JPS6017422Y2 - Agricultural tractor safety frame fixing device - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of a safety frame for protecting the driver of an agricultural tractor in the event of a fall accident.

Due to its purpose, the safety frame is required to be strong enough not to deform due to shock even in the event of an unexpected fall accident, and its base is fixed to the rear axle housing, which constitutes the main strength support member of the aircraft body.

The safety frame is fixed to the rear axle housing after the entire tractor is assembled, and for transportation reasons, it is sometimes assembled at the sales destination after shipment from the factory.

Therefore, the structure requires a fixing method that is easy to install in a narrow space between seats and that can withstand falling accidents.

Previously, large-diameter bolts were used to secure the housing directly to the top of the rear axle housing, but this method had the problem of making it difficult to align the bolt holes and causing the bolt to shear and break from the base. .

In the present invention, the base of the safety frame is located at the rear side of the rear axle housing, and is fixed by a bracket, a short bracket, and a lower bracket, thereby solving the problem.

The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

Figure 1 is an overall side view of a tractor equipped with the safety frame of the present invention.

FIG. 2 is also a general rear view.

An engine 3 is built in a bonnet 1, a clutch housing 4 is fixed to the rear surface of the engine 3, and a rear axle case 5 is fixed to the rear surface of the clutch housing 4.

The front wheels 2, 2 are supported below the engine 3, and the rear wheels 18.18 are supported by a rear axle housing 6.6 that projects from the rear axle case 5 to both sides.

A drawbar 15 is provided on the lower surface of the rear axle case 5,
Further, the lower links 14, 14 and the top link 13 constitute a three-point link type work machine mounting device.

A lift link 12 is pivotally supported in the middle of the lower link 14, and the lift link 12 is moved up and down by rotation of a lift arm 11 protruding from a hydraulic device 9.

A seat 10 is supported on the upper part of the hydraulic system 9 so as to be slidable up and down and back and forth.

21 is a spring device for vertical sliding.

The user sits on the seat 10 and operates the steering handle 16 at the rear end of the hood.

Reference numeral 8 designates fenders that protect the left and right sides of the seat 10 from the rear wheels 18 and 18.

The safety frame 7 is a device for protecting the operator on the seat in the event that a tractor equipped with such a device overturns.

Reference numeral 17 denotes a step fixed to the side surface of the clutch housing 4 and the rear axle case 5.

The safety frame 7 of this invention has an upper support 7a and a lower support 7.
b, which are staggered in the left-right direction and bent in the front-rear direction at the joint between the upper support 7a and the lower support 7b.

As can be seen from the rear view, the upper support 7a side is formed to project outward from the lower support 7b side.

Figure 3 is an overall side view of the safety frame Figure 4 is an overall plan view of the safety frame Figure 6 is the overall rear view of the safety frame Figure 5 is the safety frame of the present invention applied to tractors with different rear axle housing heights A drawing showing the base when installed.

FIG. 7A is a side view of the lower support column 7b of the safety frame 7.

FIG. 7B is a bottom view showing the short and small bracket 71.

FIG. 8 is a rear view of the lower strut.

FIG. 9 is a plan view of the bracket 7f.

The safety frame of the present invention is structured around a lower support 7b, and a connecting bracket 7 is attached to the upper end of the lower support 7b.
e is reinforced and fixed with a diagonal reinforcing member 7n.

Further, a short and small bracket 71 is fixed to the lowest end of the lower support column 7b, and the short and small bracket 71 and the lower support column 7b are connected by a reinforcing plate 7S.

Reinforcement plates on the left, right, top and bottom parallel to the short and small bracket 71? pt.
It is supported by 7ot 7r and 7q, and has a bracket 7f protruding from it.

The bracket 7f has 11 holes for fastening bolts, etc., and the four holes 7n are used to fix the bracket 7f to the lower bracket 7g using bolts 7h' for fixing the fender 8. This is a dual-purpose hole.

The four holes 7 are temporary bolt holes for temporarily fixing the bracket 7f to the upper surface of the rear axle housing 6.

The three holes 71 are holes for inserting bolts 71' for fully tightening the bracket 7f and the lower bracket 7g.

When assembling the safety frame 7, first insert the lower support assembly shown in Figures 7 and 8 into the temporary bolt holes 7.
Temporarily fix it to the upper surface of the rear axle housing 6 using the brackets 7d and 7e for connecting the upper strut assembly.
After aligning the holes and fixing the upper and lower support assemblies with the
Fully tighten to the rear axle housing 6.

In the case of Fig. 3, the short and small bracket 71 and the lower bracket 7
Fig. 5 shows a state where the spacer 7j is inserted and fixed between the rear axle housing 6 and the rear axle housing 6 of another model of tractor, and the spacer 7j is removed and assembled. It shows.

As shown in FIG. 7B, the short and small bracket 71 has three holes, one of which is threaded.

Is the lower strut assembly the side strut 7c and the upper strut? a
, and a reinforcing member of 7 m, and the upper support column 7
The reinforcing member 7m of a and the reinforcing member 7n of the lower support column 7b are arranged diagonally parallel to each other.

The upper strut 7a extends outward from the lower strut 7b, and the reinforcing member 7m on the upper strut 7a side is fixed diagonally inward, and the reinforcing member 7n of the lower strut 7b is fixed outward. .

As described above, in attaching the safety frame 7 to the rear axle housing 6, the present invention extends the safety frame base to the rear of the rear axle housing 6 and close to the bottom surface of the rear axle housing 6, and extends the safety frame base from the base of the safety frame 7 to the rear. A bracket 7f is provided on the upper surface of the axle housing 6, and a short bracket 71 is protruded from the lower surface of the axle housing 6, and the bracket 7f and the rear axle housing 6 face each other vertically, and the rear axle housing is held by long bolts 71'. Since the lower bracket 7g is fixed to the lower surface of the rear axle housing and the short bracket 71 is fixed to the rearward protrusion of the lower bracket 7g, the following effects are achieved.

First of all, by inserting a spacer between the short and small brackets and the lower bracket, the same safety frame can be installed on tractors with different rear axle housing thicknesses.

Second, since the lower end of the upright safety frame is not attached to the bracket 7f on the rear axle housing as in the past, bolts can be provided on the entire surface of the bracket 7f for tightening. It can also be fastened to bolt holes provided on the top surface, increasing support strength.

Thirdly, the upper bracket protrudes integrally from the base of the safety frame, and the lower bracket is short and small, so first place the upper bracket on the rear axle housing and temporarily secure it to the upper surface of the rear axle housing with bolts. This eliminates the hassle of having to lift the heavy safety frame and align horizontal bolt holes.

[Brief explanation of drawings]

Fig. 1 is an overall side view of a tractor equipped with the safety frame of the present invention, Fig. 2 is an overall rear view, Fig. 3 is an overall side view of the safety frame, Fig. 4 is an overall plan view, and Fig. 5 Figure 6 is a diagram showing the base of the safety frame of the present invention when installed on tractors with different rear axle housing thicknesses, Figure 6 is an overall rear view of the safety frame, and Figure 7A is a side view of the lower strut 7b of the safety frame. 7B is a bottom view showing the short and small bracket 71, FIG. 8 is a rear view of the lower support portion, and FIG. 9 is a plan view of the bracket 7f. 7...Safety frame, 7a...Upper support, 7b...Lower support, 7dt7e...
・Connection bracket, 7m? n...Reinforcement member, 7k...Bolt hole for temporary abandonment, 71...
・Bolt hole for giving up.

Claims (1)

[Scope of utility model registration request] When attaching the safety frame 7 to the rear axle housing 6, extend the safety frame base to the rear of the rear axle housing 6, close to the bottom surface of the rear axle housing 6, and attach the bracket from the base of the safety frame 7 to the top surface of the rear axle housing 6. 7f, a short and small bracket 71 is similarly protruded from the lower surface position, and a lower bracket 7g, which faces vertically through the bracket 7f and the rear axle housing 6 and holds the rear axle housing with long bolts 71', is attached to the rear axle housing. Fixed to the bottom of the
A safety frame fixing device for an agricultural tractor, characterized in that the short and small bracket 71 is fixed to the rearward protrusion of the lower bracket 7g.