US2356325A - Ventilator - Google Patents

Description

vAug. 22, 1944. n H.- R. LARsl-:N

VENTILATOR Filed April 29, 1942 INVENTOR.

ATTORNEY Patented Aug. 22, 1944 VENTILATOR Holger R. Larsen, Brooklyn, N. Y., assignor to J. J. Fisher Co. Inc., Brooklyn, N. Y., a corporation of New York Appiicann April 29, 1942, serial No. 441,041

3 Claims.

The present invention relates to ventilators and has particular relation to a system of adjust-- able lcuver-dampers of sheet metal construction, intended primarily for use in connection with a conventional ventilator provided with stationary or xed louvers.

Louver ventilators presently in use are, in general, of two conventional types, i. e. (i) the static-nary or fixed louver type in which all louver vanes are secured immovably at a xed angle, and (2) the adjustable'or movable type in which all louver vanes are pivoted at the ends and can be adjusted to various angles by means of operating devices. Under certain circumsteances, it is desirable to control the volume of air admitted through or exhausted from a conventional, stationary type of louver. Accordingly, in order to accomplish such adjustment, the conventional solution has been the installation of hinged shutters in back of the louver unit, wherever accessibility and available space permitted of such installation. Inaccessible locations, such as vent ducts, or where space could not be found, no adequate means of air control has been employed.

The present invention has for one of its objects to obviate the above mentioned diiculties and contemplates a damper unit, consisting of a series of auxiliary vanes or blades installed in back of a conventional stationary lo-uver. Said damper blades are arranged in spaced parallel relation and are secured to each other by metal straps, so as to permit all of the blades to move upwardly or downwardly simultaneously, thus opening or closing the fixed air-spaces between the vanes of the conventional, stationary louver, and providing, when closed, a positive water seal against driving rain or snow.

The present invention further contemplates, as another object thereof, an operating or adjustment device revolving upon a xed center around which an eccentric slot engages the operating arm in such manner as to permit the damper blades to remain in any desired position, from fully open to fully closed, without the use of gearing or counterbalancing features.

The foregoing and other objects and advantages will appear from the following description of typical embodiments of the invention shown 3 is a View similar to Fig. 2 with the damper unit shown in closed position;

Fig. 4 is a fragmentary rear elevation, on a larger scale, of the damper unit showing the operating arm and adjusting device;

Fig. 5 is a fragmentary section on line 5 5 of Fig. l, showing a conventional, stationary louver, having the damperV unit installed in a sliding groove attached to the louver frame.

As shown in the drawing, a vertical series of sheet metal damper blades "I are held together horizontally and in spaced parallel relation by means of two vertical metal bands S which operate in grooves 9a of vertical members 9 at tached to the back of the frame F of a conven' tional, stationary louver ventilator i@ or in other manner acceptable to the purpose. Said Ventilator comprises a series of vertically spaced stationary louver blades lila inclined upwardly and rearwardly from the front of ventilator frame to the rear thereof. Said blades are made of sheet metal and each has at its front and rear ends downwardly and upwardly extending flanges Ib and Ido, respectively. VThe free end portion of each of said flanges is reilexed inwardly to provide the inwardly projecting lips Illd and Iile on flanges tec and iSd, respectively. It will be understood that louver blades Illa, extend horizontally for the full width of the frame and that flanges Ib and Ic and their lips Iild and Ille are coextensive in length with their companion louver blades.

Each damper blade I has a lower flat planar flange I I inclined forwardly and downwardly at the same angle as louver blades Illa., the upper surfaces of said flanges II being parallel to the lower surfaces of blades 'I. Flanges II extend for the full lengths of their companion blades 1. Said flanges abut the lower surfaces of the adjacent louver blades Illa, when the damper is in open position as shown in Fig. 2. When the damper is closed, as shown in Fig. 3, said blades 'I close the spaces between adjacent blades |00. at the rear of the Ventilator and the flanges II -provide a water-shedding structure. In addition to the water-shedding function of flanges I I, the latter functions to reinforce their companion blades 'I.

An operating arm I2 is riveted or otherwise secured to two or more of the damper blades 1, at approximately the middle of their length. An engaging pin I3 is attached to the free end of the operating arm I2 in such manner as to be perpendicular to same. Pressure exerted on the engaging pin I3 in an upward direction will cause the entire connected series of damper blades 1 to slide upwards in a unit simultaneously, thereby opening the air-spaces in the conventional louver unit I 0. Reversing the direction of pressure will cause the damper blades 'I to slide downward, thus closing the aforementioned air-spaces.

An adjustment device consisting of a heavy metal plate I4, provided with an opening lever arm I and a closing lever arm I6, revolves about a fixed center I'I through which passes a bolt I8 acting as a pivot pin and securing the adjustment device I4 to the bottom flange ISa of the louver I D. The metal plate of the adjustment device I4 has, pierced through its thickness, an eccentric slot I 9 into which is inserted the engaging pin I3 of the operating arm I2. Operating chains 2! depend from opening arm I5 and closing arm I6 by means of which the desired position of the damper blades I can be obtained. It will be observed that pin I3 is disposed centrally of the lengths of blades 1 and above pivot pin I8 in all vertical positions of adjustment of said blades 'I. By reason of this construction and arrangement adjusting plate I4 remains at all times in the adjusted position to which it is turned and requires no fastening to hold it in its adjusted position.

It will be understood that the sliding motion contemplated in opening or closing the air spaces between the fixed louver vanes is not subject to clogging from ice and snow that, when closed, driving rain will ow forward and outside rather than in back of the louver, and that the elimination of pivots and hinged operating rods will reduce all noise and rattle caused by wind and vibration. It will be understood, that insectexcluding screens (not shown) may be attached directly to the back of the sliding blades without interfering with the operating device.

While I have shown and described the preferred embodiment of my invention, it will be understood that the latter may be embodied otherwise than as herein shown or described and that in the illustrated embodiment certain changes in the detail of construction and in the arrangement of parts may be made. Therefore, I do not wish to be limited to the invention as herein specifically shown or described except to the extent which may be required by the scope of the appended claims.

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

1. In a ventilator comprising a frame having a plurality of vertically spaced louver blades inclined upwardly and rearwardly from the front to the rear of said frame and extending continuously from the front of said frame to the rear thereof, a damper unit mounted on said frame at the rear thereof for sliding movement vertically of said frame from an upper position in which the ventilator is open to a lower position in which the ventilator is closed, said damper unit comprising a plurality of Vvertically spaced blades having vertical portions for closing the spaces between adjacent louver blades at the back of the ventilator, in said lower position of said damper unit, and provided with dat planar flanges inclined and projecting forwardly and downwardly from the lower ends of said vertical portions, the upper surfaces of said flanges being parallel to the lower surfaces of said louver blades.

2. In a ventilator comprising a frame having a plurality of vertically spaced louver blades inclined upwardly and rearwardly from the front to the rear of said frame and having upwardly extending vertical flanges at their rear ends, respectively, a damper unit mounted on said frame at the rear thereof for sliding movement vertically of said frame from an upper position in which the ventilator is open to a lower position in which the ventilator is closed, said damper unit comprising a plurality of vertically spaced blades having vertical portions for closing the spaces between adjacent louver blades at the back of the ventilator, in said lower position of said damper unit, said vertical portions overlapping said vertical flanges, respectively, of the louver bladesl said damper blades having flat planar flanges inclined and projecting forwardly and downwardly from the lower ends of said vertical portions, the upper surfaces of said flanges being parallel to the lower surfaces of said louver blades and abutting the lower surfaces of said inclined louver blades when the damper unit is in open position.

3. In a ventilator which is provided with a frame and a plurality of vertically spaced louver blades fixed in said frame, a damper unit comprising a plurality of vertically spaced blades slidably mounted in said frame, each of said blades having a vertical portion and a portion inclined downwardly and forwardly from said vertical portion for engagement with the upper edge of a companion louver blade, means mounted in said frame for adjusting said damper unit, in said frame, and means fixed to said damper unit centrally thereof in non-movable relation thereto and depending therefrom for engagement by said means for adjusting said damper unit.

HOLGER R. LARSEN.

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