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Patented Sept, 24, 1946 _
2,408,346
-¿ , . „
UNITED, V"S'I'ATÉS '.eÀTEiNrÍoFLFieE
Kave A. Smith, Overland, Mo., assignor to
Lincoln Engineering Company, St. Louis, M0.,
a corporation of Missouri
. y vApplication October -7, 1944,’¿Serial’No. .557,587
5 Claims. (C1. 3094-4)
l
.
This‘invention relates to -pistonaand with re
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2
|3‘wl1ich hug the inside 'of the cylinder 3. 'One
metal'head lof the piston is shown at i5 andan
other at Il. Each head I5 andv I1 carries a
sliding hub I9. The `hubs are oppositely directed
gard to certain morespeciñc'features, to follower ,
pistonsffor lubricant containers and the like, being
an improvement over the ’piston shown `in-> the
copending U. S. patent application of k'Lutwin
CpR'otter and Victor G. Klein, Serial No. 435,966,
now Patent Number 2,394,488, ‘ñled May 7, 1943.
' to 'accommodate the resilienthub I I of the pack-V
ing. Each head >I5 and Il is also provided with
`an edgewise beveled portion 2| Vfor accommodat
ing the lips I3, these beveled portions beingalso
for Lubricating apparatus. , ~
Among the several objects of the invention may
oppositely directed.
benoted "the provision of a piston which great
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The head I5 is Nprovided with preferably dia
1y simplifies assembling Yprocedure and reduces
metrically opposite holes 23v for accommodating
the cost of manufacture; and the provision of a
the straight shanks 25 of a pairof holding studs.
The >shanks >pass through said `'openings 23 and
also through aligned openings `2l' in the-packing
El.v The openings 21 are of’a size adapted to grip
and seal around the shanks 25.
piston Lof the class described which veliminates
several unhandy fasteners, whereby'replacement
in the ñeld of its packing member may readily 15
be accomplished -entirely without tools. Other
objects will be in part obvious and in 'part point
ed out hereinafter.
Each shank, beyond the diaphragm 9, >is
grooved, as shown at 29. What may be called
a head kportion 3| is preferably of the same di
»
-The invention `accordingly comprises the -ele
ments and combinations of elements, features 20 ameter as shank 21. The grooves 29 are ar
of construction, and arrangements of parts which
rangedin a plane next to ¿one face of the pack
will be exempliñed in >the structureshereinafter
ing 9, said planer being the one which the »head
described, and the scope of the >application of
|‘1 isto assume.
»
which will be indicated in the following claims.
As indicated in Figs. 1 and 3., the head l1 is
In `the accompanying drawing, in lwhichis il 25 provided with keyhole openings 33. The small
lustrated one of various possible embodiments of
ends’or notches 35 of `these openings are prefer
the invention,
.
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ably opposite and must be centered with the open
Fig. 1 is a plan view of one side of..my new
ings 23 in the opposite head I5. The enlarged
piston;
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_
portions 3l of the openings 33 are opposite but
Fig. 2 is a plany viewof the opposite side of 30 not diametrically opposite. Thus the directions
the'piston;
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of the keyholes are opposite since the left-hand
Fig. 3 is a View similar to Fig. l showing a
keyhole in Fig. 3 points counterclockwise and the
preliminary assembly .or disassembly operation;
right-hand hole 33 Vpoints clockwise. Each en
larged end 31 of each hole 33 freely-accommo
Fig. 4 is a vertical section taken on line 4-4
of Fig. 1 but showing also the cylindric lubri 35 dates a head 3|; whereas the small notched part
cant compartment of a lubricant pump, for which
35 accommodates only the grooved portion 29.
the piston is adapted; and
Assembly or disassembly is quite easily carried
Fig. 5 is an explodedv view of the piston , parts
out as is añirmed byfcomparing Fig. 3 and Fig. 1.
shown partially disassembled.
`
In Fig. 3 the studs 25 have been inserted through
Similar reference characters indicate corre 40 the'openlngs in the head I5 (see also the left
sponding parts throughout the several views of
hand part of Fig. 5). Next, the packing-is assem
the drawing.
Y
bled'by inserting the studs 25 through the open
ings 2l Vin the packing. Then as shown in Fig. 3,
the large portions 3l of the keyhole openings 33
Referring now more particularly to Figs. 1, 2
and 4, numeral | indicates my new piston assem
bled for insertion into a cylinder, the latter being
shown at numeral 3 in Fig. 4. This piston is
intended to actk as a lubricant follower, on lubri
are applied axially over the heads 3|. Then the
head |1 is slipped laterally into the position shown
in Fig. 1, wherein the small ends 35 of the notches
cant carried beneath and in the cylinder 3. To
33>are keyed into the recesses 29.
,
this end it Aslides upon a retractor rod 5 and is ~
The piston thus assembled may be applied to
biased by means of a spring "_I. Sometimes fol 50 rod 5 and inserted into the'cylinder 3 and there
lowers of this type are used'in cylinders without
after the head |'| cannot slip back into the Fig. 3
rods such as 5.
position because the rod 5 prevents any substan
The invention has to do with the piston per
tial misalignment between the head I1 and the
se. 'I‘his consists of an lintermediate resilient
packing 9 to the extent that would be required
packing diaphragm 9, consisting _preferably of
synthetic rubber or the like which is chemically
resistant to attack by lubricants, such as for
55 for disassembly.
example, “neoprene” This packing has an elon
gate hub part II which hugs the retractor rod
5. On its periphery are opposite edgewise lips 60
It will be noted that one rea
son for this fact is that the keyhole openings
33 are not pointed -in the same direction around
the clock. If they were, the head I1 could, even
in the cylinder 3, twist around to a disassembling
position.
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Y
e
2,408,346
3
It will be noted that for disassembly purposes
the lengths of the small portions 35 of the keyhole
4
passing through said openings, a second head on
the opposite side of said packing member, said
studs having grooves in the plane of said second
head and adjacent to the packing,` and keyhole
openings in the second head having notched
ing 9 which is greater than the misalignment
which will be permitted by the rod 5 or the cylin- j 1 . portions cooperating only with said grooves and
y, oppositely directed with respect to the clock, said
der 3 in which the piston I operates.
notched portions being diametrically opposite one
To disassemble the piston is quite easy for all
another, >said keyhole openings having enlarged
that needs to be done is to remove it from cylinder
vportions
accommodating the non-grooved por
3 and rod 5 and then move the head l'l `from the
tions
of
said
studs beyond the grooves, said heads
position shown in Fig. 1 to that shown in Fig. 3;
and packing being adapted to be maintained in
After this it may be removed axially as suggested
slots 33> are enough to require a degree of mis
alignment between the head .l1 and the pack
alignment by the interior wall of the cylinder in
in Fig. 5. Removal of the packing diaphragm
which said piston is used.
from the unthreaded studs 25 is then quiteeasy
3. A piston comprising an intermediate pack
15
and may be Iaccomplished without damage.
From the above it will be seen that the inven
tion avoids all threaded studs, nuts, washers and
the like, and that assembly and disassembly may
ing member, a head on one side of said member
having diametrically opposite openings, `said
packing having openings aligned therewith, studs
vpassing through said openings, a second head
tools. It also simpliñes assembly and disassem 20 on the opposite side of said packing member, said
studs having grooves in the plane of saidv second
bly and reduces the cost of manufacture. It will
head adjacent to the packing, and keyhole open
be noted that a part of the reason for the simpli
ings in the second head having notched portions
fication accomplished is the use of the rod 5 (on
cooperating with said grooves and oppositely di
which the piston operates) for preventing work
rected with respect to a radius of the piston,
ing loose of the head l'i. In other words, the
readily be accomplished entirely by hand, without
said keyhole openings having enlarged portions
head I1 needs to pass through a sequence of posi
- accommodating the non-grooved portions of said
tions for disassembly which the rod 5 will not
studs beyond the grooves, the length of said
permit when the piston is thereon. It Will be
notched portions of the keyhole openings being
understood that in cases where the follower is
used in a cylinder without a rod such as 5, the 30 such as to require for disassembly a misalign
ment between the head in which they are lo
heads I5 and I1 are made without central open
cated and the packing member which is greater
ings and that in such cases it is the cylinder
than that which ris permitted by the cylindric
such as 3 which prevents the head I1 from pass
member in connection with which the piston co
ing through a sequence of positions which would
cause its disassembly in the cylinder. Broadly 35 operates.
4. A piston- comprising an intermediate pack
considered, either cylinder 3 and/or rod 5 may be
ing member, a head on one side of said _member
considered to be a cooperating cylindric member
having an opening, said packing having an open
in connection with which the piston operates,
ing aligned therewith, a stud passing through
40 said opening, a second head on the opposite side
conditions.
of said `packing member, said stud having a‘
While a single keyhole slot andY one stud could
be used, two or more with a symmetrical rela
groove in the plane of said second head adjacent
tionship between the stud positions is preferable
to the packing, and a keyhole opening in the
for a balanced holding action by the studs.
second head having a notched portion cooperat
In View of the above, it will be seen that the
ing only with said groove, said keyhole opening
several objects of the invention are achieved and
having an enlarged portion accommodatingthe
other advantageous results attained.
I
groove of said stud, the length of said notched
As many changes could be made in the above
portion of the keyhole opening being such as _to
constructions without departing from the scope
require for disassembly a-misalignment between
of the invention, it is intended that all matter
the head in which it is located and the packing
contained in the above description or shown in
member which is greater than that which is
the accompanying drawing shall be interpreted as
permitted by the cylindric member in connec
whereby is prevented disassembly under Working
illustrative and not in a limiting sense.
I claim:
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tion with’which the piston cooperates.
i
1. A piston comprising an intermediate packing
member, a head on one side of said member hav
ing openings, said packing having ropenings
aligned therewith, studs passing through said
openings, a second head on the opposite side of
said packing member, said studs having recesses
in the plane of said second head and adjacent
to the packing, and keyhole openings in the
,5. A piston comprising an intermediate pack
55 ing member and a pair of heads between which
the packing member is disposed, a post project
ing from one head through an ope-ning in said
packing member, and through a keyhole open
ing in the other head, said keyhole opening be
ing formed to provide an aperture larger than
saidpost and a smaller notched> portion extend
ing therefrom, said post having a groove in the
second head having notched portions cooperat
plane of said other head adjacent the packing
ing only with said recesses respectively and be
ing oppositely directed with respect to the clock, 65 member, said notched portion cooperating with
said groove to prevent axial lseparation ofV the
said keyhole openings having enlarged portions
heads and packing member and being- ofv such
accommodating the non-grooved portions of said
length and extending from said aperture in such
studs beyond the grooves, said heads and pack
direction as to prevent both relative rotation and
ing being adapted to be maintained in alignment
by the interior wall ofl the cylinder in which said 70 separation of said other head when the heads
and packing member are maintained in align
piston is used.
ment
by the cylindric member in connection with
2. A piston comprising an intermediate pack
ing member, a head on one side of said member
having diametrically opposite openings, said
packing having openings aligned therewith,_studs
which the piston is used.
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KAVE A. SMITH.
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