CA1230763A - Combination bit and manufacturing technique for forming disc-shaped plugs - Google Patents
Combination bit and manufacturing technique for forming disc-shaped plugsInfo
- Publication number
- CA1230763A CA1230763A CA000474049A CA474049A CA1230763A CA 1230763 A CA1230763 A CA 1230763A CA 000474049 A CA000474049 A CA 000474049A CA 474049 A CA474049 A CA 474049A CA 1230763 A CA1230763 A CA 1230763A
- Authority
- CA
- Canada
- Prior art keywords
- face
- inverted cup
- plug
- combination bit
- cutting
- 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
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/04—Drills for trepanning
- B23B51/0453—Drills for trepanning with ejecting devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/50—Drilling tools comprising cutting inserts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A novel combination bit as well as novel manufacturing technique are provided herein. The bit is specially designed to form, in a single operation, a substantially cylindrical plug having a central aperture, and complex rounded faces consisting of a cylindrical face and a coextensive frusto-conical face. The combination bit includes an arbor and a blade arrangement in the form of an inverted cup secured to the arbor. The in-verted cup has an upper plate and a depending rim, the depending rim of the inverted cup being provided with a small plurality of cutting teeth equally spaced therearound. Each cutting tooth has a swept-back forward edge, and a swept-back trailing edge. Each cutting tooth has a lower cutting face of sufficient depth to provide a cylindrical face of the desired height on the plug formed, and an upper cutting face of sufficient size disposed on the forward edge to provide a frusto-conical face of the desired height on the plug being formed. A central bit is concentrically disposed within the inverted cup and is secured to the upper plate of the cup to provide the central aperture in the plug being formed. The novel manufacturing technique involves cutting out the plug of the particular shape which may have a dia-meter ranging from 1" to 24" in a single step using the novel combination bit.
A novel combination bit as well as novel manufacturing technique are provided herein. The bit is specially designed to form, in a single operation, a substantially cylindrical plug having a central aperture, and complex rounded faces consisting of a cylindrical face and a coextensive frusto-conical face. The combination bit includes an arbor and a blade arrangement in the form of an inverted cup secured to the arbor. The in-verted cup has an upper plate and a depending rim, the depending rim of the inverted cup being provided with a small plurality of cutting teeth equally spaced therearound. Each cutting tooth has a swept-back forward edge, and a swept-back trailing edge. Each cutting tooth has a lower cutting face of sufficient depth to provide a cylindrical face of the desired height on the plug formed, and an upper cutting face of sufficient size disposed on the forward edge to provide a frusto-conical face of the desired height on the plug being formed. A central bit is concentrically disposed within the inverted cup and is secured to the upper plate of the cup to provide the central aperture in the plug being formed. The novel manufacturing technique involves cutting out the plug of the particular shape which may have a dia-meter ranging from 1" to 24" in a single step using the novel combination bit.
Description
~230763 This invention relates to d combination bit and manufacturing technique to produce, tn a single operation, end plugs for a paper spool.
Such end plugs each have a central aperture and peripheral faces, a major portion of which are cylindrical, and a minor portion of which are frusto-conical.
The art is replete with patents for circular hole cutters which provide, simultaneously, two concentric apertures in a sheet material, where the object is to provide a large diameter hole in the sheet material. Among such patents are the following:
U.S. Patent 2,803,153 paten~ed August 20, 1957 by B.J. Goldbeck U.S. Patent 2,926,555 patented March 1, ]960 by A.R. Joy U.S. Patent 3,559,513 patented February 2, 1971 by E.D. Hougen U.S. Patent 3,778,179 patented December 11, 1973 by D.F. Rivas U.S. Patent 4,077,737 patented March 7, 1978 by M.K. Morse Canadian Patent 7.73,879 patented December, 1967 by J.W. Goodyear and Canadian Patent 843,069 patented June 2, 1970 by G. Val.
However, the art has not taught the provision of such a cutting tool where the aim is the provision and retention of a plug removed from the sheet material, rather than the provision of a hble in such sheet material, where the removed mataerial is discarded.
Accordingly it is an object of a broad aspect of this invention to provide a tool for the provision of a substantially cylindrical plug which is provided with a central aperture and whose rounded faces are in the form of a comp~ex shape having a cylindrical portion and a frusto-conical portion.
An object of another aspect of this invention is the provision of ; a novel manufacturing technique to produce such plugs, which may have diame-ters from 1 inch to 24 inches, in a single step.
By one broad aspect of this invention, a combination bit is pro-vided for producing, in a single operation, a substantially cylindrical plug ,i 1 ~
having a central aperture, and complex rounded faces consisting of a cylin-crical face and a coextensive frusto-conical face, the combination bit com-prising: (a) an arbor; (b) a blade arrangement in the form of an inverted cup secured to the arbor, the inverted cup having an upper plate and a de-pending rim of the inverted cup being provided with a small plurality of cutting teeth equally spaced therearound, each cutting tooth having a swept-back forward edge, and a swept-back trailing edge, the cutting tooth having a lower cutting face of sufficient depth to provide a cylindrical face of the desired height on the plug formed, and an upper cutting face of suf-ficient size disposed on the forward edge to provide a frusto-conical face of the desired height on the plug being formed; and ~c) a central bit con-centrically disposed within the inverted cup, and secured to the upper plate of the inverted cup, to provide the central aperture in the plug being formed.
The bit so described may also include a changeable extractor plate concentrically disposed on.the arbor above the inverted cup, the extractor plate having means to secure the plate both to the arbor and to the inverted cup. Preferably, the means to secure the plate to the inverted cup may in-clude a plurality of circumferentially spaced vertical extending, rods. The number of rods preferably is three, and the rods preferably are secured in the extractor plate by means of screws engaged through the side face of the extractor plate into a respective through aperture within which ~he rod is disposed. Still more preferably, such means may include a stub shaft secured to the arbor and extending between the extractor plate and the inverted cup, the extractor plate being concentrically disposed on the stub shaft.
The arbor may be in the form of a Morse taper shaft, preferably terminating in a substantially cylindrical stub shaft. In such case the cen-tral bit is secured within a lower central aperture in the stub shaft.
Preferably, nine cutting teeth are provided on the inverted cup, the leading edge of each of the teeth being swept-back by 15, the lower cut-
Such end plugs each have a central aperture and peripheral faces, a major portion of which are cylindrical, and a minor portion of which are frusto-conical.
The art is replete with patents for circular hole cutters which provide, simultaneously, two concentric apertures in a sheet material, where the object is to provide a large diameter hole in the sheet material. Among such patents are the following:
U.S. Patent 2,803,153 paten~ed August 20, 1957 by B.J. Goldbeck U.S. Patent 2,926,555 patented March 1, ]960 by A.R. Joy U.S. Patent 3,559,513 patented February 2, 1971 by E.D. Hougen U.S. Patent 3,778,179 patented December 11, 1973 by D.F. Rivas U.S. Patent 4,077,737 patented March 7, 1978 by M.K. Morse Canadian Patent 7.73,879 patented December, 1967 by J.W. Goodyear and Canadian Patent 843,069 patented June 2, 1970 by G. Val.
However, the art has not taught the provision of such a cutting tool where the aim is the provision and retention of a plug removed from the sheet material, rather than the provision of a hble in such sheet material, where the removed mataerial is discarded.
Accordingly it is an object of a broad aspect of this invention to provide a tool for the provision of a substantially cylindrical plug which is provided with a central aperture and whose rounded faces are in the form of a comp~ex shape having a cylindrical portion and a frusto-conical portion.
An object of another aspect of this invention is the provision of ; a novel manufacturing technique to produce such plugs, which may have diame-ters from 1 inch to 24 inches, in a single step.
By one broad aspect of this invention, a combination bit is pro-vided for producing, in a single operation, a substantially cylindrical plug ,i 1 ~
having a central aperture, and complex rounded faces consisting of a cylin-crical face and a coextensive frusto-conical face, the combination bit com-prising: (a) an arbor; (b) a blade arrangement in the form of an inverted cup secured to the arbor, the inverted cup having an upper plate and a de-pending rim of the inverted cup being provided with a small plurality of cutting teeth equally spaced therearound, each cutting tooth having a swept-back forward edge, and a swept-back trailing edge, the cutting tooth having a lower cutting face of sufficient depth to provide a cylindrical face of the desired height on the plug formed, and an upper cutting face of suf-ficient size disposed on the forward edge to provide a frusto-conical face of the desired height on the plug being formed; and ~c) a central bit con-centrically disposed within the inverted cup, and secured to the upper plate of the inverted cup, to provide the central aperture in the plug being formed.
The bit so described may also include a changeable extractor plate concentrically disposed on.the arbor above the inverted cup, the extractor plate having means to secure the plate both to the arbor and to the inverted cup. Preferably, the means to secure the plate to the inverted cup may in-clude a plurality of circumferentially spaced vertical extending, rods. The number of rods preferably is three, and the rods preferably are secured in the extractor plate by means of screws engaged through the side face of the extractor plate into a respective through aperture within which ~he rod is disposed. Still more preferably, such means may include a stub shaft secured to the arbor and extending between the extractor plate and the inverted cup, the extractor plate being concentrically disposed on the stub shaft.
The arbor may be in the form of a Morse taper shaft, preferably terminating in a substantially cylindrical stub shaft. In such case the cen-tral bit is secured within a lower central aperture in the stub shaft.
Preferably, nine cutting teeth are provided on the inverted cup, the leading edge of each of the teeth being swept-back by 15, the lower cut-
- 2 -~230763 Ling face being provided with a 30 cutting edge, and the upper cutting edge being provided with an auxiliary cutting tooth canted at an angle of 2 .
The upper plate may preferably be provided with three finger ho]es.
By another aspect of this invention, a method is provided for pro-ducing, in a single operation, a substantially cylindrical plug having a central aperture, and complex rounded faces consisting of a cylindrical face and a coextensive frusto-conical face, the method comprising: (A) providing a combination bit in the form of an arbor; a blade arrangement in the form of an inverted cup secured to the arbor, the inverted cup having an upper plate and a depending rim, the depending rim of the inverted cup being provided with a small plurality of cutting teeth equally spaced therearound, each cutting too~h having a swept-back forward edge, and a swept-back trailing edge, the cutting tooth having a lower cutting face of sufficient depth to provide a cylindrical face of the desired height on the plug formed, and an upper cutting face of sufficient size disposed on the forward edge to pro-vide a frusto-conical face of the desired height on the plug being formed;
and a central bit concentrically disposed within the inverted cup, and secured to the upper plate of the inverted,cup, to provide the central aperture in plug being formed; (B) rotating the combination bit and applying it to a sheet material; and (C) providing and recovering a plug provided with a cen-tral bore and a complex curved face defined by a cylindrical piston and a mer8ed frusto-conical portion.
The sheet material preferably is pressed wooden boaord, to provide wooden plugs which may have a diameater of from 1" to 24".
In the accompanying drawings, Figure 1 is a side elevational view of the combination bit of one embodiment of this invention;
Figure 2 is a section along the line II-II of Figure l;
123~7~i3 Figure 3 is section along the line III-III of Figure l; and Figure 4 is a longitudinal section through a cylindrical plug pro-duced by the use of the combination bit of an embodiment of this inventic.n.
Referring firstly to Figures 1-3, as seen in Figure 1, the combina-tion bit 10 of this embodiment of the present invention includes an arbor 11, a movable extractor plate 12 and an inverted cup 13 secured to the arbor 11.
The arbor 11 has an upper shaft 14 in the form of a Morse taper shaft ter-minating in a cylindrical stem 14a for insertion into a s~andard chuck of a driil press (not shown). The arbor 11 extends to an integral lower stub shaft 15 provided with a lower tapped bore 16 into which a central bit J7 is secured in the usua] manner.
The changeable extractor plate ]2 includes a central bore 18 by means of which it is mounted and centered on the stub shaft 15. The ex-tractor plate 12 is secured to the inverted cup 13 by means of a plurality of rods 19, i.e. three rods. ~Each rod 19 is secured within a respective axial bore 20 by means of a set screw 21 mounted in tapped radial bore 22.
The inverted cup 13 is provided with a depending cylindrical rim 23 provided with a small plurality of cutting members 24, e.g. nine. Each cutting member 24 includes a swept-back leading edge 25, preferably swept-back at an angle of 15 , and a swept-back trailing edge 26. The lower face 27 of each cutting member 24 is provided with a cutting surface 28, preferably s]oped at a cutting angle of 30 . The width of cutttng surface 28 is selected to be equal to the height of the cylindrical face of the plug being fomred, which will be described hereinafter with reference to Figure 4. The leading edge 25 is provided with a cutting face 29 and an auxiliary tooth 30, whose cutting face is canted at an angle of 2 . Cutting tooth 30 is of sufficient widLh to provide the frusto-conical face of the plug being formed.
4 , 1230~763 The inverted cupl3 is also provided with axial bores 31 which accomodate rods 19 to secure the changeable extractor plate 12 to the inverted cup 13. Each rod l9 is secured within a respective axial bore 31 by means of a set screw 32 mounted on d tapped radial bore 33.
Also provided on the upper plate 34 of the inverted cup 13 are a plurality of upstanding control rods 35 and depending from the lower surface of the upper plate 34 is a lower support disc 36.
The view in Figure 2 is self explanatory, given the description of Figure 1, with the only added explanation needed being that the apertures 20 are preferably disposed 120 apart.
As seen in Figure 3, ~he apertures 31 for the placement of rods 19 are disposed 120 apart to align with apertures 20 (see Figures 1 and 2).
The rods are likewise set 120 apart, but'offser from the apertures 31 both radially and circumferentially. Also provided are three finger holes 36, spaced 120 apart and offset from the other apertures 31 both circumferentially . . .
and radially and from rods 35 circumferentially.
Figure 4 shows one embodiment of a plug formed in a singie step from a sheet materi.;l, i.e. pressed board, using the combination bit of an embodiment of thls invention. It consists of a wooden plug 100 provided with a central bore lOl and a complex curved face defined by a cylindrical por-tion 102 and a merged frusto-conical portion 103.
The combination bit of embodimenLs of thc inventioll may be pro-vided by various ~iameters of the invertec cup and depending saw-tooth rim, various diameters of the coaxial bit, and variou, small numbers and heights of the composite cutting memDerS, to provide plugs of the desired size, e.g.
L rom I ~ to 24".
The upper plate may preferably be provided with three finger ho]es.
By another aspect of this invention, a method is provided for pro-ducing, in a single operation, a substantially cylindrical plug having a central aperture, and complex rounded faces consisting of a cylindrical face and a coextensive frusto-conical face, the method comprising: (A) providing a combination bit in the form of an arbor; a blade arrangement in the form of an inverted cup secured to the arbor, the inverted cup having an upper plate and a depending rim, the depending rim of the inverted cup being provided with a small plurality of cutting teeth equally spaced therearound, each cutting too~h having a swept-back forward edge, and a swept-back trailing edge, the cutting tooth having a lower cutting face of sufficient depth to provide a cylindrical face of the desired height on the plug formed, and an upper cutting face of sufficient size disposed on the forward edge to pro-vide a frusto-conical face of the desired height on the plug being formed;
and a central bit concentrically disposed within the inverted cup, and secured to the upper plate of the inverted,cup, to provide the central aperture in plug being formed; (B) rotating the combination bit and applying it to a sheet material; and (C) providing and recovering a plug provided with a cen-tral bore and a complex curved face defined by a cylindrical piston and a mer8ed frusto-conical portion.
The sheet material preferably is pressed wooden boaord, to provide wooden plugs which may have a diameater of from 1" to 24".
In the accompanying drawings, Figure 1 is a side elevational view of the combination bit of one embodiment of this invention;
Figure 2 is a section along the line II-II of Figure l;
123~7~i3 Figure 3 is section along the line III-III of Figure l; and Figure 4 is a longitudinal section through a cylindrical plug pro-duced by the use of the combination bit of an embodiment of this inventic.n.
Referring firstly to Figures 1-3, as seen in Figure 1, the combina-tion bit 10 of this embodiment of the present invention includes an arbor 11, a movable extractor plate 12 and an inverted cup 13 secured to the arbor 11.
The arbor 11 has an upper shaft 14 in the form of a Morse taper shaft ter-minating in a cylindrical stem 14a for insertion into a s~andard chuck of a driil press (not shown). The arbor 11 extends to an integral lower stub shaft 15 provided with a lower tapped bore 16 into which a central bit J7 is secured in the usua] manner.
The changeable extractor plate ]2 includes a central bore 18 by means of which it is mounted and centered on the stub shaft 15. The ex-tractor plate 12 is secured to the inverted cup 13 by means of a plurality of rods 19, i.e. three rods. ~Each rod 19 is secured within a respective axial bore 20 by means of a set screw 21 mounted in tapped radial bore 22.
The inverted cup 13 is provided with a depending cylindrical rim 23 provided with a small plurality of cutting members 24, e.g. nine. Each cutting member 24 includes a swept-back leading edge 25, preferably swept-back at an angle of 15 , and a swept-back trailing edge 26. The lower face 27 of each cutting member 24 is provided with a cutting surface 28, preferably s]oped at a cutting angle of 30 . The width of cutttng surface 28 is selected to be equal to the height of the cylindrical face of the plug being fomred, which will be described hereinafter with reference to Figure 4. The leading edge 25 is provided with a cutting face 29 and an auxiliary tooth 30, whose cutting face is canted at an angle of 2 . Cutting tooth 30 is of sufficient widLh to provide the frusto-conical face of the plug being formed.
4 , 1230~763 The inverted cupl3 is also provided with axial bores 31 which accomodate rods 19 to secure the changeable extractor plate 12 to the inverted cup 13. Each rod l9 is secured within a respective axial bore 31 by means of a set screw 32 mounted on d tapped radial bore 33.
Also provided on the upper plate 34 of the inverted cup 13 are a plurality of upstanding control rods 35 and depending from the lower surface of the upper plate 34 is a lower support disc 36.
The view in Figure 2 is self explanatory, given the description of Figure 1, with the only added explanation needed being that the apertures 20 are preferably disposed 120 apart.
As seen in Figure 3, ~he apertures 31 for the placement of rods 19 are disposed 120 apart to align with apertures 20 (see Figures 1 and 2).
The rods are likewise set 120 apart, but'offser from the apertures 31 both radially and circumferentially. Also provided are three finger holes 36, spaced 120 apart and offset from the other apertures 31 both circumferentially . . .
and radially and from rods 35 circumferentially.
Figure 4 shows one embodiment of a plug formed in a singie step from a sheet materi.;l, i.e. pressed board, using the combination bit of an embodiment of thls invention. It consists of a wooden plug 100 provided with a central bore lOl and a complex curved face defined by a cylindrical por-tion 102 and a merged frusto-conical portion 103.
The combination bit of embodimenLs of thc inventioll may be pro-vided by various ~iameters of the invertec cup and depending saw-tooth rim, various diameters of the coaxial bit, and variou, small numbers and heights of the composite cutting memDerS, to provide plugs of the desired size, e.g.
L rom I ~ to 24".
Claims (17)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A combination bit for producing, in a single operation, a sub-stantially cylindrical plug having a central aperture, and complex rounded faces consisting of a cylindrical face and a coextensive frusto-conical face, said combination bit comprising:
(a) an arbor;
(b) a blade arrangement in the form of an inverted cup secured to said arbor, said inverted cup having an upper plate and a depending rim, said depending rim of said inverted cup being provided with a small plurality of cutting teeth equally spaced therearound, each said cutting tooth having a swept-back forward edge, and a swept-back trailing edge, the cutting tooth having a lower cutting face of sufficient depth to provide a cylindrical face of the desired height on the plug formed, and an upper cutting face of sufficient size disposed on the forward edge to provide a frusto-conical face of the desired height on the plug being formed; and (c) a central bit concentrically disposed within the inverted cup, and secured to said upper plate of said inverted cup, to provide said central aperture in said plug being formed.
(a) an arbor;
(b) a blade arrangement in the form of an inverted cup secured to said arbor, said inverted cup having an upper plate and a depending rim, said depending rim of said inverted cup being provided with a small plurality of cutting teeth equally spaced therearound, each said cutting tooth having a swept-back forward edge, and a swept-back trailing edge, the cutting tooth having a lower cutting face of sufficient depth to provide a cylindrical face of the desired height on the plug formed, and an upper cutting face of sufficient size disposed on the forward edge to provide a frusto-conical face of the desired height on the plug being formed; and (c) a central bit concentrically disposed within the inverted cup, and secured to said upper plate of said inverted cup, to provide said central aperture in said plug being formed.
2. The combination bit of claim 1 including a changeable extractor plate concentrically disposed on said arbor above said inverted cup, said extractor plate having means to secure said plate both to said arbor and to said inverted cup.
3. The combination bit of claim 2 wherein said means to secure said extractor plate to said inverted cup includes a plurality of circum-ferentially spaced vertical extending, rods.
4. The combination bit of claim 3 wherein three such rods are provided.
5. The combination bit of claim 4 wherein said rods are secured in said extractor plate by means of screws engaged through the side face of said extractor plate into a respective through aperture within which said rod is disposed.
6. The combination bit of claims 2 or 3 wherein said means to secure said plate to said arbor includes a stub shaft secured to said arbor and extending between said extractor plate and said inverted cup, said ex-tractor plate being concentrically disposed on said stub shaft.
7. The combination bit of claim 1 wherein said arbor is in the form of a Morse taper shaft.
8. The combination bit of claim 7 wherein said Morse taper shaft terminates in a substantially cylindrical stub shaft.
9. The combination bit of claim 8 wherein said central bit is secured within a lower central aperture in said stub shaft.
10. The combination bit of claim 1 wherein nine cutting teeth are provided.
11. The combination bit of claim 10 wherein the leading edge of each of said teeth is swept back by 15°.
12. The combination bit of claim 10 wherein the lower cutting face of each said teeth is provided with a 30° cutting edge.
13. The combination bit of claim 10 wherein the upper cutting face of each of said teeth is provided with an auxiliary cutting tooth canted at an angle of 2°.
14. The combination bit of claim 1 wherein the upper plate of the inverted cup is provided with three finger holes.
15. A method for producing, in a single operation, a substantially cylindrical plug having a central aperture, and complex rounded faces con-sisting of a cylindrical face and a coextensive frusto-conical face, said method comprising:
(A) providing a combination bit in the form of an arbor; a blade arrangement in the form of an inverted cup secured to said arbor, said inverted cup having an upper plate and a depending rim, said depending rim of said inverted cup being provided with a small plurality of cutting teeth equally spaced therearound, each said cutting tooth having a swept-back for-ward edge, and a swept-back trailing edge, the cutting tooth having a lower cutting face of sufficient depth to provide a cylindrical face of the desired height on the plug formed, and an upper cutting face of sufficient size disposed on the forward edge to provide a frusto-conical face of the desired height on the plug being formed; and a central bit concentrically disposed within the inverted cup, and secured to said upper plate of said inverted cup, to provide said central aperture in said plug being formed;
(B) rotating said combination bit and applying it to a sheet material; and (C) providing and recovering a plug provided with a central bore and a complex curved face defined by a cylindrical portion and a merged frusto-conical portion.
(A) providing a combination bit in the form of an arbor; a blade arrangement in the form of an inverted cup secured to said arbor, said inverted cup having an upper plate and a depending rim, said depending rim of said inverted cup being provided with a small plurality of cutting teeth equally spaced therearound, each said cutting tooth having a swept-back for-ward edge, and a swept-back trailing edge, the cutting tooth having a lower cutting face of sufficient depth to provide a cylindrical face of the desired height on the plug formed, and an upper cutting face of sufficient size disposed on the forward edge to provide a frusto-conical face of the desired height on the plug being formed; and a central bit concentrically disposed within the inverted cup, and secured to said upper plate of said inverted cup, to provide said central aperture in said plug being formed;
(B) rotating said combination bit and applying it to a sheet material; and (C) providing and recovering a plug provided with a central bore and a complex curved face defined by a cylindrical portion and a merged frusto-conical portion.
16. The method of claim 15 wherein the sheet material is a pressed wooden board.
17. The method of claim 16 wherein the plug formed has a diameter from 1" to 24".
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000474049A CA1230763A (en) | 1985-02-11 | 1985-02-11 | Combination bit and manufacturing technique for forming disc-shaped plugs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000474049A CA1230763A (en) | 1985-02-11 | 1985-02-11 | Combination bit and manufacturing technique for forming disc-shaped plugs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1230763A true CA1230763A (en) | 1987-12-29 |
Family
ID=4129815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000474049A Expired CA1230763A (en) | 1985-02-11 | 1985-02-11 | Combination bit and manufacturing technique for forming disc-shaped plugs |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1230763A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999002292A1 (en) * | 1997-07-09 | 1999-01-21 | Siegmund Krieg | Compass saw device with ejector facility |
| CN105478863A (en) * | 2015-12-18 | 2016-04-13 | 天津卓达管道机械制造有限公司 | Cylindrical cutter for cutting stainless steel pipes |
| US20210008649A1 (en) * | 2010-01-13 | 2021-01-14 | Black & Decker Inc. | Hole cutter with chip egress aperture |
| CN112334257A (en) * | 2018-07-26 | 2021-02-05 | 株式会社宫永 | Core cutter and cutting method using same |
| US12036617B2 (en) | 2010-01-13 | 2024-07-16 | Black & Decker Inc. | Hole cutter with multiple fulcrums |
-
1985
- 1985-02-11 CA CA000474049A patent/CA1230763A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999002292A1 (en) * | 1997-07-09 | 1999-01-21 | Siegmund Krieg | Compass saw device with ejector facility |
| US20210008649A1 (en) * | 2010-01-13 | 2021-01-14 | Black & Decker Inc. | Hole cutter with chip egress aperture |
| US12036617B2 (en) | 2010-01-13 | 2024-07-16 | Black & Decker Inc. | Hole cutter with multiple fulcrums |
| CN105478863A (en) * | 2015-12-18 | 2016-04-13 | 天津卓达管道机械制造有限公司 | Cylindrical cutter for cutting stainless steel pipes |
| CN112334257A (en) * | 2018-07-26 | 2021-02-05 | 株式会社宫永 | Core cutter and cutting method using same |
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