# US 8,770,108 B2 · Coupling device for explosives > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,108 B2 - Document ID: US8770108B2 - Status: Granted - Kind: B2 - Application number: 13/530,327 - Filed: 2012-06-22 - Published: 2012-12-27 - Granted: 2014-07-08 - Earliest claimed: 2011-06-22 - Assignees: Industry Foundation of Chonnam National University - Applicants: Hyung Sik Yang; Jeong Gyu Kim; Hyong Doo Jang; Won Beom Kim - Inventors: Hyung Sik Yang; Jeong Gyu Kim; Hyong Doo Jang; Won Beom Kim - Web page: https://patentgrep.com/patent/US8770108B2 ## CPC - F42B 3/02: adapted to be united into assemblies - F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D) ## Abstract A coupling device which is configured such that respective explosives for blasting work are coupled to front and rear sections thereof. The coupling device includes cylindrical bodies, one of the bodies being movable away from or close to another one of the bodies, a partition provided inside a predetermined one of the bodies to divide an inner space of the predetermined body, and an expandable support section provided between the bodies to connect the bodies to each other. The expandable support section forms a cylindrical shape together with the bodies when one body is moved away from the other body and is radially expanded when one body is moved close to the other body. The explosives can be easily inserted into a blasting hole and be positioned in the center of the blasting hole, thereby increasing the efficiency of blasting work. ## Claims ### Claim 1 A coupling device which is configured such that respective explosives for blasting work are coupled to front and rear sections thereof, the coupling device comprising: cylindrical bodies, one of the bodies being movable away from or close to another one of the bodies; a partition provided inside a predetermined one of the bodies, the partition dividing an inner space of the predetermined body; and an expandable support section provided between the bodies to connect the bodies to each other, wherein the expandable support section forms a cylindrical shape together with the bodies when one of the bodies is moved away from the other one of the bodies and is radially expanded when one of the bodies is moved close to the other one of the bodies. ### Claim 2 (depends on 1) The coupling device of claim 1, wherein the expandable support section comprises a plurality of support pieces, which are arranged in an outer circumferential direction of the bodies and are cut in a lengthwise direction of the bodies, wherein each of the support pieces is symmetrical such that the support piece is foldable in a middle portion thereof. ### Claim 3 (depends on 2) The coupling device of claim 2, wherein the expandable support section further comprises anti-folding projections provided between the support pieces and the bodies. ### Claim 4 (depends on 3) The coupling device of claim 3, wherein the anti-folding projections are also formed on an inner middle portion of the support pieces at which the support pieces are to be folded. ### Claim 5 (depends on 4) The coupling device of claim 4, further comprising a holding protrusion extending from the partition, the holding protrusion provided inside the predetermined body to fix a corresponding one of the explosives, which is inserted into and coupled to the predetermined body. ### Claim 6 (depends on 3) The coupling device of claim 3, further comprising a holding protrusion extending from the partition, the holding protrusion provided inside the predetermined body to fix a corresponding one of the explosives, which is inserted into and coupled to the predetermined body. ### Claim 7 (depends on 2) The coupling device of claim 2, wherein the expandable support section further comprises a wall-fixing tap, which protrudes out from a folding portion of the support pieces. ### Claim 8 (depends on 7) The coupling device of claim 7, wherein the wall-fixing tap has a contact surface that can come into face-to-face contact with an inner wall of a blasting hole in a state in which the support pieces are folded. ### Claim 9 (depends on 2) The coupling device of claim 2, further comprising a holding protrusion extending from the partition, the holding protrusion provided inside the predetermined body to fix a corresponding one of the explosives, which is inserted into and coupled to the predetermined body. ### Claim 10 (depends on 1) The coupling device of claim 1, wherein an air vent is formed in one of the bodies that has sections divided by the partition, the air vent being formed in at least one of the sections divided by the partition, such that air can be exhausted from inside the bodies when the explosives are inserted into and coupled to the bodies. ### Claim 11 (depends on 10) The coupling device of claim 10, further comprising a holding protrusion extending from the partition, the holding protrusion provided inside the predetermined body to fix a corresponding one of the explosives, which is inserted into and coupled to the predetermined body. ### Claim 12 (depends on 1) The coupling device of claim 1, wherein each of the bodies has an engagement recess in an inner surface thereof, the engagement recess fixing a corresponding one of the explosives, which is inserted into and coupled to the body, from outside. ### Claim 13 (depends on 12) The coupling device of claim 12, further comprising a holding protrusion extending from the partition, the holding protrusion provided inside the predetermined body to fix a corresponding one of the explosives, which is inserted into and coupled to the predetermined body. ### Claim 14 (depends on 1) The coupling device of claim 1, further comprising a holding protrusion extending from the partition, the holding protrusion provided inside the predetermined body to fix a corresponding one of the explosives, which is inserted into and coupled to the predetermined body. ### Claim 15 (depends on 14) The coupling device of claim 14, wherein the holding protrusion has a through-hole formed therein. ### Claim 16 (depends on 1) The coupling device of claim 1, wherein each of the bodies has a plurality of grooves longitudinally formed in an inner wall thereof.