US810021A

US810021A - Door-check.

Info

Publication number: US810021A
Application number: US23818204A
Authority: US
Inventors: Ludwig Audrieth
Original assignee: Individual
Current assignee: Individual
Priority date: 1904-12-24
Filing date: 1904-12-24
Publication date: 1906-01-16
Anticipated expiration: 1923-01-16

Description

No. 810,021. PATENTED JAN. 16, 1906. L. AUDRIETH.

DOOR CHECK.

APPLICATION FILED DBO. 24. 1904.

PATENT orrron.

LUDWIG AUDRIETH, `OF NEW YORK, N. Y.

DOOR-CHECK.

Specification of Letters Patent.

Patented Jan. 16, 1906.

Application filed December 24, 1904. Serial No. 238,182.

To all whom, t may concern:

Be it known that I, LUDWIG AUDRIETH, a citizen of the United States, residing in New York, borough of Manhattan, in the State of New York, have invented certain new and useful Improvements in Door Checks, of which the following is a specification. A

This invention relates to improvements in door-checks known as liquid door-checks, in which a fluid is employed to secure the easy closing of the door and to resist the power of the door-spring, the object being to produce the effective working of the check and a cushioning action of the fluid against the tension of the door-spring during the closing of the door; and with these ends in view the invention consists of a door-check which embodies the novel features and combination of parts to be fully described hereinafter and finally pointed out in the claims.

In the accompanying drawings, illustrative of one embodiment of the invention, Figure l isa horizontal section showing the connection of my improved door-check with the door and door-casing, the dotted lines indicating the position of the parts when the door is opened. Fig. 2 is a side elevation of the improved door-check, partly in section. Fig. 3 is a vert-ical central section of the same on line 3 3, Fig. 2, Fig. 4 is a top view of Fig. 8; and Fig. 5 is a horizontal section on line 5 5, Fig. 3.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, a designates a cylindrical casing which is provided with exterior flanges a, cast integral therewith, by means of which said casing is attached to the door in the usual manner. The casing is closed at the bottom and open at the top, the bottom being provided with a central depression which forms a step-bearing for the spindle b, that is supported centrally in the casing. The top of the casing a is closed by a cover d, which is provided with a stuffingbox d. The intermediate portion of the spindle between the bottom and cover is square in cross-section, while the lower end and the upper end, that projects through the cover and stuffing-box, are circular in crosssection, so that the spindle turns loosely in the bottom and cover of the casing.` The upper end of the spindle is extended above the stuffing-box d and made square, as at b, so as to be connected with the split end of the lever j, which is attached to the square end b by a suitable clamping-screw and connected at its outer end by a suitable link f with the door-casing in the usual manner, as shown in Fig. 1. On the square upper end b of the spindle and resting on the upper end of the rounded neck portion of the same is placed a hexagonal collar b2, by which the spiral spring 7L, coiled about the spindle, is

set to proper tension for applying the lever f to the upper end t of the same. When the lever is removed, the spring h is returned to its normal position. The helical spring rests with its lower end at the interior of a hollow plun er g, the square central socket gf of whic is slidable on the spindle, said plunger being provided on its outer surface with a helical thread or rib which engages a helical groove formed in the inner wall of the casing, so as to turn with the spindle, but be moved simultaneously in an upward direction. The plunger is provided in its bottom with elongated openings i, which are closed by a springactuated ring-shaped valve 7c, that extends around a boss at the bottom of the plunger, as shown in Figs. 2 and 3. When an extra tension is required, a second helical spring 7L is arranged within the larger spring h, as shown in Fig. 3, The lower end of the casing is connected by a radial boren with an exterior tube a', which may be cast at its upper and lower ends into the casing or inserted into bores in the same, said tube being connected at its upper end by a lateral bore n2 with the interior of the casing below the cover, the cover being tightly screwed into the upper end of the casing. The upper ends of the helical springs h 7L bear on a sheetmetal washer t, interposed between the under side of the cover and the upper ends of the springs, as shown in Fig. 3, so as to take up the friction of the springs with the under side, of the cover. For increasing or decreasing the size of the bore n2 an adjustable plug o is employed in order to accelerate or retard the .flow of oil or'other liquid in the casing through the bore n2 back into the casing, whereby the do'or can be made to close with the desired rapidity. When the door-check is in use, the interior of the casing is partly filled with oil or other liquid. When the casing is turned with the door in the direction of the arrow, as shown in Figs. 1 and 5, on opening the door the spindle is turned on its axis by the lever f. This produces the upward motion of the plunger on the spindle in the helical interior grooves of the casing, so that the pressure IOO exerted on the liquid by the upward motion of the plunger opens the valves ybelow the plunger and forces the oil through the bottom openings in the plunger and into the lower part of the casing, while simultaneously the door spring or springs are set to tension. As soon as the door is released the action of the springs regaining their former position produces the return of the plunger and the turning of the spindle, so as to exert by the connecting-leverf and link f the gradual closing of the door, which is retarded by the resistance of the oil in the lower part of the casing,

which is forced by the plunger slowly through the lower bore n tubular channel n, and upper bore n2 back into the upper part of the casing. The closing of the door can be more or less retarded by adjusting the size of the opening of the bore by means ol the screwplug 0.

When the door-check is to be applied t'o a door opening in the opposite direction to that shown in Fig. l, the spring or springs as well as the plunger g have to be set in position corresponding to the motion of the csaing, so that the same check is applicable to doors opening left or right. The tension of the spring or springs is adjusted to greater or less extent by means of a wrench applied to the hexagonal collar b2 at the upper square end of the spindle, said spindle being held in the required position until the lever has been attached thereto, when the wrench is removed and the door-check in position Jfor regular action after the screw-plug that regulates the size of the upper bore has been placed in proper position.

Having thus described my invention, I claim as new and desire to secure by Letters Patent* 1. In a door-check, the combination, with a casing, of a spindle turning in step-andneck bearings in the bottom and cover of said casing, the intermediate portion of said spindle being square in cross-section, a plunger provided with a square socket slidable on the intermediate portion of said spindle and with bottom openings, and having an exterior thread or rib guided in helical grooves formed in the inner wall of the casing, a spring-actuated valve below said bottom openings, a helical spring interposed between the plunger and cover, and a regulable channel connecting the lower portion of the casing with the upper portion thereof.

2. In a door-check, the combination, with a casing attached to the door, of a rotatable spindle turning in step-and-neck bearings in the bottom and cover of said casing, a plunger provided with a square socket guided on said spindle and with openings extending therethrough, said plunger having an exterior rib guided in helical grooves formed in the inner wall of the casing, a spring-actuated valve below said plunger-openings, a helical spring interposed between the plunger and cover, a channel connecting the lower portion of the casing below the plunger with the upper portion thereof above said plunger, and a screw-plug 'for regulating the passage of liquid through said channel.

3. The combination, with a door, of a casing attached to the door, a spindle supported in step-and-neck bearings in the bottom and cover of said casing, said spindle being square in cross-section within the casing and having endsof circular cross-section rotatable in the bottom and cover, and a square upper end provided with an adjusting-column, a connecting-lever applied to the outer square ends of said spindle, a link connecting the outer end of said lever with the door-casing, a plunger guided by a rib in helical grooves formed in the inner`wall of said casing and slidable on the square portion of said spindle, and a helical spring interposed between said plunger and the cover of said casing.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

LUDWIG AUDRIETI'I.

Witnesses:

PAUL GOEPEL, HENRY J. SUHRBIER.