Samvinna
LIST
FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
Chemical Splash Goggles: One Sealed Lens in a Moulded Rubber Frame (Hirschmann, 1954)
Goggles for work with corrosive liquids. One clear plastic lens covers both eyes and sits sealed all round in a soft moulded rubber frame that seals against the face. The version for gas and corrosive liquids has no vent holes at all, and the strap passes through tabs outside the lens, so nothing can leak through or around the part you look through.
Result: chemical splash goggles with a lens you can pull out and replace, and a strap pull shared evenly between lens and frame, so neither warps.
Source: J. B. Hirschmann, US Patent 2,680,846 (1954), Fig. 4 version. Unknown: sizes, the rubber compound, the strap material and how the frame is moulded. Ours: the mould; the patent tested a cellulose acetate lens. Picture: patent drawing.
Miðlungs
2 days
Leiðbeiningar
1
1
Mould the rubber frame
Mould the rubber frame
Mould the frame in one piece from rubber. The front rim has one opening shaped for both eyes, narrower above the nose. Behind it, a wall forms the eye chamber and ends in a double flange that seals against the face. Inside the rim, form a channel between an outer and an inner flange to hold the lens edge. At each end, mould a lug with a strap slot and a slit through the channel for the lens tab. For corrosive liquids, leave out all vent holes. Ours: a compression mould.
Efni fyrir þetta skref:
Gúmmíblanda1 frameNauðsynleg verkfæri:
Pressumót
Óþekkt mál2
2
Cut the lens
Cut the lens
Cut one lens from flexible clear plastic, shaped to match the rim. The patent tested cellulose acetate. Leave a tab at each end, outside the area you look through. Cut a closed slot in each tab and line it with a grommet. Make two holes at the centre for the bolts. Leave no other holes in the viewing area.
Efni fyrir þetta skref:
Glær plastplata1 lens
Hólknagli2 tab grommetsNauðsynleg verkfæri:
Plötuklippur
Körnunardorg3
3
Seal the lens in the frame
Seal the lens in the frame
Spring the lens edge into the channel all the way round, pushing each tab out through its slit so it lies under the lug, slot over slot. Fasten the centre with two stainless-steel bolts and nuts. (The vented version uses snap fasteners here.)
Efni fyrir þetta skref:
Vélskrúfur2 stainless steel
Sexkantró2 stainless steelNauðsynleg verkfæri:
Skrúfjárnasett4
4
Fit the head strap
Fit the head strap
Use a strap in two halves, joined at the back by a buckle, each half with a thickened end. Slide a slotted plate of metal or plastic onto each half, then thread it from the front through the lug slot and the lens-tab slot. The thick end stops against the plate and lug. The pull of the strap now goes into both lens and frame, holds the lens in, and stays outside the field of view.
Efni fyrir þetta skref:
Höfuðband hlífðargleraugna1 two halves
Koparsylgja með tungu1 stykki
Óþekktur efniviður1 two slotted platesNauðsynleg verkfæri:
Óþekkt málEfni
8- 1 frameStaðgengill
- 1 lensStaðgengill
- 2 tab grommetsStaðgengill
- 2 stainless steelStaðgengill
- 2 stainless steelStaðgengill
- 1 two halvesStaðgengill
- 1 stykkiStaðgengill
- 1 two slotted platesStaðgengill
Nauðsynleg verkfæri
5- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
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