Abstract: A joint for a swimming pool frame, and a swimming pool including the joint are provided. The joint includes a joint body including a leg pipe holder configured to have a leg pipe of the swimming pool frame inserted into the leg pipe holder. The joint also includes a side pipe holder configured to have a side pipe of the swimming pool frame inserted in the side pipe holder. A locking hole is formed through the side pipe holder. The joint body also includes a locking part including a locking pin configured to extend through the locking hole and through a corresponding connecting hole in the side pipe, thereby holding the side pipe to the side pipe holder.

Abstract: A tool comprises a housing, an electric motor positioned in the housing, and a drive assembly including an output shaft having a driving end portion. The output shaft extends from the housing such that a tool element for performing work on a workpiece is attachable to the output shaft. A retainer assembly is positioned about an outer surface of the driving end portion. The retainer assembly has a proximal end adjacent to the housing.

Abstract: The present application provides a battery cell, a battery, and an electrical apparatus. The battery cell may comprise a case, a cover plate, and a pressure relief apparatus. The case may have an opening; the cover plate may cover the opening, and the cover plate may be welded with the case to form a welding seam; the pressure relief apparatus may be disposed on the cover plate, the pressure relief apparatus may be provided with a weak region, the weak region may be configured to be broken to release internal pressure when the internal pressure or temperature of the battery cell reaches a threshold, and the minimum distance between the edge of the weak region and the welding seam may be greater than or equal to 3 mm.

Abstract: A directional and timing control circuit is provided. the circuit includes a main control chip, a power supply module to supply power to the main control chip, a driver module configured to receive a control command from the main control chip and to control a motor according to the control command, a Hall module configured to detect an operation direction of the motor and transmit an operation direction signal to the main control chip, and a zero-crossing detection module configured to detect a zero-crossing cycle of the alternating current power supply to thereby obtain a current utility frequency of the alternating current power supply as a timing frequency of the main control chip, the zero-crossing detection module including an input terminal connected to the alternating current power supply and an output terminal connected to a phase detection terminal of the main control chip.

Abstract: A joint for a swimming pool frame, and a swimming pool including the joint are provided. The joint includes a joint body including a leg pipe holder configured to have a leg pipe of the swimming pool frame inserted into the leg pipe holder. The joint also includes a side pipe holder configured to have a side pipe of the swimming pool frame inserted in the side pipe holder. A locking hole is formed through the side pipe holder. The joint body also includes a locking part including a locking pin configured to extend through the locking hole and through a corresponding connecting hole in the side pipe, thereby holding the side pipe to the side pipe holder.

Abstract: An impact tool includes a housing, an anvil extending from the housing, a tool element removably coupled to the anvil, a drive assembly to impart rotational impacts to the anvil, and a detent system supported by the anvil. The detent system includes a detent pin defining a longitudinal center axis and having a notch disposed on only one side of a longitudinal mid-plane containing the longitudinal center axis, and a retaining pin received within the notch. The detent pin is movable relative to the anvil between an extended position and a retracted position, the detent pin is configured to engage the tool element to retain the tool element on the anvil when the detent pin is in the extended position, the detent pin is biased toward the extended position, and the retaining pin engages an end of the notch to limit movement of the detent pin to the extended position.

Abstract: A directional and timing control circuit is provided. the circuit includes a main control chip, a power supply module to supply power to the main control chip, a driver module configured to receive a control command from the main control chip and to control a motor according to the control command, a Hall module configured to detect an operation direction of the motor and transmit an operation direction signal to the main control chip, and a zero-crossing detection module configured to detect a zero-crossing cycle of the alternating current power supply to thereby obtain a current utility frequency of the alternating current power supply as a timing frequency of the main control chip, the zero-crossing detection module including an input terminal connected to the alternating current power supply and an output terminal connected to a phase detection terminal of the main control chip.

Abstract: A joint for a swimming pool frame, and a swimming pool including the joint are provided. The joint includes a joint body including a leg pipe holder configured to have a leg pipe of the swimming pool frame inserted into the leg pipe holder. The joint also includes a side pipe holder configured to have a side pipe of the swimming pool frame inserted in the side pipe holder. A locking hole is formed through the side pipe holder. The joint body also includes a locking part including a locking pin configured to extend through the locking hole and through a corresponding connecting hole in the side pipe, thereby holding the side pipe to the side pipe holder.

Abstract: Disclosed herein are synthetic methods and compounds related to the compounds that are useful as or in the production of biologically active compounds. Stereoselective and stereospecific synthetic methods are disclosed to produce compounds, such as, for example, ?,?-unsaturated-?-hydroxyesters and aminated derivatives thereof, at high yields with desired stereochemistry. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

Abstract: Disclosed herein are synthetic methods and compounds related to the compounds that are useful as or in the production of biologically active compounds. Stereoselective and stereospecific synthetic methods are disclosed to produce compounds, such as, for example, ?,?-unsaturated-?-hydroxyesters and aminated derivatives thereof, at high yields with desired stereochemistry. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.