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Worm-Drive Hose Clamp: North & Burke, 1945
Edwin W. North and William O. Burke of the National Lock Company, Rockford, Illinois, patented this hose clamp in 1945, US 2,386,629, for hoses carrying compressed air, gasoline and other fluids in aircraft. A band of resilient spring steel is pierced with a row of slanted slots, which a stamping operation can make, set at the angle of the screw thread. A U-shaped saddle is spot welded near one end of the band, and a housing riveted to it holds a screw whose thread runs through the slots. Turning the screw draws the band tight. One clamp fits a wide range of hose sizes.
Intermediate
Factory process
Instructions
1
1
Slot the band
Slot the band
Stamp a row of transverse slots along the spring steel band, inclined to match the spiral thread of the screw.
Materials for this step:
Spring Steel Strip1 as requiredTools needed:
Stamping Press2
2
Saddle
Saddle
Spot weld the U-shaped saddle, its base curved along the band, near the band's inner end. The band is set up by the base's thickness so the base's curved inner surface continues the band's.
Materials for this step:
Hose Clamp Saddle1 pieceTools needed:
Spot Welder3
3
Screw and housing
Screw and housing
Lay the screw, with its continuous spiral thread, in the saddle with its reduced ends in the slots of the housing's end walls. Fit the housing over it: the prongs on the saddle's side walls pass through openings in the housing's flanges and are riveted over to fix them together.
Materials for this step:
Hose Clamp Worm Screw1 piece
Hose Clamp Screw Housing1 piece4
4
Fit
Fit
Pass the band's free end round the hose and under the screw: the thread engages the slots, and turning the screw draws the band tight.
Materials
4- 1 as requiredPlaceholder
- 1 piecePlaceholder
- 1 piecePlaceholder
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Tools Required
2- Placeholder
- Spot Welder10% commissionPlaceholder
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