# US 10,480,898 B2 · Low-shock separation device

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- Number: US 10,480,898 B2
- Document ID: US10480898B2
- Status: Granted
- Kind: B2
- Application number: 15/893,823
- Filed: 2018-02-12
- Published: 2019-08-15
- Granted: 2019-11-19
- Earliest claimed: 2018-02-12
- Assignees: Agency for Defense Development
- Applicants: Agency for Defense Development
- Inventors: Dong-Jin Kim; Zaeill Kim; Nam-Choon Kim; Yeung-Jo Lee; Jeong-Min Cha
- Web page: https://patentgrep.com/patent/US10480898B2

## CPC

- F41F 3/052: Means for securing the rocket in the launching apparatus
- F16B 31/00: Screwed connections specially modified in view of tensile load; Break-bolts (shape of thread {F16B33/02; in couplings F16D9/00})
- F16B 31/005: {Breakbolts loosening due to the action of an explosive charge}
- F42B 3/006: {Explosive bolts; Explosive actuators (explosive valves F16K13/06; explosive cutting B23D15/145; explosive switches H01H39/00; pyrotechnical actuators F15B15/19)}
- F41F: APPARATUS FOR LAUNCHING PROJECTILES OR MISSILES FROM BARRELS, e.g. CANNONS (smallarms F41C); LAUNCHERS FOR ROCKETS OR TORPEDOES; HARPOON GUNS (functional features or details common to both smallarms and ordnance, mountings therefor F41A; projecting missiles without use of explosive or combustible propellant charge F41B)
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)
- F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D)

## Abstract

A low-shock separation device is characterized in that an internal locking structure is unlocked and a bolt is separated by operating a specific part of components thereof using high pressure that is generated by combustion of powder.

## Claims

### Claim 1

A low-shock separation device comprising:
a housing having open top and bottom and an internal receiving space;
a cylinder disposed in the receiving space through the top of the housing and having a top hole and a bottom hole communicating with the top hole and larger in cross-sectional area than the top hole;
a housing cap fitted in a space between the housing and the cylinder and closing the top of the housing;
a piston disposed in the bottom hole of the cylinder;
a pressure cartridge partially inserted in the top hole and closing an upper end of the top hole; and
a bolt partially inserted in the bottom hole through the bottom of the housing, closing a lower end of the bottom hole, and kept in the bottom hole by a holder,
wherein a passage attenuating a collision between the cylinder and the housing cap is formed by filling a space between the cylinder and the housing cap with high pressure gas, and the passage is formed when the cylinder is moved toward the pressure cartridge by high pressure that is generated when the pressure cartridge is operated.

### Claim 2 (depends on 1)

The device of claim 1, wherein the passage has a first passage formed around a side of the cylinder and a second passage having a first end communicating with the top hole of the cylinder and a second end extending from a top to a side of the piston to communicate with the first passage of the cylinder.

### Claim 3 (depends on 2)

The device of claim 2, wherein the first passage is formed at a position where the first passage can communicate with the second passage when the cylinder is moved.

### Claim 4 (depends on 1)

The device of claim 1, comprising a deformable portion formed on the housing cap, restricting movement of the cylinder before the pressure cartridge is operated, and primarily absorbing shock by compressively deforming when the pressure cartridge is operated and the cylinder is moved toward the pressure cartridge.

### Claim 5 (depends on 4)

The device of claim 4, wherein speed of the cylinder moving toward the pressure cartridge due to the high pressure is adjusted by adjusting a surface area of the deformable portion.

### Claim 6 (depends on 4)

The device of claim 4, wherein the degree of shock absorption is adjusted by adjusting a material and shape of the deformable portion.

### Claim 7 (depends on 1)

The device of claim 1, wherein the holder is a metallic or elastic body, is partially inserted in an insertion hole formed on the bolt with the other portion supported inside a flange of the cylinder to keep the bolt in the bottom hole of the cylinder, and unlocks the bolt when the cylinder is moved toward the pressure cartridge.