US1149605A - Manufacture of pawl-frames, &c. - Google Patents

Description

C. H. V R.

MANUFACTURE OF P FRAMES, 8w.

APPLICATION FILED APR.22, 1915.

1,149,605. Patented Aug. 10, 1915.

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COLUMBIA PLANOGRAPN CO..\VI\SHINGTON. 0. c.

c. H. VEEDER.

MANUFACTURE OF PAWL FRAMES, &c. APPLICATION FILED APn.22, I915.

1,149,605. Patented Aug. 10,1915.

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mm 111% "n TE STATES PATENT GFFQ.

CURTIS HUSSEY VEEDEB, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE VEEDER MANUFACTURING COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

MANUFACTURE OF PAWL-FBAMES, &o.

Application filed April 22, 1915.

To all whom it may concern Be it known that I, CURTIS HUssEY Vnnnnn, a citizen of the United States, residing in Hartford, Hartford county, State of Connecticut, have invented certain new and useful Improvements in the Manufacture of Pawl-Frames, &c., of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof.

In certain kinds of registers, numbering machines and the like, in which there is, for each machine, a succession of number wheels, of which each wheel of a higher denomination advances one step as the wheel of the next lower denomination completes a rotation, the number wheels are actuated in succession by the movement of a single, swinging pawl yoke or frame on which the pawls are differently disposed so that when the deeper notch of the ratchet wheel of an index or number wheel of lower denomination comes into position for engagement with the corresponding pawl, the relatively greater depth of that notch permits the next pawl in order to engage the ratchet wheel of the next index or number wheel. The pawls of such a pawl yoke or frame are set back, one from another, in a spiral series. Heretofore such pawl yokes or frames have been formed usually by milling and shaping with cutters and suitable tools and bar of metal. The operation of forming them has therefore been difficult and expensive, great accuracy being required.

The present invention has: for its object to reduce the cost of making such pawl frames and in accordance therewith, the pawls are first formed, by shaping and milling a straight bar of metal, in a straight series, the several pawls being connected at their bases, of course, by a common bar; then such common bar, uniting the pawls at their bases, is twisted slightly on its own axis so that the pawls assume the necessary spiral relation.

The invention will be more fully explained hereinafter with reference to the accompanying drawings in which are illus trated the successive steps in the formation of the pawl frame and suitable apparatus to be employed. in making the frame.

In the drawingsFigure 1 is a View in perspective of the stock or rod from which the pawl frames are to be made. Figs. 2

Specification of Letters Iatent.

Patented Aug. 10, 1915.

Serial No. 23,035.

and 3 are views in front elevation and end elevation respectively of the pawl frame in the first stage of its formation, when the pawls have been formed by milling. Figs. t and 5 are similar'views of the pawl yoke or frame in a later stage, after the bar has been twisted to make the pawls assume the desired relation. Fig. 6 is an edge view of the partly completed pawl frame as seen from above in Fig. 4:. Fig. 7 is a view of the completed pawl frame, with its trunnions formed. Figs. 8 and '9 are detail views illustrating sufficiently the devices em ployed for milling the teeth. Figs. 10, 11, 12 and'13 are respectively a top view, partly broken away, a side elevation, an end elevation and a cross section on the plane indicated by the line 13-13of Fig. 10, of devices for effecting the twisting of the frame.

The stock or rod (1, shown in Fig. 1, as it comes from the mill or draw bench has, in cross section, the shape of a pawl tooth with its base. Such stock, mounted in a suitable holder Z), is then subjected to the action of a group or groups 0 of milling cutters by which the rod is cut into suitable lengths and at the same time the pawls a a a a* a, more or less in number, are formed, the pawls or teeth remaining united attheir bases by a common bar at all as shown in Figs. 2 and 3. Then the connecting bar a is twisted on its own axis, so that the pawls or teeth assume the desired spiral relation, as shown in Figs. 4, 5 and (3. Either before or after the twisting of the bar a", as may be most convenient, the trunnions or pivots a may be formed at the yoke is of course eifected at the proper time.

It is conceivable that the twisting of the bar a might be accomplished by grasping the opposite ends of the bar with suitable pliers and then twisting. It is preferable, however, that this operation be formed with the aid of mechanical appliances which will insure accuracy and will also permit the work to be done rapidly. Suitable mechanical appliances are illustrated in Figs. 10, 11, 12 and 13. As there shown they comprise a suitable bed-plate d, on which is mounted, in suitable bearings, a shaft 0 which is provided at one end with a crank 6. Suitable stops cl are secured to the bed-plate d to limit the movement of the crank and therefore the extent of rotation of the crank e ends of the bar a. The tempering of the I and the shaft 6. At its other end the shaft 6 is provided with a suitable clamp 6 by means of which one end of the bar a may be grasped and held firmly in axial alinement with the shaft. On the bed-plate is also mounted a clamp 7 adapted to grasp and hold firmly the other end of the shaft a9. There is also secured on the bed-plate d a stepped or graduated stop 9, each step of which is so placed as to limit the movement of the corresponding pawl or tooth as the bar a. is twisted, so that the desired spiral relation of the pawls or teeth shall be es tablished with accuracy. It is obvious that if the bar is of uniform strength through out its length, or if it should be weaker near the end which is held by the clamp 6 the twisting of the bar might take place at one point or might take place in greater degree at one point than at another, so that the true spiral relation of the pawls would not be established. To insure such true spiral relation it is therefore necessary to effect the twisting of the bar progressively from the end where the twisting is least, as at the left hand end in Fig. 10, to the end where the twisting is greatest, as at the right hand end in Fig. 10, that is, that the proper amount of twisting of the bar between successive teeth or pawls, necessary to move each successive pawl farther than the preceding pawl, shall be accomplished. To effect this very desirable result there is provided a boosting device which insures the movement of the pawls or teeth in their proper order and therefore the twisting of the bar a. progressively. Such boosting device, as shown particularly in Figs. 10 and 13, comprises a series of plungers h mounted in a suitable block it, bearing respectively against the pawls or teeth a a etc., and pressed forward by stiff spiral springs 72, the strength of the springs being graded or reduced from left to right. The pawl a is therefore boosted by the strongest spring so that when the rotary movement of the shaft 6 begins the pawl a will be moved first and the twisting of the bar a will be gin between the pawl 01." and the pawl a When the pawl a reaches its stop, then the pawl (13, being boosted by the next spring, will continue its movement until it reaches the corresponding stop, with a corresponding twisting of the bar a between the pawl 64 and the pawl a In this manner the bar a will be twisted progressively from one end to the other and the pawls will be caused to assume their desired spiral relation.

It will be understood that while the invention is described herein with particular reference to the formation of frames for registers and the like it is applicable to the formation of other articles of manufacture which comprise a common support with a succession of radial members arranged in the spiral relation.

I claim as my invention 1. The method of making pawl frames and the like, having a succession of radial members extending from a common upport in a spiral relation, which consists in forming the support with the radial members in a straight series and then twisting the support progressively to cause the radial members to assume a spiral relation.

2. Themethod of making pawl frames and the like, having a succession of radial members extending from a common sup port in a spiral relation, which consists in milling a straight bar of suitable cross section to form the pawls or teeth in a straight series, and then twisting the bar progressively to cause the pawls or teeth to assume a spiral relation.

This specification signed this 19th day of April A. D., 1915.

CURTIS HUSSEY VEEDER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0.

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