# US 2014/0154020 A1 · Coolant supply device and electric drill unit provided with coolant supply device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0154020 A1 - Document ID: US20140154020A1 - Status: Published application - Kind: A1 - Application number: 14/122,650 - Filed: 2012-05-21 - Published: 2014-06-05 - Earliest claimed: 2011-05-30 - Assignees: Kabushiki Kaisha Miyanaga - Applicants: Kabushiki Kaisha Miyanaga - Inventors: Masaaki Miyanaga - Web page: https://patentgrep.com/patent/US20140154020A1 ## CPC - B28D 7/02: for removing or laying dust, e.g. by spraying liquids; for cooling work - B23B 45/003: {Attachments} - B23B 51/06: Drills with lubricating or cooling equipment {(B23B51/042 takes precedence)} - B28D 1/041: {with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles} - B28D 1/14: by boring or drilling (rotary drilling machines B23B; {tools for drilling machines B23B51/00}; portabe percussive machines B25D; {rotary drilling machines for mining or quarrying E21B3/00}) - B23B 2226/75: Stone, rock or concrete - B23B 2231/24: Cooling or lubrication means - Y10T 408/44: with means to apply transient, fluent medium to work or product - Y10T 408/455: Conducting channel extending to end of Tool - B28D: WORKING STONE OR STONE-LIKE MATERIALS - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A coolant supply device attached to an electric drilling tool is configured to supply a coolant to a drilling portion at a distal end of a drill. The coolant supply device includes: a first flange member and a second flange member provided axially on a rotating shaft, the rotating shaft sharing a same axis with the drill, the first flange member being positioned at the drill side, the second flange member being positioned such that the second flange member is more distant from the drill than the first flange member; space formed between the flange members, into which a coolant is injected; a coolant supply passage formed between the first flange member and the drill and guiding the coolant in the space to the drill; and a coolant push-out mechanism configured to push the coolant out of the space toward the coolant supply passage. ## Claims ### Claim 1 A coolant supply device attached to an electric drilling tool and configured to supply a coolant to a drilling portion at a distal end of a drill when the drill performs drilling, the coolant supply device comprising: a first flange member and a second flange member provided on a rotating shaft, the rotating shaft sharing a same axis with the drill, the first flange member being positioned at the drill side, the second flange member being positioned such that the second flange member is more distant from the drill than the first flange member along the rotating shaft; space formed between the flange members, into which a coolant is injected; a coolant supply passage formed between the first flange member and the drill, the coolant supply passage guiding the coolant in the space to the drill; and a coolant push-out mechanism configured to push the coolant out of the space toward the coolant supply passage. ### Claim 2 (depends on 1) The coolant supply device according to claim 1, further comprising: a supply valve disposed on the coolant supply passage and configured to switch a state of the coolant between a state of being allowed to flow from the space to the drill and a state of being blocked from flowing from the space to the drill, wherein the supply valve includes: a valve seat with an opening; a valve element positioned more outside than the valve seat in a radial direction of the rotating shaft, the valve element including a closely contacting portion configured to block the opening, the valve element being movable in the radial direction of the rotating shaft; and a spring member configured to bias the valve element toward the valve seat from a radially outer side in the radial direction of the rotating shaft, the spring member exerting such spring force as to allow the closely contacting portion to block the opening when the rotating shaft is in a non-rotating state and allow the closely contacting portion to be away from the opening when the rotating shaft is in a rotating state. ### Claim 3 (depends on 1) The coolant supply device according to claim 1, wherein a valve element accommodating hole, which accommodates the valve element in such a manner as to allow the valve element to move in the radial direction of the rotating shaft, is formed in the first flange member, the first flange member is configured to be rotatable with respect to the rotating shaft, a plurality of communication holes, which have different respective passage sectional areas and which come into communication with the valve element accommodating hole, are radially formed in the rotating shaft in the radial direction of the rotating shaft, and each of the communication holes is selectable in such a manner that, by rotating the first flange member prior to performing drilling, an intended one of the communication holes is caused to face the valve element accommodating hole, such that the coolant is supplied to the drilling portion at a suitable flow rate for the drilling. ### Claim 4 (depends on 3) The coolant supply device according to claim 3, wherein a rotation positioning mechanism is provided between the first flange member and the rotating shaft, and the rotation positioning mechanism maintains a state where a selected one of the plurality of communication holes faces the valve element accommodating hole. ### Claim 5 (depends on 1) The coolant supply device according to claim 1, wherein the second flange member is configured to be lifted and lowered along the rotating shaft, and the coolant push-out mechanism includes a biasing device configured to bias the second flange member toward the first flange member to contract a volume of the space between the flange members. ### Claim 6 (depends on 5) The coolant supply device according to claim 5, wherein a locking portion is formed in the rotating shaft, the locking portion corresponding to a height position of the second flange member when the coolant is injected into the space, and the second flange member is provided with a stopper member configured to be removably locked to the locking portion. ### Claim 7 (depends on 1) The coolant supply device according to claim 1, wherein movement of the first flange member and the second flange member along the rotating shaft is restricted, the coolant push-out mechanism includes: a plurality of weights arranged around the rotating shaft and movable in a radial direction of the rotating shaft; and a diaphragm disposed outside the plurality of weights and expandable from a contraction state, the space into which the coolant is injected is formed outside the diaphragm between the flange members, and the diaphragm expands when the weights move outwardly in the radial direction of the rotating shaft due to rotation of the rotating shaft, such that the coolant in the space is pushed out of the space toward the coolant supply passage. ### Claim 8 (depends on 1) The coolant supply device according to claim 1, wherein movement of the first flange member and the second flange member along the rotating shaft is restricted, the coolant push-out mechanism includes an air hole formed within the rotating shaft to extend in an up-down direction, the air hole having an upper end which is open at an upper end surface of the rotating shaft and having a lower end which is open at a circumferential surface of the rotating shaft, the space into which the coolant is injected is formed outside the rotating shaft between the flange members, and compressed air is supplied from the upper end of the air hole toward the lower end of the air hole, such that the coolant in the space is pushed by pressure of the air, and the coolant in the space is pushed out of the space toward the coolant supply passage. ### Claim 9 (depends on 1) An electric drill unit comprising: the coolant supply device according to claim 1; and an electric drilling tool to which the coolant supply device is attached.