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Training device for an automatic injector

  • US 5,037,306 A
  • Filed: 10/10/1990
  • Issued: 08/06/1991
  • Est. Priority Date: 10/24/1989
  • Status: Expired due to Fees
First Claim
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1. A training device for an automatic injector comprising a punch member and cylindrical outer sleeve comprising in its rear portion a discharge mechanism and in its front portion a holder for the punch member so as to lock the punch member against forward movement,wherein the discharge mechanism comprises a pistol sleeve which is open at its front end, a plunger which is movable in the pistol sleeve, a coil spring which acts on the plunger to move the plunger out of the front end of the pistol sleeve outward, a locking device slidably positioned in a portion of the plunger which cooperates with the plunger to prevent undesired forward movement thereof, and a safety member to block unintentional unlocking of the locking device;

  • wherein said locking device comprises a pin including means which allow the pin to remain at least for the greater part within the plunger when the plunger is unlocked;

    such that, after removing the safety member, the plunger is unlocked by a backward movement of the holder and punch member with respect to the outer sleeve, activating the device;

    wherein the holder for the punch member comprises a sleeve-like rear portion which is open at each end and which, after activating the device, is traversed by a rear end portion of the punch member, and a nose portion, said nose portion of the holder comprising a central aperture and serving to stop the forward movement of the punch member in the holder after the device is activated, and allowing a front end portion of the punch member to pass;

    in which the punch member is accommodated in the holder such that its front prod-shaped end portion, which is dimensioned such that it can pass through the central aperture in the nose portion of the holder outward, is inside the holder prior to use;

    such that the rear end portion of the punch member comprises means which, in cooperation with means provided on an inner wall of the resilient sleeve-like rear portion of the holder, prevents undesired forward movement of the punch member in the holder, in which the device is proportioned such that after being activated, the wall of the holder can expand resiliently outward with the outer sleeve to allow the punch member to pass; and

    wherein the device further comprise spring means interposed between the punch member and the locking device which enables locking of the plunger when the device is ready for reuse.

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