US8704A - Door-spring - Google Patents

Description

HY. HoorrsTRAssnRANnA. `MassoN, or` PHILADELPHIA PENNSYLVANIA;

` DoorasrnrNG.

Speccatin of Letters Patent 1\To` 3,704, dated ebruaQry 3, 1852.

` To all whomfzlt concern:

Be it known that we,ljlnvnr` HOCH- s'raassnr: y and ABRAHAM MassoN, of the cit-y1 and county Philadelphia, `State of Pennsylvania, have invented aM new and Improved Door-Spring for the Purpose of Closing Doors byfthe Power of `Said Spring; and we hereby declare thatthe following is an exact description thereof, reference being had to the accompanying ,draw-f rings and to the letters" ofreference marked t n n f i durabilityf-as 1t` cannot lose its elasticity thereon. y. y

The nature of our invention consists of the application of a curve to be fastened to the door-frame in such position as hereafter described) to and in connection with a spring with rollers attached to one end, which end moves in and on the curve, for the purpose of having the spring act more powerfully on the door when about shut than when open; the other end of the spring` to be placed in an iron on the door; which iron can be permanent or movable as may be preferred. Although the spring may have its greatest tension when the door is open, it acts with less power because the end of the spring` with the rollers attached is by the action of opening the door thrown in toward the centerl ofthe hinges or axis of the door; and in and by the action of closing the door, the same end of spring moving in the curve is thrown out from the center of the hinges or axis of the door, causing the spring to act more powerful. Although the tension of the spring is lessened, because it is then a considerable distance from and back of the center of t-he hinges, or axis of the door. To explain more fully: If a spring of the kind here described should have one end placed directly on a line with the hinges or door-frame, and the other end attached to the door, it is evident that it would work precisely the same and with the door; but ifv you attach the spring out of the line, either out from orback of the center of the hinges, the spring .will meet with resistance and will assume an elliptic form, and its tension or power will tend to close the door; now if we can throw the spring out from the center,` by the action of the door when it is closed or closing, and in toward the center when opening, we have the greatest power when closed or nearly so, and the lesser power when open. This arrangement has the following advantages, viz: lst. Persons `passing 1n or thrown back farther.

i out, usually leave `the door partlyopen, and

the springs now in use will not close it, or if 'made` of sufficient power,` it; will be so great as `to shatter the door.` Qnch This spring can be put onlany partof a door, whichfdoes not require to be thrown` back farther thana right angle with the doorframe, either on top at midway or atthe bottom of the door-rif onftop it can be 3rd. It can be taken off and put onwith little trouble. `tth.` Its like a coil or spiral spring. 5th. Itscomparative freedom from friction and noise.

`To enable others skilled in the art to make and use our invention, we will proceed to describe its construction and operation.

We construct our spring of tempered steel, flat and straight in shape (other shapes will do) of width to suit the opening or divison in the curve, its thickness and length will be proportioned to the size of the door and power required. On one end of the spring we turn an eye in which we insert a pin, on each end of the pin we fasten a roller with a groove turned therein, for the purpose `of preventing them from slipping out of the curve.

The above described spring is shown in sectional drawing A. The curve we make of metal of form similar to sectional drawing D, having an opening or division in its center to admit the passage of thespring as in perspective drawing I. We place the curve on the door frame, so that the center of the lower or inner part of the curve (see sectional drawing D, Figure 2) or the cen ter of the rollers when in that part of the curve will be about a quarter of an inch back and from the center of the hinge or axis of the door if the hinge projects out farther than usual, then block the curve out so as said center will be on a line with the center of hinges as above described. .After the curve is secured as above shut the door and place the end of the spring with the rollers attached in and on the outer part of the curve. The other end of the spring place in the iron or rack attached to the door for that purpose which rack is shown in sectional drawing G, which can be used for the purpose or some similar device, which can be placed at one-half or threequarters of the width of the door distant` from the center of the hinge or axis of the iio door, the length of the spring yto be made to correspond, which must be one-eighth of an inch longer than its bearing place on the rack, at most not more than one-quarter of an inch as the more the spring is bowed or approaches the elliptic form, the less power it exerts when the door is closed. Now when the curve and spring is placed as above and as shown in the drawing E and the door is closed the spring exerts its greatest power o1' nearly so, because. the end in the curve 4stands out farther from and back of the center' of the hinges or axis of the door than when the door is open. In opening the door a short distance, which distance can be regulated vby the shape of the outer part of the curve, the end of the spring in the curve, moves in the curve toward the center of the hinge or axis of the door (as shown in sectional drawing F) which lessens the power of the spring because it is nearer the center or axis of the door.

We do not claim the straight piece of steel for a spring as new, neither do we claim having the spring act most powerful when the door is closed, as new.

What we do claim as new and our nvention or improvement and desire to secure by Letters-Patent, is

The application and mechanical arrange-`

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