US1705334A - Automatic door closer - Google Patents

Description

March 12, 1929. w, OTTO "1,705,334 I AUTOMATIC DOOR CLOSER Filed May 6, 1927 gwvmtoz Miller WOttO Patented Mar. 12, 19 29.

MILLER w; one, or AURORA;

ILLINOIS, ASSIGNOR TO LARIIVEER} COMPANY, OF

AURORA, ILLINoIs, A CORPORATION.

AUTOMATIC noon CLOSER}.

Application filed May 6,'

.My invention relates to automatic door closers, particularly to a device of this character wherein spring power is employed for closing the door and pneumatic means for 5 cushioning the closing operation.

The object of the invention is to provide a neat, durable, dependable and inexpensive device of this character, all as will be hereinafter more clalmed. I 7

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts, V

Figure 1 is a side elevation illustrating one application of my invention,

Figure 2, a top plan view, 7 FigureB, a similar view with the a partly open position,

Figure 4, a detail of the piston, I Figure 5, a detail illustrating the method of controlling the. escape of air from the pneumatic chamber, and v Figure 6, a'view of thescrew shown in Fig. 5 andat right angles to said figure." In the drawings reference character 10 indicates a screen or other door of light con struction upon which is mounted a spring hinge 11 provided with an arm 12 having an opening 13 at its outer end and an intermediate opening 14 on its inner edge. A link 15 has one end pivoted in a fastening element 16 upon the door frame and has its other end,

door in extending through the perforation 13 in the arm 12. By this construction, when the door 10 is swung outwardly the arm 12 will be held stationary by the link 15 thus effecting a twisting of the spring 17 of the spring 11 and when the door is released it will be caused to close under the action of such spring.

In order to prevent the slamming of the door, I provide pneumatic means for cushioning the action of the spring hinge which in the present instance comprises a cylinder 18 supported by means of a bracket 19 in which it is threaded or otherwise secured. A piston is provided for reciprocation within the cylinder 18 and said pistonv comprises a spool, as shown in Fig. 4, having a central axis 20 provided with longitudinally spaced disks 21, said axis terminating in a tapered or conical boss 22 extending from the center of one of said disks and being provided particularly described and central boss 22.

hinge 1927. Serial No. 189,339.

with a ring 23 at its opposite end centrally of the disk. g

T he disks 21 of the piston spool are a sufiicient distance apart to insure the proper guid-,

ing and bearing of the I piston within the cylinder. I v

A link 24 connects the ring 23 and the arm 12 of the spring hinge so that as the door and cyl nder 18 thereon are moved-relative to such arm, the spool will be reciprocated in the cylinder 18. The side the tapered oreonicalboss 22 is preferably convex toform a seat for a piston leather or cup washer 26. I

The piston leather 26 is provided with a the small outer end of the tapered or conical boss and to fit tightly about the inner end of of the disk 25 adj acent perforation of a sizeto fitloosely on.

by a loose washer 27 held in place by cotter pin 28 extending transversely through the This construction is very simple and the piston leather is prevented from slipping off the boss and yet no threads, nuts, expanders or the like are used. The tapered or conical boss permitsthe leather cup to reach an air tight position when pressed against the convex face 25 of the disk 21 andv the forward travelof the pistonwith the-closing of the door favors and maintains this air tight Also, on account position of the leather cup. of the free movement of the leather cup, its center and bottom are forced forward which causes a positive and full expansion of the sides of the leather cup outwardly against the inner cylinder wall which forms an excellent air cushion or compression chamber within the end of the'cylinder. V

The return or backward travel ofthe piston on the opening of the door, moves the center of the cup leather backward to the position shown in Fig. {l permitting the flange or periphery ofthe leather cup to contract or relax practically eliminating friction, suction and wear on the same.

In order to control the cushioning action of the piston, I preferably provide an opening 29 in the portion of the bracket 19 at the bottom of the cylinder 18 andcontrol such )assa e b means of a screw 30 havin a tv y tapered flattened side 31 so that by longitudinal movement of the screw. the passage of air through the opening 29 may be controlled as desired.

One Very important feature of my invention is-due to the particular arrangement of the parts which-permits the-door to be opened as freely with my device applied as it was before, or, in other words, through an angle of 180 on doors of medium thickness and using medium size hinges. Also, my device may be installed on right and lefnhandidoors without changing any parts, it being only necessary to invert the device asitfunctions equally well in either position all of the parts extension against said convex surface and The device may be rendered inoperative by merely disconnecting the end of the link 15 from the opening 13 in the arm 12; This permits the removal and replacement out the screen door without altering the adjustments or the-application of'tools in my device.

It will beobvious to thoseskilled in the art that various changes may be mad'ein'my device witho-ut departing from the spirit oi my'invention, andI, therefore, do not limit myself to-what is shown in the drawings and describedinthe-specification, but only-as setiorth 1n the appended claims.

-Having-thus fully deser-ibed my said inven ti'on,;what- I claim as newand desire to secure by Letters Patent, 1s r 1. A piston comprising anielongated body,

a pair of transversely arranged members mounted?in longitudinally spaced relationon said body and adapted to cooperate with a.

cylinder wall for; maintaining said body in axlalrel'ation relatlve to the eyl1nder-,-,the side of one of'saidmembers remote from-the'othei" member beingof a convex shape, said body having a tapered extension adjacent saidiconvex portion, and an-oppositely disposedcup shaped gasketlongitudinally'slidable on said tapered extensionand adapted' when moved in one direction to be moved along {the tapered against the cylinder wall to prevent the passage of air by the piston, substantially as set fblfltll:

2: A piston comprising a central axis,

spaced disks carried by'said' axis, said axis non-seating position and; out; of en agement with the cylinder wall to permit the passage of air by the piston, substantially assetforth.

3'. A, device of the class described; comprising a cylinder, a' piston in said cylinder adapted to be movedlongitudinally for compressing air for cushioning the movement" of the piston in one direction said piston comprising a pai'rof transversely arranged memi bers disposed in longitudinally spaced relation, one of the members having a convex:

outer side, ataperedextension extendinglongitudinally from said" convex side, acup shaped. gasket loosely mounted on said tapered exteiisioirand adapted when thepisten V is moved in one direction-tomove-away from the cylinder wall and theconvex side to permit a1ntopass around the peripheryotthe gasket and around the projection throughthe center of the gasket, but adapted whenthe;

piston-is movedin the opposite direetionto be forced by the ill!" against said convex outer side unt1l, the central perforation lie-the gasketis closed by the tapered boss, andsuclrgas ketisxoutwardly expanded-into snug engagement; with the cylin'der' wall,substantially as set forth. r

In witness whereof, I have hereunto set my hand ati Aurora, Illinois, thisfourthday May, A. D. nineteen hundred and twenty seven.

Mmnnnwt oa ro;

Images