Abstract: The present invention is an instantaneous water heating unit for retrofitting hot water storage tank. The instantaneous water heating unit is used to replace the original flange of an existing water storage tank.

Abstract: There is provided a tool for repair of damaged threads of screws, including a body (2) having a projecting portion (4) for accommodating a screw to be repaired and having two recessed major surfaces; a cutting blade (6), having a rear end hingedly articulated to the body (2), and a front end in the shape of a cutting face (46) substantially fitting the type of thread to be repaired; a guide blade (7) having a rear end hingedly articulated to the body (2), and a front end substantially fitting the type of thread to be repaired, the guide blade projecting beyond the cutting face of the cutting blade, and; means (10, 12, 14) to alter the distance between the front ends and the projecting body portion (4) to accommodate screws of different diameters.

Abstract: There is provided a tool for repair of damaged threads of screws, including a body (2) having a projecting portion (4) for accommodating a screw to be repaired and having two recessed major surfaces; two blades (6, 6?), each having a rear end (32, 32?) hingedly articulated in the body (2) and front end in the shape of a cutting face (46, 46?) substantially fitting the type of thread to be repaired: means (10, 12) to alter the distance between the cutting faces (46, 46?) and the projecting portion (4) to accommodate screws of different diameters, and wherein the rear ends (32, 32?) of the blades (6, 6?) are configured in such a way that they are capable of serving as pivots, whereby the blades (6, 6?) are hingedly articulated to the body (2).

Abstract: There is provided a tool for repair of damaged threads of screws, including a body (2) having a projecting portion (4) for accommodating a screw to be repaired and having two recessed major surfaces; a cutting blade (6), having a rear end hingedly articulated to the body (2), and a front end in the shape of a cutting face (46) substantially fitting the type of thread to be repaired; a guide blade (7) having a rear end hingedly articulated to the body (2), and a front end substantially fitting the type of thread to be repaired, the guide blade projecting beyond the cutting face of the cutting blade, and; means (10, 12, 14) to alter the distance between the front ends and the projecting body portion (4) to accommodate screws of different diameters.

Abstract: There is provided a tool for repair of damaged threads of screws, including a body (2) having a projecting portion (4) for accommodating a screw to be repaired and having two recessed major surfaces; two blades (6, 6?), each having a rear end (32, 32?) hingedly articulated in the body (2) and front end in the shape of a cutting face (46, 46?) substantially fitting the type of thread to be repaired: means (10, 12) to alter the distance between the cutting faces (46, 46?) and the projecting portion (4) to accommodate screws of different diameters, and wherein the rear ends (32, 32?) of the blades (6, 6?) are configured in such a way that they are capable of serving as pivots, whereby the blades (6, 6?) are hingedly articulated to the body (2).

Abstract: There is provided an attachment for a spark erosion machine having a working head, the attachment including a top part fixedly attachable to the working head, a body suspended from, and moveable relative to, the top part with one degree of freedom in translation, a guide for guiding the body in the translational movement and a main shaft mounted in the body and rotatable about an axis parallel to the translational movement. There is also provided a driver for imparting the main shaft a rotational movement, a drive pin having an axis parallel to the axis of the main shaft and rotatably connected thereto by an adjustable connector adapted to connect the drive pin to the main shaft in a plurality of positions between a first limit position of coaxiality and a second limit position of maximal eccentricity relative to the main shaft.

Abstract: The invention provides a hand-wrestling training device, comprising an elongated main base carrying at one of its ends a mounting means to which one end of a spring means is hingedly articulated; at least one mounting plate fixedly attached to the main base near the other end of the base; a head unit pivotably mounted in the mounting plate; a pusher arm fixedly attached at one of its ends to the head unit and provided with a plate element at the other one of its ends; a body movable in translation along the pusher arm, the second end of the spring means being articulated to the body; adjustment means for altering the mechanical advantage afforded to the user by moving the body along the pusher arm, thereby altering the effective length of the pusher arm, and a gripping handle hingedly attached to a portion of the head unit; the gripping handle, when turned downward, causing the pusher arm to be applied against the opposing force of the spring.

Abstract: The invention provides a chasing tool for repairing damaged internal threads, including a body provided with a bore; a handle retained in the bore with one degree of freedom in rotation, the handle being provided over at least part of its length with an internal thread; a cylindrical component having an external thread matching the internal thread of the handle; a tubular member fixedly attached to the body perpendicular to the axis of rotation of the handle and opening into the bore of the body and a lever tiltable about a pivot providing the lever with one degree of freedom in rotation, the cylindrical component being articulated to the lever and a cutter articulated to the other end of the lever, the cutter projecting from the tubular member.

Abstract: The invention provides a hand-wrestling training device, comprising an elongated main base carrying at one of its ends a mounting means to which one end of a spring means is hingedly articulated; at least one mounting plate fixedly attached to the main base near the other end of the base; a head unit pivotably mounted in the mounting plate; a pusher arm fixedly attached at one of its ends to the head unit and provided with a plate element at the other one of its ends; a body movable in translation along the pusher arm, the second end of the spring means being articulated to the body; adjustment means for altering the mechanical advantage afforded to the user by moving the body along the pusher arm, thereby altering the effective length of the pusher arm, and a gripping handle hingedly attached to a portion of the head unit; the gripping handle, when turned downward, causing the pusher arm to be applied against the opposing force of the spring.

Abstract: A liquid pressure booster includes a head member with a low-pressure inlet connectable to a liquid source at mains pressure, a high-pressure outlet connectable to the object to be tested, and a central bore, a compound cylinder constituted by a first, upper, relatively small-diameter portion fluid-tightly attached to the head member and a second, lower, relatively large-diameter portion contiguous with the upper portion and closed off at its lower end by a bottom plate having a drain opening.