Importance

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Abstract

The present invention provides an assembly for dispensing a lubricant. The assembly comprises a housing with a cavity and a nozzle member connected to the housing. The housing further includes a lubricant passage connectable to a source of pressurized lubricant and a fluid pressure inlet passage connected to a source of fluid pressure. The assembly further includes a piston member having a predetermined configuration with a first side in fluid communication with the fluid pressure passage and a second side and having a piston cavity formed within. There is a first bore extending through the piston. A retainer member is connected to such first side of the piston member. A valve device is biased by an urging device against the first bore preventing grease from exiting. Another urging device biases the piston to such closed position. A push rod is disposed within the first bore and extends a predetermined distance beyond an end of the second side of the piston. When fluid pressure enters the cavity, it forces the piston to the left and the urging device forces the ball valve and the push rod to the left until the push rod contacts resistance. The piston member continues to move to the left for such predetermined distance until it also contacts resistance. The push rod thereby preventing the valve device from pressing against the piston bore and thus permits grease to flow. Grease passes through a second bore, is mixed with fluid pressure and is expelled as a spray from the nozzle member.

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First Claim