Door check

Claim 1

A door check comprising a casing, a pivot pin for a door journaled in the casing, the pin and door being engageable together for the transmission of torque between the two, a cam affixed to the pin, a lever journaled in the casing, a follower arranged on the lever for engagement with the cam, resilient means engaged between the casing and lever stressing the follower against the cam, means defining an enclosure fixed with respect to the casing, said enclosure having a cylindrical portion, a piston slideable within said cylindrical portion, a link coupling the piston to the lever, a cavity communicating with one end of said cylindrical portion, and means defining an orifice through the wall of said cavity in said enclosure, said orifice having a cross-section whose maximum dimension is greater than the length of said orifice, said orifice-defining means comprising a hollow cylindrical plug disposed in the wall of said enclosure substantially parallel with said wall, said plug having aligned apertures through the walls thereof giving access between the interior and exterior of said enclosure, each of said apertures having a cross-section whose maximum dimension is greater than the thickness of the walls of said plug, said orifice-defining means further comprising a cylindrical closure member adjustable lengthwise within said plug for adjustable partial obturation of said apertures, said closure member having a concavity in the end thereof adjacent said apertures whereby the said end of said closure member constitutes a blade for partial obturation of said apertures.