# US 11,078,790 B2 · Electric drilling and bolting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,790 B2 - Document ID: US11078790B2 - Status: Granted - Kind: B2 - Application number: 15/642,839 - Filed: 2017-07-06 - Published: 2018-01-11 - Granted: 2021-08-03 - Earliest claimed: 2016-07-06 - Assignees: Joy Global Underground Mining LLC - Applicants: Joy Global Underground Mining LLC - Inventors: Robert Holdsworth; Brad Neilson; Peter Hanna - Web page: https://patentgrep.com/patent/US11078790B2 ## CPC - E21D 20/003: {Machines for drilling anchor holes and setting anchor bolts} - E21B 7/027: {Drills for drilling shallow holes, e.g. for taking soil samples or for drilling postholes} - E21D: SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS (soil-conditioning or soil-stabilising materials C09K17/00; drilling or cutting machines for mining or quarrying E21C; safety devices, transport, rescue, ventilation or drainage E21F) - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A drilling and bolting device for driving a drill element into a rock surface includes a frame, a drive unit supported for movement relative to the frame, and an actuator for moving the drive unit relative to the frame. The drive unit includes a motor and a chuck for engaging the drill element. The chuck is driven by the motor. In some aspects, the actuator includes a magnet exerting a magnetic force on the block to provide magnetic coupling between the actuator and a block supporting the motor. In some aspects, the actuator is positioned at least partially within an elongated member of the frame. In some aspects, the drive unit includes a switched reluctance motor including a stator and a rotor supported for rotation relative to the stator, and the rotor is directly coupled to the chuck. ## Claims ### Claim 1 A drilling and bolting device comprising: a frame; a drive unit supported for movement relative to the frame, the drive unit including a block, a motor supported on the block, and a chuck for receiving a drill element, the chuck driven by the motor; and an actuator for moving the drive unit relative to the frame, the actuator including a magnet exerting a magnetic force on the block to provide magnetic coupling between the actuator and the block, wherein the block moves in response to movement of the magnet. ### Claim 2 (depends on 1) The drilling and bolting device of claim 1, wherein the frame is a feed frame supported for movement along an extendable base frame. ### Claim 3 (depends on 1) The drilling and bolting device of claim 1, wherein the frame is a base frame, the drilling and bolting device further comprising a feed frame supported for movement relative to the base frame along a feed axis, wherein operation of the actuator moves the feed frame relative to the base frame, wherein the drive unit is directly supported on the feed frame. ### Claim 4 (depends on 1) The drilling and bolting device of claim 1, wherein the actuator further includes an elongated threaded shaft and the magnet is threadably coupled to the threaded shaft, the threaded shaft oriented parallel to a feed axis, rotation of the threaded shaft causing the magnet to move along the threaded shaft, the movement of the magnet causing corresponding movement of the block parallel to the feed axis. ### Claim 5 (depends on 4) The drilling and bolting device of claim 4, wherein the threaded shaft is driven by an electric motor. ### Claim 6 (depends on 4) The drilling and bolting device of claim 4, wherein the magnet is eccentrically mounted with respect to the threaded shaft, a center of the magnet being offset from the threaded shaft. ### Claim 7 (depends on 1) The drilling and bolting device of claim 1, wherein the magnet is movable in a direction parallel to a feed axis, the magnet having a non-circular cross-section. ### Claim 8 (depends on 1) The drilling and bolting device of claim 1, wherein the magnet is one of an electromagnet and a permanent magnet. ### Claim 9 (depends on 1) The drilling and bolting device of claim 1, wherein the magnet is a first magnet, wherein the block further includes a second magnet extending at least partially along a perimeter of the first magnet. ### Claim 10 A drilling and bolting device comprising: a frame; a drive unit supported for movement relative to the frame, the drive unit including a block, a motor supported on the block, and a chuck for receiving a drill element, the chuck driven by the motor, wherein the motor is a switched reluctance motor positioned at least partially within the block; and an actuator for moving the drive unit relative to the frame, the actuator including a magnet exerting a magnetic force on the block to provide magnetic coupling between the actuator and the block. ### Claim 11 (depends on 10) The drilling and bolting device of claim 10, wherein the frame is a feed frame supported for movement along an extendable base frame. ### Claim 12 (depends on 10) The drilling and bolting device of claim 10, wherein the frame is a base frame, the drilling and bolting device further comprising a feed frame supported for movement relative to the base frame along a feed axis, wherein operation of the actuator moves the feed frame relative to the base frame, wherein the drive unit is directly supported on the feed frame. ### Claim 13 (depends on 10) The drilling and bolting device of claim 10, wherein the actuator further includes an elongated threaded shaft and the magnet is threadably coupled to the threaded shaft, the threaded shaft oriented parallel to a feed axis, rotation of the threaded shaft causing the magnet to move along the threaded shaft, the movement of the magnet causing corresponding movement of the block parallel to the feed axis. ### Claim 14 (depends on 13) The drilling and bolting device of claim 13, wherein the threaded shaft is driven by an electric motor. ### Claim 15 (depends on 13) The drilling and bolting device of claim 13, wherein the magnet is eccentrically mounted with respect to the threaded shaft, a center of the magnet being offset from the threaded shaft. ### Claim 16 (depends on 10) The drilling and bolting device of claim 10, wherein the magnet is movable in a direction parallel to a feed axis, the magnet having a non-circular cross-section. ### Claim 17 (depends on 10) The drilling and bolting device of claim 10, wherein the magnet is one of an electromagnet and a permanent magnet. ### Claim 18 (depends on 10) The drilling and bolting device of claim 10, wherein the magnet is a first magnet, wherein the block further includes a second magnet extending at least partially along a perimeter of the first magnet.