US1182970A - Thread-cutter. - Google Patents

Description

R G. BROWNELL.

THREAD CUTTER.

APPLICATION FILED OCT. 21. 1914.

Patented Mayl, 1916.

THE COLUMBIA PLANoulAPH 00-, WASHINGTON, D. C.

R. G. BROWNELL-1 THREAD CUTTER. APPLICATION FILED 001. 21. 1914.

" 1 1 16111611 May16,1916.

2 SHEETS-SHEET 2.

7 11-15 COLUMBIA PLANOGRAPH :0. WASHINGTON, D. L.

RAYMOND e. BBOWNELL, or CHICAGO, ILLINOIS.

THREAD-CUTTER.

Specification of Letters Patent.

Patented. May 16, 191

Application filed October 21, 1914. Serial No. 867,756.

To all whom it may concern:

Be it known that I, RAYMOND G. BROWN- nLL, a citizen of the United States, and a resident of the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Thread-Cutters, of which the following is a specification.

My invention relates to improvements in thread cutters, and more especially tothread cutters adapted for use in threading pipes, the object of the invention being to provide a simple, cheap, compact and eflicient construction for the purpose.

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which,

Figure 1 is a rear elevation of a construction embodying-my invention shown in position for use, Fig. 2, a front elevation of the same with portions broken away and others shown in section, Fig. 3, a horizontal section of the device, and Fig. 4, an enlarged detail view of a clamping vise employed in the construction.

The preferred form of construction as illustrated in the drawings comprises a base plate 5 adapted to be secured to the top of a table or bench 5 adjacent the edge there of, said base plate being provided with upstanding posts 6, as indicated. The posts 6 are made of a size and shape to fit snugly within sockets 7 formed upon the rear of a circular plate. 8, said sockets being provided with set screws 9 for securing said plate to said posts, as will be readily understood. A casing 10 is secured to the outer face of plate 8 and is provided with a central opening closed by a diametrically split plate 11. A hollow spindle 12 is rotatably mounted in plates 11 and 8, as shown in Fig. 3, said spindle being provided at one end with a die holder or box 13 adapted to receive and hold an ordinary solid thread-cutting die and permit movement of said die while cutting a thread. The outer end of holder or box 13 is closed by a plate 1 1 having a central opening 15 therein for the passage of the end of a pipe. Spindle 12 is formed with an octagonal collar 16 and a large internal gear 17 inclosed in casing 10 and 17 and 19, but of a size to mesh only withone.

Gear 20 is secured to the end of a shaft 21 eccentrically mounted in an eccentric 22 and provided with a crank handle 23'for rotating the same. Eccentric 22 is provided with an adjusting arm 2 1 by means of which said eccentric may be rotated in its bearing in casing 10. The arrangement is such, that by shifting eccentric 22, gear 20 may be shifted laterally to mesh with either of the gears 17 or 19, as desired, thus permitting of the rotation of spindle 12 at a slow or at a comparatively high speed.

Ribs or strips 25 are formed upon the rear face of plate 8 and a clamping block 26 is adjustably .arranged between said ribs, said block being provided witha clamping jaw- 27 adapted to contact with the under side of a pipe or similar article extending through spindle 12. The block 26 is secured in adjusted positions by means of screws 28 adapted to engage threaded semicylindricalnotches 29, 30, 31, 32 and 33 formed in the corresponding edges of said block and ribs 25 when in registration with each other. Each cooperating pair of notches is of a size and thread to receive one of the screws 28 when brought in registration with each other, and the notches are so spaced as to permit of adjustments of block 26 to receive the usual standard sizes of pipes, as will be readily understood. A vise jaw 34: is slidable in a guide 35 formed on the rear of plate 8 and has its upper end swiveled to the end of an adjusting screw 36 threaded in a lug 37 also formed on the rear of plate 8. Screw 36 is provided with an operating handle 38 by means of Which pipes positioned centrally in spindle 12 may be tightly clamped and held in such position. The arrangement is such, that the clamping block 26 may be readily adjusted for different sizes of pipes and different sizes of pipes inserted in die holder 13, the clamps 37 and 34 serving to position the pipes accurately with respect to the die, thus dispensing with the necessity of guides. When cutting the thread, gear 20 is shifted into mesh with the internal gear 27 thus obtaining a slow speed and large leverage for the cutting operation. When the actual cutting is finished, gear 20 is shifted into mesh with gear 19 so that the die may be run off of the pipe rapidly. Likewise when it is only desired to clean out a thread, the gear 19 may be used and thus a high speed 0btained.

The construction is simple, compact, efficient and may be manufactured very economically.

WhileI have illustrated and described the preferred form of construction for carrying my invention into efiect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

1. A thread cutter comprising a casing adapted to be detachably secured to a table; a rotatable hollow spindle extending centrally through said casing; a die holder at one end of said spindle; an adjustable vise formed at the other end of said spindle; a large internal gear in said casing and attached to said spindle; a spur gear in said casing attached to said spindle; an eccentric mounted in the wall of said casing be tween said spur and said internal gears; a shaft rotatably mounted in said eccentric; a gear on said shaft adapted to mesh with either said internal gear or said spur gear; a crank handle for operating said shaft;

copies of this patent may be obtained for live cent: each, by addressing the and an arm for operating said eccentric, substantially as described.

2. The combination with a rotatable die holder of an adjustable vise cooperating therewith, said vise comprising a slidable block provided with a clamping jaw, the edges of said block and the guard therefor being provided with registrable notches for securing them in adjusted relations, substantially as described.

3. The combination with arotatable die holder of an adjustable vise cooperating therewith, said vise comprising a slidable block provided with a clamping jaw, the edges of said block and the guard therefor being provided with registrable semi-cylindrical threaded notches for securing them in adjusted relations; and screws threaded in said notches, substantially as described.

4. A thread cutter comprising a casing; a rotatable hollow spindle extending through said casing; a die holder at one end of said spindle; a vise at the other end of said spindle; a large internal gear in said casing and attached to said spindle; a spur gear in said casing attached to said spindle; a driving gear in said casing between said first mentioned gears; means for shifting said driving gear into and out of engagement with said first mentioned gear; and means for driving said driving gear, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

RAYMOND G. BROWVN ELL.

Witnesses:

JOSHUA R. H. POTTS, JANET E. FARRELL.

Commissioner of Patents,

Washington, D. G.

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