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US 4,850,752 AGranted
Tool for stone-blowing
AssigneeKango Wolf Power Tools Limited
InventorAndrew S. Carey-Yard
Life of this patent
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AssigneeKango Wolf Power Tools Limited
InventorAndrew S. Carey-Yard
Estimating the term…
There is provided a tool for stone-blowing comprising upper and lower mating parts (13, 14), the upper part being tubular and the lower part being mainly of channel section and having its lower end closed off by a transverse wall. The wall is shaped internally (19) to direct stones laterally and is shaped externally (22) to facilitate driving the tool into the ground adjacent a sleeper (33) so that the open front of the channel communicates with a void (34) beneath the sleeper. On the upper part is a hopper (11) for stones and below the hopper opening into the upper part is a compressed air inlet (26) and a port (24). In use, compressed air is directed at the rear wall and entrains air through the port (24) and the hopper (11) thereby propelling the stones down the tool and through the open front of the channel and into the void (34).
A tool for use in stone-blowing comprising a first portion of generally tubular section, a second portion of generally channel section in alignment with and forming a continuation of said first portion and providing an open front, the end of said first portion remote from said second portion constituting an inlet for stones and the free end of said second portion being closed off by a transverse wall shaped externally to facilitate driving the tool into the ground in an upstanding attitude for aligning at least a section of the open front of the second portion with an underground void and shaped internally to deflect laterally through said open front stones moving along the second portion, a compressed air inlet opening into the first portion at a position below the stone inlet and directed away from the stone inlet, and a port located at a position below the stone inlet, the arrangement being such that, in use of the tool, the flow of compressed air entrains air through the stone inlet and through said port.
A tool for use in stone-blowing comprising a first portion of generally tubular section, a second portion of generally channel section in alignment with and forming a continuation of said first portion and providing an open front, the end of said first portion remote from said second portion constituting an inlet for stones and the free end of said second portion being closed off by a transverse walls shaped externally to facilitate driving the tool into the ground in an upstanding attitude for aligning at least a section of the open front of the second portion with an underground void and shaped internally to deflect laterally through said open front stones moving along the second portion, and a compressed air inlet opening into the first portion at a position below the stone inlet and directed away from the stone inlet so as, in use, to entrain air through the stone inlet, said air inlet incorporating a nozzle.
A tool for use in stone-blowing comprising a first portion of generally tubular section, a second portion of generally channel section in alignment with and forming a continuation of said first portion and providing and open front, the end of said first portion remote from said second portion constituting an inlet for stones and the free end of said second portion being closed off by a transverse wall shaped externally to facilitate driving the tool into the ground in an upstanding attitude for aligning at least a section of the open front of the second portion with an underground void and shaped internally to deflect laterally through said open front stones moving along the second portion, and a compressed air inlet opening into the first portion at a position below the stone inlet and directed towards the face of the channel portion opposite said open front so that the angle of entry of the compressed air through said air inlet is such that this air rebounds from said face of the channel and intersects the general plane of the open front of the channel at a point near the free end of the second portion.
A tool for use in stone-blowing comprising a first portion of generally tubular section, a second portion of generally channel section in alignment with and forming a continuation of said first portion and providing an open front, the end of said first portion remote from said second portion constituting an inlet for stones and the free end of said second portion being closed off by a transverse wall shaped externally to facilitate driving the tool into the ground in an upstanding attitude for aligning at least a section of the open front of the second portion with an underground void and shaped internally to deflect laterally through said open front stones moving along the second portion, and a compressed air inlet opening into the first portion at a position below the stone inlet, said tool being constituted by upper and lower mating parts, in the upper of which is provided the stone inlet and a restriction to constitute a barrier for stopping stone which are larger than a predetermined size.
Dependencies are inferred from the claim text.