US1894296A - Die head - Google Patents

Description

1933- H. T1 SHEAREI ET AL I ,2 6

DIE HEAD Filed Aug. 21.1929 s Sheets-Sheet 1 Harry Shearer ebarlesflfleimschis el Jan. 17, 1933. H 'SHEAR'ER ET AL 1.894296 DIE HEAD Filed. Aug. 21. 1929 5 Sheet-Sheet 5 gww'n tow 1 HarryTS/wamr U/mr/esAfiei/wc/ussel ml (It M49411 I Patented Jan. 17, 1933' UNITED STATES PATENT OFFICE HARRY '1. SHEARER AND CHARLES A. BEIMSCHISSEL, OF WAYNESBORO, PENNSYL- VANIA, ASSIGNORS TO LANDIS MACHINE COMPANY, OF WAYNESBORO, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA DIE HEAD Application filed August 21, 1929. Serial No. 387,499. A

Our invention relates to die heads, and parholding or driving unit and to provide means wherebythe front unit may float relative to the rear or holding and driving unit; and to provide further that the locking and driving members shall be independent of each other. i glgi' A further object is to provide a die head in which a floating action is secured to the locking members and in which the locking members are contained in the floating unit and are not influenced by the holding or driving unit.

A further object of the invention is to provide a die head wherein the locking means is permitted to float with the thread cutting carrying means, and wherein the thread cutting carrying means and locking means are permitted to float relative to the die head holding sha A further object of the invention is to pro-- vide a die head having a floating front unit in which the locking mechanism is unaffected by the floating of the front unit.

A further object of the invention is to provide a die head composed of two units in which the front unit is driven by pins on the rear' unit, so that the driving or resultant forces are carried by the pins instead of by the closing and locking means.

, In constructions heretofore used, the locking pins bore the resultant forces of the cutters, such constructions being shown and described for example in Patent #1,631,556 to Harry'T. Shearer and in Patent #1,692,- 514 to Samuel F. Newman and James G Harper.

In constructions heretofore shown as in Patent #1599994 to Harry T. Shearer, the resultant forces of the cutters are carried by the trunnions and the worm connected to the driving shank or body whereas in this construction, the resultant forces are carried by pins in the holding or driving unit which are independent of the trunnions, locking pins or worms and at the same time this allows the opening action of the head to be the pull-ofl type or self-contained without relying on mechanical means such as spiders, yokes, cams, etc.

Further general objects are to provide a die head in which the cutting and locking members float relative to the driving shank or driving member, and wherein misalignment of the work will not afl'ect the locking means.

A further object is to provide a die head in which the resultant forces of cutting threads do not act through the locking means to the holding shank or driving member.

A still further object is to provide a die head employing tan ential chasersr .d trunnions'mounted in a ody carrying tne same, in which the unit carrying the cutting members allgns itself with the stock being cut, which stock can be eccentric with the shank or driving member without causing a rocking action upon the locking pins.

Further objects and advantages will become apparent as the description proceeds.

Referring to the accompanying drawings,

which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a lateral sectional view of the die head in locked closed position taken on l1ne 11 of Fig. 2 and on line 11 of Fig. 3. F gure 2 is a section on line 2-2 of Fig. 1. F gure 3 is a face View of the die head. Figure 4 is a section on line 4-4: of Fig. 2, showing the parts in closed position.

Figure 5 is a section on line 5-5 of Fig. 2 showing the parts in open position.

Figure 6 is a section on line 66 of Fig. 2 showing the parts in closed position.

Figure 7 is a view on line 7-7 of Fig. 2, showing the parts in closed position.

Figure 8 is a section on line 8-8 of Figure 2, showing the parts in open position.

Figure 9 is a view looking in the direction indicated by arrows on line 9-9 of Figure 1. Figure 10 is a section of line 1010 of Fig. 9.

- of Figure 12 showing parts in closed position.

Figures 15 and 16 are sections on line 1515 of Figure 12 and show positions of rings mounted on shank in open position and at point of opening position respectively.

In the drawings, numeral 20 indicates the body member of the front unit of the die head having an opening ring 21 surrounding the front end, and an adjusting ring 22 surrounding the head body member just to the rear of the opening ring, said opening and ad justing rings having mounted therein opening means comprising a pin 23 on one ring and an abutment 24 on the other and a spring 25 acting against the pin on one end and against the abutment on the other and adjusting means comprising a worm 26 and a worm gear 27 as shown in Figure 2 same being shown and described in Patents #1,631,556 and #1,692,514. The body member 20 has a flange 28 made integral therewith, for holding the opening ring from forward movement on the head body. A ring plate 29 is secured to the rear of the body member 20. Pins 30 are secured in the body member 20 (Figure 8) and serve to take the resultant force of threading-and will hereinafter be more fully described. Chaser holders 31 carrying tangential chasers 32 are mounted upon trunnions positioned in bores in the front head body member 20 and pivotally connected by means of pins 33 and block 34 to the opening ring 21 so that relative rotation of the opening ring and the front head body member will open and close the thread cutting jaws or chasers. The extended ends of the trunnions 35 pass through the rear ring plate 29 and are secured by means of nuts 36 and lock screws 37 having a conical end which seats in a correspondin conical cavity in an end of the trunnion. locking ring 38 has mounted therein blunt end pins 39 which extend through bores in the adjusting ring 22 into bushings 40 in the ring 21. Ring 38 is connected to the adjusting ring 22 by means of screws 41 and spring 41; the screws 41 pass through bores inring 38 and screw into ring 22. These screws and springs serve to position ring 38 and blunt end pins 39 in their locked closed position. The front unit com rising all the above numbered and dBSCII ed parts because of clearances 424344-45 and 45' is free to float in relation to holding or driving member 46 and its component parts. The holding or driving member 46 has a projecting flange 47 in which are mounted rods '48 46 to aid in the floating action of the front unit, flange 52 also forming a stop for ring 38 when the remainder of the front unit moves forward in opening action. Member 46 has bores 54 to receive pins 30 said bores being of such size as to make clearances 45 about the ends of pins 30, said bores and pins constituting the means for taking the resultant cutting forces.

The die head is in locked closed position as shown in Figure 1. The driving and holding member 46 is fastened into a machine (not shown) performing the threading or other work in combination with the threading and the die head is advanced upon the work through the medium of member 46. The die head having cut the proper length of thread member 46 is stopped in its axial travel by means (not shown) the chasers being engaged in cutting screw threads draws the front unit comprising body member 20, rings 212229-38 and all their integral parts forward causing a separation as shown in Figures 5 and 8, this separation being made against compression springs 51. The ring 38 being stopped in its travel by flange 52 withdraws pins 39 from the bushings 40 allow-- ing the ring 21 to rotate, which rotation effects the opening of the head; and parts take positions as shown in Figures 5 and 8. A return of the parts to the locked thread cutting position is obtained by rotating ring 21 for which purpose a handle 58 is shown the head taking its locked closed position as shown in Figure 1, when bushings 40 align themselves with pins 39.

It will be noted that as the opening action takes place springs 51 acting between the holding and driving member 46 and the body member 20 brings body member to the same position as taken by this member when the die head is closed and that ring 38 takes a position independent of the remainder of the front unit as shown in Figures 5 and 8, also that a clearance is provided at 56 to permit ring 38 to move a part of the movement which the front unit takes relative to the rear unit.-

The above description applies to the die head as shown in Figures 1 to 10 and we have shown a modification of this die head in Figures 11 to 16. The die head shown as a modification works essentially in the same manner as the die head shown in Figures 1 to 10 exmounted in chaser holders 31' which are detachably mounted on trunnions 35' also ring 38 has a plate 38 attached to it which in conjunction with flange 52' limits the movement of ring 38. The head in Figures 1 to 10, as described in the above paragraph operates so that as the opening action takes place, springs 51 acting between the holding and driving member and the head body member brings the body member to the same position taken by this member when the'die head is closed. In the modified die head, shown in Figures 11 to 16 the ring 38 prevents the body member from assuming its closed position until such time as ring 21' is rotated and bushings 40 come into alignment with pins 39. To limit the travel of front unit on modified die head a split washer 57' surrounds a recess on rod 48'.

It will be obvious to those skilled in the art that various changes may be made in our device without departing from the spirit of the invention, and we therefore, do not limit ourselves to what is shown in the drawings and described in the' specification but only as set forth in the appended claims.

Having thus fully described our said invention, What we claim as new and desire to secure by Letters Patent, is:

1. A die head comprising a body member, trunnions mounted in the body member, chaser holders mounted on the trunnions, tangential chasers in the holders, a plurality of rings surrounding the said body memher, one of said rings being connected to the said chaser holders, means in said rings for opening and adjusting the die head, the said rings being positioned laterally of said body member by a flange on the body member, and a ring plate attached to the said body member, a ring carrying locking pins connected to the said plurality of rings and rotatable about the body member with said plurality of rings, said ring being positioned on a shank slidably connected to said body member, the said ring being limited in its axial movement relative to said shank in both open and locked position substantially as set forth.

2. A thread cutting die head comprising a front unit and a rear unit, the front unit carrying an opening ring, an adjusting ring and chaser holders carrying tangential threadcutting chasers, the rear unit carrying a locking ring, blunt end pins mounted in said locking ring for locking the die head in operative position, clearance provided between said locking ring and rear unit whereby the front unit may have a floating action in relation to the rear unit to care for misalignment of work, driving pins mounted in said front unit registering in boresin said rear unit, and means whereby an axial movement of the front unit relative to the rear unit withdraws the blunt pins from locked position, and means for opening the heads when the said blunt end pins are withdrawn, substantially as set forth.

3. A thread cutting die head comprising a front unit having a body portion with an opening ring and an adjusting ring mounted thereon, a rear unit having a body portion with a locking ring mounted thereon, blunt end pins carried by said locking ring, said pins engagingbores in the opening ring to hold said opening ring in locked position,

pins carried by the front body member extending into bores in the rear body for driving the former by the latter, and resilient means for holding the front and the rear body members together yieldably to permit a slight axial movement therebetween, such movement permitting the withdrawal of the blunt end pins from the bushings in the opening ring, and means for opening the head when the said blunt end pins are withdrawn, substantially as set forth.

4. A thread cutting die head comprising a front body member having opening and adjusting rings mounted thereon, a flange on the front portion of the body member, a plate secured to the rear of the body member for securing the rings on the body member, a shank orv holding member having a locking ring mounted thereon, a flange on the front portion of the shank to limit the forward movement of said locking ring, a plurality of pins secured in the said shank and extending into bores in the front body member, springs surrounding said pins engaging heads on the pins at one end and the said plate on the rear of the front body member at the other end, said springs tending to hold the front body member and said shank together, said locking ring carrying blunt end pins the ends of which engage in bores in the opening ring to lock the opening ring in thread cutting position, the faces of said blunt end pins holding the front body member and the rings mounted thereon from said shank when the head is in open position, substantially as set forth.

5. A thread cutting die head comprising a front unit "and a rear unit, the front unit carrying an opening ring, an adjusting ring and chaser holders carrying tangential thread cutting chasers, the rear unit carrying a locking ring, blunt end pins mounted in said locking rlng for locking the die head in operative position, said front unit registering in bores in said rear unit,'and means whereby an axial movement of the front unit relative to the rear unit withdraws the blunt pins from locked driving pins mounted 111,

connected to said body member,

rings surrounding the said body member, one of said rings being connected to the said chaser holders, ing and adjusting the die head, a ring carrying locking pins connected tothe said plurality of rings and rotatable about the body member with said plurality of rings, said ring being positioned on a shank the said ring being movable axially of the shank and limited in its axial movement relative to said shank in both open and locked position, substantially as set forth.

7. A thread cutting die head comprising a front unit and a rear unit, the front unit carrying an opening ring, an adjusting ring and chaser holders carrying tangential thread cutting chasers, the rear unit carrying a locking ring, blunt end pins mounted in said locking ring for locking the die head in operative position, driving pins mounted in one of said units registering in bores in the other of said units, and means whereby an axial movement of the front unit relative to the rear unit withdraws the blunt pins from locked position, and means for opening the heads when the said blunt end pins are withdrawn, substantially as set forth.

In witness whereof, we have hereunto set our hands and seals at Waynesboro, Pennsylvania this ninth day of August, A. 1). nineteen hundred and twenty-nine. I

HARRY T. SHEARER. CHARLES A. REIMSOHISSEL.

means in said rings for openslidably

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