US2332935A - Riveting device - Google Patents

Description

drawing relating thereto, and "hereinafter set forth.

. Fo'r a bet'ter.understanding of the invention form of the invention;

Patented Oct. 26, 1943 o'N'iTE ES s IVET N biiVIcE l HermanO. Schlaok, Detroit, Mich. t Application November 30, 1942,.Serial N6. 4 7 355" 7 Claims. (o1; tie-:53)

The invention relates generally to rivet. setting devices and it has special relation to mechanism which includes an air hammer for applying hammer blowsto the end of the rivet.

I More particularly theinvention is applicable 1 to riveting mechanism wherein hammer blows are imparted successively to theend of'a rivet by means of a heading tool which at the same time is rotated. Thus, the end of the tool successively hammersthe end of the rivet while. at the same time the tool. rotates so as to effect a spinning action during. formation of the rivet head While mechanism .of this general characteris not new, desirable improvements have been madein accordancewijth the objects of, the invention thereof set forth as follows.

One object of the invention is to provide a riveting mechanism such as mentioned which can be manufactured more economically and assembledand disassembled easily and which can be adjusted positively and-readily in order to adapt themechanismfor a wide range of operatl ing conditions, and in which the driving motor is .adiustably mounted toacconimodate such adjustment;

v 1 Another object crim mamma t pr de a riveting mechanism such as generallyQdesignated which includes a guide between its supporting column and ahead movable thereon sogconstru'cted and'arranged as to enable wear thereof to be quickly andconvenientlytaken up.

Q Another object of the" invention is to provide animproved riveting mechanism such as mentioned wherein improve'dmeans areprovided for gradually and progressively opening andclosing a control valve 'fortlieharr'irner as the mechani'sm islowered and raised during its operation. Another objectof the invention is toprovide improved means for clamping the parts to be riveted during the riveting operationan'dto effect this result automatically as'the'ha'mmerIheadin'g toolmoves intooperativeiposition.

Other objects ofthe'invention' willbecome apparent'from the following specification, from the from, the claims reference may be had tofthe drawinawherein: l

' Figure l is: an elevational view showing a. riveting mechanism 1 constructed according to one Fig. 2 is a detailview of. thetvalve operating arrangement, showing the valve {in an open position; and

iFig B'ispa crosssectionalview on a larger ..xscale; taken: substantially along the 1 line -3 -3 of Figure 1.

Referring to Figure 1,-tneimach me illustrated includes a vertical column [I]; which is; suitably :anchored in a support ll disposed onna floor or fixed to the ;frame member in parallel relation.

otherlfoundation I2. A frame member 13 isvertically' slidable on the column I0 by means of arms"I4, -l5,'an d H); which havealigned aper- -tures receiving the column. Between the arms 15 and I6, acoil spring I! is disposed onthe column and this spring; at its upper end; abuts the arm it, while the lower end of. the spring rests on acollar l8anchoredfon the column. 7 This :collar is split at one point and has ears,

scre-wsj fih The extreme lefthand end of the extension 2311 and the lefthand end of the bracket :24 are laterally spaced from one another and slidably but closely embrace;the,key or gib 2B .tothe'column. l 0,;so that turning ofthe frame member about the column is preventedwhile still permitting vertical movement of the frame memben The keyor-gib 261s formedseparately from the frame and is removably securedrthereto by screws 21 so that in event of wear between these parts the key or rib may be replaced; or kthe bracket 24 1may be removed and suifi cient metal removed from that face thereof contacting Formoving the frame member|3 downwardly against the action-of the spring H, a foot treadle iii is; provided, which lis pivotally connected as indicated-at 29-to afloor plate 30; The.treadle intermediate its ends is pivotally connected.- as indicated at El t o'a fork 32 and the latter has a; stud portionat its upper end which is threaded intothe lower end ofaunion 33 until the union is tight'against the fork at the base ofthe' stud. In turn, the union is threaded onto the;1ower end or a tube;34. At its upper end the tuber-t4 .is-threaded into a similar union which in turn has the lower threaded end 35' of a connecting rod element 38threaded thereinto and, for positiVely holding the parts connected; a lock nut -.3l isprovidecl on the threaded end of the element. It maybe mentionedlthat the unions have a srnaller diameter internalthread for receiving the end of rod 36 and the threaded stud on :fork 32 and the tube is of such internal diameter as -tolallow extension of the rod and stud thereinto. I l

fllh rod 36 is preferably rlongitudinally resilient and while it-maytake any suitable formxtoattain,

this characteristic, in therparticularuform shown by way of illustration it is laterally bent into sinuous. form to provide resiliency in an axial direction, and at its upper end it is threaded into a coupling member-3B, in turn pivotally connected; as indicated at 39. to the fram member 13. A lock nut 40 on the upper endof the rod tfiholds the threaded parts tightly in position.

It will be apparent now that when the treadle For controlling operation of the air hammer, a valve i8 is carried by the latter and this valve in turn is opened and closed by a slidable pin 19. An

' .arm 89, pivotally connected as indicated at 8| to isdepressed, the frame member may be moved.

downwardly against the action of the spring I! and that in holding the treadle down, resiliency is provided through the element 36. v

For supporting a rivet to'be set, a member is provided which has an anvil 46 provided with arecess 42 for receiving the usual preformed head on one end of the rivet and it will be noted that the anvil face around the recess 42'is adapted tosupport part (it-and 49 to be riveted. The rivet is shown as" projecting above the part 48 as indicated at 50 and it is to be 7 understood that this projecting endis'to be upset and shaped to form ahead.

For forming this head on the rivet, and as best shown by Figure 3, a heading tool 52 is provided whichhas a cavity 53 in its'lower end face corresponding in shapeto the desired head. This heading toolhas a conical cavity 54 in'its upper end which receives'th'e tapered end '55 of a shaft member 56 so as to lock the parts for rotation through a taper lock. The shaft member 56 is journaled in a bearing 51 located in a vertically arranged opening 58 formed in an arm 59 on the frame =member l3 and in a similar bearing inasecondarm 60 shown by Figure 1.

Referring again to'the heading tool 52, a

clamping elementfor sleeve BI is slidable relative to the tool and is adapted to apply clamping pressure to the parts 48 and 49 during the riveting operation. This clamping element is slidably mounted in a barrel 62 threaded onto the arm as indicated at $3 and for retaining the element inthe barrel; Cooperating shoulders 64 and 65 are provided on*the barrel and sleeve respecma A spring 66 within the barrel normally urges the clamping element downwardly so as toapply the desired clampin pressure against the p'arts'48 and 4e. 7

Between the arms 59 and sea pulley ETis provided which has a hub portion 64 splined to "the shaft 'BGs that the'latter may be moved upwardly'an'd downwardly While being driven by '1 the pulley. Rotation of the pulley'is effected by means of a belt 58 trained about the pulley 67 and about a secondpulley 69 on a shaft 10 of a' mOtOY H; The motor is adjustably secured by a collar 12 to the column Ill-so that it'may be moved upwardly and downwardly to accommodate-it to any adjustment of the frame onthe column required byvariations in the'thickness of 'the'worlr or for other reasons. By mounting the motor on the "column in the'manner shown, itenables it' to b readily adjusted as described and relieves theframe of the weight thereof as would'be the case if the motor'was mounted on the frame and was movable therewith.

. Above the second-arm 60, the shaft 56 is pro- ,vided witha'coil spring 13 abutting at its lower end, the upper side of the arm 6 0 and at its 'upper end a collar" on the upper end of'the shaft. vAtits upper end the shaft abuts the lower end of ahammer 15 forming part of'an The air hammer is adjustably a bracket 82 fixed on the valve casing, is employed inside the valve returns the pin outwardly to close the valve. Movement of the arm 88 is effected by "a roller 84 on the end of an arm 85 which has I a split collar portion 86 adjustably secured on the column H] by a, clamping screw 81. The arm 8!] is so positioned with respect to the valve that .it provides an inclined cam surface and it follows that when the frame member [3 is moved downwardly, the valve pin 19 is moved inwardly to open the valve gradually and progressively and that when the frame member i3 is moved upwardly by the spring H,

a reverse action of the pin 19 occurs. It will be noted that the cam surface of the arm is sub stantially straight and its pivot point BI is so 10- cated'that although the opening movement of the valve'TB is relatively rapid during initial downward movement of the frame on the column during a riveting operation, the. opening of the valve is progressive and so gradual as to admit of closecontrol of the hammer operation. Additionally the arms 80 and are located substantially in a plane including the axes of both the column i9 and pin 19, so that no lateral bending force is applied to these arms in operatingthe valve, and they may, therefore, be made relatively light but rigid. A manually operated valvej9ll may be provided in an air supply line .soas to control the supply of air and it will be understood that this will allow for variable control of the hammer through variable control ofthe air supply. Likeadjusted.

I When the parts are adjusted as desired, movement of the treadle downwardly brings the frame member and air hammer thereon downwardly andat the same time the air control valve 18 Action of the hammer on 52,. through its connection with the rotating shaft 56, is turned so as to spin the metal and facilitate shaping of the head. During this opera- :tion' the clamping element 6| around the tool 52 clamps-the parts 48 and 49 against the'anvil at so as tohold them in position and clamped together. Byhaving resiliency in the treadle rod toth'rough'itssinuous form, it is easier to hold the treadle down and therev is less fatigue onthe operator. In other words, the operator may hold the treadle in its depressed position without that hammering or forced vibration of thetreadle'which would otherwise occur if there were no resiliency in the connection: At" the same time, the rod is sufiiciently rigid as to insure proper holding engagement of the tool 52 against the upper end of the rivet in order to'se cure the desired hammering'action.

Although only one form of the invention-has been described and illustrated in detail, it-will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the appended claims.

What is claimedisz l '1. A mechanism comprising a vertical column,

a frame member having three horizontally extending, vertically spaced arms having aligned frame member to prevent turning of the latter apertures receiving the column so that the frame member may slide vertically on the latter, a coil spring encirclin the column between the intermediate and one end arm and anchored to the column so as to urge the frame member along the column in one direction, means non-turnably about the column, an air hammer device movabl vertically with-the frame member, a rotary mounted on the column between the intermediate and other end arm and slidably engaging the frame member to prevent turning of the latter I about the column, an air hammer device movable vertically with the frame member, a rotary shaft rotatably mounted on the frame member and be ing vertically movable by the hammer, a motor vertically adjustable on the column, means opera tending, vertically spaced arms having aligned apertures receiving the column so that the frame member may slide vertically on the latter, a coil spring encircling the column between the intermediate and one end arm and anchored to the column so as to urge the frame member along the column in one direction, meansnon-turnably mounted on the column between the intermediate and other end arm and slidably engaging the frame member to prevent turning of the latter about the column, an air hammer device movable vertically with the frame member, a rotary shaft rotatably mounted on the frame member and being vertically movable by the hammer, a

motor vertically adjustable on the column, means operatively connecting the motor and shaft for rotating the latter while it is reciprocated, a valve for controlling the air hammer, means on the column for actuating the valve and depending for operation on movement of the frame member and hammer vertically of the column, and means for moving the frame member in the other direction along thecolumn.

3. In a riveting mechanism, in combination, a vertical column, a frame member movable vertically on the column, spring means for urging the frame member in one direction, foot operated means for moving said frame in the opposite direction, an air hammer movable with the frame. member, a valve fixed with respect to saidhammer and including an axiall movable valve stem arranged, with its axis substantially in a plane including the axis of said column, an oscillatable cam member pivotally mounted about a point fixed with respect to said valve and having one edge thereof bearing on said valve stem, and means including an arm fixed with respect to said column and arranged for engagement with said cam member during movement of said frame cured to said column and lying substantially on said column for operating said valve during movement of said frame member on said column.

4. A mechanism comprising a vertical column, a frame member having three horizontally extending, vertically spaced arms having aligned aper-. tures receiving the column so that the frame member may slide vertically on th latter, a coil spring encircling the column between the inter mediate and one end arm and anchored to the columnso as to urge the frame member along the column in one direction, means non-turnably mounted on the column between the intermediate shaft rotatably mounted on the frame member and being vertically movable by the hammer, a motor vertically adjustable on the column, means operatively connecting the motor and shaft for rotating thelatter while it is reciprocated, and means for moving the frame member in the other direction along the column, said cam member andsaid arm being arranged substantially in said plane including the axes of said valve stem and said column.

5. In a riveting mechanism, in combination,

a vertical column, a frame member movable vertically on the column, spring means for urging the frame member in one direction, foot-operated means for moving said fram in the opposite direction, an air hammer movable with the frame member, a valve fixed with respect to said hammer and including an axially movable valve stem arranged with its axis substantially in a plane A. including the axis of said column, an oscillatable cam member pivotally mounted about a point fixed with respect to said valve, said cam member having one edge thereof bearing on said valve stem and having an approximately straight opposite edge, and means including an arm fixed with respect to said column, a roller on said arm in engagement with said cam member during movement of said frame on said column for operating said valve during movement of said frame member on said column. 1

6. A mechanism comprising a vertical column, a frame member movable vertically on the column, spring means for urging the frame member in one direction, an air hammer movable with the frame member, a rotary shaft mounted on the frame member for vertical movement by the hammer, means for rotating the shaft as it is, moved a valve carried by the hammer for controlling its operation, cam means for opening thevalve gradually and progressively as the frame'member is moved in the other direction and for closing the valve progressively when the frame member is moved in said one direction by the spring means, said cam meanscomprising a cam lever mounted on said valve for piv-, otal movement in a plane substantially including the axis of said column, an arm rigidly sein said plane, and a roller carried by said arm in engagement with said cam lever, and means including a foot treadle for moving the frame member in said other direction.

'7; In a riveting machine, in combination, a base, a vertically extending column rigidly fixed at its lower end to said base, an anvil secured to said base, a frame vertically slidably mounted on said column, spring means constantly urging said frame in one direction on said column, foot opera ated means for moving said frame on said column in opposition to said spring means, an air hammer carried by said frame, a heading tool carried by said frame in axial alignment with said air hammer, and means for maintaining said tool in alignment with said anvil radially of said column comprising a gib removably secured to said frame, an arm secured to said column and having an end slidably engaging one side of said gib, and a bracket fixed to said arm and slidably engaging the opposite side of said gib.

HERMAN O. SCHLACK.

and other end arm and slidably engaging the

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