US2027170A - Doorcheck - Google Patents

Description

Jan. 7, 1936. M HE NGWAY 2,027,170 7 I DooRcHEecK Filed May 20, 1935 Patented Jan. 7, 1936.

UNITED STATES PATENT OFFICE 1 Claim.

Fig. 1 is a front view of a door-check constructed in accordance with this invention and shown as applied to adoor;

Fig. 2 is a vertical sectional view on an enlarged 15 scale;

Fig. 3 is a sectional view on the line 3--3 of Fig. 2;

Fig. 4 is a sectional view on the line 4-4 of Fig. 2; and

20 Fig. 5 is a perspective view of the piston, de-

tached.

In carrying out this invention, a shell I is employed, which is provided with a bracket II, by which it may be attached to a door. In the shell 25 is a cup-shaped piston I2 having a port I3 in the bottom, which is normally closed by a spring valve I4. In one side is a vertical slot I and in the opposite side is an opening I 6, and from the opening I6 a by-pass I1 extends to the bottom of 30 the piston. The piston is supported in its downward position by a boss I8 formed in the bottom of the shell I 0. Mounted in the shell, in line with the by-pass, is a screw 36 having a pointed end 31 extending into the by-pass.

Mounted upon a pin I9 attached to the piston is a roller 20, and entered into the back of the shell is a screw-plug 2! having a reduced end 22 which extends into the slot I5 in the piston and 40 carries a roller 23.

The top of the shell is closed by a cap 24 and extending upwardly through this cap is a stud 25 of an actuator 26, which corresponds in diameter to the internal diameter of the piston, and

45 this actuator is formed with a spiral groove 21 into which the pin I9 extends, so that the roller 20 thereon will travel when the actuator is turned,

as in the opening or closing of the door.

Afiixed to the stud 25 is an operating-arm 28, which is pivoted to an operating-arm 29, which, in turn, is pivoted toa bracket 30, in the usual manner of door-checks of this type.

Within the piston is a spring 3I bearing upon 55 the bottom of the piston and against the lower and not liable to become deranged.

end of the actuator, and this piston is filled with fluid 32.

Preferably, around the casing at the upper end is a spring 33, one end 34 of which enters a recess for it in the casing, while the other end 35 .is 5 hooked over the arm 28.

As shown in Fig. 2 of the drawing, the parts are in the positions they assume when the door is in its closed position. Opening the door moves the arm 28 so as to turn the stud 25 and rotate the actuator 26, causing the piston I2 to rise, this piston being held against rotation by the plug 2 I, and as the piston rises, the spring 3| is compressed and the fluid escapes through the port I3, the valve I4 yielding for free escape of the liquid, so that the liquid-passes into the bottom of the shell.

When the door is released, the expansion of the spring 3| will tend to force the piston downward, in which case the spring I4 closes the opening I3, 0 and the liquid is forced through the by-pass l1 and through the opening I6 into the piston. The area of this by-pass may be regulated by the screw 36, the downward movement of the piston rotating the actuator 26 and so moving the door to the closed position, and this movement is accelerated by the spring 33.

This invention thus provides, with few parts,

a door-check which will be positive in its action It will be understood by those skilled in' the art that this invention may assume varied physical forms without departing from the inventive concept and the invention, therefore, is not limited to the specific embodiments herein chosen for illustration.

I claim:

A door-check comprising a shell adapted to be mounted upon a door, a cup-shaped piston 40 closely fitting said shell and axially movable therein, said piston formed on one side with a longitudinal slot and on the opposite side with an opening. means to prevent the rotation of the piston, a Icy-pass intersecting said opening, a pin mounted in said piston opposite the slot, an actuator closely fitting said piston and formed with a spiral groove into which the said pin extends, said actuator being formed with a stud extending through the casing, arms connecting the stud with the door-casing, a spring seated in said piston and bearing against the lower end of the actuator so as to be depressed thereby, and a valve-opening in the bottom of the piston.

. MARCUS B. HEMINGWAY.

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