# US 10,865,603 B2 · Core drill apparatus for installation in excavator

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- Number: US 10,865,603 B2
- Document ID: US10865603B2
- Status: Granted
- Kind: B2
- Application number: 15/554,040
- Filed: 2016-02-26
- Published: 2018-02-08
- Granted: 2020-12-15
- Earliest claimed: 2015-02-27
- Applicants: Jae-Mun Park
- Inventors: Jae-Mun Park
- Web page: https://patentgrep.com/patent/US10865603B2

## CPC

- E21B 7/024: {having means for adapting to inclined terrain; having means for stabilizing the vehicle while drilling}
- E02F 5/20: for vertical holes
- E02F 5/30: Auxiliary apparatus, e.g. for thawing, cracking, blowing-up, or other preparatory treatment of the soil
- E21B 7/028: {the drilling apparatus being detachable from the vehicle, e.g. hand portable drills}
- E21B 10/02: Core bits (characterised by wear resisting parts E21B10/48)
- E21B 25/00: Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors (core bits E21B10/02)
- E02F 3/3604: {Devices to connect tools to arms, booms or the like}
- E02F 9/261: {Surveying the work-site to be treated}
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)

## Abstract

The present invention relates to a core drill apparatus which is mounted to a working boom of an excavator so as to drill rock or a concrete structure and, more particularly, to a core drill apparatus for installation in an excavator, which comprises a ring gear and a plurality of elevation cylinders that are connected to and installed in a working support frame mounted to the end of a working boom of an excavator so as to rotate the working support frame, and at the same time, is configured to support the working frame while adjusting the height of the slope using the elevation cylinders when the working frame is supported on an inclined work surface. Therefore, the present invention enables a drilling bit provided in the working support frame to stably drill a structure regardless of the inclination of a work surface to be drilled, and can thus significantly improve the efficiency of a drilling operation.

## Claims

### Claim 1

A core drill apparatus for installation in an excavator, comprising:
a mount having a side portion detachably mounted on an end portion of a boom of the excavator;
a support mounted and fastened to an opposite side portion of the mount, including an upper frame, a lower frame, and supporting frames connecting the upper frame with the lower frame in an upper or lower direction, and formed in a rectangular box structure having, at least, an opened top and an opened bottom;
an elevator including a pair of elevation guide poles passing through the support and an elevation driving motor mounted on a side of the support, wherein the pair of elevation guide poles are provided in parallel with the supporting frames and have an upper portion coupled to the upper frame and a lower portion coupled to the lower fame;
an elevation block ascended or descended along the elevation guide poles by an operation of the elevation driving motor; and
a drilling part including a rotational driving motor mounted in the elevation block and a drill bit coupled with a driving shaft of the rotational driving motor to be rotated by the rotational driving motor, wherein the mount includes a boom coupler formed in an end thereof to connect to the boom of the excavator and a rotational coupler formed in an opposite end thereof to rotatably connect to the support, wherein a plurality of elevating cylinders are coupled to their respective corresponding supporting frames of the support to be ascended or descended along an inclined surface of a work surface for drilling to be brought in tight contact with the work surface, wherein a plurality of hydraulic lines branched from a hydraulic hose are provided on the elevating cylinders, wherein the rotational coupler includes a ring gear enabling the support to rotate and a ring gear driving motor driving the ring gear to rotate forward or backward, and wherein an external spray is connected and provided under the support to jet water to an external work surface where the drill bit performs the drilling, and an internal spray is connected and provided on an upper surface of the drill bit to jet water to an internal work surface where the drill bit performs the drilling.

### Claim 2 (depends on 1)

The core drill apparatus of claim 1, wherein a camera having a lighting device is provided under the support to allow the work surface into which the drill bit performs the drilling to be checked through a monitor screen installed in an operator's cab of the excavator.

### Claim 3 (depends on 1)

The core drill apparatus of claim 1, wherein a point where the plurality of hydraulic lines are branched from the hydraulic hose is positioned closer to any one of the elevating cylinders and further away from another one of the elevating cylinders, and wherein a check valve is included in one of the hydraulic lines which is connected to the other elevating cylinder that is positioned further away from the point.