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Safety Goggles: Soft Plastic Frame with Turnable Splash-Proof Vent Caps (Hirschmann, US 3,141,172, 1964)
Goggles that let air in but keep splashes out. A soft polyethylene frame seals on the face and holds one clear lens for both eyes. Four vents sit in the frame, each a short tube under a cup-shaped cap with holes on one side only. You turn each cap so its solid side faces the splash; air takes a winding path in, and any liquid that gets into a cap drains out of a hole at the bottom.
Result: ventilated safety goggles against liquids, chips and particles, with a lens you can replace.
Source: J. B. Hirschmann, US 3,141,172 (1964), with the frame and lens of his US 2,773,260 (1956). Unknown: sizes, the moulding, the strap. Picture: the patent drawing.
Kati
Unknown
Maagizo
1
1
Mould the frame
Mould the frame
Mould a one-piece goggle frame of a soft, light-transmitting plastic such as polyethylene. Give it a front rim with one opening for both eyes, narrower above the nose, and a nose pad moulded with the rim. Behind the rim, a wall runs back and ends in a flange that fits the face. Form a flange on the front of the rim to seat the lens, and short shoulders with sloping backs round the inside of the rim. Put a strap loop near the back edge on each side: a soft frame strapped at the front would be squeezed out of shape. Ours: LDPE. Not given: sizes, how it is moulded.
Vifaa kwa hatua hii:
Chembechembe za LDPE1 frameZana zinazohitajika:
Vipimo visivyojulikana2
2
Make the lens
Make the lens
Cut one lens from clear, flexible plastic such as cellulose acetate, shaped to match the rim, and pre-curve it to the shape it takes in the frame. Fit male snap fasteners (the 'Dot' type) to its edge strip above and below the nose part, and matching female ones in the rim flange. Not given: the thickness.
Vifaa kwa hatua hii:
Bamba la plastiki la uwazi1 lens
Kifaa cha Vifungo vya Kubonyeza (Kazi Nzito)1 2 pairsZana zinazohitajika:
MkasiVipimo visivyojulikana3
3
Make the four vents
Make the four vents
Mould each vent in two parts, of plastic or metal. The base is a short tube with a flange round its inner end; the cap is a cup that screws onto the tube (a press fit or solvent seal also serves), with a closed end and an outer flange. Through the cap's side, between the tube's end and the frame, make about three holes covering half the way round, and leave the other half solid. Not given: sizes.
Vifaa kwa hatua hii:
Nyenzo isiyojulikana4 vent bases and capsZana zinazohitajika:
Vipimo visivyojulikana4
4
Assemble and set the caps
Assemble and set the caps
Make four holes in the frame wall: two at the top, two at the sides. Push each vent tube through from inside so its flange seals on the inside of the wall, and screw the cap on so its flange seals on the outside. Seat the lens against the rim flange, guided by the shoulders, and press the snaps home. Thread a head strap through the two loops. Before work, turn each cap so its solid side faces the expected splash, with one hole pointing down. Air then winds in under the cap and back down the tube; particles strike the walls and drop, and any liquid drains out of the lower hole. Not given: the strap material.
Vifaa kwa hatua hii:
Nyenzo isiyojulikana1 head strapZana zinazohitajika:
Kitoboa karatasiVifaa
4- 1 frameKishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- 1 head strapKishikilia Nafasi
Vifaa vya Michoro Iliyounganishwa
Usambazaji 10%
Chemical Splash Goggles: One Sealed Lens in a Moulded Rubber Frame (Hirschmann, 1954)
na Emma
Mitambo
10
0
0
0
1
0
Hatari
Usambazaji 10%
LDPE Pellets: Ethylene Polymerised at 1500 Atmospheres with a Trace of Oxygen
na Charlie
Viwandani
13
0
0
0
2
0
Usambazaji 10%
Plastic Sheet and Blown Film Extrusion
na Emma
Ukingo wa Extrusion
43
0
0
0
2
0
Usambazaji 10%
The Snap Fastener: A Spring That Pinches the Same Every Way
na Tex
Nguo na Ngozi
42
0
0
0
1
0
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