US 2040889 A
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Description (OCR text may contain errors)
E. WHINNEN CORE DRILL May 19, 1936.
Filed May 23, 1935 A ,4 wm.
` Patented May 1.9, n 1936 CORE DRILL Eugene Whinnen, Republic, Mich., assigner to Sullivan Machinery Company, a corporation oi' Massachusetts vApplication May 23, 1933, Serial No. 672,453'
'I'his invention relates to core drills, and more particularly to an improved valve mechanism for controlling the ow of circulating fluid in the core barrels of such drills.
An object of this invention is to provide an improved core drill. Another object is to provide an improved valve mechanism for the core barrel oi.' a core drill. Still another object is to provide an improved core drill having an improved valve mechanism for controlling the iiow of circulating iiuid in the core barrel. Yet another object is to provide an improved valve mechanism of the type of the above character wherein the valve thereof is controlled Iby the l5 pressure of the circulating uid in the core'barrel.
A further object is to providean improved vent valve for the core barrel of a core drill. These and other objects will, however, subsequently more fully appear.
In the accompanying drawing there is shown for purposes of illustration one form and two modifications thereof which the invention may assume in practice.
In this drawing.-
Fig. y1 is a longitudinal section taken through a swivel type core barrel having embodied therein the illustrative form of the improved valve mechanism.
Fig. 2 is a fragmentary view similar to Fig. 1
showing the valve mechanism in a different position.
Fig. 3 is a cross sectional view taken on line 3-3 of Fig. 1.
Fig. 4 is a fragmentary view of a modied form of valve mechanism.
Fig. 5 is a longitudinal sectional view showing the improved valve mechanism incorporated in a rigid type core barrel.
4 In this illustrative construction the improved` valve mechanism is shown incorporated in a core barrel of the double tube type. and in the pre- :Ierred form of the invention the valve mechanism is shown embodied in a swivel type core barrel, while in a modied` form of construction l the improved valve mechanism is shown embodied in a core barrel of the rigid type. It will be evident, however. that the improved valve mechanism may be embodied in core barrels of various other types.
5o In the form of the invention shown in Figs. 1
Threadedly connected to the lower end of the outer tube is an annular core drill bit 6 havingv usualcutting teeth 1 4and a central core passage 3. Rotatably mounted on a ball bearing 3 supported within a chamber I0 formed in the barrel head 3 5 is an inner plug I I held in position onl the bearing by a hollow holding bolt or pin I2, this pin having a head I3 engaging the upper race of the bearing, while threaded on the lower end of the pin is a nut I4 for holding the plug I I in position 10 against the lower race of the bearing. 'I'his bearing is heldin position within thehead by a retaining sleeve I5 threaded within the lower endl of the head. Threadedly connected at I6 to the inner plug II and arranged centrally within and 15 lspaced from the outer barrel is an inner core receivingbarrel or tube Il having its lower end guided within a bore I8 formed in the bit. Mounted within the bit between the lower end oi' the inner tube and a shoulder I9 on the b it is a 20 4core retaining ring 20 having resilient core engaging fingers 2| for engaging andlocking the core cut by the bit within the inner core receiving tube when the core barrel is raised from the drill hole. Passages 22 connect the upper chamber 23 25` within the head 3 with the space between the inner and outer barrels, as shown in Fig. 1, while passages 24,in the bit conduct the fluid from the space between the barrels through the bitA to the bottom of the bit. 30
In the modification shown in Fig. 5, the core barrel is of the rigid type and-in this instance the inner core receiving tube I1 is rigidly threadedly connected at its upperend at 25 to a hollow plug 26 in turn threadedly connected at 21 within the 35l lower end of the barrel head 3. In this form of the invention, the ball bearing 9, holding bolt I2 and bearing retaining'sleeve I5 are omitted, and
the plug 26 engages the threads on the head which are normally engaged by the bearing re- 40 taining sleeve. Otherwise this form oi' the invention is identical to that above described. Now referring to the improved valve mechanism which is shown associated with both types end of a reduced bore 34 on the head. Extend- 5'5 centrally through the valve stem is a iiuid conducting passage 35, while, the wall of the stem is traversed by a iluid passage 36. Surrounding `the stem and formed in the head3 is a chamber valve 40 is omitted, and the passage 35 in-the v valve stern is closed by a threaded plug 4I.
In the use of the improved core barrel, water under pressure is normally circulated' downwardly through -the drill rod I, through the chamber 23 and passages 22, downwardly through the space between the inner and outer barrels and thence downwardly through the bit to wash the cuttings away from therbit, the iluidiiowing upwardly exteriorly of the outer barrel from the drill hole. When it is necessary for the circulating drilling fluid to wash downwardly through the inner core receiving barrel when the core drill is lowered into the drill hole, the, circulating iluid iiows downwardly through the central passage in the valve stem, through the passage in the holding pin I2 into the inner core .receiving tube to Wash the latter clear lof cuttings and debris. After the barrel has been lowered to the bottom of the drill hole, the ball valve is dropped from the ground surface downthrough the drillv rods, and will seat itself on the valve seat 39 on the valve stem to close the passage 35 through the stem. 'I'he circulating fluid then ilows down through the passages 22, through the -space between the tubes and through the passages 24 inthe bit to the bottom of the drill hole, thus preventing, during drilling -of the core, washing of the drilling uid over the core, thereby maintaining the latter in its natural state and free from contamination of the drilling fluid. The pressure of the circulating fluid acting on 'the upper lpressure Aarea of the v alve stem, whenl the ball valve 4l) is'on its seat, causes the valve .stem to be forced downwardly against the compression of the coil spring inner core receiving barrel is thus vented to the exteriorof the outer barrel through the passage in the pin I2, the central passage 35 in the valve stem, chamber 31 and the vent passage 38, lead- 4 ing to the exterior of the barrel, thereby preventing any pressure from building up in the inner tube during drilling of the core and permitting any iiuid in the inner barrel to now therefrom through the ventpassage. When the water pressure is reduced, the valve stem is returned to its upper closed position by the coil spring 32, thereby closing-the vent. Under certain conditions it is desirable to prevent any iiow of the circulating iiuidthrogh the valve stem to the inner core receiving tube, and when this is desired, the plug 4I is threaded within the stem to close oi the s tem passage 35'. Other uses and advantages of the invention will be clearly apparent to'those skilled in the art.
While there is in this application specically described one form and two modifications thereof which the invention may assume in practice, it will be understood that this form and modications of the same are .shown for purposes of illustration and that the invention may be modied and embodied in various other forms without departing from its spirit or the scope of the appended claims.
What I claim as Letters Patent is:
1. In a core drill, a hollow drill rod, a core renew and desire to secure by ceiving barrel carried thereby, means providingV vent passage means for venting the interior of the core barrel to the exterior vof the drill, and valve means for controlling said vent passage means having means for maintaining the same in closed position vduring lowering of the barrel,
and means under the .control of the operator for eiecting opening of said valve means to eiect venting of the interior of the barrel when the drill is in drilling position at the bottom of the drill hole. l
2. In a core drill, a hollow rod through which a drillingl iluid is adapted to ow, a core receiving barrel carried by said drill rod, means associated with said rod and barrel for providingpassage means for conducting drilling iluid from said rod through the interior oisaid barrel to the bottom of the drill during lowering of the barrel into the drill hole,'valve means under'the control of the operator for cutting oi flow of drilling iluid from said rod to the interior of said barrel when the drill is in drilling position at the bottom of the drill hole, and a valve operative when said uid passage means Yis closed by said valve means for venting the interior of said barrel to the exterior of the drill, said vent valve being maintained closed while said uid passage means is open, to prevent flow through the passage to ing closure of the passage means for conducting drilling uid to thelin'terior of the inner barrel so that the drilling fluid at that time iiows only through the space between said barrels, and coperating valve means operative when said passage means for conducting fluid to the inner barrel is closed, for venting the interior of the inner barrel to the exterior of the outer barrel and having means for maintaining the same closed during ilow o! drilling huid through said passage means to the interior o1' the inner barrel.
4. In a core \drl1l, drilling4 iiuid conducting means, an outer barrel, an inner core receiving barrel arranged centrally within and spaced from said outer barrel, means associated with said barrels and iiuid conducting means providing pas#- sage means for conducting drilling iiui'd from said barrel S0 that the drilling fluid at that time OWS only through the space between said barrels, and
cooperating valve means operative when's'aid passage means for conducting uld to the inner barrel is closed, for venting the interior of the inner barrel to the exterior of the outer barrel and having means for maintaining the same. closed during flow of drilling huid through said passage means to the interior of the innery barrel, said 75 latter valve means having means on which the drilling uid is adapted to act for eiecting opening of said vent valve means by the pressure of the drilling iluid.
5. In a core drill, a barrel head, an outer barrel carried by said head, a bit secured to the outer barrel, an inner core receiving barrel arranged centrally within and spaced from the outer barrel, a tubular valve guided in said head, means for supplying circulating iiuid through said head and through said tubular valve to the interior of the core receiving barrel during lowering of the drill into the hole, means for interrupting flow of circulating uid through said tubular valve when the drill is in drilling position at the hole bottoni, means for supplying circulating fluid through said head and through the space between the barrels to the drill bit when iiow of circulating iluid through said tubular valve is interrupted, said tubular valve being opened by the pressure Aof the circulating uid to effect venting of the interior of the core receiving barrel to the exterior of the drill only when flow of circulating iluid through said tubular valve is interrupted.
6. In a core drill, a barrel head, an outer barre carried by said head,'a bit secured to the outer barrel, an inner core receiving barrel arranged centrally within and spaced from the outer bar-` rel, a tubular valve guided in said head, means for supplying circulating fluid through said head and through said tubular valve to the interior of the core receiving barrel during lowering. oi. the drill into the hole, means for interrupting flow of circulating iluid through said tubular valve when the drill is in drilling position at the hole bottom, said flow interrupting means comprising a valve adapted to be dropped by gravity through the drill head into seated position on the tubular j valve to close the passage therethrough, means for supplying circulating iluid through said head and through the space between the barrels to the drill bit only when flow of circulating lluid through said tubular valve is interrupted, said tubular valve being opened when said valve is seated thereon .by the pressure of the circulatingl fluid to effect venting of the interior ofthe core receiving barrel to the exterior of the drill when flow of circulating iluid through said tubular valve is interrupted.