Step 01
Add hot water
Remove the cup lid, fill the insulated thermos vessel with hot water, close it securely and turn the body upside down to prepare the brewing chamber.
Industrial Design · Registered 2025
Stakarts® Kaffer
Multifunctional Coffee Grinder & French Press Brewing System
◆ Conical Ceramic Burr
◆ Integrated French Press
◆ Vacuum Insulated Thermos
◆ Patented Bidirectional Drive
01 · Concept & Ideation
Fresh coffee, wherever the route leads.
Kaffer combines the equipment needed for grinding and brewing into one insulated, travel-ready object. A 15–18 gram dose becomes a single fresh cup, while a ceramic burr supports an even grind without introducing a metallic taste. The airtight construction and direct controls keep the ritual simple.
02 · The User Ritual
One body. Grind, brew, and pour.
The grinder and French press are integrated directly into the thermos. Ground coffee stays separated inside the brewing chamber, and the finished coffee pours cleanly into the drinking cup without extra equipment.
Step 02
Prepare the grinder
Detach the grinder module from the body, remove the liquid protection sealing lid, and secure the grinding mechanism back in place.
Step 03
Load coffee beans
Open the top lid and add a measured 15–18 g dose of coffee beans into the transparent acrylic chamber.
Step 04
Lock the chamber
Securely seal the bean chamber with the upper lid. The transparent acrylic window confirms full seating and allows continuous visual monitoring prior to grinding.
Step 05
Grind and brew
Rotate the upper body in either direction. Each manual turn drives the ceramic burr grinder while advancing the internal French press plunger mechanism through the water.
Step 06
Press to pour
Once extraction is complete, depressing the release button allows the brewed coffee to flow cleanly from the chamber into the drinking cup without residual grounds.
04 · Engineering Architecture
Compact architecture, clearly resolved.
The section and technical drawings organise the grinder, filter chamber, press and insulated vessel along one vertical concentric axis. Hot water reaches the freshly ground coffee gradually before the brew is released into the cup.
Sectional view highlighting internal spiral bevel grinder, coffee grounds funnel, and stainless steel strainer.
Volumetric section through the upper grinding housing and transmission interfaces.
Lower section showing stainless steel filter screen and thermos chamber seals.
Technical orthographic CAD drawing showing exterior tolerances and assembly dimensions.
Full vertical sectional drawing highlighting internal concentric component clearances.
05 · Kinematic Transmission
One shaft, two motions.
The central shaft turns with the grinder to drive the conical ceramic burr while simultaneously advancing the French press through the hot water. A single manual gesture connects grinding and brewing in one continuous action.
Synchronized Bidirectional Drive
Rather than requiring multiple mechanical tools, the internal gearbox translates bidirectional rotation into uniform burr rotation and downward plunger translation. The ceramic burr ensures zero heat transfer and zero metallic taste degradation.
06 · Utility Model & Claims
Registered integrated brewing architecture.
Combining grinder, French press and thermos in a single axis, Kaffer is protected under an official Utility Model registration.
Figure 2 · 3D Perspective Section
Synchronized Power Transmission & Bi-Directional Drive
The hinged crank arm (3) leverages mechanical advantage to rotate the pinion gear (3.1) and conical burrs (2) while simultaneously driving the central worm shaft (4) to linearly advance the stainless filter strainer (5) through the water reservoir (7).
Figure 6 · Mechanism Detail Section
Worm Shaft & Calibrated Return Spring
Passing through the bean refill cap (1.1) and bean hopper (1), the worm shaft (4) translates rotation into controlled vertical travel. The calibrated return spring (10) ensures resilient torque absorption and functional continuity across bi-directional turns.
Figure 1 · Monolithic Exterior
Compact Silhouette & Tactile Ergonomics
Integrating a 15–18g whole bean hopper (1), glove-friendly tactile grip texture (9), transparent grind verification window (8), double-wall vacuum flask (7), and multi-purpose drinking cup cap (13) requiring no extra travel cups.
Figure 3 · Vertical Coaxial Assembly
Directional Grounds Funnel & Vacuum Seal
The concave grounds funnel (11) channels fresh grinds through 3 radial slots directly onto the stainless strainer to initiate siphon infusion, while the vacuum-sealed push-button inner lid (12) guarantees zero-leakage transport and controlled serving.
07 · Component Anatomy
A complete coffee ritual, part by part.
Stainless steel, aluminium, food-safe polymer and silicone components build a durable, serviceable system around the ceramic burr, filter chamber and insulated body.
Exploded assembly showing the complete registered component sequence from cap to thermos base.
Exterior & Thermos
- a Steel thermos body
- c Stainless steel bottom cover
- f Insulated steel thermos flask
- h Bronze metal grip ring
- j ABS engineered thermos lid
- u Translucent silicone grip ring
Grinder & Hopper
- b Lower grinder housing section
- k Lower coffee grinder section
- o Upper section of coffee grinder
- p Conical ceramic grinder burr
- r Grinder main body chassis
Transmission & Press
- d Stainless steel mesh filter
- e Filter chamber housing
- g Powder transfer funnel connector
- l Lower mechanism holder
- m Three-way rotating component
- n Aluminum calibrated spring
- s Retaining nut
- t Precision alignment pin
08 · Field Performance
Engineered for mountain routes and outdoor rituals.
Field tested in harsh alpine conditions. Vacuum insulation maintains brewing temperature, while tactile silicone ensures a secure grip even with gloves.
Field testing on alpine winter terrain.
Turkish Patent Institute · Registered Utility Model & Industrial Design
Designed with Intention. Verified by Law.
Officially registered by the Turkish Patent and Trademark Office (TR 2025 011229). Explore project renders on Behance.
View Case Study on Behance