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Publication numberUS650686 A
Publication typeGrant
Publication dateMay 29, 1900
Filing dateOct 27, 1899
Priority dateOct 27, 1899
Publication numberUS 650686 A, US 650686A, US-A-650686, US650686 A, US650686A
InventorsGeorge Leask
Original AssigneeGeorge Leask
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Core-lifter for diamond drills.
US 650686 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

No. 650,636. Patented mayze, |900. G. LEAsK.


(Application filed Oct. 27, 1899.)

Fig. 2


ccas-Urrea Fon mAMoND calms..

SPECIFICATION forming part of Letters Patent N o, 650,686, dated May 29, 1900. Application iiled October 27, 1899. Serial N0..735,010. (No model.)

To all whom 27tnmy concern.'

Be it known that I, GEORGE LEASK, asubject of the Queen of Great Britain, residing at Nanaimo, in the Province of British Colum-A 5 bia and Dominion of Canada, have invented certain new and useful Improvements in Core- Lifters for Diamond Drills; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable to others skilled inthe art to which it appertain's to make and use the same.

The invention relates to rock-drills, and inore particularly to that class which are provided with a. tubular cutter-head and a core- 15 barrel, in which Vis mounted a core -lifter which is adapted to grasp the core and re# move it when the cutter-head is withdrawn.

To this end the invention consists in certain features of construction and combinao tion of parts which will be hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 is a vertical transverse section of a cutter-head with my improved core lifter in position. is a horizontal section on the broken line c of Fig. 1. Fig. 3 is an enlarged detail section of one of the gripper-pins.

In the drawings the same reference characters indicate the same parts of the invention.

1 denotes the tubular cutter-head, 2 the core-barrel, and 3 the crown, in which the diamond-drill points 4 4 are mounted.

5 denotes an annular shoulder formed on the inside wall of the cutter-head l and on which the valve-casing 6 rests. This casing is provided with two Vertical' ports 7 7 and with corresponding lateral 'ports 8 8, which connect the interior of the case with the vertical ports 7 7. The cutter-head 2 is provided with two longitudinal ports 8' 8', which extend from the ports 7 7 tothe valve-chambers .9 9, formed in the lower end of the cutterhead.

10 10 denote a series of, valve-ports formed in the bottom of the valve-casing, and 12 a ventilator form of disk-valve axially mounted on the stub-bolt 13 and adapted to open or close or partially close the valve-ports 10, as desired.

14 designa-tes a tubular valve having a. sliding engagement with the valve-casing and held iu a'closcd position by the spiral spring 15 to cut 0E communication with the valveports 8 8, and the upper end of this tubular` valve 14 is formedl with a conical valve-seat 16 'to receive the bail-valve 17.

82 8 denote lateral ports formed in the' valve-casing 6 above the valve 14, and they communicate with longitudinal ports 83 83, which extend through the cutter-head, corebarrel, and crown. v

18 1S denote diagonal guide-passages extending downwardly from the valve-chambers 9 9 and opening on the interior of the core-barrel 2 to receive the gri pper-pins 19 19.

20 denotes a valve mounted in the valvechamber, and its stem is encompassed by a spiral spring 21 to retain the valve in a normally-closed position.

The hnver end of the valve-stem 20' has a ball-and-socket connection with the head of the grippenpins and by this means holds the gripper-pins 19 clear of the core. When, however, the water-pressure is applied to the. valves 20, the gripper-pins are forced into pla-ce for gripping the core.

In operating the device the ball-valve 17 is,

removed from the cutter-head and the latter lowered and rotated to perform the boring, and at the same time a current of water is supplied to the drill by means 'of the valveports 10 10. When the boring operation has progressed a sufficient distance,the ball-valve 17 is dropped down in the cutter-head and it rests on the tubular valve 14, closing its axial passage, and the pressure of the column of water overcomes the tension of the spiral spring 15, forcing the valve 14 downward to open the ports 8 8 and permit the water to pass down the ports 7 7, thence downward through the longitudinal ports S 8 and into the valve-chambers 9 9, thereby opening the valves 2O 2O and forcing the gripping-pins 19 '19 downwardly and inwardly, so as to encompass and grasp the core, as shown in Fig. 1. The cutter-head is now withdrawn, the upward movement causing the gripping-.pins to be drawn still farther out of their guide-passages and wedge said core in the corebarrel,

w, so that it will be removed with the cutterhead.

In boring in soft coal orother soft material the water passing through the valve 12 passes down inside t-hc core-barrel between thc core- IOO barrel and the core. This water will wash away and disintegrate the core in such away as to render it valueless for determining the nature and exact thickness of the coal passed through, and to overcome this objection when coal or other soft rock is struck and it is desirable to preserve the core the rods'are at once hoisted and the disk-valve '12 closed. This shuts the water oi the core-barrel and causes it to pass down the longitudinal -ports El3 83 directly to the crown.

It will of course be understood that various changes in the form, proportion, and the minor details of construction may be resorted to Without departing from the principle or sacrificing any of the advantages of this invention.

Having thus described the invention, what is claimed, and desired to be secured by Letters Patent, is

The cutter-head provided with longitudinal ports and valve-chainbers,the core-barrel provided with diagonal guide-passages communicatin g with said valve-chambers, the valvecasing mounted in the cutter-head and formed with the lateral ports and the longitudinal ports, the tubular spring-actuated valve and the independent ball-valve, spring-actuated valves mounted in the valve-chambers, and the gripper-pins having a sliding engagement with the core-barrel, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3163241 *Dec 20, 1961Dec 29, 1964Shell Oil CoCore sample taking
US4603749 *Aug 27, 1984Aug 5, 1986Norton Christensen, Inc.Apparatus for downward displacement of an inner tube within a coring barrel
US7000966 *Sep 24, 2002Feb 21, 2006General Motors CorporationPick-and-place tool
Cooperative ClassificationE21B25/00