Abstract: A novel fin for surfboards and watercraft that includes a pivoting rudder-like section that swings out when a turn is commenced, enhancing the maneuvrability of the surfboard by reducing the resistance of the fin as it moves sidewards through the water in a turn and by redirecting the water flow through the pivoting rudder section in the direction of the turn. A fixed blade attaches to the surfboard and a separate pivoting fin section is joined to the fixed blade by two pivot pins. Protruding from a vertical hole in the top of the pivoting fin section is a spring loaded pin which presses into a channel in the underside of a foil integrated into the underside of the fixed blade mounting section. The channel is deepest in the center of the foil thus the spring loaded pin in travelling back and forth along the channel seeks the deepest portion which tends to align the two fin blade sections.

Abstract: A compass type instrument capable of describing curves, circles and ellipses of infinitely variable angle and size. The central column of the instrument is supported on a foot that aligns the instrument with the center of the desired ellipse and maintains the instrument still and perpendicular to the surface to be marked. Removably mounted on the central column is a circular cam that is hinged symmetrically along it's diameter. Non-circular symmetrically hinged shapes may be substituted to alter the curve. The extent that this cam is folded about itself is adjustable and determines the angle of the ellipse described. An articulated follower arm is adjustably mounted to the top of the central column. About the central column rotates the upper section of the follower arm that pivots at a point variable from the center of the column. The upper follower arm is spring loaded in order to keep contact with the cam.

Abstract: The fuse holder contains a socket and a head member loosely seated in the socket by a quick release closure, and can be removed along the lengthwise axis of the fuse holder. Seated in the socket at its closed end is a base contact containing a connection tab and a lateral contact having a connection tab. At the head member, the closed end of which is located at the open end of the socket, there is provided a substantially U-shaped, asymmetric connection conductor fixedly clawing into the head member by retaining flaps provided at a web portion of the connection conductor. The unequal legs of the connection conductor extend from the web portion at an inclination inwardly at a predetermined location towards the lengthwise axis of the fuse holder to an internal contact location for a first cap member of the fuse insert. A second cap member thereof is pressed by an axial compression spring against the base contact.

Abstract: The fuse holder comprises a socket member composed of two thermoplastic members joined by ultrasonic welding with formation of a solder-tight welding joint or seam. Contact members disposed within the socket member extend to the exterior and include sealing members or locations which are sealingly enclosed in the welding joint. A lateral contact of these contact members is connected electrically to the connection conductor of a head member made of synthetic material by a bayonet joint and a spring is provided to supply the engagement pressure effective at the fuse.

Abstract: The fuse holder contains a socket and a head member which is loosely seated in the socket by means of a quick release closure, such as a bayonet connection and can be removed along the lengthwise axis of the fuse holder. Seated in the socket at its closed end is a base contact containing a connection tab or flag and a lateral or side contact having a connection tab or flag. At the head member, the closed end of which is located at the open end of the socket, there is provided a substantially U-shaped connection conductor which fixedly claws into the head member by means of retaining or holding flaps provided at a web portion of the U-shaped connection conductor. The legs of the U-shaped connection conductor extend from the web portion of the U-shaped connection conductor at an inclination inwardly at a predetermined location towards the lengthwise axis of the fuse holder to an internal contact location for a first cap member of the fuse insert or fuse.

Abstract: A bayonet connection between two electrically conductive components, especially for fuse holders, wherein at least one connection component possesses an electrically conductive spring which is electrically conductively connected with the one connection component. This spring, when there is established a connection between the connection components, electrically conductively contacts the second connection component.