Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting
Reexamination Certificate
1999-03-12
2001-03-20
Lillis, Eileen D. (Department: 3673)
Boring or penetrating the earth
With above-ground means for handling drilling fluid or cutting
C175S209000, C175S213000, C055S300000, C055S304000
Reexamination Certificate
active
06202765
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
A device for sucking off drillings during the drilling of boreholes, comprising a suction fan and a filter as well as an opening closeable by a lid for emptying the drillings reception space preceding the filter.
2. Prior Art
When drilling boreholes for the purpose of setting roof bolts in order to stabilize the rock it is known to scour the drillings forming either by aid of liquids, such as water, under pressure or to effect removal via suction by hauling the drillings through the drill rod without scouring agent so as to get them into a suction device via a suction channel. Known suction devices of that type comprise a drillings reception chamber or reception space, into which the suction channel opens. To that reception space is connected a suction fan with a filter being interposed. The purified air, as a rule, is blown out in the direction towards the mine face. After termination of the drilling phase, both the driving motor and the suction fan may be set out of operation, wherein the drillings collected in the reception space may be discharged by opening the lid. In doing so, the drillings usually get on the floor.
Those known suction fan arrangements involve the drawback that thorough cleaning of the collection vessel in most cases is feasible only to an insufficient degree and that, above all, the filters are not cleaned. With the filters being rendered more and more impure, the suction performance will decrease, which might affect the performance of the drilling device.
SUMMARY OF THE INVENTION
The invention aims at providing a device of the initially defined kind by which it is feasible in a simple manner to effectively clean the filter of the suction device, thereby avoiding a decrease of the suction performance. Furthermore, the invention aims to further develop a device of the initially defined kind so as to enable enhanced clearance and enhanced discharging of the drillings from the reception space or reception chamber.
To solve this object, the invention, departing from a device of the initially defined kind, essentially consists in that the lid is connected with a filter vibrating means. Such a vibrating means may be of a relatively simple configuration, it merely being required to appropriately couple the vibrating means with the lid and, in particular, with the pivotal movement of the lid. Thus, after having stopped the suction motor and opened the lid, vibration and hence cleaning of the filter are effected simultaneously, wherein the material thrown off the filter surfaces by vibration can be discharged through the closeable opening opened via the lid.
In a particularly simple manner, the configuration according to the invention is devised such that the lid is designed as a bottom flap and to the lid is hinged a vibrating rod or ratchet which cooperates with a ratchet or vibrating rod engaging at the filter. Such a simple mechanical device in which, for instance, a toothed rack may be connected with the lid as the vibrating rod at every opening of the bottom flap will cause a vibrating movement of the filter as a function of the engagement of the ratchet in the vibrating rod, thereby throwing off material adhering to the filter surfaces.
In order to be able to reliably exert said vibrating movement on any standard filters without modification of the filters, the configuration advantageously is devised such that a comb-like engagement part for the pockets of a pocket filter is connected with at least one spring band reaching into the reception space and that the spring band carries at least one projection or conical pin cooperating with a vibrating rod formed by a toothed rack, and that the vibrating rod is articulately hinged to the pivotable lid. Such a comb-like configuration of the engagement part may be brought into engagement with standard pocket filters as are common in suction devices and, in this manner, the vibrating movement is safely transmitted onto the filter without requiring modifications at the filter itself. The vibrating movement is imparted by means of a spring band each in ratched-like engagement with a vibrating rod or toothed rack, said vibrating movement being induced by the projections reaching into the teeth of the toothed rack or vibrating rod and causing the spring band to be bent and the bent spring band to accordingly snap back upon entry into the consecutive tooth space.
In order to ensure simple coupling of the vibrating rod with the lid, the configuration advantageously is devised such that the vibrating rod is hinged to the lid at a distance from the pivot axis of the lid and is pivotably guided within the reception space.
In order to further enhance the discharging of drillings from the reception chamber or reception space and be able to safely remove deposits from the walls of the reception space, the configuration advantageously is devised such that at least one scraper is connected with the lid for scraping material off bottoms or side walls of the reception space, particularly during closing of the lid. The scraper may be designed in the manner of a rake and may be pressed, in particular resiliently, against the wall of the reception space and, in particular, a bottom wall of the same.
According to a preferred further development of the device according to the invention, the scraper itself is articulately connected with the pivotable lid so as to be able to follow, in particular inclinedly arranged, side walls of the reception space while maintaining a scraping contact during opening of the lid.
Fixation of the comb-like reception part for the pocket filter advantageously is realized in a manner that the comblike engagement part via at least one spring band is fixed to a housing including a guide part for the vibrating rod.
An appropriate negative pressure prevails within the reception space during the suction operation, and in order to be able to ensure safe sucking off the lid must be closed in an accordingly tight manner during the suction operation. In order to enable the opening of the lid and hence the discharging of the drillings, the configuration advantageously is devised such that the lid is connected with a pivot drive capable of being locked in its closing position with the fan motor running.
REFERENCES:
patent: 2453951 (1948-11-01), Vedder
patent: 2781104 (1957-02-01), Fischer
patent: 2975847 (1961-03-01), Feucht
patent: 3155613 (1964-11-01), Felix et al.
patent: 3792569 (1974-02-01), Carlson et al.
patent: 3910360 (1975-10-01), Sundstrom
patent: 4328014 (1982-05-01), Burgoon et al.
patent: 4708723 (1987-11-01), Howeth
patent: 5320188 (1994-06-01), England
patent: 63-158113 (1986-12-01), None
Brandl Erich
Schaffer Kurt
Schnedl Karl
Lillis Eileen D.
Pillsbury & Winthrop LLP
Singh Sunil
Tamrock Voest-Alpine Bergtechnik Gesellschaft m.b.H.
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