Abstract: A pool brush assembly includes a main brush body and a replaceable handle and brush head arrangement. The main brush body includes an elongated brush frame having a first end and a second end and a plurality of brush elements outwardly extended from a brushing side thereof. The replaceable handle and brush head arrangement includes a connecting dock provided between the first end and the second end, a handle frame detachably connected to the connecting dock for detachably connecting with a handle bar, at least one end connector configured at one of the first end and the second end of the main brush body, and at least one brush head configured to be detachably connected to the at least one end connector, wherein the at one brush head comprises a connector joint and a plurality of end brush elements outwardly extended therefrom.

Abstract: A spatial large-stroke compliant hinge with hybrid structure, which includes a rectangular planar unit for implementing an out-of-plane torsion function and a crossed-shaped planar unit for achieving an in-plane rotation function. The crossed-shaped planar unit is formed by two flexible straight beam thin sheets intersecting into a crossed-shaped structure with an angle, and the rectangular planar unit and the crossed-shaped planar unit are connected through an external connection or an embedded connection.

Abstract: A multistable compliant mechanism is formed by connecting sequentially multiple basic units front to end to form a closed annular structure. Each basic unit includes two flexible hinges perpendicular to each other on different planes and two rigid connection parts for connecting the flexible hinges. The two flexible hinges are connected by a rigid connection part, and one of the flexible hinges is connected to a flexible hinge of an adjacent basic unit through the other rigid connection part. Lengths of two rigid connection parts in a same basic unit are equal, but lengths of rigid connection parts of different basic units are not necessarily equal. The multistable compliant mechanism features the continuous rotation and multi-steady state of a tri-compliant mechanism. The multistable compliant mechanism also features variable mechanism topology, an adjustable unit number, easy implementation, and promotion. A method for steady state analysis of the multistable compliant mechanism is also provided.

Abstract: A swimming pool chemical dispenser includes a main body having an accommodating cavity formed therein for storing chemical tablets, an upper cover which covers the upper opening of the main body, and a tablet clamp having a clamping end penetrating downward through the upper cover and abutting against the chemical tablets. The tablet clamp is provided with scales. The tablet clamp descends along with the dissolution of the chemical tablets and the amount of residual chemical tablets can be visually and reliably determined from the scales on the tablet clamp for timely refill. The tablet clamp is placed on the main body, thus making it convenient for the user to replace the chemical tablets bare-handed without touching the chemical tablets, which is much safer and more environmentally friendly.

Abstract: The present invention discloses a swimming pool chemical dispenser, comprises a main body, an upper cover which covers the upper opening of the main body, an accommodating cavity for storing tablets is formed inside the main body; the swimming pool chemical dispenser further comprises a tablet clamp; the clamping end of the tablet clamp penetrates downward through the upper cover and abuts against the tablets, and the tablet clamp is provided with scales; the tablet clamp descends along with the dissolution of the tablets and displays the amount of residual chemical in the main body. The amount of residual chemical can be visually and reliably determined from the scales on the tablet clamp for timely refill; the tablet clamp is placed on the main body, thus makes it convenient for the user to replace the tablets bare-handed without touching the tablets, which is much safer and more environmentally friendly.

Abstract: The invention discloses a spatial large-stroke compliant hinge with hybrid structure, which includes a rectangular planar unit for implementing an out-of-plane torsion function and a crossed-shaped planar unit for achieving an in-plane rotation function. The crossed-shaped planar unit is formed by two flexible straight beam thin sheets intersecting into a crossed-shaped structure with an angle, and the rectangular planar unit and the crossed-shaped planar unit are connected through an external connection or an embedded connection. The invention overcomes the problems that existing planar structure compliant hinge can only be equivalent to a large-stroke low pair with single degree of freedom, and existing LEMs compliant mechanism is equivalent to compliant hinge with multiple degrees of freedom and with smaller overall strokes. It has the advantages of simple structure, easy processing, easy analysis and calculation, equivalent large stroke space, and multiple degrees of freedom flexibility.

Abstract: A multistable compliant mechanism is formed by connecting sequentially multiple basic units front to end to form a closed annular structure. Each basic unit includes two flexible hinges perpendicular to each other on different planes and two rigid connection parts for connecting the flexible hinges. The two flexible hinges are connected by a rigid connection part, and one of the flexible hinges is connected to a flexible hinge of an adjacent basic unit through the other rigid connection part. Lengths of two rigid connection parts in a same basic unit are equal, but lengths of rigid connection parts of different basic units are not necessarily equal. The multistable compliant mechanism features the continuous rotation and multi-steady state of a tri-compliant mechanism. The multistable compliant mechanism also features variable mechanism topology, an adjustable unit number, easy implementation, and promotion. A method for steady state analysis of the multistable compliant mechanism is also provided.