Louis Heinrici

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Louis Heinrici (born July 30, 1847 in Torgau , † probably 1930 in Zwickau ) was a German industrialist and manufacturer.

person

Little is known about the person of the manufacturer Louis Heinrici, but his products are better known. Louis Heinrici was married to Marie Elisabeth Heinrici, b. Deustler, with whom he had three sons: Joseph Hans Louis Heinrici, Ernst Hermann Heinrici and Rudolf Heinrici.

factory

Louis Heinrici began manufacturing hot-air engines and small engines in rented rooms in 1876 at the age of 29 . He built his first factory building in 1884 in Zwickau (Saxony), at Talstrasse 6. He started the factory with two workers, a lathe and a field forge .

The official company name was: Louis Heinrici, mechanical workshops for precision work, Zwickau in Saxony

The hot-air engines produced by Heinrici were widely used as a mass product in the commercial and private sectors because they served as inexpensive and reliable sources of power.

  • Interior view of the factory: Lower Turning Hall 1

  • Interior view of the factory: Lower rotary hall 2

  • Factory interior view: laboratory and tasting room for testing

  • Interior view of the factory: Upper turning room

In 1914 the factory had the following sections: a building for the locksmith's shop, plumbing shop, paint shop, another building for the lathe shop with an upper and a lower turning room and a laboratory and testing room for test runs, as well as an office building for sales offices and warehouses. In the park-like gardens of the turning shop and the office building there were fountains with a diameter of 4 meters. These were provided with decorative spraying garden fountains that were driven by Heinrici motors.

  • Heinrici factory: locksmith's shop, plumbing shop, paint shop

  • Heinrici factory: turning shop - the garden fountain was driven by a Heinrici motor

  • Heinrici-Fabrik: Kontorgebäude - office building and warehouse

  • Heinrici factory: side view of the office building - the garden fountain was driven by a Heinrici motor

In 1914 the catalog of the then 67-year-old Louis Heinrici reads: Today after 38 years of activity, I am still producing the same large-scale article that I - thanks to a thorough study of all the scientific and technical questions relevant to the construction of such machines, as well as tireless striving for the most attainable perfection - put it first in world trade.

After 38 years, Heinrici was able to demonstrate a total of 21,000 machines sold.

Products

Heinrici hot air motors in 12 sizes
Heinrici catalog from 1914

For several decades, Louis Heinrici built various small hot air machines in twelve sizes from 26 to 190 mm piston diameter and in the power ranges from 1.5 W to 0.2 kW. The machines worked with a closed cooling circuit in the upper area, while air cooling was sufficient in the lower area. The speed of the running machine was between 120 and 200 revolutions per minute under load. With a piston diameter of 26 mm, the output was 1/550 HP, with a piston diameter of 40 mm = 1/60 HP, with 80 mm = 1/12 HP, with 100 mm = 1/8 HP and with a piston diameter of 190 mm = 1/2 HP.

The machines could be heated by gases, liquid or solid fuels (luminous gas, petroleum, wood). They weighed between 26 kg for the smallest and 660 kg for the largest machine.

Engineer E. Patzert, then a teacher at the engineering school in Zwickau , carried out braking tests on some Heinrici machines and stated in his test report: The test motors, all of which were freely selected from the number of machines completed, were characterized by their smooth, steady gait and were extremely undemanding in terms of lubrication and maintenance.

advantages

The advantages of the machines were:

  • noiseless operation,
  • slow running - minimal wear
  • no smell (exhaust fumes)
  • easy operation, ready for immediate use
  • completely safe
  • heatable with any fuel and electrically
  • Can be set up anywhere without official approval at the time.
  • no dependence on gas, electricity or water

scope of application

  • Drive of room fans and blowers
  • Shop window advertising rotating mechanism with turntables
  • Rotating mechanism for Christmas tree stands
  • Drive all types of water pumps
  • Operation of pond fountains and garden fountains
  • Generating electricity with dynamo
  • Mixers and shakers in hospitals, laboratories and chem. Industry

costs

The smallest machine with a piston diameter of 26 mm (KD) cost 30 marks at the time , which, compared with today's currency, multiplied by a factor of 8, would be around 240 euros. The following are the Heinrici machine catalog prices from 1914:

  • 30 mm KD = 40 marks
  • 40 mm KD = 75 marks
  • 45 mm KD = 85 marks
  • 54 mm KD = 96 marks
  • 65 mm KD = 130 marks
  • 72 mm KD = 180 marks
  • 80 mm KD = 220 marks
  • 100 mm KD = 290 marks
  • 130 mm KD = 620 marks
  • 150 mm KD = 745 marks
  • 190 mm KD = 960 marks

Patent numbers

  • DRP No. 213885 hot air machine with external heating
  • DRP No. 331855 hot air machine with internal heating

Web links

Commons : Louis Heinrici, Mechanische Werkstätten  - Collection of images, videos and audio files

Individual evidence

  1. ↑ Source: City Archives Zwickau v. September 11, 2008
  2. ↑ Source: City Archives Zwickau v. September 11, 2008
  3. ↑ Source: Heinrici hot air machine catalog from 1914 (preface)
  4. ↑ Source: Heinrici hot air machine catalog from 1914
  5. ↑ Source: Heinrici hot air machine catalog from 1914, p. 4
  6. ↑ Source: Heinrici hot air machine catalog from 1914, pp. 2–3
  7. ↑ Source: Heinrici hot air machine catalog from 1914
  8. ↑ Source: Heinrici hot air machine catalog from 1914 / foreword
  9. ↑ Source: Heinrici hot air machine catalog from 1914 / price list
personal data
SURNAME Heinrici, Louis
BRIEF DESCRIPTION German industrialist
DATE OF BIRTH July 30, 1847
PLACE OF BIRTH Torgau
DATE OF DEATH around 1930
Place of death uncertain: Zwickau