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Publication numberUS145871 A
Publication typeGrant
Publication dateDec 23, 1873
Filing dateJun 4, 1873
Publication numberUS 145871 A, US 145871A, US-A-145871, US145871 A, US145871A
InventorsMarcus T. Hitchcock
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improvement in car-ventilators
US 145871 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

2 Shets--Sheet 1.



Patented Dec.23, 1873.




Specification forming part of Letters Patent No. 145,871, dated December 23, 1873; application filed June 4, 1873.

To all whom t may concern:

Be it known that I, MnRCUs T. HITCHCOCK, of Springfield, in the county of Hampden and in the State of Massachusetts, have invented certa-in new and useful Improvements in Car Ventilator, and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon, making a partof this specitieation.

The nature of my invention consists in va car-ventilator the rectangular frame of which is cast in one piece, with openings at the top for the upper journals ofthe dampers to enter, and with depressions at the bottom, into which the lower journals lie and are covered by protecting-plates, the dampers being east with journals, and one of them having the crank for operating it east therewith, all as more fully hereinafter set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed' to describe its construction and operation, referring to the annexed drawing, in which- Figure l is a perspective view of my ventilating car-register, and Fig. 2 shows a part ofl the damper-frame. Fig. 3 represents the construction of the ventilator with but one damper.

A represents the damper-frame, which is made of cast-iron, with the holes a a in the upper end for the damper-pivots, all made by means of coreprints on the pattern, with ironcores to lie in the prints in the sand. These cores should be made tapering as far as they go into the casting, which will allow them to come out readily. The lower end of the frame A has impressions b made in the frame for the lower damperpivots, and two small caps, B B, which are riveted to the frame to hold the dampers in place. On the frame A is cast another cap, C, which covers the crank-damper, and forms a part of the ornamental part ofthe register. It will be noticed that the whole labor is performed by castin g, with the eXeeption of riveting the caps B B to hold the damper. D represents the center or crank damper, east with the crank E in one piece, the crank being turned to one side, so as to stand with the angle desired, whether open or closed. D D are side dampers, cast with a pivot at each end, while the center damperD has a pivot at the upper end only, and the crank at the lower end. Each of the dampers has a projection, d, at its upper end for the reception of the rivets a: a: on the eonnectingrod G, said rod and rivets being made in one piece.

There only one damper is required, no side dampers or connecting-rod are used, and the frame is made only large enough to contain the center or crank damper. l

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The combination of the frame A, with tapering sockets a a in its top bar, recesses b b in its bottom bar, the dampers D D D', with journals on each end, and the plates B B, riveted to the frame A, all substantially as herein set forth.

-In testimony that I claim the foregoing I have hereunto set my hand this 13th day of May, 1873.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4113230 *Feb 22, 1977Sep 12, 1978Mccabe Francis JRotating blade fire damper
US4219185 *May 16, 1978Aug 26, 1980Prefco Products, Inc.Rotating blade fire damper
Cooperative ClassificationE06B7/084