CA1065101A - Protective devices - Google Patents
Protective devicesInfo
- Publication number
- CA1065101A CA1065101A CA273,196A CA273196A CA1065101A CA 1065101 A CA1065101 A CA 1065101A CA 273196 A CA273196 A CA 273196A CA 1065101 A CA1065101 A CA 1065101A
- Authority
- CA
- Canada
- Prior art keywords
- visor
- aperture
- frame
- edges
- frame member
- 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
Landscapes
- Helmets And Other Head Coverings (AREA)
Abstract
Title of the Invention IMPROVEMENTS IN OR RELATING TO PROTECTIVE DEVICES
Abstract of the Disclosure A protective visor comprises an arcuately curved frame having an aperture arranged to accept an arcuately flexed rectangular sheet of resilient transparent material. The sheet is retained in the frame by lugs extending into the aperture at staggered positions on the inner and outer margins of the upper and lower frame bars and has at the sides of the aperture recesses in the frame side bars into which the lateral edges of the transparent sheet will snap. The sheet may be of transparent polycarbonate and the frame of either transparent or opaque polycarbonate. Preferably the frame has at its upper corners hinge members for attachment to a protective helmet.
Abstract of the Disclosure A protective visor comprises an arcuately curved frame having an aperture arranged to accept an arcuately flexed rectangular sheet of resilient transparent material. The sheet is retained in the frame by lugs extending into the aperture at staggered positions on the inner and outer margins of the upper and lower frame bars and has at the sides of the aperture recesses in the frame side bars into which the lateral edges of the transparent sheet will snap. The sheet may be of transparent polycarbonate and the frame of either transparent or opaque polycarbonate. Preferably the frame has at its upper corners hinge members for attachment to a protective helmet.
Description
Cross-References to Related APPlications Co-pending Canadian Application Serial ~o. 274,544 filed on March 23, 1977 by Anthony Graham Gorman and entitled 20 IMPROVED FACE SE~L FOR PROTECTIVE HELMET descr~bes an improved sealing means whereby passage of air between a visor of a protective helmet and the face of the wearer may be restricted.
~, Backqround of the Invention .~ With a number of hazardous industrial and other 1, processe~, it is necessary to protect the face and eyes of.~ 30 a worker by some protective panel in front of the face.
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, ' .' . ~ ,~ ' '. : , '` , ' ,' , ': ' , ' ' ".' ,', . : ' ' ' ', 106S~,01 Such n panel may con~ist of a trnnsparent vi~or which l)as sufficient ~trength to re~ist the impact of danger~
ou~ ~ubstances or object~ such as hot or cold ~plinter~
cf metal.
~ith the exception perhap,s of ~uitably tough-ened glas~, there i~ no kno~m and economically viable transparent material which will with~tand for very long, the impact of the substances or objects from which the wearer of a protective visor is to be protected. Thermo-plastic materials ~uch as~ say, polycarbonate in ~heet form are commonly used for transparent protective visor~
and the outer ~urface can rapidly become damaged by the ~3 impact of the afore~aid ~ub~tances or ob~ects. Addi-I tionally the ~urfac~ may become ~cratched if used in i ~ 15 generally du~ty environments, e~pecially uhere the dust is of an abrasive nature. The damage to the visor , ~.
seriou~ly reduce~ the necessary optical clarity and the visor ha~ to be replaced to avoid con~equent incon-venience and perhap~ danger to the u~er, arising from 20 the reduced vi~ibility and the visual flaring which can , ,:
occur when light impinges on scratche~ etc., on the vi~or f, ,"~
~urface. Visor replacement costs can thus be high, due -~~
to the short life of the visor material and inconvenience 1 ~ is also caused by the requirement for frequent replacement.
It is known art to reduce this visor problem , f ~ by u~ing a replaceable visor of minimum size contained in an aperture with a shield or frame of larger size.
The ~hield or frame may have a longer life expectancy than the transparent visor panel~ thus reducing replace-,~ 30 ment cost~. This application is concerned with an .~, _ 2 .~1 ~0~6510~
improved design of frame and with improved means of securing the visor panel in the frame to permit easy and quick replace-ment of the visor panel.
Existing visor frames tend to divide into two categories. One category consists of an opaque shield with a ,relatively small aperture for a visor panel. This type is commonly used for welding operations. The second category consists generally of a very narrow frame intended to hold a visor panel of large area to provide a large angle of vision.
Such narrow frames tend to be flexible and non-sturdy and prone ;~ to damage, especially when the visor panel is not in position in the frame.
Summary of the Invention It is an object of an aspect of the invention to provide a ~isor assembly yielding the largest possible viewing angle but with a frame having a long life expectancy.
It is an object of an aspect of the invention to pro-vide a visor assembly including a frame member sturdy enough to ena~le the frame to be sealed to the sides of the face of the person wearing the visor.
It is an object of an aspect of the invention to pro-vide a visor assembly comprising a replaceable visor panel of vexy simple form to minimise its replacement cost.
, In accordance with one aspect of this invention there '`'''A is provided a protective visor assembly for helmets, comprising:
' (a) a bowed frame member formed rom a synthetic plastic material, said frame member containing a generally rectangular aperture having arcuate upper and lower edgescontained in a pair of ,~ parallel spaced planes, respectively; (b) an initially planar generally rectangular visor member formed from a sheet of trans-parent resilient material; and (c) retaining means integral with ., ~L
~r~ _ 3 _ '' ~5 ~06S10~
said frame for removably mounting said visor member in a bowed condition within said aperture, said retaining means including first means adjacent the upper and lower edges of said aperture causing the corresponding upper and lower edges of said visor member to conform to the arcuate configuration of said aperture upper and lower edges, respectively, and second means adjacent the lateral sides of said aperture arranged for cooperating engagement with the corresponding side edges of said visor member.
In accordance with another aspect of this invention there is provided a protective visor assembly for helmets, comprising: (a1 a bowed frame member formed from a synthetic plastic polycarbonate material, said frame member containing ; a generally rectangular aperture having arcuate upper and ;:
lower edges contained in a pair of parallel spaced planes, respectively; (b) an initially planar generally rectangular visor member formed from a sheet of transparent resilient synthetic plastic polycarbonate material; and (c) retaining means integral with said frame for removably mounting said visor ~ 20 member in a bowed condition within said aperture, said retain-i ing means including (1) integral lug means adjacent the upper and lower edges of said aperture for maintaining the upper and lower edges of said visor member in conforming arcuate engage-ment with the arcuate upper and lower aperture edges; and (2) 1 bevel~ed groove means contained in the opposed lateral edges of said aperture for removably receiving the corresponding lateral edges of said visor member.
An embodiment of the invention comprises a frame member bounding an aperture, said aperture having similarly 3~ arcuate upper and lower edges lying in parallel horizontal planes. The upper and lower frame portions have mutually offset . - .
lugs extending into the aperture at the inner and ` - 3a -:. -I ,.
i()6510~
outer margins of the aperture and the side portions of the frame have inwardly facing grooves into which opposed edges of an initially flat sheet of transparent resilient material may be snapped when the sheet has been arcuately bent to fit within the frame aperture.
The new visor frame i8 a plastics moulding produced from any one of a number of suitable materials. Use of thi-Q
manufacturing technique enables advantageous features to be an integral part of the frame design. Once the mould tool has been produced, the individual frames can be made quite cheaply. A suitable material for the said visor frame is polycarbonate. To make the frame in the same material as is known to be suitable for visor panels confers the same protective properties on the frame as on the visor panel.
Additionally although not necessarily, the frame can be made in an opaque polycarbonate. The scratching, ~; pitting and so on which may occur on the outer surface is then unimportant and the usable life of the frame is further i extended.
The synthetic plastic moulding technique, using a j suitable synthetic plastic material, produces a frame of high rigidity and sturdiness, although the sections of the various areas of the moulded part are not particularly large. It is A also possible to include moulded-in features which accept , and effectively secure a simple design of visor panel, devoid of fixing attachments.
, .
Brief Description of the Drawinqs Additional features and advantages of the invention ."
10~5101 .: :
will become apparent from the following description of a preferred embodiment thereof, taken in conjunction with the accompanying drawings, in which:-Figure 1 shows a perspective view of the visor a~sembly;
Figure 2 shows a sectional plan view taken along line
~, Backqround of the Invention .~ With a number of hazardous industrial and other 1, processe~, it is necessary to protect the face and eyes of.~ 30 a worker by some protective panel in front of the face.
;~
:i ,~
" ,1 `~ !,,2~, ,~
, , ;.
,;~' ;
~
: :;
, , 1 ~`'.
. ~'.
:,, , , , . .: , , , : : ' ' ' . ' . ' ' ' . ' : ~, ' ' '' : ,, ~,, "
, ' .' . ~ ,~ ' '. : , '` , ' ,' , ': ' , ' ' ".' ,', . : ' ' ' ', 106S~,01 Such n panel may con~ist of a trnnsparent vi~or which l)as sufficient ~trength to re~ist the impact of danger~
ou~ ~ubstances or object~ such as hot or cold ~plinter~
cf metal.
~ith the exception perhap,s of ~uitably tough-ened glas~, there i~ no kno~m and economically viable transparent material which will with~tand for very long, the impact of the substances or objects from which the wearer of a protective visor is to be protected. Thermo-plastic materials ~uch as~ say, polycarbonate in ~heet form are commonly used for transparent protective visor~
and the outer ~urface can rapidly become damaged by the ~3 impact of the afore~aid ~ub~tances or ob~ects. Addi-I tionally the ~urfac~ may become ~cratched if used in i ~ 15 generally du~ty environments, e~pecially uhere the dust is of an abrasive nature. The damage to the visor , ~.
seriou~ly reduce~ the necessary optical clarity and the visor ha~ to be replaced to avoid con~equent incon-venience and perhap~ danger to the u~er, arising from 20 the reduced vi~ibility and the visual flaring which can , ,:
occur when light impinges on scratche~ etc., on the vi~or f, ,"~
~urface. Visor replacement costs can thus be high, due -~~
to the short life of the visor material and inconvenience 1 ~ is also caused by the requirement for frequent replacement.
It is known art to reduce this visor problem , f ~ by u~ing a replaceable visor of minimum size contained in an aperture with a shield or frame of larger size.
The ~hield or frame may have a longer life expectancy than the transparent visor panel~ thus reducing replace-,~ 30 ment cost~. This application is concerned with an .~, _ 2 .~1 ~0~6510~
improved design of frame and with improved means of securing the visor panel in the frame to permit easy and quick replace-ment of the visor panel.
Existing visor frames tend to divide into two categories. One category consists of an opaque shield with a ,relatively small aperture for a visor panel. This type is commonly used for welding operations. The second category consists generally of a very narrow frame intended to hold a visor panel of large area to provide a large angle of vision.
Such narrow frames tend to be flexible and non-sturdy and prone ;~ to damage, especially when the visor panel is not in position in the frame.
Summary of the Invention It is an object of an aspect of the invention to provide a ~isor assembly yielding the largest possible viewing angle but with a frame having a long life expectancy.
It is an object of an aspect of the invention to pro-vide a visor assembly including a frame member sturdy enough to ena~le the frame to be sealed to the sides of the face of the person wearing the visor.
It is an object of an aspect of the invention to pro-vide a visor assembly comprising a replaceable visor panel of vexy simple form to minimise its replacement cost.
, In accordance with one aspect of this invention there '`'''A is provided a protective visor assembly for helmets, comprising:
' (a) a bowed frame member formed rom a synthetic plastic material, said frame member containing a generally rectangular aperture having arcuate upper and lower edgescontained in a pair of ,~ parallel spaced planes, respectively; (b) an initially planar generally rectangular visor member formed from a sheet of trans-parent resilient material; and (c) retaining means integral with ., ~L
~r~ _ 3 _ '' ~5 ~06S10~
said frame for removably mounting said visor member in a bowed condition within said aperture, said retaining means including first means adjacent the upper and lower edges of said aperture causing the corresponding upper and lower edges of said visor member to conform to the arcuate configuration of said aperture upper and lower edges, respectively, and second means adjacent the lateral sides of said aperture arranged for cooperating engagement with the corresponding side edges of said visor member.
In accordance with another aspect of this invention there is provided a protective visor assembly for helmets, comprising: (a1 a bowed frame member formed from a synthetic plastic polycarbonate material, said frame member containing ; a generally rectangular aperture having arcuate upper and ;:
lower edges contained in a pair of parallel spaced planes, respectively; (b) an initially planar generally rectangular visor member formed from a sheet of transparent resilient synthetic plastic polycarbonate material; and (c) retaining means integral with said frame for removably mounting said visor ~ 20 member in a bowed condition within said aperture, said retain-i ing means including (1) integral lug means adjacent the upper and lower edges of said aperture for maintaining the upper and lower edges of said visor member in conforming arcuate engage-ment with the arcuate upper and lower aperture edges; and (2) 1 bevel~ed groove means contained in the opposed lateral edges of said aperture for removably receiving the corresponding lateral edges of said visor member.
An embodiment of the invention comprises a frame member bounding an aperture, said aperture having similarly 3~ arcuate upper and lower edges lying in parallel horizontal planes. The upper and lower frame portions have mutually offset . - .
lugs extending into the aperture at the inner and ` - 3a -:. -I ,.
i()6510~
outer margins of the aperture and the side portions of the frame have inwardly facing grooves into which opposed edges of an initially flat sheet of transparent resilient material may be snapped when the sheet has been arcuately bent to fit within the frame aperture.
The new visor frame i8 a plastics moulding produced from any one of a number of suitable materials. Use of thi-Q
manufacturing technique enables advantageous features to be an integral part of the frame design. Once the mould tool has been produced, the individual frames can be made quite cheaply. A suitable material for the said visor frame is polycarbonate. To make the frame in the same material as is known to be suitable for visor panels confers the same protective properties on the frame as on the visor panel.
Additionally although not necessarily, the frame can be made in an opaque polycarbonate. The scratching, ~; pitting and so on which may occur on the outer surface is then unimportant and the usable life of the frame is further i extended.
The synthetic plastic moulding technique, using a j suitable synthetic plastic material, produces a frame of high rigidity and sturdiness, although the sections of the various areas of the moulded part are not particularly large. It is A also possible to include moulded-in features which accept , and effectively secure a simple design of visor panel, devoid of fixing attachments.
, .
Brief Description of the Drawinqs Additional features and advantages of the invention ."
10~5101 .: :
will become apparent from the following description of a preferred embodiment thereof, taken in conjunction with the accompanying drawings, in which:-Figure 1 shows a perspective view of the visor a~sembly;
Figure 2 shows a sectional plan view taken along line
2-2 of Figure 3 and showing the visor panel retaining means at the lower edge of the visor panel aperture: and Figure 3 shows a central vertical section through .
the vi~or assembly, t ken along line 3-3 of Figure 2.
Description of the Preferred Embodiment Figure 1 shows a per~pective view of a du~t helmet ~ ;
10 ~ncludlng a visor assembly 11 in accordance with the inven-;j tion. The visor assembly includes a frame member 12, .~ , advantageously itself transparent, which is attached by way of pivot lugs 13 to a helmet shell 20. The assembly ll further includes a transparent viewing panel 15 snap-fitted in an aperture 14 bounded by frame member 12. The viewing panel 15 is retained in aperture 14 by staggered lugs 16 ~ .
17_-c provided respectively on the inner and outer edg~s of aperture 14 and extending into the aperture. Advantageously ~ the inner lugs 16 are flush with the inner surface of frame ., .
~ member 12 while the outer lugs 17 project from the general .~ outer surface of the frame member. It i5 advantageous to provide at the rear edges 18 of frame member 12 a face sealing means arranged to restrict air flow between the sides of the visor assembly 11 and the face of a person wearing the helmet 20~ These face seals are advantageously as described in .... ' copending Canadian application Serial Number 273,197, filed lOGS101 March 4, 1977, srian A. Lowe et al.
Figure 2 shows a i~ectional plan view of the visor, taken along the line 2 - 2 of Figure 3. It will be seen that inner lugs 16 are disposed alternately with outer lugs 17 ~o that the inner and outer lugs are mutually offset to retain viewing panel 15 in its required curved form. The ends of panel 15 are retained in bevelled grooves 12a formed in the -, side portions 12b of frame member 12. The manner in which these panel-retaining elements operate is now described.
A visor panel 15, preferably but not necessarily of polycarbonate sheet, of a suitable thickness can be inserted into the visor frame by sliding the sheet with a horizontal motion behind the cen~ral and outer lugs 17~ 17b~ 17c,.
By pressing gently on the rear sur~ace of the visor panel in the region of one of the outer lugs 17~ 17c and by s~multan- '' eously pressing from the front at the vertical edge of the , ,, visor panel this edge can be snapped into position in the . ; .
~ aforesaid groove,l2_. Repeating,this process secures the '' remaining vertical edge of the visor panel 15. Once the '~ 20 visor panel is in position in the aperture of the visor ~ frame it can onLy be dislodged when intentionally required ,1 and is otherwise firmly retained in position.
Prefe ~'ly, though not necessarily, the visor assembly includes face sealing members 19 attached to the .. ,1~ , , ~ side members 12b of the visor frame 12 at their rear edges "~ .
'~ 1 so as to restrict the passage of air between the visor and "~ the wearer's face at the sides of the visor frame. These seals may advantageously be of the kind described in above-~`' referenced co-pending Patent application Serial Number 273,197,.
10~5101 An advantage of the visor assembly described is that all of the moulded visor panel retaining features of the visor frame can be produced without separate movable portions of the moulding tool and therefore manufacturing cost is reduced and moulding tool reliability is improved.
Impact and ballistic te~ting has shown that a visor panel of semi-flex~ble synthetic plastic sheet is adequately retained so as to withstand the nece~sary impacts and to provide the required face and eye protection without the visor panel being dislodged. ;
The arrangement described provides a large viewing angle through the visor a~embly but without requiring a larger and more c09tly vi~or panel which would otherwise ~ be re~uired if any known existing type of vi~or frame wa~
r~ , used. The invention i~ aimed at reducing costs of replacement o,f various visor component parts and thi~ a~m is also achieved by the low cost obtained by the u~e of the moulded-in visor ;~ .
;j panel retaining features.
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.: .
,, , ., .
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., .
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the vi~or assembly, t ken along line 3-3 of Figure 2.
Description of the Preferred Embodiment Figure 1 shows a per~pective view of a du~t helmet ~ ;
10 ~ncludlng a visor assembly 11 in accordance with the inven-;j tion. The visor assembly includes a frame member 12, .~ , advantageously itself transparent, which is attached by way of pivot lugs 13 to a helmet shell 20. The assembly ll further includes a transparent viewing panel 15 snap-fitted in an aperture 14 bounded by frame member 12. The viewing panel 15 is retained in aperture 14 by staggered lugs 16 ~ .
17_-c provided respectively on the inner and outer edg~s of aperture 14 and extending into the aperture. Advantageously ~ the inner lugs 16 are flush with the inner surface of frame ., .
~ member 12 while the outer lugs 17 project from the general .~ outer surface of the frame member. It i5 advantageous to provide at the rear edges 18 of frame member 12 a face sealing means arranged to restrict air flow between the sides of the visor assembly 11 and the face of a person wearing the helmet 20~ These face seals are advantageously as described in .... ' copending Canadian application Serial Number 273,197, filed lOGS101 March 4, 1977, srian A. Lowe et al.
Figure 2 shows a i~ectional plan view of the visor, taken along the line 2 - 2 of Figure 3. It will be seen that inner lugs 16 are disposed alternately with outer lugs 17 ~o that the inner and outer lugs are mutually offset to retain viewing panel 15 in its required curved form. The ends of panel 15 are retained in bevelled grooves 12a formed in the -, side portions 12b of frame member 12. The manner in which these panel-retaining elements operate is now described.
A visor panel 15, preferably but not necessarily of polycarbonate sheet, of a suitable thickness can be inserted into the visor frame by sliding the sheet with a horizontal motion behind the cen~ral and outer lugs 17~ 17b~ 17c,.
By pressing gently on the rear sur~ace of the visor panel in the region of one of the outer lugs 17~ 17c and by s~multan- '' eously pressing from the front at the vertical edge of the , ,, visor panel this edge can be snapped into position in the . ; .
~ aforesaid groove,l2_. Repeating,this process secures the '' remaining vertical edge of the visor panel 15. Once the '~ 20 visor panel is in position in the aperture of the visor ~ frame it can onLy be dislodged when intentionally required ,1 and is otherwise firmly retained in position.
Prefe ~'ly, though not necessarily, the visor assembly includes face sealing members 19 attached to the .. ,1~ , , ~ side members 12b of the visor frame 12 at their rear edges "~ .
'~ 1 so as to restrict the passage of air between the visor and "~ the wearer's face at the sides of the visor frame. These seals may advantageously be of the kind described in above-~`' referenced co-pending Patent application Serial Number 273,197,.
10~5101 An advantage of the visor assembly described is that all of the moulded visor panel retaining features of the visor frame can be produced without separate movable portions of the moulding tool and therefore manufacturing cost is reduced and moulding tool reliability is improved.
Impact and ballistic te~ting has shown that a visor panel of semi-flex~ble synthetic plastic sheet is adequately retained so as to withstand the nece~sary impacts and to provide the required face and eye protection without the visor panel being dislodged. ;
The arrangement described provides a large viewing angle through the visor a~embly but without requiring a larger and more c09tly vi~or panel which would otherwise ~ be re~uired if any known existing type of vi~or frame wa~
r~ , used. The invention i~ aimed at reducing costs of replacement o,f various visor component parts and thi~ a~m is also achieved by the low cost obtained by the u~e of the moulded-in visor ;~ .
;j panel retaining features.
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Claims (8)
1. A protective visor assembly for helmets, comprising:
(a) a bowed frame member formed from a synthetic plastic material, said frame member containing a generally rectangular aperture having arcuate upper and lower edges con-tained in a pair of parallel spaced planes, respectively;
(b) an initially planar generally rectangular visor member formed from a sheet of transparent resilient material;
and (c) retaining means integral with said frame for removably mounting said visor member in a bowed condition within said aperture, said retaining means including first means adjacent the upper and lower edges of said aperture caus-ing the corresponding upper and lower edges of said visor member to conform to the arcuate configuration of said aperture upper and lower edges, respectively, and second means adjacent the lateral sides of said aperture arranged for cooperating engage-ment with the corresponding side edges of said visor member.
(a) a bowed frame member formed from a synthetic plastic material, said frame member containing a generally rectangular aperture having arcuate upper and lower edges con-tained in a pair of parallel spaced planes, respectively;
(b) an initially planar generally rectangular visor member formed from a sheet of transparent resilient material;
and (c) retaining means integral with said frame for removably mounting said visor member in a bowed condition within said aperture, said retaining means including first means adjacent the upper and lower edges of said aperture caus-ing the corresponding upper and lower edges of said visor member to conform to the arcuate configuration of said aperture upper and lower edges, respectively, and second means adjacent the lateral sides of said aperture arranged for cooperating engage-ment with the corresponding side edges of said visor member.
2. A visor assembly as claimed in claim 1, wherein said second retaining means comprises bevelled grooves formed in the frame portions bounding the lateral edges of said aperture, and further wherein said first retaining means comprises lug means extending into said aperture from the inner and outer surfaces of the frame portions bounding the top and bottom edges thereof.
3. A visor assembly as claimed in claim 2, wherein said lug means extending from said inner edge surface and said lug means extending from said outer edge surface of said frame portions are mutually offset.
4. A visor assembly as claimed in claim 3, wherein said inner lug means are flush with the inner surface of said frame member, and further wherein said outer lug means protrude from the outer surface of said frame member.
5. A visor assembly as claimed in claim 1, wherein said frame member and said visor member are each formed of poly-carbonate.
6. A visor assembly as claimed in claim 3, wherein said frame member is formed of opaque polycarbonate.
7. A visor assembly as claimed in claim 1, wherein said frame member includes pivot lugs formed at the opposed upper corners thereof, whereby to mount said assembly pivotally on a protective helmet.
8. A protective visor assembly for helmets, comprising:
(a) a bowed frame member formed from a synthetic plastic polycarbonate material, said frame member containing a generally rectangular aperture having arcuate upper and lower edges contained in a pair of parallel spaced planes, respectively;
(b) an initially planar generally rectangular visor member formed from a sheet of transparent resilient synthetic plastic polycarbonate material; and (c) retaining means integral with said frame for removably mounting said visor member in a bowed condition within said aperture, said retaining means including (1) integral lug means adjacent the upper and lower edges of said aperture for maintaining the upper and lower edges of said visor member in conforming arcuate engage-ment with the arcuate upper and lower aperture edges; and (2) bevelled groove means contained in the opposed lateral edges of said aperture for removably receiving the corresponding lateral edges of said visor member.
(a) a bowed frame member formed from a synthetic plastic polycarbonate material, said frame member containing a generally rectangular aperture having arcuate upper and lower edges contained in a pair of parallel spaced planes, respectively;
(b) an initially planar generally rectangular visor member formed from a sheet of transparent resilient synthetic plastic polycarbonate material; and (c) retaining means integral with said frame for removably mounting said visor member in a bowed condition within said aperture, said retaining means including (1) integral lug means adjacent the upper and lower edges of said aperture for maintaining the upper and lower edges of said visor member in conforming arcuate engage-ment with the arcuate upper and lower aperture edges; and (2) bevelled groove means contained in the opposed lateral edges of said aperture for removably receiving the corresponding lateral edges of said visor member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA273,196A CA1065101A (en) | 1977-03-04 | 1977-03-04 | Protective devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA273,196A CA1065101A (en) | 1977-03-04 | 1977-03-04 | Protective devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1065101A true CA1065101A (en) | 1979-10-30 |
Family
ID=4108078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA273,196A Expired CA1065101A (en) | 1977-03-04 | 1977-03-04 | Protective devices |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1065101A (en) |
-
1977
- 1977-03-04 CA CA273,196A patent/CA1065101A/en not_active Expired
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