Subsoil-breaking implements

Claim 2

An implement as claimed in Claim 1, in which the tine is of asymmetrical chisel shape in side elevation, its sharp leading end being at or near the level of the bottom surface of the tine and the upper surface of the tapered portion of the tine being upwardly and rearwardly inclined from the leading end towards the cutting edge of the blade.

Claim 3

An implement as claimed in Claim 1 or Claim 2, in which the tine comprises a forwardly projecting portion of a generallyhorizontal bar which extends along the foot of the blade.

Claim 4

An implement as claimed in Claim 3, in which the bar is of greater width than the width of the lower end portion of the blade adjacent its foot.

Claim 5

An implement as claimed in Claim 3 or Claim 4 in which the bar is straight and is of generally circular cross-section which is uniform at least along that part of its length which lies between the leading and trailing edges of the blade.

Claim 6

An implement as claimed in any one of Claims 3 to 5 in which the bar also projects rearwardly behind the trailing edge of the blade.

Claim 7

An implement as claimed in Claim 6 in which the cross-section of the bar increases rearwardly behind the trailing edge of the blade.

Claim 8

An implement as claimed in any one of Claims 3 to 7 in which the bar is detachably secured to the lower end of the blade.

Claim 9

An implement as claimed in Claim 8 in which the portion of the length of the bar lying behind the sharp leading end of the tine forms a ridge which extends along the foot of the blade and projects from the surface of the blade on at least one side thereof.

Claim 10

An implement as claimed in any one of the preceding claims, in which the profile of the blade, as viewed from one side, tapers from its upper end towards its foot, the leading edge of the blade being forwardly and downwardly inclined with respect to the direction of travel, and the trailing edge of the blade being forwardly and downwardly inclined less steeply than the leading edge.

Claim 11

An implement as claimed in Claim 10 in which both the leading and the trailing edges of the blade are straight.

Claim 12

An implement as claimed in any one of the preceding claims, in which over the operative portion of the blade its lower slanting side is relieved behind a line adjacent to but spaced rearwardly from the leading edge.

Claim 13

An implement as claimed in Claim 12 in which the said relieved portion of the lower slanting side of the blade extends rearwardly as far as the trailing edge.

Claim 14

An implement as claimed in any one of Claims 1 to 13, whose blade is provided with a duct positioned within a downwardlyextending groove formed in the trailing edge of the blade, the duct having an inlet at its upper end and having one or more discharge openings below its upper end, in combination with means connected to the said inlet for delivering fluid material under pressure through the duct for discharge through the discharge opening or openings.

Claim 15

An implement as claimed in any one of the preceding claims, whose blade is formed with a duct extending downwardly from its upper end within the thickness of the blade, the duct having an inlet at its upper end and communicating with one or more discharge openings in one or each of the sides and/or to discharge at the trailing edge of the blade, in combination with means connected to the said inlet for delivering a liquid or gaseous material under pressure, for example compressed air with entrained powder, through the duct for such discharge.

Claim 16

A subsoil-breaking implement substantially as specifically described herein with reference to Figures 1 to 3 of the accompanying drawings.

Claim 17

A subsoil-breaking implement substantially as specifically described herein with reference to Figures 1 to 3 of the accompanying drawings.

Claim 18

A subsoil-breaking implement substantially as specifically described herein with reference to Figures 1, 2 and 4 of the accompanying drawings.

Claim 19

A subsoil-breaking implement substantially as specifically described herein with reference to Figures 1, 2 and 4 of the accompanying drawings.

Claim 20

A subsoil-breaking implement substantially as specifically described herein with reference to Figures 7 and 8, or to Figures 9 and 10, or to Figure 11, or to Figures 12 to 15, or to Figures 17 to 19 of the accompanying drawings.

Claim 21

A subsoil-breaking implement substantially as specifically described herein with reference to Figures 7 and 8, or to Figures 9 and 10, or to Figure 11, or to Figures 12 to 15, or to Figures 17 to 19 of the accompanying drawings.