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Jobu Mekaniske Verksted AS (Jobu Mechanical Manufacturers) in
''Teknisk utvikling i skogbruket''
{{webarchive, url=https://web.archive.org/web/20131213080111/http://www.skogsnorge.no/modules/SOI_Forsker/forskersvar.asp?ID=4708 , date=2013-12-13 , Skogsnorge.no The company produced
Johnson and Busk were themselves responsible for the construction of the first commercial chainsaw, "Jobu Senior," which had an "Aspin" engine with a standard carburetor with float chamber. Whenever the saw was placed on the side, the carburetor had to be rotated accordingly. Jobu Senior weighed 17.5 kg and was only applicable for felling and bucking.
The next model was Junior, which was released on the market in 1952. The engine in Junior was manufactured by Jobu themselves. Junior came with its predecessor carburetor solution that still had to be rotated. The weight was reduced to 10.4 kg. This saw became very popular, and around 40 000 units were produced. Jobu Tiger, which came in 1960, was a major advance. This model had a
Drøbak Drøbak is a List of cities in Norway, town and the centre of the municipality of Frogn, in Viken county, Norway. The city is located along the Oslofjord, and has 13,409 inhabitants.
History
Drøbak and Frogn was established as a parish on its o ...
, Norway, was founded in 1947 by timber merchant Trygve Johnsen and gunsmith
A gunsmith is a person who repairs, modifies, designs, or builds guns. The occupation differs from an armorer, who usually replaces only worn parts in standard firearms. Gunsmiths do modifications and changes to a firearm that may require a very h ...
Gunnar Busk in 1947.Jensen, A., ''Motorsager i Norge'', Arnulf Jensen, 2010.Johnsrud, T.E.''Teknisk utvikling i skogbruket''
{{webarchive, url=https://web.archive.org/web/20131213080111/http://www.skogsnorge.no/modules/SOI_Forsker/forskersvar.asp?ID=4708 , date=2013-12-13 , Skogsnorge.no The company produced
chainsaw
A chainsaw (or chain saw) is a portable gasoline-, electric-, or battery-powered saw that cuts with a set of teeth attached to a rotating chain driven along a guide bar. It is used in activities such as tree felling, limbing, bucking, pruning, ...
s and other forestry machines in the period 1948 to 1979. The brand continued until 1983.
Johnson and Busk were themselves responsible for the construction of the first commercial chainsaw, "Jobu Senior," which had an "Aspin" engine with a standard carburetor with float chamber. Whenever the saw was placed on the side, the carburetor had to be rotated accordingly. Jobu Senior weighed 17.5 kg and was only applicable for felling and bucking.
The next model was Junior, which was released on the market in 1952. The engine in Junior was manufactured by Jobu themselves. Junior came with its predecessor carburetor solution that still had to be rotated. The weight was reduced to 10.4 kg. This saw became very popular, and around 40 000 units were produced. Jobu Tiger, which came in 1960, was a major advance. This model had a diaphragm carburetor
A carburetor (also spelled carburettor) is a device used by an internal combustion engine to control and mix air and fuel entering the engine. The primary method of adding fuel to the intake air is through the venturi tube in the main meterin ...
that worked in all positions.
Jobu was for a long time the market leader in Norway
Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and t ...
. In the latter half of the 1960s and in the 1970s Jobu saws were also exported to various countries in Europe and even the United States.
Jobu produced several different options for their chainsaws. Best known is a propeller that converted the chainsaw to an outboard motor. This was available for both Senior and Junior Jobu. They also produced an auger
Auger may refer to:
Engineering
* Wood auger, a drill for making holes in wood (or in the ground)
** Auger bit, a drill bit
* Auger conveyor, a device for moving material by means of a rotating helical flighting
* Auger (platform), the world's f ...
for Junior Tiger .
The company was later purchased by Christiania Spigerverk
Christiania Spigerverk is a steel company which was founded in Oslo in 1853 and developed into one of the largest industrial companies in Norway. In 1972 Christiania Spigerverk combined with Elkem, to become Elkem Spigerverket. It was sold to ...
in Oslo, which later merged with Elkem
Elkem is a company that produces silicones, silicon, alloys for the foundry industry, carbon and microsilica, and other materials. Elkem was founded in 1904, has more than 7,000 employees and fields 30 production sites worldwide. Elkem has an oper ...
to become Elkem Spigerverket. In 1983 it was sold to Electrolux
Electrolux AB () is a Swedish multinational home appliance manufacturer, headquartered in Stockholm. It is consistently ranked the world's second largest appliance maker by units sold, after Whirlpool.
Electrolux products sell under a variety ...
in Sweden, and the production of Jobu-saws was terminated.
References