GB2128862A - Harrow tine - Google Patents

Abstract

A tine (2) for a harrow frame is provided with a flanged head (20) of which in use one flange (21) is clamped between frame members of the frame section and bolted to them, the upper end of the tine (2) abutting the underside of one of the frame members for support against side deflecting movement of the tine. The head (20) is shown of inverted L-section with the depending flange (22) welded to a side of the upper end of the tine (2). If desired the head (20) maybe of T-section for supporting the tine (2) against side deflection in either direction. <IMAGE>

Description

SPECIFICATION Improvements in harrows The object of this invention is to provide improvements in harrows for obtaining their more effective operation and also more economic construction and practical advantages in these and other respects will be apparent from the following description.

According to one aspect of the inventionthetine carrying frame or a frame section of a harrow is provided with support structure mounted on its upperside for receiving one or more weights located thereonforobtaining and maintaining more effective engagement of the tines with the ground.

In accordance with another aspect of the invention tines of the harrow frame or frame section thereof are provided with a flanged head which is clamped between frame members of the frame or section, the tine itself ore head memberthereat being further arranged to abut the underside of a frame member for support against bending or deflecting movement.

A practical example of a harrow incorporating features ofthis invention is shown in the accompanying drawings in which: FIGURES 1 and 2 are plan view and side elevation of a typical arrangement of the harrow, FIGURE 3 is a detail view on an enlarged scale of weight securing means, FIGURE 4 is a perspectiveview of one of the tines on afurtherenlarged scale and, FIGURES is a detailed elevation of a tine mounted in position of use.

The harrowshown in the drawing comprisesthree side by side sections 1 each providing eight rows of downwardly directed tines or spikes 2 but the number of sections and rows may be varied according to requirements.

Each section 1 is ofthe usual lattice framework comprising a series of cross members 1 transverse to thedirection oftraveiling movementofthe harrow, which cross members 10 are connected in spaced apart relationship by inclined longitudinal members ortiebarsil.

Each section 1 is connected, e.g. by chain 3to a drawbar or, as shown, to the lower members 40 of a rectangularframe 4 provided with brackets 45 for connection to the three point implement linkage 5 of an agricultural tractor. To assist movement over the ground the drawbarframe 4 is provided with skids 44 at its underside.

For the purpose of one feature ofthis invention each harrow section 1 is provided at its centre part witch support structure 6 shown consisting of a transverse plate 60 upstanding from side members 61 bolted or otherwise secured to cross members 10 ofthe harrow section 1 The side members 61 are shown extending longitudinally overthe four central cross members 10 and in this way serve to strengthen or stiffen the lattice framework ofthe harrow section 1.

The upstanding plate 60 is adapted to receive one or more weights 7 mounted on it, the weights 7 shown being of the kind used for tractor front end loading for convenience as regards availability and further use of such weights. The slot 70 in each weight7 engages over the upstanding plate 60 and a retaining member 76 secured by a bolt71 to the underside oftheweight 7 extends underthe lower edge of the plate 60 to retain theweightin position.

Any suitable retaining or clamping means may be employed to hold each weight on a plate 60 whilst each support structure 6 is shown provided with side plates 62 to reinforce the plate 60 from the side members 61 and also ensure retention of a weight or weights 7 against side movement offthe plate 60.

The number of weights 7 employed can be selected according to requirements and for obtaining suitable weight distribution with each weight 7 readily fitted in position of use or removed as necessary.

The drawbarframe 4 is shown provided with rearwardly extending jibs 8 one over each harrow section 1 and from which a flexible member such as wire cord 81 is connected between the rearend of each jib 8 and a rear part of the corresponding harrow section 1, e.g. to the rear of a weight support structure 6 as shown.

The arrangement enables the complete harrowto be raised from the ground by appropriate operation of the tractor three point linkage 5 and when the harrow is lowered, each section 1 is free to follow ground undulation. In this connection thewire cord 81 preferably has some stiffness so that it does not drop when slack thus avoiding entanglement with tines 2 which might otherwise occur.

The central jib 8 is also shown provided with a pivoted stay or prop 80which can be swung over the rear end of the jib to a more or less vertical position with its foot 800 in contact with the ground in order to support the drawbarframe 4 and jibs 8 in the position shown, i.e. on hydraulic fluid pressure supply to the three point linkage 5 ofthetractor being released when the harrow is not in use.

Referring to a furtherfeature of the invention each tine 2 has a head in the form of an offsetflange 21 conveniently provided by a short length of an angle section 20 having its downwardly directed flange 22 welded transversely to a side ofthe upper end of the tine 2. The flange head 21 is provided with a bolt hole 210 and in position of use the flange 21 is sandwiched between harrow frame members, i.e. between a cross member 10 and an inclined tie bar 1 1,the bolt 9 passing through the frame members 10, 11 and flange 21 to secure them together in the general assembly of theframeworkofthe harrow section 1.

The rigid mounting of the flange head 21 in the frame and its rigid attachmentto the tine 2 supports or locates the latter against backward deflection and also against side deflection in the direction of the flange 21.

In order to supportthetine 2 against side deflection in the opposite direction, the upper end of the tine is shown abutting the underside of an upper frame The date of filing shown above is that provisionally accorded to the application in accordance with the provisions of Section 15(4) of the Patents Act 1977 and is subject to ratification or amendment at a later stage of the application proceedings.

member, viz: the associated cross member 10 so as to resist side deflection away from the flange head 21.

In some instances the flange head 21 is bolted between the rear end of an inclinedshorttie bar member 111 and a rear cross member 10 which tie bar 111 is suitably downwardly cranked for the purpose.

The tines 2 can be readily relaced when worn or damaged and their construction is such thatthey can be more cheaply produced than the conventional round section tine having a threaded mounting head.

The lower end of each tine 2 is shown relieved by rear chamfering our chisel point formation at 23.

Each tine 2 is shown of square cross section e.g. 13 mm or 16 mm (1/2"or5/8") square but may be of round or other suitable cross section. The head of the tine 2 may be of T-section for support against side deflection in either direction.

Claims (7)

1. Atine oforfora harrow frame orframe section thereofcharacterised bythetine being provided with a flanged head which is clamped and secured, such as by bolting, or adapted to be clamped and secured, between frame members of the harrowframe or frame section, the upper end ofthe tine itself or a flange ofthe head being further arranged to abutthe underside of frame memberforsupport against bending or deflecting movement.

2. Atineaccordingtoclaim 1 whereintheflanged head is provided by an angle section head member having one flange welded or otherwise secured to a side ofthetine at its upper end and at least one further flange clamped and secured, or adapted to be clamped and secured, between frame members of the harrowframe orframe section.

3. Atineaccording to claims 1 and 2 wherein the angle section head member is of inverted Section.

4. Atine according to claims 1 and 2 wherein the angle section head member is of T-section to provide oppositely directed flanges for supporting the tine against side deflection in either direction.

5. Atine according to any the preceding claims wherein the tine itself is of substantially square cross section.

6. Atine according to any ofthe preceding claims wherein the lower end of the tine itself is relieved by rear chamfering or is of chisel pointformation.

7. Atineofora harrowframeorframesection thereof substantially as herein described with reference to FIGURES 1 and 2 and 4 and 5of the accompanying drawings.