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Publication numberUS531662 A
Publication typeGrant
Publication dateJan 1, 1895
Publication numberUS 531662 A, US 531662A, US-A-531662, US531662 A, US531662A
InventorsCarl Otto Thieme
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Device for cutting boiler-tubes
US 531662 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

a (No Model.)


Patented Jan. 1, 1895.




SPECIFIGQTION forming part of Letters PatentNOQ 531 ,662, dated January 1, 1895. Application filed October 1, 1894:. Seria1N0-524,582- (No model.)

To aZZ whom it may concern:

Be it known that I, CARL OrroTmEME, of the city of St.Louis,State of Missouri, have invented certain new and useful Improvements in Devices for Cutting B oiler-Tubes, of which the following is a full, clear, and exact description, reference being had-to the ac companyingdrawings,fo'rminga part hereof. My invention has relation to improvements in devices for cutting boiler tubes and coni sists 1n the novel arrangement and combinadetached View of a second form ofcutterf Fig. 7 is a middle vertical section of the rocker as hereinafter explained. Fig. Sis a section on line 0 c of Fig. 7; and Fig. 9 is an enlarged side view of the inner end of the sleeve surrounding the main shaft of my device.

The object of my invention is to materially simplify the construction set forth and described in Letters Patent No. 512,631, granted me under date of January 9, 1891, andrto this end I have devised a boiler tube cutter which inner reduced stem 6 of the shaft 3 is'passed I a cone 7, the narrow end of theicone resting against the inner end of the shaft 3, the cone being held on the stem by the terminal out 8. The outer surface of the cone is provided with a series of converging peripheral dovetail guides 9 and guide-Ways 10, the purpose of, which will hereinafter be explained.

Surrounding the shaft 3 is a sleeve 11, the inner end of which is provided with an enlarged portion or hollow head 12 whose inner walls are conical for the accommodation of l the cone 7. About the sleeve 11 is free to move a rotatable conical exteriorly-screwthreaded casting 13 whose inner reduced end is limited by the circular shoulder 14 formed atthe base of the portion 12. I

Theouteriperipheral edge of the casting is provided with a series of depressions or notches 15 for the engagement of the ends of the rocker 16 hereinafter. to be described. i

Mounted'loosely on the sleeve 11 exterior j 'and'adjacent to the casting'13 is a forked handle 17. Between the forks 18 of thehandle and fixed to the sleeve 11 is a ratchet wheel 19 engaged by the pawl 20pivoted by a bolt 21 between the forks.

Mounted on the side of the handle on the fork adjacent to the casting 13 is a rocker 16 having engaging ends 22.

bolt 23. This end of the boltis provided with two adjacent fiat surfaces24 making an obtuse angle with each other. Within the rocker is a longitudinal cavity or socket 25 in which is inserted a pin 26 Whose head is adapted to contact with either of the surfaces 24, the said pin pressing against the surfaces 24 by the action of the encircling spring 27 confined betweenthe bottom of the cavity 25 and the head of the pin. Before the rocker is mounted on cavity through. the opening 28in the rocker, and when the parts are adjusted the rocker is passed over the bolt and secured as best shown in Figs. 1 and 3. It. is obvious that if the rocker be tilted in the position as shown in Fig. 3, one of the surfaces 21 will come in contact with the head of the pin 26, the encircling spring 27 keeping it in that position-a position by which one of the engaging ends 22 is enabled to engage with the depressions 15 of the'rotatable casting 13, and thus upon rotation of the handle 17 turn the casting 13 in one direction and screw the same firmly into the end of the tube 2 (it being understood that the rocker will engage the depressions 15 and turn the casting 13 as the handle 17 is oper ated in one direction, and slide past the depressions upon the return stroke of the handie). When the rocker is tilted in the oppo site direction so as to bring the second sur- The rocker swings or depends from the smooth end of a securing the bolt 23 the'pin 26 is first passed into its face 24 in contact with the head of the pin 26,

K the opposite engaging end 22 of the rocker will engage the depressions 15, and by a reverse operation of the handle 17 unscrew the casting 13 from out of the tube 2.

The opposite guides 9 receive the cutters 30, the bases of which have corresponding dovetail openings 31 to pass over the guides, and the guide-ways 10 receive the cutters 32 whose bases have dovetail projections 33 to enter said guides. This arrangement makes the most perfect and durable form of cutting device. The outer ends of the cutters pass through cut-away portions 3% formed along the innerperiphery of the enlarged portion 12, the end of this portion being interiorly screwthreaded as at 35, and into this is screwed the casing 36, the distance to which it is screwed being limited by the shoulder 37 at the base of the screw-threaded portion 35. The casing is screwed by the aid of the polygonal nut or head 38. \Vhen the casing 36 isdriven home .the screw-threaded end thereof just reaches to the cutters, and thus guides the latter as they pass through the openings 31, preventing lateral binding.

The operation is as follows: After the parts are assembled as indicated,'the casting 13 is driven into the tube 2 as already indicated (it being understood of course that during the rotation of the casting the pawl 20 is disengaged from the ratchet 19). Then, upon the turning of the hand disk 4 in the proper direction the shaft 3 with its cone 7 will be drawn outwardly, the guides 9 and guideways 10 forcing outwardly, that is, expanding the cutters against the inner wall of the tube 2. The rocker 16 is then disengaged or tripped so as to slide by the depressions 15, the pawl 20 is thrown into engagement with the ratchet 19, the handle 17 is then operated in proper direction to turn the ratchet, which in turn imparts a rotary motion to the sleeve 11, this operating the cutters at the inner end thereof. The said cutters are kept in contact with theinner wall of the tube 2 by operating the hand disk 4 in proper direction, it being remembered that this disk moves the shaft 3 which expands the cutters when moved outwardly. The casing 36 thoroughly protects the inner parts of the device, and at the same time its end where it meets the enlarged portion 12 serves asa guide for the cutters 30 and 32.

Having described my invention, what I claim is- 1. In a tube cutter, a suitable screwthreaded shaft, a cone at the inner end thereof, a sleeve embracing said shaft, cut-a-way portions at the inner end of said sleeve, acasing detachably secured to the inner enlarged end of the sleeve, suitable guides and guide-ways on the periphery of the cone, cutters passing through the cut-a-way portions, means for retating the sleeve and expanding the cutters, substantially as set forth.

2. In a tube cutter, a suitable shaft, asleeve surrounding the same, a rotatable exteriorly screw-threaded casting passed over said sleeve, an operating handle embracing said sleeve, a series of peripheral depressions along the outer edge of the casting, a rocker pivoted to the handle, and means for giving a predetermined inclination to the rocker, substantially as set forth.

3. In a tube cutter, a suitable sleeve, a retatable casting surrounding the same, a ban-- die embracing the sleeve, a rocker pivoted to the side of the handle, a retaining bolt for said rocker having a smooth end and flat sui faces contiguousto one another and at a suitable angle with each other, a cavity in said rocker, a pin in said cavity having a head cooperating with the flat surfaces of the bolt, and an encircling spring for said pin to keep the same in contact against either of the flat surfaces of the retaining bolt, substantially as set forth.

t. In a tube cutter, a suitable shaft, a sleeve embracing the same, an enlarged inner end on said sleeve, suitable cut-a-way portions at the end of the enlarged portion of the sleeve, said enlarged end being interiorly screwthreaded and having a limiting shoulder or ridge at the base of the screw-threaded portion, and a casing adapted 'to screw into the enlarged end of the sleeve and limited by the said shoulder, a series of cutters at the inner end of the shaft, said cutters passing through the cutaway openings and being guided by the end of the casing, substantially as set forth.

5. In a tube cutter, a suitable screwthreaded shaft, a cone at the inner end thereof, a sleeve embracing said shaft, cnt-a-way portions at the inner end of the sleeve, a casing detachably secured to the inner enlarged end of the sleeve, suitable dove-tail guides and guide-ways on the periphery of the cone, eutters passing through the cut-a-way portions, and means for rotating the sleeve and expandin g the cutters, substantially as set forth.

In testimony whereof Iaffix my signature in the presence of two witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2731718 *Jun 4, 1954Jan 24, 1956Goss Harry EInside pipe cutter
US4841636 *Aug 31, 1987Jun 27, 1989Westinghouse Electric Corp.Positive drive mechanism for uniform feed of internal tube cutter
US5685078 *Mar 28, 1996Nov 11, 1997Dean Gray EnterprisesInternal pipe cutter
DE29620538U1 *Nov 26, 1996Jun 26, 1997Baldauf AndreasModelle von Fußballstadien
Cooperative ClassificationB23D21/145