Abstract: A plural dosage automatic injector comprising an elongated tubular housing assembly having side by side first and second medicament injecting assemblies each including a container, a hypodermic needle, a liquid medicament and a plunger within the forward end portion thereof and, first and second stressed spring assemblies in the rearward end portion thereof disposed in operative relation with said first and second medicament injecting assemblies for operating the latter. A manually operable safety device is provided which includes a first safety pin operable (1) when in a safety position with respect to the first spring stressed assembly to prevent actuation and release thereof and (2) when removed from its safety position to permit the actuation and release of the second stressed spring assembly.

Abstract: A dual mode automatic injector having a dual mode safety device for preventing the release of the stressed spring assembly except when it is desired to operate the medicament injecting assembly by the stressed spring assembly. The dual mode safety device comprises a first part including a pin portion disposed in a safety position extending through a central aperture in the rear wall of the housing assembly of the injector in release preventing relation with the stressed spring assembly for removal therefrom in response to a relative rearward movement with respect to the rear wall so as to permit an actuating movement to release the stressed spring assembly. The first part includes an automatic removal portion fixed to the rearward end of the pin portion.

Abstract: An assembly for enabling a respiratory medicament to be administered to a gas mask wearer without breaking the seal between the face blank of the gas mask and the wearer's face. The assembly comprises a container, a respiratory medicament dosage releasably disposed within the container, and a shroud covering the container for (1) interiorly communicating with the exterior of a normally closed passage extending through the face blank of the gas mask to the sealed interior thereof, (2) exteriorly isolating the container and (3) enabling the respiratory medicament dosage to be released from the container while the interior communicating and exterior isolating relationships are maintained.

Abstract: A plural injecting device comprising an outer housing assembly, a plurality of cartridge sub-assemblies, and a corresponding plurality of releasable spring sub-assemblies for effecting a forward movement of the associated hypodermic needle into the user's muscle tissue and the associated liquid medicament dosage outwardly through the needle, the sub-assemblies being mounted within the outer housing assembly so that as a result of the actuation of one of the releasable spring sub-assemblies the other releasable spring sub-assembly will be actuated so as to insure a substantially simultaneous injection of the plural dosages contained within the device. A safety arrangement in some embodiments provides for selective individual or plural dosage injection.

Abstract: A hypodermic injection device comprising a cartridge holder having a cylindrical body open at one end and closed at the other end, the closed end being provided with an aperture, a cartridge with the holder, the cartridge including an ampoule having a cylindrical sleeve open at one end and having a necked portion at the other end to receive a hub mounting a cannula, the cannula facing the apertured end of the cylindrical body, a piston slidably carried within the sleeve adjacent the open end thereof to define a medicament chamber between the piston and cannula, fluid medicament in the medicament chamber, the piston having a concave face on the side forming one end of the medicament chamber, a spring power assembly adjacent the open end of the ampoule sleeve for moving the cartridge forward and for injecting the fluid medicament, spacer means positionable between the outer face of the piston and the adjacent spring power means to vary the position of the piston within the ampoule sleeve and thereby control the