US1404512A - Radial riveting hammer - Google Patents

Description

E. H. CHAPMAN.

RADIAL RIVE'HNG HAMMER.

APPLICATION FILED osc.s1.191s.

Patented Jan. 24, 1922.

5 SHEETSSHEET l.

A TTORIVE Y8 E. H. CHAPMAN.

RADIAL RIVETING HAMMER. APPLICATION FILED DEC. @1918. 1, 104,5 1 2 Patented Jan 24, 1922. I i 3 SHEETSSHEET 2.

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INVENTOR A TTORNEYS E. H. CHAPMAN.

RADIAL RIVETING HAMMER.

APPLICATION FILED 050.31. 1918.

5 SHEET SHEET 3 2 9 1 4 2 m .10 d m m a P l/Vl/ENTOR v ATTORNEYS mv 6Q WA UEQQQ E. H. CHAPMAN.

RADIAL RIVETING HAMMER.

APPLICATION FILED DEC.3I. 191s.

Patented Jan. 24, 1922.

5 SHEETS-SHEET 4.

M Mm mm X HMWM HI A TTORNEYS E. HI CHAPMAN. RADIAL RIVETING HAMMER.

APPLICATION man mzc.31.191s. 1,494,512. Patented Jan. 24, 1922. \l

5 SHEETS-SHEET 5 EDWARD BI. CHAPMAN, or sonrn BETHLEHEM, PENNSYLVANIA, ASSIGNOR TO BETHLEHEM SHIFBUILDING conrona'rron, ran, on sourn BETHLEHEM, PENNSYLVANIA, a conrcnarron or DELAW'ARE.

RADIAL RIVETING HAMMER.

Specification of Letters Patent.

Patented Jan. 24:, 1922.

Application filed December 31, 1918. Serial No. 269,038.

radial riveting hammer which is especially adapted to be employed in driving rivets in water drums for Yarrow boilers, although as is apparent it is not limited to such use and may be employed in driving rivets in any desired type of construction for which it is adapted.

It further consists of a novel construction and arrangement of supporting mechanism and novel means for securing it with respect to the work, so that the riveting hammer carried by the supporting mechanism is both vertically and rotatably adjustable with respect to the work, whereby the riveter can be easily shifted from one ivet to another until all the rivets in a large area have been driven, without an undue manipulation of the supporting apparatus, all of which can be readily effected by the operator in charge of the machine.

It further consists of a novel construction and arrangement for causing the riveting hammer to be readily advanced and retained in operative position during the driving of a rivet and for readily effecting the return of the riveting hammer to its normal or initial position after a rivet has been driven.

Other novel features of construction and advantage will hereinafter more clearly appear in the detailed description of my in vention.

For the purpose of illustrating my invention, I have shown in the accompanying drawings one form thereof which is at pres ent preferred by me, since the same will be found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and de scribed.

Figure 1 represents a. top plan view of a radial riveting hammer and its adjuncts, embodying my invention, the water drum or cylinder to be riveted being shown dotted.

Figure 2 represents an end elevation of my novel riveting hammer and its adjuncts showing the supporting and counterbalancing devices.

Figure 8 represents a section on line 33, Figure 1, the water drum or cylinder to be riveted being shown in full lines;

Figure 4 represents, on an enlarged scale,

a section on line 4 4t, Figure 3.

Figure 5 represents a section on line 5-5, Figure 4:.

Figure 6 represents a sectional View taken on the same line as that of Figure- 5 but showing certain of the parts in a different relation to each other from that seen in Figure 5.

Figure 7 represents, in perspective, the eccentric pin seen in Figures 2 and 3.

Figure 8 represents, in sectional elevation, anotherembodiment of my invention.

Figurp 9 represents a section on line 99, Figure 10. Y

Figure 10 represents a section on line l0-10, Figure 9. I

Similar numerals of reference indicate corresponding parts.

Referring to the drawings,

1 designates my novel radial riveting hammer and its adjuncts, embodying my invention. 2 designates a radial bracket or quadrant, which is secured in the upper end of a water drum or cylinder 3 to be riveted, by means of bol s or other fastening devices i 5 designates a radial member of a rotatable frame which is shown in the present instance as being a channel bar to secure the necessary rigidity and strength, one end of said member being connected to the bracket 2, by means of a pivot pin 6 which is mounted-in the a-pertured boss 7 of the stationary radial bracket 2. The weight of the frame 5 is carried by a roller 8 mounted in bearings 9 suitably connected with the radial arm 5, said roller travelling on the upper end of the drum 3, as will be understood from Figures 2 and 3.

10 designates a pair of vertical guides, the upper ends of which are secured by means of fastening devices 11 to the outer end of the upper radial arm 5, which being preferably formed of a channel bar or beam serves properly each other.

12 designates the lower radial arm, the outer end of which is provided with a sleeve 13 which serves as a spacing member for the lower end of the guides and through this spacing member passes a. bolt or other fastening device 14, which serves to-connect the radial arm 12 to said guides 10. The inner end of the radial arm 12 is pivotally mounted on the threaded stem 15 of an eccentric pin device 16, best seen in Figures 3. and 7, which has the pin member 18 passing through the lower head 1'7 of the drum and is secured in position by means of a nut in threaded engagement with said pin 18. The eccentric pin 16 is provided with a roughened face 19, best seen in Figure 7, which grips the outer surface of the lower head 17, so that said eccentric pin 16 is fixedly secured with respect to said lower drum head. By such construction the eccentricity of the centers on which the frame composed of the guides 10 and the radial arms 5 and 12 turns is provided for, said centers being given the requisite eccentricity relatively to the center line of the drum which is necessary, in order to have the action of the hammer perpendicular to the surface of the shell at the laps of the seams.

It will be seen from the foregoing that the radial arms or members 5 and 12, together with their adjuncts carried by their inner ends which engage the top and bottom portions of the boiler or drum, respectively, constitute in their entirety centering devices, whereby the guides or uprights 10, together with the pneumatic riveter carried thereby are properly positioned with respect to the axial line of the boiler or drum tobe riveted at all times.

20 designates a carriage orhousing, which is machined as at 21, see Figure 4:, in order to fit between the guides 10. The housing 20 is recessed, as at 22, in order to receive the guide plates 23, which are secured to the housing by means of screws 24, said housing 20 being provided with an apertured laterally extending guiding sleeve adapted to receive the cylinder 26 of the pneumatic riveting hammer.

In accordance with my present invention, I am enabled to employ a cylinder of any standard type of portable pneumatic riveter, such as for example as that of the well known Boyer pneumatic riveter as exemplified in the Boyer Patent #917,242, dated April 6, 1909, since it willbe understood by those skilled in the art that it is only necessary to remove the handle from the cylinder of a portable pneumatic riveter, as shown in said Boyer patent, and screw the rear end of such cylinder as 26, into the threaded seat of a head-block 27, which is formed at to space the guides 10 from the forward end of a piston rod 28, as best seen in Figures 5 and 6, which latter is provided with a piston 29 adapted to reciprocate within a piston chamber 30 formed in the cylinder or casing 31. The piston 29 is preferably formed separate'from the piston rod 28 and consists of a head or body portion 32 having at its forward end a threaded extension 33 which is screwed into the threaded seat 34: at the rear end of the pistonrod 28, as will be understood from Figure 6. The rear end of the head 32 has the projection 35 on which are mounted the packing 36, the follower 37, the packing 3S and the follower 39 in the order named, these parts being held in assembled position by the bolt 40, the packing 36 being pressed outwardly by the pressure of the motive fluid through the ports 41. The forward end of the cylinder 31 has the flange 42 bolted or secured to the flange 43 and the forward end of the piston rod 28 may be packed as will be understood from Figures 5 and 6 by means of the packing it, the gland .45 and the follower 46, which are held in assembled position by the bolts 47. The motive fluid to reciprocate the cylinder 26, the head block 27 piston rod 28 and piston 29, in the desired direction, may be introduced and exhausted from the opposite sides of said piston through valved pipes 48 and 19 communicating with the ports 50 and 51 (see Figure 6) it being understood. that the forward movement of these parts toward the position seen in Figure 5 will advance the buttonset 52 towards the rivet to be driven, while the rearward movement of these parts into the position seen in Figure 6 will cause the buttonset and its adjuncts to recede from the rivet. The motive fluid is introduced into the riveter cylinder at the point 53, see Figures 4, 5 and 6, through the valved hose or supply pipe 54, See Figure 3.

55 designates an eye bolt or the like secured to the housing 20 and having one end of the rope 56 secured thereto, said rope passing over the sheave 57 journalled on the pin 58 carried by the bracket 59, the opposite end of said rope carrying the counterbalance orweight 60, whose function is to maintain the carriage or housing 20 and its adjuncts in equilibrium, so that it can be readily'raised and lowered according to requirements.

In the application of my device to the drum or cylinder 3 to be riveted, as seen in Figure 3, it will be understood that the lower head 17 has been fastened in when the shell is bolted up previous to riveting, and I support the drum on blocks or the like (not shown) arranged so as to permit the frame composed of the parts 5, 10 and 12 to swing approximately 200 degrees.

In the description up to this point, I have described my invention as adapted to be employed in conjunction with Yarrow boilers in which case it is necessary to mount the rotatable frame which carries the riveting device eccentrically with respect to the boiler. In the majority of cases, however, the rotatable frame would be mounted on the axial line of the boiler and during the operation of riveting such frame can be moved in a circle completely around the boiler, it being understood that the supporting devices (not shown) for the boiler or drum to be riveted are so arranged as to permit the axial adjustment of the boiler so as to enable the riveting devices to be presented to every portion of the outer periphery thereof. The only difference in the construction is that the bracket 2 is of such length that the pivot pin 6 is positioned in the axial line of the boiler while the radial arm 12 is connected centrally with the lowerhead 17 instead of eccentrically. As seen in Figure 8, the radial arm 12 is mounted on a pivot pin 61 which is connected with the boiler by means of nuts 62 and a spacing member 63 is preferably employed between the lower head 17 and the radial arm 12.

It will be apparent that in the embodiment of my invention as seen in Figure 8 the rotatable frame can be rotated around the drum so as to bring it into position with any desired rivet hole which latter I have deemed it unnecessary to illustrate in the construction shown in Figure 8.

I desire to direct particular attention to the novel manner in which the carriage or housing 20 is constructed so that practically the equivalent of a universal joint is provided between the housing and the guides 10 in order that the operator can move the housing and thereby the riveter so that the rivet set will follow the rivet. The detailed construction which permits this operation will be best understood from Figures 9 and 10 from which it will be seen that the housing is curved laterally, as indicated at 64: and is curved vertically as seen at 65. By such construction it will be apparent that the carriage or housing 20 can be rocked or oscillated so as to bring the rivet set into accurate alignment with the rivet to be driven and it will be seen that the carriage 20 has suflicient play with respect to the guides 10 to permit such action to take lace. p It will be understood that in both embodiments. of my invention the carriage 2O preferably has the portion cooperating with the guides'lO constructed as seen in Figures 9 and 10 of the drawings. It will thus be seen that the riveting device is both vertically and rotatably adjustable with respect to the drum and it can also be oscillated or rocked both laterally and vertically to enable the correct driving of the rivets.

The operation is as follows The parts having been assembled as seen in Figure 3, the frame composed of the parts 5, l0 and 12, can be readily rotated on the centers, as 6 and 15, the weight thereof being supported on the roller 8. The frame carrying the riveter housing can be readily rotated on its centers and the riveter housing 20 and the riveter being movable vertically in the ways or guides 10, it will be apparent that a wide range of movement is permitted to the riveter, since it can be shifted laterally or vertically from one rivet to another until all the rivets in a large area have been driven, the holder in the inside of the drum being operated by a man inside.

When the parts are in the position seen in Figure 3, the piston 29 and the riveter are in the position seen in Figure 6. A rivet having been placed in position, air is ad mitted through the pipe 49, and the piston 29 moves from the position seen in Figure 6 to the position seen in Figure 5 and the but tonset being new in contact with the heated rivet, air is admitted at the point 53 and the reciprocations of the hammering piston effectively head or drive the rivet, the operation usually requiring but from seven to ten seconds. Air is now admitted through the pipe 48 and the piston 29 travels from the position seen in Figure 5 to the position seen in Figure 6 and the carriage 20 having been shifted vertically or horizontally to the desired extent, the operation is repeated on the next rivet.

It will be seen from the foregoing that in my invention I have made provision not only for a vertical or up and down movement to be imparted to the riveter carriage and its adjuncts, but in addition, I provide for the riveter carriage and its adjuncts to be swung or rotated laterally around the surface or periphery of the drum or cylinder to be riveted and I further provide fluid pressure controlling means for the riveter cylinder to enable it to be advanced towards the rivet to be headed or driven and to recede therefrom without being held in the hands of the operator, whereby the shocks, jars or vibrations incident to the riveting operation are taken up in the framework or rigging by which the riveter is supported and are not communicated to the operator. By the provision of the roller 8 the framework is prevented from sagging and by the provision of the eccentric pins 15 and 18 and their adjuncts together with the serrated face 19, seen in Figure 7, I am enabled to adjust the lower centering device, so that the desired eccentricity for the lower portion of the guides 10 can be readily obtained at any time by merely loosening the nuts on Cir the pins 15 and 18 and shifting the body portion 16 around the pin 18 as a center to the desired extent, said nuts being thereafter tightened.

By the provision of the counterbalance 60, I can readily raise and lower the pneumatic riveter and its carriage according to requirements and through the medium of the guiding sleeve 25 the buttonset 52 of the riveter can be accurately guided in a horizontal direction against the rivet to be headed.

It is obvious from the foregoing that the riveter carriage and its adjuncts can be easily shifted from one rivet to another until all the rivets in a large area have been upset or driven, all of which can be readily effected by the operator in charge of the chine.

Vhile I have shown channel bars or beams as preferably employed for the upper, lateral member it will be apparent that other forms thereof may be employed, if desired, and that the precise manner I have described of constructing the upper and lower laterally extending frames and the upright guides 10 and the manner of assembling them may be varied, if desired, without de parting from the spirit of my invention.

While I have shown the carriage or housing 20 as seen in Figures 4:, 5 and 6 as composed of a body portion having the forward arms which carry the guide sleeve and the rearward arms which carry the flange a3, to which the cylinder 31 is bolted, which construction I preferably employ for lightness, it will be apparent that the contour or construction of said carriage 20 may also be varied without departing from the spirit or scope of the invention.

I have deemed it unnecessary to describe in detail the precise manner of controlling the inlet and exhaust of the pipes 18 and 49, since it will be apparent that any valvular arrangement which will effect the desired control of the inlet and exhaust at the will of the operator may be employed for this purpose and I have also deemed it unnecessary to describe the internal construction of the pneumatic riveter cylinder 26 and its adjuncts, since it will be apparent that any standard pneumatic riveter cylinder may beemployed but I prefer in practice to employ the well known Boyer riveter of substantially the construction seen in the Boyer patent heretofore referred to.

lVhile my invent-ion relates more particularly to an apparatus for riveting and has been so described, it will nevertheless be evident that the carriage or housing 20 and its adjunt-s may if desired be advantageously employed in other work than riveting, since for example inst ad of supporting a pneumatic hammer for driving rivets, the carriage may contain or support a rotary pneumatic drilling, reaming or other tool which requires to be shifted from point to point with respect to the surface of the work.

It will now be apparent that I have devised a novel and useful construction of a radial riveting hammer which embodies the featureslof advantage enumerated as desirable in the statement of the invention and the above description, and while I have, in,

the presentinstance, shown and described a preferred embodiment thereof which will be found in practice to give satisfactory and reliable results, it is to be understood that the same is susceptible of modification in various particulars withoutdeparting from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is

1. In an apparatus of the character stated, a rotatable frame for supporting a pneumatic riveter, composed of upper and lower laterally extending radial members, a pair of upright guides having their ends secured to said radial members, an upper centering device for said upper member, an upper bracket adapted to be secured to the upper inner periphery of the drum to be riveted, said bracket supporting said upper centering device, and a lower centering device for said lower member. 7

2. In an apparatus of the character stated, a rotatable frame for supporting .a. pneumatic riveter, composed of upper and lower laterally ext-ending radial members, a pair of upright guides having their ends secured to said radial members, an upper centering device for said upper member, and a lower cente "ing device for said lower member, said lower centering device comprising a body portion having an upper pin, and a lower pin out of alignment with said upper pin.

3. In an apparatus of the character stated, a rotatable frame for supporting a pneu: matic riveter, composed of upper and lower laterally extending radial members, guiding devices having their ends secured to said radial members, an upper centering device for said upper member, a lower centering device for said lower member, said lower centering device comprising a body portion having an upper pin and a lower pin out of alignment with said upper pin, the surface adjacent the base of said upper pin being serrated, a. tool carriage for a pneumatic tool, vertically reciprocable in said guiding devices. a sheave mounted on the upper portion of said guiding devices, a connection leading from said carriage over said sheave, and a counterbalance on the end of said connection.

4. In an apparatus of the character stated, a frame composed of upper and lower laterally extending radial members, a pair of upright guides having their terminals secured to said radial members, centering clevices at the opposed ends of said members for enabling said frame to be rotated, an up per bracket adapted to be secured to the work for supporting the inner end of the upper radial member, the inner end of said lower radial member being adapted to be carried by the lower head of the work, a roller carried by said upper radial member and adapted to rest upon the upper edge of the work to be riveted, a tool carriage for a pneumatic tool cylinder vertically reciprocable in said guides, and counterbalancing devices for said tool carriage.

5. In an apparatus of the character stated, a frame composed of upper and lower laterally extending radial members, a pair of upright guides having their terminals secured to said radial members, centering devices at the opposed ends of said members for enabling said frame and its adjuncts to be rotated, the lower of said centering devices being eccentrically disposed with respect to the upper centering device and adapted to engage the center of the head of the drum to be riveted, a tool carriage for a pneumatic tool cylinder vertically reciprocable in said guides, and counter-balancing devices for said tool carriage.

, 6. In an apparatus of the character stated, a frame composed of upper and lower laterally extending radial members, upright guides having their terminals secured to said radial members, centering devices at the opposed ends of said members, a tool carriage for a pneumatic tool cylinder vertically reciprocable in said guides, counterbalancing devices for said tool carriage, and a roller journalled upon the upper member of said frame and adapted to travel on the upper end of the cylinder to be riveted.

7. A carriage for a pneumatic tool, comprising a body portion, a forwardly extending guide sleeve thereon, a rearwardly extending cylinder on said carriage and in alignment with said guide sleeve, said cylinder having ports for the admission and exhaust of motive fluid at each end thereof, a piston in said cylinder, a piston rod projecting forwardly therefrom, packing devices for the forward end of said piston rod, a head block formed on the forward end of said piston rod and having an internally threaded seat, and apneumatic tool cylinder slidable in said guide sleeve and having its rear threaded end in engagement with the threaded seat of said head block.

8. A carriage for a pneumatic tool, comprising a body portion, a forwardly extending guide sleeve therein, a rearwardly extending cylinder on said carriage and in alignment with said guide sleeve, said cylinder having ports for the admission and exhaust of motive fluid at each end thereof, a piston in sald cylinder, a piston rod projecting forwardly therefrom, packing de-v vices for the forward end of said piston roe, a head block formed on the forward end of said piston rod and having an internally threaded seat, a pneumatic tool cylinder slidable in said guide sleeve and having its rear threaded end in engagement with the threaded seat of said head block and a pair of upright guides for said carriage body, the sides of said carriage body being recessed to fit said 'uides.

9. A carriage for a pneumatic tool, comprising a body portion, a forwardly extending guide sleeve thereon, a rearwardly extending cylinder on said carriage and in alignment with said guide sleeve, said cylinder having ports for the admission and ex- 1 haust of motive fluid at each end thereof, a piston in said cylinder, a piston rod projecting forwardly therefrom, packing devices for the forward end of aid piston rod, ahead block formed on the forward end of said piston rod and having an internally threaded seat, a pneumatic tool cylinder slidable in said guide sleeve and having its rear threaded end in engagement with the threaded seat of said head block, a pair of upright guides for said carriage body, the sides of said body being recessed to fit said guides and means for enabling said carriage and its adjuncts to be adjusted vertically.

10. A carriage for a pneumatic tool, comprising a body portion, a forwardly extending guide sleeve therein, a rearwardly extending cylinder on said carriage and in alignment with said guide sleeve, said cylinder having ports for the admission and exhaust of motive fluid at each end thereof, a piston in said cylinder, a piston rod projecting forwardly therefrom, packing devices for the forward end of said piston rod, a head block formed on the forward end of said piston rod, and having an internally threaded seat, a pneumatic tool cylinder slidable in said guide sleeve and having its rear threaded end in engagement with the threaded seat of said head block, a pair of upright guides for said carriage body, the sides of said body being recessed to fit said guides, and means for enabling said carriage and its adjuncts to be adjusted vertically and laterally.

11. In a device of the character stated, a radial bracket adapted to be secured to the upper inner portion of the drum to be riveted, an upper radially extending member pivoted to said bracket, a lower eccentric pin having an upper pin member adapted to be secured to the center of the bottom head of said drum to be riveted and its lower member out of alignment with said upper pin member and p ojecting down wardly, a lower radial member mounted on said lower member of said pin, and a pair of upright guide members having their terminals secured to said upper and lower radial members.

12. In a device of the character stated, a radial bracket adapted to be secured to the upper inner portion of the drum te be rivet ed, an upper radially extending member pivoted to said bracket, a lower eccentric pin having an upper threaded pin member adapted to be secured to the center 01": the bottom head of said drum to be riveted and its lower pin member eccentric to said upper pin member and projecting downwardly, a lower radial member mounted on said lower pin member, a pair of upright guide mem bers having their terminals secured to said upper and lower radial members, and a riveter carriage supported in said upright guide members.

13. In a. device of the character stated, a radial bracket adapted to be secured to the upper inner portion of the drum to be riveted, an upper radially extending member pivoted to said bracket, a lower eccentric pin having an upper pin member adapted to be secured to the center of the bottom head of said drum to be riveted and its lower pin member being eccentric to said upper pin member and projecting downwardly, a lower radial member mounted on said lower pin member, a pair of upright guide members having their terminals se cured to said upper and lower radial members, a pneumatic riveter carriage supported in said upright guide members, and counter balancing devices for said riveter carriage.

14:. In a radial riveting device, a. pair of upright guides, laterally extending upper and lower members secured to said guides, a centering device for said upper member, a centering device for said lower member, comprising a body portion having an upwardly threaded pin, a serrated portion near the base of said pin, and a lower threaded pin out of alignment with said upper pin, and a pneumatic riveter carriage vertically movable in said guides.

15. In a radial riveting device, a pair of upright guides, laterally extending upper and lower members secured to said guides, a centering device for said upper member, a centering device for said lower member, comprising a body portion, having an upwardly threaded pin, a serrated portion near the base of said pin, and a lower threaded pin out of alignment with said upper pin,

'a riveter carriage movable in said guides,

and a pneumatic riveter cylinder horizontally movable in said carriage.

16. In a radial riveting device, a pair of upright guides, laterally extending upper and lower members secured to said guides, a centering device for said upper member, a

centering device for said lower member, comprising a body portion having an upwardly threaded pin, a serrated portion near the base of said pin, and a lower threaded pin out of alignment with said upper pin, a carriage movable in said guides, counterbalancing devices for said carriage, a pneu matic riveter cylinder slidingly mounted in said carriage, a piston rod attached to said cylinder, a piston on said rod, and a cylinder for said piston.

17. In a device of the character stated,

a rotatable frame composed of an upper laterally extending U-shaped channel bar, a. lower laterally extending member, upright guides having their upper ends secured to the sides of said channel bar, a spacing device for the lower ends of said guides, the latter being attached to said lower member, and centering devices carried by said upper and lower members.

18. In a device of the character stated, a rotatable frame composed of an upper laterally extending U-shaped channel bar, a lower laterally extending member, upright guides having their upper ends secured to the sides of said channel bar, a spacing device for the lower ends of said guides, the latter being attached to said lower member, and centering devices carried by said upper and lower members, said lower centering device comprising a body portion having an upper pin, and a lower depending pin out of alignment with said upper pin.

19. In a radial riveting device, a frame having upper and lower radial arms, upright guides common to said arms, means to rotatably support said arms with respect to adrum, a carriage vertically adjustable in said frame and provided with a recess having a convex bottom therein, whereby said carriage is capable of lateral oscillation with respect to it, and a riveting device on said carriage.

20. In a radial riveting device, a frame having upper and lower radial arms, means to rotatably support said arms with respect to a drum, acarriage vertically adjustable in said frame and provided with a recess having a convex bottom therein, whereby said carriage is capable of vertical oscillation with respect to it, and a rivetinggdevice on said carriage.

21. In a radial riveting device, a frame having upper and lower radial arms, means to rotatably support said arms with respect to the work to be riveted, a carriage vertically adjustable in said frame and provided with a recess having a convex bottom therein, whereby said carriage is capableof both vertical and lateral oscillation with respect to it, and a riveting device on said carriage.

'22. I11 a radial riveting device, a frame having upper and lower radial arms extending to the center of the work to be riveted, means to rotatably support said arms with respect to the work to be riveted, a carriage vertically adjustable in said frame and capable of both vertical and lateral oscillation with respect to it, a riveting device on said carriage, and a counterbalance for said riveting device.

23. In a radial riveting device, a frame having upper and lower radial arms extending to the center of the work to be riveted, means to rotatably support said arms with respect to the work to be riveted, a carriage vertically adjustable in said frame and capable of both vertical and lateral oscillation with respect to it, a riveting device on said carriage, and means to effect the lateral adjustment of said riveting device with respect to the work to be riveted.

24. In a radial riveting device, a frame comprising an upper radial arm, an upper bracket having a segmental portion adapted to be secured to the inner periphery of the upper portion of the drum to be riveted, said bracket having the inner end of said upper arm pivotally secured thereto, a lower radial arm, a centering device extending upwardly from the inner portion thereof and adapted to engage the bottom head of the drum to be riveted, a pair of vertical guides common to said radial arms, a roller journalled in the bottom of said upper radial arm and adapted to travel on the upper edge of the drum to be riveted, a carriage vertically adjustable in the guides of said frame and capable of lateral oscillation with respect thereto, and a riveting device on said carriage.

EDWARD H. CHAPMAN.

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