US1573294A - Reenforced bracing member for aircraft - Google Patents

Description

5. C. BOULTON REENFORCED BRACING MEMBER FOR AIRCRAFT Feb. 1 1926.

Filed June 27. 1923 INVENTOR 5. 655 0a Z Z (n ATT NEY QQQQ QVQDQ Patented Feb. 16, 1926.

, UNITED STATES! BEBTHOUD C. BOUL'I'OI T, OIL DAYTON, OHIO.

PATENT OFFICE.

BEENFORC ED BBACING MEMBER'EQR AIRCRAFT.

Application filed June 27, 1923. Serial No.;648,053.

and State of Ohio, have invented certain new and useful Improvements in Reenforced Bracing Members for Aircraft, of which the following is a'specification.

This invention relates to reenforced plywood construction as applied to an aircraft brace or stress member and more particularly to a rib member for airplanewings which is constructed in this manner. I

The prime object of my invention is to provide a reenforced .sheet of plywood to define the contour of the wing which is reenforced by strips of wood attached thereto without the necessity of employmgany fitt'ngsor socket members.

Further objects will be more fully set forth in the attached specification and claims and in the drawings, in which;

Fig. 1 is an elevation of a rib member,

Fig. 2 is an enlarged view of a portion of my improved rib member.

Fig. 3 is a section on the line 33 of Fig. 2, and

Fig. 4 is a section on the line 4-4 of Fig. 2.

Referring more particularly to the drawings by reference numerals, a rib designated generally by the numeral 10 is constructed of a sheet of plywood 11', which extends vcontinuously from the upper to the lower extreme portions of the finished, .rib and forms the main backbone of the structure. A strip of wood'12, is attached to the side of the sheet of plywood-and extends con tinuously around the edge of this sheet of plywood, the outer portions of 'both sheets being flush so that both the strip 12 and the sheet 11 define the cross-sectional contour oi the Wing. A second strip 13 is" provided on the opposite side of the sheet 11. I

Diagonally extending between the upper and lower portions of the strip 12 are a plurality of diagonally extendin enforcing truss members 14, each of which consists of a strip of wood 15 and a second strip 16 which together define a pair of reenforcing members one on each side, and attached to the strip 11 and extending between the parts of strips 12 and strips 13 so as to rigidify the entire structure by reenforcin the sheet 11 and by bracing strips 12 an 13. The portions of the sheet 11 which are between strips 12 and 14 are cut away so as to form holes 17 so as to remove surplus material to make the structure lighter.

The different strips which reenforce the .sheet 11 may be attached to this sheet 11 b glue or by small nails such as 18, or by hot of these means. It will therefore be understood that I have provided a rib member which is exceedingly light and yet exceptionally strong and is at the same time very easily constructed, as no special fittings or socket members are required to join the reenforcing members together.

I claim:

A structural rib for airplane wings comprising a sheet of plywood defining the sectional contour of the airplane wing, strips of wood of small cross-sectional' area attached to the upper and lower edges at the sides of said sheet and flush with the outline of said sheet to also define the sectional contour of the airplane wing, a plurality of reenforcing strips of wood extending "diagonally between said upper and lower edges and attached in pairs directly to said plywood sheet, on opposite sides thereof, said plywood sheet being cut away between said diagonally extending strips whereby a rigid truss is provided without the use of fitting members.

In testimony whereof I aflix my signature.

BERTHOUD QFUULTON.

Images