US707292A - Tube-expander. - Google Patents

Description

Patented Aug. l9, I902.

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UNITED STATES PATENT OFFICE.

HENRY MIKEL BARR, OF WADSWORTH, NEVADA.

TUBE-EXPANDER.

SPECIFICATION forming part of Letters Patent No. 707,292, dated August 19, 1902.

Application filed March 27,1902.

To all whom it may concern:

Be it known that I, HENRY MIKEL BARR, a citizen of the United States, residing at Wadsworth, county of Washoe, State of Nevada, have invented an Improvement in Tube-Expanders; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to improvements in devices for expanding the ends of dues in boiler-sheets. Its object is to provide a rolling-tool which will be simple in construction and which will automatically release itself from the tube after spreading the latter, thereby enabling the operator to roll all fines exactly alike. v

It consists of a casing embracing revoluble rollers, a mandrel or spreader, a sleeve having a left-hand screw-thread turnablein the casing and against which the mandrel is adapted to abut as it is driven home, and a gage-plate disposed in relation to the sleeve.

It also comprises details which will be more fully set forth hereinafter, having reference to the accompanying drawings, in which- Figure 1 is an exterior View of my invention. Fig. 2 is a longitudinal section of the casing. Fig. 3 is a transverse section on the line a; 00, Fig. 2. Fig. 4 is a view of the mandrel with the sleeve in section.

A represents a suitable casing carrying at its forward end the usual rollers 2 and operated by a tapered mandrel or spreader 3. A sleeve 4, having a left-handed thread, screws into the rear end of the casing, and the distance which the head of the sleeveis desired to project beyond the casing may be determined by means of a slidable gage-plate 5. The sleeve is provided with a left-hand thread for the reason that it is customary to turn the mandrel to the right as itis advanced. The

head of the sleeve has a central polygonal recess 6, into which a like-shaped projection 7 on the mandrel is-adapted to fit when the mandrelis inserted into the sleeve. The end of the mandrel is made polygonal in crosssection either to receive a wrenchor the socket of a pneumatic tool.

In operation the roller endof the tool is placed in the end of a tube the desired distance. The mandrel is inserted into the sleeve and casing and power applied to drive Serial No. 100,181; (No model.)

in and rotate the mandrel. Having determined at what distance the mandrel'must be driven in to spread one of any given set of tubes properly, the gageo and sleeve 4 are set accordingly, so that as the mandrel advances and the projection 7 engages the recess 6 the sleeve will be turned to automatically retract the mandrel. When the mandrel is released by the action of the sleeve, the tool can be removed by hand. Heretofore it has been necessary to use a hammer to loosen the mandrel after spreading aflue. Thus not only is a considerable saving of time effected, but all tubes may be expanded uniformly, Whereas with the ordinary rolling-tool it has been entirely a matter of judgment of the operator when to stop rolling any particulartube.

In the operation .of these tools the mandrel is alternately struck by a hammer or like implement and turned by a wrench or other suitable means. The blows serve to advance the mandrel step-by step to spread the roll-- ers, and the turning is for the purpose of rolling the tube evenly. It is not to be understood that the part 7 of the mandrel would engage the socket 6 by merely turning the mandrel. The mandrel is advanced, say, onefourth of an inch at a blow, and is then turned. It is given another tap and turned again, and so on until the part 7 comes up to the socket. Sufficient care is taken to bring the sides of the shoulder. and socket into line, and the next blow drives the mandrel in sufficiently, so that the next time the latter is turned to operate the rollers it will also turn the sleeve 4 and gradually Withdraw the mandrel. In actual practice the corners of theshoulder of the part 7 are slightly rounded, and the edges of socket are beveled outwardly to insure the shoulder entering easily.

Having thus described. my invention, what I claim, and desire to secure by Letters Patent, is v l. The combination ina flue-expander, of a casing, a tubular series of rods, a mandrel, and means in connection with saidcasing by which the mandrel may be automatically retracted.

2. The combination in a flue-expander, of a casing, a tubular series of rods, 2. mandrel, means by which the inward movement of said mandrel may be limited and means by which said mandrel may be retracted automatically.

3. The combination in a flue-expander, of a casing, revoluble rods carried thereby, a spreader, stop means upon the casing by which the inward movement of the spreader is limited and means by which the spreader is retracted automatically on engaging said stop.

4. The combination in a flue-expander, of a casin g, rollers carried thereby, a left-threaded sleeve concentric with said casing and a mandrel adapted to be inserted through said sleeve and easing.

5. The combination in a flue-expander, of a casing, rollers thereon, a sleeve provided with left threads and turnable in said casing and concentric therewith, and a mandrel adapted to be inserted in said sleeve and casing to spread the rollers.

6. The combination in a flue-expander, of a casing, rollers thereon, a sleeve threaded and turnable in said casing, a mandrel, and engaging stop, means upon the mandrel and sleeve whereby the mandrel is retracted as it is turned in opposition to the threads on the sleeve.

7. The combination in a tube-expander, of a casing, rollers thereon, a mandrel, aleftthreaded sleeve in said casing and turnable in opposition to the mandrel, and an adjustable gage-plate in relation to said sleeve.

8. The combination in a tube-expander, of a casing, rollers thereon, a mandrel, a sleeve having a left-hand thread and in which said mandrel is slidable, a recess in the head of said sleeve, a projection on the mandrel adapted to engage said recess to turn the sleeve and retract the mandrel, and a gageplate slidable upon the casing and engaging the sleeve.

In witness whereof I have hereunto set my hand.

HENRY l\IIIKEL BARR.

\Vitnesses:

WILLIAM N. STARK, J NO. L. FORD.

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