US3043060A - Needle sharpening apparatus - Google Patents
Needle sharpening apparatus Download PDFInfo
- Publication number
- US3043060A US3043060A US849369A US84936959A US3043060A US 3043060 A US3043060 A US 3043060A US 849369 A US849369 A US 849369A US 84936959 A US84936959 A US 84936959A US 3043060 A US3043060 A US 3043060A
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- US
- United States
- Prior art keywords
- needle
- lap
- block
- disc
- spaced
- 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 - Lifetime
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
- B24B19/16—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding sharp-pointed workpieces, e.g. needles, pens, fish hooks, tweezers or record player styli
Definitions
- This invention relates to apparatus for sharpening or resharpening hypodermic needles and similar hollow needles which will be referred to collectively hereinafter as needles.
- Such a needle has a point formed on it primarily by producing on one end a flat or curved bevel surface oblique to the needle axis.
- the present invention relates to the surfacing or resurfacing of flat or concave bevels.
- the object of sharpening a hypodermic needle is to produce a sharp durable point on the end of the needle flanked by two sharp edges so that when the point of the needle penetrates the epidermis the edges will cut the skin and underlying tissue and permit the entry of the cannula without tearing of the tissue.
- a sharp edge is formed by the intersection at an appropriate angle of two smooth surfaces. If the surfaces are flat, the edge. formed by their intersection will be straight and if the surfaces are smooth the edge formed by their intersection will be free from serrations and similar imperfections.
- the point may be formed by the intersection at an appropriate angle of three or more' smooth surfaces. The point will be sharp and free from burrs if the intersections and surfaces forming it are smooth.
- a sharp point may also be formed by the intersection of a plane with a convex cylindrical surface.
- a needle of one or all of these types may be sharpened or resharpened by producing on it a new bevel surface which is very smooth all over and is free from burrs, turned edges or crumbled edges.
- any method of resharpening needles should reproduce accurately the form and angle of the original bevel angle if this is the optimum or that the bevel angle shall be adjustable at will.
- a finish of this type is conveniently achieved by lapping the surface on a suitable metal lap in which is embedded abrasive powder of a suitable hardness and particle size.
- the object of the present invention is to provide apparatus for sharpening or resharpening flat bevels more satisfactorily than is the case with existing apparatus for the purpose.
- Another object of this invention is to provide apparatus for the sharpening of needles which incorporates all of the above desirable features.
- the invention is needle sharpening apparatus including a rotatable lap having a working surface, a block supported on the said lap surface at spaced locations and spaced from the surface between said locations and having an associated abutment edge substantially parallel to a generator of the said surface of the lap and spaced from the said surface, the lap and abutment edge being adapted to receive between them a needle end to be bevelled and sharpened with the needle end bevel surface contacting the said lap surface and the needle outer surface adjacent to the end to be sharpened contacting the abutment edge, and means for guiding the needle, the disposition of the guide means in relation to the lap being such that the bevel produced on the needle 3,043,060 Patented July '10, 1962 ice end by contact between the needle end and the rotating lap surface has substantially the required angle with the needle axis.
- Means are provided for moving the engaging surfaces of the needle bevel and lap relatively so as to abrade the bevel surface.
- a lap disc 10 is located within and spaced from a shallow cylindrical wall 11. Conventional means (not shown) are provided for rotating the disc 10 about its centre. spaced from the disc 10 and supported at its ends on posts 12A. On the bar is slidably mounted a block carrier 13 with an extension 14 from which a block 15 is suspended by screws 16. The block is biased away from the carrier and against the disc 10 by springs 17 surrounding the respective screws 16. The block is supported on the disc by tungsten carbide underflats 18, one at each end, the part of the block between the underfiats being spaced from the disc 10.
- a bar 19 is adjustably secured to the face 20' of the block, between parallel wings 21 extending from the block, by screws 22 extending into the block through slots 23 in the bar 19.
- a comb plate 24 with spaced slots 25 is secured to and between the wing outer ends. Elongated holes may be substituted for the slots 25.
- the carrier 13 is reciprocated on the bar 12 by means of a connecting rod 26 pivoted at one end 27 to the carrier and at the other end 28, off-centre, to a disc 29 secured on the upper end of a rotatable shaft which may pass through a hole in the bar 12.
- the objects of the reciprocation of the carrier 13 and with it the block 15 is to distribute Wear as much as possible.
- the components so far described are supported on a table or platform 30 at an angle to the vertical approximately equal to the angle between the required bevel plane and the needle axis.
- the needles 31 to be sharpened are disposed vertically in the respective comb slots 25 with the bevel plane to be lapped engaging the disc and the outside of the needle near its point against the abutment edge 32 of the bar 19.
- the edge 32 is parallel to the disc surface.
- a pressing plate 33 is secured to an arm 34 passing at its outer end between posts 35.
- An extension 36 of therotatable shaft carrying the disc 10 is located off-centre in and secured to a disc 37;
- the function of the plate 33 is to distribute abrasive powder over the disc surface and to press it into the disc.
- the purpose of the grooves is to remove debris from the surface of the disc and to remove burrs from the edges of the needle bevel.
- a cylindrical lap disposed with its axis horizontal is employed.
- a guide bar 12 extends across parallel to and guided vertically, point downwards, with its pointed end between the lap and the abutment edge, the bevel engaging the lap surface and the opposite outer surface engaging the abutment edge.
- a composite lap' may be employed having both a cylindrical lap surface and a flat circular end lap surface. Either lap surface may then be used according to the bevel required. For both fiat and cylindrical laps rotation may be in either direction.
- Apparatus for sharpening a needle comprising a rotable lap, having a working surface, a block contacting said working surface at spaced locations, the block being spaced from said working surface between said locations, said block having an abutment edge substantially parallel to said working surface and spaced therefrom,.said working surface and abutment edge defining a support for said needle, the needle having a surface adaptedfor contacting the working surface so that the surface of the needle is beveled at a determinable angle, the needle having an outer surface adjacent the first said surface thereof and adapted to contact the abutment edge, andspaced guides above the abutment edge, each guide adapted for supporting said needle and cooperating with the abutment edge and the working surface of the lap to maintain the needle in a substantially upright position, the surface of the, lap which is adjacentlto the first said needle surface being inclined with respect to the vertical at an angle substantially equal to the angle of the beveled surface of the needle.
- Apparatus as in claim 1 including also means for feeding abrasive material onto the lap surface.
- the lap is a disc, and comprising a guide bar extending across and spaced from the lap surface, a block carrier mounted on the 7 guide bar, the block being attached to the block carrier and spaced from the lap surface for at least part of its length, spaced underflats on said carrier and supported on the lap surface, the abutment edge of the block being spaced from the lap surface.
- Apparatus as in claim 8 including means for urging the block underflats against the lap surface.
- Apparatus as in claim-8 including means for feeding abrasive material onto the lap surface.
- Apparatus as in claim 8 comprising spaced wings extending from the block adjacent to the respective ends of the abutment edge, the needle guiding means comprising a comb plate secured to the outer ends of the wings and extending therebetween, the comb plate havin ⁇ ; spaced slots, each adapted to support and guide said needle.
Description
July 10, 1962 G. A. BELL ETAL 3,043,060
3,043,060 NEEDLE SENING APPARATUS George Anketell Bell, West Pymble, New South Wales,
and James Lobb, Caringbah, New South Wales,
Australia, assignors to Commonwealth Scientific and Industrial Research Organization, East Melbourne,
Victoria, Australia, a body corporate of Australia Filed Oct. 28, 1959, Ser. No. 849,369 Claims priority, application Australia Oct. 30, 1958 18 Claims. (Cl. 51-122) This invention relates to apparatus for sharpening or resharpening hypodermic needles and similar hollow needles which will be referred to collectively hereinafter as needles.
Such a needle has a point formed on it primarily by producing on one end a flat or curved bevel surface oblique to the needle axis.
The present invention relates to the surfacing or resurfacing of flat or concave bevels.
The object of sharpening a hypodermic needle is to produce a sharp durable point on the end of the needle flanked by two sharp edges so that when the point of the needle penetrates the epidermis the edges will cut the skin and underlying tissue and permit the entry of the cannula without tearing of the tissue.
A sharp edge is formed by the intersection at an appropriate angle of two smooth surfaces. If the surfaces are flat, the edge. formed by their intersection will be straight and if the surfaces are smooth the edge formed by their intersection will be free from serrations and similar imperfections. The point may be formed by the intersection at an appropriate angle of three or more' smooth surfaces. The point will be sharp and free from burrs if the intersections and surfaces forming it are smooth.
A sharp point may also be formed by the intersection of a plane with a convex cylindrical surface.
A needle of one or all of these types may be sharpened or resharpened by producing on it a new bevel surface which is very smooth all over and is free from burrs, turned edges or crumbled edges.
It is desirable also that any method of resharpening needles should reproduce accurately the form and angle of the original bevel angle if this is the optimum or that the bevel angle shall be adjustable at will.
A finish of this type is conveniently achieved by lapping the surface on a suitable metal lap in which is embedded abrasive powder of a suitable hardness and particle size.
The object of the present invention is to provide apparatus for sharpening or resharpening flat bevels more satisfactorily than is the case with existing apparatus for the purpose.
Another object of this invention is to provide apparatus for the sharpening of needles which incorporates all of the above desirable features.
In a general form the invention is needle sharpening apparatus including a rotatable lap having a working surface, a block supported on the said lap surface at spaced locations and spaced from the surface between said locations and having an associated abutment edge substantially parallel to a generator of the said surface of the lap and spaced from the said surface, the lap and abutment edge being adapted to receive between them a needle end to be bevelled and sharpened with the needle end bevel surface contacting the said lap surface and the needle outer surface adjacent to the end to be sharpened contacting the abutment edge, and means for guiding the needle, the disposition of the guide means in relation to the lap being such that the bevel produced on the needle 3,043,060 Patented July '10, 1962 ice end by contact between the needle end and the rotating lap surface has substantially the required angle with the needle axis.
Means are provided for moving the engaging surfaces of the needle bevel and lap relatively so as to abrade the bevel surface.
A preferred form of the invention is shown in the accompanying drawing.
A lap disc 10 is located within and spaced from a shallow cylindrical wall 11. Conventional means (not shown) are provided for rotating the disc 10 about its centre. spaced from the disc 10 and supported at its ends on posts 12A. On the bar is slidably mounted a block carrier 13 with an extension 14 from which a block 15 is suspended by screws 16. The block is biased away from the carrier and against the disc 10 by springs 17 surrounding the respective screws 16. The block is supported on the disc by tungsten carbide underflats 18, one at each end, the part of the block between the underfiats being spaced from the disc 10.
A bar 19 is adjustably secured to the face 20' of the block, between parallel wings 21 extending from the block, by screws 22 extending into the block through slots 23 in the bar 19. A comb plate 24 with spaced slots 25 is secured to and between the wing outer ends. Elongated holes may be substituted for the slots 25. The carrier 13 is reciprocated on the bar 12 by means of a connecting rod 26 pivoted at one end 27 to the carrier and at the other end 28, off-centre, to a disc 29 secured on the upper end of a rotatable shaft which may pass through a hole in the bar 12.
The objects of the reciprocation of the carrier 13 and with it the block 15 is to distribute Wear as much as possible.
The components so far described are supported on a table or platform 30 at an angle to the vertical approximately equal to the angle between the required bevel plane and the needle axis. The needles 31 to be sharpened are disposed vertically in the respective comb slots 25 with the bevel plane to be lapped engaging the disc and the outside of the needle near its point against the abutment edge 32 of the bar 19. The edge 32 is parallel to the disc surface.
A pressing plate 33 is secured to an arm 34 passing at its outer end between posts 35.
An extension 36 of therotatable shaft carrying the disc 10 is located off-centre in and secured to a disc 37;
falls into the space between the disc 10 and the wall 11- and is removed through a pipe 41.
The function of the plate 33 is to distribute abrasive powder over the disc surface and to press it into the disc. The purpose of the grooves is to remove debris from the surface of the disc and to remove burrs from the edges of the needle bevel.
In a further form of the invention, for producing cylin drical instead of flat bevel surfaces, a cylindrical lap disposed with its axis horizontal is employed.
As before a block is provided with an abutment edge spaced from and substantially parallel to a generator of the cylindrical lap surface. Each needle is disposed and A guide bar 12 extends across parallel to and guided vertically, point downwards, with its pointed end between the lap and the abutment edge, the bevel engaging the lap surface and the opposite outer surface engaging the abutment edge.
Where it is required to sharpen or resharpen'needles, some with flat bevels and others with cylindrical bevels, a composite lap' may be employed having both a cylindrical lap surface and a flat circular end lap surface. Either lap surface may then be used according to the bevel required. For both fiat and cylindrical laps rotation may be in either direction.
What we claim is:
1. Apparatus for sharpening a needle comprising a rotable lap, having a working surface, a block contacting said working surface at spaced locations, the block being spaced from said working surface between said locations, said block having an abutment edge substantially parallel to said working surface and spaced therefrom,.said working surface and abutment edge defining a support for said needle, the needle having a surface adaptedfor contacting the working surface so that the surface of the needle is beveled at a determinable angle, the needle having an outer surface adjacent the first said surface thereof and adapted to contact the abutment edge, andspaced guides above the abutment edge, each guide adapted for supporting said needle and cooperating with the abutment edge and the working surface of the lap to maintain the needle in a substantially upright position, the surface of the, lap which is adjacentlto the first said needle surface being inclined with respect to the vertical at an angle substantially equal to the angle of the beveled surface of the needle.
2. Apparatus as in claim 1, including also means for feeding abrasive material onto the lap surface.
3. Apparatus as in claim 1, wherein the lap surface has grooves formed in it.
4. Apparatus as in claim 1, including means for biasing the block towards the lap surface.
5. Apparatus as in claim 1, including means for reciprocating the block over the lap surface.
6. Apparatus as in claim 1, wherein the lap is a disc.
7. App ratus as in claim 6, wherein the grooves are approximately radial.
8. Apparatus as in claim 1, wherein the lap is a disc, and comprising a guide bar extending across and spaced from the lap surface, a block carrier mounted on the 7 guide bar, the block being attached to the block carrier and spaced from the lap surface for at least part of its length, spaced underflats on said carrier and supported on the lap surface, the abutment edge of the block being spaced from the lap surface.
9. Apparatus as in claim 8, including means for urging the block underflats against the lap surface.
10. Apparatus as in claim 8, wherein the block carrier is slidably mounted on the guide bar and comprising means for reciprocating the carrier along the guide bar.
11. Apparatus as in claim-8, including means for feeding abrasive material onto the lap surface.
12. Apparatus as in claim 11, wherein the lap surface has grooves formed in it.
13. Apparatus as in claim 12, wherein the grooves are approximately radial.
14. Apparatus as in claim 11, including pressing means for pressing into the lap surface abrasive material fed thereon. J
15. Apparatus as in claim 14, wherein the pressing means comprises a pressing plate pressing against the lap surface.
16. Apparatus as in claim 15, including means for reciprocating the pressing plate over the lap surface.
17. Apparatus as in claim 8, comprising spaced wings extending from the block adjacent to the respective ends of the abutment edge, the needle guiding means comprising a comb plate secured to the outer ends of the wings and extending therebetween, the comb plate havin}; spaced slots, each adapted to support and guide said needle.
18. Apparatus as in claim 1, the abutment edge being on an abutment bar adjustably secured to the block.
References Cited in the file of this patent UNITED STATES PATENTS 670,593 Murnane Mar. 26, 1901 2,180,952 Gattoni Nov. 21, 1939 2,368,108- Bourgeois 19.11.30, 1945 2,404,282 Fruth July 16, 1946 2,663,976 'Jacoby Dec. 29, 1953 2,797,534 Rouse July 2, 1957 2,821,051 Franz Jan. 28, 1958 v FOREIGN PATENTS 9,233 Great Britain May 2, 1905
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU3043060X | 1958-10-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3043060A true US3043060A (en) | 1962-07-10 |
Family
ID=3838825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US849369A Expired - Lifetime US3043060A (en) | 1958-10-30 | 1959-10-28 | Needle sharpening apparatus |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3043060A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4237658A (en) * | 1979-01-26 | 1980-12-09 | Hargem Ltd. | Device for use in polishing table facets of gems |
| WO1986003154A1 (en) * | 1984-11-28 | 1986-06-05 | Charrette | Blade point sharpener |
| US4643161A (en) * | 1984-07-05 | 1987-02-17 | Kim George A | Method of machining hard and brittle material |
| US5186402A (en) * | 1992-01-21 | 1993-02-16 | Lin Yung Jyi | Injection needle disposal device |
| US5564871A (en) * | 1994-06-16 | 1996-10-15 | Lagsdin; Andry | Chamfer machine |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US670593A (en) * | 1899-09-27 | 1901-03-26 | Nat Mercury Mirror Company | Grinding or polishing disk. |
| GB190509233A (en) * | 1905-05-02 | 1905-06-15 | William Phillips Thompson | Improvements in Apparatus for Pointing Animal Hairs. |
| US2180952A (en) * | 1938-02-10 | 1939-11-21 | Seederer Kohlbusch Inc | Apparatus for sharpening knifeedges |
| US2368108A (en) * | 1944-01-25 | 1945-01-30 | George A Bourgeois | Abrading machine |
| US2404282A (en) * | 1944-04-24 | 1946-07-16 | Galvin Mfg Corp | Apparatus for making piezoelectric crystals |
| US2663976A (en) * | 1949-11-30 | 1953-12-29 | Jr George W Jacoby | Device for sharpening hypodermic needles and other instruments |
| US2797534A (en) * | 1954-10-27 | 1957-07-02 | Bryant A Rouse | Hair clipper plate grinder |
| US2821051A (en) * | 1955-02-10 | 1958-01-28 | Franz Frederick | Sharpener for hypodermic needles |
-
1959
- 1959-10-28 US US849369A patent/US3043060A/en not_active Expired - Lifetime
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US670593A (en) * | 1899-09-27 | 1901-03-26 | Nat Mercury Mirror Company | Grinding or polishing disk. |
| GB190509233A (en) * | 1905-05-02 | 1905-06-15 | William Phillips Thompson | Improvements in Apparatus for Pointing Animal Hairs. |
| US2180952A (en) * | 1938-02-10 | 1939-11-21 | Seederer Kohlbusch Inc | Apparatus for sharpening knifeedges |
| US2368108A (en) * | 1944-01-25 | 1945-01-30 | George A Bourgeois | Abrading machine |
| US2404282A (en) * | 1944-04-24 | 1946-07-16 | Galvin Mfg Corp | Apparatus for making piezoelectric crystals |
| US2663976A (en) * | 1949-11-30 | 1953-12-29 | Jr George W Jacoby | Device for sharpening hypodermic needles and other instruments |
| US2797534A (en) * | 1954-10-27 | 1957-07-02 | Bryant A Rouse | Hair clipper plate grinder |
| US2821051A (en) * | 1955-02-10 | 1958-01-28 | Franz Frederick | Sharpener for hypodermic needles |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4237658A (en) * | 1979-01-26 | 1980-12-09 | Hargem Ltd. | Device for use in polishing table facets of gems |
| US4643161A (en) * | 1984-07-05 | 1987-02-17 | Kim George A | Method of machining hard and brittle material |
| WO1986003154A1 (en) * | 1984-11-28 | 1986-06-05 | Charrette | Blade point sharpener |
| US5186402A (en) * | 1992-01-21 | 1993-02-16 | Lin Yung Jyi | Injection needle disposal device |
| US5564871A (en) * | 1994-06-16 | 1996-10-15 | Lagsdin; Andry | Chamfer machine |
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