JPH0214334Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an elevating device for a working machine such as a front mower mounted on a running vehicle such as an agricultural tractor.

<Prior Art> As a conventional technology regarding this type of work machine lifting device, for example, the one disclosed in Japanese Patent Application Laid-Open No. 126713/1983 is known.

That is, in this conventional technology, at the front of the tractor,
The front mower was mounted so that it could be raised and lowered via a three-point linkage mechanism.

<Problems to be solved by the invention> In a conventional lifting device using a three-point linkage mechanism, the mower is connected by a parallel link-like connecting part consisting of a lower link, a top link, and a top mast, so the ability of the mower to follow the ground is poor. There was a problem that it was bad.

Furthermore, when the mower is raised, the front part of the mower rises forward and the cutter is exposed, which is extremely dangerous when driving on the road.

<Means for solving the problems> Therefore, the present invention was devised in view of the above problems. To provide a working machine elevating device which allows the working machine to be almost horizontal with respect to the ground, and can be lifted up in a forward upward direction when going over a ridge or the like. Therefore, the feature is that the work implement is pivotably connected in the vertical direction to a connecting rod that is pivotally connected in the vertical direction to the traveling vehicle, and the connecting rod pivot position of the working device is Lifting means that are operated vertically from the traveling vehicle side are locked at different positions, and when the work equipment is raised by the lifting means and the work equipment rotates a predetermined amount at the connecting rod pivot portion, the work equipment and the connecting rod are The point is that an engaging portion is provided that engages and becomes integral.

<Function> The work equipment is pivotably mounted in the vertical direction to a connecting rod that is pivotably mounted in the vertical direction on the traveling vehicle,
It touches the ground under its own weight and is towed by a moving vehicle while following the unevenness of the ground. If the lifting means is configured with a chain or other device that transmits force in response to tensile force but not in response to compressive force, the followability of the work equipment can be improved by keeping the lifting means slack. Can be secured.

When lifting the work equipment, pull the lifting means upward. This upward movement of the lifting means also causes the work equipment to move upward, but instead of the entire work equipment moving upward parallel to the ground, one end touches the ground and the side on which the lifting means is locked slopes. Go up. That is, the connecting rod pivot portion of the working machine rotates relative to each other. When this relative rotation exceeds a predetermined angle, the connecting rod and the working machine engage with each other at the engaging portion, and henceforth, the relative rotation of the working machine and the connecting rod is prevented. When the lifting means is still moved upwardly, the connecting rod pivots at the pivot point of the traveling vehicle, and the work implement pivots upward about the pivot point.

The upward movement of the lifting means is then stopped at a position where the work machine is parallel to the ground or in a forward upward position, and this state is maintained, thereby completing the lifting operation of the work machine.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 and 2, a front mower 3 shown as an example of a working machine is attached to the front part of a tractor 1 shown as an example of a traveling vehicle via a working machine lifting device 2 according to the present invention. It is what was done.

The tractor 1 has front wheels 4 and rear wheels 5, and a vehicle body 6.
A steering handle 7 stands upright at the front of the vehicle, and a driver's seat 8 is arranged behind it. engine 9
is provided at the rear of the vehicle body 6, and a clutch housing 10 and a transmission case 1 are provided in front of the engine 9.
1st class is placed. A front PTO shaft 12 protrudes forward from the front part of the transmission case 11.
From the middle part of the transmission case 11 to the rear wheel differential 13
A transmission shaft 14 that transmits power to is extended.

A mower 3 attached to the front part of the tractor 1
has a power receiving shaft 16 at the center of the upper surface of a mower deck 15, and has three sets of rotary cutters 17 below the deck 15.

The front edge of the mower deck 15 has a pair of left and right front gauge wheels 18 and a grounding wheel 19 in the center, and the rear edge has a pair of left and right grounding wheels 20 and a rear gauge wheel 21 in the center. and has.

The mower 3 has a power receiving shaft 16 and a front PTO
The shaft 12 is interlocked with the shaft 12 by a universal joint shaft 22, and is also connected to the tractor 1 via the lifting device 2.

The work equipment lifting device 2 includes a pair of left and right connecting rods 2.
3, a lift arm 24, a lifting means 25, etc.

The connecting rod 23 has its rear end pivotally attached to the front part of the tractor body 6 so as to be freely rotatable in the vertical direction, and its front end is pivotally attached to the bracket 26 provided at the front part of the upper surface of the mower deck 15 so as to be freely rotatable in the vertical direction. I'm wearing it.

An engaging portion 27 is provided in a protruding manner on the rear upper surface of the mower deck 15 below the connecting rod 23.

The lift arms 24 are provided on a pair of left and right cylinders 28 rotatably provided at the front of the vehicle body 6 so as to project forward, and the cylinders 28 are rotated by a pair of left and right lift cylinders 29 .

A lifting means 25 is connected to the front end of the lift arm 24, and the lower end of the lifting means 25 is locked to the rear upper surface of the mower deck 15.

This lifting means 25 is made of something that transmits tensile force but not compressive force, such as a chain or wire. Furthermore, when a non-compressible rod-shaped body or the like is used, the lift arm 24 and the rod-shaped body may be connected through an elongated hole or the like.

To explain the operation of the above embodiment of the present invention,
Lawn mowing work using the mower 3 is performed in the state shown in FIG.

That is, the mower 3 is pushed forward via the connecting rod 23, and the lifting means 25 is slackened, so the mower 3 moves forward while following the unevenness of the ground by the gauge wheels 18, 21 or the ground wheels 19, 20. do.

Next, when lifting the mower 3, as shown in FIG. 3, the cylinder 29 is extended and the lift arm 24 is rotated upward. By the upward rotation of the lift arm 24, the mower 3 is moved via the lifting means 25.
Its rear part is lifted.

Thus, the mower 3 rotates by a predetermined angle at the pivot point of the connecting rod 23, and the lower surface of the connecting rod 23 and the upper surface of the engaging portion 27 come into contact. In this state of contact, the connecting rod 23 and the mower 3 are made parallel to each other.
The amount of protrusion of the engaging portion 27 is determined.

When the lift arm 24 is further rotated upward, the mower 3 and the connecting rod 23 become one body, and the connecting rod 23
Rotates upwards around the rear end pivot point. When the lift arm 24 is further rotated, the mower 3 assumes a position parallel to the ground, and when the lift arm 24 is further rotated, the mower 3 assumes a forward upward position as shown in FIG.

Note that the present invention is not limited to the above embodiment, and the working machine may be mounted on the rear or side of the vehicle. Further, the pivot position of the mower deck and the connecting rod and the locking position of the lifting means may be arbitrary, and the engaging portion may be hook-shaped and engage with the upper surface of the connecting rod.

<Effects of the invention> According to the invention, the ground tracking ability of the work equipment is improved, and in the lifting process of the work equipment, it is possible to take forward down, parallel, and front up positions with respect to the ground, which improves safety. This is preferable.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIGS. 3 and 4 are front views of main parts for explaining the operation. 1...Tractor (vehicle), 3...Mower (work machine),
23... Connecting rod, 25... Lifting means, 27... Engaging portion.

Claims (1)

[Scope of utility model registration request] A work implement is pivotally connected in a vertically rotatable manner to a connecting rod that is pivotally connected to a traveling vehicle in a vertically rotatable manner. When the lifting means to be operated is locked and the lifting means lifts the work equipment and the work equipment rotates by a predetermined amount at the connecting rod pivot portion, the work equipment and the connecting rod engage and become an integral body. A work machine lifting device characterized by being provided with a joint.