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Masher, Pounder and Mincer: Three Kitchen Tools on One Handle
Jacob J. Diehl, York, Pennsylvania · Public domain (expired patent)
TheChef

Created by

TheChef

6. October 2026DK
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Masher, Pounder and Mincer: Three Kitchen Tools on One Handle

A masher, a steak pounder and a mincing knife are three tools to buy and store. Jacob J. Diehl of York, Pennsylvania, received US 93,862, dated 17 August 1869, for a kitchen utensil combining "a vegetable-masher, steak-pounder, and mincing-knife": an ordinary masher with a plate of pyramidal teeth fixed to its foot, and a mincing knife whose shank passes through the handle and is fastened by a nut, its back resting in a groove between two rows of teeth. This rung compares head weights, then prints the toothed head, fits a knife from spring steel, and uses the tool three ways.
Intermediate
About 2 hours, plus printing

Instructions

1

Head weight and blow

Loading Jupyter Notebook...
2

A masher before it

The embedded blueprint mashes with a wire coil. Diehl's masher is solid, with teeth to pound and a knife to mince.
3

Read US 93,862

"D is the mincing-knife, provided with a shank, a, which passes through the handle A. The back of the knife rests in a groove in the plate C, between two rows of the teeth, and is secured by a nut, b, screwed on to the shank a, or by equivalent means. This knife is preferably detached, when the implement is in use as a masher or pounder."
4

Print the head

Print the head with its toothed face, groove and socket (/uploads/blueprints/masher-pounder-mincer-head.stl) at 100 % infill for weight. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Materials for this step:

PETG FilamentPETG Filament1 piece

Tools needed:

FDM 3D PrinterFDM 3D Printer
5

Make the knife

Cut a crescent 56 mm across from spring steel strip and file its curved edge sharp. Epoxy a 5 mm steel rod, threaded at its end with the die, to the middle of its back as the shank, 230 mm long.

Materials for this step:

Spring Steel StripSpring Steel Strip1 piece
Mild Steel RodMild Steel Rod1 piece
Two-Part EpoxyTwo-Part Epoxy1 piece

Tools needed:

Tin SnipsTin Snips
Files (Hand File)Files (Hand File)
WhetstoneWhetstone
Bench ViseBench Vise
Tap and Die SetTap and Die Set
Leather Work GlovesLeather Work Gloves
Clear Safety GlassesClear Safety Glasses
6

Handle and nut

Drill a hardwood dowel through its length for the 5 mm shank, epoxy it into the head's socket, pass the shank up through, and hold it with a nut at the top.

Materials for this step:

Hardwood DowelsHardwood Dowels1 piece
Two-Part EpoxyTwo-Part Epoxy1 piece
Hex NutHex Nut1 piece

Tools needed:

Cordless DrillCordless Drill
Drill Bit SetDrill Bit Set
Adjustable SpannerAdjustable Spanner
7

The build in 3D

FreeCAD model of this build, not of the patent: the head with its pyramidal teeth and knife groove, the crescent knife with its back in the groove, the shank through the handle, and the handle.
Design FileBLENDCC0 - Free
Download Model
8

Use it three ways

With the knife off, mash boiled potatoes, then pound a cabbage leaf flat on the board with the teeth. Refit the knife and mince an onion. Time each.
Step 8 - Image 1

Materials for this step:

PotatoesPotatoes1 piece
CabbageCabbage1 piece
OnionOnion1 piece
WaterWater1 piece

Tools needed:

SaucepanSaucepan
Maple Cutting Board BlankMaple Cutting Board Blank
Stainless Steel Mixing Bowl (Large)Stainless Steel Mixing Bowl (Large)
StopwatchStopwatch
9

A knife that wobbles, teeth that clog

Masher, pounder and mincer troubleshooting.

Flow

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10

History and honest limits

**Jacob J. Diehl** of York, Pennsylvania, received US 93,862, dated 17 August 1869. The masher is of ordinary form with a plate or metallic block of pyramidal teeth fixed to it; the knife need not be removed when mashing. He did not claim combining a cleaver and steak pounder, which was known, but the detachable knife through the handle and its fit in the plate. **Honest limits.** A printed head stands in for wood and metal, and is lighter than cast iron. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times are the result.

Materials

10

Tools Required

15

Design Files

1

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CC0 Public Domain

This blueprint is released under CC0. You are free to copy, modify, distribute, and use this work for any purpose, without asking permission.

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