US552006A

US552006A - Pneumatic cushion for sliding doors

Info

Publication number: US552006A
Authority: US
Publication date: 1895-12-24
Anticipated expiration: 1912-12-24

Description

(No Model.)

' J. P; RUNKEL.

PNEUMATIG CUSHION FORSLIDING DOORS. 7 No. 552,006. Patented Dec. 24, 1895.

UNIT D STATES ATENT 'FFICE' JOHN P. RUNKEL, or MILWAUKEE, wIsooNsIN.

SPECIFICATION forming part of Letters Patent No. 552,006, dated December 24, 189 5. Application filed May 8,1895. Serial No. 5&8519. (No model.)

To (ZZZ whom it may concern.-

Be it known that 1, JOHN P. RUNKEL, of Milwaukee, in the county of Milwaukee and State of \Visconsin, have invented a new and useful Improvement in Pneumatic Cushions for Sliding Doors, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

My invention has relation to improvements in pneumatic cushions for sliding doors, particularly adapted, although not necessarily, for elevator-well doors.

The object is to provide a simple form of pneumatic cushion adapted to be actuated to preventjar'or concussion either in the opening or closing of a sliding door, the device being particularly advantageous in connection with an elevator-well door which is opened or closed by means of spring action, such doors, under ordinary circumstances, being particularly subject to jar and concussion.

In the accompanying drawings, Figure 1 is a front elevation of an elevator-well door and the frame therefor, showing my improvement applied to the hangers of the door. Fig. 2 is a longitudinal sectional view of one of the cylinders shown in Fig. 1. Fig. 3 is an end view of the right-hand end of Fig. 2. Fig. 4 is a detail view of the screw-valve, looking at the point of the valve and against the inner side of the head of the screw; and Fig. 5 is a fragmentary view of a modified form.

Like numerals of reference denote like parts throughout the several views.

Referring to the drawings, the numeral 7 indicates the front wall of the elevator-well 5 8 8,

the side walls thereof, and 9 the elevator-well door. Connected to the door are the usual hangers 10 10, in which are journaled rollers 11 11, traveling on the trackway 12. To the top connecting-piece 13 of the hangers are bolted end supports or legs 14 14 and lat 14 for cylinders 15 15. Each inner support 14 is provided with an outwardly-projecting lug 16, having an opening therein communicating with a small opening through the center of the end support, said smaller opening having a conical valve-seat 17 therein. The aperture of the lug is threaded to receive the threaded portion of a screw-valve 18, said screw-valve having an inner reduced unthreaded portion terminating in a conical end, which is adapted, when the valve is screwed in, to fit the valveseat, and thereby close the opening.

Each outer leg or support of a cylinder is provided with a central opening to receive therein the outer end of the cylinder, said outer end being open.

In each cylinderis a piston-rod 19, the outer end of which extends through the open end of the cylinder. The piston carried on the inner end of each rod consists of a metallic disk 20 and a leather packing 21, held against the face of said disk by means of a nut 22. This packing is somewhat smaller in diameter than the diameter of the disk, and has projecting outwardly from its periphery an annular flange 23, the edge of which, when the piston is on its in stroke, is adapted to be forced tightly against the inner wall of the cylinder by the resistance offered by the air-pressure.

The top portions of the outer supports 14 14 are provided with apertured lugs 24 24, through which passes freely a rod 25. The opposite ends of this rod are securely con nected to the respective outer ends of the piston-rods by means of arms 26 26.

Projecting inwardly from the side walls 8 8 are arms 27 27 which are provided upon their ends with rubber buffers or cushions 28 28.

- In the operation of my device, when the door is slid toward the arm 27 for the purpose of opening the doorway, the end of rod will contact with the rubber buffer or cushion of said arm, and thereby force the rod 25 in an opposite direction to that of the travel of the door and cause the piston in cylinder 15,

by reason of its piston-rod being connected up to the rod 25, to travel inward, while the piston in cylinder 15 is simultaneously made to travel outward. When the door is subsequently closed, of course the reverse operation takes place that is to say, the left-hand end of rod 25 contacts with the rubber buffer or cushion of arm 27, and the piston of cylinder 15 is forced inwardly, while the piston of cylinder 15 is simultaneously forced outwardly.

It is advisable that the screw-valves 18 be at the adjustment indicated in Fig. 2 to permit of the-escape of a small quantity of air.

ble-cylinder arrangement, wherein instead of employing only one rod 25 above the cylinders an additional rod 25 is used, arran ged be low the cylinders and passing through suitable openings therefor in the outer supports 14 14.

Instead of the connecting-arms 26 26 used in the form illustrated in Figs. 1 and 2, I employ longer arms 26 26, which extend down to and connect with the ends of the rod 25.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a pneumatic cushion for sliding doors, the combination, of cylinders carried by the door, each of said cylinders having one end open,pistons within the cylinders having their piston-rods projecting through the open ends of the cylinders, a device slid ingly mounted to move with the door, said device having connection with the respective piston rods to cause said rods to move in unison, and buffers located in the path of movement of the connecting device, substantially as described.

2. In apneumatic cushion for sliding doors, the combination of cylinders carried by the door, each of said cylinders having one end open, pistons within the cylinders having their piston rods projecting through the open ends of the cylinders, a rod slidingly mounted to move with the door, said rod having connection with the respective piston rods to cause said piston rods to move in unison, and buffers located in the path of movement of the connecting rod, substantially as described.

3; In a pneumatic cushion for sliding doors, the combination, of a door, hangers secured thereto, rollers journaled in the hangers, a track-Way for the rollers, supports secured to the connecting piece of the hangers, cylinders carried by the supports, said cylinders having their outer ends open, pistons within the cylinders, the rods thereof projecting through the open ends of the cylinders, a device slidingly mounted to move with the door, said device having connection with the respective piston rods to cause said rods to move in unison, and buiiers located in the path of movement of the connecting device, substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN P. RUNKEL.

\Vitnesses:

ARTHUR E. lVIoRsELL, ANNA V. FAUST.