US284633A

US284633A - haevey

Info

Publication number: US284633A
Authority: US
Publication date: 1883-09-11
Anticipated expiration: 1900-09-11

Description

(No Model.)

H. A. HARVEY.

MACHINE FOR ROLLING THE THREADS OF WOOD SCREWS.

No. 284,633. Patented Sept. 11, 18-83.

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UNITED STATES PATENT OFFICE.

HAYIVARD A. HARVEY, OF ORANGE, NEW JERSEY.

MACHINE FOR ROLLING THE THREADS OF WOOD-SCREWS.

SPECIFICATION forming part of Letters Patent No. 284,633, dated September 11, 1883.

' Application filed May as, 1883. (No model.)

To aZZ whom it may concern:

Be it known that I, HAYWARD A. HARVEY, of Orange, New Jersey, have invented an Improvement in Machines for Rolling the Threads of Wood-Screws, of which the following is a specification.

My invention relates to the class of screwthreading machines in which the thread is formed by causing the blank to be rolled along the curved face of a stationary die having suitably inclined ribs by the action upon it of a cylindrical rotating die having corresponding oppositely-inclined ribs formed upon its face; and my invention consists in giving to the stationary die the capacity of yielding in a direction perpendicular to the axis of the rotating die. The desirableness of giving to the stationary die this yielding capacity arises from the fact that the ordinary iron'wire of commerce is now drawn in such extremelengths that the opposite ends of a coil exhibit considerable differences in diameter. By making my concave-faced die yielding and supporting it by powerful springs I am enabled to roll screwthrcads upon blanks of varying sizes without crushing the larger blanks and without the clogging of the machine, which has heretofore sometimes been caused by the presence of an unusually large blank.

The accompanying drawings, representing the parts of a machine for rolling screwb1anks which are necessary to exhibit the application of my invention, areas follows:

Figure 1 is a top view, showing one of the cylindrical rotating dies and the concave-faced yielding die. Fig. 2 is a vertical section'through the line a" m 011 Fig. l.

I have not deemed it necessary to show in the drawings any more than a pair of the dies employed, as the machine for rolling screwblanks is fully described in my Patent No. 223,730, of January 20, 1880.

The rotating cylindrical die A is affixed to the upper end of the vertical shaft A in the same horizontal plane with the usual concavefaced die, B. The concave-faced die B rests upon the horizontal bed or table 0, andis tapped in the center of its convex side to receive' the check-bolt D, the shank of which is inserted through the concave flange E, which is cast upon or otherwise fastened to the bed or table upon which the concave die rests. The object of the boltD is to limit the range of movement of the die B toward the rotating die. The position of thedie B with relation to the rotating die is determined by means of the adjusting-screws F and F, for which holes are tapped horizontally through the flange E in directions which are radial in relation to the rotating cylindrical die. The inner ends of these screws bear upon the convex sides of stiff curved spring-plates G and G, the ends of which bear, respectively, either upon the convex face of the die B, or, if desired, upon other curved spring-plates, g g, interposed between the convex face of the die B and the spring-plates G G. By turning in the adjusting-screws F F the die B may be moved toward the rotating die until the under side of the head of the screw-bolt D brings up against the exterior face of the flangeE.

The machine is operated in the same way as my machine shown and described in my Patent No. 223,730, of January 20, 1880, with respect to the method of feeding the blanks to it and the operations which it performs upon I the blanks; but by means of my present invention the dies are adapted to roll screwthreads upon blanks which may vary sensibly in diameter. To that end-I make the springs which I have described sufficiently stiff to hold the curved die firmly enough to enable the ribs upon its face to impress the grooves of the desired depths in the body of the blank, while at the same time, if a large blank should get into the machine, the springs will yield slightly, and thus the large blank will go through the machine and have the thread formed upon itsbody without either being crushed or stopping the machine.

I claim as my invention 1. In that class of screw-threading machines in which a blank'is made by the action of a rotating cylindrical die to roll across the concave face of a stationary die, mechanism, substantially as herein described, whereby the concave die is given the capacity of yielding in a plane perpendicular to the axis of rotation of the rotating cylindrical die, as and for the purpose set forth.

drical die A and the concave-faced die B,

2. In combination with the rotating cylin having the capacity of horizontal movement I suitable perforation in the flange E, in combitoward and from-the rotating die, the adj ustnation with the adj usting-screwsF and F and ing-serews F and F, inserted horizontally the springs interposed between the inner ends through the flange E; and suitably curved of the adjusting-screws and the concave-faced 5 spring-plates interposed between the ends of die, as and for the purpose set forth.

the adjusting-screws F and F and the convex 4 face of the dieB, as and for the purpose set HARVEY forth. Vitnsses:

3. The concave-faced die 13, provided with E. H'. VVILLIAMs, 10 the cheek-screw D, loosely inserted through a R. O. HOWES.