JP2526109Y2 - Mast tilt angle display device for forklift - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilt angle display device for a mast of a forklift, and more particularly to a pendulum tilt angle display device.

[0002]

2. Description of the Related Art In the operation of a forklift, it is necessary for a driver to accurately grasp the inclination angle of a mast. For this reason, devices that measure and display the mast inclination angle and notify the driver of the mast have been developed, and as one of them, a pendulum type mast inclination angle display device is known.

FIG. 5 shows an outline of a conventionally known pendulum type mast inclination angle display device with a weight. 5A is a cross-sectional view, and FIG.
Is a side view.

[0004] The basic structure thereof will be described. A base end of a link 4 is swingably attached via a pin 3 to the center of a base plate 2 fixed to the side surface of the mast 1 by welding or bolts. A weight 5 is attached to the tip of the link 4 to form a pendulum 6. A base end of the pointer 7 is fixed to the swing center of the link 4, and a distal end 7 ′ of the pointer 7 is bent in an L-shape. The distal bent portion 7 ′ moves along the cover 8 fixed to the outer periphery of the base plate 2.

Here, when the base plate 2 is tilted with the forward and backward tilt of the mast 1, the weight 5 always faces in the vertical direction.
The pendulum 6 swings relatively to the mast 1 about the pin 3, and at the same time, the pointer 7 moves with respect to the cover 8. At this time, the inclination angle of the mast 1 can be known from the scale 9 on the cover 8 and the bent end portion 7 'of the pointer 7.

According to the above structure, the swing amount of the pointer 7 and the inclination angle of the mast 1 become equal. Therefore, in general, if the mast inclination angle is a total of 18 °, ie, a forward inclination of 6 ° and a backward inclination of 12 °, the pointer 7
Is calculated by the circumference, and the outer diameter of the cover 8 is set to 100
mm, δ = 100π × 18 ° / 360 ° = 1
5.7 mm, the value of δ = 15.7 mm is 15.7 mm / 18 ° ≒ 0.9 mm per 1 degree of mast tilt angle, and there is a problem that it is very difficult to visually recognize it. The effect was not so much expected.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problem. In a pendulum type mast tilt angle display device, a tilt angle of a mast detected by a pendulum is directly used. It is an object of the present invention to provide a forklift mast tilt angle display device which is enlarged and displayed without being displayed so that it can be easily recognized.

[0008]

SUMMARY OF THE INVENTION The present invention provides a means for solving the above-mentioned problems, and includes a base plate 2 having an arc-shaped peripheral portion 13 fixed to a side surface of a mast 1.
In addition, the upper end of the long link 10 and one end of the short link 12 are pivotably mounted on the shaft, and the lower end of the long link 10 and the tip of the short link 12 are connected by the connecting link 11. Attached weight 15 and short link 12
A base end portion of the pointer 7 is attached to the center of swing of the forklift, and a bent end portion 7 'of the pointer 7 is movable along the cover 8 on the arc-shaped peripheral portion 13. The present invention is directed to a tilt angle display device.

[0009]

1 to 4 show an embodiment of the present invention. 1 shows the structure, a is a vertical side view, b is a vertical front view, c
Is a side view. FIG. 2 is an explanatory view of the operating state, in which a
Indicates a backward tilt state of the mast, and b indicates a forward tilt state. FIG.
FIG. 4 is an explanatory view for comparing the swing angles of the long and short links, and FIG. 4 is an overall side view of the forklift showing a mounting position of the device of the present invention.

A base plate 2 having an arc-shaped peripheral portion 13 fixed to a side surface of a mast 1 by welding or bolts or the like.
The upper end of the long link 10 is swingably attached via a pin 14. The lower end of the long link 10 has a weight 15
Are attached to form a pendulum 16. The above is almost the same as the conventional example shown in FIG. 5, but the mounting position of the upper end of the long link 10 with respect to the base plate 2, that is, the swing center, is located above the base plate 2, not at the center.

On the other hand, one end of the short link 12 is swingably attached via a pin 19 to the center of curvature of the arc-shaped peripheral portion 13 of the base plate 2.
The other end of 2 is connected to the lower end of the long link 10 via a connecting link 11. Reference numeral 17 denotes a connection pin between the long link 10 and the connection link 11, and reference numeral 18 denotes a connection pin between the short link 12 and the connection link 11.

FIG. 2 shows an operation state accompanying the inclination of the mast 1. One end of the long link 10 is connected to the short link 1 by a pin 14.
One end of base plate 2 is connected to base plate 2 by pin 19.
, And the other end is connected to each other by a connecting link 11. However, since the connecting link 11 and the connecting pins 17 and 18 are not restrained by the base plate 2, the long link 10 and the short link 12 are connected to each other. Can swing in conjunction.

A base end of the pointer 7 having an L-shaped bent portion 7 'at the tip is fixed to the swing center of the short link 12, and the bent portion of the pointer 7 is moved with the movement of the short link 12. 7 ′ is movable along the arc-shaped peripheral edge cover 8 of the base plate 2.

[0014]

According to the present invention, the weight of the weight 15 is reduced when the base plate 2 is tilted in accordance with the forward and backward tilt of the mast 1.
Pendulum 16 acts on the pin 14
, And the long link 10 maintains the vertical state.

At this time, the pendulum 16 is moved by its inertia force.
The connecting pin 17, the connecting link 11, and the connecting pin 18 are moved to finally swing the short link 12. As a result, since the pointer 7 also swings with respect to the base plate 2, the inclination angle of the mast 1 can be known from the scale 9 on the cover 8 and the bent end portion 7 'of the pointer 7.

As shown in FIG. 3, when the long link 10 swings by α degrees and the weight 15 moves from the point B to the point B ′, the length of the connecting link 11 is constant. The point moves by an amount corresponding to the amount of movement between the points B and B 'and reaches the point C'.

By the way, the movement amount of B → B ′ is
Is a chord of an arc having a radius equal to the length of the long link 10, while the movement amount of C → C ′ is a chord of an arc having a radius equal to the length of the short link 12 centering on the pin 19. From
Assuming that the two movement amounts are substantially equal, the swing angle β ° of the short link 12 that draws a circle with a small diameter is larger than the swing angle α ° of the long link 10.

That is, the swing angle β of the short link 12 (= the swing angle of the pointer 7) can be enlarged with respect to the swing angle α of the long link 10 (= the inclination angle of the mast). The ratio is determined by the ratio of the lengths of the long link 10 and the short link 12. The length ratio can be arbitrarily selected, but it is preferable that the length of the short link 12 be equal to or less than の of the length of the long link 10.

[0019]

According to the present invention, a long link 1 is attached to a base plate 2 having an arc-shaped peripheral portion fixed to the side surface of a mast 1.
0 and one end of the short link 12 are pivotally connected to each other, and the lower end of the long link 10 and the tip of the short link 12 are connected by the connection link 11. Attachment, the base end of the pointer 7 is attached to the swing center of the short link 12, and the distal bent portion 7 'of the pointer 7 is movable along the cover 8 of the arc-shaped peripheral portion. In the mast inclination angle display device, the inclination angle of the mast detected by the pendulum can be enlarged and displayed. As a result, the driver's labor is reduced, and safety and work efficiency are greatly improved.

[Brief description of the drawings]

1 shows a structure of an embodiment of the present invention, wherein a is a vertical side view, b is a vertical front view, and c is a side view.

FIGS. 2A and 2B are explanatory views showing an operation state of the embodiment of the present invention, wherein a denotes a mast rearwardly inclined state, and b denotes a forwardly inclined state.

FIG. 3 is a diagram for explaining a swing angle of both long and short links.

FIG. 4 is an overall side view of the forklift showing a mounting position of the device of the present invention.

5A and 5B show a structure of a conventional example, in which a is a longitudinal front view and b is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mast 2 Base plate 7 Pointer 7 'Tip bent part of pointer 8 Cover 9 Scale 10 Long link 11 Connecting link 12 Short link 13 Arc-shaped peripheral part of base plate 14 Mounting pin for long link 15 Weight 16 Pendulum 17, Pendulum 17, 18 Connection pin 19 Short link mounting pin A Long link swing center B Long link lower end position C Short link tip position D Short link swing center

Claims (4)

(57) [Scope of request for utility model registration] A long link (10) is attached to a base plate (2) having an arc-shaped peripheral portion (13) fixed to a side surface of a mast (1).
Of the short link (12) and the upper end of the
The lower end of the long link (10) and the tip of the short link (12) are connected by a connecting link (11), and a weight (15) is attached to the lower end of the long link (10), and the short link (12) is The base of the pointer (7) is attached to the center of swing, and the tip of the pointer (7) is bent.
(7) The forklift mast tilt angle display device, wherein (7 ') is movable along a cover (8) on the arc-shaped peripheral portion (13). The swing center (A) of the long link (10) is set near the upper edge of the base plate (2), and the swing center of the short link (12) is set.
2. The forklift mast inclination display device according to claim 1, wherein (D) is made coincident with the center of curvature of the arc-shaped peripheral portion (13) of the base plate (2). 3. A scale (9) is provided on a cover (8) of an arc-shaped peripheral portion of a base plate (2).
A forklift mast inclination angle display device according to the above. 4. The forklift mast tilt angle display device according to claim 1, wherein the length of the short link (12) is not more than half the length of the long link (10).