JP4801565B2 - Operating device for work machine bar handle - Google Patents

Description

  The present invention relates to an operating device for a work implement bar handle provided with a grip lever that is swingably attached to a bar handle of a walking work implement.

  As the operation device for the work machine bar handle described above, the one shown in FIGS. 6A and 6B has been developed. The operating device for the work machine bar handle developed previously includes a grip lever 40, a bracket 30 that supports the grip lever 40 so as to be swingable around the axis of the connecting pin 37, and a clamp 60. The bracket 30 includes a clamp portion 38 having a pair of bolt connection portions 38a and 38a. The clamp 60 is fastened and connected to the clamp portion 38 by two connection bolts 61 and 61, whereby the bar handle 11 is connected. Tightened and connected.

  In the case of the previously developed operating device, the size of the structure is such that the bracket is connected to the bar handle. In addition, in order to attach the grip lever to the bar handle, a troublesome connection work of tightening the two connection bolts is required.

  It is an object of the present invention to provide an operating device for a work machine bar handle that can be easily mounted with a compact mounting structure in a state in which the handle lever has good operability.

Working machine handlebar manipulation device according to the present first invention comprises a band wrapped around the bar handle of the walk-behind working machine, and a single tightening bolt connecting tightened before Symbol band to the bar handle, pivotable gripping lever And a bracket to support,
The band includes a band main body along the outer peripheral surface of the bar handle, and left and right bolt mounting portions that are connected downward on both ends of the band main body and formed with left and right bolt holes. , Forming front and rear stopper surfaces on the front and rear sides of the bolt mounting portion,
The bracket includes a bracket main body, a connecting portion made of a resin material that is connected to an upper end side of the bracket main body and enters between the pair of left and right bolt mounting portions of the band, and a left-right direction provided in the connecting portion . Comprising a mounting hole and a front and rear detent portion projecting left and right on the lateral side of the bracket body ;
The tightening bolts mounted on the pair of left and right bolt mounting portions are inserted through the mounting holes to connect the connecting portions to the band, and the front and rear anti-rotation portions are opposed to the front and rear stopper surfaces, respectively. In such a state , the band is prevented from rotating around the mounting hole of the bracket.

According to the configuration of the first aspect of the present invention, if one tightening bolt mounted on the pair of left and right bolt mounting portions of the band is inserted while the bracket mounting hole is inserted, the band is tightened to the bar handle by the tightening bolt. In addition to being connected, the connecting portion of the bracket is connected to the band, and the grip lever is swingably attached to the bar handle via the bracket and the band. Then, the front and rear anti-rotation portions are in a working state opposite to the front and rear stopper surfaces, respectively, and the rotation of the band around the mounting hole of the bracket is suppressed. Furthermore, since the connecting part is made of a resin material, it is easy to be tightened and connected to the band so as not to be loose, and the grip lever can be attached to the bar handle in a state in which it is difficult for the grip lever to be supported and operated. .

  As a result, the grip lever can be attached to the bar handle in a state in which the grip lever is unlikely to be rattled and is easy to operate. In addition, the grip lever can be attached to the bar handle in a good-looking state with a compact and simple attachment structure that requires only one tightening bolt and a tightening operation.

In the second aspect of the invention, the lever support portion that supports the grip lever is provided at a position near the rear rotation prevention portion of the front and rear rotation prevention portions in the lateral side portion of the bracket body .

In the third aspect of the invention, a rotation-preventing screw is provided at one end of the band main body to lock the band with respect to the bar handle by locking with the outer peripheral surface of the bar handle .

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall side view of a walking tractor according to an embodiment of the present invention. FIG. 2 is an overall side view of the walking tractor according to the embodiment of the present invention. As shown in these drawings, the walking tractor of the present embodiment is a self-propelled vehicle body that is self-propelled by a pair of left and right driveable tire wheels 1 and 1, and a rear end side of a body frame 2 of the self-propelled vehicle body. A bar-type steering handle 10 connected to the upper portion via a handle support frame 3 and a hitch 4 provided at the rear end of the vehicle body frame 2 are provided.
The walking tractor is configured to connect a rotary tiller (not shown) to the rear part of the self-propelled vehicle body via the hitch 4 and transmit the driving force of the engine 6 from the transmission case 5 to the rotary tiller. Then, various working devices are connected to the rear part of the self-propelled vehicle body, such as configuring a walking type tiller, and various walking type working machines are configured.

The self-propelled vehicle body will be further described in detail.
The vehicle body frame 2 includes the transmission case 5 having a pair of left and right axles 7 and 7 that can be driven at the lower portion, and an engine mounting frame 8 that extends forward from the front portion of the transmission case 5 toward the vehicle body. It is configured. The engine mounting frame 8 supports the engine 6. The mission case 5 inputs the driving force from the output shaft 6a of the engine 6 to the input shaft 5a via the main clutch 9 comprising a belt tension clutch, and the driving mission of the input shaft 5a is located in the mission case. (Not shown) is transmitted to the pair of left and right axles 7,7.

  As shown in FIGS. 1 and 2, the steering handle 10 includes a pair of left and right vehicle body front and rear bar handles 11 and 11, and a vehicle body sideways connection bar 12 that connects the front end portions of the left and right pair of bar handles 11 and 11. And. The pair of left and right bar handles 11 and 11 and the connecting bar 12 are configured by a single round steel pipe bent into a substantially U-shape that is open toward the rear of the vehicle as viewed in the vertical direction of the vehicle. The steering handle 10 is connected to the rear end of the handle support frame 3 at an intermediate portion of the connecting bar 12. The steering handle 10 includes a handle cover 13 that covers the connection bar 12.

  A front end portion of the handle support frame 3 is supported by the transmission case 5 so as to be rotatable and adjustable around an axis P1 that is vertically directed to the vehicle body. The steering handle 10 shown by a solid line in FIG. 1 shows a rearward state. A steering handle 10 indicated by a two-dot chain line in FIG. 1 indicates a forward-facing state. As shown in these drawings, the steering handle 10 is pivotally adjusted together with the handle support frame 3 around the axis P1, so that the steering handle 10 extends rearwardly from the mission case 2 and the mission case. It can be used by switching from 2 to a forward mounting state extending forward from the vehicle body.

  Inside the transmission case 2, a pair of steering clutches (not shown) for steering the self-propelled vehicle body by separately operating transmissions to the left and right wheels 1, 1 are provided. A grip of the one bar handle 11 includes an operating device 20 for operating a steering clutch acting on the left wheel 1 and an operating device 20 for operating a steering clutch (not shown) acting on the right wheel 1. It is distributed and mounted in the vicinity of the portion 11a and the vicinity of the grip portion 11a of the other bar handle 11. The operating device 20 for the steering clutch of the left wheel 1 is supported by the bar handle 11 located on the left side in the rearward mounting state of the steering handle 10, and the operating device 20 for the steering clutch of the right wheel 1 is The steering handle 10 is supported by the bar handle 11 located on the right side in the rearward mounting state.

  FIG. 3 is a side view of each operating device 20. FIG. 4 is a front view of each operating device 20. FIG. 5 is a perspective view of each operating device 20 in an exploded state. As shown in these drawings, each operating device 20 includes a band 21 wound around the grip portion 11 a of the bar handle 11, a bracket 30 supported by the band 21, and a grip supported by the bracket 30. Lever 40.

  The band 21 includes a pair of bolt mounting portions 23, 23 respectively connected to one end side and the other end side of the band main body 22 along the outer peripheral surface of the bar handle 11, and a bolt hole of the one bolt mounting portion 23. A single fastening bolt 24 mounted across the bolt hole of the other bolt mounting portion 23 is provided, and is tightened and connected to the bar handle 11 by the pulling force of both bolt mounting portions 23, 23 by the tightening bolt 24. . The band 21 includes a rotation-preventing screw 25 that is attached to one end of the band main body 22 so as to be freely rotatable. The anti-rotation screw 25 is locked to the outer peripheral surface of the bar handle 11 at the tip thereof, thereby preventing the band 21 from rotating relative to the bar handle 11. The band main body 21 and the pair of bolts 23 and 23 are produced by integral molding of a resin material. That is, the entire band 21 is made of a resin material.

  The bracket 30 includes a bracket body 32 having a pair of left and right lever support portions 31, a connecting portion 33 that is connected to the upper end side of the bracket body 32, and a left lateral side portion on the upper end side of the bracket body 32. A pair of front and rear anti-rotation portions 34, 34 provided, a pair of front and rear anti-rotation portions 34, 34 provided on the right lateral side on the upper end side of the bracket main body 32, and an outer holder connected to the lower portion of the bracket main body 32 35. The bracket main body 32, the connecting portion 33, the anti-rotation portions 34, and the outer holder 35 are produced by integral molding of a resin material. That is, the entire bracket 30 is made of a resin material.

  The connecting portion 33 includes one mounting hole 36 and is formed so as to enter between the pair of bolt mounting portions 23, 23. The fastening bolt 24 is inserted into the mounting hole 36. That is, the connecting portion 33 is connected to the bolt mounting portion 23 of the band 21 by the fastening bolt 24 that fastens and connects the band 21 to the bar handle 11, thereby connecting the bracket 30 to the band 21.

  The pair of left and right lever support portions 31, 31 support a connection pin 37 attached to a mounting arm 41 provided continuously with a base portion of the grip lever 40 on the lateral outer side of the mounting arm 41. Thereby, the bracket 30 supports the grip lever 40 so as to be swingable around the vehicle body lateral axis of the connecting pin 37.

  The left and right pair of front and rear locking portions 34, 34 are connected to the band 21 by the fastening bolts 24 of the bracket 30, and the pair of front and rear stoppers of the stopper portion 26 formed by the one bolt mounting portion 23 of the band 21. The surfaces 26a and 26a are in a state of action opposite to each other. The pair of front and rear detent portions 34, 34 on the right side are connected to the band 21 by the fastening bolt 24 of the bracket 30 so that the pair of front and rear stoppers of the stopper portion 26 formed by the other bolt mounting portion 23 of the band 21 is provided. The surfaces 26a and 26a are in a state of action opposite to each other. In other words, the pair of front and rear anti-rotation portions 34 and 34 on the left side and the pair of front and rear anti-rotation portions 34 and 34 on the right side corresponded when the bracket 30 tried to rotate relative to the band 21 around the mounting hole 36. It abuts against the stopper surface 26a of the stopper portion 26, thereby preventing the bracket 30 from rotating relative to the band 21.

  The outer holder 35 includes an outer support hole 35a that opens toward the front of the vehicle body, and an operation cable 50 that links the grip lever 40 and an operation portion (not shown) of a steering clutch corresponding to the grip lever 40. The end portion of the outer cable 51 is inserted and supported in the outer support hole 35a from the front.

  The grip lever 40 is produced by molding a resin material. The mounting arm 41 of the grip lever 40 is formed integrally with the grip lever 40 from a resin material. The grip lever 40 includes a cable connection hole 42 provided at the base of the grip lever 40 when the resin material is molded. The cable connection hole 42 is connected to the end 52 a of the inner cable 52 of the operation cable 50. Yes.

  That is, by gripping the grip lever 40 with a hand that supports the grip portion 11a of the handle bar 11, the grip lever 40 is swung upward about the axis of the connecting pin 37, and the inner cable 52 is pulled. The corresponding steering clutch is switched to the disengaged state. In addition, by releasing the grip operation of the grip lever 40, the grip lever 40 is swung downward about the axis of the connecting pin 37 by the return force of the steering clutch, and the inner cable 52 is loosened and operated. Return the steering clutch to the engaged state.

[Another Example]
The present invention can be applied not only to an operating device mounted on a bar handle of a walking type tractor but also to an operating device mounted on a bar handle of various working machines such as a bar handle of a walking type rice transplanter. Accordingly, the walking type tractor, the walking type rice transplanter and the like are collectively referred to as a walking type work machine. Further, the present invention can be applied to an operation device that targets various operation devices such as a brake in addition to the steering clutch as an operation target as in the above embodiment.

Overall side view of walking tractor Overall plan view of walking tractor Side view of operating device Front view of operating device A perspective view of the operating device in an exploded state (B) is a side view of the previously developed operating device, and (b) is a front view of the previously developed operating device.

11 Bar handle 21 Band
22 Band body 23 Bolt mounting part 24 Tightening bolt
25 Detent screw
26a Stopper surface 30 Bracket
31 Lever support
32 Bracket body 33 Connecting portion 34 Non-rotating portion 36 Mounting hole 40 Grip lever

Claims (3)

Includes a band wrapped bar handle of the walk-behind working machine, and a single tightening bolt connecting tightened before Symbol band to the bar handle, and a bracket for supporting the grip lever swingably,
The band includes a band main body along the outer peripheral surface of the bar handle, and left and right bolt mounting portions that are connected downward on both ends of the band main body and formed with left and right bolt holes. , Forming front and rear stopper surfaces on the front and rear sides of the bolt mounting portion,
The bracket includes a bracket main body, a connecting portion made of a resin material that is connected to an upper end side of the bracket main body and enters between the pair of left and right bolt mounting portions of the band, and a left-right direction provided in the connecting portion . Comprising a mounting hole and a front and rear detent portion projecting left and right on the lateral side of the bracket body ;
The tightening bolts mounted on the pair of left and right bolt mounting portions are inserted through the mounting holes to connect the connecting portions to the band, and the front and rear anti-rotation portions are opposed to the front and rear stopper surfaces, respectively. construction work machine handlebar manipulation device are to become the activated condition performs detent for said bands at said mounting hole about said bracket. The work implement bar handle according to claim 1 , wherein a lever support portion for supporting the grip lever is provided at a position near a rear-side detent portion of the front and rear detent portions in the lateral side portion of the bracket body. Operating device. The work machine bar handle operation according to claim 1 or 2, further comprising a detent screw at one end of the band main body for locking the band with respect to the bar handle by engaging with an outer peripheral surface of the bar handle. apparatus.

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