US2119184A

US2119184A - Motor safety fuse

Info

Publication number: US2119184A
Application number: US100718A
Authority: US
Inventors: Elmer D Stassen
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-09-14
Filing date: 1936-09-14
Publication date: 1938-05-31
Anticipated expiration: 1955-05-31

Description

May 3l, 1938.

E. D. STASSEN MOTOR SAFETY FUSE Filed Sept. 14, 1936 @M 0 l2 o INVENTOR ATTORNEYS Patented May 31, 1938 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to motor safety fuses and has for an object to provide a fuse that will be interposed in the ignition circuit and which will be mounted so that a combustible extremity will be mounted on the engine head and in the event of excessive heat the fuse will be melted and the ignition circuit thus opened to prevent damage to the motor.

With the above and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modifications may be resorted to within the scope of the appended claim without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawing forming part of this specification,

Figure 1 is a plan view of a motor equipped with a safety fuse constructed in accordance with the invention.

Figure 2 is a side elevation of the fuse and its mounting on the motor.

Figure 3 is a plan view of the fuse and its mounting detached from the motor.

Figure 4 is an enlarged cross sectional view of the fuse.

Referring now to the drawing in which like characters of reference designate similar parts in the various views, III designates a support for mounting the fuse upon the cylinder head II, the support preferably being formed of strap metal and including a straight flat portion I2, downwardly directed parallel legs I3, and outwardly directed feet I4, which latter are adapted to lie at upon the head of the motor and be secured thereto by bolts I5 passed through suitable openings I6 in the feet and in the head of the motor.

The fuse comprises a hollow cylindrical body II formed of insulating material closed at the top by a cap I8 having vents I9 therein. A fusible wire 20 is disposed in the interior of the body and has one end exposed on the exterior of the body as shown at 2 I. The other end of the wire is secured to the body by a metal ring 22. A fusible member 23 closes the bottom of the body and has the inner face spaced slightly from the fusible wire 20. 'Ihe fusible member 23 is formed of any suitable material that will burn up at a temperature of about 250 degrees F. and melt the fusible wire 20 to open the ignition circuit as will presently appear.

The body I1 is encased in a cylindrical metal threaded member 24 which is screwed into a threaded ring 25 carried by an insulating socket member 26 which is provided with ears 21 that are riveted, as shown at 28 to the mounting member Il),

An angular clip 29 is connected to the metal ring 25 and is provided with a screw 30 to which one terminal 3I of the ignition circuit 32 may be attached. An angular clip 33 is mounted in the bottom of the insulating socket member 26 to be engaged by the metal ring 22 to which the fusible wire 20 is attached. A set screw 34 forms means for attaching the other terminal 35 of the ignition circuit to the clip 33. The terminal wires 3I and 35 are disposed above the mounting member I0 and are trained through respective openings 36 and 31 formed in the mounting member so that they will not become accidentally dislodged.

A conventional switch 38 is mounted on the instrument board of the Vehicle and controls a circuit formed by Wires 39 and 40 which are connected to the

wires

32 and 35 outside of the mounting member I0. The purpose of the switch 3B is to by-pass the ignition circuit around the fuse after the fuse has become burned in an inconvenient place such as on a railroad track, or the like.

In operation the ignition current passes through the wire 3|, clip 29, metal ring 25, metal member 24, fusible wire 20, metal ring 22, clip 33, and wire 35. When a temperature dangerous to the motor is reached, say about 250 degrees F. the combustible material 25 will become ignited and will burn up and consume the fusible wire 20, such combustion being accelerated by draft upwardly through the opening 4I in the bottom of the socket 26, through the bore of the insulating cylinder I1 and through the vent openings I9. Thus the ignition circuit will be broken until a new fuse be screwed in or the switch placed in contact position.

From the above description it is thought that the construction and operation of the invention will be fully understood without further explanation.

What is claimed is:

An electric fuse comprising a hollow cylindrical insulating body, a cap closing one end of the body and having vent openings, a combustible element closing the other end of the body, a fusible circuit wire carried in the body contiguous to the combustible element and adapted to be melted by ignition of the combustible element, a metal shell housing the body and forming one circuit terminal for said fuse, a metal ring on the body spaced from the shell and forming the other circuit terminal for the fuse, an insulating socket member housing the shell and the ring, and mounting means on the socket member.

ELMER D. STASSEN.