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Jigsaw: Motor-Rocked C-Frame on a Leaf Spring (Heese, US 2,692,622, 1954)
A small electric jig saw for curved cuts. A long U-shaped frame holds a fine blade stretched between its two arms. The frame's back end hangs on an L-shaped leaf spring, and an eccentric on a motor shaft rocks its lower arm up and down, so the blade saws through a slot in the table while the spring flexes. A wing nut tensions the blade; sawdust falls into a box below.
Result: a compact motor-driven jig (scroll) saw.
Source: G. O. Heese, US 2,692,622 (1954). Unknown: materials, sizes, the motor and the stroke. Picture: the patent drawing.
中级
Unknown
说明
1
1
Build the base and table
Build the base and table
Make a long flat base, wider at the front. Fasten a long upright support along it, its back end a separate upright strip. Across the wide front stand two walls with matching upright guide slots, carrying a level table that overhangs to the front with a slot for the blade. Under the overhang set a removable open box for sawdust. Not given: materials, sizes.
此步骤所需材料：
未知材料1 base, support, walls, table, box
六角螺栓组合1 fasteners所需工具：
钢锯
手摇钻
未知尺寸2
2
Make the C-frame and spring hinge
Make the C-frame and spring hinge
Make a U-shaped blade frame: an upper arm, a lower arm, and a back piece made in one with the lower arm and bolted to the upper. Fix the upright part of an L-shaped leaf spring to the support's back strip; its flat part goes into a slot in the frame's back piece and is held by the same bolt. The frame can now swing up and down on the spring, its lower arm running in the walls' guide slots under the table.
此步骤所需材料：
未知金属1 frame arms and back
钢板弹簧1 个六角螺栓组合1 个
六角螺母1 个所需工具：
活动扳手3
3
Fit the motor and eccentric
Fit the motor and eccentric
Fix an electric motor on the wide front of the base with its shaft running across under the frame's lower arm. Put two bolts down through the lower arm, one each side of the shaft; on them hang a lower strip resting on nuts and an upper strip under the arm, with a coil spring on each bolt pushing the strips apart. Fix an eccentric on the motor shaft between the two strips: as it turns it rocks the frame. Not given: the motor, the throw.
此步骤所需材料：
电动机1 个
偏心衬套1 eccentric未知金属1 two strips六角螺栓组合1 two bolts六角螺母2 个
压缩弹簧套装1 two coil springs所需工具：
活动扳手4
4
Fit the blade clamps and use it
Fit the blade clamps and use it
On the lower arm fix a strip with a forked end that hooks under the blade's lower pin. On the upper arm fit a bracket with a cross pin; an arm rocks on it, its forked front end over the blade's upper pin, its back end pulled down by a bolt with a wing nut. Add forked guide strips above and below the table. To fit a blade, loosen the wing nut, hook both pins and tighten the nut to stretch the blade straight. Switch on and feed the work across the table. Ours: a pinned coping-saw blade.
此步骤所需材料：
未知金属1 clamp strips, bracket, arm, guides
翼形螺母1 个六角螺栓组合1 个
钢丝锯锯条1 pinned blade所需工具：
活动扳手材料
10- 1 base, support, walls, table, box占位符
- 1 two bolts占位符
- 1 clamp strips, bracket, arm, guides占位符
- 1 个占位符
- 3 个占位符
- 1 个占位符
- 1 eccentric占位符
- 1 two coil springs占位符
- 1 个占位符
- 1 pinned blade占位符
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