GB2038601A

GB2038601A - Locking means for reversible plough

Info

Publication number: GB2038601A
Application number: GB7942611A
Authority: GB
Original assignee: Fiskars Oyj Abp
Current assignee: Fiskars Oyj Abp
Priority date: 1978-12-29
Filing date: 1979-12-11
Publication date: 1980-07-30
Also published as: SE7910669L; DE2949696A1; FI784039A; NO794040L; FR2445099A1; FI58245B; FI58245C; DK546279A

Abstract

A locking means for a reversible plow, wherein the share frame (13) bears against the plow body (7) through two independent link systems (4, 5 and 4', 5') and whereby the share frame (13) can be turned up when a force is directed towards a point on the lower share, comprises lever elements (9, 12, 9', 12') pivotable in the vertical plane and provided with a hook (9, 9') engageable with a stop (10, 10'). The lever elements are controlled so that the upper element (9, 12), due to gravity, always is turned to the locking position and the lower one (9', 12') is disengaged. <IMAGE>

Description

SPECIFICATION Locking means in a reversible plow provided with a release mechanism The present invention relates to a locking means ir-a reversible plow provided with a release mechanism of the type in which the inner end of the share frame under a spring load bears against a section of the plow body through two vertically spaced link systems independent of each other and permitting the share frame to be turned up preferably in a vertical plane in relation to the plow body at the upper link system under the action of a sufficiently great force F directed towards the point of the lower share.

A reversible plow of the above-mentioned type is schematically illustrated in the accompanying drawing figures 1 and 2 showing a reversible plow construction in side view and top view, respectively.

Between the points C and D in a release mechanism 1-6, a pressure element 1 is inserted which through an arm 2 produces a tractive force P in a drawbar3 (Figure 2). This force P is taken up by pivots 4 and 4' on a share frame 13 bearing against corresponding pivot cradles 5 and 5' in a plow body 7 (Figure 1). The holding moment is P x a > F x b G x c. By means of a clamp bolt 6, the drawbar force (holding force) P can be increased or reduced, whereby the share will be released by applying forces F of corresponding magnitudes on the share point 8'. The share will be released when the moment F x b exceeds the moment P x a + G x c wherein G is the weight of the share frame 13 andc is the horizontal distance from the pivot axis 4 of the upper link system to the centre of gravity Tp of the share frame 13.

During the release, the share frame 13 turns around the upper pivot 4 aud moves outwards in relation to the drawbar 3, which is pivotally mounted on the plow body 7 in point 14. In this way, a compression of the pressure element 1 is produced by means of the arm 2. Said element 1 is so constructed that the force applied by it decreases the more it is compressed. Hereby, the drawbar force P which forces the inner end of the share frame 13 against the plow body 7 is reduced. However, this increases the risk that the pivots 4 and 4' of the share frame 13 will turn out of their pivot cradles 5 and tri', respectively, for example, due to a lateral force Q (Figure 2), in which case the plow device will become unserviceable.

It is the object of the present invention to eliminate this disadvaneage and to provide in a simple and reliable manner a locking of the share frame to the plow body also in the released position of the share frame.

;The invention is based on the idea that a gravitycontrolled latch system automatically locks the upper link system so as to prevent an unintentional lateral turning of the share frame.

More precisely, the invention is mainly characterized by the locking means comprising two latch systems located in the working position of the plow vertically above one another on each side of the geometrical longitudinal axis passing through the share frame, the latch systems being shaped as lever elements pivotable in the vertical plane and each provided with a hook or similar engaging a stop in the locking position, and each lever element being so controlled by its weight load that the upper lever element always is turned to the locking position, while the lower element is released.

However, when defining the the scope of protection, the present specification and the appended claims are to be considered in their entirety according to the provisions of the Patents Act.

The biggest advantage of the locking means according to the invention is that it is because of its gravity control, all-automatic and at the same time fool-proof.

The invention will now be described in more detail with reference to the accompanying drawing figures 3 and 4 illustrating in vertical section two embodiments of the locking means according to the invention.

The locking means according to Figure 3 comprises in principle two latch systems 9-12 and 9'-12', one in connection with each link system 4, 5 and 4', 5', respectively. Each latch system comprises one or two substantially vertically pivoting latches 9, 9' and, correspondingly, one or two pin elements 10, 10'.

The pivot axes 4, 4' of the latches 9, 9' and the corresponding pin elements 10, 10' are located on dif ferent sides of the contact surface between the inner end of the share frame 13 and the plow body 7.

Each of the latches 9, 9' is provided with a coun terweightcomprising an outer spherical part 11, 11' and an inner stem part 12,12'. The counterweights 11, 12, 11', 12' together with their corresponding latches 9, 9' form double-arm levers. Due to the action of gravity on the counterweight 11, 12, the upper latch 9 is always in locking engagement with the pin element 10. In a corresponding manner, the lower latch 9' is always held out of engagement with its corresponding pin element 10'. By means of this arrangement, the upper latch system 9, 10 will in its locked position prevent an unintentional lateral turning of the share frame 13.

In the embodiment described, the latches 9 and 9' are journalled on the share frame 13, while the pin elements 10 and 10' are located on the plow body 7.

Of course, the arrangement can also be the opposite, i.e. that the latches 9 and 9' are journalled on the plow body 7, whilethe pin elements 10, 10' are located on the share frame 13.

In the event that each latch system comprises two latches 9 and 9' and two pin elements 10 and 10', respectively, the latches are appropriately arranged on the outer sides of the inner end of the share frame 13. If, on the other hand, each latch system comprises only one latch 9, 9' and one pin element 10, 10', the latches 9, 9' and pin elements 10,10' are appropriately arranged in a vertical plane located inside the outer sides of the inner end of the share frame.

In the embodiment shown, the link systems 4, 5 and 5', one hand, comprises two horizontal pivots 4, 4' spaced above one another at the inner wend of the share frame 13 and, on the other hand, two corresponding horizontal pivot cradles 5, 5' arranged on the plow body 7.

A particularly advantageous embodiment is obtained if the axes 4 of the latches 9 and 9' coincide with said pivots (Figure 3). In this case, the locking takes place automatically at the upper pivot 4 when the plow is shifted from one plowing position to the other. In a corresponding manner, a simultaneous unlatching- of the latch 9' takes place at the lower pivot 4'.

In addition, it could be mentioned that the latch systems 9, 10 and 9', 10' are appropriately mirrorsymmetrically arranged with respect to a horizontal central plane passing through the share frame 13 and the plow body 7.

Figure 4 illustrates an alternative embodiment of the locking means according to the invention. In this embodiment, the latches are shaped as sinale-arm levers which, in their upper position, under the action of the gravity G, are arranged to engage with their hookshaped end 9 a stop 10 arranged in the plow body 7. In its lower position, the latch is disengaged in a corresponding manner under the action of gravity from its engagement with the stop 10'.

Claims

1. A locking means in a reversible plow provided with a release mechanism of the type in which the inner end of the share frame under a spring load bears against a section of the plow body through two vertically spaced link systems independent of each other and permitting said share frame to be turned up preferably in a vertical plane in relation to said plow body at the upper link system under the action of a sufficiently g reat force F directed towards the point of the lower share, said locking means comprising two latch systems located in the working position of the plow vertically above one another on each side of the geometrical longitudinal axis passing through said share frame, said latch systems being shaped as lever elements pivotable in the vertical plane and each provided with a hook or similar engaging a stop in the locking position, and each lever element being so controlled by its weight load that the upper lever element always is turned to the locking position, while the lower one is released.

2. A locking means as claimed in claim 1, wherein each latch system is arranged in connection with one of the said two link systems and each comprises at least one mainly vertically pivotable latch or similar, the pivot axis of said latch and the corresponding stop being located on different sides of the contact surface between the inner end of said share frame and said plow body, said latch being provided with a counterweight which together with the latch forms a double-arm lever so that of the latch or latches the upper one or ones, under the action of gravity on the counterweight, always is/are in locking engagement with the corresponding stop, while the lower one or ones in a corresponding manner is/are held out of engagement with the corresponding stop, the upper latch system thereby in its locked position preventing an unintentional lateral turning of the share frame.

3. A locking means as claimed in claim 2, wherein said latch systems are mirror-symmetrically arranged in relation to a horizontal central plane passing through the share frame and the plow body.

4. A locking means as claimed in claim 2, wherein said latches are journalled on said share frame, while said stops are located on said plow body.

5. A locking means as claimed in claim 2, wherein said latches are journalled on said plow body, while said stops are located on said shares frame.

6. A locking means as claimed in claim 2, wherein each latch system comprises two latches and two stops, said latches being journalled on the outer sides of the inner end of said share frame.

7. A locking means as claimed in claim 2, in which each latch system comprises a latch and a corresponding stop, wherein said latches and stops are arranged in a vertical plane inside the outer sides of said share frame.

8. A locking means as claimed in claims4 and 6, in which said link systems comprise horizontal pivots spaced one above the other at the inner end of said share frame and corresponding horizontal pivot cradles arranged on said plow body, wherein the axes of said latches coincide with said pivots.

9. A locking means as claimed in claim 2, wherein said counterweights comprise an outer spherical part and an inner stem part.

10. A locking means as claimed in claim 1, wherein said stops comprise pin elements or similar.

11. A locking means as claimed in claim 1, wherein each latch system is arranged in connection with a link system and each comprises at least one substantially vertically pivotable latch or similar, the pivot axis of said latch and the corresponding stop being located on different sides of the contact surface between the inner end of said share frame and said plow body, and the latch forming a single-arm lever so that of said latches the upper one or ones, under the action of gravity G, always is/are in locking engagement with the corresponding stop, while the lower one or ones in a corresponding manner is/are held out of engagement with the corresponding stop, the upper latch system thereby in its locked position preventing an unintentional lateral turning of the share frame.