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Publication numberUS980471 A
Publication typeGrant
Publication dateJan 3, 1911
Publication numberUS 980471 A, US 980471A, US-A-980471, US980471 A, US980471A
InventorsHenry C Zenke
Original AssigneeHenry C Zenke
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Ventilating system for factories, printing-offices, and the like.
US 980471 A
Abstract  available in
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Description  (OCR text may contain errors)


980A71 Patented Jan. 3; 1911.

urn earns arena: FIGE.

nan-arr c. znivnn, or new roan, u. r.


To all whom it may concern:

Richmond Hill, Queens borough, New Yorkcity, in the State of New York, have made certain new and useful Improvements in Ventilating Systems for Factories, Printing- Ofiices, and the Like, of which the following is a specification.

My present invention relates to systems of ventilating large spaces in which the demand. varies greatly, so that at one time forced ventilation is necessary; while at others it is not required.

It is desirable that the same ducts and out lets be used at all times; but when natural draft is employed, the stationary fan obstructs the air-way to such an extent as to make the system inefiicient. To accomplish the purposes of the invention, therefore, I provide means for natural ventilation and also means for forcedventilatron; and com-v bine with them, means for shutting ofil refferably automatically) the natural raft when the forced draft is started, such means being also preferablyautomaticall reversilole, so thatwhen the fan shuts own, the natural draft is shunted around the fan, leaving the air-way entirely unobstructed.

Other details of the invention'will a pear in the description; but it is obvious t at it resides, not so much in the various ducts fans and dampers, all of which are old and well-known, as in the system by which they are so combined as to secure an eilicient renewal of the air in the space to he ventilated.

In the drawings I have shown what is known as an exhaust system; but the invention, by ordinary constructive skill, may be carried out by the plenum system, or by the two combined. Such changes, being within.

,the skill of competent mechanics,- I have not considered it necessary to illustrate or describe.

In the drawings, F i ure 1 is a diagram matic section of part 0% a building to which my invention has been applied; Fig. 2 is a diagram of another arrangement.

In Fig. 1, A is a duct or flue at the side of the building, forming a common discharge for the various rooms or floors. Each of the latter is, in the case illustrated, provided with a duct B, B &c., communicating with the main flue A; the ends of the ducts B B are turned up at b, b a short distance into Specification of Letters Patent.

v Application filed Aprils, 1909. Serial No. 4185343.

the due so that lower floors or rooms will not discharge foul or heated air into the ones above. Upon one of the floors I have shown a hood B on another the pipe or duct B is perforated at a c, &c.; these are typical ways of collecting the foul air. At C is shown in diagram a suction fan for exhausting the air as occasion arises an inlet pipe A? connects the fan with the flue, and an outlet Sips A discharges into the flue the air rawn through t weighted damper, the weight d of which is of just suillcient amount, and is carried upon an arm set at such an angle, as to hold the Patented Jan. 3,. 19 11.

e fan. At D is shown a windy s y, the air-waybeing entirely unobstructed and changes in pressure therein having no etle'ct upon the damper. on in normal position thisdamper closes the outlet pipe A of th outward upon the hinge d it closes the flue A below the discharge opening.

The operation is as follows: So long as the fan is not running, the damper D lies flat against the wall of the flue, and the natural air-current is wholly unobstructed; but when the fan starts, the blast through the dischar e-pipe A swings the damper across the fIue'A, and the suction holds it closely in lace so long'as the fan continuesto run. en the fanstops, the damper resumes its upright position.

In Fig.2 I show a separate duct or flue E for the natural draft, the automatic damper being mounted therein adjacent to e fan; bun-when swung the pipe A, which forme'the impel of the fan. In this arrangement; inasmuc as the damper is not subjected to the blast of the fan and operates only by suctidn, I place upon it 9. lug or projection d; which serves to cause the end or lip of the damper to reject slightly into the air-way. When the lhn is started, the air-current reverses in'the flue E above the pipe 18,, thus depressing the dam r and closing fiue E, the suction holding own the damper aslong as the fan runs, as in the construction shown in Fig. 1. 1

This is not so good a construction as that.

of Fig. l, but is operative and may be used I when occasion demands; it is often useful in old buildings, or in other cases in which it is difiicult to find room. l

Having thus described my invention, what I claim and desire to protect by Letters-Patent of. the United States is H 1. A. ventilating system such; as described, I comfp'rising means for ventilating by natural dra t,

"means for ventilating by artificial draft, and means for cuttin draft when the artificial raft is started; such last-named means automaticall actuated by the starting of the artificial raftr 2. A system of. ventilation comprising means for producing a natural draft, means for produclngair artificial draft, and means,-

I such damper normally closing one of the fan-pipes when in its normal position, leaving the flue unobstructed, but when operated acting to close the flue between the inlet and outlet pipes of the fan; whereby,

when the damper'is in normalposition, the

flue maintains a natural draft, and when the fan is started,=the damper. 'chts it ofi.

4. In a ventilat ng system, thecombination, with a fan having inlet and outlet pipes and a flue with which such pipes communioff the natural of a flue or duct communicating WltlL cate, of a damper located in the flue between the inlet and outlet pipes, and arran ed when inits normal position to leavethe ue substantially unobstructed.

5. Ina ventilating system, the combination, with a fan having inlet and outlet pipes and a flue with which they communicate, of a weighted damper located in the flue and normally closing the outlet of the fan, leaving the flue unobstructed; the weight and damper being so proportioned and arranged that the starting of the fan will cause the damper automatically to close the flue between the outlet :lndinlet pipes.

pass, and means or closing the by-pass at desired times; whereby the natural draft may roceed by the by-pass independent of the ail-way.

7 In a ventilatin system, the combination, with a flue, a an,. and a by-' ass, of a weighted damper controlling t e draft through the by-pass, and means for auto- .matically operating the damper by the starting and stopping of the fan.



T: J. JOHNSTON, Invme M. Oimmon'r.

- "6. In a' ventilatin system, the combination, with a system 0 pipes serving to ventilate the desired s ace, of 'a fan and a by-

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2569319 *Jul 6, 1948Sep 25, 1951Krug Oliver JVentilating apparatus
US2586797 *Jun 21, 1947Feb 26, 1952Otis Elevator CoFire protection system
US2700927 *Aug 11, 1949Feb 1, 1955Jordan Afton LAutomobile air conditioner
US2738785 *Mar 27, 1953Mar 20, 1956Alfred Mclane JamesAir heating furnace
US2778033 *Jul 11, 1955Jan 22, 1957Majauskas Charles JVentilator for water closets
US3051158 *Nov 3, 1960Aug 28, 1962Samuel Stamping & Enameling CoVentilating system for a cooking oven or the like
US4922808 *Feb 16, 1989May 8, 1990Smith Stephen DRadon and other gas ventilator
US5496214 *Mar 1, 1995Mar 5, 1996Marcreigns; AnthonyApparatus for removing smoke
Cooperative ClassificationF24F7/06