US653897A - Thread-protector. - Google Patents

Description

Patented July l7, 1900. M BLAKEY I THREAD PROTECTOR. (Application filed Jan. 223, 1900 1 (No Model.)

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NlTED STATES PAT NT OFFICE.

MILDRED BLAKEY, OF ROME, OHIO, ASSIGNOR TO THE NATIONAL TUBE COMPANY, OF NEW YORK, N. Y., AND MCKEESPORT, PENNSYLVANIA.

TH READ-PROTECTOR.

SPECIFICATION formingpart of Letters Patent No. 653,897, dated July 17, 1900. l

Application filed January 23; 1900. Serial No. 2,478. (No model.)

To all whom it may concern:

Be it known that I, MILDRED BLAKEY, a resident of Rome, in the county of Ashtabula and State of Ohio, have invented a new and useful Improvement in Thread-Protectors; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to thread-protectors, its object being to provide a simple form of thread-protector which while screwing onto the tubing or bolts can be produced from a rolled strip'having a very thin body, and yet which is sufii'ciently braced to withstand the ordinary shocks and jars to which tubing is subjected in handling and transportation.

The thread-protector embodying the invention is formed of a thin integral wroughtmetal band having two or more ribs extending inwardly at intervals therefrom of greater height than the threads to be engaged, the upper edges of such ribs being V-shaped, so as to form screw-threads, the preferred forms of thread-protectors as produced having the entire bodies of the ribs formed V-shaped, and the ribs not only forming by their upper edges screw-threads to engage with the threads of the pipe or bar, but bracing the body of the protector and giving it sufficient rigidity for the purpose, while on account of the height of such ribs space is provided for the reception of rivets or other fastening devices between the ribs for securing the ends of the annulus or band together.

To enable others skilled in the art to make and use myinvention,l will describe the same more fully, referring to the accompanying drawings, in which- Figures 1, 3, and 5 are perspective views of different forms of protectors embodying my invention; and Figs.'2, 4, and 6 are sectional views of the same, illustrating their application to tubing.

The thread-protector embodying the invention is formed of a strip of wrought iron or steel having ribs rolled on one face thereof, this strip being cut to length and bent to form the annulus or band and the ends connected together in any suitable way. As illustrated in the drawings-the body portion of the protector can be made of very thin metal, being for some sizes practically as thin as ordinary sheet metal, as the protector is strengthened and braced by the ribs, so that notwithstanding its thin body it is sufficiently stiff for the purpose.

In the drawings, 1 is the body of the protector, on which are formed at suitable intervals the ribs 2, these ribs projecting inwardly and having their upper ends 3 formed V- shaped, so as to engage with the threads of the pipe or bar. It is preferred that these ribs shall be V-shaped in crosssection throughout, as in Figs. 1 to 5, as such form, while requiring but little more metal, increases the strength of the ribs and the bracing of the protector and provides an easier section to roll. For heavy sizes of the protector the lower portions of the ribs may be formed substantially at right angles to the body portion 1, as at 4 in Fig. 6, the V-shaped upper edges 5 resting on such rectangular portions 4. It will be noticed that between the several ribs are the spaces 6, it only being necessary to provide ribs to engage with every third or fourth thread of the tubing or bolt, and it will also be noticed that the ribs are of greater height than the depth or height of the threads of the tubing with which they engage. On account of, this extra height of the ribs an increase in rigidity of the protector is obtained through thebracing of such rib portions, while in addition to this between the ribs space is provided for v the reception of the rivets or like devices employed to secure together the ends of the strip from which the annulus is made. The ribs formed with the bodyare, in efiec't, bracing-ribs carrying on their upper edges V shaped portions to engage with the screw threads. The number of'such strengthening-ribs employed may vary. In Figs. land 2 I employ one rib near each edge, and I also prefer to bend down the edge portions 7 beyond the ribs slightly, so that in case the tubingprotector on the tubing contacting therewith should move longitudinally it will naturally slip up the inclined edge 7 of the protector, any tendency to knock it off the tubing being overcome. In Figs. 3 and 4 two ribs are placed near the edge of the protector, while in Figs. 5 and 6 one rib is placed near each edge and one in the center of the protector.

In the manufacture of the thread-protector when it is being bent into annular form it is given a slight offset or pitch, so that each rib is thrown into spiral form corresponding in pitch to that of the threads of the pipe or bar with which the protector is toengage. The ends of the band may be connected together in any suitable way. For example, in Figs. 1, 2, 5, and 6, slots 8 are formed in the ends of the strips and clips 9 fitted into the same and bent down upon the protectorbody. In Figs. 3 and 4 rivets 19 pass through the protector-body and a short connectingpiece 11. I am thus enabled to provide a thread-protector which is exceedingly light in weight, having a body made practically of sheet metal, and having integral therewith strengthening-ribs which give all necessary rigidity to the protector and in this way provide the threads for engaging with the pipe or bar, while providing full space for connecting up the parts of the strip from which the ring is made.

What I claim as my invention is-- 1. A thread-protector formed of a thin, integral, wrought-metal band having two or more ribs extending inwardly at intervals from its inner face of greater height than the threads to be engaged, the upper edges of said ribs being V-shaped so as to form screwthreads. V

2. A thread-protector, formed of a thin, integral, wrought-metal band having two or more V-shaped ribs extending inwardly at intervals from the inner face of greater height than the threads to be engaged, the upper edges of said ribs forming screw-threads.

3. A thread-protector formed of a thin, in tegral, wrought-metal band having two or more ribs extending inwardly from its inner face, the upper edges of the ribs being V- shaped, and the edge portions of the body be yond said ribs bent inwardly to form inclines.

In testimony whereof I, the said MILDRED BLAKEY, have hereunto set my hand.

MILDRED BLAKEY.

Witnesses:

M. A. OSBORN, U. R. OsBoRN.

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