A By-pass Cock for Self-lighting Gas Burners.
Year: 1899

page_text: COMPLETE SPECIFICATION.
A By-pass Cock for Self-lighting Gas Burners.
I, AUGUST BACHMEYER, of No. 78, York Street, Westminster, in the County
of London, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
Many gas burners, especially those of incandescence kind are provided with
self-lighting appliances consisting usually of platinum or other suitable material
which when played on by a small jet of gas becomes sufficiently heated to ignite
the flame of the burner. My invention relates to the construction of a by-pass
cock for self-lighting burners so arranged that on partially turning it till it
meets a check, a small jet of gas is directed on the kindling appliance but no gas
passes to the burner, but on turning it beyond the check to its full extent, the
small jet is cut off but there is full supply of gas to the burner.
Figs. 1, 2 and 3 of the accompanying drawings are transverse sections of a
by-pass cock according to my invention, shewing its plug in its three positions.
Figs. 4 and 5 are respectively front and side elevations. The plug a which can
be turned by a handle 6 as far as permitted by a stop pin c meeting shoulders
of a washer d, has a passage e quite through it, and a segment f cut away at
one end of the passage. is the jet aperture for the burner and h is a small
pipe leading to the kindling appliance.
In the position shewn in Fig. 1 the gas supply is quite cut off. When the
plug is turned to the position shewn in Fig. 2 there is passage for gas to the
pipe leading to the kindling appliance but as yet no passage for gas to g to
supply the burner. In the position shewn in Fig. 3 there is full supply to g
but the supply to h is cut off.
If the plug could be freely turned from the position in Fig. 1 to that in
Fig. 3 this might be done so rapidly that there would not be sufficient time for
the gas passing by h to act on the kindling appliance, and therefore there would
be no lighting of the main flame. In order to provide a certain check to the move-
ment of the plug sufficient to retain it a little time in the position shewn in
Fig. 2, I cut in the inner face of the washer da recess having a sloping end
and in a hole in the body of the cock I fit a spring plunger having a coned
end. When the plug is in the position shewn in Figs. 1 and 5 the end of the
spring plunger 7 is in the recess k. On turning the plug to the position shewn
in Fig. 2 the end of the plunger meting the end of the recess opposes
the farther turning of the plug, requiring the operator to apply greater force,
so that the sloped end of the recess k may push in the plunger in opposition
to the spring and then the plug can be fully turned. The check thus offered to
the turning of the plug past its middle position causes a little time to pass while
it is in this position, and though this is little more than a momentary delay,
it is sufficient to allow the gas passing by h to heat up the kindling appliance.
Obviously instead of a spring plunger acting in a recess on the face of the
washer, a spring acting on a notch on the periphery of the washer, or other
means of checking the turning movement of the plug might be adopted.
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