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Патент USA US2116043

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May 3, 1938.
J, H, ROWE '
2,116,043
ELECTR ICALLY OPERATED TOOL
Filed May 16, 1955
Inventm'
Attorney
Patented May 3, 12938
2,116,043
UNITED STATES PATENT OFFICE
2,116,043
ELECTRICALLY OPERATED TOOL
John H. Rowe, Grangeville, Idaho
Application May 16, 1935, Serial No. 21,909
4 Claims.
My invention relates generally to electrically
operated tools, and particularly to a device of
this kind which is more compact and is entirely
enclosed except for the working bit.
Another important object of my invention is to
provide a device of the character indicated in
which different forms of bits, such as nail ?les,
nail buffers, and the like may be interchangeably
installed for use.
10
Another important object of my invention is
to provide a device of the character described in
which there are no parts subject to relatively
rapid wear, the device being devoid of brushes
and having only one principal moving part.
15
Other objects and advantages of my invention
will be apparent from a reading of the following
description in connection with the drawing,
wherein for purposes of illustration I have shown
20
25
a preferred embodiment of my invention.
In the drawing:
Figure 1 is a general side elevational view of
an embodiment of the invention showing the
same equipped with a bit, the bit being shown in
phantom lines.
Figure 2 is alongitudinal vertical sectional
View taken, through Figure 1 approximately on
the line 2-—2.
Figure 3 is a transverse vertical sectional view
taken through Figure 1 approximately on the
30 line 3-—3.
Referring in detail to the drawing, the numeral
5 generally designates a hollow generally cylin
drical elongated casing which would be prefer
ably made of nickel iron or a composition insulat
35 ing cover shaped to ?t the hand and be inter
nally threaded at its open side as indicated by
the numeral 6 to receive the reduced threaded
part 1 of the cap 8, and the cap 8 is provided
with a central axial bore 9.
40
The opposite end of the container has an open
ing H! in which is located a rubber grommet H
which insulates and protects the passage into
the interior of the casing of the alternating cur
rent conductors I2.
45
Slidable in the bore 9 is the armature shaft 13
which has on its outer end a chuck l4 provided
with a clamping set screw l5 or other holding
device for connecting the desired working point
or tool to the shaft 13.
50
Within the cap‘ 8 the shaft [3 is threaded as
indicated by the numeral I 6 to accommodate the
spring tensioning nut I‘! which abuts the small
end of the conical spiral spring l8 which is cir
cumposed on the shaft l 3 and has its large inner
55 end engaging the iron washer is which has the
(Cl. 172-126)
opening 20 in which the reduced part of the T
shaped cross section armature 2| works, the re
duced portion of the armature having a threaded
socket in which the threaded terminal 22 of the
armature shaft I3 is threaded.
The washer i9 is concentrically spaced from
the interior of the casing 5 and forms a continu
ation of the core to be described. An iron sleeve
23 concentric with the Washer I9 is disposed and
held in position between the inner end of the 10
cap 8 and the right hand side of the washer as
shown in Figure 2. A brass sleeve shorter than
the sleeve 23 is similarly disposed with respect
to the opposite side of the washer I9 and abuts an
insulating washer 24. The opposite side of the 15
washer ‘Z4 abuts the right hand end of the wire
winding 25 and the opposite end of the winding
abuts another insulating washer 26.
ut-shaped laminations of magnetically per~
meable metal which are designated 21 have the 20
inner legs 28 disposed within the hollow winding
25 and the outer legs disposed outside of the
winding and along the interior of the casing 5
toward the right as far as and to overlap the
washer 24, the brass sleeve, the iron washer, and
the iron sleeve 23, as clearly indicated in Figure
2 whereby to hold these parts in their proper re
lationship.
The inner and outer sides of the winding are
properly insulated by such material as impreg» 30
nated linen from the inner and outer core legs,
the outer core legs being designated 29.
With the alternating current coming into the
winding 25 and the spring l8 properly adjusted,
the head of the armature 21 which is adjusted to 35
initially closely approach the end of the core ad
jacent thereto, will be alternately attracted to~
ward and released from the core, so as to recipro
cate the armature shaft l3 and give the neces
sary reciprocating motion to the tool bit which 40
may be connected to the clamping chuck l4.
Although I have shown and described herein a
preferred embodiment of my invention, it is to
be de?nitely understood that I do not desire to
limit the application of the invention thereto, 45
and any change or changes may be made in the
materials, and in the structure and arrangement
of the parts, within the spirit of the invention
and the scope of the subjoined claims.
What is claimed is:—
50
1. An electrical tool comprising a tubular cas
ing, an electro-magnet lying along said casing
and having one end spaced from the adjacent end
of said casing, a cap closing said adjacent end of
the casing and removably threaded therein, said 55
2
2,116,043
cap being formed with a bore, a longitudinally
recip-rocable shaft slidably supported in said bore
within said casing and axially spaced from said
cap to de?ne a chamber, a partition in said cham
and having its axially outer end formed with a
ber and spaced from said electro-magnet and
tool chuck, a magnetizable partition disposed in
said casing intermediate saidcap and the ad
jacent end of said electro-magnet, said magnet
from said cap‘, non-magnetizable means spacing
said partition from said electro-magnet, a mag
netizable head located in the space between said
izable partition being formed with a bore, an
armature comprising a magnetically permeable
head located at the magnet side of said partition,
ing a shank slidably supported in a bore formed
in said partition, a sleeve having one end engaged
10 said head having a reduced shank slidably en
gaging the last-mentioned bore, means con
necting said reduced shank and the axially in
ward end of said recip-rocable shaft, a stop’ on
said shaft axially outwardly spaced from said
15 shank, and an expanding spring interposed be
tween said partition and said stop and normally
retracting said armature away from said electro
magnet.
2. An electrical tool comprising a tubular di
20 electric casing, an electro-magnet lying along
said casing and having one end spaced from one
end of said casing, said electro-magnet including
a core, a cap closing said one end of the casing
and removably threaded therein, said cap being
25 formed with a bore, a longitudinally reciprocable
shaft slidably supported in said bore and having
its axially outer end formed with a tool chuck,
a magnetizable partition disposed in said casing
in axially spaced relation to said electro-magnet,
said magnetizable partition being formed with a
bore, an armature comprising a magnetically
permeable head located at the magnet side of
said partition, said head having a reduced shank
slidably supported in the last-mentioned bore,
35 means separably connecting said reduced shank
and the axially inward end of said reciprocable
shaft, a stop on said shaft spaced axially out
wardly from. said shank, an expanding spring in—.
terposed between said partition and said stop
40 and normally retracting said armature away from
said electro-magnet, said core having a longitudi
nal extension reaching to and contacting said
magnetizable partition.
3. An electrical tool comprising a generally
cylindrical elongated outer casing closed at one
end and open at its opposite end, a cap removably
threaded on and closing said opposite end of the
‘casing, an armature shaft slidably supported by
a bore formed in said cap, an electro-magnet
partition and said electro-magnet, said head hav
with said partition and its opposite end engaged 10
with a portion of said cap, said partition and said
sleeve being thereby held in place by said cap,
with said armature shaft extending through said
sleeve, means operatively connecting the axially
inward end of said armature shaft with said
shank, a stop- on said shaft adjacent said cap, and
a helical spring interposed on said shaft and op
eratively mounted between said stop and said
magnetizable partition.
4. An electrical tool comprising a generally 20
cylindrical elongated outer casing closed at one
end and open at its opposite end, a cap removably
threaded on and'closing said opposite end of the
casing, an armature shaft slidably supported by
a bore formed in said cap, an electro-magnet 25
within said casing and axially spaced from said
cap to de?ne a ‘chamber, a partition in said
chamber and spaced from said electro-magnet
and from said cap, non-magnetizable means spac
ing said partition from said electro-magnet, a
magnetizable head, located in the space between
said partition and said electro-magnet, said head
having a shank slidably supported in a bore
formed in said partition, a sleeve having one end
engaged with said partition and its opposite end 35
engaged with a portion of said cap, said partition
and said sleeve being thereby held in place by
said cap, with said armature shaft extending
through said sleeve, means operatively connect
ing the axially inward end of said armature shaft 40
With said shank, a stop on said shaft adjacent
said cap, and a helical spring interposed on said
shaft and operatively mounted between said stop
and said magnetizable partition, said partition
and said sleeve being of magnetizable material,
and said electro-magnet being provided with an
extension contacting both said partition and said
sleeve.
JOHN H. ROWE.
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