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Bar Clamp with Die-Formed Notches: Hargrave, 1927
A cabinetmaker's bar clamp has a screw-adjusted jaw at one end of a bar and a sliding jaw held by a pawl in teeth along the bar. Teeth cut into the bar's edge weaken it, cannot be spaced closely, and wear until the pawl slips. John M. Hargrave of Cincinnati patented the fix in 1927, US 1,638,848: use an I-section bar and press a row of depressions into the side of its web with dies. Each depression has an abrupt, deep shoulder for the pawl and a sloping face away from it. Nothing is cut away, the corrugations stiffen the bar, the notches can be close together, and pressing them is cheaper than cutting.
Katamtaman
Workshop process
Mga Tagubilin
1
1
Form the notches
Form the notches
Press a row of spaced depressions into the web of the I-section bar with a die in a press. Each has an abrupt wall or shoulder at one end and a sloping face towards the other.
Mga materyales para sa hakbang na ito:
Baras ng clamp na may seksiyong I1 pirasoMga kailangang kasangkapan:
Pisaang pang-stamping
Die na panghubog ng uka2
2
Screw jaw
Screw jaw
Fit the clamp member with an I-shaped recess snugly over one end of the bar; its position is set by the screw.
Mga materyales para sa hakbang na ito:
Pangang inaayos ng turnilyo1 piraso3
3
Pawl slider
Pawl slider
Slide on the body with its I-shaped recess and clamp face. Pivot the pawl on a pin across the aperture in its side, with a shoulder that rocks against the front face of the aperture to take the strain off the pin. The pawl's point abuts the shoulders of the depressions and drags over the sloping faces when the slider is moved.
Mga materyales para sa hakbang na ito:
Slider na may pawl1 pirasoMga Materyales
3- Placeholder
- 1 pirasoPlaceholder
- 1 pirasoPlaceholder
Mga Kinakailangang Kasangkapan
2- Placeholder
- Placeholder
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