FR2624843A1 - Device for raising the rear of agricultural tractors - Google Patents

Abstract

The invention concerns a device for raising the right or left rear of agricultural tractors fitted with a hydraulic lift rapidly and in total safety. It consists of a curved arm 1 bearing on the ground via an upright foot 6, reinforced by a tie 3 and four spacers, made integral with the tractor's lifting arm by a pin connecting the fixing cap 7 transversely to the swivel joint of the lifting arm. It also consists of a wedge adjustable in length and in height by two hinged arms 12 and 14 connected by a stop piece 13 and resting on a sliding support 10. When the user causes his lift to move from low to high, the mechanical effort resulting from the traction created by the lifting mechanism is transferred to the ground by the adjustable wedge buttressed under the lifting arm.

Description

 DEVICE FOR LIFTING THE BACK OF AGRICULTURAL TRACTORS

 The present invention relates to a device for lifting the rear either right or left of agricultural tractors, provided with a hydraulic lift.

 Farm tractor users are increasingly feeling the need to quickly replace their rear wheels.

 The agriculture of today uses tractors of important power, equipped according to the time of the year, of wheels cages or twin, beet-makers, very broad. The lifting of the tractors for this intervention is usually carried out using mechanical or hydraulic jacks, requiring a long installation, tedious and often dangerous by its instability, for the user.

 The device according to the invention overcomes these disadvantages. By adopting new solutions and partially modifying other solutions, the present invention, by a simple mechanism actuated directly by the lifting of the tractor, makes it possible to quickly and safely raise and lower the rear axles, either right or left. these tractors.

 The characteristic of the invention consists of a structure in a metal tube with a belt (force arm), having at the lower end a plumb foot coming to bear on the ground. At the upper end of the power arm, a yoke pierced with several holes transversely receiving a pin, allows attachment to the ball joint of the tractor lifting arm. A tie rod fitted with four reinforcing struts connects the two ends of the force arm. A profile "U" fixed horizontally on the upper part of the force arm, also characteristic of the invention, will serve as a rail for the adjustable wedge.

 The main characteristic of the invention resides in a wedge adjustable in height, provided with a sliding support on the force arm.

This wedge consists of two articulated arms, brought together at their upper ends, by a stopper part pierced with several orifices receiving the articulation axes, coming to buttress under the lifting arm of the tractor.

 The lower part of the right arm is fixed, via a hinge pin, in two welded cages - a. A sliding part. At the lower part of the left arm is fixed a guide fork coming into abutment on one of the tabs welded transversely on the sliding part. It is thus easy to adjust the pitch height, by modifying the lower spacing of the two articulated arms.

 Other advantages and objects of the invention will be better understood with the aid of the description and the figures which follow, representing a preferred embodiment.

 Figure 1 is a partial schematic profile view showing a first embodiment of a device according to the invention of the force arm.

 Figure 2 is a partial schematic profile view showing a first embodiment of a device according to the invention of the adjustable wedge.

 Figure 3 is a partial schematic profile view showing the entire device mounted on a tractor.

 Figure 4 is a schematic perspective view of an embodiment of the device in use for the right rear wheel of a tractor.

 Referring to Figure i, we see a first embodiment of the invention of the force arm according to which the device comprises an arm, formed of a bent tube, having at the outside, a foot of plumb (6), welded perpendicular to the arm e -é (]). pulling (3), connects the two ends of the belted arm (1). Two spacers (4) formed by two flat bars and two spacers (5) formed by two tubes connect the arm (i) to the tie rod (3). A "U" profile (2) welded horizontally on the arm (1) constitutes the rail guiding the adjustment shim.

The fixing fork (7) pierced with two orifices (8) makes it possible, by means of the transverse pin (9), to hook the device to the ball of the lifting arm of the tractor.

 In Figure 2 is presented the adjustment shim, an important characteristic of the invention. This wedge consists of a sliding support (O) formed of a profile "U" coming to bear on the rail (2). On this support (10) are welded, at the left end, in parallel two cages (J.1) for fixing, drilled to receive transversely the axis (16) of the articulated arm (12).

At the moist end of the support (10) are welded perpendicularly, several small tabs (15), allowing precise setting of the guide fork (19), welded to the articulated arm (1S). The two articulated arms (12) and (14) are connected by a profiled part "C" (13) pierced at two points with two orifices receiving the pins (17) and (18) welded to the arms (12) and (14 ). The details of practical dimensions may vary without departing from the scope of the invention. All the elements
may be replaced by other equivalent technical elements.

In Figure 3, we can see the device as it is mounted on the tractor. The length of this device, measured from one end to the other, is such that the end at the vertical foot (6) can rest on the ground in front of the axis (C) of the tractor axle. Thanks to the sliding adjustment shim, the stop (13) can be brought as close as possible to the hinge pin (B) of the lifting arm (A). The effort thus requested of the device is reduced to the maximum. Adjusting the spacing of the two
as (12) and (14) allows to bring the stop (13) as close as possible under the lifting arm (A). Thus the lifting of all types of tractors is carried out as soon as the force is put into action and the climb stroke becomes maxImum in relation to the lift stroke.

By looking at Figure 4, you can see the new device in full use. The device slipped parallel under the arm
e lifting, made integral with it by the pin (9) of the yoke (7),
abutment (13) of the adjustable shim brought as close as possible under the lifting arm, the user only has to exert a maneuver from the bottom up his lifting mechanism to lift his tractor. The mechanical force resulting from the traction generated by the lifting mechanism is transferred to the ground via the adjustable wedge. The choice of the position of the lifting mechanism height will precisely adjust the lifting height of the rear right or left of the tractor.

Claims (6)

1) Device for lifting the right or left rear of agricultural tractors fitted with a hydraulic lift, characterized in that it consists of a one-piece upper arm, reinforced by a tie rod equipped with four spacers and one end a fixing yoke pierced with holes allowing by simple pinning to make it integral with the end of the lifting arm, at the other end of a plumb foot (By activating the lifting (rising position ), a traction exerted on the yoke will cause a push on the plumb foot.The adjustable shim, provided with a sliding support (10)  (12 and 14) on which are fixed two articulated arms joined by a stopper piece, allowing the height adjustment thanks to several tabs located perpendicularly on the support, comes to brace under the other end of the arm lifting. 2) Device according to claim 1 characterized in that the aforesaid upper arm is bent and formed in one piece. 3) Device according to claim 1 characterized in that the aforesaid belted arm is surmounted by a rail serving as guide and support for the adjustable wedge.  4) Device according to claim 1 and 3 characterized in that the above-mentioned adjustable wedge 2 consists of a sliding support coming to adapt on the r ai> of the upper bent arm. 5) Device according to claim 1 and 4 characterized in that the aforesaid wedge consists of two articulated arms joined by a (15) stop piece and adjustable by two different tabs placed for this purpose. 6) Device according to claim 1 characterized ink that its fixing yoke is intended to be assembled by simple pinning to the ball of the lifting arm of the tractor, thus making them integral.