US240815A

US240815A - Door-spring

Info

Publication number: US240815A
Authority: US
Publication date: 1881-05-03
Anticipated expiration: 1898-05-03

Description

(Model.)

L. M. DBVORE.

Door Springt No. 240,815.V Y Patented May 3,1881.

UNITED STATESv y PATENT OFFICE.,

LEVI M. Duvoan, on FREEDOM, ILLINOIS.

DOOR-SPRING.

SPECIFICATION forming" part of Letters Patent No. 240,815, dated May 3, 1881.

Application filed February 24, 1881.

`-the followin gis a specification, reference being had to the accompanying drawings.

The object of my invention is to provide a cheap, durable, and efiicient door-sprin g, which w1ll so act as to hold the door either open or closed, as desired.

My invention relates to that class of doorsprings which consist of a coil of wire from which the ends of the wire forming it extend, constituting two arms,m one of which is attached to the doorjamb and the other to the door, through which arms is communicated the actuating force derived from the elasticity of the coiled wire constituting the spring. This style of spring is the simplest and cheapest in con struction of any produced; but great difficulty In adapting it to thepurpose designed has been found in the fact that while it is necessary for the proper operation of the spring that the axis of the coil should remain parallel with the plane of the door, and that the plane of vibration of the arms should beat right angles with the plane ofthe door, otherwise the force of the spring actuating the arms in different planes, the reaction from the same operating upon the opposite ends of the coil exerts a torsional strain, which causes the arms to' twist and throws the coil into such a position that its axis stands at an angle to the plane of the door and the spring becomes practically inoperative. In my invention this difficulty is overcome by bending the wire in such a manner that it forms a rigid axis for the spring, furnishing it with a bearing and maintaining it in a position at right angles to the plane of vibration of the arms.

My invention is shown in detail in the accompanying drawings, in which Figure l is a view of the spring attached to the door. Fig. 2 is a vertical section of the spring. Fig. 3 is a top View of the door and spring, showing the door closed, and Fig. 4 is atop view of the door and spring, showing the door open.

Like letters indicate like parts in the different figures.

A represents the coil of wire, one end of (Model.)

which, diverging from the coil, forms the arm c. The other end passes down through the center ofthe coil, and, emerging at the opposite end, is bent at right angles and forms the arm b, which is preferably longer than the arm a.

Upon that portion ofthe wire passing through the center of the coil is the core B. This core may be made of either wood or metal, and is of the proper size to fit easily but with approxi- 4mate closeness Within the coil.

A sleeve, C, may be inserted between the core B and the coil. If preferred, the sleeve may be made in sections, so as to permit the ends thereof to turn in opposite directions.

The arms are attached, the short one to the door and the long one to the jamb, bymeans of the clips or eyes c c, being so adjusted that as the door opens it spreads the arms and compresses the spring,the actuating force derived from the tension of which operates through the arms to resist the openingof the door until it is opened so far that the point at which the power is applied has passed beyond the point around which it operates, when the force of the spring acts to press the door open, as shown in Fig. 4. By reason ofthe wire passing through the center of the coil the arms diverge from the same end of the coil and from nearly a common point in its axis, so that their planes of vibration are nearly the same, and their reactionary force being exerted at nearly the same point and almost directly against each other,.torsional strain is almost wholly removed. As the arms are vibrated the coil through the core B has a bearing upon the wire b, passing through its center, which resists whatever tendency there may be, through torsional strain or other influence, to shift the axis of the coil, and thus maintains the coil rigidly in position.

An additional advantage of the construction of my spring is its eheapness, owing to the small amount of wire in its single pair of arms, and the ease and rapidity with which it is manufactured with suitable machinery'.

What I claim as my invention,'and desire to secure by Letters Patent, is-

l. A door-spring formed of a single coiled wire the ends of which diverge from the same end of the coil, each arm coming from one and the same coil, forming arms for attachment to IOO the door and jamb, substantially as and for to lshe door audjamb,substantia1ly as and for the purposes set forth. the purposes set forth.

2. A door-spring formed of coiled Wire, one end of which passes through the center of the LEVI M' DEVQRE' coil, forming an axis upon which it may bear, Witnesses: the ends of the Wire diverging from the same H. M. BARNUM, end of the coil, forming arms for attachment DANIEL C. STOVER.