Abstract: The connection assembly for boxes includes a connection support which connects integrally a base plate and a cover plate which faces to the base plate upwardly via a predetermined space; a rotary shaft member which is supported pivotably by and perpendicular to the base plate and the cover plate; an engage piece which is installed into the predetermined space at a horizontal state, capable of rotating with the rotary shaft member together; a return spring, a center part thereof wound around the rotary shaft member and both ends thereof supported by a spring pressure part of the rotary shaft member and an engage piece of the base plate; a lock piece for the engage piece, an end part thereof which is supported pivotably by a fixed shaft which is provided at one side of the base plate, having an engage part which projects from an upper surface of the base plate; and a spring which is attached to the fixed shaft, capable of biasing the lock piece to an engagement direction.

Abstract: The connection means for boxes includes a connection support which connects integrally a base plate and a cover plate which faces to the base plate upwardly via a predetermined space; a rotary shaft member which is supported pivotably by and perpendicular to the base plate and the cover plate; an engage piece which is installed into the predetermined space at a horizontal state, capable of rotating with the rotary shaft member together; a return spring, a center part thereof wound around the rotary shaft member and both ends thereof supported by a spring pressure part of the rotary shaft member and an engage piece of the base plate; a lock piece for the engage piece, an end part thereof which is supported pivotably by a fixed shaft which is provided at one side of the base plate, having an engage part which projects from an upper surface of the base plate; and a spring which is attached to the fixed shaft, capable of biasing the lock piece to an engagement direction.

Abstract: A connection structure of a storage compartment consists of handles stored into a storage part provided at a top board member of the storage compartment; engaging pieces arranged at a base board and engages with means for engaged in the storage compartment located below due to a spring power of a spring in case that the handles are laid flat at a vertical state respectively; means for traction to connect to the handles and engaging piece respectively; and the engaging piece, in case that the storage compartments having same form are piled up respectively, interlocks a movement of the handles in a case that the handle installed with the storage compartment located above is brought at a standing-up state and rotates in a moving direction against the spring power of the spring, so that it can connect or dissociate automatically by only operating the handle prepared in the top board member.

Abstract: A connection structure of a storage compartment consists of handles stored into a storage part provided at a top board member of the storage compartment; engaging pieces arranged at a base board and engages with means for engaged in the storage compartment located below due to a spring power of a spring in case that the handles are laid flat at a vertical state respectively; means for traction to connect to the handles and engaging piece respectively; and the engaging piece, in case that the storage compartments having same form are piled up respectively, interlocks a movement of the handles in a case that the handle installed with the storage compartment located above is brought at a standing-up state and rotates in a moving direction against the spring power of the spring, so that it can connect or dissociate automatically by only operating the handle prepared in the top board member.

Abstract: In accordance with this invention, in order that a document filing case can be piled on another document filing case in a folded state before use and can be constituted as a box with ease in use, a document filing case comprises: an upper wall member having one end portion pivotally connected to the front frame member, and the other end portion guided into longitudinal grooves formed in the rear frame member; a bottom wall member having one end portion pivotally connected to the rear frame member so as to oppose the upper wall member and the other end portion guided into longitudinal grooves formed in the front frame member; left and right side walls pivotally connected to either the upper wall member or the bottom wall member so that these side walls can rotate in a vertical direction from a folded state when the bottom wall member and the upper wall member rotate so that they are opposite to each other in a horizontal state; a rear wall attached on the rear frame member; and a front wall pivotally connected