US2586668A - Threading apparatus - Google Patents

Description

Feb. 19, 1952 Q LAEMMEL 2,586,668

THREADING APPARATUS Filed April 29, 1948 INVENToR. Aa/b5@ HM Patented Feb. 19, 1952 THREADING'" APPARATUS Charles H. Laemmel, Detroit, Mich., assignor, by

mesne assignments, to The Shelield Corporation, Dayton, Ohio, a corporation of Ohio Application April 29, i948, serial No. 23,999

2 claims. (ci. 10-95) This invention relates to thread cutting tools.

One object of the invention is the provision of a threading head having improved means for controlling the operation of a tool adjusting sleeve with respect to the holder in which the threading cutters are arranged, the construction being such that the sleeve is adjustable by a lever rotatable on a radial axis and having an eccentric pin operable in a transverse groove in the cutter holder which is also provided with a longitudinally extending pin receiving groove that permits retraction of the sleeve beyond its normal operating range in order that the threading cutters can be released and removed.

Y A further object of the invention is the provision of a threading die head' having a control lever operable about an axis extending radially of the head and held against other than rotational movement, the lever being arranged for rotation beyond its normal opening and closing rangeof movement to permit retraction of the chaser adjusting'sleeve to such an extent `that the chasers can be removed from the holder.

Other objects and advantages of the invention will be apparent from the following description, the appended claims and the accompanying drawing, in which:

Fig.` 1 is an end view of a threading head embodying the present invention; Y Y

Fig. 2 is a longitudinal section on the line 2-2 of Fig. 1;

Fig. 3 is a longitudinal section on an enlarged scale on the line 3-3 of Fig. 1;

Fig. 4 is a top plan view of the threading head showing the sleeve retracted to permit release of the chasers; and

Fig. 5 is a section on the line 5-5 of Fig. 3 and showing a portion of the holding plate.

vReferring more particularly to the drawing in which the preferred embodiment of the invention has been illustrated in its association with a self-opening threading die head having radial thread chasers, I generally designates a chaser holding body having suitable slots supporting the chasers or tools II for radial sliding movement therein. Coil springs I 2 acting on pins I3 carried by the chasers urge the chasers outwardly from the closed or threading position represented in Fig. 2 in the same manner as in the patent to France 1,777,380. An vadjusting sleeve I is axially movable on the body `I0 to open or release the chasers as in the patent just mentioned.

The body I0 preferably comprises a forward section I6 and a rearsection I1 xed to one another by suitable bolts, not shown, section I1 being slidably carried on the shaft I8` and urged Fig. 3, by means of springs 20. The left hand ends of springs 20 are received. in recesses-in a against which the end of the body portion I1 engages. part ofthe body portion I1 secures a threaded adjusting collar 23 in desired position so that when the relative axial movement of the Work and the threading head is stopped during a threading operation, the continued rotation of one of those parts draws the threading head forwardly against the action of springs to a predetermined point when the sleeve I 5 is moved to the right and the `dies are automatically opened by trip means of the character shown f sleeve so that the shaft can rotate about an axis extending radially of the threading head. Projecting laterally from .the shaft 25 is an operating arm 21 which can be moved from a closed or threading position shown at A in Fig. 4 to an open position indicated at B. The handle swings in a plane tangential to and above the die head so that pressure can very conveniently l be applied Yby the operator in closing the die head. The shaft 25 is. operably connected to the tool carrying body I 0 by means of a projecting pin 29 which is at, one side of the shaft axis. This pin operates in a transverse groove 30 in the body and the axial components of the pins movements are effective to close the die when the handle 21 is moved from the position B to position A indicated in Fig. 4. When the head is automatically opened at the end of a threading operation, the handle swings back to sleeve I5 as by means ofla screw 32.

position B as the sleeve I5 is moved rearwardly.

The shaft 25' is positively held against axial movement, while permitting its free rotation, by means of a holding plate 3| secured to the The two legs 33 of this plate enter opposed transverse slots 34 in the bushing 26 to fix the bushing against axial and rotational movement in the sleeve I5, legs 33 also entering the opposite sides of an annular groove 35 inthe shaft 25 to permit rotation of the shaft kwhile holding it in place against axial movement.

The swinging movements of the arm 21 are preferably limited in a positive manner by a stop o pin 36 on shaft '25 which engages a shoulder 31 towards the right on the shaft as viewed in i on the bushing 2B when the handle 21 swings towards the right some little distance beyond the position B shown in Fig. 4 but before it reaches a position in line with the shaft I 8.

In accordance with the present inventionthe handle 21 may be swung beyond its normal oper- YLock nut,22 threaded on the rear ating range if the operator .so desires, in order that the sleeve I may be moved towards the right far enough to entirely release the threading dies Il from the body I0, Without requiring the use of tools or disassembling any of the parts of the threading head. As previously mentioned, the stop pin 36 normally prevents this movement but pin 36 may, if desired, be intentionally depressed by the operator to permit continued travel of the arm 2l. For this purpose the pin 36 is slidably carried in a radial bore and held in its normal projected position by means of a spring Wire 39 arrangedin an annular groove 46 in the shaft 25, the end of this spring pressing against a head 4l on the pin to normally hold the pin projected but permitting the pin tok be moved back far enough so that it no longer engages the shoulder 31. The operator can thus move the handle to the position C shown in full lines in Fig. 4. pin 29 on shaft 25 is moved to a position in line with an axially extending slot 43 in the body Hl and this permits the sleeve l5 to be moved towards the right as viewed in the drawing to the position shown in Fig. 4 in which the ends of the slots that carry the chasers are entirely uncovered so that the chasers can be moved for resharpening or inspection, Without requiring the use of tools and Without requiring the disassembling of any of the parts one from another. Complete disassembly of the sleeve i5 from the body can be effected by unscrewing the nut 2|.

In this position the projecting When it is desired to close the threading head after reinserting the chasers, it is merely necessary to enter the pin'29 in the longitudinal slot until the pin 29 is inthe transverse slot 3B. The

handle 2 can then be swung 'clockwise' to the position B and then on to positionl A which Will Y.

close the die head. Before the handle reaches theposition B in moving from position C, the stop pin 36 will be uncovered and released so it may spring out to its normalposition again from the retracted position in which it is held bythe upper portion of the bushing 26.

vAs will now be'apparent,l the rotational movements of the shaft move the pin only in the transverse slot'SD during the normal operating range between. opening and closing position and it is only when the handle is rotated to a position beyond the normal operating range that pin 2Q can enter the longitudinal slot 43 and permit full retraction of the sleeve on the body to release the dies. In accordance with this invention, it will be clear, since the handle swings in a plane which is tangential of the threading head, that the required power can be conveniently 'applied even in dies of considerable size.

While the form of apparatus herein described constitutes a preferred embodiment of the invention, it is to be understoodthat the invention is not limited to this precise form of apparatus,Y and that changes may be made therein Without `departing from the scope of the invention which is dened in the appended claims, t

What is claimed is:

l. A self-opening threading head comprisin a body provided with means for guiding'threading tools foropening and closing movements, aY sleeve axially movableon said body through a normal operating range from opening to closing pos1t1on of the tools, a rotatable ShaftprOVided With a handle and an operating pin eccentric' .oi the shaft axis, vmeans on said sleevellqatbly.

-axis extending radiallyoffthe sleeve, means re taining said rotatable pin mounting shaft against movement along its axis, said body on its peripheral portion having a transverse groove receiving said pin so that the axial component of rotational movement of the pin in its normal operating range causes axial movement of the sleeve on the body, said body also having a pin receiving groove extending substantially axially of the body from a point on said transverse groove which is substantially beyond the pins normal operating range of movement, the bottom of the axial pin receiving groove lying inwardly of the geometric plane in which the bottom of the pin moves during normal operation to cause axial ino-vejment of the sleeve, the size relationship of said shaft, pin and transverse and axial grooves being such that the pin is movable from the transverse groove to the axial groove by rotation of the shaft beyond the limit of its normal operating range whereby the sleeve is retracted beyond its normal operating range of movement to release the threading tools when the pin is moved to a point on the transverse groove substantially beyond the pins normal operating range of move ment.

2. A vself-opening threading head comprising a body provided with means for guiding threading tools for opening and closing movements, a sleeve axially movable on said body through a normal operating range from opening to closing position of vthe tools, a rotatable shaft provided With a handle and an operating pin eccentric of the shaft axis, means on said sleeve rotatably supporting said shaft for movement about an axis extending radially of the sleeve, means positively retaining said rotatable pin mounting shaft against movement along its axis, manually releasable means positively stopping rotation of the shaft beyond a normal operating range, said body in its peripheral portion having a transverse groove receiving said pin so that the axial component of rotational movement of the pin inits normal operating range causes axial moved ment of the sleeve on the body, said body also having a pin receiving groove extending 'substan-l tially axially of the'body from a point on said transverse groove vwhich is substantially beyond the pins normal operating range of movement, the bottom ofthe axial pin receiving groove lying inwardly ofthe geometric plane in which theV bottom of the pin moves during normal operation to cause` axial movement of the sleeve, the size relationship of said shaft, pin and transverse and axial groovesbeing such that the pin is movable from the transverse groove to theaxial grooveV by rotation of thesh'aft beyond the limit of its normal operating range whereby the sleeve is retracted 'beyond its normal operating range of movement to release the .threading tools when the pin'is moved to a point onY the transverse groove substantially beyond the pins normal operating range of movement.

` CHARLES H. LAEMMEL.

REFERENCES CITED The vfollowing `references are of record in the le of this patent: l

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