Safety device and flight vehicle provided with safety device
A safety device and a flight vehicle provided with the safety device. The safety device includes an actuator, an ejection object ejected in one direction by the activation of the actuator, a bottomed cylindrical housing lid (bottomed cylindrical member) that houses the actuator and the ejection object, and a substantially disk-shaped bottom portion that closes an opening end portion of the housing lid. One end of the first coupling member is connected to a part of the ejection object, and the other end of the first coupling member is connected to the inside of the housing lid. The actuator includes a piston member and a gas generator that generates a driving force for ejecting the housing lid by sliding the piston member and causing the piston member to abut on the housing lid and is provided on the bottom portion. One end of the second coupling member is connected to the other part of the ejection object, and the other end of the second coupling member is connected to a tip portion.
1 . A safety device for a flight vehicle comprising:
a cylindrical member including an opening end portion provided at a first end and a top plate portion provided at a second end;
a bottom portion attached to the opening end portion of the cylindrical member in an initial state, so that the opening end portion can be opened at a time of activation;
an actuator provided on the bottom portion, and including a piston and a power source configured to generate a driving force for ejecting the cylindrical member by sliding the piston toward the top plate portion and cause the piston to contact the cylindrical member;
a parachute or paraglider configured to be accommodated between the cylindrical member and the bottom portion;
a first coupling member including a first end coupled to the parachute or paraglider and a second end coupled to the cylindrical member; and
a second coupling member including a first end coupled to the piston and a second end coupled to the parachute or paraglider,
wherein when the cylindrical member is ejected, the parachute or paraglider is also configured to be ejected via the first coupling member,
wherein the first end of the second coupling member is connected to a position of the piston's tip that does not interfere with the contact between the piston and the cylindrical member, and
where in the bottom portion is configured to be fixed to an airframe of the flight vehicle.
2 . The safety device according to claim 1 , wherein
the piston is provided at a position where the piston contacts a central portion of the top plate portion of the cylindrical member at a time of activation, and
the central portion is a portion or a member having higher strength than a portion other than the central portion and having impact strength against impact when the piston contacts the central portion.
3 . The safety device according to claim 1 , wherein
the second end of the first coupling member is coupled to a location other than a position where the piston contacts a central portion, and
the central portion is a portion or a member having higher strength than a portion other than the central portion and having impact strength against impact when the first coupling member is pulled at the time of activation.
4 . The safety device according to claim 1 , wherein the bottom portion includes a protruding portion at an edge portion, the protruding portion facing a side wall portion of the cylindrical member before activation, the safety device further comprising:
an engagement mechanism that engages a side wall portion of the opening end portion and the protruding portion by inserting a pin member into a first through hole penetrating toward a center of the cylindrical member in the side wall portion of the opening end portion and a second through hole penetrating toward a center of the bottom portion in the protruding portion; or
a locking mechanism that locks the side wall portion of the opening end portion and the protruding portion by a snap-fit method in which fitting is performed using elasticity of a material constituting the cylindrical member or the protruding portion.
5 . A flight vehicle comprising:
an airframe;
the safety device according to claim 1 coupled to the airframe, a payload being the flight vehicle; and
a propulsion mechanism coupled to the airframe to propel the airframe.
6 . The safety device according to claim 2 , wherein
the second end of the first coupling member is coupled to a location other than a position where the piston abuts on the central portion, and
the central portion is a portion or a member having higher strength than a portion other than the central portion and having impact strength against impact when the first coupling member is pulled at a time of activation.
7 . The safety device according to claim 2 , wherein the bottom portion includes a protruding portion at an edge portion, the protruding portion facing a side wall portion of the cylindrical member before activation, the safety device further comprising:
an engagement mechanism that engages a side wall portion of the opening end portion and the protruding portion by inserting a pin member into a first through hole penetrating toward a center of the cylindrical member in the side wall portion of the opening end portion and a second through hole penetrating toward a center of the bottom portion in the protruding portion; or
a locking mechanism that locks the side wall portion of the opening end portion and the protruding portion by a snap-fit method in which fitting is performed using elasticity of a material constituting the cylindrical member or the protruding portion.
8 . The safety device according to claim 3 , wherein the bottom portion includes a protruding portion at an edge portion, the protruding portion facing a side wall portion of the cylindrical member before activation, the safety device further comprising:
an engagement mechanism that engages a side wall portion of the opening end portion and the protruding portion by inserting a pin member into a first through hole penetrating toward a center of the cylindrical member in the side wall portion of the opening end portion and a second through hole penetrating toward a center of the bottom portion in the protruding portion; or
a locking mechanism that locks the side wall portion of the opening end portion and the protruding portion by a snap-fit method in which fitting is performed using elasticity of a material constituting the cylindrical member or the protruding portion.
9 . A flight vehicle comprising:
the airframe;
the safety device according to claim 2 coupled to the airframe, a payload being the flight vehicle; and
a propulsion mechanism coupled to the airframe to propel the airframe.
10 . A flight vehicle comprising:
the airframe;
the safety device according to claim 3 coupled to the airframe, a payload being the flight vehicle; and
a propulsion mechanism coupled to the airframe to propel the airframe.
11 . A flight vehicle comprising:
the airframe;
the safety device according to claim 4 coupled to the airframe, a payload being the flight vehicle; and
a propulsion mechanism coupled to the airframe to propel the airframe.
12 . The safety device according to claim 1 , wherein the piston is located in a center of the bottom portion and the cylindrical member is ejected in a sliding direction.
13 . The safety device according to claim 1 , wherein the piston is not ejected.