US555652A

US555652A - Israel frank miller

Info

Publication number: US555652A
Authority: US
Publication date: 1896-03-03
Anticipated expiration: 1913-03-03

Description

(No Modgl.)

I. P. MILLER.

AUTOMATIC SELF CLOSING DOOR.

Patented Mar. 3, 1896.

UNITED STATES PATENT OFFICE.

ISRAEL FRANK MILLER, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO LEUTELLER H. TOURTELLOTTE, OF SAME PLACE.

AUTOMATIC SELF-CLOSING DOOR.

SPECIFICATION forming part of Letters Patent No. 555,652, dated March 3, 1896. Application filed December 12,1895. Serial No. 571,890. (No model.)

To all whom it may concern.-

Be it known that I, ISRAEL FRANK MILLER, of Boston, county of Suffolk,and State of Massachusetts, have invented an Improvement in Automatic Self-Closing Doors, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention has for its object to improve the construction of automatic self closing doors especially designed for mills and other buildings.

Prior to this invention an automatic selfclosing door has been made which consisted of a door arranged to slide on a declining track to close automatically, and as a means for holding it open a cord was connected to the door which passed over a pulley and thence to a fusible link, and another cord was connected at one end to said fusible link and had attached to its opposite end a weight of a size substantially to balance the door. Thus the weight held the door open, but in case the fusible link melted, the weight became detached or disconnected from the door just as if the cord had broken, thereby permitting the door to close automatically. In case the fusible link melts, the door is expected to start and close by gravity, but it oftentimes sticks and does not start at all, although if once started its action is quite certain. The door is usually opened wide, and the weight at such time rests upon the floor; but if it is desired to open the door part way careful adjustment of the weight is necessary in order that the door may remain in such position, as the friction to be overcome varies.

In accordance with this invention the door is arranged and adapted to slide on a declining track to close automatically, and to hold the door open a cord is provided which is quite independent of the door and which is connected at one end with a pivoted weight, so arranged as to turn on its pivot when released and in falling to strike the door a severe blow and thereby materially assist in starting it. The other end of the cord is at tached to the fusible link, and another cord is provided, one end of which is attached to said fusible link, and in case of a single door its other end is attached to a fixed point; but

in case of a double door this latter cord instead of being attached to a fixed point will be attached to another pivoted weight located adjacent to the other door, and when the link melts both weights will fall and strike the doors. The double doors are arranged to slide on tracks which decline toward each other, and each door will have a sheave-plate'that is, a plate carrying two or more sheaves over and under which the cord passes-such a device frictionally connecting the door with the cord, permitting the door to be moved along the cord in either direction freely, yet to remain in whatever position it may be left.

Figure 1 shows in front elevation a double door provided with automatic self-closing devices embodying this invention; Fig.2,a modification showing my improved devices applied to a single door; Fig. 3, a detail of the pivoted weight, and Fig. 4 a detail of the bracket to which the weight is pivoted.

The doors co 1) are arranged and adapted to slide upon tracks a b which decline toward each other, the hangers and tracks being of any desirable construction. A cord 0 is provided, which, as shown in Fig. 1, is made quite long and has at the middle a fusible link cl, which is so arranged as to occupy a position about midway the arch. The ends of the cord 0 are attached to pivoted weights e. These weights are made as bell-crank levers, pivoted at e, each having a block e upon one of its arms, while its other arm is connected with the cord. A bracket f is secured to the wall and is adapted to serve as a pivotal support for the weight.

A sheave-plate g is secured to each sliding door, bearing two or more sheaves g, over and under which the cord 0 passes, as represented in Fig. 1. This sheave-plate connected with the cord, as shown, serves to connect the door frictionally with the cord, permitting it to be moved along freely, yet be held at whatever point it may be placed. The grooves in the sheaves g are made quite shallow, so that in case the fusible link melts and the cord drops it will readily slip off or out of engagement with the sheaves.

When the fusible link melts, the pivoted weights will be released and turning on their pivots will strike the doors a severe blow, assisting in starting them along the tracks.

The blocks e have upon their rear sides projections 0 which engage the edges of the doors when the weights are released.

It will be seen that the doors are not directly connected with the cords, so that when they close by their automatic action they do not in any way draw the cord along; also, that the doors may be easily moved along the cord and remain in any position in which. they may be placed, and that when the weights are automatically released they assist in starting the doors along the tracks.

As contrasted with prior constructions, the weights do not act to balance the door, but to give suitable tension to the cord, so that the friction 011 the sheaves y will be sullicient to hold the door in whatever position it maybe placed.

In case of a single door one end of the cord will be attached to a fixed point, as represented at h, Fig. I

I claim- 1. A door adapted to slide upon a declining track to close automatically, combined with a cord having a fusible link, supports for each end thereof, and a friction device for connecting the door with said cord, permitting it to slide along the cord and to remain in whatever position thereon it may be set, substantially as described.

2. A door adapted to slide upon a declining track to close automatically, combined with a cord 0 having a fusible link (7, and a friction device, such as a sheave-plate secured to the door and having two or more sheaves, over and under which the cord passes, substantially as described.

A door adapted to slide upon a declining track to close automatically, combined with a cord 0 having afusible link (1, a weight for holding the cord taut, and a friction device, such as a sheave-plate, secured to the door, and having two or more sheaves over and under which the cord passes, substantially as described.

at. A door adapted to slide upon a declining track to close automatically, con'ibined with a cord 0 having a fusible link cl, means for connecting the door with said cord, and a pivoted weight to which one end of said cord is attached, adapted when released to fall. and strike the door, substantially as described.

5. Two doors adapted to slide upon tracks which decline toward each other, combined with a cord 0 having a fusible link (I, pivoted weights attached to the ends of said cord, and afriction device, such as a sheave-plate having two or more sheaves, for connecting each door with the cord, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ISRAEL FRANK MILLER.

\Vi tnesses:

13. J. Novas, 11. ll. DAVIS.