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Патент USA US2286176

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June 9, 1942.
2,286,1 76
Filed Oct. 25, 1958
Patentecl June 9, 1942
Earl D. Boisselier, Glen Ellyn, 111., assignor, by
mesne assignments, to Earl Products Company,
Chicago, 111., a corporation of Illinois
Application October 25, 1938, Serial No. 236,953
2 Claims. (Cl. 172-126)
This invention relates to motor assemblies for
provided with openings C’ which permit of air
use in connection with engraving apparatus, and
circulation within the handle or casing A, and
more particularly to a motor assembly for use
with a central bottom opening I for receiving
with a so-called tapping tool especially adapted
the reduced end portion 2 of a stud 3.
for making stippled designs in light sheet metal
The said reduced portion of the stud may be
or similar surfaces.
One of the objects of the invention is to pro
riveted or peened or otherwise turned over the
edges of the metal of the cap surrounding the
vide a construction which includes a novel mo
opening I to rigidly fasten the stud 3 to the cap.
tor assembly possessing special features of con
In that connection, it will also be observed that
struction which lend themselves to standard 10 the reduced portion 2 of the stud passes through
manufacturing practices, and thereby make it
a suitable opening in the transverse web portion
possible to provide a relatively inexpensive, sub
4 of a frame which includes the upstanding arms
stantial, and highly efficient unit.
5—5. Thus, when the reduced portion 2 of the
A further object of the invention is to provide
stud 3 is passed through the transverse member
a construction in which the novel motor assem
of the frame and the opening I of the cap, and
bly may be readily combined with a handle which
riveted or peened as indicated at 2a; the stud, the
not only constitutes a housing for the motor,
frame, and the cap will all be rigidly locked to
but at the same time affords convenient means
gether as one piece.
for gripping and manipulating the tool.
The-stud 3 is provided with a central opening
With the above and other objects in view which '
will more readily appear as the nature of the
invention is better understood, the same consists
in the novel construction, combination and ar
rangements of parts hereinafter more fully de
scribed, illustrated and claimed.
A preferred and practical embodiment of the
invention is shown in the accompanying draw
ing, in which:
Figure 1 is a side elevation of the improved
motor assembly.
Figure 2 is an enlarged vertical section of the
improved motor assembly.
or bore 3a which serves as a guide for the shank.
of a tool such as a tapping point or pin P. Thev
upper portion of the opening or bore 3a in the:
stud is enlarged as indicated at 312 to provide a.
chamber or socket for a coil spring 6 which sur
rounds the upper portion of the pin P adjacent.
a solenoid type armature member ‘I. Since the.
spring 6 is con?ned between the bottom of the:
socket in the stud and the underside of the sole-4
noid type armature, it will be apparent that the
said armature 1 as well as the pin P will nor
mally be urged upwardly in the bore of the stud.
Acoil 8 surrounds the stud and armature, the
said coil being positioned between the arms 5—5
of the frame. As will be apparent from Figure
Figure 3 is a detail sectional view of the top
portion of the motor assembly taken at right
angles to Figure 2.
35 2, the upper portions of the arms 5-5 are ex
Figure 4 is a top plan view of the motor assem
truded inwardly as indicated at 9 to engage the
bly shown in Figures 2 and 3.
top of a coil 8 and hold it in position. In as
Figure 5 is a diagrammatic view illustrating
sembling, the inherent resiliency of the arms
the ‘electric circuit employed.
5—5 permits them to be spread apart su?iciently
Figure 6 is a detail perspective view of the im 4-0 to permit the coil 8 to be moved over the arma
proved motor assembly.
ture ‘I and the stud 3. When the coil is in place
Similar reference characters designate corre
the arms 5—5 may be drawn together, thus
sponding parts throughout the several ?gures of
bringing the extruded portions 9 into overlying
the drawing.
and holding engagement with the upper end of
According to the embodiment of the invention 45 the coil.
shown in the drawing, the same includes in its
With further reference to the upper portions
organization a hollow handle A made of wood
of the arms 5—5, it may be pointed out that the
or other insulating material, and the tapping
same are provided with suitable slots [0 for re
unit B. This unit has rigid therewith a cap or
ceiving a transverse insulation piece II. This
cup portion C which is preferably of stamped 50 insulation piece is provided with a central open
metal, and closes the lower end of the handle.
ing [2 to clear the armature pin or insulation
That is to say, this cap or cup member C‘ is in
element I3 carried by the upper end of the
tended to receive the reduced end portion A’
armature 1. This insulation bridge piece consti
of the handle or casing A as shown by dotted
tutes an abutment or stop for the armature 1,
lines in Figure 2. Moreover, said cup is also 55 thus limiting the upward movement of the arma
ture under the force of the spring 6, and pre
venting the armature pin from unduly punishing
sembly comprising a solenoid coil, a tool actu
ating armature reciprocable in said coil, mount
ing means for said coil comprising a pair of arms
the contacts, later referred to.
Moreover, it will be observed that the upper
means on said arms to secure the coil between said
extremities of the arms 5-—5 are bent inwardly
as indicated at I4 and provided with relatively
narrow tongues l5 which in turn provide shoul
coil, said coil being effective, when energized, to
arms, spring means tending constantly to urge
said armature in one direction relative to said
move said armature in the opposite direction rel
ative to said coil, an insulating disc held by
extremities of the tongues I5 are twisted so as to
pull the entire ?bre plate or disc l6 against the 10 said arms in ?xed relationship to said coil and
limiting movement of said armature by said
shoulders formed at the base of the tongues I5.
spring means, an insulating strip held .by said
ders for supporting a top insulation disc 16. The
The insulation disc I6 carries a pair of spring
contacts i8 and I9. The contact 18 is connected
with the coil 8 by the lead l8a shown in Figure
arms in ?xed relationship to said coil, a switch
controlling supply of current to said coil, said
switch comprising a pair of contacts carried by
3a and the contact 19 is connected with the line 15 said insulating strip, a yieldable mounting for
wire 20. The coil 8 has its other terminal con
at least one of said contacts tending constantly
nected with the line-wire 2| as will be seen
to urge it away from the other contact, and
from Figures 3 and 5.
means whereby said armature, when urged
As shown in Figure 2, the points of the con
against said stop means by said spring means,
tacts l8 and 19 will be normally held in en
holds said yieldably mounted contact engaged
gaged relation by the pressure exerted through
With the other contact thereby completing the
the insulation element I3 carried by the solenoid
coil circuit, and releases said yieldably mounted
or armature l which is urged upwardly by the
contact to permit it to separate from the other
spring 6. Thus, when the line wires 20' and 2|
contact when the coil is energized and the arma
are plugged into a service outlet, the circuit 25 ture thereby is moved against said spring means.
will be completed through the coil 8v and thus
2. A tool operating reciprocating motor as
pull the armature 1 toward the center of the
sembly comprising a stud having an interior bore
coil. When the armature is thus pulled down
and a spring receiving socket, and also reduced
wardly, the insulation element l3'will be moved
in external diameter at one end, a frame in
away from the contacts I8 and I9 and the latter 30 cluding a pair of arms connected by a transverse
will spring apart or separate as shown in Figure
portion having an opening, a cup also having an
5 thus breaking the circuit.
As soon as the
opening, the openings of the transverse portion
circuit is broken the spring 6 will again exert
its influence to move the armature 1 upwardly
of the frame and‘ the cup registering and ?t
ting over the reduced end of the stud, a rivet
and in turn press the points of the spring con 35 portion formed at the extremity of the reduced
tacts i8 and I9 together as shown by the dotted
end of the stud to lock the cup and frame to the
lines in Figure 5, and also by full lines in Fig
stud, a coil ?tted over the stud and embraced by
ure 2.
said arms, inwardly directed portions on the
The above described electrical operation is
arms for engaging one end of the coil to hold it
repeated as long as the tool is connected in cir 40
in the arms, an armature in the coil and having a
cuit with a source of alternating current supply.
tool portion extending through said bore of the
The result of the electrical action is to produce
stud, a spring in the socket of the stud tending
a rapid vibration of the tapping point P so that '
when the tip of the point is held close to a sur
face to be stippled, said surface will be impressed l
with a plurality of indentations of greater or
constantly to urge the armature in one direction
relative to said coil, a switch mounted on said
arms and controlling supply of current to said
coil, said switch comprising a pair of contacts
less depth, according to the distance that the
operator holds the tip of the point from the sur
carried by a support mounted on said arms, a
yieldable mounting for at least one of said con—
face to be stippled.
From the foregoing, it will be apparent that 50 tacts tending constantly to urge it away from
the other contact, and means whereby said ar
the, present invention provides an engraving tool
mature, when urged against said stop means by
with a novel tapping unit which may be easily
said spring means, holds said yieldably mounted
fabricated and assembled, and which may be
contact engaged with the other contact, thereby
completely wired so that the line wires may be
the coil circuit, and releases said
pulled through the hollow handle A and the
yieldably mounted contact to permit it to sep
cap or cup C of the unit will thereby be pulled
arate from the other contact when the coil is
into engagement with the reduced end portion
energized and the armature thereby is moved
A’ of the handle to complete the assembly of the
against said spring means.
device and properly encase or house the tapping
I claim:
1. A tool operating reciprocating motor as
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