US2262068A - Fuse - Google Patents

Description

NQV. 11, 1941. G TOWNER 7 2,262,068

FUSE

Filed April 6, 1958 Inventor Harald BJPuwnEr Patented Nov. 11, 1941 UNITED STATES PATENT OFFICE (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 G. 757) 1 Claim.

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates in general to a fuse and more particularly it has reference to means for rotatably connecting the base and setting cap of a time fuse.

In fuses wherein the cap is to be rotatable with respect to the base it has been the usual practice to connect these units by some form of coupling ring.

The purpose of this invention is to provide a simple and effective connection which will permit relative rotation of the cap and base to set the timing mechanism of the fuse and which will prevent their derangement under the influence of centrifugal force during flight.

To these and other ends, the invention consists in the construction, arrangement and. combination of elements described hereinafter and pointed out in the claim forming a part of this specification.

A practical embodiment of the invention is illustrated in the accompanying drawing, wherein:

Fig. 1 is a longitudinalsectional view of a fuse casing whose units are held in assembly by the improved coupling means;

Fig. 2 is a sectional view on the line 2-2 of Fig. 1;

Fig. 3 is an enlarged sectional view on the line 3--3 of Fig. 1.

Referring to the drawing by characters of reference there is shown a fuse casing comprising a base 5 and a rotatable setting cap 6. The base is formed with a reduced upper part I for receiving the lower end of the cap which rests upon an annular seat 8 established in the base.

The lower end of the cap is provided internally with a radial circumferential or annular groove 9 which, when the cap is resting on the seat, registers with a radial circumferential or annular groove l9 provided externally on the reduced part 1 of the base to form a channel for housing a resilient split ring H which interlocks the cap and base against axial displace ment. The groove 9 is of sufficient depth to completely house the resilient split ring H during the assembly of the cap and base. The split ring I i has a normal internal diameter which is less than the external diameter of the part 1 and in order to facilitate assembly of the cap and base, the part 1 is provided with a beveled outer edge I2 for expanding the ring during the movement into assembly position. As soon as the cap engages the seat 8, the grooves 9 and ID are in alignment and the ring being free to resume its normal dimension moves into the groove I0.

The ring II is formed with undulating upper and lower faces respectively l3 and H, the high spots frictionally engaging the walls forming the sides of the grooves 9 and I0 and offering suflicient resistance to rotation to insure retention of the parts in adjusted position during flight.

It is to be understood that if the ring is to be carried by the base during assembly then the base will have a groove of sufficient depth and the beveled edge will be provided on the cap.

I claim:

In a fuse casing, a base having an upper part with an annular beveled edge, a rotatable cap fitting on the upper part of the base, said base and cap being provided with radial, annular grooves with their depth dimensions normal to the axis of the fuse and which are in register when said base and cap are assembled, a resilient split coupling ring disposed in the grooves and having undulating upper and lower faces and a depth between faces greater than the width of the grooves whereby to resiliently engage both side walls of both grooves and yieldingly interlock said base and cap against axial separation, the normal internal diameter of said ring being substantially the same as the diameter of the bottom of the groove in the base while the normal external diameter is such that the peripheral portion of the ring will normally project without the groove in the base, said groove in the cap being of sufficient depth to completely house the ring when the same is radially expanded against its own resiliency, whereby the ring may be initially assembled in the groove of said cap and during assembly of the base and cap be expanded into the groove in the cap by said beveled edge to facilitate assembly.

HAROLD G. TOWNER.

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