US1478065A - Pipe-cutting machine - Google Patents

Description

Dec. 18 1923; www5 A. T. SAMPSON PIPE CUTTING MACHINE Original Filed May 8. 1919 2 Sheets-Sheet 1 M @f @y BA'SfbS 2 Sheets-Sheet 2 A T SMPSON PIPE CUTTING MACHINE Original Filed May 8, 19

Dec.. 1s, 1923.

Patented Dec. 18, 1923.

- ,rats

ARCHIBALD T. SA-MPSGN, OF LYNN, MASSACHUSETTS, ASSIGNOR TO SAIVIPSON AXCESSl SYSTEM, INC., 0F LYNN, MASSACHUSETTS, A CORPORATION CF MASSACHUSETTS.

PIPE-CUTTING MACHINE.

Application filed May 8, 1919, Serial T 0 aZZ whom 'it may concern.:

Be it known that I, ARCHIBALD T. SAMP- soN, a citizen of the United States, and a resident of Lynn, Massachusetts (whose post-office address is No. 494 Union St., Lynn, Massachusetts), have invented an Improvement in Pipe-Cutting Machines, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing` like parts.

My present invention relates toV cutting apparatus, and more particularly to cutting apparatus for cutting slots or openings in a metal conduit or pipe.

In my inventions upon an improved novel system of electrical construction and installation, partly explained in my prior copending application, Serial No. 166,613,1iled May 7, 1917, one of the important features consists in a method of cutting partially through a metal conduit without injury to the elect-ric wires therein, and even when the conduit is already in place in a building. In my co-pending application, Serial No. 345,284, filed December 16, 1919, I have described and claimed improved cutting apparatus for carrying out a step in the method described and claimed in my application, Serial No. 166,813, above referred to.

The. cutting` apparatus herein described and claimed is intended particularly for use in carrying out a further step in my improvements of forming the slot in a conduit orv pipe for an outlet or tap, by partially cutting through the conduit or pipe. The cutting apparatus herein described and claimed is preferably used after the cutting apparatus described and claimed in my copending application, Serial No. 345,284 filed Dec. 16, 1919, has completed its operation, because a cleaner cut is made in this way, but the present invention and apparatus may be used to perform their functions at anytime, regardless of Whether or not the cutting apparatus described in the application above referred to has performed its function. VWhile the present apparatus has been designed particularly for use on conduits or pipes valready installed in a building or other structure, its use is not so limited, as it is equally capable. of use in cutting slots in conduits orpipes before the same are installed.

A feature of my present invention is the improved means for mounting the cutters,

whereby` the same are mounted parallel to each other at either side of the carrying means, and move together'as a unitary structure.

A still further feature, and one relating to the last named feature, is the provision of improved means for mounting the entire cutting and feeding means on the body of the apparatus, together with means associated with said cutting and feeding means for co-acting with the body of the apparatus to hold the. entire structure in operative position on the work.

Further important features, novel constructions, and arrangements of parts and advantages, will be hereinafter more fully pointed out and claimed.

In the accompanying drawings, illustrating a preferred embodiment of my invention:

Fig. 1 is a front elevation of the cutting apparatus, in position on a conduit or pipe;

Fig. 2 is a view of the upper portion of the cutting apparatus, with the cover plate removed to show the internal mechanism;

Fig. 3 is a sectional view on the line 3--3 of Fig. 2;

Fig. 4 is a detail showing the position occupied by the tool when in action;

Fig. 5 is a side elevation of the cutting apparatus, and

Fig. 6 is a` sectional side elevation of the cutting apparatus on the line 6 6 of Fig. 1.

Referring to the drawings, and more particularly to Figs. 1, 5, and 6, 10 designates a body member, having` the intermediate portion 11 thereof extending upwardly and provided at either side lwith clamping and bearing plates 12, these plateslZ being provided with grooves 13 which extend along Vtheir length, as designated in Figs. 5 and 6. The lower portion of the body member 10 has formed integral therewith a laterally extending portion 14, on either side of which, as viewed in Fig. 1, is an upwardly extending side plate 15, these plates 15 being rigidly attachedtjoftby thebo'lt and nut' 16v and 17'.'

Pivotally attached tonpper port-ions of the; .siflelplatesz .1.5 are. the ends. of the, arms 18 ot-thibellcranls levers19, the levers being tied together so as to move in unison by the rod 20 fastened to the ends'fof the arms 21 by the Iscrews 22.

At the junction` of thearms 18 and 21 of the ball. Crank, lever 19 .is rirotally` mounted. the-ldwer eiidfof a." body member 23' having an"`fi'1it'ermediate portion 24E extending up'- wardly" "and` provided ateither side with clamping and'bearing plates 25, these plates 25 being providedwith projections 8fwhich extendfalong their y lenvth, as designated in Figs'.`"5' and 6, and' cola'ct with the; grooves 13 in the platesn12. Pins 26, on the arms 21, engage with the plates 15 to limit thedownwardm'oveinent of' saidl arms 21. Thev construotio'jiist ,described constitutes 'a toggle` joint fdr` ysecurelylocking the members 25 and-112'togetherf. z

The, projectionsmS whenbrought into en,- gagement withi the grooves 13, and the arms 21 moyedfto their lowermostyposition, lock the'v body lmembersl 10 and A23. and associated parts, `to'gether, clearlyvshown in Figs. 5l

vandv 6;"V When inthe position shown in4 Figs. "5 and6, the` b"o,dy members are spaced apart andiparalflel toi` each other, as arerthe inter# mediate portions 11' and 24, thesevintermediateportions however, being spaced further apart than" the body members, fora purpose 'to hereinafter described.

The lateral portion or projection 14 is inT ternally,screw-threadedat 27, to 'receive the externally; threaded hollow shaft 2,8, the lpath"'of'travel of the shaft 28 being parallelA lto andequidistant from the body members 10 and 2,3. AA handle 429,rigidly attachedY to the lower' end of thel hollow shaft 28'enahles theoperatortofmove the hollow shaft up- Wardf 01?..d1eivnwardl.

Thebodymemberis provided with a guide way inv which slides a' projectionjon a iiangeI1 31, of anN internally threaded v4sleeve 32.' 'This sleeve 32 is a free'iit in' the exten.

,nallyl threaded -hollowshaft 28 and entends downwardly to a point beyond the lower end of saidL hollow `shaft, to provide room for a col1ar .33,`whichissheld on the sleeve 32 by thefpin A34`Ian`d limits the endwise movement ofthe shaft` 28. The upper ypart 35 only of i' the sleeve 32 isV threaded to. receive lthe on, I

threadedportion of the feed rod 36. The lowery portion 137. of the interior of the sleeve 32 forms a bearing for the feed rod 36l the intermediate portionA of the interior "of the sleeve32 being cut away, as shown in v Fig. 6,A to provide a clearancespace for-'the threaded .portion of the feed rodV when the same is lowered inthe sleeve 32..

The upper portionV 3,7 of the feed rod 36 is reduced in diameter, as shown in Fig. 6, to receive a crossfbar 38 of. a combined clamp and tool support'. filhis crossLbar 38 extends laterally of the intermediate portions 11 and 24C, as viewed in Fig. 1, and it is for the par-V pose of. allowing room for the. combined clamp and tool support that the space betweenV the intermediate portions 11 and is greater than the space between the body n'iembers 10 and The feed rod 36 is pro-. .a

vided with a handle by means of which it may be turned. e On the reduced portion 37 of the feed rod 36 and above the crossbar 38 is rigidly inonnted a gear 39 of any convenientdiameter and pitch'. The upperV face of the cross-bar 38` is provided. with holes a() and lil, of suitable., diameter and-.f

depth, parallel to andequidjistant from the holey for the feed. Vrod 36, to receive the lower ends ofv the auxiliary feed rods 42 and, 43.

stood that l' may `malte the thread of thev feed rod l36 left handed and the threads ,on the'auxiliary feed rods42and 13 right handed, without departing from the spirit of the invention,- the onlyrequisite being that the gear 39 thereon, meshing withthe gears all anda-5, will turn lthe threaded auxiliary rods 42 and 43 in such a ldirection as to move the cross-bar38 toward or from theV clamping member 4 6, which is Vprovided with longitni dinally Vthreaded holes fl?, 48, and 49, tore-A ceive the feed rods 36., 42 and t3 respectively. Cover Aplates 71 for the gears 39, ist andV and rods 3.7, 42 `and i3 are provided,- being held in position on the cross-bar 38 by screws.

'72. Theupper end of the clamping member 46 is provided kwith V-shaped grooves'() and 51, the extreme outer ends of VVwhich are provided with, outwardly and upwardly extending projections 52,V (as viewed in Fig. 6) which are adapted to co-operate with the clamping arms 12 and 25. On the `feed rod 36 beneath the crossfbar 38, is provided a nut 53 threaded onto Vthe rod 36 vand between the upper end of this nut and the lower face of the cross-bar is a coil spring 54 and the collar 55. which is preferably formed integral with the nut .53. The tension of the spring fhis adjusted 'by moving the nut 53 on theA feed rod 36, and thenut isk held in adjusted position by the screw 56, This construction allows the cutting mechanism on the` crossbar 38v to. be yieldingly held against the pipe being worked on, as there is ampie space or clearance between the'lower face of the cross-bar 38 and the top of the collar 55 when the spring is fully compressed, as is evident from an inspection of Fig. 6.

Centrally located on either end of the cross-bar 38 are laterally projecting studs 57 and 58, on which are pivotally mounted the cutter holders 59 and 60 respectively. The cutter holders are composed of plates 6l and 62, each being provided on their inner face with centrally located longitudinal grooves 63 in which is placed the cutter 64. Near the upper end of the plates 6l and 62 of the cutter holders are aligned perforations on either side of their longitudinal center, to receivethe reduced threaded ends of the rods and 66. Nuts 67 clampV the plates 6l and 62 firmly to the rods 65 and 66, this operation also clamping the cutter 64 in position in the grooves 63 in the plates. The portions of the clamping member 46 containing the V-shaped grooves 50 and 5l are perforated, as at 68, to allow the cutters 64 to be fed therethrough into engagement with the conduit or pipe to be worked on.

The distance between the parallelly arranged rods 65 and 66 is greater than the -thickness of the clamping member 46 at this point, being equal to the depth of the cutters 64, so that, as the cutter'bars 59 and 60 oscillate on the studs 57 and 58 respectively, the operative cutting edge of the cutter will be in line with the line joining the center of the pipe 69, being worked on, and the center of the studs 57 and 58, as clearly shown in Fig. 6. By this construction a straight parallelsided cutter 64 may be used with the assurance that there will always be proper clearance for the cutting edge, as clearly shown in Fig. 4. When the cutter requires sharpening, the top vend only of the cutter need be ground.

The operation of my invention is as follows:

The feed rod 36 is rotated to lower the upper face of the cutters 64 below the` V- shaped grooves 50 and 5l. The arm 2l is raised to unlock the toggle joint, and disengage the projection 8 from the groove i3. The clamping and bearing faces l2 are placed over the conduit or pipe to be operated on, the projection 8 dropped into the groove 13, andthe body members l0 and 23 and associated parts locked together by depressing tlie arm 2l. Handle 29 is now turned to rotate the hollow shaft 28, moving the feed rod 36 and all mechanism associated therewith upward until the V-shaped grooves 50 and 5l engage with the lower portion of the pipe 69. l assume that the cutting apparatus of the present invention is to be used after the longitudinal grooves or slots have been cut in the conduit or pipe by the `cutting apparatus described and claimed in my co-pending application Serial No. 345,284, filed Dec. 16, 1919. The apparatus of the present invention is therefore, moved along the conduit or pipe until in proper position` with relationto the longitudinal slots referred to, when the handle is operated to turn the feed screw 36 and i tion, and of any suitable length. As the cutting edge becomes dulled, the cutter may be sharpened by simply grinding the end thereof, and it may be thus sharpened indefinitely until the rod is too short to be acted on by the clamping bolts 65 and 66 and nuts 67. This type of tool and tool holder is extremely practical and economical, as it has been found that the cutter may be used until it is less than three quarters of an inch in len h.

'lhe drawings illustrate one embodiment of my invention, and it is to be understood that l may vary the size, shape, and arrangement Iof the elements shown without4 departing from the spirit of the invention. i/ilhile I have shown the apparatus embodying a plurality, i. e. a pair of cutting cutters, it will be appreciated that the invention, broadly considered, may be embodied with a single cutter or with a greater plurality of cutters than the pair herein shown. Furthermore, an important feature of this apparatus consists in the fact that the cutter oscillates from one cutting position to the reverse during the oscillation of the entire apparatus, consequently each cutter presents two cutting corners or edges and these cutting edges are automatically brought into cutting operation through the oscillation of the cutters,-this is on the pivots 57 and 58 during the normal operation of the entire apparatus through the swinging to and fro of the handle 70. This feature is most iinportant, greatly increasing the life of the cutters and insuring the quick cutting action automatically digging in each corner of the tool to increase the line of cut. A further important feature is the fact that the portions 52 constitute a guard or guide for the depth of cutting action of each cutter, these portions 52 contacting with the outer face of the pipe at different relative positions proportionately determined by the diameters of the pipe being acted upon. I believe this action to be a distinct novelty in this art and l wish to claim the same broadly.

An additional importa-nt feature of the machine is the automatic adjustment of each After the cutter and guard for different diameters of pipe, and with a large range-from one-half inch diameter' to an inch and al half diaineter, five sizes of pipe for which a singlev mae chine is capable of operating upon.

Having thus described my invention, what l claim and desire to secure by Letters; Patent, is

l. A machine of the class described adapted for forming spaced cuts, having a pair of pivotally mounted cutters provided with cutting edges at either side thereof, means /for oscillating said cutters on their pivot points to bring said cutting edgesalternately ifi into cutting position, and means for moving provic ed with cutting edges at either side. if? thereof, means for oscillating said cutters on their pivot points to bring said cutting edges alternately into cutting position, means to move said cutters into and out of engagement with the work, simultaneously,

30 andy means for yieldingly holding said cutters against the work.

3. A machine of the class described, comprisinga body having hinged members, means for locking the hinged members together to suspend the body on the conduit or pipe, a hollow shaft, movable longitudinally of the body, a feed screw mounted for rotation and longitudinal movement in said hollow shaft, a plurality of cutters mounted on said feed screw, auxiliary clamping or positioning means also mounted on said feed screw, and means for moving said hollow shaft longitudinally of the body to position the auxiliary clamping or positioning means and said cutters on the conduit or pipe. Y

4. A machine of the class described, inw cluding a body member and means associated therewith for positioning the machine on the work, a crossbar locatedsbelow and parallel to said associated means, oscillatory cutter holders pivotally mounted at their lower ends on either side of said cross-bar, and means near the upper end of the cutter holders for connecting the saine and limiting the oscillatory movement thereof.

5. A machine of the class described, including a body member and means associatedltherewith for positioning the machine on the work, a cross-bar located below and parallel to said `associated means, oscillatory cutter holders pivotally mounted at their lower ends on either side of said cross-bar, means near the upper end of the cutter' hold- 66 ers for connecting the same and limiting the faence,

oscillatory movement thereof, and perforations in said asseciatedn'ieans through therewith for positioning the machine onthel work, a cross-bar locatedi below an'diparallel t0 said associated means, oscillatory cutter holders pivotally mounted at their lower ends on either side of said crossfbar, means near the upper end of the cutter holders for connecting the same and limiting the oscillatory movement thereof, a plurality' of parallel threaded shafts rotatably mounted inV said cross-bar and engaging in threaded holes, in the said associated means, gears mounted on said threaded shafts and engaging with each other so that the shafts rotate at the same speed and simultaneously, and Ymeans for rotating one of said shafts.

7. A machine of the class described adapted for forming cuts simultaneously transversely of a cylindrical rod or pipe, including a cross-bar, a pair of cutters pivotally mounted, means for oscillatingsaid'cutters on their pivot. points, a threaded feedrod, a gear thereon, aA rotatable threaded rod parallel to and on either side of said feed; rod, gears on said parallelrods equal in diameter and pitch to the gear on the feed rod, where- ,Y0 Y ing a body member vand, means associated Y by the parallel rods are rotated at the same speed as the feed rod, a positioningbar into which said parallel rods and feed rod are threaded, and means for rotating'said feed rod whereby the cross-bar is moved parallel to and towards and away from the positioning bar.

8. A machine of the vclassfdescribed adapted for forming parallel cuts simultaneously transversely of a cylindrical rod or pipe, in,- cluding a cross-bar, a. pair of cutters pivot-- ally mounted, means for oscillating said cutters on their pivot points, a threaded feedy rod, a gear thereon, a rotatable Vrod parallel to and on either side of said feed rod, the threads lon said parallel rods being of the same pitch but of opposite direction to the thread on said feed rod, gears on .said parallel rods equal in diameter and pitch to the gear on the feed rod, whereby the parallel rods are rotated at the same speed as the feed rod, a positioning bar into which said parallel rods and feed rod are threaded, and means for rotating said. feed rod, whereby the cross-bar is moved parallel to and towardsV and away from the positioning bai. Y'

9. A machine of the class describedV for forming parallel cuts simultaneously transverselyk of a cylindrical rod 0r pipe, including a feed rod, a cross-bar thereon, cutters carried by said cross-bar, adjustable means on said feed rod, a spring on said feed rod below thecross-bar, and means on said Afeed rod for adjusting the tension of said spring. 10. il machine of the class described for forming parallel cuts simultaneously transversely of a cylindrical rod or pipe, comprising means for suspending the machine from the rod or pipe i co-acting therewith to hold the machine in Vposition on the rod or pipe, a plurality of y ter on the rod or pipe, and means for oscillating said cutter on its pivot to bring the cutting edges alternately into cutting position.

12. A machine of the class described, adapted for cutting a slot in a rod or pipe transversely of the length thereof, including a support, a two-edged cutter pivotally mounted thereon, means on the support for attaching the machine to the rod or pipe, and means for oscillating said cutter on its pivot to bring the cutting edges alternately into cutting position.

13.` A machine of the class described having a cutting member, clamping means t0 hold said member into cutting engagement with the working means, said clamping means cooperating with the cut-ting member to automatically cause alternate cutting portions of the cutting member to be presented to the work during the oscillation of the ap varatus.

14. machine of the class described, having a pivoted cutting member, clamping means to hold Said member into cutting engagement with the work, means providing for the oscillation of the cutting member and cooperating with a to and fro swinging movement of the machine whereby opposite cutting corners in said member are automatically brought into successive work cutting engagement during the oscillation of the apparatus.

15. In a machine of the class described,

cutting tool adapted to cut a groove in work during the oscillating movement. of the apparatus comprising a pivotal mounting for said cutting tool, means permitting predetermined independent oscillation of the cutting ,tool during oscillation of the apparatus and means to increase the depth of cut at will.

16. Pipe cutting apparatus of the kind position, means for described having a pivotally mounted cutter, i plurality of cutting edges on said cutter, and means to successively bring different cutting edges into work engaging position through oscillation of the apparatus, in combination with means to hold the aoparatus in worlr engaging position on the pipe.

17. Pipe cutting apparatus comprising a pivotally mounted cutting tool, and pipe engaging means to hold the apparatus into .vorlr engaging positionwith the pipe, including clamping devices to cooperate with the cutting tool and limit the depth of cut, in combination with adjustable cutter feeding means to increase the depth of cut of the cutter independently of the clamping members.

18. Pipe cutting apparatus having pipe engaging members, a cutting tool adapted to oscillate between said pipe engaging members and means to automatically bring successive edges into cutting position by the oscillation of the pipe cutting tool relatively with the Yengaging members during the operation of the apparatus.

19. Pipe cutting apparatus having pipe engaging members, a cutting tool adapted to oscillate between said pipe engaging members and means to automatically bring successive edges into cutting position by the oscillation of the pipe cutting tool relatively with the engaging members during the operation of the apparatus, in combination with means to `predetermine the extent of oscillation of said cutting tool relatively with the pipe engaging members.

20. A machine of the class described, adapted for completing the cutting of a slot in a cylindrical rod or pipe, including a plurality of pivotally mounted two-edged cutters, spaced apart for completing the slot .cutting action transversely of the length of the pipe, means for oscillating said apparatus relatively with the pipe to bring the cutters into action and means for simultaneously feeding forwardl7 the said plurality of cutters to increase the depth of out.

21. A. machine of the class described, adapted for cutting a. slot in a cylindrical rod or pipe, transversely of the lengt-h thereof, including cutting means adapted for eiiecting a cutting action in alternate directions during relative movement of said cutting means and the pipe.

22. A machineV of the class described, adapted for cutting a slot in a cylindrical rod or pipe, transversely of the length thereof, including a plurality of oscillating cutters adapted for effecting a cutting action in alternate directions during relative movement of said plurality of oscillating cutters and the pipe.

23. Pipe cutting apparatus having pipe engaging clamping members, a plurality of pivotally mounted cutting tools mounted lili for oscillation independentl of any movement imparted to the clamping members` and means automatically determined by the diameter of the pipe and by the action of the clamping members to position che plurality of cutting tools in operative anemem-l and engagement with the pipe.

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

ARCHIBALD T. SAMPS-ON. VVtnesSes: n

JAMES R. HOUDER, RAOHAEL L; CLARK.

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