A system for quick connection between a female end piece provided with a U-shaped locking clip and a male end piece fitted therein, the wall of the female end piece having opposite slits through which the arms of the U-shaped locking clip protrude into the passage of the end piece and the wall of the male end piece having an outer groove lockably receiving the clip arms in a final fitted state of the male piece in the female piece, locked by the clip. Also included is a part forming a removable prestressing element for the clip with housing sites engaging the two free sections in a first resting configuration, and in at least a second prestressed configuration in which the arms are more separated than in the resting configuration but less than during the passage of the maximum outer section of the male end piece.

A push button release mechanism for coupling together two portions of a tool, such as pliers. The push button release mechanism can include a push button and one or more balls pushed in a radially-outward direction by geometry of the push button to pivotally couple the two portions together. The balls are normally pushed outward by an engagement portion. Depressing a push button head axially downward causes the balls to align with a receiving portion, which allows the balls to descend into the interior of the mechanism. The push button release mechanism is also threadably coupled with a threaded opening of one of the portions. The threaded opening can have deformed threads to increase the retention torque required to rotate the push button release mechanism.

A push button release mechanism for coupling together two portions of a tool, such as pliers. The push button release mechanism can include a push button and one or more balls pushed in a radially-outward direction by geometry of the push button to pivotally couple the two portions together. The balls are normally pushed outward by an engagement portion. Depressing a push button head axially downward causes the balls to align with a receiving portion, which allows the balls to descend into the interior of the mechanism. The push button release mechanism is also threadably coupled with a threaded opening of one of the portions. The threaded opening can have deformed threads to increase the retention torque required to rotate the push button release mechanism.

Circlip pliers comprise a first plier and a second plier. The first plier is provided with an external connection portion, an internal connection portion, and a pivot portion located between the external connection portion and the internal connection portion. The second plier is provided with an external connection portion, an internal connection portion, and a second pivot portion located between the second external connection portion and the second internal connection portion. The external connection portions are adapted to insert into grip holes in an external circlip. The internal connection portions are adapted to insert into grip holes in an internal circlip. The first and second pivot portions are pivotally connected with each other.

A snap ring pliers contain: a handle, a first clamper, a second clamper, two clamp feet, and an adjustment structure. The handle includes a connection column. The first clamper includes a first hollow fitting ring, a first arcuate section, a second arcuate section, and a first straight section. The second clamper includes a second hollow fitting ring, a third arcuate section, a fourth arcuate section, and a second straight section. A respective one clamp foot of the two clamp feet includes a shaft inserted into the first straight section or the second straight section. The adjustment structure includes a first post, a second post, a threaded rod, and a sleeve. A direction of a threaded section of the first threaded orifice is opposite to a direction of a threaded section of the second threaded orifice. The threaded rod has a first screwing section and a second screwing section.

An electric actuator has a housing, an electric motor mounted on the housing, a speed reduction mechanism, and a ball screw mechanism that converts the rotational motion of the electric motor to axial linear motion of a drive shaft. An annular groove is formed on an open end of the blind bore of the housing. The sleeve is axially immovably secured by a annular stopper ring fit into the annular groove. The stopper ring has one notch and a recess formed on its inner circumference near each of its two ends of the stopper ring. A contour of each recess has a circular arc portion and a flat portion. The circular arc portion has a predetermined radius of curvature. The flat portion tangentially extends from the circular arc portion. A width of the opening of the recess is smaller than a diameter of the circular arc portion.

An installation tool for a two-stage clip is described. The tool includes a base element and a plunger element. The base element can include a plunger installation cavity and a clip receiving cavity. At least a portion of the plunger element can be retainably engaged in base element. The plunger element can be movable within the base element between a retracted position and an extended position. In the extended position, a portion of the plunger element can extend into the clip receiving cavity.

A tool aligns a snap-ring with a sink-flange tailpiece of a garbage disposal, and is used to slide the ring up along the tailpiece outer surface to a groove. The tool expands the snap-ring, prior to installation on the tailpiece, by an expansion mechanism, to a diameter that is slightly larger than the outer diameter of the tailpiece. The tool receives a stack of conventional disposal components on the tool top end, so the user with one hand can raise the tool and the stack to the tailpiece, and the fingers and thumb of the one hand can push the expanded snap-ring upward to reach and snap into the groove. The expansion mechanism may be a tapered tool bottom end, an expander tab, and/or an adaptation wherein the tool is reduced in diameter to fit inside a relaxed snap-ring and then increased in diameter to expand the snap-ring.

A tool aligns a snap-ring with a sink-flange tailpiece of a garbage disposal, and is used to slide the ring up along the tailpiece outer surface to a groove. The tool expands the snap-ring, prior to installation on the tailpiece, by an expansion mechanism, to a diameter that is slightly larger than the outer diameter of the tailpiece. The tool receives a stack of conventional disposal components on the tool top end, so the user with one hand can raise the tool and the stack to the tailpiece, and the fingers and thumb of the one hand can push the expanded snap-ring upward to reach and snap into the groove. The expansion mechanism may be a tapered tool bottom end, an expander tab, and/or an adaptation wherein the tool is reduced in diameter to fit inside a relaxed snap-ring and then increased in diameter to expand the snap-ring.

A plier assembly comprising first and second handle assemblies each comprising a frame assembly, a support block, a tip assembly, a proximal pin, and a distal pin. A main hinge assembly supports the second handle assembly for movement relative to the first handle assembly. The proximal openings are sized and dimensioned such that, as the second handle assembly moves relative to the first handle assembly, longitudinal axes of the support block are substantially parallel.