CA1237574A - Punch anvils for sheet fastening systems - Google Patents
Punch anvils for sheet fastening systemsInfo
- Publication number
- CA1237574A CA1237574A CA000536721A CA536721A CA1237574A CA 1237574 A CA1237574 A CA 1237574A CA 000536721 A CA000536721 A CA 000536721A CA 536721 A CA536721 A CA 536721A CA 1237574 A CA1237574 A CA 1237574A
- Authority
- CA
- Canada
- Prior art keywords
- punch
- anvil
- jaw
- shoulder
- body portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
- B21D39/031—Joining superposed plates by locally deforming without slitting or piercing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
ABSTRACT
A new punch anvil is provided for use with an axial punch for use in a fastening system of the kind in which the punch displaces a portion of one sheet member, such as a thin metal sheet, into another sheet to fasten them together, the punch and die cooperating to form a "button" of sideways displaced material that locks the sheets together. The anvil consists of two parts, one of which is of smaller transverse dimension than the other to form a transverse shoulder between them. The anvil end against which the members are clamped to be punched is surrounded by a jaw which is split longitudinally to be in at least two members held assembled by an encircling resilient ring or collar, so that the jaw members can move apart transversely and/or their upper ends in contact with the clamped members can rock apart on the shoulder to release them upon conclusion of the fastening operation. The jaw members are retained on the anvil as the punch withdraws by an annular ridge cooperating with an annular groove or by two radial pins. The longitudinal position of the anvil member may be adjusted to correspond with the punch stroke by means of a screw-threaded member in a correspondingly internally screw-threaded counter-bore.
A new punch anvil is provided for use with an axial punch for use in a fastening system of the kind in which the punch displaces a portion of one sheet member, such as a thin metal sheet, into another sheet to fasten them together, the punch and die cooperating to form a "button" of sideways displaced material that locks the sheets together. The anvil consists of two parts, one of which is of smaller transverse dimension than the other to form a transverse shoulder between them. The anvil end against which the members are clamped to be punched is surrounded by a jaw which is split longitudinally to be in at least two members held assembled by an encircling resilient ring or collar, so that the jaw members can move apart transversely and/or their upper ends in contact with the clamped members can rock apart on the shoulder to release them upon conclusion of the fastening operation. The jaw members are retained on the anvil as the punch withdraws by an annular ridge cooperating with an annular groove or by two radial pins. The longitudinal position of the anvil member may be adjusted to correspond with the punch stroke by means of a screw-threaded member in a correspondingly internally screw-threaded counter-bore.
Description
S2;~574 IMPROVEMENTS IN P~NCH ANVILS FOR SHEET FASTENING SYSTEMS
Field of the Invention This invention relates to a new punch anvil, such as is used for example in metal fasten~ng systems of the kind in which metal is displaced from one sheet metal member into another sheet metal member to hold the two of them together by means of a punch operation performed between a punch and the punch anvil.
Review of the Prior Art There i8 a continuing and increasing interest in sheet fastening systems of the kind in which, for example, two or more thin metal sheets are fastened securely together by punching part of one sheet into the other sheet. Such a system typically employs a metal rod-like punch which cooperates with a hollow anvil having openable jaws, the ~etal sheets to be fastened together resting on the anvil while the punch i8 brought forcefully into contact with the sheets to drive respective small portions of the sheets, corresponding in shape to the punch end, into an aperture in the anvil, Bo that the portion of the top sheet first contacted by the punch i8 driven through the underlying sheets into the anvil aperture, and pre$erably is caused to spread out radially so as to provide a more secure fastening. In ~any applications it is preferred that the punching does not perforate or crack the sheets, 80 that the fastening i8 fluid-tight. The punch i~ then withdrawn and the fastened sheets released from the anvil, the jaws of which open to facilitate the release. Such systems can replace spot welding systems and have a number of advantages over such ~Z~75'74 weldlng systems.
Definitlon of the Invention It is an ob~ect of the present invention to provide a new punch anvil for use in such sheet fastening operations.
It i8 another object to provide such an anvil with provision for ready release of the punched material from the anvil.
In accordance with the present invention there i8 provided a punch anvil for use with a punch in a sheet fastening operation in which two sheet members to be fastened together are punched during a punch operation between the punch and the punch anvil moving in a longitudinal direction relative to one another, the punch anvil comprising:
an anvil body having a first body portion and a second body portion longitudinally disposed with respect to one another;
the second body portion being of reduced transverse dimension relative to the first body portion to provide a shoulder between them extending transversely of the longitudinal direction;
the second body portion having an anvil member for cooperation with a punch member;
a jaw comprising at least two jaw members separate from one another in a respective longitudinal plane or planes and surrounding the second body portion and the anvil member, the members having a bore therebetween for reception during the punch operation of the punch and the corresponding parts of the sheet members to be joined;
the jaw members engaging the said transverse shoulder ~237S7~
at least during the punch operation and being supported thereby agaln~t the longitudinal force of the operation and against longitudinal movement, the members also being supported thereby during the punch operation for both rocking movement toward and away from one another and lateral displacement transversely outward away from the anvil;
means for retaining the jaw members against longitudinal movement with the punch relative to the second body portion upon withdrawal of the punch; and resilient retaining means urging the jaw members transversely inward toward the second body portion and the anvil while permitting the said rocking movement and lateral displacement thereof.
DescriPtion of the Drawings Punch anvils which are particular preferred embodiments of the invention will now be described, by way of example, with reference to the accompanying diagrammatic drawings wherein:
FIGURE 1 is an exploded view of a first single punch embodiment;
FIGURE 2 iB a side elevation of the embodiment of Figure 1 in assembled condition;
FIGURE 3 shows the embodiment of Figures 1 and 2 with the upper movable portion thereof in longitudinal cross-section to illustrate its operation;
FIGURE 4 is an exploded view of a second dual punch embodiment;
FIGURE 5 is a side elevation of the embodiment of Figure 4 in assembled condition;
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lZ37S74 FIGURE 6 is another side elevation of the embodiment of Figures 4 and 5 illustrating an aspect of it~ operation;
FIGURE 7 i~ a longitud~nal cross-section through a third embodiment; and S PIGU~E 8 is a side elevation of the embodiment of Figure 7 in assembled condition.
Similar parts are given the same reference number in all the figures of the drawings, whereverthat is possible.
Description of the Preferred Embodiments Referring initially to Figure 7, a punch anvil of the invention typically cooperates with a punch 10 and a clamp and stripper member 12, the punch moving in a longitudinal direction indicated by the arrow 14 to punch a depression in a plurality (only two shown) of superimposed layers 16 and 18, which usually are of metal, while they are held by the clamp member 12 against the anvil. The punch draws a portion 20 of the top layer 16, of shape corresponding to the shape of the end of the punch, through the other layer or layers and fastens them together.
Thus, the punch first draws and then compresses the material of the sheets reducing its thicknegs, resulting also in lateral displacement of the material to form an underlying ~button~ of larger diameter than the original draw which forms the fastening, It is important in many applications that the metal sheets are not cracked or perforated by this operation 80 that a fluid-tight fastening is obtained, e.g. in the joining of the parts of air conditioning ducts.
Referring now to Figures 1 to 3, a single punch punch anvil which is a first embodiment of the invention has an anvil ~LZ375'74 body comprising a cylindrical first body portion 22 and a longitudinally di~posed cylindrical second body portion 24 of reduced diameter, 80 that a flat, transversely extending annular shoulder 26 is formed between them. The second body portion has a longitudinal coaxial bore therein which receives with a snug fit replacable anvil member 28 having an upper anvil end of corresponding diameter. Bores 29 are provided for passage of a tool for removing the anvil when required.
The upper end of the punch anvil i8 provided with a longitudinally split cylindrical jaw, consisting in this embodiment of two equal jaw members 30, that surrounds the second upper body portion 24 and the reduced diameter anvil member 28. Thus, each jaw member has the respective half of an enlarged counter-bore 32 that permits it to surround the upper body portion 24, and a smaller diameter bore 34 that receives the anvil member 28 and the punch 10. The jaw is, in this embodiment, held assembled around the second portion 24 by two complete retaining rings 36 of resilient material that are engaged in a circumferential groove 38 in the exterior wall of the jaw member. It is found that commercial o-rings of appropriate diameters are very suitable for this purpose. The upper body portion 24 is provided with a transversely protruding circumferential ridge 40 which engages with clearance in a circumferential groove 42 in the wall of the counter-bore 32, the ridge and groove together constituting longitudinal eetaining means that retain the jaw member against longitudinal movement on the upper portion 24, especially while the punch 10 is being withdrawn.
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In this embodiment the lower circumferential faces 44 of the jaw members are formed convexly on a radius by a generator line parallel to and centered in the plane in which the jaw is divided. The portion of each face 44 close to the dividing plane is sufficiently flat, or is formed as a flat portion 44a, as shown in Figures 1-6 to be always in contact with the surface 26 and thus support the respective jaw member against the longitudinal pulsating forces applied thereto by the clamp 12 and the punch 10. However, the two parts of the jaw are able to move apart during the punching operation against the inward urging of the rings 36 to accommodate the sideways deformation of the metal sheets 16 and 18 that takes place by the action of the punch 10 against the anvil member 28, as described above. As is illustrated by Figure 3, this transverse outward movement could be by pure translational movement of the jaw parts, or by pure rocking (pivotal) movement, but more usually will be some combination of the two, so that the movement can automatically adjust itself to accommodate readily to differences in the thicknesses and the ductility of the materials being joined, thereby facilitating the formation of a secure joint without cracking or perforation of the metal sheets at the joint. Thus, with thin sheets the movement is more likely to be predominantly rocking, while with thicker sheets, or a larger number of sheets, more translational movement may be obtained. As the punch is withdrawn the engagement between the ridge 40 and groove 42 ensures that the jaw is retained against longitudinal movement with the punch, the encircling retaining rings 36 being sufficiently strong to ensure that enough engagement is maintained for this purpose.
~z375'74 It will be noted that in this embodiment the grooves 38 and 42 and the ridge 40 are subRtantially symmetrical about the same horizontal transverse plane parallel to the shoulder 26, and they are located in the lower portion of the jaw, thus facilitating the tilting or rocking of the jaw members, which is the preferred type of movement for release of the ~oint after its formation, but without preventing any of the translational movement of the jaw members that may be required.
It will be seen therefore that I have provided a new punch anvil of simple but flexible design permitting ready and automatic functioning of the anvil to accommodate different thicknesses of material to be fastened, and also enabling rapid replacement of the various parts, such a~ the anvil body 28 and the jaw members 30, as they become worn in use, because of its simple assembly and disassembly. By permitting the jaw members to ~float~ relatively freely supported on the shoulder in the manner described there are no pivots to which the punching force can be applied, which pivots are a potential source of breakage if the jaw members are not properly positioned during the punch stroke.
A multi-punch embodiment is illustrated by Figures 4 through 6, in which the second upper body portion 24 receives two transversely spaced parallel anvil pins 28, each being engaged in a respective bore 34 in the jaw member~ 30, 80 that two spaced joints can be formed simultaneously. The plane about which the two jaw members 30 separate passes through the longitudinal axes of both pins 28, and the jaw members rock to tilt out of this plane. In addition each jaw member 30 has a ~.237574 longitudinal lever member 46 extending downward through a respective slot 48 in the lower, second body part 22, so that the lever member protrudes into a respective recess 50 in the respective side of the lower first body part 22. As is apparent from a consideration of Figures 5 and 6, upon insertion of a fork shaped member 52, or two parallel members 52 into the recesses 50 the lever members 46 are forced inwards toward each other, 80 that the jaw me~bers are rocked outward away from each other, positively releasing the formed joint, if that should be necesgary. It i~ also sometimes found that the sheets to be joined include a layer of fibrous or shreadable material, and some of this material is torn from the sheet and becomes lodged between the jaw members, 80 that the anvil eventually becomes blocked with it. This can bè avoided by arranging that at some time during the punch cycle the jaw members are forced open by the action of the members 52 after the formation of the button and any such material blown away by an air blast.
A third embodiment is illustrated in Figures 7 and 8, the first lower body portion 22 being provided at its lower end with an internally screw-threaded counter-bore 52 in which a grub screw 54 is mounted for longitudinal movement, so as to provide corresponding longitudinal adjustment movement of the anvil body 28. The screw 54 i8 provided with a recess 56 for receipt of a wrench employed to rotate it. The longitudinal position of the anvil body can thus readily be adjusted to correspond accurately with the depth of stroke required by the punch to form a secure fastening. Also, during manufacture and assembly of the punch anvil, or replacement of a worn anvil - ~237~;'74 member, or repair of a worn anvil member, it is poRsible to move the anvll member 28 upward until its upper 6urface is flush with the upper surfaces of the jaw members 30 these flush $urfaces can then be machined simultaneously to ensure a desired match as to surface finish and flatnegs. This structure can of course also be employed in the two first described embodiments.
In this embodiment the retaining ridge and groove of the two prior embodiments are replaced by two coaxial pins 58 which extend radially from the second portion 24 into respective radial bores formed between the jaw members 30, the bores being split together with the jaw members in the same longitudinal plane. The longitudinal axis of the anvil body 28 also lies in this plane. The resilient retaining means 36 comprise a single incomplete ring of spring metal engaged in the groove 38, the lS ring belng shown partly broken away in Figure 8 to show the end of the pivot pin 58. ~he ring therefore also serves to retain the two pins against end-wise movement out of their respective bores. Such a ring could also be used in the two prior embodiments, or one or more resilient rings employed in this embodiment.
Although in the embodiments described the surface 26 is flat, while the jaw member surfaces 44 are convexly curved, it will be apparent that the arrangement can be reversed, or both surfaces can be convexly curved. With the embodiments of Figures 1 through 6 the retaining means 40 and 42 may have the ridge protruding ~rom the jaw members while the cooperating groove i8 provided ln the second part 24. In all the embodiments described the jaw is separated in a single plane into two jaw members, and this is particularly appropriate with the second multi-punch embodiment with the additional means for forcing the jaw members apart. However, in other embodiments the jaw may be split longitudinally in more than one plane to provide three or more jaw members.
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Field of the Invention This invention relates to a new punch anvil, such as is used for example in metal fasten~ng systems of the kind in which metal is displaced from one sheet metal member into another sheet metal member to hold the two of them together by means of a punch operation performed between a punch and the punch anvil.
Review of the Prior Art There i8 a continuing and increasing interest in sheet fastening systems of the kind in which, for example, two or more thin metal sheets are fastened securely together by punching part of one sheet into the other sheet. Such a system typically employs a metal rod-like punch which cooperates with a hollow anvil having openable jaws, the ~etal sheets to be fastened together resting on the anvil while the punch i8 brought forcefully into contact with the sheets to drive respective small portions of the sheets, corresponding in shape to the punch end, into an aperture in the anvil, Bo that the portion of the top sheet first contacted by the punch i8 driven through the underlying sheets into the anvil aperture, and pre$erably is caused to spread out radially so as to provide a more secure fastening. In ~any applications it is preferred that the punching does not perforate or crack the sheets, 80 that the fastening i8 fluid-tight. The punch i~ then withdrawn and the fastened sheets released from the anvil, the jaws of which open to facilitate the release. Such systems can replace spot welding systems and have a number of advantages over such ~Z~75'74 weldlng systems.
Definitlon of the Invention It is an ob~ect of the present invention to provide a new punch anvil for use in such sheet fastening operations.
It i8 another object to provide such an anvil with provision for ready release of the punched material from the anvil.
In accordance with the present invention there i8 provided a punch anvil for use with a punch in a sheet fastening operation in which two sheet members to be fastened together are punched during a punch operation between the punch and the punch anvil moving in a longitudinal direction relative to one another, the punch anvil comprising:
an anvil body having a first body portion and a second body portion longitudinally disposed with respect to one another;
the second body portion being of reduced transverse dimension relative to the first body portion to provide a shoulder between them extending transversely of the longitudinal direction;
the second body portion having an anvil member for cooperation with a punch member;
a jaw comprising at least two jaw members separate from one another in a respective longitudinal plane or planes and surrounding the second body portion and the anvil member, the members having a bore therebetween for reception during the punch operation of the punch and the corresponding parts of the sheet members to be joined;
the jaw members engaging the said transverse shoulder ~237S7~
at least during the punch operation and being supported thereby agaln~t the longitudinal force of the operation and against longitudinal movement, the members also being supported thereby during the punch operation for both rocking movement toward and away from one another and lateral displacement transversely outward away from the anvil;
means for retaining the jaw members against longitudinal movement with the punch relative to the second body portion upon withdrawal of the punch; and resilient retaining means urging the jaw members transversely inward toward the second body portion and the anvil while permitting the said rocking movement and lateral displacement thereof.
DescriPtion of the Drawings Punch anvils which are particular preferred embodiments of the invention will now be described, by way of example, with reference to the accompanying diagrammatic drawings wherein:
FIGURE 1 is an exploded view of a first single punch embodiment;
FIGURE 2 iB a side elevation of the embodiment of Figure 1 in assembled condition;
FIGURE 3 shows the embodiment of Figures 1 and 2 with the upper movable portion thereof in longitudinal cross-section to illustrate its operation;
FIGURE 4 is an exploded view of a second dual punch embodiment;
FIGURE 5 is a side elevation of the embodiment of Figure 4 in assembled condition;
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lZ37S74 FIGURE 6 is another side elevation of the embodiment of Figures 4 and 5 illustrating an aspect of it~ operation;
FIGURE 7 i~ a longitud~nal cross-section through a third embodiment; and S PIGU~E 8 is a side elevation of the embodiment of Figure 7 in assembled condition.
Similar parts are given the same reference number in all the figures of the drawings, whereverthat is possible.
Description of the Preferred Embodiments Referring initially to Figure 7, a punch anvil of the invention typically cooperates with a punch 10 and a clamp and stripper member 12, the punch moving in a longitudinal direction indicated by the arrow 14 to punch a depression in a plurality (only two shown) of superimposed layers 16 and 18, which usually are of metal, while they are held by the clamp member 12 against the anvil. The punch draws a portion 20 of the top layer 16, of shape corresponding to the shape of the end of the punch, through the other layer or layers and fastens them together.
Thus, the punch first draws and then compresses the material of the sheets reducing its thicknegs, resulting also in lateral displacement of the material to form an underlying ~button~ of larger diameter than the original draw which forms the fastening, It is important in many applications that the metal sheets are not cracked or perforated by this operation 80 that a fluid-tight fastening is obtained, e.g. in the joining of the parts of air conditioning ducts.
Referring now to Figures 1 to 3, a single punch punch anvil which is a first embodiment of the invention has an anvil ~LZ375'74 body comprising a cylindrical first body portion 22 and a longitudinally di~posed cylindrical second body portion 24 of reduced diameter, 80 that a flat, transversely extending annular shoulder 26 is formed between them. The second body portion has a longitudinal coaxial bore therein which receives with a snug fit replacable anvil member 28 having an upper anvil end of corresponding diameter. Bores 29 are provided for passage of a tool for removing the anvil when required.
The upper end of the punch anvil i8 provided with a longitudinally split cylindrical jaw, consisting in this embodiment of two equal jaw members 30, that surrounds the second upper body portion 24 and the reduced diameter anvil member 28. Thus, each jaw member has the respective half of an enlarged counter-bore 32 that permits it to surround the upper body portion 24, and a smaller diameter bore 34 that receives the anvil member 28 and the punch 10. The jaw is, in this embodiment, held assembled around the second portion 24 by two complete retaining rings 36 of resilient material that are engaged in a circumferential groove 38 in the exterior wall of the jaw member. It is found that commercial o-rings of appropriate diameters are very suitable for this purpose. The upper body portion 24 is provided with a transversely protruding circumferential ridge 40 which engages with clearance in a circumferential groove 42 in the wall of the counter-bore 32, the ridge and groove together constituting longitudinal eetaining means that retain the jaw member against longitudinal movement on the upper portion 24, especially while the punch 10 is being withdrawn.
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In this embodiment the lower circumferential faces 44 of the jaw members are formed convexly on a radius by a generator line parallel to and centered in the plane in which the jaw is divided. The portion of each face 44 close to the dividing plane is sufficiently flat, or is formed as a flat portion 44a, as shown in Figures 1-6 to be always in contact with the surface 26 and thus support the respective jaw member against the longitudinal pulsating forces applied thereto by the clamp 12 and the punch 10. However, the two parts of the jaw are able to move apart during the punching operation against the inward urging of the rings 36 to accommodate the sideways deformation of the metal sheets 16 and 18 that takes place by the action of the punch 10 against the anvil member 28, as described above. As is illustrated by Figure 3, this transverse outward movement could be by pure translational movement of the jaw parts, or by pure rocking (pivotal) movement, but more usually will be some combination of the two, so that the movement can automatically adjust itself to accommodate readily to differences in the thicknesses and the ductility of the materials being joined, thereby facilitating the formation of a secure joint without cracking or perforation of the metal sheets at the joint. Thus, with thin sheets the movement is more likely to be predominantly rocking, while with thicker sheets, or a larger number of sheets, more translational movement may be obtained. As the punch is withdrawn the engagement between the ridge 40 and groove 42 ensures that the jaw is retained against longitudinal movement with the punch, the encircling retaining rings 36 being sufficiently strong to ensure that enough engagement is maintained for this purpose.
~z375'74 It will be noted that in this embodiment the grooves 38 and 42 and the ridge 40 are subRtantially symmetrical about the same horizontal transverse plane parallel to the shoulder 26, and they are located in the lower portion of the jaw, thus facilitating the tilting or rocking of the jaw members, which is the preferred type of movement for release of the ~oint after its formation, but without preventing any of the translational movement of the jaw members that may be required.
It will be seen therefore that I have provided a new punch anvil of simple but flexible design permitting ready and automatic functioning of the anvil to accommodate different thicknesses of material to be fastened, and also enabling rapid replacement of the various parts, such a~ the anvil body 28 and the jaw members 30, as they become worn in use, because of its simple assembly and disassembly. By permitting the jaw members to ~float~ relatively freely supported on the shoulder in the manner described there are no pivots to which the punching force can be applied, which pivots are a potential source of breakage if the jaw members are not properly positioned during the punch stroke.
A multi-punch embodiment is illustrated by Figures 4 through 6, in which the second upper body portion 24 receives two transversely spaced parallel anvil pins 28, each being engaged in a respective bore 34 in the jaw member~ 30, 80 that two spaced joints can be formed simultaneously. The plane about which the two jaw members 30 separate passes through the longitudinal axes of both pins 28, and the jaw members rock to tilt out of this plane. In addition each jaw member 30 has a ~.237574 longitudinal lever member 46 extending downward through a respective slot 48 in the lower, second body part 22, so that the lever member protrudes into a respective recess 50 in the respective side of the lower first body part 22. As is apparent from a consideration of Figures 5 and 6, upon insertion of a fork shaped member 52, or two parallel members 52 into the recesses 50 the lever members 46 are forced inwards toward each other, 80 that the jaw me~bers are rocked outward away from each other, positively releasing the formed joint, if that should be necesgary. It i~ also sometimes found that the sheets to be joined include a layer of fibrous or shreadable material, and some of this material is torn from the sheet and becomes lodged between the jaw members, 80 that the anvil eventually becomes blocked with it. This can bè avoided by arranging that at some time during the punch cycle the jaw members are forced open by the action of the members 52 after the formation of the button and any such material blown away by an air blast.
A third embodiment is illustrated in Figures 7 and 8, the first lower body portion 22 being provided at its lower end with an internally screw-threaded counter-bore 52 in which a grub screw 54 is mounted for longitudinal movement, so as to provide corresponding longitudinal adjustment movement of the anvil body 28. The screw 54 i8 provided with a recess 56 for receipt of a wrench employed to rotate it. The longitudinal position of the anvil body can thus readily be adjusted to correspond accurately with the depth of stroke required by the punch to form a secure fastening. Also, during manufacture and assembly of the punch anvil, or replacement of a worn anvil - ~237~;'74 member, or repair of a worn anvil member, it is poRsible to move the anvll member 28 upward until its upper 6urface is flush with the upper surfaces of the jaw members 30 these flush $urfaces can then be machined simultaneously to ensure a desired match as to surface finish and flatnegs. This structure can of course also be employed in the two first described embodiments.
In this embodiment the retaining ridge and groove of the two prior embodiments are replaced by two coaxial pins 58 which extend radially from the second portion 24 into respective radial bores formed between the jaw members 30, the bores being split together with the jaw members in the same longitudinal plane. The longitudinal axis of the anvil body 28 also lies in this plane. The resilient retaining means 36 comprise a single incomplete ring of spring metal engaged in the groove 38, the lS ring belng shown partly broken away in Figure 8 to show the end of the pivot pin 58. ~he ring therefore also serves to retain the two pins against end-wise movement out of their respective bores. Such a ring could also be used in the two prior embodiments, or one or more resilient rings employed in this embodiment.
Although in the embodiments described the surface 26 is flat, while the jaw member surfaces 44 are convexly curved, it will be apparent that the arrangement can be reversed, or both surfaces can be convexly curved. With the embodiments of Figures 1 through 6 the retaining means 40 and 42 may have the ridge protruding ~rom the jaw members while the cooperating groove i8 provided ln the second part 24. In all the embodiments described the jaw is separated in a single plane into two jaw members, and this is particularly appropriate with the second multi-punch embodiment with the additional means for forcing the jaw members apart. However, in other embodiments the jaw may be split longitudinally in more than one plane to provide three or more jaw members.
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Claims (31)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A punch anvil for use with a punch in a sheet fastening operation in which two sheet members to be fastened together are punched during a punch operation between the punch and the punch anvil moving in a longitudinal direction relative to one another, the punch anvil comprising:
an anvil body having a first body portion and a second body portion longitudinally disposed with respect to one another;
the second body portion being of reduced transverse dimension relative to the first body portion to provide a shoulder between them extending transversely of the longitudinal direction;
the second body portion having an anvil member for cooperation with a punch member;
a jaw comprising at least two jaw members separate from one another in a respective longitudinal plane or planes and surrounding the second body portion and the anvil member, the members having a bore therebetween for reception during the punch operation of the punch and the corresponding parts of the sheet members to be joined;
the jaw members engaging the said transverse shoulder at least during the punch operation and being supported thereby against the longitudinal force of the operation and against longitudinal movement, the members also being supported thereby during the punch operation for both rocking movement and lateral displacement transversely outward away from the anvil;
means for retaining the jaw members against longitudinal movement with the punch relative to the second body portion upon withdrawal of the punch; and resilient retaining means urging the jaw members transversely inward toward the second body portion and the anvil while permitting the said rocking movement and lateral displacement thereof.
an anvil body having a first body portion and a second body portion longitudinally disposed with respect to one another;
the second body portion being of reduced transverse dimension relative to the first body portion to provide a shoulder between them extending transversely of the longitudinal direction;
the second body portion having an anvil member for cooperation with a punch member;
a jaw comprising at least two jaw members separate from one another in a respective longitudinal plane or planes and surrounding the second body portion and the anvil member, the members having a bore therebetween for reception during the punch operation of the punch and the corresponding parts of the sheet members to be joined;
the jaw members engaging the said transverse shoulder at least during the punch operation and being supported thereby against the longitudinal force of the operation and against longitudinal movement, the members also being supported thereby during the punch operation for both rocking movement and lateral displacement transversely outward away from the anvil;
means for retaining the jaw members against longitudinal movement with the punch relative to the second body portion upon withdrawal of the punch; and resilient retaining means urging the jaw members transversely inward toward the second body portion and the anvil while permitting the said rocking movement and lateral displacement thereof.
2. A punch anvil as claimed in claim 1, wherein the said first and second body portions are cylindrical and coaxial and the said shoulder is annular and flat.
3. A punch anvil as claimed in claim 1, wherein the said resilient retaining means comprise at least one complete ring of elastic resilient material encircling the jaw members and accommodated in a groove therein.
4. A punch anvil as claimed in claim 1, wherein the said resilient retaining means comprise at least one incomplete ring of spring metal encircling the jaw members and accommodated in a groove therein.
5. A punch anvil as claimed in claim 1, wherein the said means for retaining the jaw members against longitudinal movement relative to the second body portion comprise a transversely extending ridge on one engaged in a transversely extending groove in the other.
6. A punch anvil as claimed in claim 1, wherein the said means for retaining the jaw members against longitudinal movement relative to the second body portion comprise a transversely extending pin for each jaw member engaged in corresponding bores in the second body portion and the respective jaw member.
7. A punch anvil as claimed in claim 1, wherein the said shoulder is annular and flat and the surface of each jaw member engaging the shoulder is convex curved to permit the said rocking movement thereof.
8. A punch anvil as claimed in claim 1, wherein each jaw member has a respective lever member extending therefrom engagable by jaw opening means, the jaw opening means moving the lever member to rock the jaw members in the direction to open the jaw.
9. A punch anvil as claimed in claim 1, wherein the anvil member is of cylindrical cross-section and is mounted in a bore in the anvil second body portion for longitudinal adjustment movement therein, comprising:
an internally screw-threaded counter-bore in one end of the anvil body opening to the said axial bore, and a screw-threaded adjustment member engaged in the counter-bore and butting the anvil member for adjustment of the longitudinal position thereof in the anvil body bore.
an internally screw-threaded counter-bore in one end of the anvil body opening to the said axial bore, and a screw-threaded adjustment member engaged in the counter-bore and butting the anvil member for adjustment of the longitudinal position thereof in the anvil body bore.
10. A punch anvil for use with a punch in a sheet fastening operation in which two sheet members to be fastened together are punched during a punch operation between the punch and the punch anvil moving in a longitudinal direction relative to one another, the punch anvil comprising:
an anvil body having a first body portion and a second body portion longitudinally disposed with respect to one another;
the second body portion being of reduced transverse dimension relative to the first body portion to provide a shoulder between them extending transversely of the longitudinal direction;
the second body portion having an anvil member for cooperation with a punch member;
a jaw comprising at least two jaw members separate from one another in a respective longitudinal plane or planes and surrounding the second body portion and the anvil member, the members having a bore therebetween for reception during the punch operation of the punch and the interposed parts of the sheet members to be joined;
the jaw members having respective surfaces thereof in butting contact against a surface of the said transverse shoulder during the punch operation and thereby being supported by the shoulder against longitudinal movement under the longitudinal force of the punch operation, the jaw members also being supported by the shoulder during the punch operation for both rocking movement with said surfaces in said butting contact and relative lateral displacement of the shoulder and jaw member butting surfaces to permit movement of the jaw members transversely outward away from the anvil member;
retaining projection means extending from one of the second body portion and the jaw members and engaging in a retaining recess means in the respective other thereof for retaining the jaw members against longitudinal movement with the punch relative to the second body portion upon withdrawal of the punch; and resilient retaining means engaging the jaw members and urging them transversely inward toward each other and toward the second body portion and the anvil while permitting the said rocking movement and lateral displacement thereof.
an anvil body having a first body portion and a second body portion longitudinally disposed with respect to one another;
the second body portion being of reduced transverse dimension relative to the first body portion to provide a shoulder between them extending transversely of the longitudinal direction;
the second body portion having an anvil member for cooperation with a punch member;
a jaw comprising at least two jaw members separate from one another in a respective longitudinal plane or planes and surrounding the second body portion and the anvil member, the members having a bore therebetween for reception during the punch operation of the punch and the interposed parts of the sheet members to be joined;
the jaw members having respective surfaces thereof in butting contact against a surface of the said transverse shoulder during the punch operation and thereby being supported by the shoulder against longitudinal movement under the longitudinal force of the punch operation, the jaw members also being supported by the shoulder during the punch operation for both rocking movement with said surfaces in said butting contact and relative lateral displacement of the shoulder and jaw member butting surfaces to permit movement of the jaw members transversely outward away from the anvil member;
retaining projection means extending from one of the second body portion and the jaw members and engaging in a retaining recess means in the respective other thereof for retaining the jaw members against longitudinal movement with the punch relative to the second body portion upon withdrawal of the punch; and resilient retaining means engaging the jaw members and urging them transversely inward toward each other and toward the second body portion and the anvil while permitting the said rocking movement and lateral displacement thereof.
11. A punch anvil as claimed in claim 10, wherein the said first and second body portions are cylindrical and coaxial and the said shoulder is annular and flat.
12. A punch anvil as claimed in claim 10, wherein the said resilient retaining means comprise at least one complete ring of elastic resilient material encircling the jaw members and accommodated in a groove therein.
13. A punch anvil as claimed in claim 10, wherein the said resilient retaining means comprise at least one incomplete ring of spring metal encircling the jaw members and accommodated in a groove therein.
14. A punch anvil as claimed in claim 10, wherein the said retaining projection means and cooperating retaining recess means comprise a transversely extending circular ridge on one engaged in a transversely extending circular groove in the other.
15. A punch anvil as claimed in claim 10, wherein the said retaining projection means comprise a transversely extending pin for each jaw member engaged in cooperating recess means comprising corresponding bores in the respective jaw member.
16. A punch anvil as claimed in claim 10, wherein the said shoulder is annular and flat and the surface of each jaw member engaging the shoulder is convex curved to permit the said rocking movement thereof.
17. A punch anvil as claimed in claim 10, wherein each jaw member has a respective lever member extending therefrom engagable by jaw opening means, the jaw opening means moving the lever member to rock the jaw members in the direction to open the jaw.
18. A punch anvil as claimed in claim 10, wherein the anvil member is of cylindrical cross-section and is mounted in a bore in the anvil second body portion for longitudinal adjustment movement therein, comprising:
an internally screw-threaded counter-bore in one end of the anvil body opening to the said axial bore, and a screw-threaded adjustment member engaged in the counter-bore and butting the anvil member for adjustment of the longitudinal position thereof in the anvil body bore.
an internally screw-threaded counter-bore in one end of the anvil body opening to the said axial bore, and a screw-threaded adjustment member engaged in the counter-bore and butting the anvil member for adjustment of the longitudinal position thereof in the anvil body bore.
19. A punch anvil for use with a punch in a sheet fastening operation in which two sheet members to be fastened together are punched during a punch operation between the punch and the punch anvil moving in a longitudinal direction relative to one another, the punch anvil comprising:
an anvil body having a first body portion and a second body portion longitudinally disposed with respect to one another, the said body portions being cylindrical and coaxial;
the second body portion being of reduced transverse dimension relative to the first body portion to provide a flat annular shoulder between them extending transversely of the longitudinal direction;
the second body portion having an anvil member for cooperation with a punch member;
a jaw comprising at least two jaw members separate from one another in a respective longitudinal plane or planes and surrounding the second body portion and the anvil member, the jaw members having a bore therebetween for reception during the punch operation of the punch and the interposed parts of the sheet members to be joined;
the jaw members having repective convex curved surfaces thereof in butting contact against the flat annular surface of the said transverse shoulder during the punch operation, and thereby being supported by the shoulder against longitudinal movement under the longitudinal force of the punch operation, the jaw members also being supported by the shoulder during the punch operation for both rocking movement with said surfaces in said butting contact and relative lateral displacement of the shoulder and jaw member butting surfaces;
a transversely extending circular ridge on the second body portion engaging in a respective transversely extending circular groove in the jaw members for retaining the jaw members against longitudinal movement with the punch relative to the second body portion upon withdrawal of the punch; and at least one ring of resilient material comprising resilient retaining means embracing the jaw members and urging them transversely inward toward each other and toward the second body portion and the anvil while permitting the said rocking movement and lateral displacement thereof.
an anvil body having a first body portion and a second body portion longitudinally disposed with respect to one another, the said body portions being cylindrical and coaxial;
the second body portion being of reduced transverse dimension relative to the first body portion to provide a flat annular shoulder between them extending transversely of the longitudinal direction;
the second body portion having an anvil member for cooperation with a punch member;
a jaw comprising at least two jaw members separate from one another in a respective longitudinal plane or planes and surrounding the second body portion and the anvil member, the jaw members having a bore therebetween for reception during the punch operation of the punch and the interposed parts of the sheet members to be joined;
the jaw members having repective convex curved surfaces thereof in butting contact against the flat annular surface of the said transverse shoulder during the punch operation, and thereby being supported by the shoulder against longitudinal movement under the longitudinal force of the punch operation, the jaw members also being supported by the shoulder during the punch operation for both rocking movement with said surfaces in said butting contact and relative lateral displacement of the shoulder and jaw member butting surfaces;
a transversely extending circular ridge on the second body portion engaging in a respective transversely extending circular groove in the jaw members for retaining the jaw members against longitudinal movement with the punch relative to the second body portion upon withdrawal of the punch; and at least one ring of resilient material comprising resilient retaining means embracing the jaw members and urging them transversely inward toward each other and toward the second body portion and the anvil while permitting the said rocking movement and lateral displacement thereof.
20. A punch anvil as claimed in claim 19, wherein the said resilient retaining means comprise at least one complete ring of elastic resilient material encircling the jaw members and accommodated in a groove therein.
21. A punch anvil as claimed in claim 19, wherein the said resilient retaining means comprise at least one incomplete ring of spring metal encircling the jaw members and accommodated in a groove therein.
22. A punch anvil as claimed in claim 19, wherein each jaw member has a respective lever member extending therefrom engagable by jaw opening means, the jaw opening means moving the lever member to rock the jaw members in the direction to open the jaw.
23. A punch anvil as claimed in claim 19, wherein the anvil member is of cylindrical cross-section and is mounted in a bore in the anvil second body portion for longitudinal adjustment movement therein, comprising:
an internally screw-threaded counter-bore in one end of the anvil body opening to the said axial bore, and a screw-threaded adjustment member engaged in the counter-bore and butting the anvil member for adjustment of the longitudinal position thereof in the anvil body bore.
an internally screw-threaded counter-bore in one end of the anvil body opening to the said axial bore, and a screw-threaded adjustment member engaged in the counter-bore and butting the anvil member for adjustment of the longitudinal position thereof in the anvil body bore.
24. A punch anvil as claimed in any one of claims 1 to 3, wherein each jaw member surface engaging the transverse shoulder surface has the portion thereof immediately adjacent the said longitudinal plane or planes at least substantially flat and horizontal, the remainder of the jaw member surface diverging from the shoulder surface for the said rocking movement of the jaw member on the shoulder.
25. A punch anvil as claimed in any one of claims 4 to 6, wherein each jaw member surface engaging the transverse shoulder surface has the portion thereof immediately adjacent the said longitudinal plane or planes at least substantially flat and horizontal, the remainder of the jaw member surface diverging from the shoulder surface for the said rocking movement of the jaw member on the shoulder.
26. A punch anvil as claimed in any one of claims 7 to 9, wherein each jaw member surface engaging the transverse shoulder surface has the portion thereof immediately adjacent the said longitudinal plane or planes at least substantially flat and horizontal, the remainder of the jaw member surface diverging from the shoulder surface for the said rocking movement of the jaw member on the shoulder.
27. A punch anvil as claimed in any one of claims 10 to 12, wherein each jaw member surface engaging the transverse shoulder surface has the portion thereof immediately adjacent the said longitudinal plane or planes at least substantially flat and horizontal, the remainder of the jaw member surface diverging from the shoulder surface for the said rocking movement of the jaw member on the shoulder.
28. A punch anvil as claimed in any one of claims 13 to 15, wherein each jaw member surface engaging the transverse shoulder surface has the portion thereof immediately adjacent the said longitudinal plane or planes at least substantially flat and horizontal, the remainder of the jaw member surface diverging from the shoulder surface for the said rocking movement of the jaw member on the shoulder.
29. A punch anvil as claimed in any one of claims 16 to 18, wherein each jaw member surface engaging the transverse shoulder surface has the portion thereof immediately adjacent the said longitudinal plane or planes at least substantially flat and horizontal, the remainder of the jaw member surface diverging from the shoulder surface for the said rocking movement of the jaw member on the shoulder.
30. A punch anvil as claimed in any one of claims 19 to 21, wherein each jaw member surface engaging the transverse shoulder surface has the portion thereof immediately adjacent the said longitudinal plane or planes at least substantially flat and horizontal.
31. A punch anvil as claimed in any one of claims 22 or 23, wherein each jaw member surface engaging the transverse shoulder surface has the portion thereof immediately adjacent the said longitudinal plane or planes at least substantially flat and horizontal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US86291186A | 1986-05-14 | 1986-05-14 | |
| US06/862,911 | 1986-05-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1237574A true CA1237574A (en) | 1988-06-07 |
Family
ID=25339718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000536721A Expired CA1237574A (en) | 1986-05-14 | 1987-05-08 | Punch anvils for sheet fastening systems |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1237574A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0334070A2 (en) * | 1988-03-19 | 1989-09-27 | WALTER ECKOLD GmbH & Co. KG Vorrichtungs- und Gerätebau | Press tool set for connecting several superposed sheets together by way of local extrusion |
| US5177861A (en) * | 1980-09-08 | 1993-01-12 | Btm Corporation | Apparatus for joining sheet material |
| US5208974A (en) * | 1980-09-08 | 1993-05-11 | Btm Corporation | Apparatus for attaching a fastener to sheet material |
| US5208973A (en) * | 1980-09-08 | 1993-05-11 | Btm Corporation | Apparatus for joining sheet material |
| US5339509A (en) * | 1980-09-08 | 1994-08-23 | Btm Corporation | Method for attachment of fastener to sheet material |
| US5432989A (en) * | 1992-10-27 | 1995-07-18 | Archer Manufacturing Corporation | Apparatus and method for joining sheet material |
| US5435049A (en) * | 1980-09-08 | 1995-07-25 | Btm Corporation | Apparatus for joining sheet material |
| US5984563A (en) | 1994-07-22 | 1999-11-16 | Btm Corporation | Apparatus for joining sheet material and joint formed therein |
| WO2002043893A1 (en) * | 2000-11-28 | 2002-06-06 | Colin Maxwell Wade | Ductile material lance joiner |
| US8650730B2 (en) | 2009-02-23 | 2014-02-18 | Btm Corporation | Clinching tool |
| US10328481B2 (en) | 2014-03-18 | 2019-06-25 | Btm Company Llc | Clinching punch and apparatus |
-
1987
- 1987-05-08 CA CA000536721A patent/CA1237574A/en not_active Expired
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5581860A (en) | 1980-09-08 | 1996-12-10 | Btm Corporation | Apparatus for joining sheet material |
| US5177861A (en) * | 1980-09-08 | 1993-01-12 | Btm Corporation | Apparatus for joining sheet material |
| US5208974A (en) * | 1980-09-08 | 1993-05-11 | Btm Corporation | Apparatus for attaching a fastener to sheet material |
| US5208973A (en) * | 1980-09-08 | 1993-05-11 | Btm Corporation | Apparatus for joining sheet material |
| US5339509A (en) * | 1980-09-08 | 1994-08-23 | Btm Corporation | Method for attachment of fastener to sheet material |
| US5435049A (en) * | 1980-09-08 | 1995-07-25 | Btm Corporation | Apparatus for joining sheet material |
| EP0334070A3 (en) * | 1988-03-19 | 1990-12-27 | Walter Eckold Gmbh & Co. Kg Vorrichtungs- Und Geratebau | Press tool set for connecting several superposed sheets together by way of local extrusion |
| EP0334070A2 (en) * | 1988-03-19 | 1989-09-27 | WALTER ECKOLD GmbH & Co. KG Vorrichtungs- und Gerätebau | Press tool set for connecting several superposed sheets together by way of local extrusion |
| US5432989A (en) * | 1992-10-27 | 1995-07-18 | Archer Manufacturing Corporation | Apparatus and method for joining sheet material |
| US5984563A (en) | 1994-07-22 | 1999-11-16 | Btm Corporation | Apparatus for joining sheet material and joint formed therein |
| WO2002043893A1 (en) * | 2000-11-28 | 2002-06-06 | Colin Maxwell Wade | Ductile material lance joiner |
| US8650730B2 (en) | 2009-02-23 | 2014-02-18 | Btm Corporation | Clinching tool |
| US10328481B2 (en) | 2014-03-18 | 2019-06-25 | Btm Company Llc | Clinching punch and apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |