JPH045370Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sunshade structure for a working vehicle in which the height of a canopy provided above the driving section is adjustable.

[Conventional technology]

As a conventional awning structure, for example,
As disclosed in Publication No. 21620, a quadruple link mechanism including a pair of front and rear vertical link members is incorporated into a column supporting a canopy, and the quadruple link mechanism is configured to maintain the canopy in a substantially constant posture. Some models have a canopy that can be switched between an upright position and a tilted position in the front and rear directions, and the height of the canopy can be adjusted between a high position for normal operation and a low position for storage. .

[Problem that the invention attempts to solve]

In such a conventional awning structure, even in a normal operating state with the quadruple link mechanism upright, the front and rear vertical link members of the quadruple link mechanism are spaced apart and can swing back and forth, making it difficult to maintain the upright position. A pin lock mechanism prevents either the front or rear vertical link members from swinging relative to the fuselage for maintenance purposes.

Therefore, when fixing the four-link mechanism in an upright position, it is first necessary to align the four-link mechanism and the pin lock mechanism, making the locking operation time-consuming.

Furthermore, when the four-link mechanism is in the upright and locked state, the front and rear vertical links tend to vibrate independently due to the backlash of each pivot.

The present invention aims to solve the above-mentioned problems of the conventional structure.

[Means for solving problems]

The sunshade structure according to the present invention incorporates a quadruple link mechanism having a pair of front and rear vertical link members into a column that supports a canopy, and maintains the canopy in a substantially constant posture to erect the quadruple link mechanism. The sunshade structure for a working vehicle is configured to be switchable between a posture and a tilted posture in the longitudinal direction, and is configured such that the front and rear surfaces of a pair of front and rear vertical link members are in contact with each other in the upright posture. It has characteristics.

[Effect]

According to the above configuration, when the four-link mechanism is raised toward the vertical position, the front and rear vertical link members come into contact with each other and cannot swing any further. This state is the normal operating state with the canopy in a high position, and the lock can be applied here as appropriate. Further, the front and rear vertical link members of the quadruple link mechanism locked in the vertical position are brought into contact with each other in the front and back to achieve integration, and the vertical link members vibrate due to the backlash of their respective pivot parts. Things will go away.

[Effect of idea]

Therefore, according to the present invention, when setting the four-link mechanism to a predetermined standing position, no special positioning operation is required, and it has become possible to lock the four-link mechanism in a predetermined standing position easily and quickly. In addition, it has become possible to suppress vibrations caused by rattling at each link pivot in the standing position.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 3, the front part of the vehicle body is equipped with an engine E at the front, a driving section 1 at the center, and a clutch housing 2 and transmission case M sequentially arranged from the engine E toward the rear. Steering front wheel 3
An agricultural tractor is constructed by providing rear driving wheels 4 at the rear of the tractor.

A pair of left and right columns 6, 6 are erected on the rear and lateral sides of the seat 5 provided in the driver's section 1, and a canopy section 7 serving as a sunshade is supported in a cantilevered manner on the upper ends of these columns 6, 6. be.

Each support column 6 is specifically constructed as shown in FIGS. 1 and 2. That is, a pair of upper and lower struts 62 and lower struts 63 which are made of square pipes with a rectangular cross section and are divided into upper and lower parts, and square pipes with a square cross section that can be fitted into the upper and lower struts 62 and lower struts 63 as a pair. Using a pair of front and rear vertical link members 61, 61 consisting of
2 and the vertical link member 61 between the lower column 63,
61 are pivotally connected at their upper and lower ends by fulcrum pins 64 . . . to form a quadruple link mechanism A, and thus each support column 6 is constructed.

The pillar 6 can take an upright position (the position shown by the solid line in FIG. 1) while maintaining the canopy part 7 in a substantially constant position by the action of the four-link mechanism A, and can also move forward. It is designed so that it can assume a tilted posture (the posture shown by the imaginary line in FIG. 1).

Moreover, in the upright position, the front and rear surfaces of the pair of front and rear vertical link members 61, 61 are in contact with each other as shown by the solid line in FIG. 1 or as shown in FIG. 2.

When the sunshade structure for a working vehicle has such a structure, the front and rear surfaces of the pair of front and rear vertical link members 61, 61 are in contact with each other in the upright position, so that the pair of vertical link members 61, 61
It now appears that the two are integrated. Moreover, in the upright position, the four-link mechanism A is in a stable state with the front and rear surfaces of the pair of vertical link members 61, 61 in contact with each other.

As shown in FIG. 4, one of the pair of front and rear vertical link members 61, 61 is tension-biased in the direction of the pivot pin 65b by a spring 65a, and is rotatable around the pivot pin 65b. A hook 65 is attached to the other end, and a latching pin 66 for latching the hook 65 is attached to the other end. By hooking the hook 65 to the latching pin 66 in the upright position, the quadruple link mechanism A becomes stable as described above, and is then latched and fixed by the hook 65. It's becoming like that.

Further, the pair of front and rear vertical link members 61, 6
1, a balance spring 67 is installed between diagonally located fulcrum pins 64, 64 so that a tensile biasing force acts between them, and the tensile biasing force of the balance spring 67 and the canopy part 7 As a result, the canopy section 7 can be easily changed in its attitude.

Furthermore, the pair of front and rear vertical link members 61, 61
A fulcrum pin 64 pivotally connects the upper and lower ends of the
The fulcrum pins 64, 64 that are related to each other among...
By appropriately changing the position of the four-link mechanism A, the forward rotation angle of the quadruple link mechanism A can be easily changed. That is, if the vertical distance a of the fulcrum pins 64, 64 shown in FIG. If the length is longer than , the rotation angle becomes larger.

[Another example]

○B In the above-described embodiment, the support 6 is configured so that it can take an upright position as well as a forward leaning position. It is also conceivable that the device be constructed so that it can take a certain posture.

○B The entire pillar 6 is a pair of front and rear vertical link members 6.
1, 61, the vertical link member 61,
61, the rear end of the canopy 7, and the rear end of the tractor main body to form the four-link mechanism A. If you do this,
The upper strut 62 and the lower strut 63 become unnecessary.

○C The horizontal cross-sectional shape of the pair of front and rear vertical link members 61, 61 can also be made as shown in FIG. That is, a concave portion 61a is formed in one vertical link member 61, and a convex portion 61b is formed in the other vertical link member 61, so that when the column 6 is in an upright state, the convex portion 61b is formed in the concave portion 61a. It is also conceivable to have a structure that can be engaged by fitting. In this case, when the support column 6 is in the upright state, the pair of front and rear vertical link members 61, 61 can be more reliably prevented from shifting in the lateral direction.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the sunshade structure for a working vehicle according to the present invention, and FIG. 1 is a side view of the main part, FIG. 2 is a perspective view of the main part, FIG. 3 is a side view of the entire working vehicle, and FIG. 4 is a side view of the main part. An explanatory diagram showing the hook portion, and FIG. 5 is a horizontal sectional view of the main part showing another embodiment. 6... Support column, 61... Vertical link member, 7... Canopy section, A... Quadruple link mechanism.

Claims (1)

[Scope of utility model registration request] A quadruple link mechanism A having a pair of front and rear vertical link members 61, 61 is incorporated into the column 6 that supports the canopy part 7, and the quadruple link mechanism A is erected while maintaining the canopy part 7 in a substantially constant posture. The sunshade structure for a working vehicle is configured to be switchable between a posture and a tilted posture in the longitudinal direction, and is configured such that the front and rear surfaces of the pair of front and rear vertical link members 61, 61 are in contact with each other in the upright posture. A sunshade structure for a work vehicle.