The disclosed apparatus, systems and methods relate to an improved extendable and rotatable shovel for use in various applications such as the shoveling of snow. Users can modify the shovel to accommodate their stature and personal preferences.

A structure (10) comprising two shell parts (20, 30) which are connected to each other with at least one snap connection (21), wherein the two shell parts comprise, on the inner side, mutually complementary male and female snap means (25, 35) configured to form a snap connection (21), and wherein the two shell parts have complementarily configured abutment faces that abut on each other when the male and female snap means are interconnected (25, 35); wherein the male and female snap means (25, 35) comprise an external spiral-shaped protrusion (24) configured on the male snap means, and a thereto complementarily configured, internal, spiral-shaped protrusion (34) configured on the female snap means; and wherein the external spiral-shaped protrusion (24) on the male snap means (25) is configured such that it engages with the internal spiral-shaped protrusion (34) on the female snap means (35); and that the structure (10) comprises rotation-preventive means configured such that the two shell parts are unable to rotate relative to each other when the male and female snap means are interconnected to form at least one snap connection (21).

A connector has at least one engagement ball that is movable between an engagement position and a disengagement position. A movement of an engagement ball operating part of the connector relative to an inner housing of the connector can force the at least one engagement ball from the engagement position into the disengagement position. The at least one engagement ball is biased in the engagement position by an elastic element via the engagement ball operating part. The connector further comprises an outer housing of the connector with a catch that when the outer housing is operated engages with a counter catch of the engagement ball operating part to move the engagement ball operating part, so that the engagement ball operating part forces the at least one engagement ball from the engagement position into the disengagement position.

A sacrificial mechanical link for linking a first mechanical element to a second mechanical element includes: a sacrificial element having a first end and a second end; and a first mechanical element removably connected to the first end of the sacrificial element. A method of using a sacrificial mechanical link includes: coupling a first mechanical element to a second mechanical element with a sacrificial element; and applying a force to a one of the first mechanical element and the second mechanical element to cause deformation of the sacrificial element.

A transfer system includes a first mechanical element including a portion of a one of a support platform and a transfer device; a second mechanical element including a portion of a one of the support platform and the transfer device; and a sacrificial element including a first end, a second end, and a central portion, the second end removably connected to the first mechanical element with a first connecting fastener, and the first end removably connected to the second mechanical element with a second connecting fastener.

An angle bar includes two longitudinal angled plate portions, and a corner portion connecting therebetween. The corner portion has an inner corner surface bounding an inner corner space and an outer corner surface. A stopper protrudes into the indented corner space, and has an abutment face extending across the indented corner space. A limiter protrudes into the indented corner space from the inner corner surface, and has a through hole opening in a direction along a bending line of the corner portion. A modular post assembly has at least two angle bars abutting each other, and a fixing rod extending through the through holes of the bars along the bending line and limited between the stoppers for fixing together the bars.

An above ground frame pool (10) includes a frame assembly (20) and a liner (40) supported by the frame assembly (20). The frame assembly (20) includes a plurality of horizontal pipes (22), a plurality of vertical pipes (24), and a plurality of T-shaped joints (30). The joints (30) may lack mechanical fasteners with adjacent pipes or corresponding apertures. The joints (30) may be one-piece or multi-piece structures. Such joints (30) maybe water-resistant and convenient to manufacture, assemble, disassemble, and store.

A quick release assembly for a side roll tarp has a roll-tube coupler connected to a roll-tube for rolling and unrolling the side roll tarp. A drive coupler is connected to a shaft of a motor, the drive coupler fitting within an opening in the roll-tube coupler. The drive coupler has a first groove and second groove circumferentially around an exterior of a circular shaft below a head portion of the driver coupler. A quick release pin traverses through a pair of tangential openings in the body of the roll-tube coupler to engage the first or second grooves of the drive coupler, wherein the driver coupler is engaged with the roll-tube coupler when in the first groove allowing the motor to drive the roll-tube and disengaged from the roll-tube coupler when in the second groove allowing the roll-tube to be rotated independently of the motor.

An assembly includes a first and a second member, where the second member has a fork-shaped cross section with a main body and two substantially parallel walls that each comprise at least one through hole and the first member is arranged between the two walls of the second member, having a through hole. The through hole of the first member and the through holes of the second member define a channel. A connector is axially insertable in the channel to an end position and consecutively expandable radially relative to said channel, to connect the first and second member relative to each other. The connector, in an expanded state thereof, pushes the first member against the main body of the second member to define a pre-tensioned connection between the first member and the second member. A method of assembling a first and a second member.

The invention discloses a connecting mechanism of a dildo. One end of a driving mechanism connecting end is connected to one end of a connecting mechanism body, and the other end of driving mechanism connecting end is provided with a driving mechanism connecting member. One end of a dildo connecting end is provided with a dildo connecting member, and the other end of the dildo connecting end is connected to the other end of the connecting mechanism body. The other end of the dildo connecting end is provided with a connecting column, the inside of the other end of the connecting mechanism body is provided with an internal connecting cavity matched with the connecting column, and the connecting column is inserted into the internal connecting cavity. A concave limiting groove is formed in the connecting column circumferentially, a limiting member embedding groove communicated with the internal connecting cavity is formed in an outer wall of the connecting mechanism body, and a limiting member is embedded in the limiting member embedding groove. An outer sleeve is sleeved over the outside of the connecting mechanism body, a protrusion I is arranged at an inner wall of the outer sleeve, and when the protrusion I corresponds to the limiting member embedding groove in position, the protrusion I exerts a pressure on the limiting member. The invention helps to solve the problem of easy separation of a dildo and a driving mechanism.