US1744697A - Machine for forming arrow shafts - Google Patents

Description

Jan. 21, 1930. P. H. GRANGER MACHINE FOR FORMING ARROW SHAFTS Filed Nov. 22, 1927 2 Sheets-Sheet 1 A TTORNEYS Jan. 21, 1930. P. H. GRANGER MACHINE FOR FORMING ARROW SHAFTS Filed Nov. 22, 192'] 2 Sheets-Sheet 2 Patented Jan. 21, 193 3 UNITED STATES PAUL I-I. GRANGER, OF LOS ANGELES, CALIFORNIA MACHINE FOR FORMING ARROW SHAFTS Application filed November 22, 1927.

This invention relates to a machine for forming shafts or elongated round bodies and the main object of the invention is to provide a machine which will rapidly and accurately 6 cut.shafts of any desired shapes from suit able stock.

A further object of the invention is to provide a machine for this purpose which will enable the shape of the arrow out therefrom to be varied at will.

The accompanying drawings illustrate embodiments of my invention and referring thereto:

Fig. 1 is a plan view of the machine.

Fig. 2 is a side elevation thereof.

Fig. 3 is an end elevation taken from the right hand end of Fig. 2.

Fig. 4: is a horizontal section of the ar row stock separating means showing the portion of the cutter in operative position.

Fig. 5 is a section on line 55 in Fig. 4.

Fig. 6 is a section on line 66 in Fig. 4.

Fig. 7 is a diagrammatic section of the stock showing the relation of the cutter thereto.

Fig. 8 is a partial section of the feed nut used to feed the stock forward.

Figs. 9 to 12 inclusive show different forms of arrow shafts which may be cut by my ma- 0 chine.

The operative parts of the machine are mounted on a suitable base 1 which is adapted to be secured to any suitable support and is provided with bearings 2 in which is mounted a shaft 3 for a cutter head 4, said shaft being also provided with suitable driving means such as pulley 5 adapted to be driven by any suitable driving connection.

A work carrier 7 is mounted to slide on guide way 8 on the base 1 and is provided with means for supporting, rotating and feeding the stock or wooden strip out of which the arrows are to be formed. A bearing 10 is rigidly mounted on the carrier 7 and a hollow shaft 11 is mounted to rotate within said bearing and is provided with suitable driving means such as pulley 12. Adjacent the inner end of the bearing 10 and between said bearing and the cutter 4 is provided a collar 15 supporting a feed nut 16 which is Serial No. 235,040.

adapted to surround the arrow stock and to engage the same to feed the stock forward toward the cutter in the rotary movement of the stock. Said feed nut has a forwardly tapering base and thread therein, to permit the stock to enter same. For convenience in construction the collar 15 may be made in upper and lower halves connected to one another and to the base 1 by cap-screws 18 and may be formed with square recesses 19 forming, when the parts of the collar are assembled, a square opening adapted to fit and hold in position the feed nut 16, the outside of which is rectangular in shape, as indicated, to fit said opening. Feed nut 16 is preferably formed with ratchet threads, as shown in Fig. 8, so as to present fiat faces at the front thereof, to provide for more effective feeding action. A collar 20 may be provided between the feed nut 16 and the inner end of the hollow shaft 11 and adjacent its inner end said hollow shaft is provided with a square opening or passage 21 adapted to fit more or less closely the stock of which the arrows are to be formed. For convenience in adapting the machine to stock of diiferent sizes, said square opening is preferably formed in a sleeve or liner 22 of rectangular cross-section secured by Babbitt metal or otherwise within an axial bore 23 in the shaft 11 so that such liner may be re moved and be replaced by another of clifferent size if required. At its outer end the hollow shaft 11 is provided with a guide flange 24 which is boredas at 25 to fit the arrow stock as shown in Fig. 3 and said flange may also be adapted to be removed and replaced to fit the particularstock which it is desired to use. Atits inner end the hollow shaft 11 may be provided with a screw thread 27 adapted to prevent grease working out of the bearing at that end.

Adjacent to the feed nut supporting collar 15 is provided a back rest or work support 28 rigidly secured on the work carrier 7, for example, by cap screw 29. For convenience in aligning the various parts the bearing 10, collar 15, and work support 28 are preferably provided with key ways adapted to fit on a single key 30 extending on carrier 7 parallel '2 to the direction of arrow feed and transverse to the direction of movement of the work carrier. Said work support 28 is provided with a tapering recess 31 concaved as shown in Fig. 5 to approximately fit the arrow stock as it is being cut to shape and prevent undue springing of the stock under the pressure of the cutter. Said recess may be provided with a removable liner 32, so as to adapt it to different size arrows. Actual and accurate centralization of the stock, however, during the cutting operation is provided by the driving sleeve 22 and feed nut 16 at one side of the cutter and by a self-adjusting steady rest supported on the back rest 28 at the other side of the cutter. Said steady rest is mounted within a recess 33 formed in the part 28 and having a conical or tapering face 34 against which seats a conical face 35 on a steady rest collar 36. Said steady-rest collar is held in position by means of a cap 37 secured by screws 38 to thepart 28 and formed with a cylindrical portion 39 fitting over a cylindrical portion 40 of a follower plate 44 and containing a spring 41 engaging at one end with shoulder 42 on saidcap. and at the other end with the hub portion 40 of the follower plate 44 which is adapted to slide within a cylindrical recess 45 in the steady rest collar. Said steady rest further comprises sliding jaws 46 which have convex inner faces 47 adapted to fit more or less closely the finished arrow shaft, said jaws being mounted to slide in a direction parallel to the axis of the arrow shaft by engagement of said jaws in ways 48 formedin-the steady rest collar 36 (see 6), said ways being convergent toward the cutter 4 and the respective aws being provided with inclined faces 48 engaging said ways so as to cause the jaws to move inwardly toward the axis of feed of the arrow stock they are moved longitudinally parallel to the said axis by the operation of spring 41. By the described construction the jaws 46 are enabled togrip'and hold the arrow shaft at the delivery side of the cutter so as to maintain accurate centralization of the arrow shaft during the cutting operation, while-at the same time said aws will yield automatically to accommodate variationin size of the arrow shaft as-it enters said jaws by reason of variation in diameter of the arrow shaft from end to end as hereinafter described.

The work carrier 7 is operated by any suitable means, for example by handle 49 on a shaft 51 mounted to turn in a bearing 50 on base 1 and provided with a screw portion working in a lug 52 on the work carrier 7 to move the work carrier toward or from the cutter.

The machine is intended to operate upon stock consisting of wooden stripsof suitable cross-section, for example, square strips or stock sections, indicated at 53, of sufliciently large cross-section and suificient length to enable the desired arrow shaft to be out therefrom, and for convenience in feeding the stock into the machine and delivering the shafts therefrom, each stock section corresponding to a single arrow is preferably formed at each end with means for engaging or connecting it with a preceding or succeeding section, for example, by a wooden key, as indicated at 54 in Fig. 4. In the operation of the machine a series or succession of stock sections are fed into the openin 25 and through the squared opening 21 and the feed nut 16 and the hollow shaft 11 being set in rapid rotation by the driving means 12, the squared stock, which is in rotative connection with the hollow shaft by engagement with the squared opening 21, is caused to turn within the feed nut 16 and said feed nut engages the corners or edges of the stock so as cut a screw thread on such edges, the portions so out being indicated in dotted lines in Fig. 7 and also to cause the stock to operate as a screw within the fixed feed nut 16 by reason of the helical cuts so formed in the stock section so that the stock is forced to feed forward in the direction of the arrow in Fig. 4 in such manner that its forward end passes in front of'the cutter 4. In passing in front of the cutter which is set in rotation by driving means 5, the stock is cut by a taper cut (the operation of the cutter on the stock being indicated in Fig. 7 so as to reduce its forward end to round cross-section sufiiciently small to enter and turn within the steady rest jaws 46, the advancing stock, in the case of the first stock section so entered, pushing the jaws back until the aperture between the same is enlarged sufliciently to enable the stock to enter. In the case of succeeding stock sections, each section followsthe preceding one immediately and the key connection 54 causes rotation of the preceding section by the succeeding section even after the preceding section has passed out of "the squared opening 21. Thus a continuous series of stock sections is fed through the machine by the rotation of the stock and the operation of the fixed feed screw 16. As each stock section passes in front of the cutter the operator by means of the handle 49 operates the work carrier 7 toward or from the cutter so as to increase or decrease the depth of cut and correspondingly decrease or increase the diameter of that particular part of the arrow shaft. By this means it is possible for the operator to cut arrow shafts which are straight or of uniform cross-section, as indicated in Fig. 9, or tapered toward the head, as indicated at 53 in Fig. 10 or toward the tail, as indicated at 58 in Fig. 11, or socalled barrel shaped, as indicated at 53 in Fig. 12. Notwithstanding this variation in cross-section of the arrow shaft as it passes from the cutter, the steady rest above described will at all times maintain a firm centering grip upon the shaft, the jaws 46 yielding resiliently as a larger part of the shaft enters between them, and closing toward the center as a smaller part of the shaft enters between them, the spring 41 always maintaining a definite centralizing pressure on the arrow shaft irrespective of its variation in size.

While I have described my invention as applied to production of arrow shafts, it is also applicable to the production of any shafts or bodies of relatively great elongation and small diameter, requiring support close to the cutting tool.

I claim:

In a shaft forming machine, a work carrier provided with means for receiving, holding and rotating a shaft stock, means for engaging with the shaft stock to feed the same forward in its rotation, a rotary cutter, means for effecting relative motion of the work carrier and rotary cutter, and means adjacent the rotary cutter for supporting the work after it is cut and comprising a stationary support provided with inclined ways converging toward the cutter, jaws movably mounted in said ways and adapted to surround and guide the work, and spring operated means engaging said aws to move them toward the cutter so as to yieldingly support and guide the work while permitting forward movement thereof.

In testimony whereof I have hereunto subscribed my name this 10th day of November,

PAUL H. GRANGER.

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