The pool water level and vacuum monitor is a device that is adapted to be seated on a pool deck adjacent to a swimming pool, and which monitors water level when filling a pool liner whilst a vacuum is removing air from behind a pool liner and a concrete wall of a pool. Moreover, the pool water level and vacuum monitor includes a telescoping armature that extends aside of a housing. The telescoping armature includes a cord and a float member on a distal end of the cord. The float member is adapted to rest on a pool surface of the swimming pool, and moves to close a float switch integrated in the float member. The float switch is able to turn off all circuitry associated within the housing.

A contact has a flat surface and a side surface that is parallel to the flat surface. At least a part of the side surface is curved so as to swell. At least a part of the contact is able to be elastically deformed in parallel to the flat surface.

A stud assembly is assembled by inserting a sphere into a cavity of a stud, where the cavity is cylindrical in shape, inserting a neck of a rivet into the cavity until the neck touches the sphere, and press-fitting the rivet into the cavity until the neck melds with the sphere.

A rivet-type contact of the present invention has a head part made of a contact material, and a leg part narrower than the head part in width and configured to be deformed at fixation. The leg part includes a flange part larger than the leg part in diameter, in an end part of the side of the head part, the flange part is embedded in the head part such that a lower end surface of the flange part and a lower end surface of the head part become approximately flat, and a length (l) between an endmost part of the flange part and a starting point of the leg part satisfies l<L with respect to a length (L) between an endmost part of the head part and the starting point of the leg part. Specifically, it is favorable that l satisfies 0.5 L≤l≤0.9 L with respect to L.

The present invention is a clad material for an electric contact, including a base material composed of a Cu-based, precipitation-type age-hardening material, and a contact material composed of an Ag alloy bonded to the base material. On a bonded interface between the contact material and the base material, a width of a diffusion region including Ag and Cu is 2.0 μm or shorter. The clad material is produced by bonding each other the contact material and the base material having undergone solutionizing and age-hardening beforehand, suppressing the diffusion region from expanding after bonding. The present invention is capable of providing an electric contact, which achieves higher conductivity, without sacrificing property of the Cu-based, precipitation-type age-hardening material.

A rivet-type contact of the present invention has a head part made of a contact material, and a leg part narrower than the head part in width and configured to be deformed at fixation. The leg part includes a flange part larger than the leg part in diameter, in an end part of the side of the head part, the flange part is embedded in the head part such that a lower end surface of the flange part and a lower end surface of the head part become approximately flat, and a length (l) between an endmost part of the flange part and a starting point of the leg part satisfies l<L with respect to a length (L) between an endmost part of the head part and the starting point of the leg part. Specifically, it is favorable that l satisfies 0.5Ll0.9 L with respect to L.

A screw includes a barrel-shaped central pin is surrounded by a cylindrical bore having a conical bottom The cylindrical insert is seated in the cylindrical bore. The top surface of the central pin is lowered below the top surface of the head. The walls of the pin (4) are convex towards the insert. Manufacturing the screw includes producing the threaded part with the head with the cylindrical recess with the cone-shaped bottom. The cylindrical insert terminates at one end with a bevel with an inclination angle of =10-30. The insert is introduced into the cylindrical recess. The upper part of the insert protruding from head of the screw is pre-shaped. The pin is upset using an appropriate tool and simultaneously the top surface of the pin is lowered below the top surface of the head.

A rivet-type contact of the present invention has a head part made of a contact material, and a leg part narrower than the head part in width and configured to be deformed at fixation. The leg part includes a flange part larger than the leg part in diameter, in an end part of the side of the head part, the flange part is embedded in the head part such that a lower end surface of the flange part and a lower end surface of the head part become approximately flat, and a length (l) between an endmost part of the flange part and a starting point of the leg part satisfies l<L with respect to a length (L) between an endmost part of the head part and the starting point of the leg part. Specifically, it is favorable that l satisfies 0.5Ll0.9L with respect to L.

An electrical contact assembly including an elongate stud having a coupling end and an opposing butt end, the butt end having a recess formed therein, the recess having a head portion and a shank portion defining a shoulder at a juncture therebetween, the head portion bounded by a collar and having a diameter that is larger than a diameter of the shank portion, and a contact pad having a head and a shank, the head having a top surface and a bottom surface with a tapered sidewall extending therebetween, the shank extending from the bottom surface of the head and having a diameter that is smaller than a diameter of the bottom surface, wherein the contact pad is disposed within the recess with the bottom surface of the head disposed on the shoulder and with the collar extending over and engaging the angled sidewall of the head.

The present invention is a clad material for an electric contact, including a base material composed of a Cu-based, precipitation-type age-hardening material, and a contact material composed of an Ag alloy bonded to the base material. On a bonded interface between the contact material and the base material, a width of a diffusion region including Ag and Cu is 2.0 m or shorter. The clad material is produced by bonding each other the contact material and the base material having undergone solutionizing and age-hardening beforehand, suppressing the diffusion region from expanding after bonding. The present invention is capable of providing an electric contact, which achieves higher conductivity, without sacrificing property of the Cu-based, precipitation-type age-hardening material.