CA2204973C - Floating punch holder - Google Patents
Floating punch holder Download PDFInfo
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- CA2204973C CA2204973C CA002204973A CA2204973A CA2204973C CA 2204973 C CA2204973 C CA 2204973C CA 002204973 A CA002204973 A CA 002204973A CA 2204973 A CA2204973 A CA 2204973A CA 2204973 C CA2204973 C CA 2204973C
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- cavity
- shank
- upper portion
- punch
- holder according
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- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The present invention is related to a floating punch-holder comprising holding means adaptable to be attached to a punching apparatus, shank means having upper portion and lower portion, the upper portion of the shank being held by the holding means, punch means being connected to the lower portion of the shank means, die means adapted to cooperate with the punch means, wherein the holding means comprises a cavity adapted to accommodate and immobily lock the upper portion of the shank means, and wherein the upper portion having a configuration adapted to easily and accurately adjust the punch means in any position desired for alignment and centring with the die means while remaining in line as one or other adjustment is made. The holding means is incorporated within the punching apparatus, comprising a chuck means adaptable to be attached to the punching apparatus. The chuck means comprises an upper portion and lower portion, the upper portion is adapted to be securely attached to the apparatus and the lower portion accommodates the cavity and the chuck means has unitary configuration.
Description
FLOATING PUNCH-HOLDER
The present invention relates to an apparatus for affixing a punch onto a machine such as a punch press, more particularly to a floating punch-holder, and provide the means to align the punch within the punch-holder with a corresponding hole in a die set on the bed or horn ofthe 5 aforesaid machine to avoid the need of using a specialised machine or die set.
There is known US patent 4,757,609 describing an apparatus for joining sheet materials ili7ing a novel die construction showing a punch assembly of a conv~tion~l construction including a punch body supporting a stripper retainer. Disposed within the retainer is a stripper biased to the stripping position by means of coil springs.
There are also known mqrhines which are built especially for punching, and provide all the fiqrilities of qli~,.",~ without co_plications. However, these m ~hines can only be used ffir punching.
There are known machines called "C-Frame Holder"; this device is made to receive a punch and die which will be aligned at all times, but these tools are limited to be used only as an 15 edge punch-up to the throat depth ofthe frame holder.
CA 02204973 1997-0~-09 Also, there is known a floating punch-holder which comprises a two-piece chuck that has a hexagonal-shaped exterior with six cris-crossing Allen screws for ~lignm~nt The bottom portion of said chuck is used as a fastener. A "T"-shaped shank having a top portion of a larger diameter and of a circular configuration is placed in said two-piece chuck. In this tool, the adjll etments 5 which are made to ahgn the punch with the die will place the round-shaped top or head ofthe shank offcentre when using the adjustm~nt screws, and as a result, cause substantial difficulty in obtailLing accurate ~liy.. -~
There is also known US 3,296,905 related to a co~ress;~e stripping unit and indexing type nibbling punch for turret punch presses; this machine assures proper and complete stripping of blanked m~t~ri~l away from the punch and die. It further allows several and di~rcr lly-shaped punches to operate at di~er~.-l intervals. However, these punches and the complete apparatus has only possible vertical or up-and-down movements, and does not allow centring by means of lateral movements.
It is therefore a primary object ofthis invention to provide an improved and simplified apparatus which permits easy, quick and accurate ~lignm~nt of a punch with the corresponding blanking or drawing die.
The apparatus according to the present invention may be garnished with a stripper set on a spring so that the blanked material may be stripped from the punch. The collar may also be used as a pressure pad if the punch is used for drawing metal.
Another advantage ofthe present invention is that more than one punch-holder may be used eimlllt~neously without any (lim~.ei~m~l restrictions.
CA 02204973 1997-0~-09 These and other objects, features and advantages ofthe present invention will become appa,.,lll from the subsequent description and the appended claims, taken in conjunction with the accompanying drawings.
SUMMARY OF THE INVENTION
Broadly, the present invention comprises a floating punch-holder comprising:
holding means having an upper portion and a lower portion, said holding means is adaptable to be attached to a punching apparatus;
shank means having an upper portion or head and a lower portion, the upper portion of said shank being held by said holding means;
punch means being connected to the lower portion of said shank means;
die means adapted to cooperate with said punch means;
said holding means is provided with an open-ended cavity formed at the lower portion of said holding means, said cavity being adapted to accommodate and immobily lock the upper portion or head of said shank means, wherein the upper portion of said shank means has a configuration and ~im~n~ions allowing easy and accurate adjllctm~nt of said shank means within said cavity in any position necessary for precise ali~mPnt and c~ntring of said punch means with said die means, and wherein said adj~lstm~nt is provided by means of lateral movement ofthe upper portion of said shank means within said cavity.
In another embodiment of the present invention, said holding means comprises a chuck means, the upper portion of said chuck means is adapted to be securely attached to said punching CA 02204973 1997-0~-09 apparatus, and the upper and lower portion of said chuck means has a unitary or one-piece configuration.
In yet another embodiment ofthe present invention, said punch-holder further comprises:
an ~li~m~nt means located within said cavity, said ~lig~ means are adapted to cooperate 5 with the upper portion or head of said shank means and to adjust and hold said shank means in a set position, and fastener means also located within said cavity, said fastener means are adapted to securely hold or fasten the upper portion of said shank means within said cavity in an immobile position without disturbing the ~lignmPnt and c~ntring of said punch means with said die means.
In still another embodiment, said cavity has a configuration of a cylinder, said cylinder being extending upwardly from a bottom ofthe lower portion of said chuck means, and wherein said upper portion or head of said shank means has in cross-section a square-headed with rounded corners configuration, wherein said co~ alion is provided to facilitate easy positioning and adjll~tm~nt of said shank means within said cavity duTing centring or ~li~ing of said punch means 15 with said die means. Said ~li~m~nt means comprises a first set of cris-cross screws directed inwardly within said cavity, said screws being adapted to cooperate with corresponding sides of the upper portion of said shank means which allows to adjust said upper portion within said cavity in right-left or front-back directions duling alignm~nt of said punch means with said die means.
In yet again another embodiment ofthe present invention, said fastener means further 20 comprises:
tightening means located within said cavity and locking means also located within said cavity.
Said tight~ing means comprises a thread formed around an outer wall of said fastener means, said thread adapted to cooperate with a corresponding thread formed within said cavity. Said locking means comprises a combination of an obtuse-angled groove formed around the outer wall of said fastener means and a second set of inwardly directed cris-cross screws located within said 5 cavity, wherein said second set of screws is adapted to cooperate with said obtuse-angled groove by way of penetrating into said groove, thus forcing said fastener means upwardly to lock immobily the upper portion of said shank means within said cavity.
In still again another embodiment ofthe present invention, said groove comprises an upper edge and a lower edge, and wherein the upper edge of said groove is longer than the lower edge 10 of said groove to f~cilit~te successful locking of said shank means by said second set of cris-cross screws. Said groove is formed below the thread of said f~st~ner means, and the upper portion of said chuck means may comprise a plate. Said shank means has in cross-section a T-shaped configuration, and the upper portion of said chuck means has a configuration of upwardly extending flange or stub.
In sti11 yet another embodiment, the present invention comprises a floating punch-holder in combination with punching apparatus, said floating punch comprising:
holding means having upper portion and lower portion, said holding means is adaptable to be attached to a punching apparatus;
shank means having an upper portion or head and a lower portion, the upper portion of said 20 shank being held by said holding means;
punch means being connected to the lower portion of said shank means;
die means adapted to cooperate with said punch means;
said holding means is provided with an open-ended cavity formed at the lower portion of said holding means, said cavity being adapted to accommodate and immobily lock the upper portion of said shank means, wherein the upper portion of said shank means has a configuration and 5 (lim~n~ions allowing easy and accurate adj~ nt of said shank means within said cavity in any position necessary for precise ~ nm~nt and centring of said punch means with said die means, and wherein said adjllstm~nt is provided by means of lateral movement ofthe upper portion of said shank means within said cavity.
In yet another embodiment, said punch-holder further comprises a locking means located 10 within said cavity, said locking means are adapted to cooperate with the upper portion or head of said shank means to adjust and hold said shank means in a set position and further to lock said shank means immobily within said cavity. The upper portion or head of said shank means has in cross-section a square-headed with bevelled corners configuration, and wherein sides of said upper portion or head being tapered downwardly under predetermined angle which faci1itate easy 15 positioning and adjlls~m~nt of said shank means within said cavity during centring of said punch means with said die means and further locking immobily the upper portion of said shank means within said cavity.
Tn still another embodiment, said locking means comprises a set of cris-cross screws directed inwardly upwardly within said cavity, said set of screws being adapted to cooperate with 20 corresponding sides ofthe upper portion of said shank means to facilitate immobile locking of said shank means within said cavity by means of forcing upwardly the upper portion or head of CA 02204973 1997-0~-09 said shank means within said cavity. An opening portion or entrance of said cavity has in cross-section a configuration corresponding to the configuration of the upper portion or head of said shank means, and wherein positioning of said shank means within said cavity is provided by means of preli~illary a~al rotating of said shank means within said cavity at 45~ which facilitates proper 5 positioning of sides of said upper portion or head against corresponding screws of said set of cris-cross screws and ret~ining of said shank means in place during positioning.
BRIEF DESCRIPTION OF THE DRAWINGS
10 Fig. 1 shows a side cross-section ofthe floating punch-holder according to the present invention.
Fig. 2 shows a side cross-section view ofthe first modification ofthe chuck means taken along the lines A-A of Fig.3.
Fig. 3 shows a bottom view of Fig. 2.
Fig. 4 shows a side view of the fastener means according to the present invention.
15 Fig. 5 is a bottom view of Fig. 4.
Fig. 6 shows a side view of the shank means according to the present invention.
Fig. 7 is a bottomview of Fig.6.
Fig. 8 shows a partial side cross-section ofthe punch-holder with a chuck means ofthe second mo-lific~tion.
20 Fig. 9 is a top view of Fig. 8.
Fig. 10 shows a schematic plan cross-section view ofthe Prior Art .
Fig. 11 shows a schematic plan cross-section view ofthe assembly according to the present invention.
Fig. 12 is a side cross-section ofthe floating punch-holder showing a second embodiment ofthe present invention.
5 Fig. 13 is a bottom view of shank means shown on Fig. 12.
Fig. 14 is a side cross-section view ofthe chuck means shown on Fig. 12.
Fig. 15isabottomviewofchuckmeansofFig. 14.
Fig. 16 is a bottomview ofthe floating punch-holder of Fig. 12.
DETAILED DESCRIPTION OF THE PRESENT EMBODIMENTS
Referring now to drawings, Fig. 1 shows a floating punch-holder 10 comprising a chuck means 12 of unitary configuration having an upper portion 14 having in the first embodiment a shape of a stub provided for f~ ning into a ram. The lower portion 16 ofthe chuck 12 has a cavity 15 cl)nci~ting of a lower cavity 20 and an upper cavity 22. Preferably, the cavity 15 is of 15 round or cylindrical configuration (see Fig. 2). Figures 6 and 7 show a shank means comprising an upper portion or head 26 and a shank 24 adapted to hold a punch 48 inserted into a bore 32 by means of a set screw (not shown) which is inserted into the corresponding opening 46. The head 26 ofthe shank 24 has a square-shaped configuration with rounded corners, and is of smaller dimension than the dimension ofthe upper portion 22 ofthe cavity 15. The shape ofthe head 20 provides easy and wider adj~ nt of said shank 23 within the cavity 15, and also allows the shank 23 to be adj~ ble right-left or front-back during ~lignm~nt Said head 26 is aligned within the upper portion 22 ofthe cavity 15 by ~lignmP.nt means CO~~ g a set of cris-cross screws 58 being inserted within the corresponding openings 18 formed in the lower portion 16 of chuck 12.
The punch-holder according to the present invention fu~ther comprises a fastener means or collar 34 (see Figures 4 and 5) which is adapted to be fastened into the cavity 15 ofthe chuck 12 5 by tightening means or thread portion 36 formed on the outer wall of said fastener 34. The fastener 34 is adapted to securely lock said shank means 23 within said cavity 15. The thread portion 36 in this case is cooperating with the corres~onding thread formed around an inner wall ofthe lower portion 20 ofthe cavity 15. Below the thread portion 36 and around the outer wall of the f~tPnPr 34, a groove 38 with an obtuse angle in cross-section is formed. Preferably, an upper 10 edge ofthe groove 38 is longer than a lower edge to facilitate successful locking of said fastener 34, wherein the groove is adapted to cooperate with a set of cris-cross screws 60 which are screwed into four corresponding openings 19 located at the lower portion 16 of chuck 12. This combination of groove 38 and set of cris-crossed screws 60 comprises a locking means, wherein said screws are adapted to penetrate into said groove 38 thus forcing said fastener 34 upwardly to lock immobily the shank 24 within the cavity 15. The lower portion 40 ofthe fastener 34 is easily tightened within the cavity 15 by means of a conventional tool such as wrench. Fig. 8 and 9 show a second modification ofthe chuck means having an upper portion made in the shape of plate 42 which is attached to the punch machine by means of screws (not shown) inserted into the corresponding openings 44 on said plate 42. Such an arrangement allows the user to mount or 20 hold a number of punch-holders 10 aligned to each other.
CA 02204973 1997-0~-09 The lower portion ofthe shank 24 is provided with a bore 32 for holding punch 48 by means of a set screw (not shown) to be inserted within the corresponding opening 46. The punch-holder further includes a spring holder 52, crown 54 and a spring 50. A tip 56 ofthe punch 48 is adapted to cooperate with a die means (not shown) to perform a punching process.The c~ntring operation ofthe punch 48 is done by first unscrewing set screws 58 and 60, and then loosening the fastener 34 just until it is not tight. The punch can then be moved to the right by unscrewing the set screws 58 on the right and tight~ning the set screws 58 on the le~.
This method or the reverse is used for moving the punch right or left and front or back. Usually, minor a~ lstm~nts can be made by proceeding with successive steps of one quarter turn for each screw. Fastener 34 and all screws must be tightened when the adj~lstment is completed. The inspection for concentricity can be made visually. Thinner mqt~riql, such as 0.012 " or 0.3mm require greater accuracy than thicker material, such as .018" + or 0.45mm+.
The punch-holder according to the present invention in combination with the conventional punch apparatus is adaptable to be adjusted to perform any punch operation providing forming or deforming materials, such as joining, fq.~tenin~; blqnking drawing, swaging, stamping and mqrkin~
The unique feature of the punch-holder according to the present invention allows easy fq.~ning of steel thicknesses as light as 0.010" as well as stainless steel with a strong lock.
The apparatus of the present invention provides a variety of toohng configurations and thus, to m~mlf~lre ~lilI~r~ -shaped products which may have hard-to-reach corners, narrow flanges, high sides and other ele1n~nts It is highly effiGi~nt in the air distribution industry for mqmlfqctllrin~ of ducts, elbows, and fittings.
The floating punch-holder according to the present invention makes it possible to iimllltqneously install one or more punches in ahgned configuration onto or within the ram ofthe machine, such as a punch press with a mating die or dies on the bed or horn of said machine, thus 5 el~inating the need of a die set or "C" frame, and be perfectly ahgned and centred with said mating die or dies.
Fig. 10 shows a prior art design, wherein the round-shaped head ofthe shank is mounted within a hexagonal-shaped two-piece chuck in which the lower part is pelrol~ g the function of a fastener. In this arrangement it is necessary to use six adj~lstmPnt set screws to make an 10 qli~m~t operation. However, these adj~lstm~nt screws may cause the head ofthe shank to be "ofP' centre, thus reslllting in micqlignm~nt To tighten the system, the fastener is turned, which disturbs the adj~lstment However when joining light gauge material, the adj~l~tm~nt must be very accurate to prevent damage.
This problem does not exist with the present configuration ofthe head (see Fig. 11). The 15 improved square-shaped head with round corners leaves the shank immobile as the system is tightened by means of fastener 34 and locked by means of set screws 60.
Referringnow to drawings, Figs. 12-16 show a second embodiment ofthe floating punch-holder 10 comprising the chuck means 12 of unitary configuration and having the upper portion 14 similar to the one shown on Fig. 1. However, the lower portion 62issubst~ntiqlly shorter that the one of Fig. 1 in view of the fact that this embodiment of punch-holder elimin~tes the need offastener 34 and two set of screws 58 and 60. In this improved embodiment the lower portion 62 of chuck 12 is provided with an open ended cavity formed within said lower portion 62. This cavity consists of an upper cylindrical cavity 63 and a lower cavity or opening 66. There are locking means located within said cavity which comprise a set of cris-cross screws 74 adapted to be screwed into corresponding lhl~ded openings 64 formed within the lower portion 62 of chuck 12. Those openings 64 are directed inwardly upwardly under a predetermined angle.
Preferably but not necessqrily, this angle is about 20 degrees. The lower cavity or opening 66 has in cross-section a configuration corresponding to the configuration of the upper portion or head 68 of shank 23. As it shown on Fig. 13, the upper portion or head 68 has in cross-section a square-headed with bevelled corners 72 configuration. Sides 70 of said head 68 taper downwardly under a predetçrrn; led angle. The configuration ofthe lower portion of shank 23 and punch assembly is i~l~nticql to the first embodiment shown on Fig. 1 and will be not discussed in detail. It is also possible to make the upper portion of chuck 12 having configuration shown on Figs. 8 and 9 made as the plate 42 instead of stub 14.
In operation, the shank 23 is inserted into the upper cavity 63 through the opening 66 and is then turned axially within said cavity 63 at 45~; this is necessary to retain the shank 23 in place before c~trin~ of punch-holder is initiqted The c~ntring operation is similar to centring ofthe punch-holder of the first embodiment. Firstly, all four screws 74 should be loosened. Then, the punch can be centred with the die by means of lateral movement ofthe upper portion or head 68 within the cavity 63 in right-left and back-front positions, wherein corresponding set of cris-cross screws 74 are tightened. These screws 74 are adapted to cooperate with angled sides 70 ofthe head 68 not only to adjust and hold the shank 23 in a set position, but also to further lock said CA 02204973 1997-0~-09 shank 23 immobily within the upper cavity 63. This locking operation is provided by means of locking said screws 74 using locknuts 78. As a result, when screws 74 are gradually tightened, the upper portion or head 68 is forced upwardly until it abuts an inside face 76 ofthe chuck 12 and shank 23 is immobily locked in place.
The advantage ofthe second embodiment is the fact that this structure elimin~tes the necessity of using a fastener. Besides, since cavities 63 and 66 are much shorter than in the first mo~ific~tion this allows f~t~ning of products having higher sides.
The foregoing discloses and describes exemplary embodiments ofthe present invention.
One skilled in the art will readily recognize from such discussion and from the accompanying drawings that various changes, modifications and variations may be made therein without departing fromthe spirit and scope ofthe invention as defined in the following claims.
The present invention relates to an apparatus for affixing a punch onto a machine such as a punch press, more particularly to a floating punch-holder, and provide the means to align the punch within the punch-holder with a corresponding hole in a die set on the bed or horn ofthe 5 aforesaid machine to avoid the need of using a specialised machine or die set.
There is known US patent 4,757,609 describing an apparatus for joining sheet materials ili7ing a novel die construction showing a punch assembly of a conv~tion~l construction including a punch body supporting a stripper retainer. Disposed within the retainer is a stripper biased to the stripping position by means of coil springs.
There are also known mqrhines which are built especially for punching, and provide all the fiqrilities of qli~,.",~ without co_plications. However, these m ~hines can only be used ffir punching.
There are known machines called "C-Frame Holder"; this device is made to receive a punch and die which will be aligned at all times, but these tools are limited to be used only as an 15 edge punch-up to the throat depth ofthe frame holder.
CA 02204973 1997-0~-09 Also, there is known a floating punch-holder which comprises a two-piece chuck that has a hexagonal-shaped exterior with six cris-crossing Allen screws for ~lignm~nt The bottom portion of said chuck is used as a fastener. A "T"-shaped shank having a top portion of a larger diameter and of a circular configuration is placed in said two-piece chuck. In this tool, the adjll etments 5 which are made to ahgn the punch with the die will place the round-shaped top or head ofthe shank offcentre when using the adjustm~nt screws, and as a result, cause substantial difficulty in obtailLing accurate ~liy.. -~
There is also known US 3,296,905 related to a co~ress;~e stripping unit and indexing type nibbling punch for turret punch presses; this machine assures proper and complete stripping of blanked m~t~ri~l away from the punch and die. It further allows several and di~rcr lly-shaped punches to operate at di~er~.-l intervals. However, these punches and the complete apparatus has only possible vertical or up-and-down movements, and does not allow centring by means of lateral movements.
It is therefore a primary object ofthis invention to provide an improved and simplified apparatus which permits easy, quick and accurate ~lignm~nt of a punch with the corresponding blanking or drawing die.
The apparatus according to the present invention may be garnished with a stripper set on a spring so that the blanked material may be stripped from the punch. The collar may also be used as a pressure pad if the punch is used for drawing metal.
Another advantage ofthe present invention is that more than one punch-holder may be used eimlllt~neously without any (lim~.ei~m~l restrictions.
CA 02204973 1997-0~-09 These and other objects, features and advantages ofthe present invention will become appa,.,lll from the subsequent description and the appended claims, taken in conjunction with the accompanying drawings.
SUMMARY OF THE INVENTION
Broadly, the present invention comprises a floating punch-holder comprising:
holding means having an upper portion and a lower portion, said holding means is adaptable to be attached to a punching apparatus;
shank means having an upper portion or head and a lower portion, the upper portion of said shank being held by said holding means;
punch means being connected to the lower portion of said shank means;
die means adapted to cooperate with said punch means;
said holding means is provided with an open-ended cavity formed at the lower portion of said holding means, said cavity being adapted to accommodate and immobily lock the upper portion or head of said shank means, wherein the upper portion of said shank means has a configuration and ~im~n~ions allowing easy and accurate adjllctm~nt of said shank means within said cavity in any position necessary for precise ali~mPnt and c~ntring of said punch means with said die means, and wherein said adj~lstm~nt is provided by means of lateral movement ofthe upper portion of said shank means within said cavity.
In another embodiment of the present invention, said holding means comprises a chuck means, the upper portion of said chuck means is adapted to be securely attached to said punching CA 02204973 1997-0~-09 apparatus, and the upper and lower portion of said chuck means has a unitary or one-piece configuration.
In yet another embodiment ofthe present invention, said punch-holder further comprises:
an ~li~m~nt means located within said cavity, said ~lig~ means are adapted to cooperate 5 with the upper portion or head of said shank means and to adjust and hold said shank means in a set position, and fastener means also located within said cavity, said fastener means are adapted to securely hold or fasten the upper portion of said shank means within said cavity in an immobile position without disturbing the ~lignmPnt and c~ntring of said punch means with said die means.
In still another embodiment, said cavity has a configuration of a cylinder, said cylinder being extending upwardly from a bottom ofthe lower portion of said chuck means, and wherein said upper portion or head of said shank means has in cross-section a square-headed with rounded corners configuration, wherein said co~ alion is provided to facilitate easy positioning and adjll~tm~nt of said shank means within said cavity duTing centring or ~li~ing of said punch means 15 with said die means. Said ~li~m~nt means comprises a first set of cris-cross screws directed inwardly within said cavity, said screws being adapted to cooperate with corresponding sides of the upper portion of said shank means which allows to adjust said upper portion within said cavity in right-left or front-back directions duling alignm~nt of said punch means with said die means.
In yet again another embodiment ofthe present invention, said fastener means further 20 comprises:
tightening means located within said cavity and locking means also located within said cavity.
Said tight~ing means comprises a thread formed around an outer wall of said fastener means, said thread adapted to cooperate with a corresponding thread formed within said cavity. Said locking means comprises a combination of an obtuse-angled groove formed around the outer wall of said fastener means and a second set of inwardly directed cris-cross screws located within said 5 cavity, wherein said second set of screws is adapted to cooperate with said obtuse-angled groove by way of penetrating into said groove, thus forcing said fastener means upwardly to lock immobily the upper portion of said shank means within said cavity.
In still again another embodiment ofthe present invention, said groove comprises an upper edge and a lower edge, and wherein the upper edge of said groove is longer than the lower edge 10 of said groove to f~cilit~te successful locking of said shank means by said second set of cris-cross screws. Said groove is formed below the thread of said f~st~ner means, and the upper portion of said chuck means may comprise a plate. Said shank means has in cross-section a T-shaped configuration, and the upper portion of said chuck means has a configuration of upwardly extending flange or stub.
In sti11 yet another embodiment, the present invention comprises a floating punch-holder in combination with punching apparatus, said floating punch comprising:
holding means having upper portion and lower portion, said holding means is adaptable to be attached to a punching apparatus;
shank means having an upper portion or head and a lower portion, the upper portion of said 20 shank being held by said holding means;
punch means being connected to the lower portion of said shank means;
die means adapted to cooperate with said punch means;
said holding means is provided with an open-ended cavity formed at the lower portion of said holding means, said cavity being adapted to accommodate and immobily lock the upper portion of said shank means, wherein the upper portion of said shank means has a configuration and 5 (lim~n~ions allowing easy and accurate adj~ nt of said shank means within said cavity in any position necessary for precise ~ nm~nt and centring of said punch means with said die means, and wherein said adjllstm~nt is provided by means of lateral movement ofthe upper portion of said shank means within said cavity.
In yet another embodiment, said punch-holder further comprises a locking means located 10 within said cavity, said locking means are adapted to cooperate with the upper portion or head of said shank means to adjust and hold said shank means in a set position and further to lock said shank means immobily within said cavity. The upper portion or head of said shank means has in cross-section a square-headed with bevelled corners configuration, and wherein sides of said upper portion or head being tapered downwardly under predetermined angle which faci1itate easy 15 positioning and adjlls~m~nt of said shank means within said cavity during centring of said punch means with said die means and further locking immobily the upper portion of said shank means within said cavity.
Tn still another embodiment, said locking means comprises a set of cris-cross screws directed inwardly upwardly within said cavity, said set of screws being adapted to cooperate with 20 corresponding sides ofthe upper portion of said shank means to facilitate immobile locking of said shank means within said cavity by means of forcing upwardly the upper portion or head of CA 02204973 1997-0~-09 said shank means within said cavity. An opening portion or entrance of said cavity has in cross-section a configuration corresponding to the configuration of the upper portion or head of said shank means, and wherein positioning of said shank means within said cavity is provided by means of preli~illary a~al rotating of said shank means within said cavity at 45~ which facilitates proper 5 positioning of sides of said upper portion or head against corresponding screws of said set of cris-cross screws and ret~ining of said shank means in place during positioning.
BRIEF DESCRIPTION OF THE DRAWINGS
10 Fig. 1 shows a side cross-section ofthe floating punch-holder according to the present invention.
Fig. 2 shows a side cross-section view ofthe first modification ofthe chuck means taken along the lines A-A of Fig.3.
Fig. 3 shows a bottom view of Fig. 2.
Fig. 4 shows a side view of the fastener means according to the present invention.
15 Fig. 5 is a bottom view of Fig. 4.
Fig. 6 shows a side view of the shank means according to the present invention.
Fig. 7 is a bottomview of Fig.6.
Fig. 8 shows a partial side cross-section ofthe punch-holder with a chuck means ofthe second mo-lific~tion.
20 Fig. 9 is a top view of Fig. 8.
Fig. 10 shows a schematic plan cross-section view ofthe Prior Art .
Fig. 11 shows a schematic plan cross-section view ofthe assembly according to the present invention.
Fig. 12 is a side cross-section ofthe floating punch-holder showing a second embodiment ofthe present invention.
5 Fig. 13 is a bottom view of shank means shown on Fig. 12.
Fig. 14 is a side cross-section view ofthe chuck means shown on Fig. 12.
Fig. 15isabottomviewofchuckmeansofFig. 14.
Fig. 16 is a bottomview ofthe floating punch-holder of Fig. 12.
DETAILED DESCRIPTION OF THE PRESENT EMBODIMENTS
Referring now to drawings, Fig. 1 shows a floating punch-holder 10 comprising a chuck means 12 of unitary configuration having an upper portion 14 having in the first embodiment a shape of a stub provided for f~ ning into a ram. The lower portion 16 ofthe chuck 12 has a cavity 15 cl)nci~ting of a lower cavity 20 and an upper cavity 22. Preferably, the cavity 15 is of 15 round or cylindrical configuration (see Fig. 2). Figures 6 and 7 show a shank means comprising an upper portion or head 26 and a shank 24 adapted to hold a punch 48 inserted into a bore 32 by means of a set screw (not shown) which is inserted into the corresponding opening 46. The head 26 ofthe shank 24 has a square-shaped configuration with rounded corners, and is of smaller dimension than the dimension ofthe upper portion 22 ofthe cavity 15. The shape ofthe head 20 provides easy and wider adj~ nt of said shank 23 within the cavity 15, and also allows the shank 23 to be adj~ ble right-left or front-back during ~lignm~nt Said head 26 is aligned within the upper portion 22 ofthe cavity 15 by ~lignmP.nt means CO~~ g a set of cris-cross screws 58 being inserted within the corresponding openings 18 formed in the lower portion 16 of chuck 12.
The punch-holder according to the present invention fu~ther comprises a fastener means or collar 34 (see Figures 4 and 5) which is adapted to be fastened into the cavity 15 ofthe chuck 12 5 by tightening means or thread portion 36 formed on the outer wall of said fastener 34. The fastener 34 is adapted to securely lock said shank means 23 within said cavity 15. The thread portion 36 in this case is cooperating with the corres~onding thread formed around an inner wall ofthe lower portion 20 ofthe cavity 15. Below the thread portion 36 and around the outer wall of the f~tPnPr 34, a groove 38 with an obtuse angle in cross-section is formed. Preferably, an upper 10 edge ofthe groove 38 is longer than a lower edge to facilitate successful locking of said fastener 34, wherein the groove is adapted to cooperate with a set of cris-cross screws 60 which are screwed into four corresponding openings 19 located at the lower portion 16 of chuck 12. This combination of groove 38 and set of cris-crossed screws 60 comprises a locking means, wherein said screws are adapted to penetrate into said groove 38 thus forcing said fastener 34 upwardly to lock immobily the shank 24 within the cavity 15. The lower portion 40 ofthe fastener 34 is easily tightened within the cavity 15 by means of a conventional tool such as wrench. Fig. 8 and 9 show a second modification ofthe chuck means having an upper portion made in the shape of plate 42 which is attached to the punch machine by means of screws (not shown) inserted into the corresponding openings 44 on said plate 42. Such an arrangement allows the user to mount or 20 hold a number of punch-holders 10 aligned to each other.
CA 02204973 1997-0~-09 The lower portion ofthe shank 24 is provided with a bore 32 for holding punch 48 by means of a set screw (not shown) to be inserted within the corresponding opening 46. The punch-holder further includes a spring holder 52, crown 54 and a spring 50. A tip 56 ofthe punch 48 is adapted to cooperate with a die means (not shown) to perform a punching process.The c~ntring operation ofthe punch 48 is done by first unscrewing set screws 58 and 60, and then loosening the fastener 34 just until it is not tight. The punch can then be moved to the right by unscrewing the set screws 58 on the right and tight~ning the set screws 58 on the le~.
This method or the reverse is used for moving the punch right or left and front or back. Usually, minor a~ lstm~nts can be made by proceeding with successive steps of one quarter turn for each screw. Fastener 34 and all screws must be tightened when the adj~lstment is completed. The inspection for concentricity can be made visually. Thinner mqt~riql, such as 0.012 " or 0.3mm require greater accuracy than thicker material, such as .018" + or 0.45mm+.
The punch-holder according to the present invention in combination with the conventional punch apparatus is adaptable to be adjusted to perform any punch operation providing forming or deforming materials, such as joining, fq.~tenin~; blqnking drawing, swaging, stamping and mqrkin~
The unique feature of the punch-holder according to the present invention allows easy fq.~ning of steel thicknesses as light as 0.010" as well as stainless steel with a strong lock.
The apparatus of the present invention provides a variety of toohng configurations and thus, to m~mlf~lre ~lilI~r~ -shaped products which may have hard-to-reach corners, narrow flanges, high sides and other ele1n~nts It is highly effiGi~nt in the air distribution industry for mqmlfqctllrin~ of ducts, elbows, and fittings.
The floating punch-holder according to the present invention makes it possible to iimllltqneously install one or more punches in ahgned configuration onto or within the ram ofthe machine, such as a punch press with a mating die or dies on the bed or horn of said machine, thus 5 el~inating the need of a die set or "C" frame, and be perfectly ahgned and centred with said mating die or dies.
Fig. 10 shows a prior art design, wherein the round-shaped head ofthe shank is mounted within a hexagonal-shaped two-piece chuck in which the lower part is pelrol~ g the function of a fastener. In this arrangement it is necessary to use six adj~lstmPnt set screws to make an 10 qli~m~t operation. However, these adj~lstm~nt screws may cause the head ofthe shank to be "ofP' centre, thus reslllting in micqlignm~nt To tighten the system, the fastener is turned, which disturbs the adj~lstment However when joining light gauge material, the adj~l~tm~nt must be very accurate to prevent damage.
This problem does not exist with the present configuration ofthe head (see Fig. 11). The 15 improved square-shaped head with round corners leaves the shank immobile as the system is tightened by means of fastener 34 and locked by means of set screws 60.
Referringnow to drawings, Figs. 12-16 show a second embodiment ofthe floating punch-holder 10 comprising the chuck means 12 of unitary configuration and having the upper portion 14 similar to the one shown on Fig. 1. However, the lower portion 62issubst~ntiqlly shorter that the one of Fig. 1 in view of the fact that this embodiment of punch-holder elimin~tes the need offastener 34 and two set of screws 58 and 60. In this improved embodiment the lower portion 62 of chuck 12 is provided with an open ended cavity formed within said lower portion 62. This cavity consists of an upper cylindrical cavity 63 and a lower cavity or opening 66. There are locking means located within said cavity which comprise a set of cris-cross screws 74 adapted to be screwed into corresponding lhl~ded openings 64 formed within the lower portion 62 of chuck 12. Those openings 64 are directed inwardly upwardly under a predetermined angle.
Preferably but not necessqrily, this angle is about 20 degrees. The lower cavity or opening 66 has in cross-section a configuration corresponding to the configuration of the upper portion or head 68 of shank 23. As it shown on Fig. 13, the upper portion or head 68 has in cross-section a square-headed with bevelled corners 72 configuration. Sides 70 of said head 68 taper downwardly under a predetçrrn; led angle. The configuration ofthe lower portion of shank 23 and punch assembly is i~l~nticql to the first embodiment shown on Fig. 1 and will be not discussed in detail. It is also possible to make the upper portion of chuck 12 having configuration shown on Figs. 8 and 9 made as the plate 42 instead of stub 14.
In operation, the shank 23 is inserted into the upper cavity 63 through the opening 66 and is then turned axially within said cavity 63 at 45~; this is necessary to retain the shank 23 in place before c~trin~ of punch-holder is initiqted The c~ntring operation is similar to centring ofthe punch-holder of the first embodiment. Firstly, all four screws 74 should be loosened. Then, the punch can be centred with the die by means of lateral movement ofthe upper portion or head 68 within the cavity 63 in right-left and back-front positions, wherein corresponding set of cris-cross screws 74 are tightened. These screws 74 are adapted to cooperate with angled sides 70 ofthe head 68 not only to adjust and hold the shank 23 in a set position, but also to further lock said CA 02204973 1997-0~-09 shank 23 immobily within the upper cavity 63. This locking operation is provided by means of locking said screws 74 using locknuts 78. As a result, when screws 74 are gradually tightened, the upper portion or head 68 is forced upwardly until it abuts an inside face 76 ofthe chuck 12 and shank 23 is immobily locked in place.
The advantage ofthe second embodiment is the fact that this structure elimin~tes the necessity of using a fastener. Besides, since cavities 63 and 66 are much shorter than in the first mo~ific~tion this allows f~t~ning of products having higher sides.
The foregoing discloses and describes exemplary embodiments ofthe present invention.
One skilled in the art will readily recognize from such discussion and from the accompanying drawings that various changes, modifications and variations may be made therein without departing fromthe spirit and scope ofthe invention as defined in the following claims.
Claims (34)
1. Floating punch-holder comprising:
holding means having an upper portion and a lower portion, said holding means is adaptable to be attached to a punching apparatus;
shank means having an upper portion or head and a lower portion, the upper portion of said shank being held by said holding means;
punch means being connected to the lower portion of said shank means;
die means adapted to cooperate with said punch means;
said holding means is provided with an open-ended cavity formed at the lower portion of said holding means, said cavity being adapted to accommodate and immobily lock the upper portion or head of said shank means, wherein the upper portion of said shank means has a configuration and dimensions allowing easy and accurate adjustment of said shank means within said cavity in any position necessary for precise alignment and centring of said punch means with said die means, and wherein said adjustment is provided by means of lateral movement of the upper portion of said shank means within said cavity.
holding means having an upper portion and a lower portion, said holding means is adaptable to be attached to a punching apparatus;
shank means having an upper portion or head and a lower portion, the upper portion of said shank being held by said holding means;
punch means being connected to the lower portion of said shank means;
die means adapted to cooperate with said punch means;
said holding means is provided with an open-ended cavity formed at the lower portion of said holding means, said cavity being adapted to accommodate and immobily lock the upper portion or head of said shank means, wherein the upper portion of said shank means has a configuration and dimensions allowing easy and accurate adjustment of said shank means within said cavity in any position necessary for precise alignment and centring of said punch means with said die means, and wherein said adjustment is provided by means of lateral movement of the upper portion of said shank means within said cavity.
2. Floating punch-holder according to claim 1, wherein said holding means comprises a chuck means.
3. Floating punch-holder according to claim 2, wherein the upper portion of said chuck means is adapted to be securely attached to said punching apparatus.
4. Floating punch-holder according to claim 3, wherein said upper portion and said lower portion of said chuck means has a unitary or one-piece configuration.
5. Floating punch-holder according to claim 3, wherein said punch-holder further comprises:
an alignment means located within said cavity, said alignment means are adapted to cooperate with the upper portion or head of said shank means and to adjust and hold said shank means in a set position, and fastener means also located within said cavity, said fastener means are adapted to securely hold or fasten the upper portion of said shank means within said cavity in an immobile position without disturbing the alignment and centring of said punch means with said die means.
an alignment means located within said cavity, said alignment means are adapted to cooperate with the upper portion or head of said shank means and to adjust and hold said shank means in a set position, and fastener means also located within said cavity, said fastener means are adapted to securely hold or fasten the upper portion of said shank means within said cavity in an immobile position without disturbing the alignment and centring of said punch means with said die means.
6. Floating punch-holder according to claim 5, wherein said cavity has a configuration of a cylinder, said cylinder being extending upwardly from a bottom of the lower portion of said chuck means, and wherein said upper portion or head of said shank means has in cross-section a square-headed with rounded corners configuration, wherein said configuration is provided to facilitate easy positioning and adjustment of said shank means within said cavity during centring or aligning of said punch means with said die means.
7. Floating punch-holder according to claim 6, wherein said alignment means comprises a first set of cris-cross screws directed inwardly within said cavity, said screws being adapted to cooperate with corresponding sides of the upper portion of said shank means which allows to adjust said upper portion within said cavity in right-left or front-back directions during alignment of said punch means with said die means.
8. Floating punch-holder according to claim 5, wherein said fastener means further comprises:
tightening means located within said cavity and locking means also located within said cavity.
tightening means located within said cavity and locking means also located within said cavity.
9. Floating punch holder according to claim 8, wherein said tightening means comprises a thread formed around an outer wall of said fastener means, said thread adapted to cooperate with a corresponding thread formed within said cavity.
10. Floating punch-holder according to claim 8, wherein said locking means comprises a combination of an obtuse-angled groove formed around the outer wall of said fastener means and a second set of inwardly directed cris-cross screws located within said cavity, wherein said second set of screws is adapted to cooperate with said obtuse-angled groove by way of penetrating into said groove, thus forcing said fastener means upwardly to lock immobily the upper portion of said shank means within said cavity.
11. Floating punch-holder according to claim 10, wherein said groove comprises an upper edge and a lower edge, and wherein the upper edge of said groove is longer than the lower edge of said groove to facilitate successful locking of said shank means by said second set of cris-cross screws.
12. Floating punch-holder according to claim 10, wherein said groove is formed below the thread of said fastener means.
13. Floating punch-holder according to claim 3, wherein the upper portion of said chuck means comprises a plate.
14. Floating punch-holder according to claim 1, wherein said shank means has in cross-section a T-shaped configuration.
15. Floating punch-holder according to claim 3, wherein the upper portion of said chuck means has a configuration of upwardly extending flange or stub.
16. Floating punch-holder in combination with punching apparatus, said floating punch comprising:
holding means having upper portion and lower portion, said holding means is adaptable to be attached to a punching apparatus;
shank means having an upper portion or head and a lower portion, the upper portion of said shank being held by said holding means;
punch means being connected to the lower portion of said shank means;
die means adapted to cooperate with said punch means;
said holding means is provided with an open-ended cavity formed at the lower portion of said holding means, said cavity being adapted to accommodate and immobily lock the upper portion of said shank means, wherein the upper portion of said shank means has a configuration and dimensions allowing easy and accurate adjustment of said shank means within said cavity in any position necessary for precise alignment and centring of said punch means with said die means, and wherein said adjustment is provided by means of lateral movement of the upper portion of said shank means within said cavity.
holding means having upper portion and lower portion, said holding means is adaptable to be attached to a punching apparatus;
shank means having an upper portion or head and a lower portion, the upper portion of said shank being held by said holding means;
punch means being connected to the lower portion of said shank means;
die means adapted to cooperate with said punch means;
said holding means is provided with an open-ended cavity formed at the lower portion of said holding means, said cavity being adapted to accommodate and immobily lock the upper portion of said shank means, wherein the upper portion of said shank means has a configuration and dimensions allowing easy and accurate adjustment of said shank means within said cavity in any position necessary for precise alignment and centring of said punch means with said die means, and wherein said adjustment is provided by means of lateral movement of the upper portion of said shank means within said cavity.
17. Floating punch-holder according to claim 16, wherein said holding means comprises a chuck means.
18. Floating punch-holder according to claim 17, wherein said upper portion of said chuck means is adapted to be securely attached to said punching apparatus.
19. Floating punch-holder according to claim 18, wherein said upper portion and said lower portion of said chuck means has a unitary or one-piece configuration.
20. Floating punch-holder according to claim 16, wherein said punch-holder further comprises:
an alignment means located within said cavity, said alignment means are adapted to cooperate with the upper portion or head of said shank means and to adjust and hold said shank means in a set position, and fastener means also located within said cavity, said fastener means are adapted to securely hold or fasten the upper portion of said shank means within said cavity in immobile position without disturbing the alignment and centring of said punch means with said die means.
an alignment means located within said cavity, said alignment means are adapted to cooperate with the upper portion or head of said shank means and to adjust and hold said shank means in a set position, and fastener means also located within said cavity, said fastener means are adapted to securely hold or fasten the upper portion of said shank means within said cavity in immobile position without disturbing the alignment and centring of said punch means with said die means.
21. Floating punch-holder according to claim 20, wherein said cavity has a configuration of a cylinder, said cylinder being extending upwardly from a bottom of the lower portion of said chuck means, and wherein said upper portion or head of said shank means has in cross-section a square-headed with rounded corners configuration, wherein said configuration is provided to facilitate an easy positioning and adjustment of said shank means within said cavity during centring or aligning of said punch means with said die means.
22. Floating punch-holder according to claim 21, wherein said alignment means comprises a first set of cris-cross screws directed inwardly within said cavity, said screws being adapted to cooperate with corresponding sides of the upper portion of said shank means which allows to adjust said upper portion within said cavity in right-left or front-back directions during alignment of said punch means with said die means.
23. Floating punch-holder according to claim 20, wherein said fastener means further comprises:
tightening means located within said cavity and locking means also located within said cavity.
tightening means located within said cavity and locking means also located within said cavity.
24. Floating punch holder according to claim 23, wherein said tightening means comprises a thread formed around an outer wall of said fastener means, said thread adapted to cooperate with a corresponding thread formed within said cavity.
25. Floating punch-holder according to claim 24, wherein said locking means comprises a combination of an obtuse-angled groove formed around the outer wall of said fastener means and a second set of inwardly directed cris-cross screws located within said cavity, wherein said second set of screws is adapted to cooperate with said obtuse-angled groove by way of penetrating into said groove, thus forcing said fastener means upwardly to immobily lock the upper portion of said shank means within said cavity.
26. Floating punch-holder according to claim 25, wherein said groove comprises an upper edge and a lower edge, and wherein the upper edge of said groove is longer than the lower edge of said groove to facilitate successful locking of said shank means by said second set of cris-cross screws.
27. Floating punch-holder according to claim 25, wherein said groove is formed below the thread of said fastener means.
28. Floating punch-holder according to claim 17, wherein the upper portion of said chuck means comprises a plate.
29. Floating punch-holder according to claim 16, wherein said shank means has in cross-section a T-shaped configuration.
30. Floating punch-holder according to claim 17, wherein the upper portion of said chuck means has a configuration of an upwardly extending flange or stub.
31. Floating punch-holder according to claim 4, wherein said punch-holder further comprises a locking means located within said cavity, said locking means are adapted to cooperate with the upper portion or head of said shank means to adjust and hold said shank means in a set position and further to lock said shank means immobily within said cavity.
32. Floating punch-holder according to claim 31, wherein the upper portion or head of said shank means has in cross-section a square-headed with bevelled corners configuration, and wherein sides of said upper portion or head being tapered downwardly under predetermined angle which facilitate easy positioning and adjustment of said shank means within said cavity during centring of said punch means with said die means and further locking immobily the upper portion of said shank means within said cavity.
33. Floating punch-holder according to claim 32, wherein said locking means comprises a set of cris-cross screws directed inwardly upwardly within said cavity, said set of screws being adapted to cooperate with corresponding sides of the upper portion of said shank means to facilitate immobile locking of said shank means within said cavity by means of forcing upwardly the upper portion or head of said shank means within said cavity.
34. Floating punch-holder according to claim 33, wherein an opening portion or entrance of said cavity has in cross-section a configuration corresponding to the configuration of the upper portion or head of said shank means, and wherein positioning of said shank means within said cavity is provided by means of preliminary axial rotating of said shank means within said cavity at 45°
which facilitates proper positioning of sides of said upper portion or head against corresponding screws of said set of cris-cross screws and retaining of said shank means in place during positioning.
which facilitates proper positioning of sides of said upper portion or head against corresponding screws of said set of cris-cross screws and retaining of said shank means in place during positioning.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/649,111 | 1996-05-14 | ||
| US08/649,111 US5992285A (en) | 1994-11-21 | 1996-05-14 | Floating punch holder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2204973A1 CA2204973A1 (en) | 1997-11-14 |
| CA2204973C true CA2204973C (en) | 2002-02-19 |
Family
ID=24603507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002204973A Expired - Fee Related CA2204973C (en) | 1996-05-14 | 1997-05-09 | Floating punch holder |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2204973C (en) |
-
1997
- 1997-05-09 CA CA002204973A patent/CA2204973C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2204973A1 (en) | 1997-11-14 |
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Effective date: 20040510 |