Tool driving or impacting – Impacting devices – With means for rotating tool
Patent
1975-09-25
1978-01-31
Purser, Ernest R.
Tool driving or impacting
Impacting devices
With means for rotating tool
74577M, E21C 328
Patent
active
040710939
ABSTRACT:
An air percussion boring machine comprising a percussion means, a front head with a boring tool holder, a rear head with a hole mouth washer and a boring tool rotation mechanism synchronized with the percussion means. The boring tool rotation mechanism is provided with a stator with blades secured on its internal surface at an equal distance from each other. Installed inside the stator is a rotor with blades whose number is equal to the number of stator blades. Arranged in the rotor cavity is a sleeve wherein pawls are hinged, the pawls having means for pressing the pawls to a ratchet coupled to a tail piece of the boring tool for rotating it. The pawls in each pair are coupled to each other and are used to rotate the ratchet clockwise and counterclockwise. The means for pressing the pawls to the ratchet is made in the form of air power cylinders with pistons contacting the pawls. A compressed air source is in communication with the air power cylinders of the pawls for rotating the ratchet in one direction and is set in mesh with the ratchet, while the air power cylinders of the other pawls are in communication with the atmosphere, thus dropping them out of meshing with the ratchet.
REFERENCES:
patent: 2043352 (1936-06-01), Hulshizer
patent: 2457969 (1949-01-01), Anderson
patent: 2512232 (1950-06-01), Haut
patent: 3433329 (1969-03-01), Koudelka
patent: 3802518 (1974-04-01), Albert
Osipovsky Lev Fedorovich
Shipov Stanislav Valeryanovich
Zubarev Anatoly Ivanovich
Pate III William F.
Purser Ernest R.
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