US909074A - Door-check. - Google Patents

Description

Patented Jan.5, 1909.

M. J. FLYNN.

DOOR GHBCK.` APPLIOATION FILED FEB. s, 190s.

nu: Nomals PETERS c UNITED STATES PATENT OFFIOE.

MICHAEL I. FLYNN, OF NEW YORK, NZY., ASSIGNOR OF ONE-HALF TO EDWARD W. MCCARTY, OF BROOKLYN, NEW YORK.

DOOR-CHECK.

Specification ofnLetters Patent.

Patented Jan. 5, 1909.

To all whom it may concern:

Be it known that I, MICHAEL J. FLYNN, a citizen of the United States, residing at the city of New York, in the borough of the Bronx and State of New York, have invented certain new and useful Improvements in Door-Checks, of which the following is a full, clear, and exact description.

My invention relates to a construction of door check of that type adapted to be embedded in the door frame between or in proximity to the hinges, and having a flexible spring-impelled connection with the door to normally close the same.

An apparatus of this general type forms the subject of my Letters Patent No. 831,051, issued September 18, 1906, and also my pending application, Serial No. 266,7 37.

The present invention includes a number of matters of improvement in the features of the above construction; and also some additional features which I consider as entirely novel.

The objects of the present invention are to generally simplify, strengthen, improve and cheapen the construction, so that it acts more positivel and more reliably, than the door checks hitherto constructed.

I also provide for checking the return movement of the door in a very gradual manner throughout substantially its entire range of closing movement, the checking resistance being, however, removed just as the door is about to latch, so that the full effective pressure of the closing spring is available to accomplish the latching movement.

I also provide a form 0f valve construction designed to be particularly eflicient in its o ening and closing action, so that the full c ecking force is always available when the door is being closed, but is entirely removed when the door is being opened.

A still further object of the invention is to provide a quick, accurate and very accessible adjustment for varying the degree of the checking action when the door is being closed, so that it may close slowly or rapidly as desired.

With these and other obj ects in view, the invention consists in the features of construction and combination, as hereinafter set forth and claimed.

In the drawings: Figure 1 is a sectional view of a complete door check embodying the principles of my invention; Fig. 2 is a detail sectional view of the same on a plane at right angles to that of Fig. 1; Fig. 3 is a detail sectional view of the adjusting valve mechanism; and Fig. 4 is a detail side view partly in section of a modied form of adjusting valve mechanism.

Referring to the drawings in which like parts are designated by the same reference sign, 1 indicates a cylinder or casing adapted to be inserted inthe door frame between or adjacent to the hin es in a manner which is well understood in t 's class of devices. The pivotal axis 2 of the door hinges normally falls at a point on one side of and in transverse alinement with the open end of the cyl inder or casing 1, under these circumstances.

3 designates an 'anchorage block, which is adapted to be screwed or received into the door at a point where it will move toward and from the open end of the cylinder 1 when said door swings on its hinges.

In the open end of the cylinder 1 there is inserted and fixed a block 4, with ears 5, having holes through which screws may be inserted as a fastening means. The block 4 has openings 6 and 7, extending therethrough, of which 6 loosely receives a resilient member 5, preferably a steel wire cable.

9 desi nates a roller rotatably mounted in the bloc 4, and adapted to su port the resilient member 8 on the side t ereof corresponding `to the pivot line 2 of the door hinges. At its outer end the resilient member 8 has a ball 10, received in a socket 11, so as to establish a universal oint connection therewith. The socket 11 may be clamped in the member 3 by a set screw 12. At its other end the resilient member 8 is fixed to the spring abutment 13, which moves loosely through the cylinder 1.

14 desi nates the return spring included between t e block 4 and the abutment 13, so as to normally impel the resilient member 8 into the casing 1.

16 designates the piston made with an airtight fit in the cylinder 1. A preferred construction is that shown in Figs. 1 and 2, and having two disks 17 and 18, connected by screws 19, and inclosing between them a leather cup 20. The disk 18 has a circumferential groove in which is received an expansion ring 21. The expansion ring 21 eeps the packing cup 20 pressed outward against the walls of the cylinder 1. A hole 22 extends completely through the piston and terminates on the outer face of disk 17 in a slightly raised rim or bead 23.

5 24 designates a soft packing disk fastened to the spring abutment 13 in any suitable way, as by central screw or rivet 25@ The piston 16 has a limited axial movement to-` ward and from the spring abutment 13 which permits the packing disk 24'to engage and disengage from the bead 23, thereby constituting a valve. A convenient means for securing this relation comprises a pair of screws or studs 28,A projecting from the disk 17, and loosely received in openings 29 of spring abutment 13. The heads 30 of these screws limit the movement of separation of the piston from the spring abutment 13 to a very slight distance.

20 At its inner end the bore of the cylinder 1 is enlarged or expanded at 37, so that the piston does not make a tight iit at such inner portion of the bore. Throughout the remainder of the length ofthe cylinder 1, however, the piston makes a perfectly air-tight fit. When the resilient member 8 is being drawn outward, its attractive force separates the abutment 13 from the piston 16, so that the central valve opening 22 in the piston is uncovered owing to the frictional resistance ofthe piston and the free movement of the abutment 13 within the cylinder and on the screws 29 connecting the abutment and the piston. On the other hand, when 3 5 the door is closing, and the resilient member 8 is rentering the cylinder, the valve opening 22 is closed by the reaction of the spring 14 on the abutment and the frictional resist- 4ance of the piston. The force of the spring is sufcient to not only insure the closure of the valve, but also to move the piston in the cylinder against the air coniined therein, and thus act as a door check.

I provide means for permitting the gradual escape of the air or iiuid beneath the piston as follows: 34 designates a tube fixed in the piston 16 and loosely movable through the spring abutment 13. This tube extends outward through the entire len th of the piston and through the hole 7 of t e block 4. At its outer end there is provided a screw 35, having a notch 36, on one side through which air may escape. This screw is always accessible when the apparatus is in operation, and

when tightened or loosened permits a more or less gradual escape of the air from behind the piston in the checking action.

In Fig. 4 a slightly modiiied form of air escape mechanism is shown including a rod 38 in place kof the tube 34. This rod projects through the opening 7 of the block 4 in the same way as tube 34, but is threaded into the piston instead of being fLxedly secured therein, as in the case of the tube 34. 39

designates a duct extending outward from the inner end of the rod and having an outlet branch 40 at a point outside the cylinder. This rod may be turned from its outer end by means of a slot 41, adapted to be engaged by a screw driver. When the rod 38 is 70 turned, it is screwed inward or outward through the piston, so that the transverse duct 40 is more or less uncovered, thereby adjusting the escape of the air in the checking action. 4 75 -n operation the cylinder or casing 1 is inserted in the door frame as above described, and the anchorage member 3 is correspondingly secured in the rear of the door. The socket piece 11 is then inserted in the an- 80 chorage member in whatever angular relation it may happen to be, and the set screw 12 is tightened to complete-the attachment. The door opens freely since the hole 22 (open at this time) is too large to aord any resistance to the passage of air therethrough. Vhen the door closes under the impulse of spring 14, the opening 22 is closed, but a gradual escape of air from behind the iston can take place through the tube 34 an past 90 the adjustable screw 35. If the checking action is too fast or too slow, it can always be regulated by a slight turn of the always accessible screw 35. At the nal movement, when the door closes, the piston enters the enlarged part 37 of the cylinder, and moves without resistance so that the door latches with the full eiiective pressure of its impelling spring.

What I claim, is

1. In a door check, a cylinder adapted to be seated in the door frame, a resilient member movable into said cylinder, said member being laterally flexible throughout its length within the cylinder an abutment anchored to said member, a spring to impel said piston inward, an abutment guided to have a limited axial movement with respect to said piston, a valve closure carried by said abutment to close an opening in said piston by its appreach thereto, and a separate channel 1n said piston for the escape of the air when the door is being closed.

2. In a door check, a cylinder adapted to be seated in the door frame, a resilient member movable into said cylinder, said member being laterally flexible throughout its length within the cylinder a piston operatively attached to said resilient member, a valve on said iston closing when the piston moves inwar y, and a supplemental channel for ermitting the escape of air when the oor closes.

3. In a door check, a cylinder adapted to be seated in the door frame, a block secured in the open end ofthe cylinder, a piston movable in said cylinder, a resilient member operatively attached to said piston, venting means attached to said piston and projecting through said block, and adjustable meansto regulate the flow of air through said outer end of said means to regulate the flow 1G means. of air therethrough.

4. In a door check, a. cylinder adapted to In Witness whereof, I subscribe my signebe leated in tle fdclor frlarra, a block seated ture, in the presence of two Witnesses.

5 int eo en en o t eey in er, apiston movable in Isaid cylinder, a. resilient member op- MICHAEL J' FLYNN' eratively attached to said piston, venting Witnesses: means attached to said piston and project- FRANK S. OBER, ing through said block, and a. screw at the ALFRED W. PRooToR.

Images