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Marquardt Series 6184

Contents

Overview

Series 6184 is a series of keyboard switches from Marquardt. Marquardt reported that the series was introduced in 1987, and discontinued in 2000 after a change of focus at Marquardt and competition from the Far East.

The 4 mm travel momentary linear design is well-known, while the alternate action and 2.5 mm travel types are not known to have been discovered.

Features

Specifications

Marquardt provided drawings for models 6184.0101 (linear momentary with 4 mm travel) and 6184.1204 (linear momentary illuminated with 2.5 mm travel), which can be found under Documentation below. The specifications below are derived solely from these documents, and may not represent the complete product range.

Switching voltage 28 V maximum
Switching current 50 mA maximum
Pretravel 1.5±0.5 mm 2.0±0.5 mm
Total travel 2.5±0.3 mm 4.0±0.3 mm
Operating force (linear) 67.5±17.5 cN 55±15 cN

Models

The table of models below is taken from an advertisment in Electronic Engineers Master 1989–1990 Volume 2, which can be found under Documentation below.

Part number Travel Type Feel LED/diode
6184.0101 4 mm Momentary Linear None
6184.0201 Red LED
6184.0202 Green LED
6184.0204 Yellow LED
6184.0301 Diode
6184.0701 Tactile None
6184.0801 Diode
6184.0501 Alternate action ? None
6184.0601 Red LED
6184.0602 Green LED
6184.0604 Yellow LED
6184.1101 2.5 mm Momentary Linear None
6184.1201 Red LED
6184.1202 Green LED
6184.1204 Yellow LED
6184.1301 Diode
6184.1701 Tactile None
6184.1801 Diode

Tactile version

For now, it is assumed that the “tactile” type is the click-tactile type that has now been obtained surplus NOS, without any identification.

The tactile types are externally identical to the linear types. Internally, there is a plastic frame containing two prongs, with knobs at the end. A pair of wedges on the reverse side of the plunger force these prongs apart, which snap back with a loud and sharp click sound. The tactile sensation is strong and sharp.

The images below depict what is assumed to be model 6184.0701: tactile, 4 mm travel, no LED or diode.

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Opened
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Opened
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Click mechanism
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Click mechanism
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Contact assembly
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Contact assembly
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Contact assembly
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Contact assembly
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Contact assembly

These switches even more so than the linear types are best reassembled upside down, by placing the contact assembly, plunger and spring (and in the case of these, the click frame) into the lid, and then placing the base over the top. The actuator leaf must be placed onto the contact module as depicted above, before the two are inserted into the lid together.

Keyboards

Documentation