EP0366409A2 - Sichtkorrekturlinsenmontagesystem für Atemgerät - Google Patents

Sichtkorrekturlinsenmontagesystem für Atemgerät Download PDF

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Publication number
EP0366409A2
EP0366409A2 EP89310942A EP89310942A EP0366409A2 EP 0366409 A2 EP0366409 A2 EP 0366409A2 EP 89310942 A EP89310942 A EP 89310942A EP 89310942 A EP89310942 A EP 89310942A EP 0366409 A2 EP0366409 A2 EP 0366409A2
Authority
EP
European Patent Office
Prior art keywords
eyepiece
lens
tabs
surround
attachment means
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.)
Withdrawn
Application number
EP89310942A
Other languages
English (en)
French (fr)
Other versions
EP0366409A3 (de
Inventor
Cyril Nelson Edward Angell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Avon Industrial Polymers Melksham Ltd
Avon Industrial Polymers Ltd
Original Assignee
Avon Industrial Polymers Melksham Ltd
Avon Industrial Polymers Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Avon Industrial Polymers Melksham Ltd, Avon Industrial Polymers Ltd filed Critical Avon Industrial Polymers Melksham Ltd
Publication of EP0366409A2 publication Critical patent/EP0366409A2/de
Publication of EP0366409A3 publication Critical patent/EP0366409A3/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/08—Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
    • A62B18/082—Assembling eyepieces, lenses or vision-correction means in or on gas-masks

Definitions

  • This invention relates to improvements in means for attachments of sight corrective lenses to a respirator.
  • the above attachment means are modified so that the lens mount, instead of being retained by apertured lugs, is retained by solid shoulders which project inwardly from an eyepiece surround, by virtue of there being immediately adjacent each shoulder, between it and the eyepiece surround, a blind recess into which one end of each tab of the lens mount may be inserted.
  • At least one of the tabs may have two tangentially spaced projections on its surface, the spacing of which corresponds to the tangential width of a lug projecting radially inwardly from the shoulder, so that when each tab is retained in its respective recess the pins engage with the sides of the lug, thereby substantially preventing tangential movement of the lens mount relative to the eyepiece frame.
  • the other tab is retained by the walls of the respective recessed lug, thereby substantially preventing tangential movementy of the lens mount relative to the eyepiece frame.
  • radial movement of the lens mount and tangential movement of the narrower tab may be limited by the blind recesses in the eyepiece frame into which the free ends of the respective tabs of the lens mount are inserted; tangential movement of the lens mount is also prevented in the preferred embodiment by the engagement of opposite sides of its respective lug with the two projections on that tab.
  • the resilience of the lens mount material allows the mount to be sprung into and out of its position in retentive engagement with the lugs of the eyepiece surround, but at the same time impart sufficient interference to retain the lens mount in position at all times.
  • the lens mount may be provided with seal means to engage the eyepiece of the respirator, and the attachment means be arranged to bias the seal means into contact with the eyepiece.
  • the lens may be an individual monocle, so that in a two-lens system two such lens mounts are provided for the respective eyes of the wearer.
  • the mounts may be identical (except for their handedness if provided) so that any one of a plurality of standard prescription lenses may be fitted into them exactly as if they were the standard frame of a pair of spectacles.
  • Figure 1 shows, in section, the face piece 1 of a respirator, having a circular surround 2 formed in the rubber material of the face piece into which is fitted an eyepiece 3.
  • the surround and eyepiece preferably have a configuration wherein a concave-convex portion 4, of which the radii of curvature on both sides are equal and which therefore has no optical corrective effect, is presented at an advantageous angle to the eye by the provision of an angled wall 5 linking it to a planar rim 3a of the eyepiece 3 which is held in the surround 2.
  • the surround 2 is provided with attachment means 6,7, whereby a mount 10 containing a monocular sight corrective lens 19 may be attached inside the eyepiece 3, between it and the eye of the wearer.
  • the eyepiece frame comprising the surround 2 and attachment means 6,7. It may be made of any suitable thermoplastic or thermosetting material, for example an acetal resin such as Delrin (Trade Mark).
  • the attachment means 6,7 are mounted diametrically opposite each other across the circular surround 2, but are asymmetric.
  • the surround 2 and attachment means 6,7 are preferably integrally moulded and a cross-section of the surround 2 is shown in Figure 3.
  • the dashed lines indicate the blind recesses which will be later described.
  • attachment means 6 has substantially the same cross-section as the surround 2, except that a lug 6a projects radially from a raised shoulder 6d, thereby forming a blind recess 6b between the lug and a part 6c of the surround.
  • attachment means 7 has a lug 7a projecting radially inwardly from a raised shoulder 7d, to within the inner radius of the surround 2, with a blind recess 7b between it and a part 7c of the surround.
  • the lug 7a and recess 7b of the attachment means 7 are of greater width than the lug 6a and recess 6b of the attachment means 6.
  • FIG. 5 A comparison of Figures 5 and 7 illustrates this difference; the tangential extent of the blind recesses 6b,7b and shoulders 6d,7d is shown by the dashed lines.
  • the lug 7a is narrower than the respective recess 7b, but the lug 6a is of substantially the same width as the respective recess 6b (as shown in Figure 2).
  • the lens mount 10 is a, preferably one-­piece, moulding of any suitable thermoplastic or thermosetting material, for example polycarbonate, EPDM or EPT. Polycarbonate is particularly preferred.
  • the mount 10 comprises a frame part 11, which is shown here as being circular in shape. It is to be understood, of course, that the frame part 11 may be of any other desired shape; in particular, it is desirable that it is of a standard shape for receiving a standard prescription sight corrective lens.
  • a continuous groove 12 into which may be fitted the edge of a lens 19, in a similar manner to a normal spectacle frame. A cross-section of the frame part 11 and the groove 12 are shown more clearly in Figure 11.
  • the leg 14 includes a portion 17 which is at an angle to the general plane of the frame part 11 of the mount, so as to accommodate the shape of the respirator eyepiece used, such as eyepiece 3 ( Figure 1).
  • the portion 17 fits along the angled wall part 5 of the eyepiece 3.
  • a tab end portion 18 generally coplanar with the tab 9 end portion of the leg 13.
  • the tab 18 of leg 14 is provided with two tangentially spaced pins 15, which are shown more clearly in Figure 13.
  • the pins 15 are tangentially spaced on one surface. Referring to Figure 13, the pins 15 are substantially cylindrical and are inclined at an angle to the general plane of the end portion 18 ( Figure 13(b)). The reason for this is in order to facilitate and maintain snug engagement of the pins 15 with the sides of the lug 7a of the attachment means 7.
  • tab 14 The width of tab 14 is substantially greater than that of tab 9.
  • tab 18 of the leg 14 is laterally dimensioned so that it fits snugly within the tangential extent of the recess 7b of the attachment means 7.
  • the spacing of the pins 15 of tab 18 is such as to provide snug engagement between the pins and the sides of the lug 7a of the attachment means 7.
  • the lens mount 10 can only be assembled within the eyepiece in one orientation.
  • the tab 18 is inserted under the lug 7a from a direction generally parallel to the portion 5 of the eyepiece, as seen in Figure 1.
  • the mount is then rotated so that the end of the tab 18 rides up the sloped front of the portion 7c and the tab 9 approaches the shoulder 6d.
  • the user presses it radially inwardly thereby flexing the legs 13,14 particularly in the region 17.
  • the tab 9 is then pressed towards the eyepiece 3, its tapered end assisting it in sliding past the end of the lug 6a until it snaps radially into the recess 6b, where it is held by relaxation of some of the flexion imposed on the mount to fit it.
  • the lens mount 10 which is otherwise identical to that described above, is provided with a seal ring 20 continuously around the frame part 11, on the face which will be nearer to the respirator eyepiece.
  • the seal ring 20 is of tapered section so that its extremity 21 is comparatively deformable. This extremity 21 is, in use, pressed against the inner surface of the respirator eyepiece portion 4. This pressing is due to the dimensioning of the seal ring 20 and of the attachment means 6, 7, so that when the latter are engaged there is tensioning of the tabs 13,14 to stress the seal ring and press it against the eyepiece portion 4. This prevents access of particles or moisture to the mutually adjacent faces of the lens in the mount and of the eyepiece.
  • Figure 6 shows how the lens mount may have two angled portions 17′, one on each tab, to accommodate a type of eyepiece 3′ where the concave-convex (or planar) portion 4′ is not set to one side of but intercepts the plane 22 of its rim, with angled walls 5′ on both sides of the section, the plane 23 of the tabs of the mount being, of course, parallel to plane 22. It is to be understood that the lens mounting system of the present invention may also be used in conjunction with a lens mount modified in this manner.
  • more than one blind recess may have a radially inwardly projecting lug (such as 7a) associated with it, with projections (such as 15) on the tab which is to engage with it, the spacing of the projections on different tabs being different.
  • the design of the lens mount and the lens mounting system of this invention is extremely elegant, especially in the one piece nature which can be achieved in the lens mount and the eyepiece frame.
  • no special tools or techniques are required for the assembly of the lens mount to the respirator eyepiece.
  • sight corrective lenses may be readily exchanged in a given lens mount.
  • different mounts may be supplied for a given user for use with one respirator, e.g. for different intended activities.
  • the principle enunciated for the ready attachment of sight corrective lenses inside the eyepiece of a respirator is not restricted to use with the eyepiece and surround design which has been described as preferred; the lenses may, using the present system, be equally well mounted behind purely planar eyepieces, for example.

Landscapes

  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
EP19890310942 1988-10-25 1989-10-24 Sichtkorrekturlinsenmontagesystem für Atemgerät Withdrawn EP0366409A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888824986A GB8824986D0 (en) 1988-10-25 1988-10-25 Sight corrective lens mounting system for respirators
GB8824986 1988-10-25

Publications (2)

Publication Number Publication Date
EP0366409A2 true EP0366409A2 (de) 1990-05-02
EP0366409A3 EP0366409A3 (de) 1990-11-28

Family

ID=10645768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890310942 Withdrawn EP0366409A3 (de) 1988-10-25 1989-10-24 Sichtkorrekturlinsenmontagesystem für Atemgerät

Country Status (4)

Country Link
EP (1) EP0366409A3 (de)
DK (1) DK526389A (de)
GB (1) GB8824986D0 (de)
NO (1) NO894217L (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR49815E (fr) * 1938-03-07 1939-08-08 Dispositif porte-verres médicaux pour masques à gaz
DE2646042A1 (de) * 1976-10-08 1978-04-13 Auergesellschaft Gmbh Haltevorrichtung fuer eine brille in einer atemschutzmaske
GB2200475A (en) * 1987-01-30 1988-08-03 Avon Ind Polymers Mount for an eyepiece lens

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR49815E (fr) * 1938-03-07 1939-08-08 Dispositif porte-verres médicaux pour masques à gaz
DE2646042A1 (de) * 1976-10-08 1978-04-13 Auergesellschaft Gmbh Haltevorrichtung fuer eine brille in einer atemschutzmaske
GB2200475A (en) * 1987-01-30 1988-08-03 Avon Ind Polymers Mount for an eyepiece lens

Also Published As

Publication number Publication date
GB8824986D0 (en) 1988-11-30
EP0366409A3 (de) 1990-11-28
DK526389D0 (da) 1989-10-24
DK526389A (da) 1990-04-26
NO894217L (no) 1990-04-26
NO894217D0 (no) 1989-10-24

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