US1546564A - Method of and means for cutting tubes - Google Patents

Description

July 2l, 1925.

J. A. CAMERON METHOD OF AND MEANS FOR CUTTING TUBES Filed Nov. ll, 1920 u if i n mung@ "1' L'" f--u-.' a

2 Sheets-Sheet l July 21, 1925.

J. A. CAMERON METHOD OF AND MEANS FOR CUTTING TUBES FiledNOv. l1, 1920 2 Sheets-Sheet 2 5140044450@ Jme Udine/om Patented July 21, 1925.v

` UNITED STATES l PATENT OFFICE.

'JAMES A. CAMERON, OF BROOKLYN, NEW YORK, ASSIGNOR TO CAMERON MACHINE COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

METHOD F AND MEANS FOR CUTTING TUBES.

` Application filed November useful Improvements in Methods of and Means for Cutting Tubes, of which the :tollowing is a specification.

This invention relates to tube cutting machines, and has for its main object and feature an improvement whereby it will notbe necessary to change the size of the mandrel for differentsizes of tubes. It is the present l practice in the art of tube cutting to use a mandrel or core for mounting the tube when cutting same into arbitrary lengths, which core lits the inside diameter of the tube, there being a separate mandrel for each diameter of tube, and this core has heretofore been made of a soft metal, usually brass or bronze, and the action of the cutters has been to score circumferential rings or depressions in its soft surface, with the cut is depressed into these rings and made rough and the inside diameter of the tube at this, point is therefore slightly smaller than at any other point, and this is a decided disadvantage.

In the accompanying drawings the invention is disclosed in a concrete and preferred form in whichp Fig. 1 is a front elevation, partly broken away and in section, of a machine embodying the invention:

Fig. 2 is a fragmentary end elevation, partly of arrow 2 of Fig. 1:

Fig; 3 is a vertical sectional view on the plane of line 3 -3 of Fig. 1: p

Fig. 4 is a top plan view ofone end of the machine:

Fig. 5 is a more or less diagrammatic end view of the upper part of the machine.

1 indicates afrotatable mandrel consisting preferably of an inner core and outer hardened sleeves capable otv resisting cutting action of score cutters 3 so that the latter This mandrel is supported at one. end in bearing 4: capable of sustaining the weight of the mandrel. 5 indicates a second bearing pivotally supported at 6 and capable of r being swung out ofthe way as indicated in result that the severed edge of the tube sov in section, looking in the direction' will not cut circumferential grooves therein.

11,1920. Serial No. 423,273.

' dotted lines in Fig. 1, so that a tube may be readily introducedon the mandrel. Outward movement of bearing 5 is limited by stop 7, and Sindicates a latch pivotally supported at 9 on the framework and adapted to have its end l() pass behind roller 11 so vas to retain said bearing in endwise engagement with the mandrel. 12are two upright standards supported by adjustable nuts 13 in sleeve 14 bolted to the framework. Pivotally supported 011 these standards is a rocking supporting member 15 that extends parallel with the mandrel. Carried by said support-ing member is a rail 16 also parallel with the mandrel, said rail having a rounded top, as shown, to pivotally support cutter holders 17. To space the cutter holders properly, endwisev ides 18 .are provided, said guides being a justably secured to rail v16. Cutters 3 of the `character known as score cutters are rotatably mounted on the cutter holders. Carried by .rocking member 15 are two rearward extensions 19 to whichv is adjustably secured an abutment member 20 that extends parallel to the rail and mandrel. Springs 21 are interposed between the ends of the cutter holders and the abutment member. The tension of the spring of each cutter holder may be individually adjusted by meansy of screw 22 or otherwise. 23 is a foot pedal supported at 24 and connected by means of rod 25 and arm 26 with Arocking member 15. 27 and 28 indicate fast and loose pulleys on the mandrel.`

Normally, gravity will movethe cutter parts into thev position shown in Fig. 3, but when the pedal is depressed, member 15 will rock on its pivotal support thereby causing Vthe cutters to engage a tubeon the mandrel and thereafter causing a turning movement of the cutter holders on the curved surface of the rail 16. This causes the tension of springs 21 to be increased so that each cutteris held against the .mandrel with indi- 1 vidual spring pressure.

Pressing the cutters into engagement with the tubewill cause the latter to be pressed against the rotating mandrel and due V'tothis fact the tube will follow the rotation of said mandrel and the paper or other material of which'` the tube is made will be severed.

Heretofore it has been customary to have the tube fit the mandrel snugly and to insert a mandrel of proper diameter when during the cuttingaction.

cutting different diameters of tubes. With the arrangement shown this is unnecessary because if a tube of larger diameter than that of the mandrel -is introduced on the mandrel, the cutters will press a part of the inside periphery of the tube against said mandrel and Will properly support the tube To insert a tube on the mandrel or to remove the severed rings, bearing 5 is movedinto the dotted line position shown in Fig. l'.

I claim:

l. A tube cutting machine comprising: as

at the point of cutting and to effect the cutting operation, and means for rotating the mandrel at will.

2. A tube cutting machine comprising: a rotatable mandrel to loosely receive a tube, and score cutters engaging the outside of the tube to effect rotation of the tube on the mandrel and cutting thereof by pressing a part of its inside periphery against the mandrel.

3. A tube cutting machine comprising: a rotatable mandrel to loosely receive a tube, and score cutting means to engage the outside of the tube to effect rotation of the-tube on. the mandrel and cutting thereof by pressing a part of its inside periphery against the mandrel. v

4f. A tube cutting machine comprising: a rotatable mandrel, bearings for said mandrel admitting of endwise introduction of a tube on the mandrel while the latter is supported by one of said bearings, a rocking support, a plurality of cutter holders pivotally supported on the rocking support, rotatable cutters in said cutter holders, means for actuating the rocking support, and individually adjustable spring means for placing the cutters under increasing tension by continued movement of the rocking support after the cutters engage the tube.

5. A tube cutting machine comprising: a rotatable mandrel, a bearing at one end of said mandrel capable of sustaining it even when unsupported at its other end, a bearing at the other end of the mandrel to additionally support the same during rotation thereof, means for rocking said second bearing endwise of the shaft to admit of introduction of a tube on the mandrel While the latter is supported by the first bearing, and cutters to coact With the mandrel to cut the tube thereon.

6. The method of cutting a tube into sections Which consists in mounting the tube loosely on a rotatable mandrel, and then pressing part of its inside periphery against thle3 mandrel to thereby rotate and cut the tu e.

7. Themethod of cutting a tube into sections Which consists in mounting the tube loosely on a rotatable mandrel, and then pressing part of its inside periphery against the mandrel, While the mandrel rotates, to thereby rotate the tube on the mandrel and cut it.

Signed at the Borough of Brooklyn 1n the county of Kings, city and State of ew York, this 9th day of November, 1920.

JAMES A. CAMERON.

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