulated. And the clutch for the cutting blade is turned on. An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 shows a walk-behind lawn mower 11, in which a mowing blade 13 is disposed at a lower center portion of an airframe 12, and an engine 14 is mounted at an upper center portion of the airframe 12. The cutting blade 13 and the engine 14 are connected by a drive shaft 15, and a clutch 16 for the cutting blade is provided in the drive shaft 15. Further, drive wheels 17 and 1 are provided at four corners of the body 12.
The power of the engine 14 is transmitted to a transmission case 20 by a universal joint 19, and the driving wheels 17 are transmitted through a traveling drive clutch 21 provided in the transmission case 20. , 17 are driven. Further, left and right handle pipes 22, 22 project from the rear portion of the body 12, and the respective rear ends are detoured upward to form a handle 23 integrally connected in a loop. Then, brackets 24 and 25 are fixedly mounted on the left and right sides of the handle 23, respectively.
6 is pivotably mounted to be able to move back and forth. The traveling drive clutch 21 and the traveling operation lever 26 are connected by a wire 27, and the traveling operation lever 26 is pressed forward to
3, the wire 27 is pulled, and the traveling drive clutch 21 is turned on. On the other hand, one end of the traveling operation lever 26 is pivotally attached to the left bracket 24 to form a shaft 28 in the left-right direction, and the mowing operation lever 29 is pivotally attached to this shaft 28 so as to be movable back and forth. The cutting operation lever 29 and the clutch 16 for the cutting blade are connected by a wire 30. Next, the mowing operation lever 29 will be further described with reference to FIGS. The illustration of the traveling operation lever 26 is omitted for convenience of explanation. In FIG. 2 and FIG. 3, the bracket 24
The cutting operation lever 29 is pivotally connected to the shaft 28. Also, the mowing operation lever 29
A pin 31 is provided at the lower end of the wire 30 and the wire 30 is locked to the pin 31. A shaft 32 protrudes from a central portion of the front surface of the mowing operation lever 29, and a lock plate 33 is pivotally mounted on the shaft 32 to lock the mowing operation lever 29 in a direction perpendicular to the rotation direction. The plate 33 is made rotatable. Further, a spring 34 is interposed on the shaft 32, and the spring 34 urges the lock plate 33 in a direction protruding from the mowing operation lever 29. A projection 33a is provided at a lower position of the lock plate 33. On the other hand, a guide 35 is fixedly provided on the upper portion of the bracket 24, and a stopper 35a is provided at the rear end of the guide 35. The stopper portion 35a is provided on the rotation locus of the lock plate 33 when the mowing operation lever 29 is pressed forward. Thus, when the cutting operation lever 29 is pressed, the cutting operation lever 29 tends to move forward with the shaft 28 as the center of rotation. However, the projection 33a of the lock plate 33 protruding from the mowing operation lever 29 comes into contact with the stopper 35a of the guide 35, and the mowing operation lever 2
9 is prevented from rotating. That is, the mowing operation lever 2
Reference numeral 9 indicates a locked state. Therefore, even if an operator accidentally comes into contact with the mowing operation lever 29, the mowing operation lever 29 is not accidentally operated, the clutch 16 for the mowing blade is turned on, and the blade 13 is moved. The danger of sudden rotation can be prevented. Here, the clutch 16 for the cutting blade is used.
Is turned on, the mowing operation lever 29 is gripped and pressed forward. At this time, the lock plate 33 is pressed toward the mowing operation lever 29 along with the gripping of the mowing operation lever 29, and the lock plate 33 is rotated about the shaft 32 in a direction orthogonal to the rotation direction of the mowing operation lever 29. Rotate. Then, as shown by a two-dot chain line in FIG. 3, the lock plate 33 is retracted inside the mowing operation lever 29, and the projection 33a rotates upward and moves to a position disengaged from the stopper 35a. In this state, when the mowing operation lever 29 is pressed forward, the projection 33a of the lock plate 33 is pressed.
Does not contact the stopper portion 35a, and the cutting operation lever 29 is rotated without being restricted. Accordingly, as shown in FIGS. 4 and 5, the cutting operation lever 29 is rotated to a position where it approaches the handle 23, the wire 30 is pulled, the clutch 16 for the cutting blade is turned on, and the cutting blade 13 is turned on. Rotates. The projection 33 of the lock plate 33
a has passed through the stopper 35a, the protrusion 33a
Is slid on the guide 35 and the mowing operation lever 2
Even if the lock 9 rotates and the pressing of the lock plate 33 is released, the state where the lock plate 33 is immersed in the mowing operation lever 29 is maintained. Here, when the rotation of the cutting blade 13 is stopped, if the forward pressing of the cutting operation lever 29 is released, the cutting operation lever 29 is rotated in a direction in which the cutting operation lever 29 is separated from the handle 23 by the return force of the wire 30. Move. At this time, the protrusion 3 of the lock plate 33
3a slides on the upper part of the guide 35, and the protrusion 33a
After passing through the stopper portion 35a, the spring 34
The lock plate 33 protrudes from the mowing operation lever 29 by the urging of. Accordingly, the state returns to the state shown in FIGS. 2 and 3, the clutch 16 for the cutting blade is turned off, and the cutting operation lever 29 is again locked. The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones. According to the present invention, as described in detail in the above-described embodiment, when the mowing operation lever is rotated, the lock lever must be turned in a direction perpendicular to the turning direction. , The reaping operation lever cannot be rotated.
That is, when two different operations are not performed at the same time, the reaping operation lever does not rotate in the locked state, and there is no possibility that the reaping operation lever is accidentally operated to cause an accident. Further, the release of the lock of the cutting operation lever can be extremely easily performed with a small operating force in accordance with the gripping operation of the cutting operation lever. Thus, the mowing operation lever of the walking lawn mower can be locked at the safe position without deteriorating the operability of the mowing operation lever, and it is possible to contribute to improvement of operability and safety.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a walking lawn mower showing an embodiment of the present invention. FIG. 2 is a side view of the cutting operation lever in a non-operation state. FIG. 3 is a rear view of the cutting operation lever in a non-operation state. FIG. 4 is a side view of a mowing operation lever in an operation state. FIG. 5 is a rear view of the cutting operation lever in an operation state. FIG. 6 is a perspective view of a conventional mowing operation lever. FIG. 7 is a side view of another conventional mowing operation lever. DESCRIPTION OF SYMBOLS 11 Walking lawn mower 12 Body 13 Cutting blade 16 Clutch for cutting blade 17 Drive wheel 21 Clutch for running drive 23 Handle 24, 25 Bracket 26 Running operating lever 28 Shaft 29 Cutting operating lever 32 Shaft 33 Lock Plate 33a Projection 34 Spring 35 Guide 35a Stopper

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-144108 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01D 34/68

Claims (1)

(57) [Claim 1] A walker having a clutch for a cutting blade and a clutch for a driving drive, and provided with a cutting operation lever and a traveling operation lever on a handle protruding from a rear portion of the body. In a lawn mower, a bracket is fixed to the handle,
A shaft is provided in the left and right direction of the bracket, the cutting operation lever is pivotally attached to the shaft, a lock plate that is rotatable on the cutting operation lever in a direction orthogonal to the rotation direction thereof is pivotally attached, and The lock plate is urged in a direction to protrude from the mowing operation lever, and a stopper portion is further provided at a front position in the operation direction of the mowing operation lever. An operating lever holding device for a walk-behind lawnmower, wherein the operating lever holding device is formed so as not to contact the stopper portion in a immersed state.