US1921810A - Boiler plug expander - Google Patents

Description

Aug. 8, 1933. E. DucHEsNE 1,921,810

' BOILER PLUG EXPANDER Filed Dec. 12, 1931 INVENTOR .'E/nes TDuchesnei l' l i n ORNEY Patented Aug. 8, 1933 UNITED STATES PATENT OFFICE 'e 'Ihe present invention relates to tools, and particularly to' an improved tool or device for expanding hollow plugs in openings formed 1in boiler shells and like apparatus. 1

Due to the limited amount of space available within such plugs,it has been necessary to employ roller pins with much greater tapers than those applied to expanders under ordinary conditions. Such -tapers of the pins necessarily require the rollers of the expander device to be correspondingly tapered. In the useof such devices, however, much diflicultyhas been experienced in 4properly feeding the pin so as to complete the expansion operation with a minimum amount of rolling, in order to prevent undesirable iiaking of the metal inside of theplug.

The object of the present invention is to provide a ydevice of the character aforedescribed, wherein a novel pin and feed arrangementl is employed, which will eiectively expand the plug `with the maximum rapidity, that is to say, with a minimum amount `of rolling, practically eliminating undesirable aking.

' The invention is illustrated in the accompanying drawing, wherein, Figure 1 is a longitudinal `central sectional view of an expander device embodying the present invention, shown applied to a plugv fitted into an opening in a portion fof a boiler; Fig. 2 is a side View,l on an-enlarged scale, vof the housing part of thedevice; Fig. 3 isv a transverse;` sectional view Vtaken on Athel line III-III of Figs-2; Fig. 4 is an, enlarged side elevation of the roller pin of the device;` Fig. 5 is an enlarged transverse `sectional view, taken D on the line V-V of Fig. 4; and Fig. 6 isan enlarged side elevation of one of the rollers of th device.

Referring in detailto the drawing, a part ofV and is shaped to provide c'am surfaces 9, l0 and` 11 so that each third of its circumference will have a .005 cam effect against its respective roller, hereinafter to be described. The rearrend 12 of thepin is squared, to engagea motor` or other driving member (not shown) of any of the well known designs for rotating the pin.

Vopening'the rollersrmay jbe inserted or removed 'for assembly or repair of the device.

lhousing provides a ledge 24, and a spacing ring A cylindrical sleeve member or housing vindicated generally by the numeral 13 is provided,

and comprises an enlarged hollow portion` 14 which yis internally threaded for a part of its length at 15', for a `vpurposerhereinafterto be described- The housing has a central portion 16, anda longitudinal passageway 1-7, circular in cross section, passes through the central'portion land the forward endof the portion 14, the passageway being of a slightlylarger diameter than .65 the diameterof the portion 'lof theY pin. The housing also comprises a 'hollow end portion 184 extending from the central portion 16. The por- Y tion 18 is provided with longitudinal openings 19,

2'0 and 21 symmetrically formed in its sides and70 outwardly converging'toward the surfaceof said portion providing cages or sockets for rollers 22. One of the facesof each-of they openings'is at an angle tothe axis of thehousin'g. The rollers Iare tapered to correspond with the taper ofthe end 8 ofthe roller pin,v and fit looselywithin the same because of the restricted distance` between theirfaces at Vthe outer surface ofthe end `portion 18. An opening 23 is formed in the outer end of the portion 18 of the housing through' which The pin is Si adapted to extendthrough the housing, its collar 6 being of a slightly less diameter than v the "interior of `the hollowportion 14 of the housing. When the pinis so insertedwithinrthe housing,

its collar is disposed within the said hollow portion 14 and its tapered end may extend Afor a limited distanceV through the openingy 23. The

and the interior of the hollow portion 14 of the 25 is disposed within the hollow portion 14 adjacent the ledge 24. The" central opening ofthe ring is in alignment with the passageway 1'7` and is of a diameter slightly greater than thediameter of the cylindrical portion 7 of the pin. MThe spacing ring acts as a stop against vwhich the collar 6 strikes, limiting. the outwardl movement "of theroller pin. y A feed or adjusting; nut 26 is provided with an externally threaded surface 27, and the nut is screwed `into the hollow portion 14, its threaded surface engaging the threading at 15 in the hollow portion 14. Ari enlarged knurled head 28 isv formed onthe outer end rof the nut anda central bore 29 is formed longitudi- -f nally through the nut,the` bore being of afdin ledge 31.

ameter slightly greater than the diameter of the central portion 5 of the pin. The pin extends through the bore 29 with its squared end 12 at the rear of the head 28. A part 30 of the body portion of the nut is hollowed out, the interior of the hollow portion being of a diameter greater than that of the bore 29, thereby providing a A spring 32 is disposed around the central portion 5 of the roller pin, and one end of said spring extends into the hollow portion 30 of the nut resting upon the ledge 31. A discshaped seat 33 having a central opening 34 formed therein to permit the passage of the pin therethrough, is disposed within the hollow portion 14 of the housing adjacent the forward end of the spring, providing a seat for said end of the spring. Circular channels 35 and 36 are formed in the opposing faces of the seat 33, and the pin collar 6, respectively, and ball bearings 37 are disposed between the seat and collar in the saidV channels, so that the roller pin may be freely rotated while receiving thrust from the spring.

The end portion 18 of the housing being of a reduced diameter With relation to the central portionl, a'ledge 38 is provided. An annular spacing seat 39, having a centralopening 40, is disposed around the end portion 18 of the housving. The opening is of an enlarged diameter at 41 so that when the inner end 42 of the seat bears against the outer surface of the boiler 1, around the outside of the opening 2, the .projecting end of the plug 3 may extend into said enlarged portion at 41. The end 18 of the housing member is passed through the opening 40 and the housing bears at its ledge 38, against the outer end 43 of the seat, and the housing isthereby held in a fixed spaced position with relation to the boiler and the plug, as shown in Fig.r 1.

In operation, the device is positioned adjacent the boiler, as shown in Fig. 1, with the spacing seat 39 over the end of the plug 3, and the housing as aforesaid extending through the opening 40 and bearing on the spacing seat. When the nut 26 is unscrewed, as shown in Fig. 1, engaging only a few of the threads .of the housing, the spring is not under tension and exerts no pressure upon the seat 33. The pin therefore is not forced out against the rollers and the rollers are permittedA to 'recede below the surface ofthe Yportion 18 of the housing soY that the housing may be inserted Within the plug y3 without interference from the rollers. The spring nut may be adjusted by screwing the same inwardly or outwardly to provide the required tension of the springen the seat 33 so as to force the collar and pin forward, the latter against the rollers. The tapered cam surfaces yof the vpin will engage the rollers 22, forcing the same out- `wardly in their respective sockets 19, 20 and 21.

The spring will thus afford the pin a steady selffeeding action, and when the pin is rotated, the

camr surfaces will cooperate in the transmission `through the tendency of the rollers to feed deeper into the plug, by reason of the effect of the slightfangles of the facesof the roller sockets 19,'20 and 21, aforedescribed.

While there has been hereinbefore described a specific embodiment of the present invention, it Will be apparent to those skilled in the art, that many and various changes and modifications may be made Without departing from the spirit of the invention, and it will be understood that all and any such changes and modifications as fall Within the scope of the appended claims are contemplated as a part of the present invention. i

The invention claimed and desired to be secured by Letters Patent is:v

1. A tool for expanding acylindrical object, comprising an expander member free for lateral movement; a member forforcing said expander member laterally to effect expanding of said object, said forcing member having a surface having a cam effect circumferentially of the forcing member and also a cam effect axially of the forcing member; means for rotating said forcing member to bring said circumferential cam effect into play; and means for feeding the forcing member axiallyto bringV said axial cam effect into play. v

2. A tool for expanding a ,Cylindricalobject comprising an expander member free for lateral movement; a memberl for forcing said expander member laterally to effect expanding of said oblect, said forcing member having a surface having a cam effect circumferentially of the forcing member and also a cam' effect axially of the vforcingv member;A means for rotating said forcing member to bring said circumferential cam effect into play; andV means for feeding the forcf opposite said first mentioned end; means at the outer end of 'said threaded member forturning the threaded member into the housing; a chamber disposed in the opposite'end of said threaded member; a seat secured to said forcing means;

`and aspring disposed in said housing and said chamber, having one of itsr ends abutting said seat, and its opposite end abutting the outer end of said chamber, wherebyy the forcing means may be advanced toward the expanding member b y lthe resilient pressure ofthe spring When the threaded member is advanced.

4. A tool for expanding a cylindrical object comprising an expander memberfree for lateral outward movement for expanding said object; a member rotatable and axially advanceable for forcing said yexpander member laterally outward, Said forcing member being provided with a surface having a cam effect axially of the forcing member operable during axial advancement thereof, and also having a cam effect circumferentially of the forcing member operableduring a part of each rotation thereof; means for rotating said forcing member; and means for axially advancing said forcing member, said rotating means being capable of operation simultaneously with said advancing means, Vwhereby said forcing member will axially advance previous to each saidpart rotationthereof to there.-

member threaded into the end of the housing '120 by successively bring axial and circumferential cam eiects into play. v

5. A tool for expanding -a cylindrical object Y comprising an expander, member free for lateral during a part of each rotation thereof; means for rotating said forcing member; and spring means held under compression for constantly urging said forcing member axially in advanc-v ing direction, said rotating means vbeing capable of operation simultaneously with lsaid spring means, whereby said forcingfmember will be axiallyadvanced previous to each said part rotation thereof to thereby successively bring axial and circumferential cam effects intoplay.

ERNEST DUCHESNE.

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