US1305808A - Expander - Google Patents

Description

F. E. KEY.

EXPANDER.

APPLICATION FILED MAR 22, 1911.

Patented June 3, 1919.

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F. E. KEY.

EXPANDER.

APPLICATION HLED MAR. 22. I917.

' 1,305,808, Patented June 3, 1919.

2 SHEETSSHEET 2.

.rrnn sinus FREDERICK E. KEY, OF $1. LOUIS, MISSOURI.

EXPANDER.

Specification of Letters Patent. Patentd June 3, 1919.

Application filed March 22, 1917. Serial No. 156,620.

To all whom it may concern:

Be it known that I, FREDERICK E. KEY, a citizen of the United States of America, a resident of the city of St. Louis, State of Missouri, have invented certain new and useful Improvements in Expanders, of which the following is a full, clear, and ex act description, reference being had to the accompanying drawings, forming a part of this specification.

' My invention relates to an expander adapted for use in expanding tubes, flues, plugs, and other tubular articles.

. One of the objects of my invention is to produce an expander in which the pressure members may be first gradually forcedoutwardly to obtain the desired maximum outward pressure, and then rotated or rolled on the inner face of the expansible article to exert this pressure uniformly at all points throughout a continuous circular path. The expanded portion of the article is thus uniformly and firmly seated by a uniform instead of a constantly increasing pressure. The preferred form of the invention comprises a tapered pin arranged between and fitted to the pressure rolls, a feed screw for advancing the tapered pin to force the rolls outwardly, and means for releasing the feed screw after the desired pressure is obtained, so as to allow the tapered pin to rotate the rolls without forcing them outwardly.

With the foregoing and other objects in View the invention comprises the novel construction, combination and arrangement of parts hereinafter more specifically described and illustrated in theaccompanying drawings wherein is shown the preferred embodiment of the invention; however, it

is to be understood that the invention comprehends changes, variations and modifications which come within the scope of the claims hereunto appended.

Figure I is a plan view of an expander constructed in accordance with my invention. 7 t

Fig. II is a fragmentary view showing the power transmission device as it appears when the feed screw is released'from the operating memberQ V Fig. III is a longitudinal section showing the expander applied to a boiler plug.

Fig. IV is a section on line IVIV, Fig. III.

A designates a spreader pin having a tapered end portion 1 which lies between and engages tapered pressure rolls 2.' The spreaderpinis also provided with an operating member 3 having openings for the reception of an operating rod, and also having a non-circular portion 3 adapted to receive a wrench; The pressure rolls are rotatably mounted in a cage B, the latter being rotatably fitted to a'thrust member 0 having an annular groove 4 for the reception of a pin 5 which projects from the thrust member. An anti-friction ring 6 is arranged between the thrust member and a flange on the cage B; The pressure rolls 2 are retained in the'cage B by projections 7 (Fig. IV) at the outer face of the cage, and by a retaining ring 8 which lies within the cage.

To illustratethe operation of the expander, I have shown a boiler plug D having'a tubular flange 9 adapted to be expanded to firmly engage the tapered wall of an opening in a sheet metal member 10. This member 10 may be considered as a portion of the water leg of a boiler. The object is to expand a portion of the tubular flange 9'so as to firmly seat it on the tapered face of the opening in the member 10. The spreader pin A may be rotated and advanced between the pressure rolls 2 with the result of forc ing said rolls outwardly, at the same. time rolling them on the inner face of the flange 9.. During this operation the thrust member (l is seated on the member 10 and the cage B is slowly rotated by the motion transmitted through the pressure rolls 2.

The means for feeding or advancing the spreader pin A comprises an externally threaded tube 11 screwed into the cage B and firmly seated. on an abutment ring 12, which lies between the sleeve 11 and the retaining memberv S; An internally threaded sleeve, or nut, 13 fitted to the tube 11 has an inturned flange 1d (Fig. III) which lies adjacent to a collar 15 formed integral with the spreader pin A, an anti-friction ring 16 being interposed between the collar 15 and the flange 14. The means for transmitting movement from the operating member 3 to the threaded sleeve 13 comprises a collar 17 secured to the operatingimember 3 by means of a pin 18. A power transmission pin 19, slidably mounted in the collar 17, may be forced into a notch 20 in the end face of the threaded sleeve 13, by means of a spring 21. The power transmission pin 19 may be disengaged from the sleeve 13 by manipulating an operating rod 22, which extends from said pin 19, and the latter may be retained in its inoperative position by arranging the pin 22 in one of the recesses 24-, as shown in Fig. II. When the power transmission pin 19 is located in the notch 20, motion may be transmitted from the operating member 8 through said pin 19 to the threaded sleeve 13, thereby causing the spreader pm A to advance longitudinally when it is rotated by a wrench or other suitable device applied to the operating member 3. When-the power transmission pin 19 is latched in the inoperative position shown 111 Fig. II it cannot transmit movement to the threaded sleeve 13, and the spreader pm may then be rotated without advancing be tween the pressure rolls '2.

At the beginning of an expanding operation, the threaded sleeve 13 may be turned quickly by hand for the purpose of advancing the spreader pin to force the pressure rolls 2outwardl and into engagement with the flange 9. T e spreader pin is then forcibly rotated by means of a wrench or other suitable tool applied to the operating mem her 3. The transmission pin 19 being located in the notch 20, the spreader pin will advance with the threaded sleeve 13, thereby spreading the pressure rolls 3, at the same time rotating them on the inner face of the expansible flange 9. This action gradually expands the flange 9, and when the desired maximum pressure is transmitted through the rolls 2 the expanding operation should bestopped to avoid undue pressure, but the rolls 2 should be permitted to transmit this a maximum pressure uniformly at all points throughout their circular path. To accomplish this, the power transmission pin 19 is disengaged from the threaded sleeve 13 and latched in the inoperative position shown in Fig. II. The spreader pin A is then rotated to impart a rotary movement to the pressure rolls 2 without moving them away from each other. The expanded portion of the flange 9 is thus smoothed and firmly forced onto its tapered seat.

The expander I have shown may also be used in forming the tapered seats to which the boiler plugs D are applied. lVhen used for this purpose, the abutment ring 12 is removed from the cage B and the feed screw 11 is forced against the retaining member 8 which lies adjacent to the rolls 2. This enables the relatively large part of the tapered member 1 to engage the pressure rolls. The thrust member G is then applied to the wall 10 so as to locate the pressure rolls in the opening to be finished. The spreader pin and sleeve 13 are rotated simultaneously until said sleeve 13 engages the cage B. The desired expansion is then obtained and the tapered seat may be uniformly finished by releasing the transmission pin 19 and turning the spreader pin about three revolutions. It will be observed that seats of standard size and shape may be readily made in this manner, and since all of the boiler plugs D are made alike they will all fit the standard seats.

The pressure rolls 2 are preferably so arranged that their axes will lie at a slight angle to the center line of the expander, as shown in Fig. I.

Iclaim: V

1. In an expander, rotatable pressure rolls arranged to engage the inner face of the article to be expanded, a rotatable spreader pin having a tapered portion which lies between and engages said pressure rolls, a feeder including an externally threaded tube surrounding said spreader pin, an internally threaded sleeve fitted to said externally threaded tube, said internally threaded sleeve having an inturned flange at its outer end, a collar formed on said spreader pin and located within said internally threaded sleeve at a point adjacent to said inturned flange, a power transmission collar fixed to said spreader pin and located adjacent to said inturned flange, a spring pressed power transmission pin slidably mounted in said power transmission collar and arranged parallel with the axis of the spreader pin, said inturned flange having a notch for the re cention of the slidable power transmission pin, the latter being movable in a direction parallel with said axis of the spreader pin so as to move into and out of said notch, and a latch device for retaining said power transmission pin in an inoperative position to allow the spreader pin to turn the pressure rolls without forcing them away from each other.

2. In an expander, rotatable pressure rolls adapted to engage the inner face of the article to be expanded, a cage in which the pressure rolls are mounted, a rotatable spreader pin having a tapered portion which lies between and engages said pressure rolls, a feeder for advancing said spreader pm, said feeder including a rotary feed screw secured to said spreader pin so as to rotate and advance said pin, a relatively stationary screw threaded tube to which said rotary screw feed is fitted, and means for securing said screw threaded tube to. said cage, said screw threaded tube being adjustable to cocupy two different predetermined positions relative to said cage, and a stop device cooperating with said screw threaded tube to predetermine the distance between said two different positions. 7

3. In an expander, rotatable pressure rolls adapted to engage the inner face of the article to be expanded, a cage in which the pressure rolls are mounted, a rotatable a feeder for advancing said spreader pin, said feeder including a rotary feed screw secured to said spreader pin so as to rotate and advance said pin, a relatively stationary screw threaded tube to which said rotary feed screw is fitted, said relatively stationary tube being screwed into said cage, and

an abutment member arranged in said cage to limit the lnward movement of said relatively stationary screw threaded tube, said 10 abutment member being removable from the cage so as to allow said relatively stationary tube to be advanced in the cage and thereby adjusted toward said pressure rolls.

In testimony that I claim the foregoing I 15 hereunto aflix my signature.

FREDERICK E. KEY.

Copies of this patent may be obtained'for five cents each, by addressing the Commissioner of Patents, Washington, I). G.

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