DE2228115A1 - SOCKET WITH A WIRE CORE AND SPRING SNAP FINGERS - Google Patents

Description

Dresser Industrial Products, Ltd. 409 Granville, Vancouver 2, British Columbia, Canada

"Bush with a wire rope core and resilient locking fingers ¹¹

The invention relates to the technique of core drilling in general and to a system with a sleeve with a wire rope core in particular.

It is common practice to take samples or cores of the formation to obtain geological information. The cores are made with the use of a rotating hollow drill cable or drill rod a core bit at the lower end and a core sleeve in the rotatable hollow drill cable next to the core bit. To eliminate the need to remove all of the drill cord to maintain the core, a retractable one is a retractable one Core box has been developed. This sleeve is blocked when working with the core chisel until the Core sample is taken. At that time, a wireline searcher is used for removal the core sleeve is applied by pulling it out of the drill cable.

In general, the core drilling operations can be divided into upward drilling and downward drilling. This is a common drilling process, drilling is done from the horizontal downwards and when drilling upwards

Jerlin

Telephone: 888 6037/8882382 Wireword: Invention Berlin

Bank account: W. Meissner, Berliner Bank AG, Depka36 Beriin-Haleneee, Kurf Urstendamm 130, contact no. 95 7f β

Postal checking account:

W. Msieiner, Beriin West 132 32

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drilling takes place from the horizontal upwards, like drilling up into the formations over a pit shaft. Core drilling often results in formations that Contain water or other liquids. Therefore, core drilling can also be characterized as wet or dry be. It is desirable to have a single barrel with a wire rope core for up and down drilling and in wet or dry holes. Such a plant must be extremely versatile in order to be able to fluctuate under Conditions to be able to perform the necessary functions. When drilling down in a dry hole the core box must be able to be lowered by a wire rope and blocked in the position for core formation, * have means for receiving the drilled core, coming free from the core layer and then the tubular Can pull up drilling cables. When drilling down into a wet hole, the core box must have a facility to form "a liquid seal between the drill cable and the drill core sleeve body in order to prevent liquid from flowing past the core box so that it is pumped into its working position can. Once the core box is in this position, it must be blocked in its position and so must the liquid pass the core box while drilling. After drilling the core, the core box must be released and without the entire column of liquid being brought back to the surface from the drilling cable above the core sleeve must be pulled out. When drilling upwards, the system must be fitted with the wire rope core sleeve perform the functions necessary when drilling down into wet holes and also prevent the fluid from entering flows downward out of the drill cable due to its gravity ο

Perhaps the only most important requirement of a core box system is that it be reliable. The attachment

Always have to work properly, even though they are tough too Is exposed to environmental conditions of the ear. The attachment is intended to give a signal to the drill worker when the core sleeve is properly latched into the core to indicate that he can start drilling. Once the drill container has been filled, the core sleeve should give a signal to the drill worker indicating that the core box must be sought. The core box should notch, without the need for hammering and can easily be withdrawn from the borehole.

There is no known installation with a core box with a wire rope which is suitable for both upward and downward drilling and can be used in wet and dry holes. The previous wire rope core box systems contain many moving parts and do not have the desired reliability. Although some well-known plants give a signal indicating a snap, the signal is not entirely reliable. The latch elements the known systems result from errors in the correct latching into the working position and when correct sharing difficulties. These difficulties can result in core drilling if the core sleeve is in the working position is not latched or is stuck in the latched position, whereby the entire drill cable must be removed in order to receive the core sample «The previous wire rope core sleeve systems would open the landing protrusion, which creates a shock that could damage the landing protrusion and the core sleeve, hit hard "

In the American patent 2, o46,798 a Method and apparatus for core drilling shown. The core box described is used with a rotary drilling rig and is used for introduction into the borehole and for removal from the borehole through the rotating drilling

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cable. One attached to the bottom of the drill cable Core chisel makes a ring-shaped cut, rl he one leaves the middle core untouched for the core holder. The facility includes a facility through which the drill worker receives a signal on the surface when the core holder is filled with a core or when to one; Point a blockage between the ends of the core holder has occurred, which prevents the entry of additional material into the core holder.

In the American patent 3,12o, 282 a Wire rope core liner shown which can be hydraulically advanced to the chisel end of the drill cable. These System contains a core box inner tube for holding a core, a rod wedge catcher for retracting the core box inner tube from the chisel end of the drill rod and a release device for the wedge catcher for notching the core box inner tube, so that the wedge catcher can be withdrawn separately from the core box inner tube. The core box inner tube is provided with a device that supplies the fluid for its hydraulic propulsion can be in a position in which it passes through the core box inner tube and during drilling around the Drill bit circulates.

The invention relates to a system with a wire rope core bushing, 'which drill both for upwards and downwards and can be used in dry and wet holes. The core box engages and disengages and engages reliable signal indicating that the core box is in the position ready to receive a core. The system contains a drill cable with a drill bit for drilling a core sample, one for transport through the drill cable serving core sleeve and a search device for placing the core sleeve in their working position and to withdraw the core box

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from the drill cable can be used. The core box is in the receiving position for the core by at least a "flexible and resilient latch finger is blocked, one end of which is rigidly connected to the core sleeve and the other end is connected to the drill cable in one An actuating device that can move your core box is used to lock the Position of the pawl fingers by deforming and tensioning the IC left spring body. There is a adjustable sealing element, through which the core sleeve is provided with a larger diameter at this point will. A passage passes through the core sleeve and is closed by moving the actuating device can be. The seal on the core sleeve provides cushioning to reduce impact when the Core sleeve on the protrusion on the drill cable.

It is therefore the object of the invention to provide a system with a wire rope core sleeve suitable for both upward and downward drilling and in dry and can be used in wet holes with the wire rope core liner latching in the core forming position and notches from this. The core box is also intended to be in its working position while a core is being picked up Remain engaged and disengaged and withdrawn from the drill cable even if a pawl finger is broken should be. The system should also be a reliable one Generate signal that indicates latching «

The system with the wire rope core liner should not allow a core to form until the core liner is in the core receiving position properly latched, and produce a reliable signal that is blocking the core indicates. It should also have few moving parts and be stronger and more durable than previous systems no.

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The wire rope core bushing according to the invention should be relatively simple and less expensive to manufacture than previous core bushings, and be easy to operate and maintain, it should be corrosion-resistant and work well in the drilling environment.

The core box should have a Sinpump seal and Can absorb shocks that occur when placing the sleeve on the Aufset ^ projection on the drill cable.

The objects and advantages of the invention are set out in Connection with the drawings described »In these is:

Figure 1 is a view of an installation of a wire rope core liner with part of the drill cable with a Core formation chisel, a core sleeve in the drill cable for receiving a core sample and a search device to withdraw the core sleeve from the drill cable;

FIG. 2 shows the upper part of the core box according to the invention, in which the latch fingers are in the working position for transporting the core sleeve through the drill cable;

FIG. 3 shows the middle part of the core sleeve according to FIG. 2;

FIG. 4 shows the lower part of the core sleeve according to FIGS. 2 and 3;

Figure 5 shows the upper part of the core box according to Figure 2, wherein the pawl fingers are in the pawl seat on the drill cable; and

FIG. 6 shows a latch finger and the actuating device of another exemplary embodiment of a pin bushing according to the invention.

The core sleeve 1o is in Figure 1 in a rotary drill illustrated, which is made up of a series of sections of a

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hollow drill pipe is made, which are connected to each other and so result in a drill cable. For example, the drill cable 12 can be made from a series of drill pipes screwed together at the ends of the cut-offs. A core bit 14 is attached to the lower end of the drill cable 12 and has an annular cutting surface 16 and an opening in the middle. The cutting surface 16 may be of a known type, ZoB. be a metal matrix with inserted diamonds. As the drill cable 12 and core bit 14 are rotated, the cutting surface serves to crush the formation 20 and form a borehole 22. The central opening 18 in the core bit 14 enables a core to be built up while drilling. To obtain geological information from the formation 2o, a section of the core 24 is withdrawn from the borehole using the installation with the wire rope core sleeve according to the invention.

Drilling a core can be done from the horizontal either up or down and be done at any incline. For example, core drilling by drilling down into the formations above a pit shaft. The (not shown) Rotary drilling rig is located in front of the formations through which drilling is to be done. The rotary drilling rig provides both rotational and compressive forces to the drill cable and can be any of several known Be rotary drills. Most drilling operations require a circulating fluid system to cool the bit and for rinsing out the cuttings and stone debris from the borehole. This liquid circulation system can contain a hydraulic pump (not shown), which is connected to the drilling cable 12. The hydraulic pump lets the drilling fluid through the interior -of the drilling cable 12 on the surface 16 of the drill bit -. ■. · ■■ - ■ -8-

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and up into the .Ring between the borehole wall and the Circulate outside of the drill cable.

In order to obtain a sample of the formation 2o, the core sleeve 1o must be in the drill cable 12 next to the core cutting bit 14 be arranged. When drilling a core in a dry hole, the core sleeve can 1o due to its gravity be lowered into their working position, and with wet holes, the core box 1o is used the drilling fluid is pumped into its working position. The core sleeve 1o is attached to the end of the chisel of the drill cable 12 brought until it reaches a placement projection 26 on the drilling cable. A complementary contact point 23 on the core sleeve 1o touches the contact projection 26 on the drill cable and thus prevents further downward movement and hangs the core sleeve in the correct position Reception of the core 24-. After the core box 1o the When the core position has been reached, it is firmly latched into place by pawls 32 and 32, which are attached to KMnkensitzen 34 and 36 attack the drill cable 12. When the desired core sample is received in the core sleeve 1o, it must come out of the borehole 32 to be withdrawn. This is done by a search device 38 'which is transported through the drilling cable 12 until it reaches the core box 1o. A gripping device 4o on the search device 38 engages a mandrel 42 on the core box 1o, the pawls 3o and 32 come out of the pawl seats 34 and 36 free and the Core box 1o and the locator 38 are from the drill cable withdrawn by a cable 44 connected to the locator 38 and a (not shown) cable is connected.

The core sleeve 1o contains a sealing rubber 46 which gives the core sleeve a larger diameter and forms a liquid seal between the drill cable 12 and the core sleeve 1o. Tile core box can then go through

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the fluid pressure of the drill can be pumped into its working position. Is the core sleeve latched and firmly connected to the drilling cable, the drilling fluid must be able to flow past the core sleeve 1o, to cool the core bit 14 and flush the drill cuttings and rubble from the borehole.

Since the upper part 47 of the core sleeve 1o with the drill cable is firmly connected, it rotates when the drill cable is turned. To prevent unnecessary destruction of the The drill sample container 48 must not rotate. Therefore, a drill swivel 5 ° is provided, which the container 48 and the upper part 47 of the core sleeve 1o connects with each other.

Since the searcher 38 is generally in the same V / eise like the core box 1o is pumped into its working position the search device 38 contains a rubber seal 46 on the core sleeve similar sealing element 52, which like the rubber seal 46 by the Liquid column in the drill cable is flowed around when the Device 38 and core sleeve 1o withdrawn from drill cable 12 will. Otherwise the entire column of fluid in the drill cable would have to be withdrawn before the core sample would receive. Through the device 38 and the core sleeve 1o, the pulling force of the cable 44 fluid channels open.

The upper part of the core sleeve 54. according to Figure 2, the corresponding of the invention is constructed as a combination of FIGS. 2, 3 and 4. When laying on top of each other of FIGS. 2, 3 and 4, with FIG. 2 at the top and FIG. 4 at the bottom, is the complete core box shown. The core sleeve 54 fits easily into. hollow Rotary drilling cable 56 having a pawl and landing tab portion 58, which corresponds to the other sections of the

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Drill cable is similar but has an inner protrusion 60 and two pawl seats 62 and 64.

The upper part of the core sleeve 54 consists of a cylindrical tubular housing 66, which is slightly smaller in diameter than the interior of the drill cable 56. At the Housing 56 are two pawl fingers with four mounting pins 72 68 and 70 rigidly attached, which are made of a flexible and resilient material such as spring steel. They are shown in their non-flexed position in which the core sleeve is transported through the drill cable can. In the housing 66 there is an actuating device 74, which in it from a first position in of the fingers 68 and 50 in cutouts in the side of the Snap device 74 into place, slide into a second position can, in which the pingers are printed outwardly by the device 74 in a tensioned position.

The upper .End 76 of the actuator 7 ^ is a solid cylinder which fits into the tubular housing 66 and closes its end. The upper end 76 of the device 74 slides freely in the housing 66, but prevents fluid in the drill cable 56 from entering the housing. The lower portion 7C of the device 74 has a rectangular cross-section, whereby liquid can flow through the entire lower part of the core box. In the side of the housing 66 are two holes 80 and 82 through which fluid from the drill cable 56 can freely flow into the core sleeve 54 when they are not blocked by a valve 84. The valve 84 is attached to the actuator 74 and moves it, whereby the holes 80 and 82 are blocked or released. In d _a rgestellten position, the actuator 74 and the valve 84 block the fluid passage. However, they can either be moved up or down to reveal holes 80 and 82 *

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The angled ends of the pawl fingers 68 and Jo and the hooked ends of the device 74- work together to ensure that the fingers 68 and 70 are withdrawn even if they should be broken.

On the outside of the housing 66 there is an annular sealing rubber 86 which gives the core sleeve 54 a larger diameter and ^{creates a liquid seal with the T} .7and of the drill cable. The extension of the sealing rubber 86 can be adjusted by a ring 88 under the sealing ring 86 and a screwed sealing nut 9o above the seal 86. The sealing rubber is squeezed between the sealing nut 9o and the ring 88 and the expansion can be adjusted by the sealing nut 86. The ring 88 forms a contact projection on the core sleeve 54- imd. is coupled to the rubber seal 86 and the sealing nut 9o and thus provides cushioning when the core sleeve 54- touches the projection 6o on the drill cable «,

At the upper part of the core sleeve, two elongated extensions 92 of the housing 66 are connected to the spring and spindle housing 94 (FIG. 3). In the housing 94- _r is an elongated stem 96 which slides in the housing 94-. A holder 98 is attached to the spindle 96 at a point within the housing 94-. A second holder 100 is fastened with the spindle 96 somewhat below the holder 98 and outside the housing 94-. This allows the spindle to move up and down within given limits - which are given by the holders 98 and 100. In the housing 94- there is a spring 10, which is surrounded by the housing and is pressed into its lowest position. The length of the spindle 96 can be adjusted by a locking nut 1o4 so that it engages the lower, threaded part 1o6 of the spindle 96.

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With the lower part 1o6 of the spindle 96 is in bearings 11ο and 112 a core sample container 1o8 rotatably held, which can thus rotate freely against the upper part of the core sleeve. An upward pressure on the core box 1o8 creates an upward movement of the spindle, which acts against the force of the spring 1o2. Am hole 114-in The upper end of the container 1o8 allows liquid to flow out of this when the container is filled with a sample is filled.

The core sample container 1o8 is shown next to the coring chisel 116 in FIG. A stabilizing ring 118 holds the container 1o8 firmly in position to receive the core while drilling. At the bottom of the container 1o8 there is a core lifter 12o that is used to hold the sample is used in container 1o8 during sampling.

The mode of operation of an embodiment of a core box according to the invention is illustrated with the aid of FIGS. 3j 4- and 5 described, the core sleeve 54- im Drill cable 56 is located. The core box 54- is inserted into the Rotary drilling cable and in 'the receiving position next to the core bit brought. The sealing nut 9o is loosened in dry holes in order to prevent the expansion of the sealing rubber 86 to reduce. The core box 54- is through the search device lowered into its working position, which engages the long upper part of the actuating device 74-. When the core sleeve 54- has reached its working position, the search device releases the tip of the mandrel and is withdrawn from the drill cable. In wet holes, the sealing nut 9o is compressed, whereby they the Sealing rubber 86 compresses and increases the tension and thus a fluid seal between the tubular housing 66 and the interior of the drill cable 56 results. The core box 54- can now be in its working position

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be pumped. The setting mark! T of the elongation of the Sealing rubbers 86 are used to compensate for wear on the rubber. In addition, the rubber 86 serves as a cushion to absorb shocks when the core sleeve 54 is on your lead touches down. Because the washer on the housing 66 is not attached, the impact when touching the Aufsetzvorsprunges 66 from the ring 88 on the Transfer rubber seal 86.

When the core sleeve 54 is pumped into its working position, the actuating device 74 is brought into the position shown in FIG 82 blocks. When the device 74 is in this position, the core bushing 54 blocks the drilling cable completely and can be pumped into its working position. If the core sleeve 54 has reached the inner projection 6o on the drill cable, the washer ring 88 strikes the projection and prevents further downward movement. Since the core sleeve 54 completely blocks the flow of fluid through the drill cable 56, further pumping causes the fluid pressure to build up in the drill cable 56. This indicates to the drill operator that the core sleeve is adjacent to the core bit. The pressure continues to rise until there is sufficient force at the exposed points of the upper end 76 of the device 7 ^ to press the device 7 ^ downwards and to exceed the resistance of the latch fingers 62 and 64. If the required pressure is reached, the force brings to the device 74, the latch fingers 68 and 7 ⁿ outward in the pawl seats 62 and 64. The fluid pressure, ie, the force on the means 74 for moving the latch fingers 68 and 7o is a function Her Inclination of the surface of the device 74 ₃ which engages the pawl fingers, and its material thickness.

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The system with the core box according to the invention supplies a pressure signal _s which indicates the latching of the core box. If the pawl fingers 68 and 7o do not latch properly, the pressure rises above the level of the pressure signal and the drill worker now knows that the core sleeve is incorrectly latched. If the pawl fingers 58 and 7o are correctly latched, the actuating device moves 5 with the open holes 80 and 82 and the fluid in the drill cable 56 can circulate through the core sleeve during drilling Invention is in the unlatched position.

With the core sleeve 1o8 blocked in the core holder next to the core chisel 116, the core can be removed. The drill cable 56 is rotated and the core begins to build through the central opening of the core bit 116 and into the core box 108. The liquid in the container 108 is pushed upward and enters the drill cable 56 through the hole 114. When container 108 is completely filled with a core, or when a core becomes blocked, an upward force is applied to container 10S. The upward force is transmitted via the spindle 96 to the lower part of the actuating device 7 ^. The device 74 is moved upward until the valve 84 is in a position in which the holes 8o and 82 are blocked. This prevents liquid from flowing past the core sleeve and transmitting a signal for the drill worker. The drill worker then knows that it is time to locate the core box. As the Farrap.-tion conditions seek to change, the upward pressure on the container "08" changes during the core removal and a downward movement has to be made on the spindle 86

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be created. This is done by a spring 1o2, which acts against the spindle 86. To compensate for fluctuations in the formation conditions, the spindle 1o2 be replaced by a spring of certain force to counter the resistance to the upward movement of the spindle, which the corresponds to the formation used for core formation, to increase or decrease.

The core cytus 54- is tracked down by the search device, which is lowered until it engages the long upper part of the actuator 74-. Then will on the device 7 ** · via a cable and the search device put an upward force. The device 74 moves up until the latch fingers 68 and 7o are in their relaxed position in the cutouts in the device 74- snap into place. Because the elastic latch fingers 68 and 7o are in the tensioned state when they are in the latch seats 62 and 64- try to snap back into their relaxed position. Should one or both latch fingers 68 and 7 ° be broken, like this they are secured by the hook-shaped lower end 78 of the device 74- withdrawn when device 74 · continues is moved upwards. To avoid withdrawing the entire column of fluid in the drill cable between the core sleeve and the drill a fluid channel must be opened through the core sleeve 54- to To allow liquid to flow through the housing 66. "This is done by the actuator 74- that moves further upwards until the valve is over the holes 8o and 82, thus exposing the holes and provides fluid passage through the core sleeve 54-. The device 74- continues to move up until the hook-shaped lower end 78 is the angled Ends of the pawl fingers 68 and 7o touched. Then one will Force through fingers 68 and 7 ° on the entire core box £ 4- transferred, -3it then withdrawn from the drill cable can.

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A latch finger 122 of another embodiment of a core box according to the invention, which is shown in Figure 6-8, is rigidly attached to the core box body.
In its relaxed position, the lower end 134 of the finger 122 fits into a cutout in the actuating device 124 and the core sleeve can be transported through the tubular cable. If the core is in
the receiving position for a core, a downward force is applied to the device 124. This force is caused by the pressure that thaws on the drilling fluid in wet holes, or by gravity in
generated in a dry hole. The force builds up until it is sufficient to overcome the position of the latch finger 122. The necessary force is a function of the inclined surface η 132 and 14o and the material thickness of the pawl finger 122. The finger 122 then swings into a pawl seat 13o in the drill cable 132.: The upper surface 1J6 dec jirgers 1 ° 2 sits firmly ir : Klir.k ^ r zitz 13o and the core can now be removed. When the core sleeve is disengaged, the actuating device 124 is moved upwards urd the lower end 134 of the finger snaps into the seat 13o and into the cutout in the device 124. Since the lower end 134 of the finger 122 swings outward and away from the seat 13o
the possibility that the core sleeve is stuck in the pawl position is very, very small. But should the finger
122 break or otherwise be prevented from unlatching, it is withdrawn from the pawl seat 13o by the hook-shaped lower end 142, which grips the beveled lower end 134- of the finer 122.
In addition, the hooked lower end 142 ensures that the latch finger 122 is firmly held in the retracted position when the core sleeve is withdrawn from the drill cable.

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Claims (16)

BI-71-7 Dresser Industrial Products, Ltd., Vancouver 2, Br. Columbia claims σ 1. Core box from a core box body with which a Core sample container is connected, characterized in that at least one flexible latch finger (68, 70) provided with resilient properties isj ;, der is rigidly connected to the upper body part of the core sleeve (10), and that an actuating device (74) changes the position of part of the pawl and thereby flexes the flexible pawl finger (30, 32, 68, 70) and tense. 2. core box according to claim 1, characterized in that the actuating device (74) is an element which can move to the core box body (10, 54) and has a surface that the finger (30, 32, 68, 70) touches and thereby changes the position of the pawl part. 3 · core box according to claim 2, characterized in that the core box body (10, 54) has a part with a has a larger diameter and a fluid passage is provided through the core sleeve through the part carries liquid with a larger diameter, and where the actuating device (74) contains a valve (84), which closes the liquid passage. 4. core box according to claim 3 _t, characterized in that the part with the larger diameter is a sealing rubber (86) which is located on the core box body (88) and an adjustable sealing nut (90). - 18 2Ü9881 / 0478 5. Core box η i ... rc ^ ruch ^z l-, thereby z ^e "- ^zi that the Ke rnprobenbehälter iit (1o8) connected to the core box body (1o, 54) by bearings lie the Kernbüchsenkör ^ he ζ :: ιό Kerc. ^ yr --benbehlilber rotate lascen uv I ■ ;; o the stock a "means for ^ evver ^ n ^ r ^ ef'ti- {Tunrereinricht'mg (74) have the valve (84 ·)
closes. 6. Plant for obtaining a core sample with a core box according to claim 1 with a drill rod extending into the borehole, a core bit on the drill rod, a pawl seat on the drill rod and a search device for transporting this through the drill rod and with a core sleeve according to one of the preceding Claims, characterized by a sealing element (52) on the core sleeve body (1o, 54) which forms a liquid seal between the core sleeve and the drill rod (12, 56), a fluid passage through the core sleeve that allows fluid to flow through the core sleeve; and by means on the actuating device (74) for blocking and releasing the liquid passage. 7. core box according to claim 2, characterized in that the actuating device (74-) is an element which has an actuating surface that contacts the pawl finger (3o, 32; 68j 7o), which then touches its pawl part into the pawl seat (34, 36; 62, 64 ·) in a first operating stall and the pawl part of the finger out of the seat in a second operating position brings. 8. core box according to claim 7 »characterized in that the actuating element (74) has a pressure surface, 2Ü9881 / CU78 BATH the inside of the boring bar (12, 56) above the core box (Ic, 54-} faces and Ίen pressure on the liquid causes the actuating member to the first 3etätiger _Se ttings. 9. core box according to claim 8, characterized in that Zc-2 the device for blocking and releasing the fluid passage contains a valve (84) which blocks the fluid passage in the first actuator position and releases it in the second actuator position _o 10. ICernbüch & e according to claim 9j, characterized in that that the actuator element (74 ·) has a device for touching and withdrawing the pawl portion of the finger Qo, 32; 68, 7o) from the latch seat (34, 36; 62, 64) owns in a third actuator position. 11. core box according to claim 1o, characterized in that the actuating device has a connection for the Search device (38) possesses, through iie search device, the actuating device in the third working position and brings the valve (38) out of the liquid passage <, 12. Core box according to claim 11, characterized in that the sealing element is an elastic sealing element (86) which is located between a movable locking ring (88) and an adjustable sealing nut (9o). 13 · core box according to claim 12, characterized in that, that the core sample container (1oC) is connected to the core box (1o, 54) by bearings that hold the core box in Turn in relation to the core sample container (1o8) » 14. core box according to claim 13, characterized in that ί 1 / O U 7 8 - 2ο - that between the core sample container (1o8) and the actuating device (74 ·) a device is provided that connects the valve (£ 4-) with. the actuator connects in a position in which the liquid passage is blocked. 15 · Core tube according to one of the preceding claims, characterized in that a fluid circulation system is connected to the drill rod (12, 56) and allows drilling fluid to run through the drill rod and at least one fluid passage passes through the tubular core sleeve (1ο, 5 ² O, that the responsive actuator means to the pressure of the drilling fluid and causes the pawl portion of at least one finger into the latch seat when ^ it exceeds pressure of the drilling fluid ert a given 7. ^r, and that ias valve (84-) is connected to the actuating means to the fluid passageway to open or close. 16. Core box according to claim 15 _5, characterized in that the Actuatorelemer.t of the actuating device (7 ^ -) can move with a pressure surface exposed to the drilling fluid and an actuating surface touches the Illir, -kenfinger and brings its pawl part into the pawl seat. 17 · core box according to claim 15, characterized in that that the valve is connected to the actuating device and opens the passage when the Klinkenteii des Fingers into the latch seat. Dipl.-Ing. P. t. Meissne ( Patent attorney 2U988 1/0478