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Hose-Clamp Saddle, Screw Housing and Worm Screw (North & Burke, 1945)
North and Burke's worm-drive hose clamp of 1945 has three small parts on the band: a U-shaped saddle welded to it, a housing that fits over the saddle as the screw's casing, held by prongs riveted through its flanges, and a screw with one continuous thread whose reduced ends sit in slots in the housing's end walls. Here they are made by hand from mild steel sheet and bar instead of being stamped; method and sizes are ours.
The picture: North and Burke's patent drawing, US 2,386,629.
Advanced
1 day
Instructions
1
1
Saddle
Saddle
From 0.8 mm mild steel sheet cut a strip as wide as the band, with two narrow tabs on each long edge for the prongs. Bend the long edges up into a U and curve the base slightly along its length to match the band.
Materials for this step:
Mild Steel Sheet1 pieceTools needed:
Scriber
Ruler
Tin Snips
File Set
Bench Vise
Cross Peen Hammer
Leather Work Gloves2
2
Screw housing
Screw housing
Cut a blank for the casing that fits over the saddle, with a flange along each side and an end wall at each end. Drill a hole in each flange where a prong will pass, and cut a slot down into each end wall for the screw's reduced ends. Bend it to shape.
Tools needed:
ScriberTin Snips
Hand DrillFile SetBench ViseCross Peen HammerLeather Work Gloves3
3
Turn the worm screw
Turn the worm screw
Chuck mild steel bar and turn the screw: a head with a screwdriver slot, a shoulder, the threaded body, and a reduced end at each end that drops into the housing's slots, with shoulders that bear on the end walls.
Materials for this step:
Mild Steel Bar1 pieceTools needed:
Metal Lathe
Lathe Chuck 3-Jaw
Lathe Cutting Tool
Parting Tool
Hacksaw
Digital Caliper 6-Inch
Cutting Oil
Safety Glasses4
4
Cut the thread
Cut the thread
Single-point cut one continuous thread along the body, its pitch matching the spacing of the band's slots, with a flat working face and a rounded back so it fills the slots.
Tools needed:
Metal LatheLathe Cutting Tool
Thread Pitch GaugeCutting Oil5
5
Trial fit
Trial fit
Lay the screw in the saddle with its ends in the housing's slots, fit the housing over it and check the prongs pass through the flange holes and the screw turns freely without end play. The clamp blueprint then welds, rivets and assembles them.
Tools needed:
Digital Caliper 6-InchFile SetMaterials
2- 1 piecePlaceholder
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Tools Required
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