US532439A - Fly-screen for windows - Google Patents

Description

M. H. BLAISDBLL. FLY SCREEN FOR WINDOWS,.DO0RS,

(No Mode@y ANo. 532,439. Pa'tented Jan. l5, 1895.

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Wala/ZIM d UNITED vSTATES PATENT OFFICE.

MARY HALL ELAI'sDELVL, oELEw1sToN-,MAINE- FLY-SCREEN FOR WINDOWS, DOORS', 84C.

SPECIFICATION forming part of Letters Patent No. 582,439, dated January 15, 1895. Application tiled April 23, 1894. Serial No. 508,590. (No model.)

`dows, Doors, &c.; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in window and door screens used for the exclusion of flies and ings, &c.

The object of the invention is to take advantage of the well-known desire of insects to crawl upward and to provide them with an exit from but not an entrance to said dwellings. t

To this end the invention consists in the formation of transverse openings the full width of the screen centrally in the body and at the top at the meeting-ends of an upper and lower section of said screen the said openings being formed by the peculiar formation of the angles in the meeting-ends of said secother insects from dwelltions so as to provide an exit for the insects as Well as to turn them back in their course upon the screen after being excluded and prevent their crawling back through the passages or openings again vinto the room.

In the accompanying drawings to which reference is made and which fully illustrate my invention Figure 1, is an outside elevation of my improved screen as appliedA to a window sash or frame, and Fig. 2, is a central vertical section.

Referring by letter to the accompanying drawings, A, designates the window or door frame and B, the netting or wire screen applied thereto with its body standing in a vertical plane. Said netting must be made of wire. At the center of the screenor the point.- where the upper and lower sections meet is a transverse opening C, extending throughout the width of the screen outl through which the insects make their exit.l Great advantagesare thus derived from the peculiar formation and arrangement of the angles inv the upper and lower sections of the screen by which this opening as well as another above it is formed for the exit of the [iies or other insects where the same are prevented/from effecting an entrance back again into the dwelling. Another opening D, similar tothe one just referred to is formed at the top of the screen for a similar purpose t. c. for the exit of the insects. The angles made in the upper and lower sections of the screen by which these openings are formed, will now be fully described.

Secured transversely to the top and under side of the window or door frame A, is a strip of netting or wire-gauze E, extending the wholewidth of the screen and inclined at an angle of about forty-tive degrees, and whichuis separate and disconnected from the upper e/nd of the upper section of the screen and constitutes one side of the opening D. The other or opposite side of the opening D is formed by the upper end of the upper section of the screen which very slightly curves at the point where it is bent over outwardly or toward the outer surface of the screen, and which describes an acute angle. The lower end of this upper section of the screen is slightly curved inwardly, as at e, and bent upon itself atf, forming an acute angle. The point where bent lies in an opposite direction to the apex of the angle of the upper end ofthe upper screen section and constitutes one, or the upper side of the inclined opening C. The upper or meeting end of the lower screen is also very slightly curved from the point where it is bent over and describes another acute angle the apex of which lies in the same direction or plane as that of theV apex of the upper end of the upper section of the screen and constitutes the other or opposite side of the opening C, providing an inclined opening and an indirect passage.

By such construction of screen as above described the insects within the dwelling which alight upon the inner side of the screen sections, as they crawl upward will nd a free exit through the openings C and D,`and will 4pass directly through the same from the and away from the openings as it is impossible for them to eect an entrance into the inside of the house and through the openings in consequence of the peculiar construction or formation of the angles forming the openings in the top and body of the screen sections for preventing the return of the insects through said openings.

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

A iy screen comprising three parts the upper section having its upper end bent upon itself leaving an inclined portion terminating in a Vertical depending flange the lower MARY HALL BLAISDELL.

Witnesses:

GEORGE W. CRooKE'rT, S. A. BLAISDELL.

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