US278783A

US278783A - downes

Info

Publication number: US278783A
Authority: US
Publication date: 1883-06-05
Anticipated expiration: 1900-06-05

Description

G. W. Downs. DOOR SPRING.

Nd. 278,783. Patented June 5,1888.

. N. rs'rznsv Pholn-Ulhegrapher. WasbirvgXon. ac.

'VNITED STATES GEORGE W. DOWNES,

on NEW YORK, N. v.

DOOR-SPRING.

SPECIFICATION forming part of Letters Patent 1\ To. 278,783, dated June 5, 1883.

Application filed January 19, 1883. (Modeh) To aZZ whom/ zit may concern Be it known that I, GEoneEW. DOWNES, of

j the city and State of New York, have invented a certain new and useful Improvement in Door-Springs; and the following is declared to be a description of the same.

Springs for closing doors haye long been employed, and these springs have been used alone for closing the door by direct connection with the same, and also in conjunction with pivoted levers. In the latter instance one end of one pivoted lever was fastened-to the door, and the other end of the other pivoted lever was fastened to a spring-connection upon the door-. casing, and the force of the spring was here utilized through .the levers to close the door. In all these cases a continuous increasing strain is put upon the spring that frequently causes the door to close with unnecessary force. In some instances the closing device is made as part of the hinge of the door, and in others as entirely separate and independent from the hinge. My invention employs a cam-shaped arm and sliding bar operated upon by a spiral spring, and a lever-arm and roller for closing the door. The first movement of opening the door puts a certain strain upon the spring,

and the increased movement of the door adds a gradual continuous strain upon the spring until the door is fully opened, when the maximum strain is attained. The gradual increase is simply due to the are upon which the camshaped arm is made, which is just sufficient to allow of shutting the door gradually when it is released from the hand.

In the drawings, Figure 1 is an elevation of the spring device. Fig. 2 is a side elevation of the same 5 and Fig. 3 is a plan of the same, the door and easing being in section.

The spiral spring a surrounds the rod b, and said 'rod is held at its lower end in the bracket 0, in which it is free to turn, and at its upper end in the bracket cl, in which it also turns freely, and these brackets are secured to the casing A of the door. The lower end of the spiral springbears against a lug upon the bracket a, and the upper end is either connected to the rod 12 or bears against a flat spot upon said rod, and when the rod is turned it contracts the spring. The upper bracket, (Z, is made with two projecting lugs, e 0, instead of with one, like the bottom bracket, and there is a, I

f, with an eye, through which the rod 1) passes. 'To this link f the lever 7 arm 9 is pivoted by screw f, and one end of this arm g has a pawl projector or tooth, that engages the ratchet-wheel 71, which is fast upon the rod '2), and

the other end of the arm 9 carries the roller The sliding bar 7; and cam-shaped arm m are preferably made of one piece of metal. One end of the sliding bar is connected with the bracket d by the hinge-joint e", and it moves freely in the guide I, which guide also forms a bearing for the bar k and a means of connecting the same with the door B, to which said guide Z is attached. The arm on is in shape likea sector, and is also cam-shaped, the exterior surface of the arm near the sliding bar 7- being farther from the hinge-center 6" than the exterior surface at the end of the arm, and said arm has a depression at its end, and also near the sliding bar k, as shown in Fig. 3, andthis arm m is hollowed out for the roller 2',

which runs over its surface.

In Fig. 3 of the drawings the door is shown as shut and the parts heretofore named as at rest in their normal position. The spring is tightened or strained by a key applied to the square head of the rod 1), and the spring-pressure, acting through the ratchet-wheel h, pawl or tooth g, lever-arm g, and roller 5 against the canrshaped arm m, keeps the door shut, the. roller 2 resting in the depression a 011 the end of the said arm m. As the door is opened the roller is raised out of the depression or and rests the camshaped arm m until the depression 0 IOO closed, and as the rolleri sinks into the depression n a final push is given the door, which insures it shutting completely.

The depression 0 may be omitted, if desired, or the extra length of the sliding bar may be cut oil, as it is only necessary with heavy doors having large hinges, which compel a greater swing of the door and consequent movement of the parts than is the case in a small door.

I claim as my invention- 1. In a door-spring, the spiral spring a, rod 7), brackets c d, and ratchet-wheel h, in combination with the link f, lever-arm g, its pawl g and roller i, the sliding bar 7c and its guide Z,

and the cam-shaped arm m substantially as set forth. I

2. The combination, "with the spring and its axis, of brackets to support the same, a ratchet-wheel upon the axis of the spring, a lever having apawl at the end of it, and alink through 20 one end of whieh the axis passes, the other end being pivoted to the lever, substantially as set forth.

3. The spring and its axis, and the brackets for supporting the same, in combination with 2 5 a sliding bar, k, hinged to the upper bracket, the sector m at the end of the sliding bar k, provided with depressions n and o, the lever-arm g, roller 2', link f, and ratchet-wheel h, substantially as set forth. 3o

Signed by me this 16th day of January, A. D.

GEORGE WC DOWNES. Witnesses:

HAROLD SERRELL, GEo. T. PINCKNEY.