US2381690A - Riveting apparatus - Google Patents

Description

ug. 7., 1945. P. scHULTzE RIVETING APPARATUS Filed Nov. vs. 1942 ATTORNEY the part or Patented ug. 7, 1945 RIVETING APPARATUS Paul Schultze, Danbury, Conn.,.assignor to Doran Brothers, Incorporated, Danbury, Conn., a corporation of Connecticut Application November 3, 1942, vSerial No. 464,421 4Claims. (Cl. 218-49) Thisinvention relates to apparatus for riveting.

i One of the objects or this invention is to DTO- vide a simple, practical and inexpensive device for heading over rivets or the like. Another `object is to provide a riveting apparatus of the abovementioned character that will bey simple to handle or manipulate, that will be of good and reliable action, and that will effect lefficient and improved `setting up `and completion of the riveted joint or junction.

Another object is to` provide a simple, practical and efficient apparatus for vfacilitating the achievement of better and proper relationship between the rivet and a rivet washer or the like and parts to which the rivet is to be secured by heading it over, Another object is to provide an apparatus of the above-mentioned character in which preparatory compression or compressing against the head of the rivet, of the `partorparts to be secured may be achieved in a simple,` dependable and elcient manner; another object is to carry out this last-mentioned object "by way of apparatus that will be of comn pact construction and reliable action and capable of achieving substantial `uniformity of action in f successive operations. Another object is to provide an apparatus of the above-mentioned char-- acter by which in general to facilitate riveting operations and to improve the character and strength of the resultant fastening, particularly where one or more of the parts to be secured is relatively yieldable. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements,

and arrangements of parts as will be exemplified in the structure to be hereinafter describedand the scope of the application of which will be indicated in the followingy claims.

In the accompanying drawing in which is shown by way of illustration a 'preferred embodiment of the mechanical features of my invention,

Figure 1 is a central longitudinal sectional view of the riveting apparatus shown in relation to a part or parts to which a rivet is to be securedand Figure 2 is a transverse sectional View as seen along the line 2--2 of Figure 1.

Similar reference characters refer to similar l parts throughout the several views of the drawing..

In the preferred form of construction the apparatus preferably comprises two relatively slideable and preferably telescopically arranged casing-like members l0 and Il preferably cylindrical with the inside diameter of member II large enough to receive slideably therein the other lthrough a suitable hole punched at member I0 and thus to provide for each otherV good large-area bearing surfaces for guiding each other during relative sliding movement therebetween. At the outer end of the inner member II), is provided a part I2, preferably and conveniently annular in cross-section, to take over or about the shank end of the rivet and to present an end annular aceof appropriate area to press against the part or parts to which the'rivet is to be secured or which the rivetis to secure or fasten. n v i To better illustrate certain features of construction and action, let it be assumed that one or more of the parts which are to be clamped or fastened bythe rivet is of a material that is relatively yieldableas compared to metal, and in Figure l I have assumed, for purposes of illustration of a practical application or functioning of my apparatus that a conveyor type `of belt or` the like made up `of a suitable flexible material I3, such as rubberized canvas belting, is to have secured to it at suitable intervals transverse'slats of, for example, wood, and of which vone is shown in Figure l at I4. Thus a rivet R is shown in Figure l passed the appropriate point in the element I3, with its head I-I overlying'a substantial area of the material I3 `and lWith its shank S passed through a suitable Yhole drilled through the member I4 and preferably countersunk as at HIa to a suitable depth and to a diameter to accommodate therein and about the projecting portion of the shank S a Washer W over and against the right hand face of which the excess portion of the shank S is to bev hammered or headed or spread. This end portion of the shank S may be given any desired or suitable configuration and in the illustrative application of my apparatus the shank end may be counter-bored or hollowed out to facilitate lateral spreading andv heading over, though it will be understood that any other suitable shape or configuration, including a solid shank end, may

be utilized if desired.

' shown in Figure l as head and related asy The presser element I2 is preferably formed on the end wall |5 of a cylindrical cap-like member I6 whose cylindrical wall |1 snugly receives therein the left-hand end of the casing member I0 whose end annular face preferably abuts against the inner face of the end wall l5, thus to insure better transmission of the compressing force that, is to be applied, to the presser element I2, and the mounting of the end cap member I6 is preferably detachable, as by a set screw |8, whereby the part I6 may be readily removed and replaced by another whose presser element I2 is of a diierent size or shape or by one whose bore 20 is of different dimension, according to such factors as the size of rivet to be operated upon, the size of washer, the size or character of other parts to be clamped by the rivet, etc., etc.

-The bore 20 is coaxial with the cylindrical wall l1 of the cap member |6 and as the latter and the casing member IU are telescopically tted together upon assembly and locked in place by the set screw i8, the bore 20 thus becomes positioned coaxially with the coinciding axes of the telescopically arranged casing members I 0 and and in casing member I0 is slideably contained and guided a cylindrical carrier or head 2| having in its forward or left-hand end a recess, such as a cylindrical hole 22 preferably coincident with its axis, for removeably receiving the shank 23 of the rivet-hammer or'plunger 24 which is preferably provided with a heavy shoulder 25 to rest against the left-hand or front face of the cylindrical head 2| The rivet plunger 24 may be removeably held assembled to the head 2| in any suitable Way as, for example, by a setscrew 26 threaded into a radially extending hole in the head 2|. f

The plunger 24 is of a diameter to freelyv enter the bore 20 of the presser head member I6 and, by the above-described mounting, it is held coaxial with that bore; it is of a length somewhat in excess of the length of the bore 20, substantially as indicated inFigure 1.

The rear or right-hand integrally formed with it or suitably secured thereto a guide rod 21 that is coaxial with the head 2| and whose right-hand or free end is slideably received in a hollow cylindrical tubular guide element 28 rigidly supported coaxially with the outer casing member II in any suitable way, as, for example, by a heavy collar 30 which is received into the outer end of the casing member and into a suitable bore in which the hollow cylindrical guide 28 is tightly fitted, the three parts being rigidly held together in any suitable manner as by welding as indicated at 3|.

Parts 21 and 28 will thus be seen to be slideably and telescopically related to each other and about them extends a helical compression spring 32 of appropriate or substantial strength or powend of the head 2| has er, and in its uncompressed state and with the above-described parts and others later to be described in the position as shown in Figure 1, it has a length such that its ends just about abut respectively against the end collar or wall 30 of the outer casing member I| and against the right-hand end of the head 2|.

In just about these relative positions of the various parts, a latch 33, preferably spring-biased as by spring 34 and carried by and with the head 2| becomes free to swing into a longitudinally extending slot 35 in the casing member IU so that one wall of its notch 36 abuts against the left-hand end wall of the slot 35, thus to limit movement of the head 2| toward the left relative to the casing member I0, while the other wall of the notch 36 rests against the inner wall of the casing member I0 to limit the extent of this counterclockwise movement of the latch 33 under the bias of the spring 34.

The latch 33 is relatively heavy and substantial in structure and with the spring 34 is mounted in the head 2| in any suitable way. But for purposes of greater ease of assembly and greater durability and strength of mounting, the latch 33 is simply set into a substantially rectangular recess 31 formed in any suitable Way in the head 2| and provided with a suitably curved or cylindrical end wall portion 38 into which the arcuate end portion 33a of the latch 33 is received, and serving also as a pivotal support for that end of the latch.

The recess 31 is of a width substantially the same as the width of the slot 35 in the casing member I0 and the respective side walls of the recess 31 and of the slot 35 are held in respective alignment with each other and against relative rotary displacement by a longitudinally extending slot 40 in the casing element IU and a screw 4| threaded into the head 2|, the cylindrical head of the screw 4| and the slot 4U neatly intertting so as to prevent material relative rotary displacement during relative sliding movement between the parts I0 and 2|.

'Ihe latch 33 is of a thickness slightly less than the width of the recess 31 and width of the slot 35 and is of greater length than the recess 31 so that, after the spring 34 has been inserted into the radially extending hole 42 in the head 2| and opening into the recess 31, the arcuate end 33a of the latch 33 is rst slipped into the undercut arcuate seat 38, and thence is swung in clockwise direction to compress the spring 34 and to enter the left-hand end of the latch into the recess 31, just clearing the left-hand end wall of the latter. When so assembled, the head 2| with the latch 33 may be slid into the casing member I0 the walls of which close off the recess 31 upon such assembly, whence the'guide screw 4| may be put in position by threading it into the hole 43 in the head 2|, through the slot 4U.

The slot 40 is of a length to permit movement of the head 2| toward the right-hand end of casing member 0 suiliciently to permit the latch 33 to become operative as a stop element by letting its latching portion enter the slot 35, 'and to permit sulicient movement of the head 2| toward the left to permit the rivet plunger 24 to completely enter the bore 20.

The underface 33b of the latch 33 as seen in Figure 1 is shaped to provide what is in effect a cam of easy slope when entered into the slot 35 of the inner casing member I0, and upon the outer casing member I provide an element 44 for engaging the cam portion 33b and for actuating the cam 33 in clockwise direction, thus to trip it out of stopping or holding position, at the desired point in the stroke of movement toward the right of casing member II relative to the casing member I, and conveniently member 44 comprises a bar cross-sectioned .to fall relatively g and the outer face ofthe justably secured to the. casingmember I0 and this. is preferably achieved bya slot 45 extending longitudinally in the cylindrical wall of the casing..member II having extending therethrough, and threaded into Athe member 44, two longitudinally .spaced screws 4BV and 41 whose heads externally overlie the slot 45but preferably with a clamping plate 48 interposed between the heads casing member I I which is preferably milled olf flat as at 52 on each side of the slot. 45 to provide ilat faces against which the clamping plate 48 may rest.

.The longitudinal spacing of thescrews 46.-41, `whose Shanks snugly t theslot 4,5, insures 1ongitudinalalignment of the latch-actuating `member 44, with the slot` 35 in the other casing member, the Width of the member 4,4.being therefore greater-than the width ofl the slot 45 to overlie and engage the inner surfaces of the casing mem-I ber I I to each side of the slot 45. Accordingly, a secure clamping action may be effected to hold the member 44 assembled to the casing member Il and in the. selected position thereof len-gthwise ofthe slot 45. i. n

With the head 2 I. and related parts assembled tothe casing member I as above described and with the spring 32 slipped over the guide rod 21 of the head 2|, the outer casing member II` may be .telescoped onto the right-hand end of the casing member I0, the latch lcontrol.. member 44 being entered into the slot; 35; 50 is threaded into a hole near `the lright-hand endof casing member III, the screw being passed through a casing member Il, withthe screw head diametered for sliding t with, thewalls of the slot I, whereupon the screw head and slot 5I and also the latch control member 44and the slot 35 may thereafter coact to, guide the two telescopic casing members I0 andl I during their relative slidingmovements and. to holdthem against material relative rotary displacement. Preferably, in thislatter connection, I provide more play or leeway in the iit v,of the latch control member `44 in the slot 3.5 thanv in theiit. of the head of the screw 50 in the slot 5I, thus, to reduce friction during operation and to avoid having to provide too,` precise alignment of the latchcontrol member. 144 relative to the slot 35.

The 'length of. the slot 5I- is such that it permits outer casing. member I I to move toward the thereupon a screw longitudinallyextending slot 5I in the necessary to achieve such compression of the right relative. to inner casing member lil,` with the Yhead ZIWithdrawn and the latch33 in pingjposition as shown, to accommodate the spring 33 between its abutments 2i andl 30 `:freely and in` uncompressed condition, and to permit movement of the casing member IIV to the left relative to casing member Ill to an extent suicient to bring the cam portion 44EL of the member 44 into coaction with the latch-cam portion 33b and sumciently so to swing the latch 33 in clockwise direction completely out of engagement with the end wall of the slot 35. i

Having .assembled the rivet and ythe parts such as the members I3, I4 and W, and having suitably backed up the head end of the rivet R as by the anvil A, the apparatus, with the parts positioned as shown, is by the operator put into position with-the presser element I2 of the head end resting against the outermost of the parts, such as the washer W, which are to be clamped between the head of the rivet and the shank end thereof to be headed over. The operator, using the casing member I I as a handle, presses toward the 'left and has to exert sucient force to comstopl purposes; thus it 'the rivet R, its shape or ness-of` clamping desired, and the like, the operation may or may not be repeated and if respring y3.2is made effective to compress the elements -I3and I4 lbetween the head Hof the rivet R andthe washer W and thereby also the washer W becomes seatedwell down upon the shank of the rivetR and, moreover, it is also thereby pos-- sible to maintain it `neatly in coaxial relationship with the rivet shank S. That force thus makes.vv

certain that the part or parts to` be clamped by the rivet. are well seated against the head H of therivet and thus guards. against the premature commencement of a heading-over operation upon the rivet shank.L During that interim of time, the compressionof the spring 3,2 results in the storage of energy in the latter and when the latch 33 is disengaged at substantially the end of the compression stroke, that .energy is suddenly released, and the head 2l plunger. rivet, enters the` ing Yend ofthe bore 20 and strikes the projectfactors as the material. operated upon, the particular` metal employed in conformation, the tightpeated any desired` number of successive operations like that above described may be effected. But each time, it will be noted, the reaction to the forces applied to compress the spring. 32 is i effective to act upon the part or partsv being clamped .by the rivet in the manner above described,` though it will be appreciated that it is at the outsetl of the riveting operation that these preliminary or preparatory actions of the apparatushave their greatest effectiveness.

Upon the conclusion ofeach blow administered by the released hammer plunger 24, the apparatus is restored to the relative positions oi' the parts substantiallyv as` shown in the drawing, andl this is easily and quickly achieved in this apparatus `for all that the operator need do is to takehold of the apparatus by the left-hand end of' thev `casing member II), as by grasping the head end I6, and let the apparatus swing downwardly with this `left-hand end of the casing member I0 as a pivot or axis; the weight of the outer casing member II causes it to slide axially in a direction away from the inner casing mem- 'ber I0 until the left-handA end of slot 5I and the screw 50 engage each other, and the head 2| with related. parts', including` the spring 32,`

partake of movement in .similar directions, movement of the head ZI toward. the right as viewed in Figure l relative to the casing member I0 being limited by the engagement of the righthand end of slot 4l! and the screw 4I, latch 33 dropping under the bias of spring 34 into engagement with the left-hand end wall of slot 35 of casing member I0, thus conditioning the apparatus for repetition of the cycle of operation above described.

In Figure l the parts are shown in the positions they occupy subsequent to such restoration of the various parts but after taking up such looseness or play as is desirable to effect the above-described coactions for restoration will be noted that casing member II is still free to move toward the right by the small amount of space between the screw 5U and the left-hand end of slot 5I and head 2| could still move slightly toward the right relato com-press 44 trips $119 carrying the hammer-like 24 is proJected at high velocity to the.

y rivet shank S a substantial blow.. Depending upon such the right hand end wall of slot 40, and it is these relatively small amounts of play that insure that;`

without having tocompr'ess spring 32, the latch 33' can' be bodily moved to vthe right beyond the positionshown in Figure 14 to a slight extent to insure that it freely drops into stopping or engag'ng position, the playI however being insuf-` ficient to ride the horizontal wall portion of the notch 36 out of engagement with the inner wall of the'casing member I0. Y

Ifjit is desired to change the power of the blow exerted by the riveting plunger 24, the cam control member 44 is shifted so that its cam portion' 44a actuates the'latch cam 33b'at a different'point in the stroke ytliatvis exerted to com-.- press the spring 32, and` this is readily achieved y 'the vadjustable clamp mounting of the member44 in the form of the clamping plate 48 and the screws 46-4`L Also the pressure element head I6 and the riveting lhead y24 may be easily and lquickly replaced by corresponding parts of different sizes or dimensions, and thus the apparatus will be seen tov have a wide adaptability in practicaluse. But in all such cases, it `will also beseen, I am enabled to'achieve quickly and dependably proper pre-compression of the part or parts te' be engaged between the head of the rivet and the headed-over shank end and more,

particularly I am` enabled to avoid theushortcomings, deciencies and weaknesses and lack of uniformity of holding action that result, according to prior'practices', from inability or failure properly to position and hold the washer before the rst blow is struck. ,'IA'hat rst blow has the Aeffect of expanding the shank into tight engage-` ment with the washer andvif thelatter is not properly positioned at the outset, ineilicient, defective and undesirable riveting junctures result. With my apparatus, however, such deficiencies can be avoided and nicety and uniformity of proper riveting action achieved.

As many possible embodimentsmay be madel 'of the mechanical features of the above invention and 'as the art herein described 'mightbe varied in various' parts, lall without departing kfrom the scopeof the invention, it is tobe understood A that all matter hereinabove set forth, or shown in the accompanying drawing, is to be inter- V pretedas illustrative and not in a limiting sense.

yI claim:

"l1 Two tubular telescopic casing members the h inner lof which has at itsforward end apertured presser means and has a slot in its wall extend-- f"- ing from its rear end to an intermediate point, a striker head slidably supportedfor axial moveouter member and said striker head to become stressed prior'to actuation of said latch byA said part.

2. A construction as 'claimed in claim 1, in which said striker head is provided with a recess in a side thereof, said latch being accommodated in said recess, with means biasing said latch outwardly of said recess. '4

3. A vconstruction as claimed in claim 1,4 in which said latch-actuating part comprises an elongated'member positioned internally of said outer casing member and having means accessible from the exterior of said outer member for adjustably securing it in position lengthwise of said outer member to thereby set the point at which it is to actuatev said latch.

4. Two't'ubulartelescopic casing members the inner of rwhich has at its forward end apertured presser means, a striker head slidably supported for axial movementin said inner member and having a striker' aligned with said apertured presser means,` said striker head being substang tially cylindrical` and having in a face thereof exposed to the ywall of said inner casing member recess means, a latch member accommodated in said .recess means together with spring means for biasing said latch outwardly of said recess meansandtowardl the wall of said inner casing member, said wallvhaving means forming a shoulder for coaction with said latch and positioned ata point in the path of movement of said latch asv the latter is carried along with said striker" head, wherebythe latter is held by the latch and shoulder' in a position spaced rearwardly from said presser means, spring means interposed between the rear end of saidouter casing member and said striker head to become stressed,

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