US2521764A - Marine type draft adjuster - Google Patents

Description

Sept. 12, 1950 A. J. WARD MARINE TYPE DRAFT ADJUSTER Filed June 28, 1945 gwumm ARTHUR J. WARD CLOTH SLEEVE Patented Sept. 12, 1950 MARINE TYPE DRAFT ADJUSTER Arthur J. Ward, Washington, D. 0.

Application June 28, 1945, Serial No. 602,142 s claim's. (01. 236-45).

(Granted under the act of March a, 1883, as

amended April 30, 1928; 370 O. G. 757) This invention relates to a marine type draft adjuster with automatically self-adjusting parts. The present improvement will be described in connection with conventional oil burning galley range and bake oven assemblies aboard ship. It provides a means for maintaining a predeterterference by either the pitch or roll of the vessel. It permits response to pressures and oper ating conditionsin substantially the same man ner as in a shore installation.

mined draft regardless of inside and outside pressures on the adjuster or of the ships pitching and rolling motions. As will be understood, pitch refers to longitudinal rising and falling motion of vessels whereas roll refers to the transverse motions. The outside pressures on the adjuster damper will of course be changed by the opening of galley doors and the like and the damper respondsautomatically to these changes.

Prior draft adjusters, while reasonably satisfactory for shore installations, are all characterized by being adversely affected by the ships motion. For example, in rough weather a ship may roll 45 and more. Under these conditions the pressure responsive dampers of prior adjusters will swing in response to motion as well as pressure, and hence give a fluctuating draft. This renders the usual pressure calibration completely inaccurate and ineffective.

The present invention overcomes these difficulties by constantly maintaining the predetermined amount of draft. This result is accomplished by a system of pivots, counter weights and anti-friction bearings. The device includes a cylindrical member for making a stovepipe connection with the conventional smokepipe. A pair of brackets extend longitudinally of the member and provide pivots for the adjuster unit. The body or housing v of the unit is counterweighted on the pivots regardless of the ships motion. A flexible flameproof or fireproof fabric covers the portion between the unit and the cylindrical connection to permit response to the action of the counterweight.

The adjuster body is conveniently a sheet metal housing and contains a counterweighted draft adjusting damper which is calibrated in a known manner. In short, the position and size of the weight determines the damper opening and the efiective draft pressure. The damper is pivotally mounted at opposite sides in the novel weighted frame member which rides on a ball or roller bearing race.

The combination of the anti-friction bearings and weights insures a position substantially vertical to the earths center at all times. It will be seen that this construction avoids irregular bearing pressures on the damper pivots and maintains the calibration of the damper without in- An object of the invention is to provide a marine type draft adjuster unit which will be self compensating for the pitch and roll of a vessel..

Another object is to provide a draft adjuster. with a system of pivots, weights and anti-friction. bearings which will maintain the adjuster damper" support in vertical position during, a rough sea. These and other objects of invention will be manifest from a consideration of the following description, claims and drawings in which:

Fig. 1 is a schematic view of a galley bake. oven and range assembly including theimproved unit joined to the smokepipe.

Fig. 2 is a side elevation of the improved aha;

Fig. 3 is a front view of the improved unit.v I

Referring to the drawing, Fig. 1 shows galley ranges II), II and bake oven 12, all conventionally connected to smokepipe I3. The improved draft control adjuster is attached at one end of the.

smokepipe l3 as shown. It consists of a cylindrical connection member M on which brackets 15 and I6 are secured asby rivets IT. The brackets l5 and I6 carry pintles as at 18 on whichthe draft adjuster housing pivots. A fireproof or fiameproof fabric 2! cemented and riveted to member l4 and housing 20 provides a flexible draft passage. The fabric 2| is closely woven or fabricated and treated to make it substantially airproof. A circular member 22, L-shaped in cross section, and ring 23 when fitted and secured together maintain the ball bearing race 24 in position to support the adjuster frame 25 counterweighted at 26. The counterweight 26 will always assume the lowermost position regardless of pitch or roll. Adjuster frame 25 supports pintles 21 and 28 for the calibrated pressure responsive damper 29 with conventional calibrated weight 30.

The damper housing 2!) is counterweighted at its sides to compensate for the weight of the damper race and weight. These counterweights 3i and 32 are screw threaded on brackets 33 and 35 so as to cause the center of gravity of the unit to be just below the pivot points l8 and i9. This will permit pivotal movement and cause the adjuster housing to remain upright substantially along the vertical.

It will be seen that I have compensated both for pitch and for roll in vessels. The present improvements are obviously adapted for use on trains, aircraft or other installations subject to similar motions.

This invention may be made or used by or for the Government of the United States for governmental purposes without the payment to me of any royalties thereon or therefor.

What Iclaimis: j

1. Ina draft adjuster, a; smoke pipe conductor, a circular damper-housing pivotally mounted on 4 means, a flexible connection between the said connector member and housing, a counterweight on the housing, an anti-friction race positioned in the housing, a self adjusting weighted member rotatably mounted on said race and a pressure responsive draft control member pivotally supported on said weightedmember.

#7.;In a draitradjusterifor use comazship, a pivoted circular damper housing, a circular ball said connector, a circular anti-friction race pohearing anti-friction race, a Weighted S j sitioned in that housing, a. self-adjusting weighted member rotatably mounted on said anti-friction race and a pressure responsive damper member movably supported on said weightedmember.

2. In a draft adjuster, a smoke pipe connector,

a circular damper housing pivotally mounted on said connector, a circular anti-friction race secured in the housing, a self adjusting weighted member rotatably mounted on said anti-friction race and a pressure responsive calibrated damper member pivotally supported on .said weighted member.

3.In a draft adjuster, a smoke pipe connector, a damperhousing pivotallymounted to said Vconnector, said pivoted damper housing having its center of gravitybelow the, pivot axis, an .antifriction race positioned in the housing, a self adjusting weighted member rotatably mounted on-said anti-friction. race and a .pr.essure.responsive damper member pivotall r supported on said weighted member.

'4. In a draft'adjuster, a smokepipe connector member, a'support means on said'connector member, apivoted damper housing on the support means, 'an:anti-friction race secured to thehousi g, a self-adjusting weighted member rotatably mounted on said race and a pressure responsive draft control membersupported onsaid weighted member.

5. ,In "a draft adjuster, a smokepipe connector membenasupport meanson'saidcconnector,membe1 ',--a pivoted damper hOliSiIig on the support means and'a flexible vconnection'forming an air passage betweentthe smokepipe connection. memher and thehousing.

"6.In a draftadjuster, a smokepipe connector member, a support means on said connector member. apivotejd damperhousing on the .support ing rotatable circular damper frame, a, connector T131138, :a flexible rair-tight fabric connection, an adjustable counterweight on the pivoted circular damper "housing and a counterweight on the weighted self-adjusting rotatable circular damper frame to insure the weighted self-adjusting rotatable circular damper frame holding the piv- -.otedcalibrated;pressure responsive circular damp- .rer' in Fan .upright- ,or operating position regardless of the pitch or roll of the ship.

.8. -In adraft. adjuster, apivotedcircular. damper housing, a circular ball bearing antiefriction race, a weighted. self adjustingrotatablecircular damper iframe, .a .connector pipe, a flexible airtight 'fabric connection, anadjustable counterweight on the pivoted circulardamper housing, a counterweight onthe weightedself-adjusting rotatable .circular damperirame and twosupports between the connector pipe an'dthe pivoted circular damper housin which are rigidly fastened to the connector pipe .and pivotally fastened to'thepivoted circular damper housing.

ARTHUR. J. WARD.

REFERENCES CITED The following references are of record in the file .of. this patent:

UNITED STATES PATENTS Number Name Date 1,628,643: Breese '"May'17, 1927 19471251 Dressler Feb. 13,1934 1,988 539 "Bowersox Jan. 22 1935 2,276,728 Johnson et a1 "Mar. '17, 1942 FOREIGN PATENTS Number Country Date 1373;814 Great Britain June 2, 1'932 Certificate of Correction v Patent No. 2,521,764 September 12', 1950 ARTHUR J. WARD It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 3, line 8, for the Word conductor read connector;

and that the said Letters Patent should be read as corrected above, so that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 28th day of November, A. D. 1950.

THOMAS F. MURPHY,

Assistant Gammz'ssz'oner of Patents,

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