US3749623A - Method of making archery arrow - Google Patents

Abstract

Plastic archery arrow fletching which is flexible to ordinary mechanical and aerodynamic forces and sufficiently resilient so that after flexing it returns rapidly to its diffusion source. Prior to the performance of the diffusion step, a thermally grown oxide layer is provided on the second islands.

Description

July 31, 1973 orr 3,749,623

METHOD OF MAKING ARCHERY ARROW original Filed April 28, 1968 2 Sheets-Sheet 1 HQ\ 200 22 200 I0 9 Q I9 FIG 2 FIG 6 FIG 7 l8 If I?) p l4 Ila How I9 22 llb llb 24 23 FIG 4 FIG 5 July 31, 1973 A. E. BENOIT 3,749,623

I METHOD OF MAKING ARCHERY ARROW Original Filed April 28, 1968 2 Sheets-Sheet 2 FIG 9 FIG :0

ELECTRIC POWER SOURCE United States Patent 3,749,623 METHOD OF MAKHNG ARCHERY ARROW Alfred E. Benoit, 221 Whitney St., Northboro, Mass. 01532 Continuation of application Ser. No. 724,430, Apr. 26,

1968, now Patent No. 3,595,579. This application Apr.

5, 1971, Ser. No. 131,377

Int. Cl. B6511 81/00 US. Cl. 156-187 3 Claims ABSTRACT OF THE DISCLOSURE Plastic archery arrow fletching which is flexible to ordinary mechanical and aerodynamic forces and sufiicient- 1y resilient so that after flexing it returns rapidly to its original shape is made by cutting two sections from a sheet of plastic, folding each section along corresponding edges to define a vane portion and a flap portion on each and attaching the vane portions back to back to form a single vane with flaps extending in opposite directions from one edge thereof, whereby the vane is attachable t0 the shaft of an arrow by the flap portions.

This application is a continuation of application Ser.

. No. 724,430, filed Apr. 26, 1968.

This invention relates to methods and means for making archery arrows, and particularly to the fletching of archery arrows.

Heretofore, fletching for archery arrows has been made of feathers and a number of materials which have been substituted for feathers. For example, it has been suggested that the arrow fletchin g or vanes be made of plastic materials, which are molded into the shape of the vane and then attached to the arrow shaft. Some of the plastic materials that have been suggested include celluloid, polyethylene, vinyl chloride, vinyl acetate. It has been the practice to cut or mold the vane from such plastic material and to mount the vane to prepared slots or devices on the arrow shaft.

One purpose of using the plastic feather substitute is to provide a vane which is mechanically tougher than the feather and is not affected by environmental conditions such as moisture temperature, etc., as is the feather. The feather substitutes used in the past are superior to the feather in these respects, however, they are not sufliciently flexible or resilient and in some cases must be located on the shaft so that they will not strike the plate or ledge on the archers bow, when the arrow is launched. If the rigid vane strikes the plate or ledge on the how when the arrow is launched, the arrow is deflected excessively and the flight of the arrow is not true.

Accordingly, it is one object of the present invention to provide archery arrow fletching which has all the advantages of plastic fletching employed heretofore and in addition is sufiiciently flexible so that the vanes bend substantially from aerodynamic and mechanical forces which normally occur when the arrow is launched into flight and which is sufliciently resilient so that after bending, the vanes return to their original shape rapidly.

It is another object of the present invention to provide method and means for fletching archery arrows that does not require slots in the arrow shaft or other devices attached to the arrow shaft to which the fletching vanes are attached.

It is another object of the present invention to provide simple and inexpensive arrow fletching which is mechanically tougher and more moisture resistant than feathers.

It is another object of the present invention to provide methods and means for fletching arrows, with personalized designs on the fletching.

It is another object to provide methods and means for fletching arrows by an archer in the field.

Other features and objects of the present invention will be apparent from the following specific description taken in conjunction with the figures in which:

FIG. 1 is a planned view of a sheet of plastic material from which the fletching vanes are formed;

FIG. 2 shows a section of the plastic material revealing the adhesive and paper backing;

FIG. 3 shows a section cut from the sheet of plastic material for forming an archery arrow vane;

FIGS. 4 and 5 illustrate steps in folding the section to form a vane;

FIGS. 6 and 7 illustrate alternate steps in folding the section to form a vane; 7

FIG. 8 illustrates how a vane is attached to the shaft;

FIG. 9 illustrates an end view of the shaft, showing three such vanes attached;

FIG. 10 illustrates a side view of the shaft, showing three such vanes attached;

FIG. 11 illustrates one method of shaping the vane;

FIG. 12 illustrates the completed fletching; and

FIG. 13 illustrates an alternate method whereby the vane is shaped before attaching to the shaft.

In accordance with the present invention, the arrow fletching or vanes are made of a flexible plastic material of selected type and thickness such that the vanes will flex substantially due to aerodynamic forces experienced by an archery arrow in flight. Thus the vanes will deform readily when subject to mechanical forces such as occur when the vanes strike the ledge or arrow plate on the archers bow, and so the arrow will not be deflected substantially from its proper course when this occurs. Another important quality of the material is that it is quite resilient, so the vane returns to its original shape immediately after deflecting due to the aerodynamic forces normally experienced in the flight of such an arrow. This return to shape is so rapid that the bent vanes do not alter tthe flight of the arrow to any observable extent and in fact that arrow flies flatter than an arrow fletched with feathers. In addition, the vane is designed so it can be attached or fletched to the arrow shaft and does not require an accommodating slot or fixture on the arrow shaft by which to attach the vane to the shaft.

FIG. 12 illustrates one end of an archery arrow shaft 1 to which are attached the fletching 2 consisting of three plastic vanes 3, 4, and 5, symmetrically arranges on the shaft and the nock 6 at the end of the shaft, which is engaged by the bow string when the arrow is launched.

The fletching vanes 3, 4 and 5 in FIG. 12 are each attached to the shaft 1 by a pair of flaps on each vane, such as flap 7 on vane 3. One suitable way of fastening the flaps to the shaft is to bond them with an adhesive or a cement. The flaps are preferably extensions of the vane and are bonded to the shaft 1 so that the flaps on each vane are symmetrical relative to the plane of the vane. This insures not only proper fastening but the support of the vane by the flaps and fixes the normal vane position with the plane of the vane substantially defined by radial lines from the shaft.

The plastic material from which the vanes are made is preferably sufficiently flexible so that the vanes will bend easily when subject to the normal aerodynamic and mechanical forces which occur when the arrow is launched. Thus, when the vanes encounter the bow they will not deflect the arrow. In addition, the vanes must be resilient so that after deflection they rapidly return to their normal position to provide proper aerodynamic guidance of the arrow in flight. This is insured if the plastic material is a polyester film such as Scotchcal and the total thickness of a vane is on the order of .004 to .020 inch.

Scotchcal is a product of Minnesota Mining and Manufacturing Company identified more generally as a photosensitive polyester film, which is a thermo-setting resin that is tough, flexible, and resilient and moisture proof. Thus, Scotchcal quite readily meets the objectives of the present invention and provides archery arrow fietching having substantial advantages over other plastic iletching used in the past and over the turkey feather fietching that is so well known. For examples, the tensile modulus of Scotchcal, which is a measure of its resilience is to times greater than that of a thermo-plastic resin and the tear (initiation) strength of Scotchcal which is indicative of its flexibility, is approximately 2000 lbs/in.

A few other plastic materials having tensile modulus and tear initiation strength comparable with Scotchcal, could be used and provide some of the advantages of Scotchcal to arrow fletching. Thermo-plastic resins in this category include polyestyrene, polymers, copolymers and polypropylene, and thermosetting resins in this category include Duponts Mylar, melamide, and silicone cast resins.

None of the plastic materials used in the past for arrow fietching have been entirely satisfactory because when vanes of suflicient strength have been made from these materials, the vanes would not be sufiiciently resilient. Thus, it has been necessary in the past to place the plastic fietching vanes on the shaft at positions so designed that they would not trike the how when the arrow is launched and these positions are invariably less desirable from an aerodynamic standpoint.

Another advantage of a polyester film is that it can be made in thin sheets which are photosensitive, and so individual and personalized designs can be made on a sheet of polyester film, from which the fietching is formed, so that these designs decorate and identify an individuals arrows.

Turning next to the FIGS. 1 through 13, there is shown a number of views depicting the steps in fletching an arrow, to provide the fietching 2 consisting of the vanes 3, 4- and 5, shown in FIG. 12.

The process or method of fletching the arrow shaft 1 can begin with a sheet 10 of, for example, Scotchcal, such as shown in FIG. 1. The photo-sensitive side 11 of the sheet is first exposed to images and then developed to provide the series of designs and lines such as shown; in FIG. 1. The dotted lines, such as 12 and 13, define a series of equal size rectangles on the sheet, each of which is a section from which a single vane is made. The dot-dash lines 14 define the center line of each section and the dash lines, such as 15 and 16*, define folding lines, the purpose of which will be discussed below.

In each of the sections of the sheet 10, such as section 17, designs are produced on each side of the center line 14. These designs such as the serpentine arrow 18 may be decorative and/or personalized to indicate the owner of the arrow or the club to which the owner belongs, etc;

The sheet 10 is preferably adhesive backed, with an adhesive such as 19 on one side, covered with protective backing paper 20 which does not bond to the adhesive and peels off readily.

After forming the lines and images on the sheet 10, the sections such as section 17 are cut out and a single section, such as section 17, shown again in FIG. 3, is treated as follows: The backing paper 20 is peeled off the section 17 and the section is folded along the center line with a piece of backing paper 21 or material which will not stick to the adhesive 19 inserted into the fold as shown in FIG. 4. The section is then folded along lines 15 and 16 to define the flaps 22 and 23 and then the backing paper 22 is removed. The fold is then completed and the adhesive 19 on the inside of the fold contacts, so that the two sides 11a and 11b contact, bonding them together to form the vane blank 24 with the two flaps 22 and 23 projecting along one edge. The unshaped 4 vane blank is then ready for shaping and/or attaching to the arrow shaft.

If the vane blanks are stored for future use it may be preferred to leave backing paper on the flaps. This is accomplished as illustrated in FIGS. 6 and 7. In this case backing paper 20 only is cut along the dash lines 15 and 16 and then the center strip of the backing paper is peeled oif the section, leaving the end strips of backing paper 20a and 2% still on the section. The section 17 is folded along the center line 14 with the piece of backing paper or material inserted into the fold as shown in FIG. 6. Once the crease has been made along the line 14, the piece 21 is removed, the fold is completed as shown in FIG. 7, bonding the two sides 11a and 11b together to form the vane blank 24. Folds are then made along the lines 15 and 16 to define the flaps 22 and 23, the adhesive sides of which are still covered with backing paper strips 20a and 2% respectively. The unshaped vane blank can then be stored without danger of spoiling the adhesive on the flaps until it is ready for attaching to the arrow shaft.

As shown in FIG. 8, the unshaped vane may be cut at one end so that the flaps 22 and 23 extend beyond the front end of the vane blank 24. The use of these extensions 22a and 23a of the flaps 22 and 23, respectively, will be explained below. After the backing strips 20a and 20b are stripped off the flaps, the vane blank is then fletched to the arrow shaft 1.

Fletching of the vanes to the shaft is preferably accomplished with a tool made for this purpose by which the vanes are aligned to define a helix along the shaft, so that in flight they cause the arrow to spin on its longitudinal axis. In accordance with this method, the vanes are attached one after another or even simultaneously if possible, to the shaft 1 before the vanes are shaped or further processed. In FIG. 8, the broken lines 26 outline the projection of the flaps on the shaft 1, to show the position of the flaps when attached by the adhesive to the, shaft defining a helix along the shaft. This produces a spin in flight.

FIG. 9 shows three such uncut vanes attached to the shaft 1 as viewed down the axis of the shaft. Quite clearly, the width of the flaps 22 and 23 are such that they subtend a total angle from the axis of the shaft of no more than thus, when three such vanes are attached to the shaft, the flaps abut and need not overlap if properly cut and fastened to the shaft. This arrangement also insures that once the first vane is fletched. to the shaft with the proper twist the other two uncut vanes 27 and 28 when attached with their flaps properly abutting the flaps of vane 24, will define identical helices. This allows iletching arrows in the field with relative ease and without fletching tools.

After the unshaped vanes are attached to the shaft,-

the vanes are shaped. For this purpose, a device sometimes called a feather burner, such as shown in FIG. 11 may be used. The feather burner consists generally of a resistance ribbon 31 made of Nichrorne wire formed in the shape desired for the fletching vanes. The ribbon is supported by electrical leads 32 and 33 which connect to electric power source 34, which energizes the ribbonv 31, heating the ribbon so that it will burn through the plastic material the fietching vanes are made of.

The cutting ribbon 31 is positioned relative to a frame 35 holding the arrow so that when the arrow is inserted into the frame and rotated, the fietching vanes, one after another are burned to produce the desired fletching vane shape. Thus, the unshaped vanes 23, 2.7 and 28 are formed into shaped vanes 3, 4 and 5 in FIG. 12. After fletching the vanes and shaping as described above, or in any other fashion, the ends such as 22a and 23a of the flaps on each vane (shown in FIG. "8) are covered by wrapping a' strip of tape 36, which may be of Scotchcal or any other suitable material, around these ends. The tape prevents the ends of the'flaps from being lifted during use and generally protects the front end of the fietching which is normally subject to considerable wear and tear when the arrow is used. It is the front end of the fletching which is most inclined to be lifted when the arrow is used and the tape 36 Wrapped around the ends of the flaps prevents this.

The various steps described above for making what has been found to be a very useful arrow fietching may be varied somewhat and yet still produce the same desirable structure. For example, the design lines and the fold and cut lines on the sheet of polyester film may be imprinted by other techniques than the one described herein, or they may be omitted. The technique described herein which makes use of photosensitive polyester film is advantageous but not required in all applications.

As an alternate step, the unshaped vane 24 such as shown in FIG. may be cut or formed into the desired shape before it is attached to the shaft 1. For this purpose, cut lines such as 37 may be produced on the sheet shown in FIG. 1 as a guide line for cutting out each of the vanes before it is attached to the shaft. The vanes may be out along lines such as 37 at the same time the ends of the vanes are cut (as in FIG. 8) to produce the extensions 22a and 23a of the flaps. This is illustrated in FIG. 13. As shown in FIG. 13, the uncut vane is cut along the lines 37 and 39 which are produced on the photosensitive side of the sheet of Scotchcal when it is first exposed. The vane is most easily cut along these lines before it is attached to the shaft 1 and eliminates the necessity of using a feather burner to shape the vanes.

It is to be understood that while only a few embodiments of methods and means of practice of the present invention are shown herein, these embodiments are made by way of example only. Other arrangements and modifications may occur to those skilled in the art and may be used without departing from the spirit and scope of the invention.

What is claimed is:

1. A method for making plastic arrow fletching comprising the steps of,

cutting two identical sections from a sheet of plastic material, each section having a vane portion and a flap portion, with an adhesive on one side of said portions covered with a non-adhering backing material,

folding each section along a line along an edge thereof which defines the juncture of the vane and flap portions,

removing the backing material from the vane portions only of the two sections,

attaching the two sections together at the vane portions forming a single vane of double thickness with two flap portions extending in opposite directions therefrom along one edge thereof, and each flap portion having adhesive on one side thereof covered with non-adhering backing material,

whereby said double thickness vane is attachable to an arrow shaft at the flap portions with the flap portions laying flat on the shaft and the vane extending substantially radially therefrom by removing the backing material from the flap portions and then so attaching to the arrow shaft.

2. A method as in claim 1 wherein,

the sheet of plastic is photosensitive on one side, and

before cutting the sections from the sheet, the photosensitive side is exposed to patterns and developed producing said patterns thereon which appear on both sides of the vane attached to the shaft.

3. A method as in claim 1 wherein,

the flap portion of each section extends beyond the vane portion, and

after attaching the vane to the shaft at the flap portions,

wrapping material about the shaft binding the flap extensions to the shaft.

References Cited UNITED STATES PATENTS 2,711,382 6/ 1955 'Smith-Johannsen 156-227 DOUGLAS J. DRUMMON D, Primary Examiner US. Cl. X.R. 156-227, 277, 289, 292

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