Littelfuse, Inc.

Victor Comptometer Corporation

Rudolf K Schaefer

Robert H Wilczewski

A bayonet lock for retaining the knob of a fuseholder to an axial-insertion fuseholder body is formed by camming surfaces disposed in the walls of grooves formed in the walls of the insertion passage and on the surfaces of a knob extension which enters the passage. The engaging surfaces of the lock are of insulating material. Axial insertion and rotation of the knob retains an inserted fuse. Camming surfaces are provided so that upon rotation of the fuseholder knob in an unlocking direction, these camming surfaces cause an automatic outward ejection of the fuseholder knob. Additional camming surfaces are provided to assist in insertion so that when operator pressure is released from the knob, the knob compression spring forces the knob axially outward into engagement therewith, the surfaces being configured to provide a force urging the knob in the locking direction. A conducting fuse end cap contacting sleeve is configured at the closed end thereof to grippingly engage an axial post extending inwardly into the fuse-accepting passageway. The post is configured to extend significantly along the axis of an axially disposed compression spring. The length of the post is chosen so that knob insertion is terminated when the post strikes the outer end of an overlength inserted fuse, thereby preventing damaging overcompression of the spring.

Shock-safe fuseholder assembly

A fuseholder socket assembly including a side terminal with preferably a pair of helical knob contact finger-engaging surfaces for initially guiding a knob for movement in both axial and circumferential directions toward a locking position where a pair of J-shaped knob contact fingers can interlock with a socket body side terminal with not more than about one-half turn of the knob. The assembly includes a pair of axially inwardly facing abutment shoulders preferably formed by a pair of rigid channel-forming fixed fingers projecting from the side terminal and against which knob contact fingers are urged by a biasing means when the knob is turned into a final locking position and then released. Good electrical contact is preferably achieved by a pair of body side terminal outwardly axially projecting, radially outwardly deflectable resilient contact arms. Each arm has a radially inwardly projecting contact on the inner side thereof positioned to be engaged with a wiping contact by one of the said knob contact fingers when it is rotated into its locking position.

Shockproof fuseholder

A fuse holder includes a fuse carrier insertable into a passageway in a fuse holder body mountable in a vertical panel opening. The fuse carrier supports an active fuse in a U-shaped recess loosely holding the fuse in a horizontal position extending parallel to the panel. The fuse holder body includes a shoulder adjacent the front end thereof for preventing the complete withdrawal of the fuse carrier from said fuse holder body when the fuse carrier is pulled to the front of the body. The fuse carrier has pivot pins for pivotally engaging this shoulder so that the carrier drops into a position where it hangs downwardly from said fuse holder body where a fuse releasably held on the carrier is exposed for removal. The fuse holder body and fuse carrier have releasable interlocking parts which become interlocked when the fuse carrier has been pushed into a fully retracted position within the fuse holder body where the fuse terminals engage with terminal clips. The fuse carrier has a gripping handle which when depressed releases the interlocking parts to permit partial withdrawal of the fuse carrier from the fuse holder body. A spare fuse-receiving cavity is located behind the handle to support the spare fuse oriented parallel to the active fuse.

Panel mountable fuse holder

One piece ribbon spool molded from suitable plastic, with no fastening hardware with spool or on ribbon required, comprising spaced circular side guide flanges, a central cylindrical hub joined by radial ribs with ribbon-receiving segmental cylindrical wall, a female ribbon latch forming a hook for receiving free end of a male ribbon latch to anchor end of ribbon therebetween, other end of male latch forming unitary hinge connection, and outer surfaces of latches when in ribbon-anchoring position describing extension of cylindrical surface of segmental ribbon-receiving wall, the male latch being narrower than the space separating the side flanges, and apertures in the latter opposite the latches to facilitate engagement and disengagement of the ribbon and the spool.

Growing community of inventors

Des Plaines, IL, United States of America

Rudolf K Schaefer