US1946898A - Fuse clamp - Google Patents

Description

J. E. CARLSON Feb. 13, 1934.

FUSE CLAMP Filed May 20, 1932 Ig'. E-

L L Jimi y INVENTOR JOHN E2C f Patented Feb. 13, 1934 UNITE-D STATES FUSE CLAMP John E. Carlson, Forestville, Conn., assignor to The Trumbull Electric Manufacturing Corn-V pany, Plainville, Conn., a.

necticut Application May 20', 1932.

Claims.

My invention relates particularly to devices for clamping and holding the contact or ferrule ends of cartridge type fuses in operative position.

One object is to provide a simple but effective 5 device for positively locking or clamping the fuse in place so that it can not be accidentally detached or displaced.

Another object is to provide a clamping device which will maintain eiective electrical contact underall conditions of use.

Another object is to provide a means for clamping the terminal or contact ends of fuses in electrical contact with the correlated receiving clips or terminals with considerably more mechanical ly than is possible with the ordinary commercial types of receiving clips or contacts.

Another object is to provide a fuse clip and clamping device which can be made and assembled as a unit.

Another object is to provide a construction which will hold a fuse securely in electrical contact even though the dimensions of the ferrule ends of the fuse may vary somewhat from the standard dimensions as set by the National Board of Fire Underwriters.

The invention in its simplest form includes a clamp preferably provided with a resilient stationary jaw and with a hinged jaw, the latter being movable by means of a screw, so as to permit the insertion and removal of the fuse.

Fig. 1 is a iront View of the construction embodying the improvements of my invention, the clamps being connected directly to the cylindrical terminals of a fuse.

Fig. 2 is a side view oi the same.

Fig. 3 is an end view of one of the fuseclamps showing the fuse in place and the base being shown in section on the plane of the line 3--3 of Fig. 1.

Fig. 4 is a perspective view of one of the clamps in the open or extended position.

Fig. 5 is a perspective view of a modication adapted to hold the terminal of a fuse having a knife blade type terminal end.

Figs.'6"and 7 are other modiflcations of the clamp.

A base 7 is intended to illustrate diagrammatically an insulating support on which fuses are customarily mounted. 8 are the circuit terminals, and 9 is a fuse, all of conventional form.

In the forms shown in Figs. 1, 2, 3 and 4 in the drawing, the clamp consists of a base portion 10 having a jaw l1 integral with it. This jaw and base may be mutually reinforced by the pressure and much more eifectively and secure-- corporation of Con- Serial No. 612,429

The movable jaw 14 has hinge pintles 15 pivoted in lugs 16-which are preferably integrally connected with the base 10 and the side flanges 13. The movable jaw has an angularly disposed foot 17 carrying a screw 18 which is adapted to abut against an extension 19 of the base of the clamp to f orce the `movable jaw into clamping engagement with the fuse. The clamp is adapted to be secured to a terminal by means of a screw 20 passing through the support 7 and having threaded engagement with a screw seatl or a threaded nut 2l.

The clamps are arranged in pairs and, to insert a fuse, the movable jaw 14 of each clamp is retracted far enough to permit the insertion of one end of the fuse and the fuse is then clamped in place by tightening up on the screws 18-18 which forces each foot 17 upwardly and each jaw 14 inwardly. A very substantial pressure can thus be applied so as to positively clamp and lock the fuse in place with considerable mechanical pressure.

This avoids the possibility of overheating which often occurs with the usual commercial type of spring clips. There is also no dangerof the fuse being jarred or accidentally displaced or loosened.

In Fig. 5 I have shown a form of clamp in which the jaws 22 and 23 are flat so as to enable them to clamp the blade of that type of fuse which has blade-like terminals. This form of construction also has a base 24 to which the jaw 23 is lhinged and the hinge jaws are movable by means of the screw 25 in a manner similar to that shown in the other figures.

In Fig. 6 I have shown a modified form of clamp which differs from the form sh-own in Figs. 1, 2, 3 and 4 in that the movable member 14 is pivoted to the stationary clamping member at 15' at the opposite side of the axial center line oi' the clamp and the screw 18 passes through the lug 17 to engage the flange 19 on the base.

In Fig. 7 I have shown still another modication in which the movable clamping member 14" is pivoted at 15 to a vertically extended arm or support 16 of the stationary member and the clamping screw 18" is carried by the same arm of the stationary member and bears against the outer face of the hinged jaw 14, which con-- struction differs from Figs. 3, 4, 5 and 6 in which forms the clamping screw is carried by the movable member.

Obviously in the forms of clamps in which a screw is employed for moving or tilting the movable jaw to clamp a fuse, the head of the screw rib such as 12y and flanges 13 at opposite sides.

may be oi* any desired form, for instance, it may be a common round-headed screw with the usual slotthe head may be enlarged land knurled or it may be of wing-like form to permit a powerful nger grip or the head of the screw may be embedded in a form of insulating material.

li claim:

1. A fuse clamp comprising a base portion having a fuse holding Contact jaw integrally connected therewith, a movable jaw hinged to said base and a screw coacting with a part of the hlngedjaw for forcibly tilting and clamping the movable jaw against the terminal of a fuse.

2., A fuse clamp comprising a base portion having a stationary contact jaw and side flanges integral therewith, a movable jaw hinged between the side anges, said movable jaw having an exltended foot and a screw in said foot for coacting with a portion of the base of the clamp for operably moving said jaw.

3. A fuse clamp comprising a base portion, a stationary jaw integral with and projecting from Lalanne the base and having a reinforcing rib, a movable contact jaw hinged to the base and having a :toot extending substantially parallel with the base and means coacting with said foot and said base for forcing the contact portion of the movable jaw toward the stationary jaw.

ai. A fuse clamp comprising a base portion and a stationary contact jaw integral therewith, lugs SGTBW.

JOHN E. CARLSN.

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