The present disclosure provides an electrostatic nozzle and a controllable jet minimal quantity lubrication (MQL) grinding system. The electrostatic nozzle comprises a nozzle core; an upper nozzle body is connected above the nozzle core; a free space is formed between the upper nozzle body and the nozzle core for storing compressed air and reducing pressure; a lower nozzle body is connected below the nozzle core; a gas-liquid mixing chamber, an acceleration chamber and a nozzle outlet are sequentially arranged inside the nozzle core from top to bottom; and micro-bulges are uniformly distributed on an inner wall of the acceleration chamber.

A sprinkler includes a body, a button, and a spring. The body includes an opening and a shoulder arranged around a sprinkler axis. The spring including an aperture that receives the button, a first spring surface, and a second spring surface. At least one of (i) the shoulder includes a first extension that contacts the first spring surface and (ii) the button includes a second extension that contacts the second spring surface.

A sprinkler includes a body, a button, and a spring. The body includes an opening and a shoulder arranged around a sprinkler axis. The spring including an aperture that receives the button, a first spring surface, and a second spring surface. At least one of (i) the shoulder includes a first extension that contacts the first spring surface and (ii) the button includes a second extension that contacts the second spring surface.

A low pressure washer nozzle tip is provided. The low pressure washer nozzle tip has an angled tip with multiple openings and a corresponding retaining nut. The nozzle tip is secured to the retaining nut and wherein both are removably secured to a shaft of a pressure washer gun. The tip of the nozzle is angled at approximately a one hundred to a one-hundred and five-degree axis with respect to a main shaft of the pressure washer.

A robotic vehicle (10) may include a chassis supporting a storage tank in which an aqueous solution is contained, a mobility assembly operably coupled to the chassis to provide mobility for the robotic vehicle about a service area (20), a positioning module (60) configured to provide guidance for the robotic vehicle (10) during transit of the robotic vehicle (10) over the service area (20), a spray assembly (90) and control circuitry (12).

A robotic vehicle (10) charging station (40) may include a charge interface configured to charge a battery (210) of a robotic vehicle (10) responsive to docking of the robotic vehicle (10) at the charging station (40), and a mixing assembly (240) configured to facilitate mixing a solid material and a liquid to form an aqueous solution for provision to a storage tank (14) of the robotic vehicle.

A fire suppression sprinkler adapted to receive arcuate surfaces of a grooved coupling is retainable to the coupling in a pre-assembled state. The coupling joins the sprinkler in facing axial end to end relation directly to grooved pipe. The sprinkler has a monolithic body which defines a bore having an inlet and an outlet. A groove, positioned between the inlet and the outlet extends around the body. A projection, positioned between the groove and the outlet also extends around the body.

A fire suppression sprinkler adapted to receive arcuate surfaces of a grooved coupling is retainable to the coupling in a pre-assembled state. The coupling joins the sprinkler in facing axial end to end relation directly to grooved pipe. The sprinkler has a monolithic body which defines a bore having an inlet and an outlet. A groove, positioned between the inlet and the outlet extends around the body. A projection, positioned between the groove and the outlet also extends around the body.

A robotic fountain is proposed. The robotic fountain includes: a water supply pipe rotating while passing through upper and lower surfaces of a main body of the fountain; a fastening part formed between the lower surface of the main body and a lower end of the water supply pipe; a first motor configured to rotate the water supply pipe; a support part formed between the upper surface of the main body and an upper end of the water supply pipe; a bypass body fastened to the top of the water supply pipe; a through hole formed through one side of a lower surface of a rotary body, the rotary body fastened to an upper surface of the bypass body; an intermediate pipe configured to rotate inside the rotary body; a second motor for rotating the intermediate pipe; and a nozzle formed at the center of the intermediate pipe.

A robotic fountain is proposed. The robotic fountain includes: a water supply pipe rotating while passing through upper and lower surfaces of a main body of the fountain; a fastening part formed between the lower surface of the main body and a lower end of the water supply pipe; a first motor configured to rotate the water supply pipe; a support part formed between the upper surface of the main body and an upper end of the water supply pipe; a bypass body fastened to the top of the water supply pipe; a through hole formed through one side of a lower surface of a rotary body, the rotary body fastened to an upper surface of the bypass body; an intermediate pipe configured to rotate inside the rotary body; a second motor for rotating the intermediate pipe; and a nozzle formed at the center of the intermediate pipe.