Abstract: A concealed adjustable temperature switch includes a fixed plate, an adjusting block threadedly engaged with a screw hole of the fixed plate, a bimetal plate, and a metal plate. Mounted on the adjusting block are upper and lower positioning rings and a fixing ring between the positioning rings. The fixed ring includes a hole through which the adjusting block extends. The fixing ring includes a stop projecting toward the fixed plate. The stop includes two sides having a height greater than a thickness of the fixed plate. A distance between the stop and a center of the hole of the fixing ring is greater than that between a front edge of the fixed plate and a center of the screw hole of the fixed plate and than that between either one of two sides of the fixed plate to the center of the screw hole of the fixed plate.

Abstract: An adjustable temperature switch includes a temperature-adjusting device. The temperature-adjusting device includes a rotatable adjusting block and a knob engaged with the rotatable adjusting block. The knob includes an end face with a plurality of partitions separated by a plurality of partitioning ribs. A resilient member includes a first end fixed to the temperature-adjusting device and a hooked second end retained in one of the partitions.

Abstract: A dental X-ray image sensor provided with a cross mark that is opaque to radio waves on the corner of a digital radiography sensor surface renders a computer program to recognize true dimension and to rescale any distortion due to angulational position error in a conventional X-ray digital radiograph system.

Abstract: A hot melt glue gun includes a barrel, an inner tube, and an outer tube. A glue stick is guided through the barrel. The inner tube includes an end mounted around an open end of the barrel. The inner tube is made of tackfree silicon rubber and includes an inner periphery that is in contact with a circumference of the glue stick passing therethrough. The outer tube is made of Teflon and securely mounted around the inner tube and the open end of the barrel. The outer tube includes an inner diameter greater than that of the inner tube such that the circumference of the glue stick is not in contact with an inner periphery of the outer tube, preventing the glue stick from being adhered to the inner periphery of the outer tube.

Abstract: A concealed adjustable temperature switch is electrically connected to a heating member. The concealed adjustable temperature switch includes a fixed plate with a screw hole, an adjusting block having an outer threading threadedly engaged with the screw hole of the fixed plate, a bimetal plate that has different bending extents at different temperatures, and a metal plate. A positioning ring is securely mounted on the adjusting block to turn therewith. Two spaced stops are provided to stop a projection of the positioning ring, thereby limiting turning of the adjusting block.

Abstract: A ratchet wrench has a ratchet head, a handle having an end recess receiving the ratchet head, and a sleeve receiving the handle. A pivot pin fastens the ratchet head and the handle. A retainer ring which surrounds the sleeve has an eccentric hole. The handle has a first blind hole receiving a first spring and a first positioning ball, a second blind hole receiving a second spring and a first positioning pin, a recess hole receiving a second positioning ball, a first groove receiving a compression spring, a spherical ball, and a block, and a second groove receiving a shaft. The shaft has a positioning recess and a slant recess. The block has a bevel end and a recess aperture receiving a coiled spring and a steel ball. The sleeve has a slant groove, an oblong hole receiving a pressing pin, and a through aperture.

Abstract: A sleeve tool kit has a tool box, a recess interior formed in the tool box, and a block seat inserted in the recess interior. The block seat has two opposite balls and a plurality of positioning protrusions. The tool box has two opposite ball-shaped grooves, two opposite round holes, two opposite guide grooves, and two opposite toothed semicircular grooves. The opposite ball-shaped grooves are formed on two opposite ends of the recess interior. The opposite round holes are formed on the opposite ends of the recess interior. The opposite guide grooves are formed on the opposite ends of the recess interior. The opposite toothed semicircular grooves are formed on the opposite ends of the recess interior. Each opposite ball is inserted in the respective opposite ball-shaped groove via the respective opposite round hole and the respective opposite guide groove.

Abstract: A glue gun having a structure for pushing a glue stick inserted in a hollow passage in a pushing base, provided with a pushing block to be moved by movement of a trigger, an arm and a connecting plate to push forward the glue stick together with the pushing base.