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Jigsaw: Motor-Rocked C-Frame on a Leaf Spring (Heese, US 2,692,622, 1954)

George O. Heese · Public domain (US patent drawing)

أنشأه

Woody

3. نوفمبر 2026

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.

متوسط

Unknown

التعليمات

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.

المواد لهذه الخطوة:

مادة غير معروفة1 base, support, walls, table, box

تشكيلة براغي سداسية1 fasteners

الأدوات المطلوبة:

منشار حديد

مثقب يدوي

أبعاد غير معروفة

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.

المواد لهذه الخطوة:

معدن غير معروف1 frame arms and back

نابض صفائحي1 قطعة

تشكيلة براغي سداسية1 قطعة

صامولة سداسية1 قطعة

الأدوات المطلوبة:

مفتاح ربط قابل للضبط

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.

المواد لهذه الخطوة:

محرك كهربائي1 قطعة

جلبة لامركزية1 eccentric

معدن غير معروف1 two strips

تشكيلة براغي سداسية1 two bolts

صامولة سداسية2 قطع

طقم نوابض ضغط1 two coil springs

الأدوات المطلوبة:

مفتاح ربط قابل للضبط

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.

المواد لهذه الخطوة:

معدن غير معروف1 clamp strips, bracket, arm, guides