Manufacturers Index - Hugo Bilgram, Bilgram Machine Works
Hugo Bilgram, Bilgram Machine Works
Philadelphia, PA, U.S.A.
Manufacturer Class:
Metal Working Machinery
This page contains information on patents issued to this manufacturer.
Submitting Patent Information
If you find a patent number or patent date by this manufacturer that is not on this
list, please contact the Site Historian.
Key to Links for Patent Information
USPTO = U.S. Patent Office .
Images of the actual patent can be viewed on the U.S. Patent Office web site but
a special TIFF viewer must be installed with your browser in order properly work.
More information on how to configure your computer to view these patents can be
found at TIFF image Viewers
for Patent Images.
DATAMP = Directory of American Tool And
Machinery Patents . A sister site to VintageMachinery.org with information
on patents related to machinery and tools. A much easier user interface than the
USPTO's for finding information on machinery patents.
|
133,192
|
Nov. 19, 1872
|
Improvement in steam-engine governors
|
Hugo Bilgram |
Philadelphia, PA |
|
|
158,669
|
Jan. 12, 1875
|
Improvement in cut-off valve-gears
|
Hugo Bilgram |
Philadelphia, PA |
|
|
164,132
|
Jun. 08, 1875
|
Improvement in cut-off-valve gears
|
Hugo Bilgram |
Philadelphia, PA |
|
|
289,607
|
Dec. 04, 1883
|
Metal-planer
|
Hugo Bilgram |
Philadelphia, PA |
|
|
294,844
|
Mar. 11, 1884
|
Bevel-gear cutter
|
Hugo Bilgram |
Philadelphia, PA |
|
|
455,787
|
Jul. 14, 1891
|
Balance-wheel for time-pieces
|
Hugo Bilgram |
Philadelphia, PA |
|
|
506,412
|
Oct. 10, 1893
|
Cigarette-machine
|
Hugo Bilgram |
Philadelphia, PA |
We're not sure why this inventor, known for his gear-making machinery, designed a machine for making cigarettes. The machine must have been successful as it was also patented in England, Brazil, Spain, and Mexico. |
|
508,196
|
Nov. 07, 1893
|
Machine for grinding the edges of spectacle or eyeglass lenses
|
Hugo Bilgram |
Philadelphia, PA |
|
|
|
|
Machine for grinding the edges of spectacle or eyeglass lenses
|
Thomas A. Willson |
Reading, PA |
|
|
565,851
|
Aug. 11, 1896
|
Cigarette-machine
|
Hugo Bilgram |
Philadelphia, PA |
|
|
572,150
|
Dec. 01, 1896
|
Cigarette-machine
|
Hugo Bilgram |
Philadelphia, PA |
|
|
634,102
|
Oct. 03, 1899
|
Paper-bag machine
|
Hugo Bilgram |
Philadelphia, PA |
|
|
655,668
|
Aug. 07, 1900
|
Mechanism for feeding sheets of paper, &c.
|
Hugo Bilgram |
Philadelphia, PA |
|
|
|
|
Mechanism for feeding sheets of paper, &c.
|
Oscar L. Schehl |
Philadelphia, PA |
|
|
656,340
|
Aug. 21, 1900
|
Bag-machine
|
Hugo Bilgram |
Philadelphia, PA |
|
|
665,054
|
Jan. 01, 1901
|
Gear-cutting machine
|
Hugo Bilgram |
Philadelphia, PA |
|
|
749,683
|
Jan. 12, 1904
|
Process of shaping gear-teeth
|
Hugo Bilgram |
Philadelphia, PA |
Robert S. Woodbury's 1958 monograph, "History of the Gear-Cutting Machine", identifies this Bilgram patent as an especially important one in the history of gear cutting. At the time of this patent, the automobile industry was motivating much work in improving machine tools. The challenge with gear design was that theoretically perfect gear teeth could be noisy in practice. This patent specification notes that existing gear-tooth designs have the force transmitting either evenly through two teeth or entirely by one tooth, alternating between the two states as the gears rotate. Bilgram's idea was a new tooth shape where a tooth gradually assumes a larger share of the force as the gears rotate, this force then gradually decreasing as the next gear-tooth engages. A separate patent covered an additional improvement that slightly relieved the points and bases of the teeth to allow for misalignment due to bearing play and shaft flex. Both of these patents are improvements to the inventor's earlier patents 294,844 and 656,166. |
|
749,606
|
Jan. 12, 1904
|
Gear-cutting machine
|
Hugo Bilgram |
Philadelphia, PA |
This gear cutting machine is designed to cut a tooth profile that varies slightly from the "ideal" mathematically determined profile so that the load on a tooth gradually increased to a maximum and then falls off as the next tooth comes into engagement. This avoids the humming noise that comes from the ideal tooth where the load is shared equally across two teeth and until one of them falls out of engagement and then the entire load is suddenly transferred to the other tooth. |
|
955,113
|
Apr. 12, 1910
|
Continuous-cigarette-cutting machine
|
Hugo Bilgram |
Philadelphia, PA |
|
|
RE13,502
|
Dec. 31, 1912
|
Gear-cutting machine
|
Hugo Bilgram |
Philadelphia, PA |
|
|
1,187,295
|
Jun. 13, 1916
|
Stamp applying and affixing machine
|
Carl Feddern |
Philadelphia, PA |
This machine is for applying revenue stamps to tobacco cans. |
|
|
|
Stamp applying and affixing machine
|
Hugo Bilgram |
Philadelphia, PA |
|
|
|
|
Stamp applying and affixing machine
|
Louis Fischer |
Philadelphia, PA |
|
|
1,251,466
|
Jan. 01, 1918
|
Automatic braking device for compensation-gears of automobiles and other similar vehicles
|
Hugo Bilgram |
Philadelphia, PA |
|
|
1,277,837
|
Sep. 03, 1918
|
Automatic braking device for compensation-gears of automobiles and other similar vehicles
|
Hugo Bilgram |
Philadelphia, PA |
|
|
1,798,059
|
Mar. 24, 1931
|
Machine for making rotors
|
Hugo Bilgram |
Philadelphia, PA |
|
|
|
|
Machine for making rotors
|
Myron F. Hill |
Bridgeport, CT |
|
|