DUAL MODE AUTOMATIC INJECTOR

摘要

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. The automatic removal portion is of a size greater than the pin portion but less than the rear wall so as to present a forwardly facing surface spaced rearwardly from the rear wall operable to be engaged by a holding member while a moving member is moved forwardly into engagement with the rear wall to provide both a relative rearward removal movement for the pin portion and an actuating movement for the stressed spring assembly. The dual mode safety device also includes a separate second part and a connection between the first and second parts for (1) enabling the second part to be connected with the first part while the pin portion of the latter is in its safety position in a manual mode position wherein the first part is in rearward motion transmitting relation to the second part and (2) enabling the second part to be removed from the manual position while the pin portion of the first part is retained in its safety position. The second part includes a cap portion of a size and shape to be conveniently manually grasped by a user and moved rearwardly with respect to the housing assembly in order to effect the removal of the pin portion from its safety position when the second part is in its manual mode position.