US2361988A - Boomerang - Google Patents

Description

INOV- 1944- w. B; BONNIFLIELD 2,361,988

BOOMERANG Filed Aug. 3]., 1942 2 Sheets-Sheet 1 2& 3

. He 4. FIG. 5

INVENTOR W5 Haw/FIELD M Patented Nov. 7, 1944 momma west B. not-amen, Sioux City, its; 2 Application August 31, 1942, Serial N5. 456,831

3 Claims.

My present invention pertains to the field of toys and more particularly to the type of toy which is called boomerang.

Among the objects of this invention are to provide an improved folding toy of the nature indicated; to provide a boomerang which can be readily folded but in which the blades will normally hold their adjusted position; and such further objects, advantages, and capabilities as will hereafter appear and a are inherent in theconstruction disclosed herein.

In the drawings annexed hereto and forming a part hereof,

Fig. 1 represents a plan view of one form of embodiment of my invention;

Fig. 2 represents an edge view of the structure shown in Fig. 1;

Fig. 3 represents a plan view of one of the blades of the structure illustrated in Figs. 1 and 2;

Fig. 4 represents a right hand end view of the structure shown in Fig. 3; i

Fig. 5 represents a cross section approximately along the plane indicated by the line 5-5, Fig. 3;

Fig. 6 represents another form of embodiment of this invention;

Fig. 7 represents a plan view of the middle element shown in Fig. 6;

Fig. 8 represents a plan view of the bottom element in Fig. 6;

Fig. 9 represents a cross section substantially along the plane indicated by the line 9-9, Fig. 6, or along a corresponding section of either of the other blades;

Fig. 10 represents an outer end view of any one of the blades; and

Fig. 11 represents an end view of the middle blade, as viewed from the left end of Fig. 7.

Reference will now be made in greater detail to the annexed drawings for a more complete description of this invention. In 'the structure shown in Figs. 1 to 5, inclusive, the blades l are substantially identical, each having its forward edge 2 formed with a rounded bevel and its trailing edge 3 with a fiat bevel. The blades taper from their outer wider ends to their inner narrower ends. These narrower ends are provided with perforations 4 for the reception of a pivot member 5 which binds these ends together so that these blades will not be inadvertently moved with reference to each other but so that they can be manually adjusted to the desired angles, preferably one hundred twenty degrees (120) apart.

During flight, the beveled edges 2 and 3 are normally on the upper side of the boomerang, the rounded bevel 2 being at the forward edge and clusive, the blades la, lb, Ic have their forward and trailing edges beveled, but, in this instance,

these bevels are all substantially flat, the direction of bevel being somewhat modified by slightly warping each blade approximately along its longitudinal axial line, as represented in Fig. 9. The corner beveling in this form is accomplished by warping the blades approximately along the dotted lines I.

The blade la is provided with a substantially radial finger 8, the blade lc with a similar finger 9, and the blade lb with notches l0 and H. The points l2 and I3 upon opposite sides of the notch [0 are bent downwardly to cooperate with the finger 9 in holding the blades la and lb in adjusted position, when spread out, and the points l4 and 15 are bent upwardly to cooperate with the finger 8 of blade la, similarly. The warping of the blade lb, at its notched end, is shown most clearly in Fig. 11. Of course the pivot member 5, in this form of construction, may be tight enough normally to hold the blades sufficiently so that they will not revolve about the pivot memberbut the fingers 8 and 9, cooperating with the points l2, l3, I4 and I5 will make assurance doubly sure and make it certain that there will be no inadvertent revolution of the blades about the pivot 5.

To use a boomerang constructed in accordance with my invention, it is spread out as shown with the arms arranged at substantially equal angles with relation to each other. Then, a blade is grasped between a thumb and finger andthrown overhand with a quick snap of the wrist to give it a rapid spin or rotation.

Having now described my invention, I claim:

1. A boomerang comprising three blades tapering in width from one end toward the other, said blades being perforated adjacent their narrower ends and having a pivot member extending through the perforations and holding the blades together moderately tightly but loosely enough to permit them to be turned about the pivot to be substantially evenly spaced, angularly, said blades being substantially flat upon one face but having a diagonal bevel at one of the corners remote from the pivot, the secondface being mostly flat but having its two longitudinal edges beveled, one

of them having a flat bevel and the other a rounded bevel.

2. A boomerang comprising three pivotally connected blades, each tapering from a wider outer end toward a narrower inner end, a pivot member extending through the narrow ends of the blades and holding them moderately tightly to prevent inadvertent turning about the pivot member but loosely enough so they can be turned when desired, both edges of each blade being beveled upon the face which is normally uppermost when in use, and the corner at the end of each blade which is at the forward edge of the blade as the boomerang rotates in flight being inclined upwardly on its bottom surface with relation to the mid-plane of the blade.

3. A boomerang comprising three pivotally connected blades, said blades tapering from a wider outer end toward a narrower inner end and each having a perforation in its narrower end for the reception of a pivot member, a pivot member extending through the perforations and holding the blades tightly together but with the capacity of being rotated about the pivot by the application of force, one of the blades having its inner end provided with notches in its edge, the points at the sides of one notch being bent transversely of the thickness of the blade,

. in one direction, and the points at the sides of the other notch being bent in the opposite direction, the other two blades each being provided with a diagonally extending finger to cooperate with one of the notches in the notched blade.

WEST B. BONNIFIELD.

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