US2899852A - burgess - Google Patents

Description

Aug. 18, 1959 B. 1.. BURGESS 2,899,352

TOOL FOR SUPPORTING AND UPSETTING RIVETS Filed May 6, 1955 2 Sheets-Sheet 1 Mll- 41 INVENTOR Q, 1/ m m), M. 2am, y m

ATTORNEYS B. L. BURGESS TOOL FOR SUPPORTING AND UPSETTING RIVETS Aug. 18, 1959 2 Sheets-Sheet 2 I Filed May 6, 1955 INVENTOR M LZ M/ ray/0mm 41 WM Mm ATTORNEYS United States Patent TOOL FOR SUPPORTING AND UPSETTING RIVETS Bernard Lee Burgess, Wheeling, W. Va.

Application May 6, 1955, Serial No. 506,425

3 Claims. (Cl. 78-53.5)

This invention relates to the art of riveting and is directed more particularly to a tool that is adapted to support a rivet during the upsetting operation.

In the riveting of large and unwieldly articles, such as the brake bands of heavy earth-moving equipment, for example, the use of rivet supporting tools has already been suggested. Almost without exception, such tools have been of the type which bear against and apply pressure to only one end of the rivet and have thus been known as rivet buckers." The support necessary to oppose this pressure has been obtained either by anchoring the end of the tool remote from the rivet against a stationary object or by providing jaws or other means for gripping the workpiece. Either of such arrangements is subject to certain disadvantages. In the first case, a fixed abutment is not always available; in the second case, it is frequently undesirable to have clamping pressure applied directly to the workpiece as this tends to deform or otherwise damage the workpiece.

It is therefore the primary object of the present invention to provide a holder or clamp for a rivet during the upsetting or clinching operation in which the clamping pressure is directed against the head end of the rivets.

Another object of the invention is to provide a rivet holder in which an element contacting one end of the rivet is rockable to and from clamping position and either this element or the element contacting the other end of the rivet is axially movable to permit delivery to the rivet of an upsetting impact.

A further object of the invention is to provide a rivet holder in which clamping action is effected through a simple system of levers which permits the application of the necessary pressure to the rivet with a minimum of exertion on the part of an operator.

A still further object of the invention is to provide a rivet holder which is adapted for a wide latitude of adjustment to accommodate workpieces of varying thick- :ness.

An additional object of the invention is to provide a trivet holder which is simple in design, rugged in construction, and virtually fail-safe in operation.

Other objects and advantages of the invention will be apparent from the following detailed description when considered in connection with the accompanying drawings in which:

Figure 1 is a side elevation of the holder of the present invention with the workpiece indicated in dotted lines;

Figure 2 is a plan View looking down on Figure 1;

Figure 3 is a longitudinal cross-section taken along line 3-3 of Figure 1;

Figure 4 is a sectional view taken along line 4-4 of Figure 3;

Figure 5 is a view taken transversely of the holder of Figure 1 along line 5-5 of Figure 1;

Figure 6 is a transverse section taken along line 6-6 of Figure 1;

2,899,852 Patented Aug. 18, 1959 Figure 7 is a side elevation of a modified form of the invention with the impact device indicated in dotted lines;

Figure 8 is a plan view looking down on Figure 7;

Figure 9 is a partial transverse section taken along line 9-9 of Figure 7; and

Figure 10 is a transverse section taken along line 10-10 of Figure 7.

Broadly speaking, the present invention contemplates an element for contacting the headed end of the rivet, which element is rigidly supported by a frame member, and another element for contacting the other end of the rivet in opposition to the first element, the latter element being pivotably mounted on such frame member and rockable toward and away from the first element. At least one of the elements is axially adjustable with respect to its mounting and one of the elements is adapted for limited sliding movement relative to its mounting in the direction of the other elements. To operate the rockable element, a toggle lever is provided, by means of which the rockable element may be moved to and locked in a position clamping the rivet against the rigidly supported element.

Reference is now made to the drawings for specific illustrative embodiments of the invention, and in the form of the invention shown in Figures 1 through 6 the numeral 11 designates a rigid frame member, which may be of generally U-shape, having a base member 12 and dependent legs 13 and 14.

As can be observed from these figures, it is not necessary that the base 12 be entirely straight throughout its length since it can be bent or offset in any desired fashion, as at 12a, for example. For ease in operation and transportation of the tool, a handle 15 may be secured to the terminal end of one of the legs, for example, leg 14. The other leg 13 rigidly carries at its upper end a sleeve 16 which is slidably penetrated by a short rod 17. At its inner end, rod 17 is generally flat or otherwise shaped for engagement with the unheaded end of a rivet R, as at 18 while at its outer end the rod is provided with a collar or disc-like enlargement 19. A compression spring 20 encircles rod 17, bearing at one end against the outer face of sleeve 16 and at the other end against the inner face of collar 19, rod 17 thus being biased in a direction outwardly of the frame. v

Rod 17 is prevented from withdrawing from sleeve 16 under the action of spring 20 by means of a pin 21 projecting radially therefrom and adapted to contact the wall of sleeve 16. It is desirable that the rod may be placed in a plurality of positions spaced axially from the inner face of sleeve 16 and, to this end, a deep notch 22 is cut in the wall of sleeve 16 and the sides of the notch are formed in a series of steps 23, any one of which is adapted to be engaged by pin 21. Notch 22 also permits the end of the rivet that is to be upset to be in the unobstructed view of the operator at all times, facilitating alignment of the rivet-contacting element of the holder with the rivet.

Pivotally connected to the base 12 of frame 11 intermediate the upstanding legs 13 and 14 is one end of a rock link 25 which is preferably constructed of two spaced parallel links 25a straddling base 12 and connected thereto by means of a pin 26. At the end of rock link 25 remote from base 12 is a sleeve 27 which is tapped for the reception of a short threaded shaft 28. The inner end of shaft 28 is reduced in diameter to provide an anvil 29 for contacting the headed end of rivet R in approximate axial alignment with rod 17.

It is apparent that rivet R is adapted to be heldjbetween anvil 29 and the flat inner end 18 of rod 17 when the anvil carrying link 25 is rocked toward rod 17 and in order to effect this movement a toggle lever, generally designated 31, is employed. Toggle lever 31 includes a handle lever 32 .pivotally connected intermediate its length but somewhat nearer itsfinner end "to "leg 14 by a pivot pin'33, and a short link '34. The latter is formed at its outer end with a yoke or clevis 35, in which the inner endpfhandlelever 32 is pivotally secured by pivot pin 36, and at its inner end with 'a lug 37, which fits "between and is connected by a pivot pin 38 to links 25a at a point intermediate the'ends thereof. To prevent further movement of handle lever 32 when the toggle is in alignment or is in dead center (with the pivot axes represented by pins 33, 36 and 38 in a substantially straight line), -a stop finger39 is provided to engage handle 15. A more balanced type -'of support for the pivotal connection of handle lever 32 to leg 14maybe obtained by forming in leg 14 a -slot'40 through which theinner end of handle lever 32 extends.

'The operation of this form of the invention will be readily understood. For adjusting the workpiece W with rivet R in place therein is positioned between leg 13 and rock link 25 with the rivet in approximate alignment with "anvil 29 and rod 17, the head being in contact with anvil '29. Rod 17 is positioned in sleeve 16 by selective engagementof pinll with any of the steps 23 as governed by the length of the rivet, that is, thesaid rod 17 is appropriately positioned and shaft 28 is rotated in the threads of sleeve 27 until the clearance between anvil 29 and fiat end 18 :of rod 17,'when the work is in clamped position, is :somewhat less than the actual initial length of rivet. This adjustment of the anvil is made independence upon the length of rivet selected with the toggle in straight alignment, thatisywith ithe toggle at the limit of its move- .ment as dictated bystop 39. Next, for use of the tool, handle 15 .and handle-.lever32 are grasped and brought itoward each other '.until .the toggle is in straight align- .mentand pressure is applied against the head end of the ,IiVfit and through said head to'the work. The unbalanced location of the :fulcrum axis 36 of the toggle lever, of 'zcourse,provides a mechanical advantage as does the positioning of the pivotal connection betweenshort link 34 'iBIIdIOC-k link 25 intermediate the ends of the latter, the -result being thatthe movement o'frockilink 25 to clamp- .ingposition of the work andrivet can be obtained with *a :very small degree of manual effort. When linkZS is PI'OCkCd toward the workpiece, the inner face of sleeve '16 bears against and supports one surface of the workpiece while clamping pressure is applied to the other surface .ofthe workpiece through the rivet head. When the rivet zand work'areclamped between anvil 29 and sleeve 16, the -impact necessary to upset or clinch its end may be applied ;to the'disc 19 at the outer end of.rod.i17 by meansof a ,hammer, ,"pneumatic impact device, or other means. Re- .lease of .the toggle rocks link 25 and anvil 29 away from red 17 so that the riveted workpiece may be removed from the holder. Additional clearance betweenthe ends of the anvil 29 and rod 17 may be-obtained by moving ,pin 21 against one of the steps 23 that is spaced a greater distance from the inner end of sleeve 16 than the step initially engaged by the pin.

In Figures 7 through there is illustrated an alternative form of the invention in which a pneumatic or electrical impact device is employed as an operative com- ;ponent of the invention, and in this form, prime designations will be used for corresponding elements. Accord- :ing to this modification, the anvil carrying shaft 28 is .received in threaded fashion by a tapped sleeve 27' .supported at the terminal end of rigid leg 13 while the upper end of .rock link 25 is provided with a generally semi-circular guide 50, Figs. 8 and 9, which is adapted to support therein and guide the movable end or ham- .mer H of an impact device I. The upper end of-the leg .14 carriesan'outwardly directed extension 51 of T-shaped ,cross section which-supports a'-slide 52. The extent which slide 52 may move back and forth 011 cxt n is 57 are provided at the upper end of rock leg 25.

determined by the location-of pin 53 in a spaced series of holes 54 provided in the web of extension 51, the forward movement of the slide being'limited by engagement with arm 14. Upstanding from slide 52 is a clamping sleeve 55 which is adapted to encompass the barrel I of the impact device and tightly embrace the same by suitable adjustment of a clamping screw 56.

The operation of the modified form of the invention does not differ materially from that previously described as to Figs. 1 to 7 and will not be repeated. The slide 52, of course, permits the hammer H of the impact device to follow the movement of the rock leg 25 to the right, Fig. 7, even though the barrel is tightly secured by the clamping sleeve 55 to permit the hammer H to contact the rivet, and the extend of rearward movement of the slide is selected to provide for hammer H to retreat sufficiently rearward of the front ends of extensions 57 for a particular throw of the toggle lever 31' as one preferred way of operating the tool. In this alternative arrangement, the rivet and work, when the toggle is straight is held between the lever 25 at the unheaded end, and the anvil 29, at the other end, the force of the impact device being directly opposed by' the rigidly supported anvil. By the hammer H following the movement of the rock leg 25', the purpose is served that the hammer H will contact the rivet positioned to set the rivet in the workpiece.

As in thecase of the initiallydescribed embodimentof the invention, the modified form is adapted to exertclamp ing pressure directly against the parts of the workpiece. For this purpose, spaced forwardly directed extensions The inner edges of these extensions can bear directly against the workpiece when leg 25 is rocked so that the inner extension edges contact the workpiece while the end .of hammer H, when not operating, is slightly removed "from the unheaded end of the rivet.

From the foregoing detaileddescription, it willbe seen that I have provided one form of rivet holder in which the rivet and workpiece are clamped between an impact delivering element and a rigidly secured element, one of these elements being rockable to permit positioning of the holder on the workpiece and to permit application of clamping force to the rivet and the workpiece. Theconstruction of these holders is simple, a minimum'of moving parts being employed, and any of these parts maybe removed and replaced with ease and'facility.

It will be understood by those skilled in the artthat the invention is not limited to 'the details of the particular embodiments illustrated and described :but :only by the scope of the claimshereunto appended.

Having thus described ,-my invention, that which is claimed is:

11. A toolfor upsetting rivets comprising a'frarnememher having a base and three legs upstanding from -Said base, the firstand secondlegs being integrallyconnected to the ends of said base and the third leg being'pivotally connected to said base intermediate said ends andextending upwardlytherefrom between said first and second legs, an operating lever fulcrumed intermediate its ends on-said first integral leg, ashort-link pivotally connected at one of its ends to an end of said lever and atthe other of its'ends to said pivotable third leg intermediate its ends,

said lever'and said short link constituting a toggle for rocking said pivotable third leg toward and to pull the pivotable third leg away from saidsecond integral leg, an anvil onisaid secondintegral leg for contactingonesend of a rivet, said anvil and said second integral legin-which theanvil is mounted having cooperating means to adjust the anvil in said second integral leg, a clamping sleeve *adjustably secured onthe first integral leg andadapted to receive therein an elongated rivet upsetting meanswit ,a hammer forcontacting the other end of said rivet-supported on said tool, said upsetting means beingan axial alignment with the anvil, the adjustability of the anvil permitting work of various thicknesses to be clamped intermediate said anvil and said pivotable third leg so that said pivotable third leg and said second integral leg are generally parallel with each other and said anvil and rivet upsetting means are in axial alignment, and said third leg having means in the end opposite its pivotal connection to the base to support and guide the hammer of the upsetting means.

2. A tool according to claim 1, in which the first integral leg has an outwardly directed T-shaped extension in cross-section below the axial alignment of the anvil and the rivet upsetting means to support the clamping sleeve to slide thereon, a plurality of holes being provided in the T-shaped portion to receive a pin against which the sleeve may abut in adjusted position.

3. A tool according to claim 1, in which the first integral leg has a T-shaped portion extending parallel to the base below the axial alignment of the anvil and the rivet upsetting means, and in which a slide member is provided on which the clamping sleeve is secured and which is slidable on the T-shaped portion.

References Cited in the file of this patent UNITED STATES PATENTS 250,121 Xavery Nov. 29, 1881 547,142 Cummings Oct. 1, 1895 669,965 Jamison March 12, 1901 1,143,821 Frazier June 22, 1915 1,863,901 Gormley June 21, 1932 1,933,731 Hanna Nov. 7, 1933 2,045,333 Pipes June 23, 1936 2,179,900 Sheane Nov. 14, 1939

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