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Publication numberUS361394 A
Publication typeGrant
Publication dateApr 19, 1887
Filing dateFeb 21, 1887
Publication numberUS 361394 A, US 361394A, US-A-361394, US361394 A, US361394A
InventorsWilliam M. Bowman
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Device for opening and closing furnace-doors
US 361394 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)


DEVICE FOR OPENING AND CLOSING FURNACE DOORS. No, 361 394. l Patented Apr. 19, 1887.

' anva'n tot 2mm 13m UNITED STATES PATENT OFFI E.



SPECIFICATION forming part of Letters Patent No. 361,391 dated April 19,1887,

7 Application filed February 21, 1887. Serial No. 228,382. (No model.)

ToaZZ whom it may concern.-

Be it known that I, WILLIAM M. BOWMAN, I

a citizen of the United States, residing at Palo Pinto, in the county of Benton and State of 5 Missouri, have invented certain new and useful Improvementsrin Devices for Opening and Closing Furnace-Doors; and I do declare the following to best full, clear, and exact description of the invention, such as will enable others skilled iuthe art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

. This invention relates to devices for mechanically opening and closing furnace-doors, and has for its object to produce a simple and compact construction by which the same'can be accomplished in a convenient and efficient manner.

To this end the invention consists in the novel construction and combination of parts, which will be more fully hereinafter set forth and claimed.

In the drawings, Figure 1 is a front view of a furnace embodying my invention. Fig. 2 is a perspective detailview, showing the door open. Fig. 3 is a detail view, on an enlarged scale, of the ball-socket casting which is attached to the door, and Fig. 4 is a detail view of the link which connects the door and bellcrank lever.

The furnace may be of any approved or desired type. That shown is built in, and the front wall, A, is provided with two openings, which are closed by the. hinged doors B B, arranged to swing horizontally. To one side of the hinge, and at a short distance from the axis of the door, the stud or shaft is located, and upon this shaft is mounted the bell-crank lever D, the arms (1 and d of which normally incline to a horizontal plane and extend down ward. The arm (Z is provided with a ballsocket, d, at its end, and the door is provided with a corresponding ball-socket casting, E, which is connected with the socket d by the link F, having a ball at each end fitted in the respective sockets. The link has a universal connection at each end with the door and bell- 50 crank lever, respectively, and the sockets have their adjacent sides slotted or opened to permit the passage of the link, as will be readily appreciated. The end of the arm d is con nected with the inner end of the foot-lever G by the rod H. The foot-lever is located beneath the bed or surface upon which the furnace is built, audits outer end is provided with the foot-rest g, which projects a short ing upon the rear end of the lever, holds the same down and exerts a force to turn the bellcrank lever about its support by pulling down upon the arm (1 thereof, which hasatendency to correspondingly elevate the arm d and hold the door closed without any other fastening 65. devices.

In practice, when it is desired to replenish or view the fire, the attendant treads upon the foot-piece of the lever, which elevates the rear end thereof,'the rod H, and the arm d of the bell-crank lever and depresses the arm (Z and pulls open the door. The pressure being removed, the lever is returned to its normal position by the spring, which also serves to hold the door closed, as previously intimated. 7 5

The opening and closing devices above described can be readily applied to any furnacedoor, as will be readily understood,and is simple and compact in construction and efficient and durable in use.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. The combination, with the door and footlever, of the bell-crank lever connected at one end with the foot-lever, and a link connected at one end with the door and at the other end with the free end of the bell-crank lever by universal joints, substantially as described.

2. The combination, with the door and the go foot-lever, of thebell-erank connected at one end with the foot-lever and having a ball-socket at its opposite end, and the link having a ball at one end fitted in the socket of the lever and having its opposite end connected 5 with the door by a universal joint, substantially as set forth.

3. The combination, with the door and footlever, of the bell-crank lever connected at one end with the foot-lever and having a ball- :00

socket at its opposite end, the ball'soeket castlever to a normal position, closing the (1001' and :ing secured to the door, and the link having I holding it closed, substantially as described. 10

a ball at each end fitted in each of said ball- Intestimonywhereof I affix my signature in sockets, substantially as specified. presence of two witnesses.

5 4. The combination of the (1001, the foot WILLIAM M. BOWMAN.

lever, the bellcmnk lever connected at one en (1 Witnesses: with the door and the other end connected with T. \V. LOVELACE,

the f00t-levcr, and the spring forrcturning the 1 DAVID COOPER.

Referenced by
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US4970638 *Oct 31, 1988Nov 13, 1990The United States Of America As Represented By The Secretary Of The Air ForceControl of unknown systems via deconvolution
Cooperative ClassificationF23M7/00