FR2458982A1 - PROTECTION AGAINST STONES FOR REVERSIBLE PLOWS - Google Patents

Abstract

INVENTION CONCERNING THE WORKING OF THE LAND. PROTECTION FOR REVERSIBLE PLOWS AGAINST STONES. A RIGHT-TURNING SOC AND A LEFT-TURNING ANOTHER 7 ARE ATTACHED TO A T-SHAPED HOLLOW LINK 1, WHICH CAN PIVOT AROUND FOUR SYMMETRICAL SUPPORT LOCATIONS 11 WITH RESPECT TO THE LONGITUDINAL AXLE. THIS LINKAGE IS HELD IN THE WORKING POSITION BY A SPRING 23 AND RETURNS TO THIS POSITION AFTER PIVOTING; IT IS CLOSED, IN THE REGION OF THE JOINT TO THE PLOW FRAME 8, BY A PLATE 30, PARALLEL, IN WORKING POSITION, TO THE PLANE PASSING THROUGH LOCATIONS 11 AND PROVIDED WITH A CENTRAL OPENING THROUGH WHICH A GUIDING ELEMENT GOES 28, 29 FIXED TO THE CHASSIS. APPLICATION TO THE REALIZATION OF SUCH PLOWS.

Description

The present invention, concerning the work of the earth, relates to

  a protection against stones, for reversible or Brabant plows, of a type in which a right-turning plow and a left-turn plow are fixed to a tubular-T-shaped drawbar, which can pivot around four housings or support locations located symmetrically

  relative to the longitudinal axis, the drawbar being

  held in working position by a spring and brought back after its deviation. With protections against stones of the kind mentioned above, the spring is

  disposed, or outside the tubular shaft and

  to the latter, or within that

  drawbar. In one or other of these forms of

  a rod rests inside the tubular drawbar and provides a counter-support for the spring and the drawbar. The drawbar is held in the four bearing seats by the spring. These four housings form double joints around which the drawbar can deflect upwards and laterally, the two movements can be moved overlay. This is a drawbar attachment, in which we use double joints called

  "open", the drawbar being maintained in the

  only by the force of the spring.

  In the operation obtained in practice with such protection against stones it can not only

  occur the deviation of the body of plow, in the-

  which the two lower supports are raised, but also superimpose a lateral component, which

  the drawbar is still supported by a location

  against the frame of the plow '. In known plows, during a subsequent deflection of the drawbar, in which it has again turned to the repositioning it may happen that the drawbar, by its supports, no longer apply to the existing support locations on the drawbar. This means, however, that the plow body has tilted and no longer retains the desired furrow. In order to avoid this slope, it is already known from German Patent No. 2,226,449 to mount on the frame of the plow a plate perpendicular to the rear end surface of the drawbar. This gives a guide in one direction, but it is also possible in this case that the repositioning of the plow body, in case the shaft has turned in the other direction, the bearings of the drawbar do not come anymore. rest in their locations. In fact, with the known device this could be avoided by still having a corresponding plate on the other side, but then there is the disadvantage that this plate opposite to the frame of the plow is not pressed against it. and therefore can not absorb the lateral forces that appear. The object of the invention is to establish a protection

  against stones of the kind mentioned in the

  troduction, which ensures, while retaining the possibility of a deviation of the drawbar on all sides, that it

  take his position fixed in advance by reaching his

normal study.

  This result is obtained according to the invention by the fact that the tubular shaft is closed, in the region of the articulation to the plow frame, by a plate located in the working position of the drawbar,

  parallel to a plane passing through the four

  support, this plate being provided with an opening

  central thread through which passes a guide element fixed to the frame. The opening is preferably formed with a circular shape. But it is also possible, without complication, to arrange the plate on the frame and the guide element on the

  drawbar, remaining within the scope of the invention.

  During the deflection of the drawbar, that it carries one or more support positions, the inner wall of the opening serves as a guide for the guide element,

  so that when the body of char-

  street, the drawbar automatically returns to apply in

  support housing. In order to achieve this result, the

  for example, the guide element may have a tapered shape, whose tip or cene may have a circular cross-section or four curved tapered surfaces, which may then be identical, when the

  support dwellings all have the same mutual spacing.

  If, for example, the support locations are arranged in a rectangular outline, the surfaces of the tip each facing the support locations must be set correspondingly to the

  corresponding radius of rotation, the radius in the direction of

  the pendulum may be consistent with that of the opening

  in the plate. But we already get sufficient guidance by not having support locations following a rectangle too large, which is almost

always the case.

  According to another advantageous embodiment of the invention the opening in the plate may also have an elliptical shape. In addition, the guide element does not need to be represented by a complete point; just use two parallel plates whose

  z5 outlines correspond to the tapered shape.

  Other advantageous provisions of the invention

will result from the following.

  The invention will be better explained and understood

  by the description of the example embodiment below,

  given in a non-limiting manner with reference to the drawings, in which: Figure 1 shows a tinon according to the invention, in side view, with a portion of the frame; FIG. 2 is a view from above of the front end of the drawbar and FIG. 3 shows a section along the line III-III of FIG.

figure 1.

  FIG. 1 shows a T-shaped drawbar 1 which consists of a hollow rectangular profile piece 2 and a tapered boot 3. On the drawbar part 2 two trapezoidal tees 4, 5 are welded for fastening. tails 6 of plowshares 7 of which only the one turning to the left has been represented. On the chassis

  of plow 8 was welded a boot 9 forming shoulder.

  the wall 10 of the boot 9 carries / hacune of its extremi-

  top and bottom, two eyeglasses or eyelets 11 through which studs pass

  12, 13. On these studs rests the drawbar boot 3 pre-

  The drawbar 1 can thus rotate around the studs 12 as well as around the studs 13.

  Lateral travel of the drawbar 3 can be done perpendicularly

  to them. This possibility of lateral deflection does not however need to be so great

  that the possibility of pivoting in the vertical direction

  cal. At the rear end of the drawbar is welded a cap 19 in which a lever 20 with several arms can pivot about a stud 21. The lever 20 doors at its front end, a counter-support 22 which is supported by a spring 23. Another end of the spring siappui on a contrappui 24 fixed in the interior of the drawbar 2. On the lever 20 acts, through a

  25, a rod 26 whose front end is articulated

  abutted on a stud 27. the stud 27 is fixed in two plates 28, 29, parallel between elless which are welded

  at the wall 10 of the boot 9. These plates 28, 29 constitute

  together with a plate 30, a guiding element is arranged in the drawbar 1 parallel to a plane passing through the bearing spectacles 11. This plate 30 has a central opening 31 whose edge serves to guide the outer faces of the plates 28 , 29. The outline of the plates 28, 29 corresponds to a semi-circular surface concentric to a bearing bezel 11, with a radius as indicated at 32

  in Figure 1. In the state of operation

  shown in FIGS. 1 and 2, the outer faces 33

  plates 28, 29 have only a small clearance in the opening

  As can be seen in Figure 1, the drawbar 1 can pivot very far in the vertical direction about the axis 11. On the other hand the possibility of pivoting around two bearing glasses located vertically one to the above the other exists only in a certain angular zone as indicated in Figure 2. Such a zone

  However, angularity is totally sufficient because deviations

  side effects of the drawbar are relatively low

  during operation in practice.

  The contours of the plates 28 and 29 have a substantially conical tapered shape. In other words, they represent the remains of a cone from which lateral and central parts were cut off. This is necessary

  in this case, in order to fix the rod 26.

  In addition, therefore, a substantially

  best for the vertical pivoting of the drawbar. The open-

  31 of the plate 30 has a circular shape in this

  exemplary embodiment. But it can be as elliptical

  tick. In this case the plates 289 29 will have an outline

different correspondent.

  In addition it is also possible to replace the

  plate 30 through the wall 10, in which case an

  corresponding window 31 should be provided. The guiding element formed by the plates 28 and 29 would then be

  attached to the drawbar 1. The operation of the device

  In this case, it would be identical to the one indicated here.

R E V E N D I 0 A T IO N S

  1. Protection against reversible plow stones, in which a right-turning plow and a left-turn plow are attached to a T-shaped tubular drawbar, which can pivot about four symmetrical bearing positions in relation to one another. to the longitudinal axis, the drawbar being held in the working position by a spring and returned to this position after its pivoting, characterized in that

  that in the region of the articulation to the chassis of

  street (8) the tubular shaft (1) is closed by a plate (30) located in the working position of the drawbar (1),

  parallel to a plan passing through the four

  support members with hinge (11), which plate is provided with a central opening (31) through which a guide element (28, 29) secured to

chassis (8).

  2. Protection against stones according to the

  1, characterized in that the guide element (28, 29) is fixed to the drawbar and that the plate (3-0) is

attached to the frame.

  3. Protection against stones according to the

  1 or 2, characterized in that the guiding element (28, 29) has a tapered shape, its passing point

  through the opening (31) in the plate (30).

  4. Protection against stones according to the

  3, characterized. that the lateral surfaces of the tip are constituted by four surfaces of spherical segments whose radii are equal to their

  spacings in relation to the corresponding support

  and that the radii of the curvature surface, in the perpendicular direction, are equal to the radius of the opening (31) in the plate (30) or smaller than

this ray.

  5. Protection against stones according to the

  1 or 2, characterized in that the element of

  The guide consists of two plates (28,29)

  the contours of which correspond to portions

of earth.

  6. Protection against stones according to the claim

  5, characterized in that the plates (28, 29) are arranged parallel to the support locations

  (11) located vertically one above the other.

  7. Protection against stones according to one

  Claims 1 to 6, characterized in that the plate

  (30) is disposed in the immediate vicinity of

supporting elements (11).

  8. Protection against stones according to one of the

  claims 1 to 7, characterized in that the opening

  ture (31) is set in the plate (30) with a circular or elliptical shape