US2760213A - Interconnected cam plates for operating chasers and work guide means - Google Patents

Description

1956 B. G. BJAL 2,760,213

INTERCONNECTED CAM PLATE OR OPERATING I CHASERS AND WORK GUIDE MEANS Filed June 30, 1955 4 Sheets-Sheet l INVENTOR.

Aug. 28, 1956 B. G. BJALME INTERCONNECTED CAM PLATES FOR OPERATING CHASERS AND WORK GUIDE MEANS 4 Sheets-Sheet 2 Filed June 30, 1955 R m. m m

Aug. 28, 1956 B. G. BJALME 2,760,213

INTERCONNECTED CAM PLATES FOR OPERATING CHASERS AND WORK GUIDE MEANS Filed June 30, 1955 4 Sheets-Sheet 3 ,/2 Id I 49 3 a l k INVEN'TOR.

Aug. 28, 1956 s. G. BJALME 2,760,213 INTERCONNECTED CAM PLATES FOR OPERATING CHASERS AND WORK cums MEANS.

Filed June 50, 1955 4 Sheets-Sheet 4 IN V EN TOR.

United States Patent INTERCONNECTED CAM PLATES FQR OPERAT- ING CHASERS AND WORK GUIDE MEANS Bengt G. Bjalme, Erie, Pa., assignor to Reed Manufactur ing Company, Erie, Pa., a corporation of Pennsylvania Application June 30, 1955, Serial No. 519,084

7 Claims. (Cl. 10-122) This invention is a quick opening pipe threader in which the movement of the chasers from open to closed or threading position automatically moves the guides into guiding position and maintains the guides tight against the pipe under a definite spring pressure even though the pipe is over or under size. In a preferred form, the automatic movement of the guides can be disconnected so as to permit manual setting of the guides.

In the drawings. Fig. 1 is a front view of a pipe threader; Fig. 2 is an exploded view; Fig. 3 is a fragmentary edge view; Fig. 4 is a back view; Fig. 5 is a front view of a modification; Fig. 6 is an edge view of the opening and closing device; Fig. 7 is a sectional elevation; Fig. 8 is a back view and Fig. 9 is an edge view showing the connection between the guide and chaser scroll or cam plates.

The threader has a front housing 1 having radial guideways or slots 2 for threading chasers 3, a guide housing 4 having radial guideways or slots for guide members 6 and a chaser scroll or cam plate 7 and a guide scroll or cam plate 8 in face to face engagement and interposed between the front housing 1 and the guide housing 4. The front and guide housings are fixed together and constitute the frame of the threader. The guide cam plate has spirally directed scroll cam members 9 which fit in notches 10 in the guides 6 and move the guides 6 radially inward and outward as the guide scroll plate 8 is rotated relative to the guide housing 4. The threading chasers 3 have similar notches 11 which cooperate with similar scroll cam members on the chaser scroll plate 7 so as to move the threading chasers 3 radially inward and outward as the chaser scroll plate is rotated relative to the front housing 1. The chaser and guide scroll plates 7 and 8 rotate on a bushing 11a bolted between the front housing 1 and the guide housing 4. On the front housing 1 is an arcuate slot 12 slidably receiving a pivot pin 13 for one of two toggle links 14 and 15. The links have a common pivot 16 and the link has an extension 17 providing a handle. The pivot pin 13 has a threaded end 18 which extends through the slot 12 and has threaded thereon a clamping nut 19 provided with a handle 20. By loosening the nut 19, the pin 13 may be moved to any selected position along the slot 12 and positively locked in that position by tightening the nut which can be easily done by means of the handle 20. When the links 14 and 15 are aligned with each other and extend in opposite directions from the common pivot 16, a pin 20a cooperates with an ear 21 on the chaser scroll plate 7 and moves the chaser scroll plate in a clockwise direction as viewed in Fig. 2 thereby causing the chasers 3 to move radially outward to open the die for insertion or removal of pipe. When the handle 17 is turned 180 from the position shown so the links 14 and 15 extend in the same direction from the common pivot 16, the'chaser scroll plate is moved;

in a counterclockwise direction thereby causing the threading chasers 3 to move radially inward to close the die for threading. The scroll cam surfaces on the chaser 2,760,213 Patented Aug. 28, 1956 ICC and guide cam plates 7 and 8 are centered on the axis of the threader so that in any position of the cam plates, the chasers and guide members are centered on the axis of the threader. That is, rotation of the cam plates moves the chasers and guide members radially but does not change the concentricity. The parts so far described constitute a quick opening threader in which the user can select a plurality of pipe sizes by means of the nut 19 and can open and close the threading chaser by a movement of the handle 17. When the threading chasers are closed, they are in threading position. When the threading chasers are open, the threaded pipe can be easily and quickly removed from the die without backing the die ofi the threads. As is customary in such dies, the front housing 1 has socket members 22a for receiving handles by which the die may be turned for threading. The parts so far described are or may be of common construction.

In order that the guide member 6 may be moved radially inward and outward at the same time as the threading chasers 3, the chaser and guide scroll plates 7 and 8 have registering windows or openings 22 receiving coil springs 23. At one end of each opening 22, the chaser and guide scroll plates are provided with mating semicyclindrical projections 24 which act as a seat for one end of the spring 23. At the opposite end of each opening 22, the chaser and guide scroll plates have similar mating semi-cylindrical projections 25 which act as a seat for the opposite end of the spring 23. The spring 23, accordingly, provides the force transmitting connection between the chaser scroll plate 7 and the guide scroll plate 8. As the chaser scroll plate 7 is turned in a counterclockwise direction as viewed in Fig. 2, the force is transmitted from the projection 24 on the chaser scroll plate through the spring 23 to the projection 25 on the guide scroll plate thereby causing a similar movement of the guide scroll plate 8. While the chaser scroll plate 7 should move to a fixed position in the closed position of the die, the guide scroll plate 8 should only move to a position in which the guide members 6 tightly engage the outer surface of the pipe 26 as shown in Fig. 4. This is permitted by the yieldable connection provided by the spring 23. As soon as the guide members 6 contact the outer surface of the pipe 26, movement of the guide members 6 stops, but the continued movement of the chaser scroll plate 7 necessary to move the threading chasers 3 to the proper position continues. There, accordingly, is no need to have separate adjustments for the pipe. The guides open and close at the same time as the threading chasers. Furthermore, the guides are always concentric with the axis of the threader in tight engagement with the outside of the pipe being threaded. The projections 24 and 25 are long enough to remain within the spring 23 in all positions of the guide and scroll plates.

In Figs. 5 to 9, inclusive, is shown another quick opening threader which has the advantage that the guides may be disconnected from the mechanism for opening and closing the threading chasers so that the die may be used for cutting nipples where the portion of the nipples being threaded is of different diameter than the portion of the nipple engaging the guides.

In this threader there is a front housing 26 having radial guide slots 27 for threading chasers 28. At the back of the housing 26 is fixed a housing 29 having similar radial slots for guide members 30. The housings 26 and 29 are rigidly fixed together and comprise the frame of the threader. Journaled on the housing 29 is a chaser scroll plate 31 having scroll members 32 fitting in notches 33 in the threading chasers 28 so that as the chaser scroll plate 31 is rotated, the threading chasers 28 are moved radially outward or inward dependingupon the Y direction of rotation. Rotatable on the guide housing 29 is a guide scroll plate 34 having scroll grooves 35 receiving tangs 36 on the guide: members 30. As the guide scroll member 34 is rotated relative to. the guide housing. 29, the tangs. 36 cooperatewith the scroll slots 35. causing radial inward or outward movement of the guide members depending upon. direction. of the. rotation- At the outer part. of the. guide. scroll member 34: are sockets 37 receiving springs. 38 arranged between thev bottoms of the sockets and: screws 39 threadedv into washers 40 which overlap a bearing surface. 41 on: the guide housing 29. The springs 38 provide a controlled pressure between. the washers 40 and the surface. 41 so that the: guide scroll member tends to'remainin position.

For the purpose of adjusting the. threading chasers 28 so as to cut difierent sizepipe auction the further purpose of opening and closing the chasers so as: to permit the easy insertion or removal. of pipe, the same construction.

illustrated inFig. 2 is used.- In accordance: with this construction, the front housing 26- has aslot. 42' receiving. a

pivot pin 43 pivoted to one end of a link. 44. Threaded.

on the pivot pin 43 is a nut 45' provided with a handle 46 so that when the nut is loosened, the pivot pin may be moved along the slot 42 to selected. positions for threading different sizes of pipe. When the nut 45 is tightened the pivot pin is locked in the selected. position. The opposite end. of the link 44- is pivoted at. 47 to. a link 48 having an extension 49 providing a handle. The link. 48 has a projection 50 which fits in an car 51 on the chaser scroll plate 31. These parts are similar in con-- struction to those illustrated by reference numerals 1 2 through 21, inclusive, in Fig. 2 andneed not be further described here. In order to provide an operative connection between the chaser scroll. plate. 31 and the guide scroll plate 34, there is provided on the chaser scroll plate two ears 52 between which extend a pin 53 around. which is a coil spring 54 having one end 55 engaging the chaser scroll plate 31 and its other end 56. engaging. a catch 57 journaled on the pin 53 andv urging the catch into a notch 58 in the guide scroll member. 34. So long as the catch. 57 is in the notch 58,. the closing of the chaser scroll plate 31 causes a simultaneous closing of. the guide scroll member 34. When the guide members 30 come into contact with the outer surface of the pipe being threaded, rotation. of the guide scroll member 34. stops and the spring 54 permits the continued. rotation of the chaser scroll plate 31 necessary tobring the threading.

chasers 28 into the proper threading position. The. spring- 54 has the. same function as the spring 23 in maintaining, the guides 30 tightly against the outer surface of. the pipe. and in permitting the relative movement between the chaser and guide SCIOlll plates necessary if the guide scroll. member is to be operated by the. same linkage 43-51, inclusive, which operates the chaser scroll plate.

Under some conditions, for example, in the threading. of nipples, it is desirable that the guides 30 be independ-- ently adjustable. To achieve this, the catch 57 is moved out of the notch 58 thereby disconnecting. the guide scroll member 34 from the chlaser scroll plate 31. When this is done, the guides can be independently adjusted, for ex-- ample, to accommodate a larger diameter surface than that being threaded by threading chasers 28. It is very easy to manually move the catch 57 out of the notch 58 while the handle 49 is being, turned to close. the dies. It will be noted that there is an inclined section. 59' on each side of the notch 58 so that when the catch 57 is released, it is guided back into the notchas. the handle 49 is turned to rotate the chaser scroll plate 31. The washers 40 provide sufficient friction to hold the guide scroll member 34' in its adjusted position when the catch 57 is out of the notch 58.

In both pipe threaders, the guides are set tight against and concentric with the pipe being. threaded automatically as the die is closed. The tight fit of the guides is: not. affected by over or under size pipe and provides the arcan rate alignment necessary to produce straight threads. The tight fit of the guides permits a closer spacing of the guides and chasers thereby decreasing the overall length of the threader.

What is claimed as new is:

1. A quick opening threading die comprising a frame having a first set of angul'arly spaced radial guideways receiving thread cutting chasers and another set of angularly spaced. radial guideways axially spaced from the first set receiving guide members, a rotatable chaser cam plate having spirally directed cam surfaces cooperating with the chasers to move them radially upon rotation of the chaser plate. relative to' the frame, a rotatable guide cam plate having corresponding spirally directed cam surfaces cooperating with the guide members to move them radially upon rotation of the guide plate relative to the frame, manually controlled means for rotating the chaser plate relative to. the frame, and a resilient, force transmitting connection from. thechaser plate to the guide plate whereby in closing. the. guide plate stopsuponencountering resistance such as that due to contact. of the guide members with-a pipe being threaded. andthe chaser plate continues rotation to move. the thread. cutting chasers into the proper position for threading.

2:. A quick. opening threading die comprising a frame having a.v first. set of angularly spaced radial guideways receiving thread cutting chasers and. another set of. angularly spaced radial giudeways axially spaced from the first set receiving guide members, a rotatable chaser cam plate having spirally directed. cam surfaces cooperating. with the chasers to move them radially upon rotation of the chaser plate relative to the frame,. a rotatable guide cam plate having corresponding spirally directed cam surfaces cooperating with. the guide. members. to move them radially uponrotation of the guide plate relative to the frame, manually controlled means. for rotating the chaser plate: relative to the frame, opposed angularly spaced. spring seatsv on the chaser and guide plates, a coil spring extending between. said. seats and providing force transmitting connection from the chaser plate tothe guide platewhereby in closing the. guide plate stops upon encountering resistance such as that due to contact of the guide members Withv a; pipe being threaded and the chaser. plate.- continues rotation. to move the thread. cutting chasers into the proper position for threading- 3.. A quick opening threading die comprising a front housing having. angularly spaced radial slots. inits. back surface receiving. thread cutting. chasers, another housing fixed. to the. back. of the front housing and having angularl-y spaced. radial slots in its. back surface receiving guide members, a chaser plate journaled on said other housing andhavingspirally directed cam. surfacescooperating with the. chasersv to move them. radially upon rotation ofthe plate relative. to the housing, a guide plate likewise journaled on said other housing and having corresponding spirally directed cam surfacescooperating with the guide members to move them radially upon rotation of other plate relative to the housing, a flange on said guide plate extending, over said other housing and presented to the chaser plate, a catch. cooperating with said flange to compel movement of the guide plate with the catch, means resiliently mounting the catch on the chaser plate whereby the catch normlally moves. with the chaser plate but can move relative. to the. chaser plate whenever the guide plate encounters resistance such. asthat due to engagement of the. guide. members with the outer surface of a pipe being threaded and manual means for rotating thev chaser plate relative to the housing to open. and close the chaser and the guide members.

4. In a quick opening pipe threading die of the type. having. a rotatable chaser cam plate for moving a plurality of angularly spaced thread-1 cutting chasers; radially in. equal amounts so the chasers are always concentric with the axis of. the die, rotatable guide. can plate for a plurality of spaced. guide members:

radially in corresponding equal amounts so the guide members are always concentric with the axis of the die,-

and further having manual means fior rotating the chaser cam plate, the combination of a resilient force transmitting connection from the chaser plate to the guide plate whereby in closing the guide plate stops upon encountering resistance such as that clue to contact of the guide members with a pipe being threaded and the chaser plate continues rotation to move the thread cutting chasers into the proper position for threading.

5. In a quick opening pipe threading die of the type having a rotatable chaser cam plate for moving a plurality of angularly spaced thread cutting chasers radially in equal amounts so the chasers are always concentric with the axis of the die, rotatable guide cam plate for moving a plurality of angularly spaced guide members radially in corresponding equal amounts so the guide members are always concentric with the axis of the die, and further having manual means for rotating the chaser cam plate, the combination of a catch comprising interengaging parts on the chaser and guide cam plates connecting the plates for rotation together, and a resilient connection between one of the inter-engaging parts and its associated cam plate whereby rotation of the guide cam plate can stop whenever the guide cam plate encounters resistance such as that due to contact of the guide members with a pipe being threaded while the chaser cam plate continues its notation to move the thread cutting chasers into the proper position for threading.

6. In a quick opening pipe threading die of the type having a rotatable chaser cam plat-e for moving a plurality of angularly spaced thread cutting chasers radially in equal amounts so the chasers are always concentric with the axis of the die, rotatable guide ca-m plate for moving a plurality of angularly spaced guide members radially in corresponding equal amounts so the guide members are always concentric with the axis of the die, and further having manual means for rotating the chaser cam plate, the combination of a latch member on and movable relative to the chaser cam plate, a cooperating detent part on the guide cam plate, a stop on the chaser cam plate, resilient means on the chaser cam plate urging the latch member against the stop and into the cooperating detent part to connect the plates for rota tion together whereby rotation of the guide cam plate can stop whenever the guide cam plate encounters re sistance such as that due to contact of the guide members with a pipe being threaded while the chaser cam plate continues its rotation to move the thread cutting chasers into the proper position for threading.

7. The construction of claim 3 in which the mounting for the catch comprises a tangentially directed pin supported between two spaced abutments on the chaser cam plate and in which the catch is both slidable and notatable on the pin, and further includes a coil spring encircling the pin and arranged between one of the abutments and the catch and urging the catch against the other abutment, said spring having a part cooperating with the catch to urge it into the notch.

No references cited.

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