Breaker apparatus

Claim 2

Breaker apparatus for breaking surface crusts and the like, comprising a base adapted to be mounted on a traction unit, an elongate passive, non-pneumatic breaker bar unit comprising an elongated, fixedly mounted breaker bar having a breaker point at a lower end thereof, linkage swingably mounting the breaker bar unit on the base for substantially vertical movement, said linkage maintaining the breaker bar unit in a generally downwardly-extending attitude and comprising vertically spaced upper and lower links pivotally connected at opposite ends to the base and the breaker bar unit, a single hydraulic cylinder unit having a lower end connected to the base and an upper end connected to the upper link, and operating means for selectively supplying pressure fluid to said cylinder unit alternatively to swing the upper link up and down and consequently to raise the lower said breaker bar unit to cause said point thereof to strike surface crusts and the like therebeneath and, together with said single hydraulic cylinder unit, constituting the sole means for the said raising and lowering of said breaker bar unit.

Claim 3

Breaker apparatus as claimed in claim 1 including pivot means for swingably mounting said base on a traction unit, and power means connected to the base operable to swing said base and consequently said breaker bar laterally into different positions with respect to the base.

Claim 4

Breaker apparatus as claimed in claim 1 in which said upper link is arch shaped with one end pivotally connected to an upper end of the breaker bar unit and an opposite end pivotally connected to the base, said cylinder unit being connected to the upper link substantially midway between the ends thereof.

Claim 5

Breaker apparatus as claimed in claim 3 in which said lower link has an end pivotally connected to and base and an opposite end pivotally connected to the breaker bar unit at a point spaced from said one end of the upper link.

Claim 6

Breaker apparatus as claimed in claim 1 in which said breaker bar unit comprises a downwardly-extending beam, and a breaker bar mounted on and extending longitudinally of and below a lower end of said beam, said linkage being pivotally connected to the beam.

Claim 7

Breaker apparatus as claimed in claim 5 including bracing means fixedly mounted on the beam and engaging an upper end of the breaker bar to brace the latter.

Claim 8

Breaker apparatus for breaking surface crusts and the like, comprising a vertical shaft mountable for rotation on a traction unit, a vertical mounting base secured to the shaft to rotate therewith, power means connected to the shaft operable to rotate said shaft, and elongated breaker unit having at a lower end a breaker point, substantially parallel upper and lower links having vertically spaced inner ends pivotally connected to the base and vertically spaced outer ends pivotally connected to the breaker bar unit, said upper and lower links swingably mounting the breaker bar unit on the base for substantially vertical movement and maintaining said bar unit in a generally downwardly-extending attitude, a single hydraulic cylinder unit having a lower end connected to the base and an upper end connected to the upper link, and operating means for selectively supplying pressure fluid to said cylinder unit alternatively to swing the upper link up and down and consequently to raise and lower said breaker bar unit to cause said point thereof to strike surface crusts and the like therebeneath and, together with said single hydraulic cylinder, constituting the sole means for the said raising the lowering of said breaker bar unit.

Claim 9

Breaker apparatus for breaking surface crusts and the like, comprising a vertical shaft mountable for rotation on a traction unit, a vertical mounting base secured to the shaft to rotate therewith, power means connected to the shaft operable to rotate said shaft, and elongated breaker unit having at a lower end a breaker point, substantially parallel upper and lower links having vertically spaced inner ends pivotally connected to the base and vertically spaced outer ends pivotally connected to the breaker bar unit, said upper and lower links swingably mounting the breaker bar unit on the base for substantially vertical movement and maintaining said bar unit in a generally downwardly-extending attitude, a single hydraulic cylinder unit having a lower end connected to the base and an upper end connected to the upper link, and operating means for selectively supplying pressure fluid to said cylinder unit alternatively to swing the upper link up and down and consequently to raise and lower said breaker bar unit to cause said point thereof to strike surface crusts and the like therebeneath and, together with said single hydraulic cylinder, constituting the sole means for the said raising the lowering of said breaker bar unit.

Claim 10

Breaker apparatus as claimed in claim 7 in which said upper link is substantially arch shaped, and said cylinder unit is connected to the upper link substantially midway between the ends thereof.

Claim 11

Breaker apparatus as claimed in claim 7 in which said breaker bar unit comprises a downwardly-extending beam, and a breaker bar mounted on and extending longitudinally of and below a lower end of said beam, said linkage being pivotally connected to the beam.

Claim 12

Breaker apparatus as claimed in claim 9 including bracing means fixedly mounted on the beam and engaging an upper end of the breaker bar to brace the latter.