US406025A - Door-spring - Google Patents

Description

(No Model.)

B. A. OALAHAN.

DOOR SPRING.

No. 406,025. Patented July 2. 1889..

PETERS. Phm-quw m. Washinglan.

UNITED STATES PATENT OFFICE.

EDwAED A. CALAIIAN, on BROOKLYN, NEW YORK- DOOR-SPRING.

SPECIFICATION forming part of Letters Patent No. 406,025, dated July 2, 1889.

Application filed April 15, 1889.

To all whom it may concern:

Be it known that I, EDWARD A. CALAHAN, of Brooklyn, in the county of Kings, State of New York, have invented certain new anduseful Improvements in Door=Springs, of which the following is a specification.

My invention relates to that class of doorsprings in which a vertically-arranged rod or coiled spring is employed, the tension 011 the spring being obtained by torsion or twist. Heretofore with the ordinary torsion rod springs a wrench or key separate and detached from the spring or its attachment by which it is secured to the door has been employed, and a toothed wheel and detent have been used to hold the spring with the twist or torsion upon it. IVith such an arrangement it has been difficult to get any very nice adjustment of the spring, for the reason that it must always be twisted to"sueh a position that the detent will enter a tooth of the wheel. In the springs of this class now upon the market, it is necessary to turn the detent laterally out of engagement with the wheel, apply the wrench to the spring, and then turn the detent back into a notch in the wheel. Such a construction, it is true, gives the capacity of adjusting the spring to either open or close a door, but it is inconvenient and undesirable, and if an ordinary pawl and ratchet were employed the spring could, of course, only be twisted in one direction. Coiled springs acting analogously to the torsion-rod springs and adjusted in a somewhat similar manner are open to the same objection, and so far as I am aware are adapted to be adjusted in one direction only.

In my improved apparatus I effect the adjustment of the spring by a worm and wheel. It will therefore be obvious that by the rotation of the worm in either direction the spring may be twisted to its fullest extent in either direction and that the utmost nicety of adj ustment may be attained, and since the spring may be twisted in either direction of course it may be equally well adjusted to either open or close the door.

In the accompanying drawings, Figure l is a view, partly in section, showing a coiled Serial No. 307,307. (No model.)

spring with my improved attachment applied to a door. Fig. 2 is a sectional view on the line 2 2 of Fig. 1, and Fig. 3 shows a torsion-rod spring with my improved attaelt ment.

One end of the spring A, whether it be a coil-spring or torsion-rod, is attached to the door, as usual. The other end (in the way in, which I have chosen to illustrate my invem tion) is squared orangular and passes through the eorrespondingly-socketed hub of a toothed wheel a, mounted between lugs or plates Z) on a plate or support B, screwed to the doorframe. In this instance the plate 1; is socured to the frame by the same screws (1 that hold in place the bracket (1, in which the worm D has its bearing. The worm shaft is provided with a cross-pin or thumbpiece d, by which it may be rotated in either direction, and also with a notch, so that an ordinary screw-driver may be employed to turn it. It is plain now that by rotating the worm any desired torsion or twist may be given to the spring, and that the adjustment may be made with the utmost delicacy.

By rotating the worm in one direction the spring may be made to close the door with any desired force. 13y reversing the direction of the worn], the spring may be readily brought to the neutral point, and by continuing its movement the direction of tension upon the spring may be changed, so that it will tend to open the door with any desired force.

If it is desired that the door be entirely relieved from the action of the spring in any direction, the screws 0 may be removed and the bracket 0 and worm D swung down out of engagement with the wheelnvhen the screws may be replaced.

I claim as my inventionl. The combination, with the door-spring, of the worm and wheel ad jnsting devices for giving a torsion or twist to the spring.

2. The combination of the Spring, the plate 13, the toothed wheel with which the spring is connected so as to turn with it, and the worm engaging the wheel to turn it in either directii'm.

3. The combination of the spring, the plate or support B, the wheel, the worm, the bracket in which the worm has its bearing, and the screws 0, for securing the bracket in place, whereby upon the removal of the screws the bracket and worm may be turned down to disengage the worm from the wheel.

In testimony whereof I have hereunto subscribed my name.

EDWVARD A. CALAHAN.

Witnesses:

EDWARD O. DAVIDSON, M. J. KELLEY.

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