Appeal No. 1997-2076
Application No. 08/175,718
are a switch for controlling the electric motor and a
transformer for supplying current to the motor at a frequency
higher than line frequency. More particularly, Appellant
indicates at pages 5 and 6 of the specification that the
switch and the transformer are combined in a common housing to
form a miniaturized built-in unit on the power supply cord.
Claim 1 is illustrative of the invention and reads as
follows:
1. An internal vibrator for compacting concrete and
having a vibrator housing in which is disposed an eccentric
mass and an electric motor for driving said eccentric mass,
said electric motor being supplied via a power supply cord
with electric current having a frequency that is greater than
line frequency, said power supply cord being disposed at least
in part in a protective and operating tube, said vibrator
further comprising:
switch means for controlling said electric motor, said
switch means being disposed in said power supply cord in the
vicinity of said protective and operating tube; and
a transformer for supplying to said electric motor said
electric current having said frequency that is greater than
line frequency, wherein said switch means and said transformer
are combined in a common housing to form a miniaturized built-
in unit on said power supply cord.
The Examiner relies on the following prior art:
Spitler 2,924,730 Feb. 09,
1960
Strohbeck 3,782,693 Jan.
01, 1974
2
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