US502841A - Pneumatic door-check - Google Patents

Description

(No Model.)

J. W. WETMORE. PNEUMATIC DOOR CHECK.

No. 502,841. Y Patented Aug. 8, 1893.

Wilnessew.

UNITED STATES PATENT Orricn.

JEROME W. WVETMORE, OF ERIE, PENNSYLVANIA, ASSIGN OR TO THE VAN WAGONER & WVILLIAMS COMPANY, OF JERSEY CITY, NEIV JERSEY.

PN EU MATlC D'fOOR-CHECK.

SPECIFICATION forming part of Letters Iatent No. 502,841, dated August 8, 1893. Application filed June 25, 1883:. Serial No- 99,134. (No model.)

T0 at whom it may concern.-

Be it known that I, JEROME W. WETMORE,

citizen of the United States, residing at-Eri,

in the county of Erie'and State of Pennsylvania, have invented a new and useful Improvement 1n Pneumatic Door-Checks, of WhlCll the following isa specification.

Door checks embodying my invention, be-

long to that general variety, which are used upon doors, which areprovided with springs for closing them, Whether said springs be organlzed as parts of hinges, or separately applied tothe door and frame.

One object of my invention, is the produc- Mom of a simple, compact, and effective pneumatic door-check, having an extensive rangeof rapid movement as between the piston and 1ts cylinder, and to accomplish these ends, I have for the first time so organized an air cylinder, that it oscillates on a central axis during the swingingmovements of a door when controlled by the door'check; In other words, my door check includes in combina-v tion an air cylinder, a bracket by which said cylinder is supported ina horizontal position for service, and to which said cylinder iscen trally pivoted to enable it to oscillate as on a vertical central axis during the swinging movements of a door, a piston sliding in the cylinder, and a piston rod provided with a pivoted arm at its outer end.

Another object of my invention is to provide for a prompt release of compressed air within the cylinder 3' ustprior to the complete closure of a door, and this I accomplish for the first time, as I believe, by the combination with the air chamber, of a piston and an automatically operated valve which is opened by the piston just prior to the termination of its air compressing movement, and I have still further provided for variably adjusting the valve operating devices, so that the release of air pressure can be graduated to exact requirements.

hereunto annexed. I Referrmg to the drawings, Figure-1; illustrates a door and its frame, with one of my oscillating cylinder doorcl ecks, as applied to operate at the inner side of the door, the

latter being shown in an opened position. Fig. 2, illustrates the same parts, with the top of the door frame removed, for showing the door check in top or plan view; and in dotted lines, the positions of the door and the check are indicated, as when the 'door has been nearly closed. Fig. 3, illustrates the air cylinder in vertical longitudinal section, and containing a piston, its piston rod, and pivoted arm, said piston being of ordinary construction, Fig. 4, illustrates a door-frame and a closed door, provided with a well known form" of door spring, and a door check having a non oscillating cylinder containing my automatic valve. Fig. 5, is a topor plan view of the door, its frame, and the door check of Fig. 4.. Fig. 6, is an enlarged view of the door "check of Fig. 4E, detached; Fig. 7, in vertical longitudinal section, illustrates a portion of the air cylinder, its piston, its automatic valve, and its adjusting device.

, That portion of my invention which includes the oscillating air cylinder, is illustrated only in Figs. 1, 2, and 3,'-in which my door check is shown as applied to a door A, and its frame B. Y

The air cylinder 0, is for the first time pivoted so'as to oscillate in a horizontal plane, as on a vertical central axis, this latter being afforded by means of trunnion pivots o, c, and a bracket c and in this case a socket 0, serves as a bearing for one of the pivots. The piston G, within the cylinder is provided with a rod D, which occupies a large central opening in the front end C of the cylinder, and is pivoted at its outer end to the arm E, by means of which, proper connection is-made with the door.

As clearly indicated in Fig. 2, the outward swinging movement of the door, to the extent of ninety degrees or a little more, causes the piston to move the entire length of the interior of the cylinder. The inward movement of the piston is very rapid duringthe earlyclosing movement of the door, butduring the terminal closing movement, the; piston moves very slowly against the air cushion promptly developed at the outset, by the action of a door spring of any kind, as for instance, the

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well known torsional spring S, shown in Fig. 4. The piston G of Fig. 3, with its packing g, valve II, spring I, central opening I, and bail strap F, are all substantially as heretofore.

For promptly releasing the compressed air, I have devised an automatic valve, which when applied in its simplest form, affords no external evidence of its presence, and hence it is not shown in all of the figures.

In Fig. 7, I illustrate said automatic valve, as employed in connection with any form of door check air cylinder, whether it be arranged to oscillate in accordance with one portion of my invention, or pivoted as heretofore, either at its extreme rear end, or at its extreme front end.

The piston G, has its rod D, coupled thereto by a bail strap F, in a manner well known, and any suitable packing g, is employed for securing close contact with theinterior of the cylinder 0. There is a port or openingin the piston, covered by a spindle valve II, which is normally held to its seat by a light spring I On the front side of the piston, a lever L, is pivoted on asuitable projecting stud. One end of said lever, engages with the valve H, and its opposite end is bent or curved so as to pro ect far beyond the end of the piston, so that as the piston near the end of its stroke, causes the bent end of the lever to strike against the inner or closed end of the cvlinder, the valve will be lifted from its seat, and the compressed air permitted to freely escape through the piston into the front portion of the cylinder, and out into the open air through the large opening in the.

head 0', which is only partially occupied by the piston rod. The spring of the valve 11', is so light thatwhen the piston is moving outward, air can freely pass through the port to the closed end of the cylinder. It will be seen that in ,order to render this automatic valve adjustable in its releasing action, the abutting point of the lever must be variable,

and I provide for this by the use of an ad justing thumb screw m, entering through the end of the cylinder to afford convenience in manipulation, and the inner end of said screw, serves as the variable abutment with which said lever engages. It will be understood that this automatically operated releasing valve is applicable to air cylinders hinged as heretofore, as for instance, as illustrated in Figs. 4. 5, and 6, wherein the cylinder is mounted upon an open hinge bracket K, .I, having a hinge pin Z, and nails or screws j for attaching the whole in position for service.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-- 1. In a pneumatic door check, the combination substantially as hereinbefore described, of an air cylinder, a bracket adapted to be applied to a door frame below its top and by which said cylinder is supported in a horizontal position for service, and on which said cylinder is centrally pivoted and capable of oscillating as on a vertical central axis during the movements of a door, a piston, and its rod provided with a pivoted arm at its outer end.

2. In a pneumatic door check, the combination with the aircylinder and its piston, of an automatically operated valve for releasing compressed air, just prior to the terminal air compressing movement of the piston.

3. In a pneumatic door check, the combination with the air cylinder and its piston, of an adjustable automatically operated valve for releasing the air pressure, substantially as described.

4. In a pneumatic door check, the combination of the air cylinder, the piston,a normally closed valve for controlling compressed air, and a lever actuated by the piston for opening said valve, substantially as described.

5. In a pneumatic door check, the combination substantially as described,of the air cylinder, the piston, the normally closed valve thereon, the lever on said piston attached to said valve, and an adjusting screw serving as a variable abutment for contact by said lever during the terminal air compressing movement of the piston, and causing said valve to open for releasing the compressed air.

JEROME W. IVETMORE.

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