Oblique-Rack Egg Beater: One Rack Turns Two Beaters Opposite Ways

"It is not contended that the use of two pear shaped egg beaters one within the other is a patentable novelty, nor the vibrating of egg beaters by means of a rack and pinions as these devices have been already used; but the arranging of the two sides of the rack piece at different elevations, one of which corresponds to the height of the upper pinion (e'), and the other to that of the lower pinion (d'), presents a feature not hitherto found in any such apparatus."

Print the rack frame (/uploads/blueprints/oblique-rack-egg-beater-rack.stl) and two 10-tooth pinions (/uploads/blueprints/oblique-rack-egg-beater-pinion.stl). Print in PETG at 0.2 mm layers, 30 % infill, 4 walls.

Epoxy the lower pinion to a 5 mm rod. Epoxy the upper pinion to a length of silicone tube sleeved over the rod above it, so each turns on its own.

Bend two pear-shaped loops of stainless wire 24 mm across onto the rod's foot (inner) and two 44 mm across onto the sleeve's foot (outer).

Fix a hardwood handle above the pinions on a fork that holds the arbor, and another on the end of the rack frame. Slide the frame on so each side meshes its pinion.

US 26,958 drawing sheet, public domain (expired patent).

Hold the upper handle in one hand and vibrate the rack handle with the other in a bowl of two egg whites; time to stiff peaks.

**Sylvenus Walker** of Boston, assignor to William P. Spence, received US 26,958, dated 24 January 1860. With the beaters vertical, one side of the rack is higher than the other by the pinion's thickness, so the frame stands oblique to the horizon; he called that an important feature. He claimed the oblique rack and pinions in combination. **Honest limits.** FDM prints hold food in their layer lines, so wash well and replace when worn. A level frame with one side raised stands in for his oblique one, and a silicone sleeve for his hollow shaft. Your times are the result.