US1140321A - Door-check. - Google Patents

Description

D. E. WILLARD.

DOOR CHECK.

APPLICATION FILED MAR. 22, I915- zgmma m. Patented May 18,1915.

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DONALD E. WILLARD, 0F DANVILLE, ILLINOIS.

DOOR-CHECK.

Specification of Letters Patent.

Patented May 18, 1915..

Application filed March 22, 1915. Serial No. 16,017.

To alt whom it may concern 7 Be it known that I, DONALD E. WILLARD,

a citizen of the United States, and resident of Danville, in the county of Vermilion and State of Illinois, have invented certain new and useful Improvements in Door-Checks, of which the following is a specification. v My invention relates to door checks, and has particular reference to an improvement on the construction shown and described in my co-pending application, Serial No. 84l5,131.

The object in the construction of the present check is to provide means whereby it will be impossible for the entire elimination of the checking effect under any circumstances.

It is not uncommon, under certain conditions, for a user to adjust the control valve, then, when the conditions have changed, to find that the door will be closed with much force and the glass broken. If the door is arranged to be closed without wind pressure and an unusual condition should arise in which the wind is directed against the door, the closing action would occur with considerable force. I have obviated any such possibility in the present construction, the arrangement being such that under no possible adjustment of the valve will the door be permitted to close without such checking eflect as will obviate the possibility of break age. This means which I have provided will not interfere with the usual operation of the check and acts simply as a safety feature.

The invention will be more readily understood by reference to the accompanying drawing, in which:

Figure 1 is a longitudinal section through a door check constructed in accordance with my invention, Fig. 2 is a fragmentary view similar to Fig. 1 showing the piston in such position that the escape of liquid from one side of the piston to the other is momentarily checked, and Fig. 3 is a section on the line 33 of Fig. 1. v

Referring more particularly to the drawings, it will be seen that I provide a casing or cylinder 10 having a bypass 11 therein, the openings to the bypass consisting in the ports 12, 13. The by-pass is controlled by a valve 14. Mounted within the casing is a transverse shaft 15 having a bearing in the threaded plugs 16. Secured to the shaft are arms 17 18, 19, of different lengths, the intermediate arm 18 being shorter than the arm 17 and no longer than the arm 19. These arms cooperate with notches 20, 21, 22 in a rack 23, which acts also as the stem of a piston 24. A coil spring 25 surrounds the stem and bears against the piston, the spring finding a bearing at its opposite end on a Wall 26, formed as a part of a shell 27, which is fitted within the casing and acts as a guide for the rear end of the stem or rack 23. This shell is held in place by means of a nut 28, the cylinder being closed by the cap 29. A rod 30 projects from end to end of the cylinder on the interior thereof, such rod, as best shown in Figs. 1 and 2 having a portion between the points 31, 32 which is of reduced diameter and is tapered, the greatest depth of the reduced portion being at the point 31, the depth being lessened to the point 32 where the rod resumes its normal diameter. This rod extends through an aperture 32 in the piston and fits such opening closely at the point where the rod is of its normal diameter. However, when the piston is in a position between the points 31, 32 the checking liquid will escape around the reduced portion of the rod. Likewise, after the piston passes the port 13, liquid will escape through the bypass 11, as permitted by the valve 14. However, it will be seen, upon reference to Fig. 2 that there is a point at which the passage through the piston and the port 13 are both closed and that the escape of liquid is momentarily stopped. Due to the slight leakage at the different points, such as around the piston, through the check valve 33, etc., this checking effect, due to the closing of all of the escape apertures, will be only momentarily, the normal action being resumed after the piston opens a portion of the port 13.

It is believed the construction here described will be found of importance, in that it provides against damage due to unskilled manipulation of the valve 14:. The location of the port 13 and the end of the taper 32 on the rod will be fixed according to diiferent designs, it being desirable, however, that these two points should be fixed in order that the door cannot acquire a great momentum after the checking efi'ect secured thereby is applied.

I claim:

1. In a checking device, the combination of a casing having a by-pass, a piston having a relief opening, and a tapered controlling valve passing through the "relief opening, said relief opening and by-pass'be' ing so arranged that both thereof are closed in one position of said as described. I

2. In a checking device, the combination of a cylinder having a bypass, one entrance to Which is Within the length of the cylinder, a piston in said cylinder adapted to cover and uncover said entrance, said piston having a relief port, means for varying the area of said relief port in different positions of said piston, said relief port being entirely closed at a point in the travel of the piston Which immediately precedes the uncovering of said entrance, substantially as described.

3. In a checking device, the combination of a cylinder having a bypass, one entrance piston, substantially Copies of this patent may be obtained for five cents each, by addressing the Commissioner or Patents,

to which is within the length" time cylin= der, a piston arranged to cover and uncover said entrance, said piston having an aperture, a tapered rod in said cylinder and mounted in the aperture in said piston, said rod in its untapered portion substantially closing the diameter 0 said rod and said entrance being so positioned that said piston at one position thereof may'c'lose said entrance and be positioned on a portion of the full diameter of said rod, substantially as described. 7

Signed at Chicago, Illinois, this 18th day of March, 1915. 1 r

I DONALD E. WILLARD. Witnesses:

C. F. MOONEY, T. D. BUTLER.

Washington, D. G."

ortthrough said piston, the full

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