US306351A - Pneumatic door-check - Google Patents

Description

(No Model.)

S. PORTER.

PNBUMATIO DOOR CHECK.

Patented Oct. 7,1884.

` INVENTDR WITNEEEES N4 mams, rhumulmgfnpnen wnsnmgno". uc.

Nppp TTES Barnett Erice.

STEPHEN PORTER, OE BOSTON, MASSACHUSETTS.

PNEUMATiC DOORMCHECK.

SPECIFICATION' forming part of Letters Patent No. 306,351, dated October 7, 1884.

Application filed December 17, 1883.

To all whom may concern:

Be it known that I, STEPHEN PORTER, of Boston, in the county of Suffolk and State of Massachusetts, a citizen of the United States, have invented certain new and useful Improvements in Door-Ohecks, of which the following is a specication.

My invention relates to that class of contrivances known as door-checks,77 in which the resistance ot' a body of compressed air is opposed to the closing movement of a door, so that its slamming or noisy closing is prevented, and it has for its object to provide means whereby a noiseless closure of the door will be automatically effected.

My invention inthe best form now known to me is illustrated in the accompanying drawings, in which Figure l shows aside view, and Fig. 2 a sectional view, looking from the top of a door-check andspring embodying my invention as applied ready for use.

My improved door-check contains the fea tures of an air-compression chamber; also, a spring for closing the door against the resistance of a body oi compressed air, means for regulating the tension of the said spring, and suitable `ineans for applying the device as a whole in proper position with regard to the door upon which it is to operate.

My present invention consists in improvementsin the means of compressing the air, and in the means whereby the regulated closure of the door is obtained.

A represents a barrel or cylinder, within which inoves a hollow piston or plunger, B. This piston or plunger is packed at two places within the cylinder A, as shown at c and d, and an air-passage, C, is made through the shell of the piston opening into the cylinder A, between the two places where the piston is packed, so that the portion oi' the cylinder A between the packings and the interior of the hollow piston-rod form an air-chamber. Through this piston-rod I obtain the supply ci' air required to form the air-cushion by making an aperture in the rod, as shown at D, provided with a valve, which allows the inflow of air while the piston is moving in one direction, but which closes and prevents the outilow of air when the piston moves in the other direction, and acts as an air-compressor.y I

alsoprovide an openin g from the piston (shown (No model.)

.at E) of suitable size, through which the conipressed air may escape as the door closes.

E represents a coiled spring, which, for convenience, is placed within the same cylinder or barrel A; This spring operates vto close the door bypressure against the piston B, which is connected with the door by the bracket G, to which it is attached. The tension of this spring E, and consequently the force with which it acts to close the door, is regulated by means of a suitable adjusting device--preferably consisting of an abutment or bearing, H, acting against the base ofthe spring Rand provided with adjustingscrews h, whereby the pressure upon the spring, and consequently its amount ot resistance, may be regulated at pleasure. By this means I am enabled to adjust the door-check to any weight ot" door, and also to vary its power from time to time, if this, for any reason, should become necessary, and I am also enabled to dothis while the door-check is in place. These adjusting-screws may conveniently bear in the cap I, which connects the cylinder A and its incloscd mechanism with a second bracket or hinge, K, attached to the jamb of the door at the proper location relatively to the line of the hinges, as shown in Fig. l. The other end of the cylinder A is closed by a sleeve, L, which is extended to form a bearing for the. piston-rod B.

The device operates as follows: As the door is opened the difference of the length of the radii on which the cylinder A and the piston B swing causes the latter to travel through the cylinder and compress the spring F, the space in the cylinder between the packings o and d and the interior ofthe piston B being at the same time iilled with air,whicl1 enters through the valve D. The compressed spring F will now force the door to with atension regulated as described, and this will cause the packings d and o to approach, so that the air between them and also that within the hollow piston is compressed, and thel closing of the door retarded until the slow escape of air through the aperture E allows the door to gradually and noiselessly close under the spring-pressure.

I am aware that door-checks have been previously constructed or described which contain the features, broadly, or" an air-compressgradually IOC ing piston connected with a spring, and attached to a door and acting within a cylinder connected with a part adjacent to such door at such a point relative to the hinges that the cylinder shall swing on a relatively shorter ra- 5 dius than the door and piston when the door is opened and closed.

I make no claim to any of these features, broadly.

I claim- 1o 1. In a door-check, the combination, with the air-compression chamber, formed by the cylinder and the packed hollow piston, said piston working within said cylinder and being provided with an air-vent of iixed size, of the 15 door-closing and air-compressing,` spring, and

means for regulating its tension or force, all

substantially as and for the purposes set forth. 2'. In a door-check, the combination of the following elements, to wit: an air-inclosing cylinder, a hollow perforated piston working 2o therein, a valvcd air-inlet, and an air-outlet, the said piston being packed at two places within the said cylinder on either side of the perforation.

3. Inadoor-check, the hollow piston B, pro- 2 5 vided with a valved air-inlet, an air-outlet, and an aperture, C, connecting,` the interior of the piston with that portion of the cylinder A within which and the hollow piston the air is compressed.

In testimony whereof I have hereunto subscribed my name this 10th day of December7 A. D. 1883.

STEPHEN PORTER.

Vitnesses:

OHAs. W. KNAPP, J. HENRY TAYLOR.

Images