US1205921A - Safety device for shell-fuses. - Google Patents

Description

H. MOREN. SAFETY DEVICE FOR SHELL FUSES. APPLICATION FILED APR 8 1915 Patented Nov. 21, 1916.

UNITED STATES PATENT orrron.

OR TO AKTIEBOLAGET BOFORS-GULLSPANG, A COMPANY LIMITED.

SAFETY DEVICE FOR SHELL-FUSES.

Specification of Letters Patent.

Patented Nov. 21, 1916.

Application filed April 8, 1915. Serial No. 19,877.

To all whom it may concern:

Be it known that I, HUeo Money, a subject of the King of Sweden, residing at Bofors, Sweden, have invented new and useful Improvements in Safety Devices for Shell-Fuses, of which the following is a specification.

The present invention relates to a shell fusewhich is simple and cheap in manufacture and which, in safe condition, provides absolute safety in the case of an accidental ignition of the primary or secondary igniting charge, the latter being, as known, sensitive to some extent to exterior influence and sufficiently powerful to necessitate special steps of caution, for instance inclosing it, in the safe condition, in an expansion chamber the walls of which are internally lined with a sleeve of suitable material for resisting an explosion of the secondary igniting chz-irge in this position. In these fuses, in the safe condition, the detonator and the detonator charge are kept separated by a member which, on firing the gun, obtains a relative rearward movement by reason of its inertia and thereby compresses a return member, generally a coiled spring, which, as soon as the projectile has left the muzzle of the gun, resumes its original shape and returns the separating member, which latter simultaneously moves the detonator and detonatorcharge together by means of an elastic locking device, so that an explosion of the detonator may be communicated to the detonator charge. According to the present invention such an arrangement is made that the sleeve internally lining the \illlS of the expansion chamber either in itself constitutes the member which carries the detonator in active position with relation to the detonating charg or vice versa, or the said sleeve is directly connected to said actuating member, the lining sleeve or liner then being made so much shorter than the surrounding chamber as to be sufficiently reciprocatable for the action.

In the accompanying drawing Figure 1 shows a form of the invention, adapted to point fuses, such a fuse being shown in a longitudinal section in safe condition; Fig.

2 shows a view corresponding to Fig. 1 in active condition. Fig. 3 shows a longitudinal section of a base fuse embodying the invention in safe condition and Fig. 1 a correspondlng view in active condltion.

In the form shown m Figs. 1 and 2, the

is provided with an axial tire channel 9 com- 7 g with the axlal fire channel 10 in the fuse body 1, leading to the charge 11 of the detonator sleeve. On the rear end of the body 1 a sleeve shaped portion 12 is screwed, while the detonator sleeve 13 is screwed into said body. Inside theportion 12. the liner 1+ is movable. This liner is made resilient in both ends by slits of which only those in the forward end are illustrated in the Figs. 1 and 2., the slits in the rear end being situated in another plane. These slits have for their purpose to make the sleeve resilient. In Fig. 1 it is at rest against the body 1 and surrounded by the return spring 1:") which rests, at its front end, against the flange 16 and at its rear end against the shoulder 17 on the fuse portion 12. Inside the rear end of the. latter, the sleeve 19 containing the detonating charge 18 is situated, resting at the rear against the bottom 20 of the fuse body and being kept from forward motion by the rear, contracted end of the sleeve 14. In the front closure 21 of the sleeve 19, a hole is provided for the passage of the detonator sleeve 13, and behind this hole there is a recess 22 in the charge 18 for receiving the detonator sleeve 13.

In Fig. 2 which shows the position of the same parts after the projectile has left the muzzle of the gun, the primary activating members 7 and 8 have first liberated the hammer G in a known manner, so that ignition can occur on impact, but moreover the sleeve or liner 11, which has been retracted at the initial shock and squeezed around the sleeve 19 with its rear, contracted end which is somewhat resilient, has carried forth said sleeve 19 when returned by the spring 15 to its original position. The sleeve l i thus forms an activating device for the secondary members of the fuse, so as to move, when the gun is fired, the detonator and detonator charge into operative mutual position. Instead of being resilient in its rear portion and thus serving in itself as an activating member. the sleeve of course may be combined with a particular resilient member of municating at its rear-end such nature as to squeeze the detonator to v with the ignition point 32 and the fire chan- I nels 33 and containing a powder charge 34.

.latter.

From this bore 30, a fire channel 35 leads forward to the charge 36 of the detonator sleeve. The fuse body 23 has two front bores 37 and 3S, separated by a partition wall 39. The bore 37 is closed by the cover 40 and contains the detonating charge 41 which has a recess 42 fitting the detonator sleeve 43. The partition wall 39 has a perforation suitable for the passage of sleeve 43. Inside the bore 38. resting against the partition wall 39, is the movable sleeve 4 V which is firmly secured to the resilient member 45. Said member retains the detonator sleeve 43 in the position shown by engaging the slot 4L6. A return spring 47 rests with one end against the rear wall of the bore 38 and with the other against the resilient member and-surrounds the detonator sleeve 43. The rear end of the latter rests against the partition between the bores 30 and 38. From this partition a stud 48 pro jects, which is traversed by the above mentioned fire channel 35, and which engages a hole in the cover- 49 of the detonator sleeve 43 and serves as a guide for the In Fig. 4, which shows the same form of the fuse after the projectile has left the muzzle-of the gun, the activating members 28 and 29 have released the hammer 27 while the sleeve or liner 4% has been returned to its forward position by the spring 47 together with the detonator sleeve which is engaged by means of the resilient member 45. This member th'us here is the secondary activating member.

If in the position of the members shown in Figs. 1 or 3, the charge 11 (or 36) of the detonator sleeve 13 (or 43) would explode either by an explosion of the ignition cap or for some other reason, the liner 14 (or 44) which is destroyed itself, will prevent the bursting of the surrounding fuse body and thus the ignition of the surrounding shell charge. The bottom of the detonator sleeve which is flattened by the explosion sticks in the hole in the partition wall 39 and thereby prevents the ignition of the bursting charge 18 or 41.

' The use of a liner in the explosion chamber enables a softer and more easily worked material to be used in the fuse body proper.

Having now particularly described the nature of my invention and the manner of its operation, what I claim is:

l. A safety device for fuses consisting of a movable liner for the walls of the expansion chamber of the fuse having such a length that it surrounds the detonator in' safe condition along the entire length of same and protects the walls of the expansion chamber in case of an unintentional detonation of the detonator, said liner at the same time serving as an actuating member.

2. A safety device for fuses consisting of a movable liner for the walls of the expan sion chamber of the fuse having such a length that it surrounds the detonator in safe condition along the entire length of same and protects the walls of the expansion chamber in case of an unintentional detonation of the detonator, said liner being resilient at one end.

3. A safety device for fuses, consisting of a movable liner for the walls of the expansion chamber of the fuse having such a length that it surrounds the detonator in safe condition along the entire length of same and protects the walls of the expansion chamber in case of an unintentional detonation of the detonator, and a resilient member to which said liner is connected, sald resilient member being adapted to grasp the detonator and carry it forth with the liner.

4. A safety device for fuses, consisting of a movable liner for the walls of the expan sion chamber of the fuse having such a length that it surrounds the detonator in safe condition along the entire length of same and protects the Walls of the expansion chamber in case of an unintentional detonation of the detonator, and a resilient member, connected to said liner and adapted to grasp the detonator charge and carry it forth with the liner.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

- HUGO MOREN.

Witnesses KAN EISMAN,

ERIK Fnonn'r'r.

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