GB2161353A

GB2161353A - Improvement to "non-stop" reversible ploughs

Info

Publication number: GB2161353A
Application number: GB08516414A
Authority: GB
Inventors: Charrues Naud; Bernard Naud
Original assignee: NAUD EXPL CHARRUES
Current assignee: NAUD EXPL CHARRUES
Priority date: 1984-06-29
Filing date: 1985-06-28
Publication date: 1986-01-15
Also published as: GB2161353B; DE8518582U1; DE3522933C2; ES8608772A1; CH662467A5; GB8516414D0; FR2566617B1; DE3522933A1; FR2566617A1; ES544682A0; BE902780A

Abstract

A reversible plough includes a beam 6 which can pivot about one of two pivots 3 and 4 against the bias of an elastic return device on a working share contacting an obstacle. The elastic return device consists of a spring 11 arranged inside the beam 6 and compressed inside the beam against a stop 12 by a compression rod 13 connected to the frame 1 by means of a link 18 articulated with the rod 13 and the frame 1; the pin 17 articulating the link 18 with the rod 13 is integral with a guiding component in the form of a sliding block welded to the front end of the rod 13 and arranged in the front end of the beam 6. <IMAGE>

Description

SPECIFICATION Improvement to "non stop" reversible ploughs The present invention relates to an improvement to "non-stop" reversible ploughs and more particularly to the elastic return device of the articulated beam.

Most of the known "non-stop" reversible ploughs comprise two pivot pins and an elastic return device which also serves as an element for mounting the beam on the frame of the plough.

The pivoting of the beam about one of the pivot pins, when the ploughshare encounters an obstacle, causes an increase in the energy contained in the elastic mounting device and this energy is used to bring the ploughshare back into the normal working position after the obstacle has been passed over.

The known elastic devices, which are of the type described in the patent FR-A 2,373,217 of the applicant, comprise a helical spring arranged in the beam and compressed inside the latter by means of a rod articulated with the frame, between the two pivot pins. The rod extends inside the spring, over practcially the entire length of the beam, and has an adjustable washer which rests against the rear end of the spring, the front end of the spring resting against a stop arranged inside the beam, towards the front, and not very far from the articulation point of the rod.

With this type of elastic device, the amplitude of the beam's movement is limited and this limitation is a result of the fact that the rod which compresses the spring has only a very small angular clearance at the point where it is articulated with the frame.

In order to remedy this difficulty, several systems are known, such as, for example, the system described in the document FR-2,386,238 where the rod is connected to the frame by means of a link with which it is articulated.

Another more complex system described in the document FR-2,285,795 also comprises a rod consisting of two parts on either side of a roller which travels inside the beam; in this system,the elastic element is of the type consisting of a hydraulic accumulator and is arranged outside the beam, at the rear.

Another system described in the document DE3,124,314 consists of a rod articulated with the frame between the two pivot pins, and this rod acts directly on a piston which is arranged at the front of the beam and which compresses the helical spring located inside the beam. This system can be applied to a "non-stop" type plough which is different from that of the applicant in that the pivoting of the beam, when the ploughs are encounters an obstacle, takes place about the pin located beneath the middle axis of the plough.

The invention aims to improve "non-stop" reversible ploughs of the type comprising a spring which is arranged inside the beam and which is compressed by a rod extending inside the said spring over practically the entire length of the beam.

The aim of the invention is to produce a device which has astonishing mechanical efficiency and which fully satisfied the requirements of non-stopping reversible ploughs.

According to the invention, the rod which compresses the spring consists of two parts: -a rod extending inside the spring; -a link articulated with the frame, between the two pivot pins, these two parts are arranged on either side of a guiding component which performs a translational movement and is arranged inside the beam towards the front; this guiding component is in the form of a sliding block welded to the front end of the rod extending inside the spring and is integral with the link by way of an articulation in the form of a cover-piece.

According to a preferred arrangement of the invention, the sliding block consists of two shoes in the form of substantially square plates welded directly to a cover-piece which is integral with the front end of the rod and which comprises the hinge pin for the link.

The invention will be better understood with the aid of the description and attached drawings which are given by way Of example and in which; Figure 1 is a partial view of the "non-stop", reversible plough according to the invention, with the beam shown in cross-section; Figure 2 is a perspective view of the sliding block according to the invention.

As shown in Figure 1, the frame 1 conventionally comprises flanges 2 on which the pivot pins 3 and 4 are arranged and also comprises a pin 5 with which the elastic coupling and return device of the beam is articulated.

The beam 6, which is in the form of a hollow beam with a square cross-section, supports two struts 7 and 8 at its rear end. The other end, at the front, has on either side the flanges 9 on which the bearing surfaces 10 are arranged in a conventional manner, these bearing surfaces ensuring, on the one hand, that the beam rests on the pins 3 and 4 of the frame and, on the other hand, that the beam is guided on the same pins during pivoting.

The elastic device consists of a spring 11 which is arranged inside the beam; it rests against the stop 12 welded inside the beam, in the front part.

Compression of the spring 11 is performed by the rod 13 which is arranged in the centre of the spring and which extends almost the entire length of the beam. At the rear of the beam, the rod is threaded and has a washer 14 resting against the spring 11 and an adjusting nut 15. The rod 13 passes through the stop 12 at the front and has a cover-piece 16 which carries a pin 17 with which the small end of the connecting rod 18 is articulated, the other end, or big end, of the connecting rod 18 being articulated with the pin 5 of the frame.

The hinge pin moves inside the beam 6, while remaining along the general axis 19 of the said beam, by means of a guiding component in the form of a sliding block consisting of two shoes 20 (Figure 2) directly integral with the cover-piece 16.

The shoes 20 are parallel with each other and are in the form of substantially square plates which make direct contact with the inside walls of the beam. The plates are, for example, welded to the cover-piece 16, parallel to the pin 17 and to the general axis 19.

In the normal working position, the sliding block is located inside the beam 6, in the vicinity of the stop 12 against which the spring rests; it moves towards the front end of the beam as the latter pivots upon encountering an obstacle. In the maximum pivoting position, that is to say when the tip of the ploughshare reaches the level of the frame, the sliding block is located at the edge of the beam, at the front.

It goes without saying that the guiding component may, without changing the nature of the invention, be in a form other than a sliding block and consist, for example, of two rollers mounted on either side of the cover-piece 16 on the hinge pin 17.

Claims

1. "Non-stop" reversible plough of the type comprising a beam pivoting about two horizontal pins and arranged on the frame on either side of its main pin, and a helical return spring which is housed inside the beam and is compressed between a stop fixed towards the front of the said beam and a mobile washer integral with the end of a pulling rod consisting of two parts: -an elongated rod extending inside the spring, -and a link articulated with the frame between the two pivot pins and, the said two parts being arranged on either side of a guiding component which performs a translational movement and is located at the front of the beam, characterised in that the guiding component is in the form of a sliding block welded to the front end of the rod and integral with the link by way of an articulation.

2. "Non-stop" reversible plough according to Claim 1, characterised in that the sliding block consists of two shoes in the form of substantially square plates welded directly to a cover-piece, this cover-piece being integral with the rod and comprising the pin for hinging the link.

3. A "non-stop" reversible plough substantially as hereinbefore described with reference to the accompanying drawings.