CA1200996A - Plastic spectacle frame - Google Patents
Plastic spectacle frameInfo
- Publication number
- CA1200996A CA1200996A CA000419179A CA419179A CA1200996A CA 1200996 A CA1200996 A CA 1200996A CA 000419179 A CA000419179 A CA 000419179A CA 419179 A CA419179 A CA 419179A CA 1200996 A CA1200996 A CA 1200996A
- Authority
- CA
- Canada
- Prior art keywords
- bead
- rim member
- lens
- rim
- annular groove
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C1/00—Assemblies of lenses with bridges or browbars
- G02C1/06—Bridge or browbar secured to or integral with closed rigid rims for the lenses
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C1/00—Assemblies of lenses with bridges or browbars
- G02C1/10—Special mounting grooves in the rim or on the lens
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Ophthalmology & Optometry (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
Abstract
\
Abstract of the Disclosure In a spectacle frame made of plastic ma-terial, each lens of the spectacle is adapted to be held in a closed annular rim member by means of a bead which is fitted in an annular groove. The thickness of the rim member can be greatly reduced because the bead constitutes a closed annulus, which surrounds the rim member and has on at least one side of the rim member an inclined ramp surface. The annular groove is formed in each lens.
Abstract of the Disclosure In a spectacle frame made of plastic ma-terial, each lens of the spectacle is adapted to be held in a closed annular rim member by means of a bead which is fitted in an annular groove. The thickness of the rim member can be greatly reduced because the bead constitutes a closed annulus, which surrounds the rim member and has on at least one side of the rim member an inclined ramp surface. The annular groove is formed in each lens.
Description
This invention relates to a spectacle frame which is made of plastic material and comprises for each lens a closed rim member ~hich is adapted to be connected to the lens by a bead fitted into an annular groove.
Spectacle frames made of plastic material comprise for each lens a closed annular rim member formed with an annular groove for recEiving a bead formed on the lsns. The resilience of the plastic material of the rim member and the possibility to change the properties of 0 its material are utili~ed to secure the lenses in the rim members. The rim members condining the lenses ensure a reliable fixation of the lenses and the lat er impart an adequate stiffness to the rim members and to the en-tire spectacle frame. ~ut the cross-se~tiona~ area and the chickness of the rim membsr made of plastic material must be above respective lower limits so that spectacle frames made of plastic material have a relatively large thickness, which is undesirable as regards appearance and weight in many cases.
To avoid the use of closed annular rim mem-bers for holding lenses of spectacles~ it is known par-ticularly in spectacles having metal frames to hold the lenses in a half frame having no lower rim portion and comprising a cord~ which replaces the lower rim portion of th0 frameO That cord is substantially ~nvisible be-cause it is insertad into a groove formed in each lensO
A disadvantage of that design resides in that it is dif-ficult to tension the cord and that the cord, which is connected to the half frame adjacent to the bridge and atthe portion to which the bows are connected~ cannot ;; i~
contribute to the torsional streng~h of the frame so that a distortion of the rim members must be expected particularly where the bows are connected to the rim members and as a result the lenses may be forced out of the rim members. Whereas metal frames can be designed to ha~e a reasonable bending strength7 this is hardly possible with spectacle frames made of plastic material owing to the properties of` said material so that com-parable designs cannot possibly be adopted for spec-0 tacle frames mada of plastic material.
In oroer to avoid ths occurrencs of rings caused by reflection near the edges o~ th;ck lenses9 it has been proposed in British Patent Specification 739,493 to provide the bead in the rim member and to form each lens with an annular groove~ ~ut for that pur-pose the metal rim member must be split and the split frame must be closed by clasing members and a closing screw so that the design cannot be adopted for spectacle frames made of plastic material because an adequate strength cannot be obtained by means of the closing members~
It is an object of the invention to avoid these dlsadvantages and so to improve a spectacle frame of` the kind descr~bed first hereinbefore that the thick-ness of the rim member can be greatly reduced and that this can bs accomplished with simple means, which do not adversely affect the strength of the spectacle frame.
This object is accomplished in accordance with ths invention in that the bead constltutes a closed annulus extending around the rim member and has a ramP
surface on at least ons side of the rim member and that the annular groove is formsd in each lens.
Because the rim member is formed with the baad for holdin~ the lens and the bead cnnsists of a closed annulusg the thickness of the rim member can be greatly reduced but this will not involve a decrease in the cross-sectional area of the rim member at any point oF its periphery compared with a rim member having an annular grooveO Because the shape proposed by the inven-10 tion is more suitable for injection molding, the load-carrying cross-section of the rim member may be reduced to the minimum thickness required for the desired strength and this will not result in a cross-sectiona1 dimension which is too small for injection molding. For this reason the meas~re which is proposed permits the use of a rim member which is much thinner than the previously known rim members of plastic material so that the spectacle ~rame is comparable to a metal frame in appearance and evsn rimless spectacles can be simula-ted if transparent plastic material is employed,~ But the relatively high strength of such rim member would prevent ~ e insertion of a lens into the rim member in spite of the resilience of the p~stic material unless the bead has an inclined ramp sur~ace at least on one side of the beadO A lens which is forced into the rim member from that side will slide on the ramp surface and will expand the rim member until the bead snaps into the annular groove of the lens.
In a particularly desirable design, the bead has in cross-section substantially the shape of an isosceles triangle so that a symmetry is obtained9 which ensures ~24~
more favorable conditions for the manufacture of the spectacle frame and also for the insertion of the lensss~
The bead must have such a crossrsect;onal shape that it has the required strength properties and that the lenses can easily be insertedO These require-ments will be met if the vertex angle of the bead which is triangular in cross-section is 60 to 9o degrees and preFerably 75 dsgrees, With such a vertex angle there will be a ramp surface which will greatly facilitate the forcing of the lenses into the rim member and will ensure that the inserted lenses will be reliably hPld in the rim member~
If the base width of the bead exceeds the width of the groove in the inserted lens~ the ramp sur-faces of the bead will bear on the edges of the groove of a lens which has been inserted so that the lenses will be held reliably and without play as the rim mRmber surrounding the lenses bears on the latter under initial stress~
If an appropriate plastic material is se-lected~ adequake strength properties will be obtained if the thickness of the rim member~ measured in the d.i-rection of the height of the bead, is two to four times and preferably three times the height o~ the bead~ With usual proportions~ the rim member will then have a thick-ness of an order of 1 mm.
The invention is illustrated by way of ex-~mple on the drawing, which is an enlarged transverse sectional view showing a spectacle frame which embodies the invention~
~L2~51~~
The spect.acle frame comprises ~or each lens 2 a closed annular rim member 1 ~hich consists of plastic materialO That lens is held in the rim member 1 by means oF a bead 3~ which is formed on the rim member on that inside surface which faces ths lens. The bead 3 constitutes a closed annulus and has in cross-section substantially the shape of an isosceles triangle having a vertex angle of about 75 degrees. The side faces of this triangular bead 3 constitute inclined ramp sur~aces 10 4, which permit ~ e insertion of the lens 2 because the latter can slide along these ramp ~ rfaces until the bead 3 snaps into an annular groove 5 formed in the lens 2.
Because the base of the bead 3, which is triangular in cross-section, is wider than the groove 5 and the groove 5 is substantially semicircular in cross-seGtion9 the ramp sur~aces ~ of the bead 3 baar on the longitudinal edges of the annular groo~e 5 and regardless of any tolerancas which may occur the lenses 2 will be held in the rim member 1 without play becausa the rim member bears on the lens 2 under initial stressO
It is directly apparent from the drawing that the rim member which has been shown can be much thinner than a conventional spectacle rim member havinq a comparable cross-sectional area and formed with an annular groovs~ provided that a suitable plastic material is selected and the thickness of the rim member 1 mea-sured in the direction of the height of the bead is two to three times the height o~ the bead.
Spectacle frames made of plastic material comprise for each lens a closed annular rim member formed with an annular groove for recEiving a bead formed on the lsns. The resilience of the plastic material of the rim member and the possibility to change the properties of 0 its material are utili~ed to secure the lenses in the rim members. The rim members condining the lenses ensure a reliable fixation of the lenses and the lat er impart an adequate stiffness to the rim members and to the en-tire spectacle frame. ~ut the cross-se~tiona~ area and the chickness of the rim membsr made of plastic material must be above respective lower limits so that spectacle frames made of plastic material have a relatively large thickness, which is undesirable as regards appearance and weight in many cases.
To avoid the use of closed annular rim mem-bers for holding lenses of spectacles~ it is known par-ticularly in spectacles having metal frames to hold the lenses in a half frame having no lower rim portion and comprising a cord~ which replaces the lower rim portion of th0 frameO That cord is substantially ~nvisible be-cause it is insertad into a groove formed in each lensO
A disadvantage of that design resides in that it is dif-ficult to tension the cord and that the cord, which is connected to the half frame adjacent to the bridge and atthe portion to which the bows are connected~ cannot ;; i~
contribute to the torsional streng~h of the frame so that a distortion of the rim members must be expected particularly where the bows are connected to the rim members and as a result the lenses may be forced out of the rim members. Whereas metal frames can be designed to ha~e a reasonable bending strength7 this is hardly possible with spectacle frames made of plastic material owing to the properties of` said material so that com-parable designs cannot possibly be adopted for spec-0 tacle frames mada of plastic material.
In oroer to avoid ths occurrencs of rings caused by reflection near the edges o~ th;ck lenses9 it has been proposed in British Patent Specification 739,493 to provide the bead in the rim member and to form each lens with an annular groove~ ~ut for that pur-pose the metal rim member must be split and the split frame must be closed by clasing members and a closing screw so that the design cannot be adopted for spectacle frames made of plastic material because an adequate strength cannot be obtained by means of the closing members~
It is an object of the invention to avoid these dlsadvantages and so to improve a spectacle frame of` the kind descr~bed first hereinbefore that the thick-ness of the rim member can be greatly reduced and that this can bs accomplished with simple means, which do not adversely affect the strength of the spectacle frame.
This object is accomplished in accordance with ths invention in that the bead constltutes a closed annulus extending around the rim member and has a ramP
surface on at least ons side of the rim member and that the annular groove is formsd in each lens.
Because the rim member is formed with the baad for holdin~ the lens and the bead cnnsists of a closed annulusg the thickness of the rim member can be greatly reduced but this will not involve a decrease in the cross-sectional area of the rim member at any point oF its periphery compared with a rim member having an annular grooveO Because the shape proposed by the inven-10 tion is more suitable for injection molding, the load-carrying cross-section of the rim member may be reduced to the minimum thickness required for the desired strength and this will not result in a cross-sectiona1 dimension which is too small for injection molding. For this reason the meas~re which is proposed permits the use of a rim member which is much thinner than the previously known rim members of plastic material so that the spectacle ~rame is comparable to a metal frame in appearance and evsn rimless spectacles can be simula-ted if transparent plastic material is employed,~ But the relatively high strength of such rim member would prevent ~ e insertion of a lens into the rim member in spite of the resilience of the p~stic material unless the bead has an inclined ramp sur~ace at least on one side of the beadO A lens which is forced into the rim member from that side will slide on the ramp surface and will expand the rim member until the bead snaps into the annular groove of the lens.
In a particularly desirable design, the bead has in cross-section substantially the shape of an isosceles triangle so that a symmetry is obtained9 which ensures ~24~
more favorable conditions for the manufacture of the spectacle frame and also for the insertion of the lensss~
The bead must have such a crossrsect;onal shape that it has the required strength properties and that the lenses can easily be insertedO These require-ments will be met if the vertex angle of the bead which is triangular in cross-section is 60 to 9o degrees and preFerably 75 dsgrees, With such a vertex angle there will be a ramp surface which will greatly facilitate the forcing of the lenses into the rim member and will ensure that the inserted lenses will be reliably hPld in the rim member~
If the base width of the bead exceeds the width of the groove in the inserted lens~ the ramp sur-faces of the bead will bear on the edges of the groove of a lens which has been inserted so that the lenses will be held reliably and without play as the rim mRmber surrounding the lenses bears on the latter under initial stress~
If an appropriate plastic material is se-lected~ adequake strength properties will be obtained if the thickness of the rim member~ measured in the d.i-rection of the height of the bead, is two to four times and preferably three times the height o~ the bead~ With usual proportions~ the rim member will then have a thick-ness of an order of 1 mm.
The invention is illustrated by way of ex-~mple on the drawing, which is an enlarged transverse sectional view showing a spectacle frame which embodies the invention~
~L2~51~~
The spect.acle frame comprises ~or each lens 2 a closed annular rim member 1 ~hich consists of plastic materialO That lens is held in the rim member 1 by means oF a bead 3~ which is formed on the rim member on that inside surface which faces ths lens. The bead 3 constitutes a closed annulus and has in cross-section substantially the shape of an isosceles triangle having a vertex angle of about 75 degrees. The side faces of this triangular bead 3 constitute inclined ramp sur~aces 10 4, which permit ~ e insertion of the lens 2 because the latter can slide along these ramp ~ rfaces until the bead 3 snaps into an annular groove 5 formed in the lens 2.
Because the base of the bead 3, which is triangular in cross-section, is wider than the groove 5 and the groove 5 is substantially semicircular in cross-seGtion9 the ramp sur~aces ~ of the bead 3 baar on the longitudinal edges of the annular groo~e 5 and regardless of any tolerancas which may occur the lenses 2 will be held in the rim member 1 without play becausa the rim member bears on the lens 2 under initial stressO
It is directly apparent from the drawing that the rim member which has been shown can be much thinner than a conventional spectacle rim member havinq a comparable cross-sectional area and formed with an annular groovs~ provided that a suitable plastic material is selected and the thickness of the rim member 1 mea-sured in the direction of the height of the bead is two to three times the height o~ the bead.
Claims (9)
1. In a spectacle frame comprising a closed annular rim member made of plastic material and adapted to hold a lens by means of a joint comprising an annular groove and a bead fitted in said annular groove, the improvement residing in that said rim member is designed to hold a lens formed with said annular groove and said bead is formed on said rim member and constitutes a closed annulus extending around said rim member and has at least on one side of s aid rim member an inclined ramp surface.
The improvement set forth in claim 1, where-in said bead has substantially the shape of an isosceles triangle in cross-section.
3, The improvement set forth in claim 2, where-in said bead has in cross-section a vertex angle of 60 to 90 degrees.
4. The improvement set forth in claim 5, where-in said bead has in cross-section a vertex angle of 75 degrees.
5. The improvement set forth in claim 1, where-in the thickness of said rim member measured in the di-rection of the height of said bead is two to four times the height of said bead.
6. The improvement set forth in claim 5, where-in the thickness of said rim member measured in the di-rection of the height of said bead is three times the height of said bead.
7. In a spectacle frame comprising two closed annular rim members made of plastic material and adap-ted to hold respective lenses by means of respective joints comprising each an annular groove and a bead fitted in said annular groove, the improvement residing in that each of said rim members is designed to hold a lens formed with said annular groove and each of said beads is formed on one of said rim members and constitutes a closed annulus extending around said rim member and has on at least one side of said rim member an inclined ramp surface.
8. In a spectacle comprising a lens and a closed rim member made of plastic material and adapted to hold said lens by means of a joint comprising an annu-lar groove and a bead fitted in said annular groove, the improvement residing in that said lens is formed with said annular groove and said bead is formed on said rim member and constitutes a closed annulus extending around said rim member and has at least on one side of said rim member an inclined ramp surface.
9. The improvement set forth in claim 89 where-in said bead has a base width exceeding the width of said groove formed in said lens.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0007882A AT374010B (en) | 1982-01-12 | 1982-01-12 | PLASTIC EYEGLASSES |
| ATA78/82 | 1982-01-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1200996A true CA1200996A (en) | 1986-02-25 |
Family
ID=3480942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000419179A Expired CA1200996A (en) | 1982-01-12 | 1983-01-10 | Plastic spectacle frame |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0083918B1 (en) |
| JP (1) | JPS58130317A (en) |
| KR (1) | KR860001986B1 (en) |
| AT (1) | AT374010B (en) |
| AU (1) | AU547939B2 (en) |
| CA (1) | CA1200996A (en) |
| DE (1) | DE3266071D1 (en) |
| ES (1) | ES277955Y (en) |
| HK (1) | HK56686A (en) |
| SG (1) | SG9386G (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9170431B2 (en) | 2012-10-26 | 2015-10-27 | Smith Optics, Inc. | Eyewear and lenses with deflection attenuation mechanisms |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK0646824T3 (en) * | 1993-09-29 | 1997-11-03 | Huang Chien Hsing | Glasses Nursing |
| JPH09510796A (en) * | 1994-01-03 | 1997-10-28 | クレブス、マルティン | Clip-on lens mount for glasses |
| AT271U1 (en) * | 1994-04-27 | 1995-06-26 | Krebs Martin Krebs Martin | COVER FOR EYEGLASSES |
| DE19850863C2 (en) * | 1998-11-04 | 2001-09-13 | Hemaris Gmbh Chur | Process for producing a middle part of glasses |
| EP1030481B1 (en) | 1999-01-27 | 2008-02-27 | IMEC vzw | A cross-connect device and a method for switching based on space switching and grouping of channels |
| ITRN20130054A1 (en) * | 2013-12-12 | 2015-06-13 | Matia Brighi | ENGAGEMENT SYSTEM BETWEEN LENSES AND THE FRAME OF THE GLASSES |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2270382A (en) * | 1940-05-20 | 1942-01-20 | Bay State Optical Co | Eyeglass construction |
| DE842855C (en) * | 1948-11-07 | 1952-07-03 | Bruno E Schwarze | Eyeglass frame |
| GB739493A (en) * | 1953-04-23 | 1955-11-02 | Willesden Optical Works Ltd | Improvements in spectacles |
| FR1239686A (en) * | 1959-11-03 | 1960-08-26 | Capri | Flexible and adjustable ring for eyewear |
| US3904282A (en) * | 1972-10-12 | 1975-09-09 | Craig S Batista | Spectacle lenses having peaked edges |
| US4196982A (en) * | 1978-03-23 | 1980-04-08 | Parmelee Industries, Incorporated | Spectacle frame having snap-in lenses |
| JPS54146750A (en) * | 1978-05-04 | 1979-11-16 | Matsuhashi Reinetsu Kougiyou K | Paper wrapping device on culture bottle for mushroom *enokidake* |
| JPS5660919U (en) * | 1979-10-13 | 1981-05-23 |
-
1982
- 1982-01-12 AT AT0007882A patent/AT374010B/en not_active IP Right Cessation
- 1982-12-23 DE DE8282890187T patent/DE3266071D1/en not_active Expired
- 1982-12-23 EP EP82890187A patent/EP0083918B1/en not_active Expired
-
1983
- 1983-01-05 KR KR1019830000016A patent/KR860001986B1/en not_active IP Right Cessation
- 1983-01-10 CA CA000419179A patent/CA1200996A/en not_active Expired
- 1983-01-10 JP JP58001254A patent/JPS58130317A/en active Pending
- 1983-01-11 AU AU10273/83A patent/AU547939B2/en not_active Ceased
- 1983-01-12 ES ES1983277955U patent/ES277955Y/en not_active Expired
-
1986
- 1986-02-01 SG SG93/86A patent/SG9386G/en unknown
- 1986-07-31 HK HK566/86A patent/HK56686A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9170431B2 (en) | 2012-10-26 | 2015-10-27 | Smith Optics, Inc. | Eyewear and lenses with deflection attenuation mechanisms |
Also Published As
| Publication number | Publication date |
|---|---|
| HK56686A (en) | 1986-08-08 |
| SG9386G (en) | 1987-07-03 |
| ES277955U (en) | 1984-08-01 |
| AU547939B2 (en) | 1985-11-14 |
| AT374010B (en) | 1984-03-12 |
| DE3266071D1 (en) | 1985-10-10 |
| AU1027383A (en) | 1983-07-21 |
| KR860001986B1 (en) | 1986-11-07 |
| EP0083918A1 (en) | 1983-07-20 |
| KR840003363A (en) | 1984-08-20 |
| ATA7882A (en) | 1983-07-15 |
| JPS58130317A (en) | 1983-08-03 |
| EP0083918B1 (en) | 1985-09-04 |
| ES277955Y (en) | 1985-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8012386B2 (en) | Method of manufacturing a lens presenting a graded tint | |
| US5757457A (en) | Removable nosepiece for a unitary lens | |
| US5208614A (en) | Concavely indented lenses for eyeware | |
| US4537479A (en) | Progressive multifocal ophthalmic lens | |
| CA1200996A (en) | Plastic spectacle frame | |
| US7070274B2 (en) | Spectacle lens | |
| KR100601353B1 (en) | Ophthalmic lens | |
| CA2035559A1 (en) | Exchangeable lens goggle | |
| US3958867A (en) | Eyeglass structure | |
| US6241353B1 (en) | Method for making a central piece of a flexible full-rim frame for eyeglasses | |
| AU741951B2 (en) | Multifocal ophthalmic lens | |
| CN101014897A (en) | Methods for rotationally stabilizing contact lenses | |
| US5523805A (en) | System for coupling lens to an eyeglass frame | |
| US20190331934A1 (en) | Eyewear having a single release point for arm and lens interchange | |
| US5900922A (en) | Eyewear having a unitary flexible frame and an interchangeable lens | |
| RU2748585C1 (en) | Anti-glare device | |
| US2452159A (en) | Spectacles with readily removable lenses | |
| US1785929A (en) | Ophthalmic mounting | |
| US6540354B2 (en) | Multifocal ophthalmic lens | |
| KR100632193B1 (en) | Contact lens with thickness difference corrected shrinkage difference and manufacturing method thereof | |
| US4895439A (en) | Aspheric spectacle lens | |
| JP3173036U (en) | Flip-up sunglasses with inner frame | |
| US1721194A (en) | Ophthalmic lens | |
| JPS60244923A (en) | Metal frame of a pair of spectacles | |
| US20030205830A1 (en) | Method of manufacturing a lens presenting a graded tint |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |