JPH0443123A - Roof structure of working vehicle - Google Patents

Abstract

PURPOSE:To prevent rattling of a roof and abrasion of sliding portion by relatively fixing a pair of oscillating members to form a lock mechanism for positioning and fixing a roof, pivoting a hook on one oscillating member in such a manner as to be oscillated and providing an engaging member for the forward end portion of the hook on the other oscillating member. CONSTITUTION:A parallel four-link mechanism A taking a pair of front and rear oscillating members 18,19 as opposite links is provided on a strut 17 for supporting a roof, whereby the height of the roof 4 is freely changed. There is provided a lock mechanism R for locking the link mechanism A in each of both postures, the working posture of raising a roof 4 where the longitudinal front and rear surfaces of the paired oscillating members 18,19 and the lowered storing posture. That is, the lock mechanism is constructed so that a hook 8 hook-shaped in plan view is pivoted on the front member 18 in such a manner as to oscillate in the lateral direction round the longitudinal axis P along the longitudinal direction and an engaging bar 21 elongated vertically, which is engaged with the forward end portion 20a of the hook 20, is fitted to the rear oscillating member 19.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the roof structure of a working vehicle, and more specifically, a parallel four-speed linkage mechanism in which a pair of front and rear swinging members are used as opposing links on a pillar that supports the roof. is provided, and the height position of the roof can be changed freely by the swinging of the parallel four-speed link mechanism, and a working posture in which the W root is raised and a storage posture in which the W root is lowered can be displayed. Regarding the roof structure of a certain work vehicle.

[Conventional technology]

Conventionally, the roof structure of this type of work vehicle was
A high position, such as that shown in Publication No. 14718,
In other words, the roof could be maintained in a fixed position only in the working position, and the roof could be maintained in position by its own weight in the lowered storage position.

[Problem to be solved by the invention]

However, when using a tractor in an orchard or a greenhouse, for example, the roof must be in a lowered position, but the roof bounces or rattles when traveling on uneven roads, causing noise and sliding. There are disadvantages in that the life of the parallel four-speed link mechanism on the roof of the work vehicle is likely to be shortened, such as the moving parts wear out quickly and the contact parts deform.

The present invention aims to solve the above-mentioned disadvantages.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a locking mechanism for fixing the roof in each of the two postures by relatively fixing the pair of swinging members in the roof structure of the work vehicle described at the beginning. In this structure, a hook having a hook shape in a plan view is pivotally supported on one member of the pair of swinging members so as to be swingable in the left and right directions around an axis along the longitudinal direction of the swinging member, and the hook has a hook shape in a plan view. The second swing member is characterized in that the other swing member is provided with an engagement member that can be engaged with the distal end portion in both the postures.

Alternatively, in configuring a locking mechanism for positionally fixing the roof in each of the two postures by relatively fixing the pair of swinging members, one member of the pair of swinging members is provided with a left and right axis. Can be swung up and down around the center.
Further, a hook having a hook shape when viewed from the side is pivotally supported so as to be slidable in the axial direction, and the tip of the hook extends toward the other swinging member, and the hook extends from the side surface of the other swinging member. An engaging member capable of engaging with the tip member in both the postures is protruded in a cantilevered manner, and slides into contact with the hook as the pair of swinging members move relative to each other, and the hook engages with the engaging member. The other swinging member may be provided with an inclined guide portion for slidingly moving the hook along the left-right axis so as to be able to engage with the mating member.

[Function] (a) In either of the configurations of claims 1 and 2, the roof can be locked and fixed in both the working position and the retracted position, so even if the work vehicle is run in the retracted position, Even if something happens, the W root will not become loose or rebound.

(El) In the locking mechanism of claim 1, since the hook is swung in the left-right direction to engage and release the engaging portion, the hook is moved in the left-right direction to engage and release the engaging portion. If the engagement is released, the hook and the engaging part will be shifted in their relative positions in the vertical direction and will no longer interfere with each other. Therefore, in order to change the attitude of the roof only by releasing the engagement, the link mechanism must be operated to swing. It can be made possible. Furthermore, because the hook and the engaging member do not interfere with each other while the link mechanism is moving due to the above-mentioned reason, the engaging part in both positions is made longer in the longitudinal direction of the swinging member and integrated, so that they can be constructed as one piece. It is possible to do so.

(C) The locking mechanism according to claim 2 has a structure in which the hook is swung in a direction along the moving direction of the link mechanism to engage and release the engaging portion. Since it can be moved in the axial direction, it can be operated so that the hook and the engaging part do not interfere even if the engagement is released and the link mechanism is moved.In addition, by providing an inclined guide, the roof can be locked. If the hook is moved to the position, the hook will automatically move laterally, and as a result, the hook can be engaged with the engaging portion only by swinging in the vertical direction without any operation to move the hook laterally. can.

(D) In either of the configurations of claims 1 and 2, since a single hook as a locking mechanism can function, when locking the roof in both positions, means for separately providing a locking mechanism for both positions. It is possible to simplify the structure and reduce costs compared to the previous model.

〔Effect of the invention〕

In the roof structure of a working vehicle according to claims 1 and 2, the durability of the roof and its parallel four-link mechanism is improved by the effect of (a), and the riding feeling is improved by reducing noise, and the effect of (d) is also achieved. There is also the advantage that the locking mechanism can be configured economically and rationally.

In the roof structure of a working vehicle according to claim 1, the locking operation of the locking mechanism can be simplified by the effect of (+7), and the engaging portion can be made into one component to further simplify the structure and reduce costs. is also possible.

In the roof structure of a working vehicle according to claim 2, the effect of (c) allows the hook to be configured to swing from side to side, yet the locking operation for engaging with the engaging portion can be made convenient by only one-way operation. .

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 4 shows a pack hoe which is an example of a working vehicle according to the present invention. This backhoe has a swivel base (1) mounted on the traveling body that can rotate freely around the vertical axis, an excavation work device (2) attached to the swivel base (1), and a driving unit (3) mounted on the top. and a roof (4).

The excavation work device (2) includes a swing bracket (13
boom (8), arm (9), and bucket) which are installed to be able to be stored and swung through the
(10), and the drive operation of this excavation work equipment (2) and swivel table (1) is hydraulically controlled by operating a control lever (12) that is installed on the side of the driver's seat (11) and can be tilted forward and backward. It is configured to perform this by controlling the pulp (not shown).

For reference, the control tower (14) to which the control lever (12) is attached can be tilted back and forth and locked around the horizontal axis (χ), and there is a tilt lock release lever (15) on the side. and a grip (16). In other words,
When you squeeze the grip (16), you also squeeze the release lever (15), which releases the tilt lock, and then the cylinder (
16) to tilt the control tower (14).

Next, the support structure of the roof (4) will be explained.

As shown in FIGS. 1 and 2, a pair of front and rear swing members (18) are attached to the pillars (17) that support the roof (4).

Parallel four-link mechanism (A) with (19) as the opposing link
is provided, and the height position of the roof (4) can be freely changed by swinging this parallel quadruple link mechanism (A).

A pair of swinging members (1) in the link mechanism (A)
8) and (19) are both in the working position with the roof (4) raised (Fig. 1) and the stowed position (Fig. 2) in which their longitudinal front and rear surfaces overlap and contact each other. A locking mechanism (R) is provided for locking the linkage mechanism (A) in both postures.

As shown in FIG. 3, the locking mechanism (R) includes a front member (1) of a pair of swinging members (18) and (19).
8), a hook (20) having a hook shape in a plan view is pivotally supported so as to be swingable in the left-right direction around the vertical axis (P) along the longitudinal direction, and the tip (20a) of the hook (20) The hook (20) extends toward the rear swinging member (19), and the hook (20) is attached to the rear swinging member (19) in both positions.
A vertically long engagement bar (
21) is the installation. These hooks (20) and engagement bars (21) are housed in back-and-forth swinging members (18) and (19) made of channel material with a cross-sectional shape, and the inclined holes (20b) of the hooks (20) It acts on the left and right axis (Y
) L-shaped handle that can be swung around (2
The locking mechanism (R) is engaged and disengaged by swinging the hook (20) by the up and down operation of 2).

[Another example]

As shown in FIGS. 5 and 6, the locking mechanism (R) is
A hook (20) having a hook shape in side view is pivotally supported on the front swinging member (18) so that it can swing up and down around the left and right axis (Z) and can slide freely in the axis direction. , that hook (
The tip (20a) of 20) extends toward the rear swinging member (19), and the inner lateral surfaces (25), (25) of the rear swinging member (19) have the above-mentioned both positions. Upper and lower engagement pins (23) that can be engaged with the tip (20a) at
, (23) are cantilevered and protruding from mutually different surfaces, and a pair of swinging members (18).

(19) comes into sliding contact with the hook (20) due to relative movement;
The hook (20) is aligned with the left and right axis (Z) so that the hook (20) can engage with the engagement pins (23), (23).
) A vertically inclined guide part (24) that slides along the
, (24) may be formed inside the rear swinging member (19).

A left-right gap larger than the thickness of the hook (20) is formed between the tips of the upper and lower engagement pins (23), (23), and in this gap, the hook (20) is connected to the swinging member (18). , (19) is movable in the vertical direction.

Further, the upper and lower engagement pins (23) and (23) may be provided on the same side, and in that case, the upper and lower inclined guide portions (24)
, (24) are preferably sloped surfaces in opposite directions.

In the present invention, the engagement bar (21) and the engagement pin (23) are collectively referred to as an engagement member (S).

Further, the present invention may be applied to a tractor.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the roof structure of a working vehicle according to the present invention,
Figure 1 is a cross-sectional side view showing the structure in the working position, Figure 2 is a cross-sectional side view showing the structure in the retracted position, and Figure 3 is a cross-sectional side view showing the structure in the storage position.
The figure is a cross-sectional view of the parallel quadruple link mechanism showing the movement of the hook.
FIG. 4 is a side view of the backhoe, FIGS. 5 and 6 are cross-sectional side views of a parallel quadruple link mechanism showing different embodiments, and FIG. 7 is a rear view showing a hook according to another embodiment. (4)... Roof, (17)... Pillar,
(18), (19)... Swinging member, (20
)...Hook, (20a)... Tip part, (24)... Inclined guide part, (25)...
...Side surface, (A) ...Parallel four-link mechanism, (P), (Y) ...Axis, (R) ...
...Lock mechanism, (S)...Engagement member.

Claims (1)

[Claims] 1. A parallel four-link mechanism (A) having a pair of front and rear swinging members (18) and (19) as opposing links is provided on the pillar (17) that supports the roof (4), This parallel quadruple link mechanism (
A) A work in which the height position of the roof (4) can be freely changed by swinging, and a working position in which the roof (4) is raised and a storage position in which the roof (4) is lowered can be displayed. The roof structure of a car, wherein the pair of swinging members (18
) and (19), the roof (4
) in each of the two postures, the pair of swinging members (18), (
A hook (20) having a hook shape in a plan view is pivotally supported on one member (18 or 19) of the members (18 or 19) so as to be able to swing in the left-right direction around an axis (P) along the longitudinal direction of the member (18 or 19). The tip (20a) of the hook (20) extends toward the other swinging member (19 or 18), and the tip (20a) is attached to the other swinging member (19 or 18) in both the postures. 20a) A roof structure of a working vehicle provided with an engaging member (S) that can be engaged with. 2. A parallel four-link mechanism (A) having a pair of front and rear swinging members (18) and (19) as opposing links is provided on the pillar (17) that supports the roof (4), and this parallel four-link mechanism (
A) A work in which the height position of the roof (4) can be freely changed by swinging, and a working position in which the roof (4) is raised and a storage position in which the roof (4) is lowered can be displayed. The roof structure of a car, wherein the pair of swinging members (18
), one member (18 or 19) of (19),
Can be operated vertically around the left and right axis (Y), and
A hook shaped like a hook when viewed from the side (20
), the tip (20a) of the hook (20) extends toward the other swinging member (19 or 18), and the side surface of the other swinging member (19 or 18) (
25) is provided with engaging members (S), (S) protruding in a cantilever shape that can engage with the tip end (20a) in both the postures;
In addition, as the pair of swinging members (18) and (19) move relative to each other, they come into sliding contact with the hook (20), and the hook (20) slides into contact with the hook (20).
0) can be engaged with the engaging members (18), (19) by slidingly moving the hook (20) along the left-right axis (Y). A roof structure of a working vehicle, in which the other swinging member (19 or 18) is formed with: