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Патент USA US3061288

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Oct. 30, 1962
H. DREYER
3,061,278
VIBRATOR TOOL
Filed May 25, 1959
2 Sheets-Sheet 1
„ESC
17
INVENTOR.
Oct. 30, 1962
H. DREYER
3,061,278
VIBRATOR TOOL
Filed May 25, 1959
2 Sheets-Sheet 2
5.
jI‘ZZ/
'
121°/
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352
„171298597“ „ÜQEyE-ë,
JNVENTOR.
»frire/velg. .
United States Patent Ofiîce
‘
3,061,278
Patented Oct. 30, 1962
1
2
3,061,273
taining a fluid tight seal between these body parts. For
optimum operating results, it is desirable that one of the
body sections contain an electric motor, acting to drive
the rotating unit relative to that section. The sealing of
VIBRATOR TGÜL
Herbert Dreyer, 2137 Paseo Del Mar,
Palos Verdes Estates, Calif.
Filed May 25, 1959, Ser. No. 815,576
8 Claims. (Cl. 259---1)
This invention relates to improved vibrator type de
the body structure then of course is such as to very
effectively seal the motor against contact of any of its
moving parts with the work material.
The above and other features and objects of the pres
ent invention will be better understood from the follow
vices for use in vibrating or agitating a mass of material,
such as a body of wet cement which is to be compacted 10 ing detailed description of the typical embodiment illus
to an increased density condition by the vibration in
trated in the accompanying drawing in which:
order to increase the strength which the cement has after
FIG. l is a lfragmentary vertical Section through a
hardening. For packing cement solidly within a for-m,
there have in the past been devised various types of
vibrator devices, which are. lowered into the wet cement
and act to vibrate the cement in a manner causing it to
Settle down to a compacted condition. These Vibrators
normally include a weight contained within a closed hous
cement form, showing a vibrator type tool constructed in
accordance with the invention and positioned within the
cement in theform;
FIG. 2 is an enlarged vertical section through the
FIG. l tool;
FIGS. 3 and 4 are fragmentary vertical sections show
ing, and mounted to rotate rapidly but eccentrically With
in the housing, to give the housing a ‘rapid vibrational
ing two variational forms of the invention;
movement in the cement.
variational form;
Though such vibration of the
cement has proven very effective for packing it tightly
in a form, devices of this type have had certain opera.
tional disadvantages, as a result of which they have re
FIG. 5 is a view similar to FIG. 2 showing another
FIG. 6 is an enlarged fragmentary section taken on
line 6-6 of FIG'. 5; and
FIG. 7 is a section through stillanother form of the
quired very frequent repairs in use, particularly because 25 invention.
’
of the bearing difficulties resulting from the rotation of
Referring
first
to
FIGS.
l
and
2,
i
and
particularly
the heavy eccentrically mounted weight within the hous
FIG. 1, I have represented at 10 a cement or concrete
ing of the device.
form, which may typically be consideredto be the lform
The general object of the present invention is to pro
vide an improved vibrator type device which is capable 30 -for a wall of a reinforced concrete building. The form
10 is normally made up of a series of boards 11 suitably
of serving this cement packing function, as well as other
secured together to give the ultimate wall any desired
vibrator functions if desired, and which is structurally
configuration. The cement or concrete 12 is poured into
much simpler than the above discussed' conventional type
the
form 10 in wet uncured condition, to assume the
of Vibrator. Particularly contemplated is a device of this
shape of the form 10.
type which is adapted for reliable operation over very
The vibrator device of the present invention is shown
long periods of time without the necessity for the usual
at 13 in the figures, and is adapted to be immersed com
frequent repair and replacement of parts. A device em
pletely within the body of wet cement 12, to vibrate
bodying the invention desirably includes two body parts
that cement in a manner causing it to pack or settle
which are submersible as a unit within a body of cement
or other material, and one of which parts is free forI 40 downwardly very compactly within form 10. Vibrator
13 is suspended within the cement 'by means of a flexible
rapid essentially vibrational movement relative to the
sealed and insulated electrically conductive line 14
other to agitate the material. Such relative movement of
through which energizing current is vfed downwardly to
the two body sections is produced in a very unique man
unit
13. Suspending line 14 may be connected at its
ner by provision of a rotating unit, which is power driven
upper end to a control switch 15 which is held in the hand
to turn about a predetermined axis relative to one of the
of an operator, and by which the operator opens and
body sections, and which has a portion journalled -for
closes the electrical circuit to unit 13. Current may be
rotation relative to the other body section about a second
fed
to switch 1S through a line 16 having a conventional
and slightly different axis. In one form of the invention
plug 17 at its end. The power utilized by the apparatus
the two axes are disposed at a slight 4angle to one another,
is preferably 110 volt, either A.C. or D.C., the motor"
while in another form the two axes are parallel but 50 within
the unit 13 typically being a universal type motor
slightly offset from one another. Preferably, the rotat
(operable on either A.C. or D.C.).
ing Vunit takes the form of a shaft structure having one
Vibrator unit l13 includes an upper hollow body sec
of its ends journalled in a first of the body sections for
tion ,18 and a relatively movable lower hollow-body sec
rotation about a first of the axes, and having its other
end journalled within the second body section for rota 55 tion 19. Upper section 18 contains an electric motor
20, whose shaft 21 projects downwardly into the lower
tion relative thereto about the second axis. This rela
body section 19 to actuate it. The electrically conduc
tive suspending line 14 is connected into the upper end
of upper body section ‘18, and may include two parallel
flexible insulated wires 22 contained within a flexible
or offset of the two axes.
60 fluid tight hose or outer sheath 23, typically formed of
The entire device is desirably hermetically sealed, so
tionship causes the second body section to oscillate
slightly with respect to the first body section as the ro
tating unit turns, and as a result of the slight angularity
that it can be completely immersed within the cement or
other Work material without any of that material having
rubber or the like. The outer hose 23 may have an en
largement 24 -at its lower end, which is securely anchored
In order to provide
within a counter-bore Z6 in part ‘18 by means of a threaded
seal ring or element disposed about the shaft or rotating
unit. _This flexible part may be lformed of rubber or
vent the entry of any cement into the interior of hose 23
access to the interior of the device.
for such sealing between the two body sections, there 65 retaining ring 25. This ring 25 is tightened to -a condi
tion in which it forms an effective annular fluid tight seal
may be positioned between these two sections, and de~
between part ,18 and enlargement 24 of the hose, to pre~
sirably bonded toboth of the sections, an annular fiexible
or body part 18 at the point of interconnection of these
parts.
Both of the body parts '18 and 19 are formed of a
in accordance -with the relative displacement of the two 70
rigid material, typically a suitable steel or other metal.
body sections, while at the same time continuously main
other elastomeric material, and is capable of flexing freely
These two parts may be both internally and externally
3,061,278
cylindrical, and of a common diameter so that the lower
section forms essentially a continuation of the upper
section. As previously mentioned, motor 20 is desirably
a universal type motor, operable on 110 volt A.C. or
D.C. power. This motor is represented in the figures as
having an outer tubular metal housing 122, to the inner
surface of which there is mounted a conventional stator
structure 123 within which rotor 1-2'4 is rotatably con
tained. At its opposite ends, motor housing 122 carries
two ball bearing assemblies 125 and 126, which rotatably
journal the shaft 21 and carried rotor structure 124 of
the motor for rotation about a vertical axis 27. As will
be understood, shaft 21 extends entirely through the rotor
structure, and carries a commutator 28 coacting with
spring pressed brushes 29 for conducting energizing cur
/l
very tight and strong bond between the rubber and metal.
The resilience of ring 48 normally tends to return that
ring to a condition in which the cross-section of the ring
(as seen for example in the plane of FIG. 2) is of uni
form size and shape along the entire annular extent of the
ring. ’This normal cross-section of the ring is of a verti
cal thickness which is half-way between the two thick
nesses shown at opposite sides of FIG. 2. When the ap
paratus is assembled, the angularity of the lower portion
of shaft `21 to its upper portion causes the ring to be
deformed to the FIG. 2 condition. As will be under
stood, the upper surface of ring 40 extends directly trans
versely of axis ‘35, and the lower surface of ring 31 ex
tends directly transversely of axis 27.
To now describe the manner of use of the illustrated
externally cylindrical, and of a size corresponding to the
device 13, assume first that cement 12 has been poured
into form 11 »of FlG. l, and that plug 1'7 has been con
internal diameter of upper body section 18 at 30, so that
nected to a suitable source of 110 volt A.C. or D.C. pow
rent to the rotor windings. Housing 122 of the motor is
er. The operator may then iactuate switch 15 to ener
the entire motor may be slipped upwardly into body sec
tion 13 during assembly of the apparatus. The motor 20 gize motor 20, and then lower tool 13 into the cement
or concrete 12 by manipulation of flexible conductive
is retained in this position within body section 13 by
line 14. The energization of motor 20 causes shaft 21
means of a lower ring 311, which is threadedly connected
to turn rapidly about axis 27 relative to upper body sec
into section 18 at 32, and which is annularly sealed with
tion 18. Since the lower portion of shaft 21 (beneath
respect thereto by an elastomeric or other seal ring rep
bend location 34) is disposed about an `axis 35 extend
resented at 33.
ing `»at a slight `angle to main axis 27, this lower portion
:In order to produce a vibrational movement of lower
of the shaft swings bodily about :axis 27, :and causes
body section 19 relative to upper body section 18 in
lower «body `section 19 to correspondingly swing about
response to rotation of the motor shaft 21 and rotor 124,
»axis 27, to produce an essentially vibrational type of
the shaft 21 is bent at a location 34, so that the lower
portion of the shaft extends at a slight angle with respect 30 movement having an amplitude represented by the angle
b in FIG. 2. This vibrational movement of lower body
to the upper portion. More particularly, the upper por
section 19 relative to upper body section 18 causes a
tion of shaft 21 above point 34 is centered and turns
rapid vibrational movement of the cement or concrete,
about the previously mentioned main vertical axis 27
to pack the cement or concrete down `very tightly with
of the motor. The lower portion of shaft 21, beneath
in form 10 so that the ultimate product will be of maxi
point 34, is centered and turns about a second axis 35,
mum density and strength. For optimum results, the
which is disposed at an angle a to main axis 27, and which
motor 20 should be a very high speed type of motor,
intersects that main axis at the point 34. This lower
typically turning at a speed of about 10,000 r.p.m. or
portion of the shaft is rotatably journalled within body
greater. As the two body sections lmove relative to one
section 19 for relative rotation about axis 35 by means
of two axially spaced ball bearing assemblies 36 and 37, 40 another, the elastomeric ring 48 of course ilexes con
tinuously in ‘accordance with the relative movement of
which are close fits within the inner cylindrical bore 3S
of body section 19, and are spaced apart axially by a
the two body parts. As seen in FIG. 2, it is desirable
that the point of bend 34 of the Shaft be located directly
spacer tube 39 interposed between the outer races of
bearings B6 and 37. The bearings 36 and 37 and spacer
radially inwardly of, or within, the flexible ring 48.
39 are retained in ñxed positions within body part 19 by
It is contemplated that the angle a of deviation be
means of a retaining ring 40, screwed into part 19 at
tween the two `axes 27 and 35 will in most instances be
41, and sealed with respect thereto by an annular elas
not more than about 5 degrees.
tomeric seal ring 43. This ring 40 tightens the lower
The variational form of the invention shown in FIG.
most bearing 37 downwardly against a transverse shoul
3 may be considered to be identical with that of FIGS.
der 44, with the lower end of body part 19 being closed
l and 2 except for the addition of a plurality of circular
beneath bearing 37 by an externally rounded nose portion
ly spaced rigid bolts 60 for transmitting rotation from
45 of part `19. To facilitate assembly of the apparatus,
upper body section 18a to lower body section 19a (cor
and particularly to enable application of the various ball
responding to sections 18 and 19 of FIGS. 1 and 2).
bearings to shaft 21, this shaft may decrease in diameter
Each of the bolts is rigid and extends through openings
at the locations 46 and 47 just beneath bearings 126 and
611 `and 62 in inner `flange portions 162 of rings 31a and
36 respectively, as shown. Also, the inner r-aces of the 55 40a, which openings are sufficiently wider than the bolt
various ball bearings l125, 1‘26, 36, and 37 may all be
in «a direction extending radially of axes 27a and 35a to
relatively tight pressed ñts on the associated portions of
avoid interference by the bolts with the vibrational move
shaft 21, and the outer races of bearings 125 and 126
ment of part 19a relative to part 18a. Beneath the bolt
may be tight pressed ñts within motor housing 122, so
heads 63 land nuts 64 there rare confined four rubber rings
that the ball bearings will all function as thrust bearings 60 65, which `are capable of sufficient resilient deformation,
as well as radial bearings, to maintain each of the body
sections l18 and 19 in a fixed -axial position relative to the
shaft.
An 4annular ñuid tight seal is formed between rings 31
and» 40, and about shaft 21, by means of a flexible seal
element 48, typically formed of a suitable resiliently de
formable elastomeric material, such as rubber. This seal
ring 48 is desirably annularly vulcanized or otherwise tight
ly bonded in fluid tight relation to both `of the rings 31
as the motor turns, to allow for the relative movement
of the body parts. As will be understood, the bolts are
tight enough fits within apertures 62 to effectively trans
mit rotary movement lbetween parts 18a and 19a, to
thereby avoid the imposition of excessive rotary forces
on ring 48a.
The form of the invention shown in FIG. 4 is the
same 'as that shown in FIG. 2, except for the addition
of a counterweight 121b which is rigidly carried by shaft
and 40, along the upper and lower surfaces 49 and 50 70 2lb yat a location just above the point of intersection 34b
of ring 48. To enhance the bond at these points, the
of the two faxes 27b and 35h. This weight 121b is off
engaged surfaces of the rigid preferably metal rings 3.1
set eccentrically with respect to main axis 27b, and in a
and 40 may be roughened or irregularized along their
direction which is exactly the opposite of the direction in
entire annular extent, with the rubber of ring 48 then
which
35b is offset with respect to main ‘axis 27b.
being vulcanized to these roughened surfaces, to form a 75 That is, if the :axis 35b is offset directly to the left of
5
3,061,278
main axis 27h, as viewed in PIG. 4, thenfthe center of
gravity of counterweight projection or lug 121b should
be olfset directly to the right of main iaxis 2.7b. The
purpose of counterweight 1Z1b is to counter balance the
eccentric weight of the lower portion of shaft 2lb (be
neath point 34b), as well as the eccentric weight of
lower body section 19‘b and the associated part, to there
by minimize or eliminate Iany tendency -for upper body
section 18b to vibrate when the device is -in operation.
In order to attain this purpose, the weight 121i), in the
optimum arrangement, is sized to substantially exactly
counter balance the eccentricity'of the lower portion of
the shaft, body section 19b, and other Iassociated eccen~
trically mounted parts.
FIGS. 5 and 6 show another form of the invention,
6
I claim:
1. A tool adapted to be lowered into and vibrate
a body of material, comprising a lirst and upper hollow
body section and a second body section therebeneath and
free for limited movement relative thereto, an electric
motor in said iirst section having a driven shaft journalled
for rotation about a predetermined first essentially vertical
axis relative to said íirst body section, means forming
an extension of said shaft rigidly carried by the shaft
for bodily rotation therewith about said lirst axis and
projecting downwardly into said second body section but
disposed at a slight angle relative to said first axis, means
journalling said shaft extension in said second body sec
tion for rotation relative thereto about a second axis dis
posed at said slight angle relative to said first axis so that
which may be considered to be the same as that of
said bodily rotation of said second portion about the
FIGS. l and 2 except in the following respects. In the
ñrst axis causes the second axis and thereby said second
ñrst place, the two «axes 27¢` and 35C of the upper and
body section to swing about the iirst axis to thereby
lower portions of shaft 21C, instead of being disposed Iat
vibrate
said material, and a flexible connection between
an angle to one another, are disposed parallel to one an
said two body sections retaining the second section against
other but a-re `offset slightly as represented at d. The up 20
rotation with the shaft relative to the ûrst section.
per portion of shaft 21C, above point 34C, is journalled
2. A tool as recited in claim l, in which said flexible
for powered rotation relative to the upper body section
connection
includes an annular elastomeric member inter
18C Iabout the upper axis 27C. The lower externally cy
axially between and bonded to and forming a fluid
lindrical portion of shaft 21C` (beneath point 34e) is 25 posed
seal between said two body sections at a location about
journalled for rotation within and relative to lower body
the
location at which the shaft extends between said
section 19e about the axis 35e. These two upper and
two body sections.
lower portions of shaft 21C are integral with one another
3. A tool as recited in claim 2, including a flexible elec- i
and therefore rigidly interconnected for rotation together.
trically
conductive line connected to said iirst body sec
Consequently, as the upper motor structure 20c drives 30
tion for suspending the sections in said material, said body
the shaft about axis 27e relative to body section 18C,
sections and said line being hermetically sealed against
the eccentricity of the lower portion of the shaft Will
the entrance of any of said material thereinto when the
cause that portion to swing about axis 27e, and thereby
body sections are completely immersed in said material.
cause bodily rotary movement of lower body section 19C,
4. A tool as recited in claim 1, including a weight
this rotary movement having the effect of a limited range 35
carried by said shaft eccentrically with respect to said
vibrational type of movement, which will compact and
iirst axis and at a location to at least partially counter
settle cement or other material into which the device is
balance the weight of said shaft extension.
lowered. As in the other forms of the invention, the
5. A tool adapted to be lowered into and vibrate a
upper and lower body sections are resiliently intercon
body
of material, comprising a first and upper hollow
nected by an elastomeric seal ring 48e, which allows only 40 body section
and a second body section therebeneath and
very limited vibratory type movement of lower body sec
free for limited movement relative thereto, an electric
tion 19C relative to upper body section 18e. It is noted
motor in said first section having a driven shaft journalled
also that, in FIG. 5, the upper body section 18C may be
for
rotation relative to said first body section about a pre
of an external diameter which is suñîciently greater than
determined lirst essentially vertical axis, means forming
the external diameter of lower body section 19C to pre
an extension of said shaft rigidly carried by the shaft
vent the periphery of lower body section 19c from ever
for
bodily rotation therewith about said first axis and
projecting laterally beyond the periphery of upper body
projecting downwardly into saidsecond body section and
section 18C. That is, if the cylinder deñned by the out
centered about a second axis which is parallel to but
er surface of upper body section 18e` were continued
downwardly, as represented »at 118C, -then the outer sur 50 offset slightly from said first axis, means journalling said
shaft extension in said second body section for rotation
face of lower tbody section 19C should in all positions
relative thereto about said second axis so that said bodily
be contained entirely within that extended cylinder 118e.
rotation of said extension about the first axis causes the
The purpose of this is to avoid any possibility of lower
second
axis and thereby said second body section to swing
section 19t,` ever projecting to «a position in which it might
catch ion any reinforcing metal element or other part or 55 about the ñrst axis to thereby vibrate said material, and
a flexible connection between said two body sections re
shoulder formed in the body of cement, in a manner
taining the second section against rotation with the shaft
such that this engagement might interfere with effective
relative to the íirst section.
upward withdrawal of the device 13e from within the
6. A tool adapted to be lowered into and vibrate a body
body of cement.
FIG. 7 represents fragmentarily another variational 60 of material, comprising a first body section and a second
body section free for limited movement relative to the
form of the invention, which may be considered to be
first section, a power driven rotating structure having a
the same as that of FIGS. 5 and 6, except that a counter
first portion rotatably carried by said iirst body section for
balancing weight 121d is formed on and rigid-ly carried
rotation relative thereto about aA predetermined first axis,
by shaft 21d at a location just above the point of juncture
34d of the two upper and lower relatively offset portions 65 said rotating structure having a second portion connected
to said ñrst portion for bodily rotation therewith about
of the shaft. This counterweight 121d is offset laterally
said íirst axis, and means rotatably mounting said second
from main axis 27d of the device in a direction which
portion of the rotating structure to said second body sec
is just the opposite of the direction in which lower axis
tion for rotation relative thereto about a predetermined
35d is offset, and the counterweight has a mass which is
just suliîcient to properly counter balance the eccentricity 70 second axis, said second axis being slightly different than
said ñrst axis so that by reason of said difference in the
of the lower portion of the shaft, as well as lower body
two axes said bodily rotation of said second portion about
section 19d and the carried bearings and other parts.
the first axis causes said second axis and thereby said
The counterweight 121d then functions to prevent or
second
body section to swing about the iirst axis to
minimize vibrational or rotational movement of upper
vibrate said material, said rotating structure including
body section 18d when the device is in operation.
75 a connection attaching said two portions thereof together
3,061,278
7
in a relation maintaining said two axes slightly diiîerent
and retaining said two portions, both when said structure
is stationary and when it is turning, against relative shift
ing movement to positions bringing the two axes into
coincidence, said rotating structure being a shaft structure
in which -said two portions form essentially two shafts
rigidly connected together and journalled in said two
body sections respectively for rotation about said two
axes respectively.
7. A tool as in claim 6 wherein said second axis is 10
disposed at a slight angle to said ñrst axis and wherein
said connection maintains said axes at said slight angle,
both when said structure is Stationary and when it is
turning.
8. A tool as in claim 6 wherein said second axis is
parallel to but slightly offset from said ñrst axis and
wherein said connection maintains said axes in said
parallel and offset relationship, both when said struc
ture is stationary and when it is turning.
References Cited in the ñle of this patent
UNITED STATES PATENTS
2,116,708
2,945,970
Niekamp ____________ .__ May l0, 1938
Nordegren ____________ __ July 19, 1960
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