US2344127A

US2344127A - Riveting apparatus

Info

Publication number: US2344127A
Application number: US351278A
Authority: US
Inventors: Carl W Cherry
Original assignee: Individual
Current assignee: Individual
Priority date: 1940-08-03
Filing date: 1940-08-03
Publication date: 1944-03-14
Anticipated expiration: 1961-03-14

Description

Filed Aug. 3, 1940 3 Sheets-Sheet 1 INVENTOR l CARL W CHERRY BY MZ@ ATTORNEY.

c. w. CHERRY RIVETING APPARATUSl Filed Aug. 5, 1940 Marh 14, 1944.

3 Sheets-Sheet 2 INVENTOR.

` CARL W. CHERRY BY gef/740@ Hija ATTORNEY.

' Mardi 14, 1944- c. w. CHERRY 2,344,127

RIVETING APPARATUS Filed Aug'. s, 1940 ls sheets-sheet 5 INVENT OR.

CA RL W CHERRY ATTORNEY.

Patented Mar. 14, 1944 UNITED STATES PATENT O FFicE RIVETING APPARATUS Carl W. Cherry, Carmel, Calif. Application August 3, 1940, Serial N0. 351,278

16 Claims.

This invention relates to a riveting apparatus.

An object of this invention is the provision of a riveting tool into which rivets can be quickly and easily inserted and by which the rivets can be held in the material to be riveted for the application of aligned riveting forces to said rivet. This riveting tool is particularly adapted for use with rivets having relatively movable parts for performing the riveting operation from one side of the object lto be riveted; for instance the rivets herein used are the type provided with a movable tension member in a tubular rivet with a tailformer on the tension member at the tail end of the rivet for fastening the rivet in place. Such a rivet is illustrated in my said .patent and that form is utilized herein for illustrating the operation of this riveting apparatusfl` Another object of this inventfonfis tov provide a riveting apparatus whereby all riveting forces may be applied from one side only although aligned forces are exerted at both ends of the rivet.

Another object of this invention is to provide a riveting apparatus which receives the rivets to be applied, holds each in position for riveting, and applies riveting forces with great efnciency; the apparatus including a riveting tool suitably connected to relatively movable elements for application of forces in aligned opposite directions but from one side of the object to be riveted; said apparatus being adapted to receive the rivets for the rivetingv operation rapidly, and assure speedy, yet uniform riveting.

I am aware that some changes may be made in the general arrangements andcombinations of the several devices and parts, as well as in the details of the construction thereof without departing from the scope of the present invention as set forth in the following specification, and as defined in the following claims; `hence I do not limit my invention to the exact" arrangements and combinations of the said device and parts as described in the said specification, nor do I confine myself to the exact details of the construction of the said parts as illustrated in the accompanying drawings.

With the foregoing and other objects in view.

which will be made manifest in the following detailed description and specifically pointed out in the appended claims, reference is had to the accompanying drawings for the illustrative embodiment of the invention, wherein:

Fig. 1 is a side view of my fluidriveting ap params, partly in section.

Fig. 2 is an enlarged sectional view of the riveting end of the apparatus.

Fig. 3 is a detail plan view of the tool head of my apparatus.

Fig. 4 is a detail view the apparatus. y

Fig. 5 is a sectional viewnthe section being taken on the lines 5,-5 of Fig. 4.

Fig. 6 is a fragmental sectional view of a modied rivet holder for my apparatus.

Fig. 7 is a sectional view taken on the line T1 ofFig. 6. A v

Fig. 8 is a fragmental viewV of a iiuld riveting apparatus for my rivet with-automatic feed.

Fig. 9 isa fragmental viewof the discharge end of theriveting apparatus showingathe-rivet feeder in rellingpositionl I Fig. 10 is'partlyanendv -an partlyafcross sectional view ofthe rivetlngfapparatus onf-the lineIll-ID of Fig. 9.

Fig. 1 1 is an end view of the riveting apparatus, in section taken on the line ll-II of Fig. 8.

Fig. 12 is a fragmental-side view ofthe rivet feeder of the apparatus.

Fig. 13 is. a fragmental sectional view of a modified rivet holder formyriveting apparatus.

Fig. 14 is a fragmental mentioned modiiled riveting apparatus.

Fig. 15 is a sectional view of a form of my riveting apparatus showing a manner of application of forces. .f

Fig. 16 is a fragmentai sectional detail view of the riveting apparatus shown in Fig. 15,sh'owing the application of pressure in' stages.

Fig. 17 is a sectionaljview'ofa' -modied form of the rivetrholdertool head oi' the riveting apparatus, and

Fig. 18 is a sectional view used with my apparatus.

Fig. 19 is a sectional view of the arrangement of the actuating valves in the handle o1- the riveting apparatus.

My n'veting apparatus is of rivets shown in Fig. 18 assembly I9, made of a tubular rivet body 20 with the usual rivet head 2| and a shank 29 extended through the passage of the rivet body. The rivet shank 29 has a tail former 24 at one end'opposite the tail end of the rivet body 20, and has a pulling portion, in this form a pulling head 3| on its 4end of. the shank hoider of of a rivet of the t'ype best fitted for the type outside of the head of the rivet body 20. A line of Jsidefviewoi the last herein, namely a rivet so that the rivet lshank 29 cannot change its relative position in the rivet body 28 except by the application of actual riveting forces.

m apparatus herein provides a holder for accommodating the contour of the rivet assembly i9 and to receive and hold the rivet assembly |9 in riveting position. a riveting apparatus so related to the holder as to exert relative forces on the shank 28 and the rivet body 20 for forming the tail of the rivet against the objects to be riveted, vand a feeding mechanism for automatically feeding the rivet assemblies |9 one by one into said holder. In general a rivet assembly |9 is fed into the holder and is held thereby so that the tail of the rivet assembly i9 protrudes from the holderand can be inserted into the rivet hole 21 and` through the objects to be riveted.

such as plates 28 in Fig. 18. The hcideris carried by the riveting apparatus, such as a so-called riveting gun. which presses one part of the holder against the rivet head 2| and pulls another part of the/holder with the shank 20 oppositely so as to cause the tail former 24 to spread the tail of therlvet body 20 against'the adjacent plate 28.

In carrying out my invention I make use of.' a cylinder 8| and a piston 82 which is actuated by compressed air or the like admitted throughi...

In operation a rivet assembly i9 is fed into the tool head through the side slots 98 and lli, the ilange 89 being held by spring 94 in contact with the pressure seat 91 to permit this insertion of the rivet into the tool, as seen in Fig. l, and the rivet is then placed into the rivet holes end- .wise from one side and tail end rst. The pressure seat 91 of the tool is pressed against the head of the rivet and as the button 84 is pressed pressure is applied to the piston, 82. But since piston 82, piston rod 80, pins 89, collar 98', sleeve 92 and pressure plate 91 constitute a solid connection pressing'against the rivet head, piston 82 cannotvmove under the impetus of the iiuid which entered the cylinder. However, the cylinder-head opposite piston 82 can move under said impetusagainst the torce exerted by the operator in pressing plate 81 against the rivet head and in so moving it pulls the miler sleeve 9| and the frame 8| away from plate 92 to the position a suitable valve mechanism 80 located in a hanl die 80 of the tool. The valve may be opened and closed by a conveniently located pushbutton '84 in the usual manner. The cylinder 8| terminates in a frusto conical tool head 88 in which is a recess 81. In the bottom of the recess are a. plurality, in this ilhstration three, holes 88, through which latter are movable three pins 89. The end of a piston rod so is guided m the recessi and bears against the inner ends of the pins 89." The other ends of the pins 89 bear against the collar 03' of the pressure sleeve 82.

On the tool head 08 is supported the holder which is the aciiiall riveting tool and which includes an inner pulling tube 9| threadedly secured at its upper end to a central boss 95 on the bottom of the tool head 86. On the pulling tube 9| is slidably supported an outer pressure sleeve 92 which latter is secured in a shouldered recess 93 in collar 93 secured to said sleeve 92. a coil i pressure spring 94 bearing against the bottom of the recess 98 and against a shoulder 9B of the tube 9| so as to normally urge the outer sleeve 92 upwardly and against the bottom of the tool head 80 and the pins 89 into recess 81. It is to be noted that the spring 94 is suillciently strong to push the pins 89 into the tool head 88 when there is no pressure exerted on the piston 82. The pressure sleeve 92 terminates at its free end in a pressure seat 91 which may be so shaped as to iit the rivet head or the adjacent end of the tubular rivet. The pressure seat 91, as well as the sleeve 82, is provided with cut away portions or slots 88 which nt the contour of the particular rivet in use so as to permit the rapid insertion and removal of the rivets from the sleeve 92. The free end of the pulling tube terminates in a suitably slotted wall or iiange 99 so arranged that the slot |0| thereof accommodates the former shank 29 of the rivet assembly i9 with its pulling head 3| engaged by the flange. In order to facilitate the ejection oi the broken part of the shank 'shown in Fig. 2. Thereby the pins 88 are urged -relatively outwardly through the bottom holes 88 as shown in Fig. 2. 'I'he cylinder is thus forced awayl from the collar 93 of the pressure sleeve 92 to the position shown in Fig. 2. In so doing the cylinder 8| will pull with it the pulling tube 9| so as to pull the tension member or shank 29 of the former for spreading and forming the rivet tail as heretofore described. Therefore the relative movement of the opposed elements of the tool in opposite directions to each otherA is accomplished in a definite operation so that the pulling force of one of said elements is transmitted to the farther end or to the tail of the rivet by means extended through the rivet itself. f

The stroke of the tool may be hunted and predetermined by the length of the pins 89, or by the suitable location of an exhaust port |04 on the cylinder 8| if it is desired to limit the stroke to less than that permitted bythe length of pins 88.

In the modied form of tool shown in Figures 6 and 'l a chuck-like grip is shown to be used with shanks having surface portions to be gripped instead of having a pulling head. This i'orm includes two jaws |06 xedon the end of a pulling bar |01 which takes the place of the pulling tube 9|. From the jaw |00 extends laterally a A guide pin |08 xed to the jaws |08 and threaded at one lend into the nut ||I. Two jaws |09 are also iixed on the end of the pulling bar |01 and wis adapted forcentral insertion and removal ot the rivet former shank 46 and to bear against" the head of the rivet 41. The sleeve H3' is iixed to the collar 93' and the pulling bar |01 is connected to the tool head 88 and after insertion of the rivet into the tool operate in the manner heretofore described in connection with the embodiment illustrated in Fig. 2.

The embodiment illustrated in Figures 8 to l2 inclusive shows how the rivets may be automatically fed into the tool of Figures 1 through'5 shown in Fig. 8 which is adjustable in slots ||5 on the opposite sides of the chute |I4 at its top. At the discharge end ||6 the chute has. fixed thereto one end of a spring bar which holds a gate consisting of an L shaped bar Ii 8 under the last rivet in the chute to prevent its kaccidental removal. An abutment cam ||8 on the free end of the spring bar H1 is adapted to be struck by a feeding arm |2| so as to move the 20- bar H8 out of the way of the lowermost rivet. The spring Ii'l h as a U shaped projection |22 extended from it in spaced relation from the bar 8 and with its attached end farther from the chute than the ends of the rivets and with its free end betwen the two bottom rivets, and with said free end of a length so as to be normally in an out of the way position but to move'I with the gate l i8 so that when the gate ||8 is g'moved out of the line of travel of the rivets the projection |22 is moved under the next rivet in the row atsaid chute discharge end H6. Thus the discharge of more than one rivet at a time is prevented. After the arm |2| is swung away from the` chute yend ||8 the spring ||1 returns thegate ||8 and the rejection |22 therewith into their initialpositions for the next feeding operation.

' There are two feeding arms 2i fixed in spaced s relation on a rocker shaft |23 which lattery is journalled on brackets |24. There is one bracket and thereby to release-the rivet and drop it into the slot 88. In this manner the entire riveting operation may be rendered automatic.

The extent of pressure exerted in forming the tail of a rivet is determined by the breaking of the shanks, .which are preferably made of uniform elastic limit so as to break at the same ultimate stress. But the same may be also determined by the length ofthe stroke to which the former shank is pulled. This can be also accomplished by releasing the grip on the shank of the former after a predetermined stroke.

An embodiment of suchadjustable grip is shown in Figures 13 and 14. In this embodiment the outer pressure sleeve |34 has a pressure seat |38 the central laperture |31 of which is large enough to accommodate the" removal of the gripped end 3| f.

of the former shank 28 therethrough. The inner orpulllns vtube is split 'at its gripping end so as to form two opposed l:Jaws |38 pivoted together at |38. 'Ihe outer surfaces of the Jaws are spaced from the inner periphery of thesleeve |34. A

when the outer sleeve 82 and the pulling mem- I ber 8| are returned to their initial relative posi# tion, then the arms |2I are swung into a parallel position with .and along the sleeve-82. v

exerted through allonger stroke before the jaws |38 are spread apart and-.vice versa.' The cam y ring |4"f may be xed in numerous adjusted posi,- tions by means. of apinfylufextended from lit through an inclined slot`- -'|y43 in one side ofthe pressure sleeve |34 and maybe drawn tight by a locking nut |44 or the like. The cam |4| is split at oneside so' as to provide a gap of sufficient width to allow insertion of the shank of the rivet assembly therethrough within the range a of the average adjustment offits position.

The applicationof forces for the riveting operationv with al comparatively small stroke but 'withgreat power is accomplishedin this apparai tus in the manner shown in'Figures y15- and 18.

Inthecylinder |5|'of this form works a primary pistonl |52. flhepiston |52 is operated by either .hydraulic orrpneumatic pressure through a conduit |53 which is connected to the valve mecha-'- the'handle83. The valve mechanismv so is eentreued by the pusnbutten a4. 'r'heeyi-V nism "in meer mf 1s divided inte two chambers by e trade verse partition wall |54, said wall being secured to the outer shell 8| by screws |54'. A coil Each arm |2i has a leaf springy |3| fixed across P its free end so that the said leaf springs-13| can grip a rivet between them. In order to receive a rivet from the chute the ends of the leaf sp |3| nearest the chute are spreadk apart'byears 32 extended from the chute discharge end I |8iso |3i. The other unspread endsof the leaf springs f |3| prevent the falling out of therivet. As the,

spring |58 between the partition wall |54y and i the piston`1|52 normally urges the piston |52 toward the handle end ofthe cylinder |5I. Abutment pins |51 extend from the partition wall |54 toward the piston |52 sons to limit the stroke of said piston |52 to e predetermined distance from eem the rivet inte suon position that' the rivet is aligned with the'slots 88 and lli of the pressure sleeve 82 and of the pulling tube 8| as shown in Fig. 8. In this returned position said other ends of the leaf springs |3| strike against spreading projections |33 at the edges of the slot 88 of the pressure sleeve 82 so as to be pried apart v n the. partition wall |54. that a. rivet can drop between the leaf springs .Y Vents |58 aroundv the periphery of-.the cylinder |5| vare located at a level slightly above the position of the piston |52 atjthe end of its power stroke. Through these vents |53 the pressure from the cylinder |5| may be released at the vend of the power stroke of the piston |52 thereby facilitating the return of the piston |52 by the action of the spring |58.l A

long hollcwtube with an g v The top oi' the piston head |63 is suitably packed and slidably guided on a hollow boss |64 which latter is extended from the under face of the partition wall |54. On the lower end of the tubular secondary piston |62 is fixed a pressure tip |66 which is guided on the recess 81 of the tool head 86 and bears against the pins 89 in the manner heretofore described in connection with the operation of the piston rod 98 of the form shown in Figures 1 and 2. A second coil spring |61 bears at one end thereof against a shoulder inside the tool head 86I and at its other end against the underside |68 of the piston head |63 so as to urge the secondary piston |62 toward the partition wall |54. This second spring '|61 is shown herein as an upwardly tapering conical coil spring. A cross pin |69 extended through the piston rod |59 near its free end limits the stroke of the piston rod |59 outwardly of the partition wall |54. This secondary piston |62 and its hollow head |63 are filled with grease or like fluid so that the secondary piston |62 may be pressed into contact with pins 88 by the hydraulic pressure created by the displacement action of the piston rod |66 on the fluid Ain the closed chamber of the hollow secondary piston |62. This fluid pressure acts on the interior shoulder 1| of the hollow piston head |63 and on the inner surface |12 of the closed bottom of the piston rod |62 and against the fixed inner surface of the hollow boss |64. The force thus exerted moves the secondary piston |62 toward and into the tool head 86 and applies the ultimate power to the outer shell 8| of the rivet holder which operates -as heretofore described in connection with the operation of the apparatus shown in Figures 1 and 2.

By the differential action between the operation of the primary piston |52 and the secondary or booster piston |62 the power is stepped up and the stroke is shortened resulting in a short and powerful stroke for riveting. As the first piston |52 is returnedfrom its power stroke by the spring |56 the second spring |61 returns the secondary piston |62 to its initial position according to the withdrawal of the piston rod |69. The return movement of the secondary piston |62 is limited by the length of the hollow boss |64 against which the inner shoulder |1| of the piston head |63 abuts at the top of its stroke. In the form of this apparatus as herein illustrated it was found that about a four and three-eighths of an inch stroke of the primary piston |52 will cause a displacement of about three-eighths of an inch stroke of the secondary piston |62, with corresponding boosting of the power applied for riveting.

The modified form of the holder or riveting tool shown in Fig. 17 is substantially the same as the holder heretofore described, except that this modified form shows a mounting of the holder on ariveting gun or apparatus wherein a. reciprocating rod |81 is connected to the Dulling member 88 so as to pull said pulling member |88 when power is applied to the rod |81. The outer pressure sleeve I|89 of this form is fixedly mounted on the face |9| of the riveting gun, In

' this form the pressure seat |92 is flat and has a slot |93 to fit the neck of the stem or shank 28. In this form the rivet is placed into the slots ot the holder so that the pulling head is nested on the end of the pulling member |88, as in the form shown in Fig. 2. Pressure on the rivet head is exerted by holding the riveting apparatus or gun so that the pressure seat |92 is pressed manually against the rivet head holding the rivet in position in the rivet hole. The power is applied in suitable manner for relative axial movement of the pulling member |88 relative to the pressure seat |92 so as to form the rivet tail as heretofore described.

It is to be noted that the relation between the head engaging ends of the pulling tube 9| or the pulling member |88, the respective pressure seats 9'1 and |92, and the respective side slots of the holder is such that a rivet assembly I9 can be inserted sidewise into the holder through the side slots and assume its operative position wherein the rivet head is at the pressure seat of the holder and the pulling head of the rivet assembly is interlocked with the end of the pulling tube or pulling member ready for the riveting operation. 'Ihe holder then holds the rivet assembly in this position for insertion into the rivet hole and throughout the riveting operation. The predetermined relative position of the shank and the rivet tube of the rivet assembly holds the engage a portion of the rivet head and the pulling head of the rivet shank in a uniform constant spacing and contour which lsubstantially iits into the mntour of the side slots, pressure seat and end of the pulling member of the respective holders. 'I'he feeding mechanism can handle such rivet assemblies of uniform constant contour quickly and feed them into the holder to be acted upon uniformly during the riveting operation. This with the uniform predetermined stroke of the apparatus combines in quickly and efllciently performing the riveting operations herein described.

I claim:

l. In a riveting apparatusfor setting a rivet assembly of the type in which a tension member with a tail former on it is assembled in predetermined position within a tubular rivet; a pair of relatively movable riveting elements, a pressure member on one of said elements for engagement with the head of said rivet assembly, engagement means onthe other riveting element for engaging a portion of the tension member of said rivet assembly spaced from the rivet head, means to exert opposite forces on said riveting elements to move one of said riveting elements oppositely to the other for forming a fastening rivet tail on said rivet, said riveting elements having coactingreceiving side apertures ysubstantially corresponding to the contour of the rivet assembly from the rivet head to the end of the 3Q tension member outside of said rivet head, and being adapted to laterally receive each rivet assembly when said riveting elements are in their initial position for engaging said rivet head and tension member of said rivet assembly.

2. In a riveting tool for a rivet assembly in which a tension member with a tail former is extended through a tubular rivet, a pair of coacting' elements being movable axially relatively to each other, a pressure member on one of said elements 40 being adapted to be pressed against the rivet head, engagement means on the other element to tension member outside of said head so as to pull said tension member during thel relative movement of said elements, said coacting elements, said pressure member and said engagement means having aligned openings in the sides thereof for the sidewise insertion of the vportion of the rivet assembly from the M, rivet head to the free end of the tension member, and means to apply oppositely acting forces to said coacting elements.

3. In a riveting tool for a rivet assembly in which a tension member with a tail former is extended through a tubular rivet, a pressure element adapted to exert pressure on the head of the rivet, a pulling element adjacent the pressure element, said elements being axially movable relativelyto each other, engagement means on the pulling element to engage a portion of the tenu" sion member outside the rivet head for pulling the same, said pressure element, pulling element, and engagement means having recesses on a side thereof aligned in the initial position of said elements so as to receive a rivet assembly in align- ,55 ment with said `pressure element, pulling element and engagement means, and means to exert:A forces on said elements in opposite directions to- Y each other for forming the fastening rivet ta`ll;'-'`*V v4. In a riveting tool for setting a rivet assem- 70 -bly of the type in which a tension member with a tail former is extended through a tubular rivet and there is an engagement head on the tension member outside the rivet head; a pair of coacting elements movable axially relatively to each other,

5 one of said elements being adapted to be pressed against the rivet head, an engagement portion of the other element fitting to the underside of the engagement head of the tension member for exerting a pull on the engagement head, the spacing of said engagement portionv and the pressure face of said pressing element when -said elements are in their initial position being the same as the spacing between the rivetv head and the engagement head of the rivet assembly.

5. Inv a riveting apparatus, a riveting tool for use with a rivet assembly having a tension member extended through a tubular rivet and having an engagement head on the tension member outside of the rivet head, a pair or elements telescoped one into the other and being movable axially relatively to each other, a pressure end on one of said elements adapted to bear against the rivet head, a pulling head on the other element adapted to engage the engagement head of the rivet tension member, said elementshav-l ing aligned side inlets for the insertion of a rivet assembly in a predetermined position into said telescoping elements so that the rivet head is engaged with the pressure end and the engagement head is engaged with the pulling head, and means to apply riveting forces to said telescoped elements.

6. In a riveting apparatus, a riveting tool for use with a rivet assembly having a tension member extended through a tubular rivet 'and having an engagement head on the tension member outside of the rivet head, a substantially tubular element, a second substantially tubular.y element vaxially movable Within the iirst tubular'element.

a pressure seat at the end of the first 'tubular element for engaging the rivet head, al pulling head onfthe end of the second tubular element for engaging the engagement head on the tension member, said tubular elements 4having registering openings on the sides thereof for receiving said rivet assembly therethrough sqathat the rivet head and the engagement head ofsaid rivet assembly are in operative relation respectively tol the pressure seat and the pulling head of said tubular elements; and means to apply force for the relatively opposite movement of said tubular elements so as to form the fastening rivet tail.

7. In a riveting apparatus, a riveting tool for use with a rivet assembly having a tension member extended through a tubular rivet and having an engagement head on the tension member outside of the rivet head, a substantially tubular element, a second substantially tubular element axially movable within the iirst tubular element, a pressure seat at the end of the rst tubular element for engaging the rivet head, a pulling head on the end of the second tubular element for engaging the engagement head on the tension member, said tubular elements having registering openings on the sides thereof for receiving said rivet assembly therethrough so that the rivet head and the engagement head of said rivet assembly are in operative relation respectively to the pressure seatl and the pulling head of said tubular elements; means to apply force for the relatively opposite movement of said tubular elements so as to form the vfastening rivet tail until the tension member is broken, and an ejector guide extended substantially across said tubular elements to guide the broken portion of the tension member to the outside of said tubular elements, said tubular elements having registering discharge apertures for the dis- 6 charge of the broken part of therefrom.

8. In a riveting apparatusk for setting a rivet assembly of the type in which a tension member with a tail former on it is assembled in predetermined position within a tubular rivet; a pair of relatively movable riveting elements, a pressure member on one of said elements for engagement with the head of said rivet assembly, engagement means on the other riveting element for engaging a portion of the tension member of said rivet assembly spaced from the rivet head, said pressure member and said engagement means having intake recesses in a side thereof aligned L- receive a rivet assembly in the initial position of said pressure member and engagement means, means to exert opposite forces on said riveting elements at will so as to move one of said riveting elements oppositely to the other for forming a fastening.rivet tail on said rivet, means to automatically feed said rivet assemblies to said riveting elements, said last means including a mechanism connected to the apparatus to carry a plurality of rivet assemblies, and means to transfer said rivet assemblies one lat a time from said carrying means into said recesses.

9. In a riveting apparatus for setting a rivet assembly of the type in which a tension member with a tail former on it is assembled in predetermined position within a tubular rivet; a pair of relatively movable riveting elements, a' pressure member on one of said elements for engagement with the head of said rivet assembly, engagement means on the other riveting element for engaging a portion of the tension member o1' said rivet assembly spaced from the rivet head,

the tension member said pressure member and said engagement means having intake recesses in a side thereof 11. In a riveting apparatus for rivet assemblies having a tension member with a tail former extended through a tubular rivet, the combination with-a pair of coacting riveting elements engaging respectively the rivet head and the tension member so as to transmit opposite forces thereto for forming a fastening rivet tail, a power applying? mechanism comprising, a casing, the riveting l'element engaging the tension member being connected to said casing, a power applying member in said casing, means to normally maintain the rivet head pressing element in contact with the riveting element connected to the tension member, and means of connection between said power applying member and said rivet head pressing element to exert pressure on said rivet head pressing element so that the power applied through said power applying means moves said casing and said riveting element connected to the tension member away from said rivet head pressing element so as to pull the tension member for forming the rivet tail.

12. In a device of the character described, a cylinder, a piston working in the cylinder, means to connect said cylinder to a working tool, a partition in the cylinder, a hollow guide extended from said partition, a fluid lled chamber in said piston, a displacement element slidably extended through said partition and reciprocable into and out of said chamber, another piston of a different stroke than the first piston connected to said displacement member for moving the same in aligned to receive a rivet assembly in the initial position of said ment nans, and means to exert opposite forces to said riveting elements at will so as to move one of said riveting elements oppositely to the other for forming a fastening rivet tail on said rivet, means connected to the apparatus to carry a plurality of rivet assemblies, and means actuated by the relative movement of said riveting elements to feed a rivet assembly from said carrying means into said recesses upon the riveting elements being returned to 'their rivet receiving relationship.

10. In a riveting apparatus for setting a rivet assembly of the type in which a tension member with a tail former on it is assembled in predetermined position within a tubular rivet; a pair of relatively movable riveting elements, a pressure member on one of said elements for engagement with the head of said rivet assembly, engagement means on the other riveting element for engaging a portion of the tension member of said rivet assembly spaced from the rivet head, means to apply forces to said riveting elements so as to move said riveting elements oppositely to each other for forming a fastening rivet tail on said rivet, said riveting elements having coasting receiving apertures substantially corresponding to the contour of the rivet assembly from the rivet head to the end of the tension member outside of said rivet head so as to receive each rivet assembly in the initial position of said riveting elements, and means connected to said apparatus and actuated by the relative movement of said riveting elements after each riveting operation to feed a rivet assembly to said receiving apertures of said riveting elements.

pressure member and engage-A its forward stroke, resilient means to move said pistons on the return stroke and pressure elements at the end of said rst piston slidable through the end of the cylinder to bear against said working tool.

13. In a power applying device of the character described, a cylinder, a primary piston working in the cylinder, a secondary piston in said vcylinder. a partition between said pistons, a guide on said partition to guide said second piston in the cylinder, said second piston having a fluid filled chamber therein bounded partly by said partition and said guide, a displacement element slidably extended from said primary piston through said partition and said guide and into said fluid filled chamber in the secondary piston, resilient means to act to cause the return stroke of said pistons, means to connect said cylinder to a work tool, and pressure elements at the end of said secondary piston being slidable through the end of the cylinder adjacent said work tool to bear against said work tool.

14. In a power applying device of the character described, a cylinder, a primary piston working in the cylinder, cylinder, means to guide said second piston in the cylinder, said second piston having a closed nuid filled chamber therein bounded partly by a relatively stationary surface in said cylinder, a displacement element extended from said primary piston into said fluid filled chamber in the secondary piston, resilient means to act to cause the return stroke of said pistons, means to connect said cylinder to a work tool, and pressure ele- .ments at the end of said secondary piston being slidable through the end of the cylinder adjacent said work tool to bear against said work tool the ratic'between the displacement of saidv displacement element in said fluid chamber and the displacement of the primary piston being such that the resultant stroke of the secondary piston is shorter than the stroke of the primary piston to thereby exert an increased force.

a secondary piston in saidl 15. A riveting tool for setting tubular rivets having a tubular rivet body with a head at one end for engaging one side of the riveted structure, and a former stem extending through said rivet body with a former thereon at the other end of the rivet body, said stem extending beyond the rivet head and having a pulling head thereon spaced from said rivet, head, said tool comprising a pressure member` having an end to bear upon said rivet head, a pulling member axially movable in said pressure member, and means on said pulling member to engage said pulling head on the rivet so as to pull said former stem so as to form a rivet tail on said other end of the rivet body against the other side of the riveted structure, the distance between said pulling head engaging means and said pressure end of said pressure member being substantially the same as the distance between the rivet head and said pulling head at the start oi the riveting operation, said pressure member and said pulling member having registering openings on a side thereof conforming to the contour of the rivet assembly from said rivet head to said pulling head at the start of the riveting operation to permit insertion of a rivet assembly sidewise into said riveting tool members, said pressure members and pulling member being adapted to be engaged by means for simultaneously exerting pressure on the pressure member and a pulling force on said p member. v

16. A riveting tool for setting tubular rivet assemblies having a tubular rivet body with a rivet head on it and a stem extending through the rivet body with a former atthe tail end of the rivet body and a pulling head thereon spaced outside said rivet head, said rivet body and stem vbeing held together to uniformly space the pulling head from the rivet head of each rivet assembly, said* tool comprising a pressure member having an end to bear on the rivet head, a pulling member axially movable in said pressure member, a shoulder in said pulling member to engage the underside of said pulling head of the rivet, and means to pull said pulling member from an initial position relatively to said pressure end of said pressure member and exert a reaction force on said pressure member for pulling said rivet stem and form a tail on said rivet body for setting the rivet in the riveted structure, the distance between said shoulder on the pulling member and the pressure end of said pressure member in said initial position being substantially equal to the distance between the rivet head and the pulling head of the stem of said rivet assembly, said pressure member and said pulling member having registering apertures on a side thereof conforming in said initial position to the contour of the rivet assembly from the rivet `head to the pulling head for the sidewise insertion of said rivet assembly into the riveting tool.

` CARL W. CHERRY.