US2864525A - Riveting tool - Google Patents

Description

I Dec. 16, 1958 J. F. MHAMLIN ETAL RI-VETING TOOL 2 Sheets Sheet 1 Filed April 25, 1955 INVENTORS JERRY HAMLIN R0) M MAGNUSON RALPH 7K DAUGHERT."

By Q

ATTORNEY United States Patent RIVETING TOOL Jerry F. Hamlin, San Rafael, Roy M. Magnuson, Santa Clara County, and Ralph K. Daugherty, San Jose, Calif., assignors, by direct and mesne assignments, of one-sixth to said Jerry F. Hamlin, one-sixth to Bess E. Hamlin, one-sixth to Ralph M. Cuykendall, and one-sixth to Marie Cuykendall, all of San Francisco, one-sixth to Louise Newman, and one-sixth to Louis Newman, both of Oakland, Calif.

Application April 25, 1955, Serial No. 503,578

Claims. (Cl. 218-34) The present invention relates to riveting, and is concerned more particularly with a riveting tool for blind rivets having a riveting part or pin which must be driven home during the riveting operation, wherein the rivet center pin is assembled in the rivet bodyas a part of the riveting operation to effect upsetting of the rivet, and wherein smoothing off of the center pin at the end of the operation is also effected.

In using the type of blind rivets having center pins or rivet upsetting members, which remain as a part of the rivet after the riveting operation, it has been customary to pre-assemble the center pins on the rivet bodies at the factory so that each rivet is shipped as a complete unit ready for insertion in the members to be riveted, this unit including the rivet element per se, and the center pin assembled therein.

In the instant invention, there is disclosed a riveting tool whereby such blind rivets are provided with the rivet bodies and center pins separate and the two components are assembled automatically on the job, the center pin driven into the rivet body, and the head of the pin smoothed off, all as a part of the riveting operation. This invention is also concerned with a tool which is of an improved construction, economical to manufacture, and reliable in operation. Also, the tool of the present invention is designed for use with varying sizes of rivet assemblies, and accordingly embodies an automatic center pin feed, wherein center pins of different lengths are connected together or integrally formed as a stick, and the tool can be adjusted to the different spacings between the pins of the stick, so that accurate, reliable feeding of the rivet stick pin-by-pin will be effected.

The above and other objects of the invention will be apparent from the following description of a preferred embodiment of the invention, taken in conjunction with the accompanying drawings, in which:

Figure l is a side elevational view of the riveting tool.

Figure 2 is a longitudinal sectional view of the riveting tool, certain parts being shown in elevation, and others broken away.

Figure 3 is a fragmentary sectional view taken in a plane indicated by the line 3-3 in Figure 2.

Figure 4 is a sectional view, similar to Figure l, but showing the tool at the end of a feed stroke, and including a center pin stick for rivets therein.

Figure 5 is an enlarged sectional view of the chuck jaws before the start of a rivet feeding operation.

Figure 6 is a view similar to Figure 5 showing similar parts in an intermediate position during a feeding stroke.

Figure 7 is a view similar to Figures 5 and 6 showing the jaws at the end of a feed stroke with a center pin in projecting position and the jaws positioned to effect cut-off and driving thereof.

Figure 8 is a view similar to Figure 7 but illustrating one possible position of a center pin as the chuck jaws ice complete the cut-off of the center pin from a center pin stick, and at the start of upsetting of the rivet.

Figure 9 is a view similar to Figure 8 showing the condition of a rivet at the end of a riveting operation, with the chuck jaws in the position shown in Figures 4 and 7.

Figure 10 is a plan view of one of the chuck jaws.

Referring first to Figures 1 and 2, the riveting tool comprises generally a central body 10, a sleeve extension 11, and a hammer 12 carried by a tubular extension and guide 13 at the rear of the body 10, a suitable stopscrew 14 being provided for the hammer 12. The body 10 is shaped in general to form a handle. As seen more clearly in Figure 2, the body has a central bore 16 extending therethrough, from a reduced threaded end 17 on which the sleeve extension 11 is engaged to an internally threaded bore portion 18 of the body within which the tubular guide extension 13 is secured.

The sleeve extension 11 (Figures 2, 4 and 5) provides means for housing, and in part operating, a pair of identical cut-off and feeding chuck jaws 21, which are identical in construction, and only one of which will be described in detail. The chuck jaws 21 have a floating pivotal mounting in the tool, and are spring urged to the retracted position thereof illustrated in Figure 2, being responsive to internal pressure to move to an expanded projected position in the operation of feeding a center pin, as described in detail hereinafter. These jaws 21 have complementary concave drive faces 22, as shown, to fit a round head type of rivet. From the face 22 of a jaw, the outer jaw surface tapers backwardly and outwardly to an enlarged portion 21a providing a shoulder 21b engaging the end 25 of the sleeve 11. Within an enlarged bore 23 of the sleeve 11, the outer face of each chuck jaw is tapered inwardly to provide a cam surface 24 for engagement with the end edge of the bore 23, and this tapered portion or cam surface 24 being substantially frusto-conical in form corresponds to the circular contour of the sleeve 11. At its inner end, each jaw 21 is provided with an inward extension or pivot hook 26 which engages somewhat loosely in an annular groove 27 of a control member 28, said groove having one rounded corner. Opposite the hook 26, each jaw 21 has a rounded guide edge 29. The control member 28 is slidably engaged with an enlarged internal portion 30 of the sleeve 11, and a reduced rear end 31, which provides clearance for a spring 32 which seats at one end against a washer 33 within the extension sleeve 11, and its other end engages a washer 34, which is connected to the control member 28.

From the above description, it will be seen that the jaws 21 (Figures 2, 4 and 5) are spring urged to the position shown in Figure 2, but can be yieldably spread from this position to the position shown in Figure 4 by pressure against the internal cam surfaces 36 thereof, terminating in opposed mating knife edges 37.

It will be noted also that the guide member 28 has a central bore 38 which registers with the bore 16, and, as shown in Figure 4, forms therewith a magazine adapted to receive a center pin stick 41 consisting of a series of center pins 42 for the type of blind rivet that is seen most clearly in Figure 7, where the rivet body 45 is supplied separately from the center pin. In this type of rivet, shown as a roundhead rivet, the shank of the rivet body has four slots 43 in its end which is inserted through the blind hole or opening, providing four separated upsetting fingers 44. The center pin 42 which is tapered at one end 42a is adapted to be driven into the rivet body 45 to upset the riveting fingers 43 and thereby secure the rivet in place in the blind hole. The center pin stick shown is of the type described and claimed in the copending application of Ralph M. Daugherty, Serial No.

' '3 505,146, filed May 2, 1955 for Center Pin Stick, since abandoned.

Other types of sticks can be employed for providing the series of center ,pirrs,.such as, for example, a plain round or otherwise shaped rod. of material capable of being cut in two. Also, a series of separate center pins can be employed using any suitable means for pushing them through the magazine.

Means are provided for feeding the center pin stick along its receptacle or passage within the riveting tool, and this means can be adjusted to feed different lengths of center pins, as required for diflerent lengths of rivets. To provide feed means the body 10 has a radial machined slot 51 (Figures 3 and 4) which intersects its center bore 16, adjacent but spaced from the bore portion of biggest diameter, providing two guide surfaces 5r"; (Figures 2, 3 and 4) for a feed pawl 52, the surfaces 50 terminate in arcuate end portions 50a. The pawl 52 has a sliding pivotal, connection by means of a slot 54 therein on a pin 53 secured in the opposite walls ofa generally channelshaped lever or handle 61 which is pivoted to the body by respective pins 62. The pawl 52 is urged clockwise, as viewed in Figures 2 and 4, by a tension spring 58 connected between the pawl 52 and a bent ear 59 of the handle 61. In the inactive position of the pawl 52, shown in Figure 4, it is urged to place its feed tooth 52a out of active position, i. e. resting on one pair of arcuate slot surfaces 50a. In the active positionof the pawl, shown in Figure 2; the spring 58 urges the tail 56 of the pawl against a stop slide or feed gauge 57 therefor.

The stop slide 57 (Figures 2 and 4) has a plurality of positions in a selected one of which it is maintained by a pin 71, engaging either one of two holes 72 in the handle 61, and a guide rivet 73 which is secured in the slide 57 and engages a slot 74 in the handle 61. The stop slide 57 is sufficiently flexible so that the pin 71 which is riveted therein can be disengaged from one of the apertures 72 and moved along untilit snaps into the other aperture 72.

It will be noted that the feed pawl 52 (Figure 2) intersects the bore 16 sufliciently to seat within one of the grooves 41a of the center pin stick, to effect sliding of this center pin stick to the right as shown in Figure 4, and the extent of withdrawal or backward movement of the feed pawl 52 will determine whether a certain length group of pins is picked up thereby. With the pin 71 in one of the holes a selected length group of pins will be picked up, say the /8 and /8 length pins, and with the rivet 71 in the other hole 72, the longer group of pins will be picked up, for example, the A" or %,7 length pins.

In operation, the riveting tool is supplied with a center pin stick 41, which is placed in the central bore or magazine, this condition of the parts being illustrated in Figure 5, for example. Then the handle 61, which is grasped by the band also engaging the body 10, is moved from the position shown in Figure 2 to that shown in Figure 4, and during this movement the tapered end of the endmost center pin 42 will engage the inner cam surfaces 36 of the chuck jaws 21, and open t ese jaws, causing the guide member 28 to move to the right from the position shown in Figures 2 and 5 to that illustrated in Figure 6. As a result, the center pin is pushed between the jaws 21, which are spring urged together, and when the stick 41 reaches the position shown in Figure 7 and the jaws 21 reach the next adjacent groove 41a of the center pin stick, they will snap into the annular groove 41a as shown in Figure 7, engaging the straight shoulder 75 of the groove with one side of the face of the cutting teeth, and the tapered shoulder 42a with the other side of these teeth.

In this condition of the parts, a rivet body 45 is placed over the projecting center pin of the stick, as indicated in Figure 7, and this assembly of parts is inserted into a pair of members 80 and 81 which are to be riveted together from one side thereof. Then the hammer 12 is grasped in the other hand and sharply impacted repeatedly against the body member 10, causing a driving of the sleeve extension 11 up over thecam surfaces 24 of the respective chuck jaws 21, thus tending to force the jaws 21 together to cut the stick 41 at the same time that the lengthwise impact is transmitted through the riveting tool to the end center pin 42 to drive it into the body of the rivet. When the center pin 42' engages the tapered inner edges of the upsetting portions 43 of the rivet body 42, and resistance is encountered by the center pin in its travel, the jaws 21 will begin to bite together as they are forced back into the tool extension 11. Depending upon the hardness of the material of the center pin stick, and the resistance of the construction of the particular rivet being used, at some time during the riveting operation the endmost center pin will be clipped or out free from the center pin stick, as seen in Figure 8. The tool in effect shears off the center pin as it is being assembled in the rivet, and then is in a closed position to drive it on into the rivet, upsetting the rivet at the same time. After the cndmost center pin, which is being driven home, has been cut free from the tool, there is certain relative rotational movement that will occur during the driving operation, so that the cavity formed in the end of the jaws 21, which matches the spherical shape of the head of the rivet body 45, will smooth off the cut end of the center pin which is being driven home, and at the end of the operation a smooth appearing rivet head will be provided.

While we have described a preferred method of carrying out our invention, and a preferred structural embodiment of the invention, it should be apparent that the invention is capable of variation both as to method and as to structure from the particular forms described so that the scope thereof should be limited only by the proper scope of the claims appended hereto.

We claim:

1. In a tool for assembling and installing blind rivets of a type employing a rivet upsetting center pin adapted to be driven into and left in place in the body of the rivet, a tubular tool body having passage means to receive a center pin, a mounting sleeve slidably mounted in said tubular body adjacent one end thereof, spring means urging said mounting sleeve inwardly from said adjacent end, said mounting sleeve having groove means therein extending transversely of the length thereof, a pair of chuck jaws having portions engaging said groove means for rocking movement of the jaws therein, said jaws having jaw portions adapted to open to pass a center pin to a position with the center pin in external driving relation with respect to said jaws, whereby impact against said jaws will drive said pin into the rivet body associated therewith, said body and said jaws being connected to transmit driving forces therebetween.

2. In a tool for assembling and installing blind rivets of a type employing a rivet upsetting center pin adapted to be driven into and left in place in the body of the rivet, an elongated tool body having a bore therein to receive center pin means, means forming a radial slot partially intersecting said here, a handle pivotally mounted on said body, a feed pawl pivotally mounted on said handle and having a feed nose engaged in said radial groove and entering said bore, and spring means urging said feed pawl in a direction to engage said center pin means in said bore, whereby rocking movement of said handle with respect to said body causes feeding movement of said feed pawl and progression of said center pin means along said bore.

3. In a tool for assembling and installing blind rivets of a type employing a rivet upsetting center pin driven into and left in place in the body of the rivet, an elongated tool body having a bore therein to receive center pin means, means forming a radial slot partially intersecting said bore, a handle pivotally mounted on said body, a feed pawl pivotally mounted on said handle and having a feed nose engaged in said radial groove and entering said bore, spring means urging said feed pawl in a direction to engage said center pin means in said bore, whereby rocking movement of said handle with respect to said body causes feeding movement of said feed pawl and progression of said center pin means along said bore, and means for controlling the extent of movement of said feed pawl, including an adjustable member forming a stop therefor.

4. In a tool for assembling and installing blind rivets of a type employing a rivet upsetting center pin adapted to be driven into and left in place in the body of the rivet, an elongated tool body having a bore therein to receive center pin means, means forming a radial slot partially intersecting said bore, a handle pivotally mounted on said body and having a feed nose engaged iu said radial groove and entering said bore, spring means urging said feed pawl in a direction to engage said center pin means in said groove, whereby rocking movement of said handle with respect to said body causes feeding movement of said feed pawl and progression of said center pin means along said bore, and pin responsive jaws on said body spring urged to retracted closed position, said jaws having inner cam surfaces for engagement by said pin means, and being responsive to feeding movement of said pin means to allow feeding of a pin therethrough and then operating to close under the urgency of an impact against said jaws to sever the pin and to drive it into the rivet body.

5. In a tool for assembling and installing blind rivets of a type employing a rivet upsetting center pin driven into and left in place in the body of the rivet, an elongated tool body having a bore therein to receive center pin means, means forming an opening partially intersecting said bore, feed means positioned in said last mentioned means for engaging and causing feeding movement of said center pin means along said here, and pin responsive jaw means on said tool body, said jaw means being spring urged-to retracted partially closed position, said jaws having opposed knife edges and inner cam surfaces adjacent said edges for engagement by said pin means and being responsive to feeding movement of said pin means to spread said jaw means and thereby allow feeding of a pin therethrough and, said tool having means then operating to farther close said jaw means under the urgency of an impact delivered to said jaw means through the forward portion of said tool body to sever the pin and to drive said pin into the rivet body.

6. In a riveting tool, a body having a longitudinal bore therein, a center pin in said bore, a sleeve extension mounted on one end of said body, a pair of chuck jaws movably mounted in said sleeve extension, a generally cylindrical carrier slidably mounted in said sleeve extension and having an annular groove, hook means on said jaws engaging said groove whereby said carrier and said jaws are connected to move back and forth in said sleeve extension together, said jaws including outer cam surfaces engaging said sleeve extension for controlling opening and closing movement thereof and pin responsive inner cam surfaces, impact means at other end of said body, and pin feed means.

7. A riveting tool for installing blind rivets by driving a center pin into each of said rivets from the head end thereof and cutting off said pin, said tool comprising a sturdy elongated body structure providing a longitudinal extending passage for a rivet pin stick having a plurality of notches uniformly spaced therealong and dividing said stick into a plurality of said pins, a jaw structure at one end of said body structure including openable jaws, resilient means resiliently urging said jaws toward a closed jposition, said jaws having cooperating cutting edges thereon directed toward each other and movable into contact with each other to cut a pin from said stick, feeding meansengaging in said stick notches operable to feed one of such pins through said jaws so that said jaws partly close under the urgency of said resilient means with said cutting edges in one of said notches, said body structure being provided with an unobstructed impactreceiving surface rearwardly of the jaw-structure-end of said body structure and having means engaging said jaws to farther close said jaws when impacts are applied to said body structure in a direction longitudinally through said body structure toward said jaws so that said impacts may be employed simultaneously to drive said one pin into a rivet and to cut 01f said one pin.

8. A riveting tool as defined in claim 7 in which said tool has a slidable hammer member on said body structure for producing said impacts.

9. A riveting tool as defined in claim 7 in which said jaws comprise elongated members extending longitudinally from the body structure of said tool, said jaws having cam portions engaged by said portions of said body structure to force said jaws toward said closed position.

10. A riveting tool as defined in claim 7 in which said jaws comprise elongated members extending longitudinally of said tool, said jaws having one of their ends positioned outside said body structure and having said cutting edges on said ends, said jaws also having cam portions intermediate their ends engaged by said body structure to force said jaws toward closed position, the other ends of said jaws being poistioned within said body structure.

References Cited in the file of this patent UNITED STATES PATENTS 1,174,937 Merrick Mar. 7, 1916 2,389,479 Austin Nov. 20, 1945 2,400,354 Jensen May 14, 1946 2,416,474 Frank Feb. 25, 1947 2,421,474 Alter June 3, 1947 2,595,551 Springate May 6, 1 952 2,622,781 Polson Dec. 23, 1952 FOREIGN PATENTS 122,504 Australia Oct. 15, 1946 371,817 Italy June 5, 1939

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