US1232708A - Thread-cutter. - Google Patents

Description

Y J. CMMOONL THREAD CUTTER.-

APPLICATION man mum. I916.

mawwu Patented July 10, 1917.

2 SHEETS-SHEET I.

J. C. MOON.

THREAD CUTTER.

, APPLICATION FILED MAYIB, I916.

Patented. July 10, 1917.

2 SHEETS-SHEET 2 I f/W/WW J /1 6 New clarion.

JOHN C.' M OOI\T, ST. LOUIS, MISSOURI.

THREAD-GUTTER. I

' m mew re Patented July 11l,191'?.

f Application filed May is, 1916. semin eama To all whom it may concern: j Be it known that I, J OHN C. MooN, a citizen of the United States, residing at thecity of St. Louis, State of Missouri, have in vented a certain new and useful Improve. ment in Thread-Cutters, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it apperta'ins' to make and use the same, reference being had to the accompanying drawings, forming part ,of this specification, in which- Figure 1 is a sideelevational view of my improved pipe threading machine.

' Fig. thereof.

Fig. 3 is a vertical sectional view through the device for clamping the rod or pipe to be threaded.

Fig. 4 is a side elevational view partly in section of said clamping device.

This invention relates to a new and useful improvement in thread cutters for cutting threads upon theends of rods or pipes, the object bein to construct a machine of the character escribed which will simultaneously cut threadson both ends of the rod afterward pointed out" in the claims.

' bench; or "table on which are mounted two'castings 2 forming bearings for shafts 3' which derive motion through 'themediu'm of pulleys 4 v or pipe. With these objects in view, my invention consists in the construction and arrangement and combination of the several parts, all of which will be described and In he drawings, 1'1nd1catesf -a" and belts 5,,sa1dshafts being driven in opposite directions. The inner end of each shaft is made hollow and provided with a flange 3 (see Fig. 4) the face of which flange is provided with guides to receive radially movable cuttersor chasers 6. These cutters are held in position by suitable bolts 7 and are slotted lengthwise so as to permit inward and outward movement. Springs 8 are arranged in the slots with their inner ends resting against bearing blocks which! are seated upon the bolts 7, the energies of said springs beingv directed at all times to move the cutters outwardly. The periphery of flange 3' is also provided with grooves forming uide ways for longitudinally movable bloc (s 9, the latter being provided with inclined or beveled outer ends which are designed to engage the inclined outer ends of the cutters 6, and force the same inwardly is a top plan view of a portion- 7 intoicutti11g position. Blocks 9 are confined by the flangeof a sliding collar 10 mounted on the inner end of'shaft 3, said sliding collar'beingkeyed to the shaft so as to rotate therewith-and having an annular groove in wh1'ch fit the prongs of a bracket 11 (see Fig. 2), which bracket" is 'slidingly mounted upon arod 12. The rod 12 is secured in suitable lugs 2 on thecastings 2 and carries collars 13 adjustably mounted thereon. The purpose of the construction above described is asfollows:

When the shaft 3 is being retracted or moved outwardly, the parts are in the full line position shown in Fig. 4. in which the cutters Goocupy their outer position. The

continued outward movement of the shaft twill cause the yoke or bracket 11 to contact withthe outermost collar 13, whereupon the collar 10 will have a relative inward movement on shaft 3, causing the inclined outer the thread will be cut thereon until the yoke or bracket 11 strikes the innermost collar 13' when the'collar 10 will be moved relatively back. on shaft 3, permitting the cutters to open and thus enablin the quick ,retractive movement of the sha t 3 and its carried arts.

The aiiove description applies tothe construction at each end of the machine, there being two cutters, one for operating on opposite ends of the same rod or pipe, and, as before stated, these cutters are, intended to be rotated in opposite directions in order to properly cut the threads.

, The. means for feeding the cutters inwardly and then retracting them consists of operating handles 15 (see Fig. 1)- connected to a pinion 16 mounted in fixed bearings, which pinion cooperates with racks 17 on the ends of the oppositely extending rods 18. The outer ends of these rods are connected to levers 19 pivoted in suitable brackets 20 secured to bed plates 1, the upper ends of levers 19 being pivotally connected to collars 21 loosely mounted upon the shanks of llti yokes 22 which latter are pivoted to the ends of shafts 3. Jam nuts 23 hold these collars 21 in position.- When the handles 15 are moved in a clockwise direction, the shafts 3 will be moved inwardly. When this cutting action is completed, the cutting jaws 6 will be moved outwardly and the handles 15 can be quickly moved in a counter-clockwise direction so as to move the shafts 3 outwardly in readiness for another operation. The operator can of course feel the cutting action on the inward movement of the shaft and assist such action by pressure on handles 15 which pressure is necessary in starting the cutting.

The means for holding the pipe or rod in position to be operated upon is best shown in F igs. 3 and 4, wherein it will be observed that a bearing block 25 is supported by a downward extension of the frame work which supports the table 1. This bearing block, or rather these two bearing blocks, as the mechanism for clamping the rods or pipes in position, about to be described, is duplicated for each end of the rods or pipes, provides a pivotal support for arms 26 extending through openings in the bed plate 1. 27 indicates a cam keyed to the shaft 28, on one end of which shaft is arranged an operating handle 29. 30 indicate clamping blocks pivoted at 31 between the arms 26 and having rollers 32 at their lower ends which cooperate with the cam 27. These clamping jaws are bifurcated at their lower ends between the prongs of which bifurcations said rollers 32 are mounted and in which bifurcations the cam 27 operates, as shown in Fig. 3. Clamping jaws 30 are connected together at their lower ends by means of springs 33 so that the rollers 32 are at all times in yielding engagement with the cam 27. The upper ends of the clampingjaws 30 are provided with semi-circular recesses 30 which are designed to register with correspondingly shaped recesses 26 formed in the opposite side edges of a cross bar 26, which connects the upper ends of the arms 26. The pipe to be threaded is indicated at A. in Fig. 3, and the pipe being threaded, or in position to be threaded, is indicated at B. in said figure. When the parts arein the position shown in Fig. 3, it will be observed that the clamping jaw at the left is open to receive the pipe A. (or if said pipe had previously been threaded, to permit its removal, and the introduction of an unthreaded pipe in position), and that the clamping jaw at the right is in clamping position holding the pipe B. against rotation, while it is being threaded. The cam 27 forces the clamping jaws into clamping positionand springs 33 open either companion jaw when its companion is in clamping position.

Thus it will be seen that the clamping action of the jaws is positive, it being possible to exert considerable power on the clamping jaws through the cam, while the opening movement of the aws depends upon the spring action.

In order to determine the alinement of a pipe or rod with the cutters 6, there is a stop 26 on each side of one of the arms 26 which stop cotiperates with the brackets 34 mounted on the bed plate 1. These brackets 34 may be adjustably mounted upon the bed plate 1 by slot and pin connections to enable their inward and outward adjustment, or removable plates 35 may be arranged to coiiperate with the faces of stops 26. This alinement of the pipe or rod to be threaded with the cutters 6 is quite important and the stops for arresting the arms 26 in their extreme position must be accurately placed. The handle 29 serves as a means for rocking the arms 26 to and froand for this purpose it is only necessary for the operator to pull the handle toward him or push it away from him until the arms are arrested 'by their respective stops; then, by depressing or lifting the arm, as the case may be, the pipe which has been threaded is released, and the pipe to be threaded is clamped in position. The released pipe may be removed and another pipe to be threaded placed in position in the jaws of the opened clamps. It is immaterial whether the arms 26 are first rocked and the handle 29' then depressed or raised, or the handle first depressed or raised and the arms 26 then rocked,this is optional with the operator and the sequence of operations is consequently left to his discretion.

The clamping jaws are duplicated for each end of the pipe, and in order that they may be moved in unison, the shaft 28 is extended from one side of arms 26 to the other and, furthermore, said arms are connected together by a bracket 36 (see Fig. 4) so'that they Will move in unison.

In order to position the pipes or rods to be threaded, I provide two stops 40 (see Fig. 2)

shafts toward or away from each other and stops for limiting the lengthwise movement in both directions of the cutter actuating means carried by each shaft whereby the continued movement of the shaft effects an 'inwa'rd or outward movement of said outends of which cutters are inclined, a member carried by and movable longitudinally upon each shaft, parts of which member are inclined and bear directly against the inclined outer ends of the cutters, manually operable means for simultaneously moving both shafts toward or away from each other and stops for limiting the movement of the cutter actuating members upon the shafts in one direction so that the continued movement of the shafts will effect an inward movement of the cutters, and yielding means for moving the cutters outwardly.

3. In a machine of the character described, the combination of a rocking arm, a pair of clamping jaws pivotally mounted thereon and cooperating therewith, and means for, rocking said arm, said means also controlling the opening and closing movement of said clamping jaws.

4. In a machine .of the character described, the combination of a rocking arm, stops for limiting its rocking movement in each direction, a pair of clamping jaws pivotally mounted on said arm and cooperating therewith to grip a pipe or rod to be operated upon, a cam for controlling the opening and closing movement ofsaid jaws, and means for holding said jaws in operative relation to said cam.

5. In a machine of the character described, the combination of a rocking arm, sto s for limiting its rocking movement in eac direction, apair of clamping jaws pivotally mounted on said arm and coiiperating therewith to grip a pipe or rod to be op- T erated upon, a cam for controlling the opening and closing movement of said jaws, a handle for rocking said arm and moving said cam and springs connected to said jaws whereby they are held in yielding operative relation to said cam.

6. In a machine of. the class described, the combination with two positively revolving shafts, of means for moving said shafts toward and away from each other, cutters carried by said shafts, means for rendering said cutters effective or inefiective, and pipe gripping means arranged between the inner ends of said shafts, which gripping means com prises a rocking arm, a pair of clamping jaws pivotally mounted thereon and 00- operating therewith, and means for rock ing said arm, which means control the opening and closing movement of said clamping aws.

7. In a machine of the class described, the combination with a pair of oppositely disposed thread cutters, of pipe'gripping means positioned between said cutters, which gripping means includes a rocking member, a pair of clamping jaws pivotally mounted on said member and cooperating therewith to grip a pipe or rod to be threaded, and means for rocking said member, which means control the opening and closing movement of the clamping jaws.

In testimony whereof I hereunto afiix my signature in the presence of two Witnesses, this 15th day of May, 1916.

JOHN C. MOON.

Witnesses:

I M. P. SMITH,

M. A. HANDEL.

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