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Патент USA US2127169

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Aug. 16, 1938.
A. W. GRAY
2,127,169 '
PISTON EXPANDER
Filed July 1, 1936
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1938.
A. w. GRAY
2,127,169
PISTON EXPANDER
Filed July 1, 193a
2 Sheets-Sheet 2
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Attorneys _
2,127,169
Patented Aug. 16, 1938
UNITED STATES
2,127,169
PISTON EXPANDER
Arthur W. Gray, Ellensburg, Wash.
Application July 1, 1936, Serial No. 88,490
3 Claims. (Cl. 78-101)
This invention is a device to facilitate the
expanding of a piston. The general practice at
the present time is to expand or enlarge a piston
by striking the same with a hammer, but this
i manner of so expanding a piston has proved un
satisfactory for the reason that it is impossible
to obtain a uniform expansion of the piston due
to the fact that on account of the length of the
depending lug l5 that extends down into the
channel 8 as shown in Figure 4. At its respective
opposite ends the anvil i4 is provided with open“
ings 16 for the accommodation of rivets or other
suitable fastening means whereby said ends of 5
the anvil are secured to the plate or ?ange ex
tension 9.
skirt it is practically impossible to place the
0‘ hammer inwardly of the piston as far as the
head thereof as is necessary to obtain a uniform
expansion of the piston.
In accordance with the present invention an
electrically operated hammer is provided and
ing oppositely threaded end portions l8 which
are threadedly engaged in the threaded apertures
will be found particularly adapted for use in ex
of lugs 19 that extend into the channel 8 and
are formed integral with or otherwise secured
to the plates Ml as shown in Figure 4. Obvious- 15~
1y by turning the screw I1 plates III are moved
panding pistons, together with e?icient means
for supporting the pistons in operative position
toward or away from one another and relative to
the anvil M as found desirable. By a proper ad
to the hammer.
justment of the plates I!) the piston to be ex
panded is properly centered over the anvil I4.
The invention together with its objects. and
advantages will be best understood from a study
of the following description taken in connection
with the accompanying drawings wherein:
Figure 1 is a top plan View of the device.
Figures 2 and 4 are sectional views taken sub
stantially on the lines 2--2 and 4-4 respectively
of Figure 1.
Figure 3 is a side elevational view of the device.
Figure 5 is a perspective View of an anvil.
Figure 6 is a wiring diagram.
30
For adjusting the plates 10 relative to one an
other and to the anvil Hi there is accommodated
within the channel 8 an adjusting screw ll’ hav- 10
’
Referring to the drawings by reference numer
als it will be seen that in the preferred embodi
ment thereof the device comprises a base block
5 having a raised portion 6 that extends for sub
stantially one-half the length of the block to
35 one end of the latter.
Provided in the raised portion 6 of the block
is a transverse groove 1 in which ?ts a channel
8 the side walls of which are provided with op
positely extending lateral ?ange or plate exten
4O sions 9 that rest on the raised portion 6 at oppo
20/
Suitably secured to the stem end of the block
5 adjacent the raised portion 6 is a plate 20 on
which are mounted a pair of magnets 2|, 22
that are wired together as at 23. One of the mag
nets is connected through the medium of a wire 25
24 with a terminal post 25 suitably provided on
the block 5 and which post is in turn suitably
connected with one side of a source of electrical
energy as, for example, a battery or the like (not
shown).
30
Rising from the plate 20 is a standard 26 pro
vided at its upper edge with a ?ange 21 that is
supported from the block 5 through the medium
of suitable bolt and nut means 28.
The ?ange 21 is connected with the standard 35
26 through the medium of an off-set portion 29
to which is bolted or otherwise secured as at 30
the ?anges of a bracket plate 31. Bolted to the
plate 3| as at 32 is an arm 33 of-conductive mate
rial and this arm is provided with a contact 34. 40
Also bolted to the ?ange 21 as at 35 is an angu
site sides of the slot 1.
lar spring arm 36 provided with a contact 31
nel 8 are slides I 0 which are provided at their
complemental to the contact 34.
As clearly shown in the wiring diagram of
Disposed transversely of the plates 9 and chan
respective .opposite end edges with inturned
45 ?ange portions l I that engage the adjacent edges
of the plate or ?ange extensions 9 for slidably
retaining the slides ID in position for adjustment
toward or away from one another.
Formed integral with the plate extensions ID
5 O are ribs l2 that have inclined portions 13 to en—
gage the periphery of the skirt of the piston rest
ing on the plate [0.
Disposed transversely of the channel 8 at
about the longitudinal median of the block 6 is
55 an anvil l4 that is provided with an apertured
Figure 6 the magnet 22 is connected in circuit 45
with the contact 31 through the medium of a
wire 38 while the contact 34 is wired in the cir
cuit through the medium of a wire 39 that is
connected to a second terminal post Ml which
in turn is connected to the opposite side of the
battery or other suitable source of electrical sup
ply.
A hammer is provided and includes a shank M
which at one end is bolted or otherwise secured
as at 42 to an intermediate portion of the spring 55
2
2,127,169
arm 36.
At its opposite or free end the shank
4| of the hammer is provided with a head 43
that is disposed over the anvil M for striking the
skirt of the piston.
Adjacent its bolted end the shank 4| of the
hammer has suitably secured thereto an arma
ture plate 44 disposed in operative position to the
magnets 2| to be attracted thereby when the
magnets are energized to cause the hammer 4|
to move downwardly for striking the head 43
thereof against the skirt of the piston with suf?
cient force to obtain the results desired.
In connection with the above it will be noted
that the resilient arm 36 is normally ?exed up
15 wardly to engage contact 37 with contact 34.
With the contacts thus engaged the circuit will
be completed through the magnets 2| and 22.
Upon energization of said magnets armature 44
will be attracted thereby to cause the hammer
4| to move downwardly into forcible contact with
the skirt of the piston supported on the plates
I0.
Obviously as the armature 44 moves down
wardly under in?uence of the magnets 2|, 22
resilient arm 36 will be ?exed downwardly for
,;moving the contact 31 out of engagement with
the contact 34 thus interrupting the circuit
through the magnets. When the circuit is thus
interrupted spring arm 32 will ?ex upwardly to
again re-engage contacts 3'! and 34. Thus by
30 -:a constant repetitionlof this cycle of
operation
hammer 4| is caused to have a vibratory action
for imparting a series of blows to the skirt of
the piston as found desirable in expanding the
piston so that the same will'have a proper ?t
when placed within its power cylinder.
It is thought that a clear understanding of
the construction, utility and advantages of an
invention of this- character will'be had without
a more detailed description.
Having. thus described the invention what is
claimed as new is:—
1. In a machine for reshaping pistons, a base
plate having at its center a channel-shaped por
tion, an anvil superimposed on said base plate
and having a lug depending in the channel, an
adjusting screw disposed in said channel and
swivelly mounted for rotation on said lug, a pair
of adapter units superimposed and slidably
mounted on said base plate, said unit bridging
the channel and having portions depending into
said channel and operatively joined to the ad
justing screw to facilitate movement toward and
from the anvil to accommodate piston heads of
varying diameters.
2. In a machine for reshaping pistons, a base
plate having at its center a channel-shaped por
tion, an anvil superimposed on said base plate
and having a lug depending in the channel, an
adjusting screw disposed in said channel and
swivelly mounted for rotation on said lug, a pair
of adapter units superimposed and slidably
mounted on said base plate, said adapter units
being provided with inclined portions elevated
above said base plate and converging toward each
other to serve as conforming rests for the shell
of said piston head.
I
3. In a machine for reshaping pistons, a base
25
plate, upstanding portions on said base forming
a transversely extending. channel, an anvil hav
ing a ?at working surface on said base plate, a
lug on said-anvil extending intosaid channel, an 30
adjusting screw disposed in said. channel and
mounted for rotation in saidxlug, ap-air of holder
units on opposite sides ofsaid. anvil, said. units
being threadedly connected to said adjusting
screw for movement towards and away from said
anvil, andsaid units being provided with diverg
ing portions elevated above said anvil whereby
different sized pistons may be held on said anvil
to subject the piston to azhammering action to
reshape the same.
.
ARTHUR W. GRAY.
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