JP2502718Y2 - Tilt device for work vehicle handle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tilting device for a steering handle for a work vehicle.

Prior Art FIG. 3 and FIG. 4 are diagrams showing the prior art.
The figure is a side view of the wheel-type shovel 1 of the work vehicle. In the figure, 2 is a lower traveling structure, 3 is an upper revolving structure,
4 is a driver's cab, 5 is a steering wheel in the driver's cab 4, and 6 is a driver's seat. FIG. 4 is a side view around the handle 5. In the figure, 7 is a tilting device for the handle 5, 8 is a bracket member standing on the floor plate 9, 10 is a support bracket fixed to the floor plate 9, 11 is a column member of the handle 5, and 12 is a pivot for supporting the lower end of the column member 11. Reference numeral 13 denotes a plate portion protruding and fixed to the front of the column member 11, 14 denotes a plurality of pin holes formed in the bracket member 8, and 15 (in the figure, present near the tip of the plate portion 13 on the back side of the bracket member 8). Is a pin hole formed in the plate portion 13, and 16 is a pin hole in the pin hole 13.
It is a locking pin to be engaged with any of 14.

Next, the configuration and function of the conventional tilting device 7 will be described below.
Referring to FIG. A fulcrum portion 12 at the lower end of the column member 11 of the handle 5 is pivotally supported by a support bracket 10 fixed on the floor plate 9, so that the handle 5 is mounted so as to be rotatable in the front-rear direction. The pin hole 15 of the plate portion 13 fixed to the column member 11 has a distance R from the fulcrum portion 12.
Is drilled at the position. On the other hand, the plurality of pin holes 14 provided on the bracket member 8 erected on the floor plate 9 are respectively formed on the circular arc of radius R centered on the fulcrum portion 12 and at an angle θ as shown in FIG. The holes are staggered. Therefore, tilt the handle 5 in the direction of arrow (a),
When the locking pin 16 is inserted after the pin hole 15 is aligned with any one of the plurality of pin holes 14, the handle 5 can be set to a desired tilt angle.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-described tilting device of the related art, when the handle is set to a desired tilt angle, the pin hole of the plate portion protruding and fixed to the front of the column member is erected on the floor plate. It was necessary to engage one of the desired positions of the plurality of pin holes formed in the bracket member with the locking pin.

In the tilting device having such a structure,
The driver tends to be in an unreasonable posture, and its operation is troublesome, and sometimes it takes a long time, and the bracket member and the plate portion are arranged so as to project to the front of the column member in the space above the floor plate. Therefore, when working by operating the work device operating lever (not shown) of the work vehicle, particularly when working while checking the condition on the ground, when excavating below the ground, etc.
This is not preferable because it hinders the driver's visual field at the front lower side of the cab. If the plate member and the bracket member described above are arranged on the driver's seat side of the column member in order to insert the locking pin and improve the field of view on the lower front side, the purpose can be achieved at first sight. However, during the work operation of the work vehicle, it is necessary to stop the operation temporarily, and to get on and off the cab frequently because of construction meetings, confirmation of the site, etc. Consideration should be given to widening the space between the steering handle and the column, and the space for arranging the working device operating lever should be taken into consideration.
The floorboard area should be as large as possible and there should be no obstructions. Furthermore, during construction while repeating small movements of the work vehicle body, both the steering handle and the working device operating lever must be within a range that the driver's hand can easily reach. Each time the driver gets on and off the vehicle, he or she must tilt the steering wheel.

In response to such demands, the present invention makes it possible to easily change the setting of the steering handle position in a short time, and without obstructing the field of view in the lower front of the cab while operating the working device, and It is an object of the present invention to provide a tilting device for a handle for a work vehicle having a structure in which a driver's foot on a floor plate in front, and further, both sides of a column are wide, and there is no protrusion that becomes an obstacle.

Means for Solving the Problems In order to solve the above problems, the present invention has taken the following means. That is, a. A support bracket fixed to the front of the driver's seat on the floor plate of the operator's cab allows the column member to rotate in the front-rear direction by a pin that inserts the bracket and the lower fulcrum of the column member having the steering handle. A handle device for a work vehicle having a structure of pivotally supporting, b. The lower end of the column member is extended so as to project through the through hole of the floor plate in the direction opposite to the steering handle, and the bracket is projected on the back surface of the floor plate at a predetermined distance from the pin hole of the support bracket. Set up.

C. Between the lower end of the extended column member and the bracket projecting on the bottom surface of the floorboard, the effective length of the actuator remains unchanged when no external force is applied to the actuator, and the external force is applied to the actuator. Both ends of the mechanical lock mechanism, which is in the unlocked state where the effective length is free when acted on, are connected by pins, and d. In the middle of the column member of the steering handle, a knob with a lever portion having a lever that swings as the knob rotates is rotatably supported. The lever tip of the knob with the lever portion and the actuator of the mechanical lock mechanism are connected by a push-pull cable.

Action a. When the knob with a lever attached to the column member of the steering handle is not rotated, the push-pull cable connected to the lever of the knob with a lever acts on the actuator of the mechanical lock mechanism. Does not reach. Therefore, the mechanical lock mechanism is in the locked state, and the lower end of the column member is fixed to the floor plate by the mechanical lock mechanism in the locked state and the bracket fixed to the bottom surface of the floor plate, and the tilting angle of the steering handle is Hold that state.

B. When the knob with the lever portion is manually rotated to apply an external force to the actuator of the mechanical lock mechanism via the push-pull cable, the locked state of the mechanical lock mechanism is released. In this state, the driver can tilt the hunter at an arbitrary angle. When the driver releases the knob with the lever while keeping the handle tilted to the required tilt angle, the external force acting on the actuator of the mechanical lock mechanism via the push-pull cable disappears, and the mechanical lock mechanism locks. Then, the handle is fixed at a desired tilting angle. When a resistance force acts on the actuator connection mechanism, the push-pull cable may be used to forcibly apply the action force in the locking direction.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a tilting device 18 for a handle 17 according to the present invention. In the figure, 19 is a floor plate, 20 is a support bracket, 21 is a column member of the handle 17, 22 is a fulcrum portion of the column member 21, 23 is beyond the fulcrum portion 2, and extends as if loosely penetrating a through hole provided in the floor plate 19. Lower end of the column member 21, 24 is a bracket protruding downward on the lower surface of the floor plate 19, 25 is a mechanical lock mechanism having a function described later, 26
Is a knob with a lever portion, 27 is a lever portion integrally formed with the knob with a lever portion 26, and 28 is a push-pull cable. FIG. 2 is a front view of an essential part viewed from A in FIG.
Next, the configuration of the tilt device 18 according to the present invention will be described in detail with reference to FIGS. 1 and 2. Floorboard of driver's cab (not shown)
A lower point portion 22 of the column member 21 is pivotally supported on a support bracket 20 provided on 19 so as to be rotatable in the front-rear direction with respect to the driver's seat 6 (see FIGS. 3 and 4). The lower end 23,
A mechanical lock mechanism 25 is provided between the floor plate 19 and a bracket 24 protruding from the floor plate 19. On the other hand, a knob 26 with a lever portion is rotatably attached below and in the middle of the steering handle 17 on the column member 21, and the lever portion 27 and the actuator of the mechanical lock mechanism 25 are connected by a push-pull cable 28. Connected via. Then, when the knob 26 with the lever portion is not rotated, that is, when no external force acts on the actuator, the mechanical lock mechanism 25 is in a self-locking state by itself, and the knob 26 with the lever portion is operated. The mechanical lock mechanism 25 has a function of being unlocked when it is rotated and an acting force is applied to the actuator through the push-pull cable 28 against its own force.

Next, the function and function of the tilt device 18 according to the present invention will be described. Knob with lever attached to column member 21
When the 26 is not rotated, the push-pull cable 28 connected to the lever portion 27 does not exert an acting force on the actuator of the mechanical lock mechanism 25, so the mechanical lock mechanism 25 is in the self-locking state. And
The lower end portion 23 of the column member 21 has a mechanical lock mechanism 25,
It is fixed to the floor plate 19 via a bracket 24. Next, manually rotate the knob 26 with lever to
27, through the push-pull cable 28, when acting force that opposes the self-power of the actuator of the mechanical lock mechanism 25,
The locked state of the mechanical lock mechanism 25 is released.
In this state, the driver can tilt the steering wheel 17 to any position or angle. Then, the driver tilts the handlebar 17 to a desired tilting angle and the knob with the lever is attached.
When 26 is released and the external force acting on the push-pull cable 28 disappears, the mechanical lock mechanism 25 returns to the original self-locking state, so that the handle 17 is fixed at the tilt angle at that time.

Effect of the Invention In the tilting device for the handle of the working vehicle of the present invention, the lower fulcrum of the column member for holding the steering handle is pivotally supported in the front-back direction on a support bracket provided on the floor plate of the cab, Both ends of the mechanical lock mechanism are connected between the lower end of the column member extending downward from the pivot point and the bracket projecting downward on the back surface of the floorboard. As a result, the mechanical lock mechanism is placed on the lower surface side of the floor plate, the driver's feet are smooth, and when setting the position or angle of the steering wheel, the pivot point on the support bracket is the center. Since only the column member pivots back and forth above the floor plate in front of the driver's seat, regardless of the set angle,
The feet in front of the driver's seat and the left and right sides of the column are wide, and there are no obstacles.Therefore, frequent boarding / alighting during work operations does not hinder anything, and auxiliary operations are performed on the floor plate on the side of the column. It is also easy to add pedals for use.

Further, a knob with a lever portion is provided in the middle of the column member, and when the knob is operated by a driver, a force is exerted on the operator of the mechanical lock mechanism via a push-pull cable to bring the lock mechanism into a self-locking state. Or to unlock. Therefore, the driver can step the steering handle arbitrarily by tilting or setting and holding the steering handle only by operating the knob with the lever. Therefore, the tilting operation does not result in an unnatural posture. In addition to being easy to operate, the push-pull cable can transmit the operating force in both directions, so the self-locking and unlocking functions of the mechanical lock mechanism are always stable for a long period of time even under adverse conditions. It can be anything.

In addition, the mechanical lock mechanism that constitutes the tilting device of the present invention is mounted on the lower surface side of the floor plate, and the knob with lever is mounted on the column member of the steering handle in a compact shape. Compared with the tilt device of the prior art adopted as, there is no component member that obstructs the driver's view of the front lower side of the driver's seat, which is particularly convenient when working near or below the ground. In addition, since the handle device is composed of simple components and the basic structure of the handle device is the same as that of the prior art, only some of the members need to be modified, so that its manufacture and modification to the present invention are easy. It is inexpensive and helps improve the aesthetics around the steering wheel.

[Brief description of drawings]

FIG. 1 is a side view of a tilting device for a handle according to the present invention, FIG. 2 is a front view of an essential part seen from A of FIG. 1, FIG. 3 is a side view of a wheel type shovel, and FIG. It is a side view of a technical handle periphery. 5,17 …… Handle 7,18 …… Tilt device 9,19 …… Floor plate 10,20 …… Support bracket 11,21 …… Column member 12,22 …… Support point 23 …… Lower end 25 …… Mechanical lock Mechanism 26 …… Knob with lever 28 …… Push-pull cable

Claims (1)

(57) [Scope of utility model registration request] 1. A steering bracket for a working vehicle comprising a steering handle and a column member for holding the steering handle, the lower part of the column member being fixed to a floor plate of a driver's cab, the steering device being tiltable in the front-back direction. In the tilt-type steering device pivotally supported on the column member, the column member is directed downwardly on the side opposite to the steering handle holding side, penetrates through a hole in the floor plate provided so as not to interfere when the column is tilted in the front-rear direction, and is provided at the tip end. A bracket having an extension column portion having an engagement shaft hole, protruding from the engagement shaft hole of the extension column portion and the lower surface of the floor plate, and having the engagement shaft hole at a predetermined distance from the tilt axis of the column portion. When the external force does not act on the actuator between the locking shaft hole on the bracket and the locking shaft hole at the end of the extension column, its effective length is set. A mechanical lock mechanism that is held but has an effective length that is free when an external force is applied to the actuator is connected, and the actuator of the mechanical lock mechanism is fixed on a column member below the steering handle via a push-pull cable. A tilting device for a handle for a work vehicle, wherein the tilting device is operated by operating a knob with a lever portion.