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Bifora 934

 

Bifora 934Bifora 934

Description

One of the standard movements from the german Bidlingmaier GmbH from Schwäbisch Gmünd, was the Bifora 934 with a diameter of 9 3/4 lignes (hence the caliber number), an pallet lever movement with a pillar construction.

Its construction is classical and simple: The balance (here in its best version as glucydur screw balance), which is beared in two inhose Bishock shock protection systems, controls a conventional pallet lever movement, which contains a decentral second at "6".

The hairspring is fix connected to the balance cock and regulated in its effective length by a long regulator arm with scale.

base platebase plate

The gear construction is classical-conventional with escapement wheel, fourth wheel, third wheel and minute wheel.

The latter gets its energy from the mainspring barrel, which contains its click spring on the dial side.

side view of the pillar constructionside view of the pillar construction

On the side view, you see the pillar construction, which was cheaper than using massive plates, but results in a larger thickness.

Bifora 934 dial sideBifora 934 dial side

On the dial side, there's the rocking bar winding mechanism and the click spring, which is very well made. You also see the rather large bearing rubies.

 

 Technical data

ManufacturerBifora
Caliber934
Number of jewels17
EscapementAnchor with pallets
BalanceGlucydur screw balance
Shock protection(s)Bidlingmaier (Bifora)
Balance cock directionclockwise
Hairspring studfixed
Regulator typeLong regulator arm
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center wheel
Mainspring barrel
Construction typepillar construction
Bridge shapeAxe, 4 gears
Winding mechanismRocking bar
Setting lever spring4 holes
Featuress
FunctionsHour, minute, small second
Beats per hour18000
Size93/4''' (measured: 21,0 mm)
Production time1946 - 1958
Image in Flume Werksucher 1957 35
Bifora 934BiforaBifora9341946 - 19589 3/4''''''Bifora 93417 Jewels, 9 3/4'''''', 18000 A/h, s
Factsheet

 

Timegrapher output

The specimen shown here, was completely gummed and cleaned and olied afterwards.

Nevertheless, the timegrapher outputs are very unsteady, especially in the vertical positions. And there, the positions "12 up" and "9 up" are pretty worse; the reasons can be a badly poised balance or a bent balance staff.

crown rightcrown right crown topcrown top crown leftcrown left crown bottomcrown bottom 
dial topdial top dial bottomdial bottom 

vertical positions
12 up  -240 seconds/day
3 up  -120 seconds/day
6 up  +6 seconds/day
9 up  -240 seconds/day
horizontal positions
dial down  +50 seconds/day
dial up  +45 seconds/day
timegrapher measurings

Usage gallery

Bifora mens' watchBifora mens' watch

 

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