Cap, reservoir and dropper assembly for bottles

Claim 1

A cap, reservoir and dispensing dropper assembly for a bottle comprising: a reservoir having a first end portion adapted to fit within the opening in a bottle and having a second end forming a collar adapted to rest on the mouth of the bottle, the first end of the reservoir being closed by a closure wall and the second end being open; a hollow piston slidably fitted in the open end of the reservoir, the piston having a first end adapted to cut said closure wall when forced against the latter and having a second end fitted with a dropper; a cap having a side wall adapted to releasably connect with the exterior of the neck of the bottle and an imperforate end wall which overlies the second end of said piston, whereby said dropper is protected from contamination when said assembly is connected to the bottle by said cap; said second end of said piston including a circumferential collar; said side wall of said cap being internally threaded so as to be threadedly engaged with external threads on a bottle neck; and said cap having an internal surface which, upon screwing of said cap on to the bottle a predetermined distance, engages said piston collar and forces the piston in a direction to cut said closure wall, the arrangement being such that further tightening of said cap forces said piston collar into sealing engagement with said reservoir collar.