Stone working – Sawing – Endless
Patent
1993-06-15
1994-11-22
Rachuba, M.
Stone working
Sawing
Endless
125 22, 30381, B28D 108
Patent
active
053659147
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
The invention relates to a dismantling tool suitable, for example, for the demolishing or, respectively, tearing down of walls made of stone, concrete, and the like, or of wooden structures.
STATE OF THE ART
The necessity can arise, primarily when carrying out structural alterations and renovation of buildings, that wall breakthroughs must be provided, or inside installations must be removed, in a controlled fashion. Over-all, a great variety of tasks present themselves in the building industry, such as, for example, the milling of grooves, the provision of recesses for cable boxes, the cutting of steel, or the creation of core drillings. Such work has been performed heretofore usually by means of pick hammers and blowtorches and diamond milling cutters with water cooling. However, many of these devices are directed toward quite specific applications. All milling processes involve purely a cutting operation with a correspondingly extensive heat production.
REPRESENTATION OF THE INVENTION
It is an object of the invention to indicate an all-around tool usable for a great variety of different tasks, the term milling being understood to mean a combination of cutting and shattering.
In an all-around tool according to this invention, several cutter rings are forward-driven on a round guide yoke wherein the guide yoke exhibits at least two helical grooves running along its outside in opposite winding directions, and wherein consecutive cutter rings engage with a guide element into the oppositely oriented grooves in such a way that consecutive cutter rings contrarotate when driven forward along the guide yoke. The cutter rings thus are arranged along the guide yoke in the manner of a string of beads. If they are moved forwards, they execute a rotating movement tending to correspondingly cut open the solid item to be dismantled.
Preferably, each cutter ring has a target point for the engagement of a drive element. The cutter rings follow one another directly, as in the case of a string of beads. They contact one another so that, upon the forward driving of an individual cutter ring, all others are likewise driven forward. The cutter rings thus are independent elements driven from the outside.
The drive element preferably is a gear wheel engaging the cutter rings at a suitable place. For this purpose, the cutter rings are preferably constricted at their ends so that a kind of recess results between neighboring cutter rings into which the gear wheel can engage. In place of a gear wheel, it is also possible, in principle, to utilize a chain drive wherein driving cams inserted in the drive chain engage into the recesses of the cutter rings provided for this purpose.
The cutter rings proper are not entirely closed but rather are open at a point so that they can be guided past a holder of the guide yoke.
The guide yoke is an inherently closed rod. It is fixed advantageously to be exchangeable in a drive unit. The yoke can consist of two composable guide rods or can be welded into a one-piece ring.
The guide yoke exhibits a longitudinal rib on which it can be retained in the drive unit. The grooves extend, in the region of the longitudinal rib, in parallel to the latter so that the open cutter rings can be guided past the longitudinal rib. Preferably, the grooves and the longitudinal rib extend devoid of any rotation.
Since a considerable pressure is exerted on the cutter ring during the driving operation on account of the gear wheel, it is advantageous to provide a ball bearing on a side of the guide yoke in opposition to the driving gear wheel. This ball bearing is a kind of abutment preventing the cutter ring from being urged too vigorously onto the guide yoke and consequently the sliding friction from increasing too greatly.
The cutter rings can also be driven by means of a type of linear motor instead of by means of a gear or chain drive. In case of such a drive, stator windings are provided in the guide yoke. The cutter rings are fashioned as rotors and are turned and thereby driven forward by th
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patent: 1374525 (1921-04-01), Pugh
patent: 1392503 (1921-10-01), Jackson
patent: 3509704 (1970-05-01), Henzman
patent: 3587679 (1971-06-01), Conte
patent: 3886926 (1975-06-01), Hall
patent: 4031878 (1977-06-01), Hall
Rachuba M.
Reserwa AG
Vitesse Etablissement
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