US3048296A

US3048296A - Hand-operated tool for riveting by means of tubular rivets receiving a shank

Info

Publication number: US3048296A
Application number: US634192A
Authority: US
Inventors: Heidenwolf Hermann
Original assignee: HANS GEORG BIERMANN
Current assignee: HANS GEORG BIERMANN
Priority date: 1956-01-17
Filing date: 1957-01-15
Publication date: 1962-08-07
Anticipated expiration: 1979-08-07

Description

Aug. 7, 1962 HEID WOLF 3,043,296

HAND-OPERATE 00L F0 IVETI BY MEANS OF TUBULAR RIVETS RECEIVIN SHANK Filed Jan. 15, 1957 2 Sheets-Sheet l INVENTOR HERMANN HEIDENWOLF ATTORNEY.

7, 1962 H. HEIDENWOLF 3,048,296

HAND-OPERATED TOOL FOR RIVETING BY MEANS OF TUBULAR RIVETS RECEIVING A SHANK Filed Jan. 15. 1957 2 Sheets-Sheet 2 FIG, 3.

FIG. 2.

INVENTOR HERMANN HEIDENWOLF WWW ATTORNEY.

United States 3,048,296 Patented Aug. 7, 1962 [ice 3048296 HAND-OPERATED Tool: FOR RIVETING BY g/IEANS F TUBULAR RIVETS RECEIVING A The present invention relatw to a hand-operated riveting tool for performing a riveting operationon a tubular rivet having a shank, the latter being received in and extending beyond one end of the tubular rivet.

It is known to form riveted connections of a plurality of work pieces, one face of which is not easily accessible or not accessible at all. In such situations blind rivets are used which consist of a tubular rivet and of a shark or mandrel received in the tubular rivet. The rivet-ing process is brought about by pulling the shank through the tubular rivet. pulling the shank portion extending from the tubular rivet from the accessible side of the work pieces, simultaneously upsetting the tubular rivet.

It is one object of the present invention to provide a manually operated riveting tool for performing a riveting operation on a tubular rivet which receives a shank extending beyond one end of the tubular rivet, which tool permits a completely automatic operation of breaking off and ejecting the extending shank portion and which tool may be adjusted for a plurality of rivet sizes.

It is another object of the present invention to provide a manually operated riveting tool of the type set forth above which comprises two tool arms, one of which is provided at one end thereof with spaced, substantially parallel walls to define a housing. One end of the other tool arm moves in the housing and has a longitudinal slot. A bolt is disposed crosswise between and secured tov the spaced walls and through the slot of the other tool arm, to constitute the pivot between the tool arms and permitting, due to the longitudinal slot, relative angular movement, as well as limited longitudinal movement between the tool arms. A load arm is pivotally secured to the other tool arm, and means are disposed in the housing which moves the load arm parallel to itself in the housing. The load .arm forms jointly with a clamping jaw a chuck which grips the shank portion extending from the tubular rivet and brings about the riveting operation upon moving the other, free ends of the tool arms towards each other.

It is also another object of the present invention to provide a manually operated riveting tool of the type set forth above, wherein the load arm has a lower pivot means and an upper pivot means, the upper pivot means mounting the load arm pivotally on the other tool arm and both pivot means are freely movable in the housing. Two pivot bolts are spaced apart from each other and extend crosswise of the spaced walls of the housing, and lower and upper cross links connect each of the pivot means with the corresponding pivot bolts, so that the load arm together with both cross links and with a connecting link, connecting the lower pivot bolt with the other tool arm, form a parallelogram causing a movement of the load This is brought about by gripping and arm which is parallel to itself, upon moving the free ends of the tool arms towards each other.

It is yet another object of the present invention to provide a manually operated riveting tool of the type set forth above, which includes means for biasing the clamping jaw on the load arm.

It is a further object of the present invention to provide a manually operated riveting tool of the type set forth above, wherein the load arm is equipped with a slot opening at the bottom periphery thereof, to provide resiliency therein.

It is also an object of the present invention to provide a manually operated riveting tool of the type set forth above, which includes a spring secured to the other tool arm and engaging the clamping jaw in order to bias the latter.

With these and other objects in view, which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawings, in which:

FIGURE 1 is a front elevation of the tool at the start of the operation, partly in section;

FIG. 2 is a section along the lines 2-2 of FIG. 1;

FIG. 3 is a section along the lines 3-3 of FIG. 1;

FIG. 4 is a section along the lines 44 of FIG. 1; and

FIG. 5 is a front elevation similar to that of FIG. 1, partly in section, the tool arms being shown in their position near the end of the riveting operation.

Referring now to the drawings, and in particular to FIGS. 1 to 4, the combined tubular rivet comprises a wedging head 1, a drawing shank 2 having a notch 3 intermediate its ends to mark the breaking point of the shank portion extending from the tubular rivet 4 which receives the shank 2. The tubular rivet 4 is shown in FIG. 1, in its starting position, inserted in'corresponding bores of the work pieces to be riveted prior to the upsetting of the tubular member 4.

' The drawing shank 2, in the use of the tool, extends through a bore of a supporting member 6' mounted on the tool arm 14. The drawing shank 2 is intended to be secured to a load arm 5 which forms jointly with a clamping jaw 6 a chuck.

In order to bring about the clamping action as a function of the drawing force exerted upon the shank 2, the clamping jaw is obliquely guided in the load arm 5 and is wedged to the shank 2 by means of a spring blade 7, whereby the clamping jaw, moving along the guiding face of the load arm 5, acts as a conventional wedge clamp. The guide face is formed in a bow-shaped, forked outer end of the load arm 5 (FIG. 2). V

The manually operated riveting tool for performing the riveting operation comprises two tool arms 14 and substantially parallel walls 15 and 15 (FIGS. 3 and 4).

to define a second housing moving in the first mentioned housing of the tool arm 14. The tool arm 15 has a longitudinal slot 16 in the

opposite walls

15 and 15 through which the bolt 10 extends, so that the latter operates as a pivot between the

tool arms

14 and 15, permitting relative angular movement, as well as limited longitudinal movement due to the slot 16 in the tool arm 15.

An upper link 9 connects the upper pivot bolt 10 With the upper end of the load arm by means of a pivot means 8 formed, for instance, by a pin disposed crosswise between the

walls

15 and 15 of the tool arm 15, while a lower link 12 connects the lower pivot bolt 13 with the lower end of the load arm 5 by means of a lower pivot means 11 formed, for instance, by a pin. The lower link 12 is of U-cross section (FIG. 2), receiving the load arm 5 between its leg members, and the lower pivot means 11 is disposed crosswise between and secured to the leg members of the lower link 12 and extends through the load arm 5, the base of the U of the lower pivot means 12 being arranged at the end thereof remote from the load arm 5.

In addition a connecting link 18 is pivotally secured at one of its ends to the lower pivot bolt 13 and, thereby, to the tool arm 14 and is also pivotally secured at the other of its ends to the tool arm 15 by means of a bolt 11 disposed crosswise between and secured to the opposite walls 15' and 15 The upper link 9, the load arm 5, the lower link 12 and the connecting link 18 form substantially a parallelogram having the pivot bolts and 13 as fixed corner points, so that the load arm 5 moves substantially parallel to itself upon moving the tool arms 14 and towards each other, while the links 9 and 12 swing about the fixed pivot bolts 10 and 13. Due to the connection of the tool arm 15 with the fixed pivot bolt 13 by means of the connecting link 18, the slot 16 is provided in the opposite walls 15' and 15 so that a relative angular and a required limited longitudinal movement between the

tool arms

14 and 15 is made possible.

Referring now again to the drawings, and in particular to FIG. 5, the riveting tool is shown in a position prior to the final stage of the riveting operation, which terminates with the breaking-off of the extension of the shank 2.

Since rivets ofdifferent lengths are required for work pieces of varying thickness, accordingly the stroke for clinching the rivet will vary in accommodation to the length of the rivet. In order to bring about the required variation of' the clinching stroke, an abutment member 21 is adjustably disposed in the bottom wall of the housing; formed; by the tool arm 14. The abutment member 21 has an inclined inner face complementary to the inclination of the lower face of the load arm 5. Upon adjusting the abutment member 21 by movement thereof along said bottom wall of the tool arm 14, the load arm 5 will assume a starting position for the clinching stroke of the rivet which is at a higher or lower level, depending upon the position of the abutment member 21 relative to said bottom wall, since the load arm 5 engages the abutment member 21 in its starting position. By this arrangement the break-off point of the shank extension is always reached at a point of application of the greatest force upon the shank 2.

The riveting tool, designed in accordance with the present invention, includes also means for automatically clamping the shank extension in the chuck formed in combination with the load arm 5, as well as for automatically ejecting the broken-otf shank extension upon termination of the riveting operation. The means for this end cornprises a slot 19 disposed and extending upwardly from the bottom face of the load arm 5, so that the shank gripping portion of the load arm 5 has a certain degree of resiliency, the modulus of which is responsive to the length of the slot 19. The shank gripping portion of the load arm 5 is, thus, capable of yielding resiliently during the riveting operation, so that after reaching the. breaking point for the extending shank portion and releasing the

tool arms

14 and 15 to their original position by the action of the spring 20 disposed therebetween, and, thereby, moving the clamping jaw by the spring 7 along the inclined face of the load arm 5 into a non-clamping position, the broken-ofi' shank portion is ejected through an upper opening in the housing of the tool arm 14, as indicated by an arrow in FIG. 5, due to the sudden return movement of the shank gripping portion of the load arm 5 into its original position.

In order to assure or ease the release and ejection of the broken-off shank portion, the gripping face of the clamping jaw 6 is equipped with grooves disposed obliquely (not shown) and extending in the direction of the ejection.

The riveting tool, designed in accordance with the present invention, permits for the first time, the use of the same tool for the working of tubular rivets of different diameters and of different lengths.

While I have disclosed one embodiment of the present invention, it is to be understood that this embodiment is given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and the claims.

I claim:

1. A manually operated riveting tool for performing a riveting operation on a tubular rivet having a shank received therein and extending beyond one end thereof, said tool comprising:

two tool arms angularly movable relative to each other,

one of said tool arms being provided with spaced walls to define a housing formed at one end thereof,

a load arm carrying a clamping jaw to form jointly therewith a chuck,

said chuck being adapted to engage the free end of said shank,

said load arm being disposed within said housing and having a lower pivot means and an upper pivot means,

said upper pivot means mounting said load arm pivotally on the other of said tool arms,

and both of said pivot means being freely movable in said housing,

two pivot bolts spaced apart from each other and extending crosswise through said spaced walls of said housing,

a lower cross link connecting said lower pivot means with one of said pivot bolts,

and an upper cross link connecting said upper pivot means with the other of said pivot bolts,

and a connecting link,

one end of the latter being pivotally securd to said one of said pivot bolts and the other end of said connecting link pivotally secured to said other of said tool arms,

said load arm together with said lower and upper cross linksand with said connecting link forming a parallelogram,

and said lower and upper cross links and said connecting link being pivotable about said pivot bolts, to provide the pulling stroke of said chuck within said housing.

2. The tool, as set forth in claim 1,

which includes means for biasing said clamping jaw on. said, load arm.

3. The tool, as set forth in claim 1,

wherein said load arm is formed with a slot opening at the periphery of said load arm, to provide a resiliency therein,

and an abutment means is disposed in said housing and engages the lower face of said load arm, to determine the starting point of the pulling stroke of said load arm.

4. The tool, as set forth in claim 3,

which includes means for adjustment of said abutment means.

5. The tool, as set forth in claim 1,

which includes a spring secured to said other of said 76, tool arms and engaging said clamping jaw, 1,903,034 in order to bias the latter in a direction opposite to that 1,908,175 in which said shank is drawn during said pulling 2,623,729 stroke. 6

References Cited in the file of this patent 5 382 UNITED STATES PATENTS 3071707 254,411 Turner et a1. Feb. 28, 1882 88,268

6 Front May 1, 18'83 Eurit Mar. 28, 1933 Osborne May 9, 1933 Selby Dec. 30, 1952 FOREIGN PATENTS Great Britain Jan. 7, 1942 Switzerland Aug. 16, 1955 Norway Oct. 29, 1956