JPS6040690Y2 - Earthwork plate operation lever device for tilt dozer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an earthwork plate operating lever device for a tilt dozer that allows the earthwork plate to be moved up and down and tilted using hydraulic pressure.

This type of conventional lever device is equipped with a safety lever, and when the safety lever is set to the lock position, the operating lever is locked, and when the safety lever is set to the free position, the operating lever becomes operable.
When this is rotated in the front-back direction, the earthwork plate moves up and down, and when it is rotated in the left-right direction, the earthwork plate is tilted.

However, as mentioned above, the control lever in the free state can be rotated in many directions, front to back, left and right, so even if you intend to turn the control lever in the front and back direction to move the earthwork board up and down, it will cause vibrations in the vehicle body. There was a problem in that, due to inexperience with operation, the control lever could be swung left and right, causing the earthwork board to tilt unnecessarily.

The present invention was developed in consideration of the above-mentioned issues, and by adding a tilt lock mechanism to the conventional safety lever mechanism, it is possible to prevent unintentional tilting movements when the earthwork board is moved up and down, making each operation easier. It is an object of the present invention to provide an earthwork plate operation lever device for a tilt dozer which allows the operation to be performed accurately.

The configuration will be explained below based on the embodiment shown in the drawings.

In the figure, reference numeral 1 designates an operating lever for an earthwork board. This operating lever 1 is rotatable in the front and back direction with a fulcrum 2, and is attached to an arm 3 fixed to a pivot boss portion 1a via a link mechanism 4. A vertical movement switching valve 5 for vertically operating the earthwork board is connected.

Further, the support boss 1a that supports the rotational boss portion 1a of the operating lever 1 is fixed to a rotational shaft 6 having an axis perpendicular to the rotational axis of the rotational boss portion 1a. The shaft 6 is connected via a link mechanism 7 to a tilt switching valve 8 for tilting the earthwork board.

A locking plate 9 is fixed to the rotary boss portion 1a of the operating lever 1.

A recess 10 is formed at the tip of this locking plate 9.

Reference numeral 11 denotes a safety lever provided above the rotary boss portion 1a of the operating lever 1 so as to be freely rotatable in the front and rear direction.
The notch 12 having t 12bt 12c is fixed.

Balls 13 are spring-biased and engaged with each groove of the notch 12, and the balls 13 and the notch 12 move the safety lever 11 to the lock position A1 and the tilt lock position B.
1. It is designed to be positioned at free position C.

The rotation boss lla of the safety lever 11 has a horizontal shaft 1.
A yoke 15 having a diameter of 4 is provided.

The positional relationship between the yoke 15 and the locking plate 9 is such that when the safety lever 11 is in the free position C, they do not interfere, the safety lever 11 is in the tilt lock position B, and the operating lever 1 is moved in the front-rear direction. When the locking plate 9 is in the rotational operation state, the locking plate 9 is engaged with the yoke 15 in the left-right direction, and when the safety lever 11 is in the lock position A and the operating lever 1 is in the 1st position, the locking plate 9 is engaged with the yoke 15 in the left-right direction. 9 engages with the yoke 15 in the left-right direction, and the recess 10 of the locking plate 9
is in a positional relationship such that it engages with the horizontal shaft 14 in the front-rear direction.

Note that one of the two plates constituting the yoke 15 is removably fixed with bolts.

In the above configuration, when the safety lever 11 is set to the free position C, the operating lever 1 can be rotated in the front-rear and lateral directions. 'Earthwork plates are controlled at each position on the float.

Also, by rotating in the horizontal direction, the left tilt J%'
The earthwork board is controlled at each position: hold yo, right tilt yo.

When the safety lever 11 is set to tilt lock position B,
The locking plate 9 engages with the yoke 15, and the operating lever 1 can be rotated only in the front-back direction, but cannot be tilted, and no tilting movement is applied when the earthwork board is moved up and down.

When the safety lever 11 is set to the lock position A, the horizontal shaft 14 engages with the recess 10 of the locking plate 9 when the operating lever 1 is in the 1-way position, and the operating lever 1 is locked in that position front and rear, left and right. be done.

The present invention is as described above, and is configured to be able to freely rotate in the front-rear direction and left-right direction.When the earthwork board is rotated in the front-rear direction, it moves up and down, and when it is rotated in the left-right direction, it tilts. Operation lever 1 connected to the switching valve via a link mechanism
A locking plate 9 having a concave portion 10 at the tip of the rotating boss portion 1a.
A safety lever 11 is provided above the rotary boss 1a of the operation lever 1, and is rotatable in the front and back direction and can be positioned at a lock position A1, a tilt lock position B1, and a free position C. The safety lever 11 is provided with a yoke 15 having a horizontal shaft 14, and this yoke 15
The positional relationship between the safety lever 11 and the locking plate 9 is
When the safety lever 11 is at the free position C, there is no interference between the two, and when the safety lever 11 is at the tilt lock position B and the operating lever 1 is in the forward and backward rotational state, the locking plate 9 does not touch the yoke 15 left or right. When the safety lever 11 is in the lock position A and the operating lever 1 is in the 1st position, the locking plate 9 engages the yoke 15 in the left-right direction, and the locking plate 9 engages with the yoke 15 in the horizontal direction. Since the concave portion 10 is configured in a positional relationship in which it engages with the horizontal shaft 14 in the front-rear direction, unintended tilt operation can be prevented by setting the safety lever 11 to the tilt lock position B when the operation lever 1 is operated up and down. This allows each operation to be performed easily and accurately.

Further, tilt locking and locking operations can be performed with one safety lever 11, and the desired purpose can be achieved with a small number of levers.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view;
Fig. 2 is a front view, Fig. 3 is a plan view of a part of the safety lever, Fig. 4 is a view taken along the line ■ in Fig. 1, and Fig. 5 is a - - in Fig. 3.
FIG. 6 is an enlarged sectional view taken along the line Vl-VI in FIG. 1. 1 is an operating lever, 1a is a rotating boss, 9 is a locking plate, 10 is a recess, 11 is a safety lever, 14 is a horizontal shaft, and 15 is a yoke.

Claims (1)

[Scope of utility model registration request] It is configured to be able to freely rotate in the front-rear and left-right directions, and is connected to the switching valve via a link mechanism so that when it rotates in the front-rear direction, the earthwork plate moves up and down, and when it rotates in the left-right direction, it tilts. A locking plate 9 having a concave portion 10 at the tip is fixed to the rotating boss portion 1a of the operating lever 1, and the operating lever 1 is
A safety lever 11 is provided above the rotary boss portion 1a, which is rotatable in the front-rear direction and can be positioned at a lock position A1, a tilt lock position B1, and a free position C;
This safety lever 11 is provided with a yoke 15 having a horizontal shaft 14, and the positional relationship between this yoke 15 and the locking plate 9 is such that when the safety lever 11 is in the free position C, there is no interference between the two, and the safety lever 11 is in the tilt lock position B, and when the operating lever 1 is in the state of being rotated in the front-back direction, the locking plate 9 engages with the yoke 15 in the left-right direction, and the safety lever 11 is in the force-sensing position A. , and when the operating lever 1 is in the 1-position position, the locking plate 9 engages the yoke 15 in the left-right direction, and the recess 10 of the locking plate 9 engages the horizontal shaft 14 in the front-back direction. An earthwork plate operating lever device for a tilt dozer, characterized in that it has a positional relationship that allows it to operate.