A fastener comprises a housing, a socket, a pintle and a locking feature. The housing includes a shaft, a central bore that extends axially at least partially through the housing and a ball lock aperture extending from the bore. The socket extends into the housing adjacent to the first end face, and is configured such that rotation of the first socket rotates the fastener. The pintle is positioned within the bore and includes an actuation end and a rod that extends axially from the actuation end. The rod includes a ball transitioning surface and a ball locking surface. The pintle is moveable axially within the bore between a designated lock position where the ball locking surface of the pintle is aligned in register with each ball lock aperture, and a designated unlocked position where the ball lock surface of the pintle is moved axially away from each ball lock aperture.

A pipe press-fit connecting apparatus includes a connecting device. The connecting device may be used to connect a connected unit to a pressing power providing unit. The connecting device includes a fastener and a coupling pin. The fastener is installed at one end of the installation hole on an exterior surface of a cylinder block and has a fastening pin configured to be resiliently arranged and at least partially be exposed to the installation hole. The coupling pin is inserted through the installation hole and the insertion hole through another end of the installation hole on the exterior surface of the cylinder block to be resiliently coupled to the fastening pin to couple the connected unit to the pressing power providing unit.

A pipe press-fit connecting apparatus includes a connecting device. The connecting device may be used to connect a connected unit to a pressing power providing unit. The connecting device includes a fastener and a coupling pin. The fastener is installed at one end of the installation hole on an exterior surface of a cylinder block and has a fastening pin configured to be resiliently arranged and at least partially be exposed to the installation hole. The coupling pin is inserted through the installation hole and the insertion hole through another end of the installation hole on the exterior surface of the cylinder block to be resiliently coupled to the fastening pin to couple the connected unit to the pressing power providing unit.

A releasable connection system for watercraft with first and second magnetic members configured to attract each other and releasably lock together through a male-female coupling mechanism. Watercraft can be connected to the first and second magnetic members through apertures with rope. A pivotable release arm releases the male-female coupling mechanism when rotated. Rope can attach to the pivotable release arm through an aperture. Connected watercraft can be released when a user remotely pulls a rope which rotates the pivotable release arm.

Quick-change system for a sweep comprising a sweep with a neck and a removable wedge, wherein the neck serves to couple the sweep to a cultivator shank and comprises an inner surface with at least one lug that fits in at least one hole of the cultivator shank, and side flaps configured to clasp the cultivator shank, the removable wedge being inserted between the side flaps and the cultivator shank and holding the cultivator shank against the inner surface of the neck, so that the combination of the lug fitted in the hole of the cultivator shank and the removable wedge inserted in the neck makes it possible to retain and fasten the sweep to the cultivator shank.

A quick release leash which includes a flexible leash line that terminates in a male member of a quick release coupling. The quick release coupling has a female receiver which receives the male member in mating relation. A locking pin passage that intersects the female receiver. The male member of the quick release coupling has an aperture. A locking pin is axially movable in the locking pin passage and is biased by a biasing member into engagement with the aperture of the male member. When a force is exerted upon a manual release sufficient to overcome the biasing force of biasing member, the first end of the locking pin is withdrawn from the aperture of the male member and the male member is released. This quick release leash was developed as a safety device for water sports to quickly release a person from their board, but has wider application.

A quick release leash which includes a flexible leash line that terminates in a male member of a quick release coupling. The quick release coupling has a female receiver which receives the male member in mating relation. A locking pin passage that intersects the female receiver. The male member of the quick release coupling has an aperture. A locking pin is axially movable in the locking pin passage and is biased by a biasing member into engagement with the aperture of the male member. When a force is exerted upon a manual release sufficient to overcome the biasing force of biasing member, the first end of the locking pin is withdrawn from the aperture of the male member and the male member is released. This quick release leash was developed as a safety device for water sports to quickly release a person from their board, but has wider application.

A closure device includes a first closure part which has a body, and a second closure part. A locking element and an engagement portion in a closing position are mutually engaged in such a manner that the first closure part and the second closure part arc locked to one another. The first closure part has a first magnetic installation, and the second closure part has a second magnetic installation, said first magnetic installation and said second magnetic installation when placing the first closure part and the second closure part against one another interact in a magnetically attractive manner. The at least one locking element is magnetically configured in such a manner that the at least one locking element in the closing position by way of the first magnetic installation and/or the second magnetic installation is loaded in the direction of engaging with the at least one engagement portion.

A closure device includes a first closure part which has a body, and a second closure part. A locking element and an engagement portion in a closing position are mutually engaged in such a manner that the first closure part and the second closure part arc locked to one another. The first closure part has a first magnetic installation, and the second closure part has a second magnetic installation, said first magnetic installation and said second magnetic installation when placing the first closure part and the second closure part against one another interact in a magnetically attractive manner. The at least one locking element is magnetically configured in such a manner that the at least one locking element in the closing position by way of the first magnetic installation and/or the second magnetic installation is loaded in the direction of engaging with the at least one engagement portion.

A quick release connecting assembly is provided. The quick release connecting assembly includes a first connector and a second connector, wherein the first connector includes an upper fixed plate, a middle portion of the upper fixed plate is connected to a connecting column, and a clamping slot is formed in a middle portion of the connecting column; and the second connector includes a lower fixed plate, a middle portion of the lower fixed plate is connected to a connecting pipe matched with the connecting column, a side surface of the connecting pipe is connected to a side pipe communicating with the connecting pipe, and a bolt column is arranged in the side pipe. The connecting column of the first connector and the bolt column of the second connector are clamped, such that the quick release connecting assembly is simple in integral structure and convenient to disassemble and assemble.