Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent
1986-11-13
1988-09-20
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
175417, E21B 1038
Patent
active
047718340
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a National Phase Application corresponding to PCT/DE86/00097 filed Mar. 8, 1986 and based, in turn, upon a German National Application P3510048.6 of Mar. 20, 1985.
FIELD OF THE INVENTION
The invention relates to a percussion drill bit for grinding rock and stone.
BACKGROUND OF THE INVENTION
Percussion drill bits for rock perforators may have a frontal face covered by a plurality of hard-metal studs, several such studs being arranged in a group. The resulting groups maybe at a distance from each other at least in circumferential direction and separated from each other by channels for the circulation medium. Further, the bit may be provided with at least one axial channel opening into the channels and located approximately centrally within the frontal face, serving as an outlet for the circulation medium.
Such a drill bit is known for instance from German open application DE OS No. 27 33 300.
Indeed, in the case of this already-known two-part drill bit, cutting inserts, for instance in the shape of hard-metal studs are provided in groups, whereby the groups are separated from each other through circulation-medium channels running radially, respectively in given cases, slightly curved in the direction of rotation.
The studs are indeed arranged in a multiple setting on an island, protruding with respect to the circulation-medium channels so that larger lumps of detritus can get stuck between the studs. This results in a relatively long drilling time for corresponding advances, because these lumps must first be comminuted before they can be evacuated by the circulation-medium through the circulation-medium channels. The circulation-medium channels do not serve for the exhaust gas evacuation. Neither do they help in the evacuation of the detritus, this evacuation being performed solely by the exhaust gas. Furthermore, the studs arranged in this manner can be reground only with difficulty, since the neighboring studs mutually impede their regrinding.
For the mounting of such drill bits to rock perforators it is common, in the case of the so-called sinker drills, to introduce a slotted shaft in a holding member. Thereby the drive operates counterclockwise. Alternatively it is also possible, in the case of surface drills, to provide the shaft with an inner threading, which can then be threaded to a nipple. This embodiment turns clockwise.
The individual arrangement of studs protruding from the main body of the drill bit is known from the German open application No. 26 33 779. This arrangement facilitates the regrinding of the studs, but obstructs the evacuation of the detritus. Moreover, larger lumps of detritus can continue to get stuck between the studs.
OBJECT OF THE INVENTION
The object of the invention is to provide a percussion drill bit of the afore-described kind, wherein, on the one hand, it is relatively easy to regrind the studs and, on the other hand, the sticking of larger lumps of detritus between the studs is largely prevented and the evacuation of the detritus is promoted.
SUMMARY OF THE INVENTION
In order to attain the object, the invention provides that each of the groups consist of one row of studs, arranged on protruding drilling facets.
With to this type of construction, it is possible, on the one hand, to regrind the studs of each stud row relatively easily, whereby each of the stud surfaces which are essential for the comminuting of the rock is easily accessible. On the other hand, larger lumps of detritus can practically not get stuck between the studs. On the contrary, these lumps can be immediately deflected radially outwardly and evacuated through the circulation-medium channels. The detritus is transported in the free spaces between the drilling facets and evacuated due to the action of the exhaust gases of the rock perforator, particularly of the drill hammer.
It is particularly advantageous when the drilling facets run contrary to the direction of rotation of the drill bit, inclined with respect to the radius.
Thi
REFERENCES:
patent: 2484365 (1949-10-01), Wilsher
patent: 3521716 (1970-07-01), Fisher
patent: 3583504 (1971-06-01), Aalund
patent: 3951220 (1976-04-01), Phillips, Jr.
patent: 4096917 (1978-06-01), Harris
patent: 4202421 (1980-05-01), Pinck
patent: 4203496 (1980-05-01), Baker, III
patent: 4471845 (1984-09-01), Jurgens
Mining Magazine, Nov. 1974, p. 383.
Dubno Herbert
Melius Terry L.
Novosad Stephen J.
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