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Патент USA US2654299

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Oct. 6, 1953
Filed May 11, 1949
I 2 Sheets-Sheet l
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Oct. 6, 1953
Filed May .m
' 2 Sheets-Sheet 2
Patented Get. 6, 1953
Carl Frederick Ytterberg, Yonkers, N. Y., assignor
to Kalman Floor Company, Incorporated, New
York, N. Y., a corporation of New York
Application May 11, 1949, Serial No. 92,647
3 Claims.
Concrete surfacing machines of the power
actuated type have been shown to be of substan
tial value when used to impart to the surfaces of
freshly deposited concrete slabs the desired char
(01. 94-45)
which prevents any member T from contacting a
wall, post or other object when the machine is
in use. Guard ring I0 is rigidly secured to the
acteristics and such machines are being employed " outer ends of tubular members II and the inner
ends of these members are rigidly attached to the
to an increasing extent. Numerous speci?c types
central disc [2 of the frame, as by welding.
have been proposed and certain of them placed
Members H are arranged in three ‘groups of two
in actual use, including machines of the rotary
each, the groups being equally spaced apart.
type comprising one or more work engaging mem
bers and an electric motor for moving the work ' angularly, and the two members of each group
being preferably arranged in parallelism. Cen
engaging surfaces of such member or members
tral disc I2 is provided with a hub l3 having
about a vertical axis as the machine is advanced
an upwardly ?aring socket or recess to receive
the correspondingly tapered member [4, which
The present invention relates to a concrete
is operatively connected, through gearing if de
surfacing machine of the rotary type, more spe
sired, to the rotor of a motor the outer casing
ci?cally to a rotary power driven machine. hav
of which is indicated at M. The handle H is
ing a plurality of work engaging members in the
connected to the casing of motor M so that, when
nature of trowels, connected to a common frame,
the apparatus is in use the motor casing will be
the assembly of frame and trowels being rotated
about a vertical axis, when in use, by an electric
motor of substantial size. Each of the trowels
is connected to the common frame by means
which has the capacity to absorb vibrations so
that if, as preferred, the trowels are vibrated at
high frequency, such vibrations are not com
municated to the frame. It is thus possible to
mount electric motors directly upon the frame
and, in a preferred form of the invention herein
after to be described in detail a number of motors
are so supported, including a central motor of
large size for effecting the rotation of the as
sembly about a vertical axis and several sec
ondary motors, one adjacent each work engag
ing trowel. Each such secondary motor is con
nected by a belt or the like to an eccentric mem
positively held against rotation by the operator
and the motor frame and trowel assembly caused
to rotate about a vertical axis.
Each trowel T is disposed directly below a pair
of the substantially parallel rod members ‘II and
is directly connected to each such member at
two spaced points. The connecting devices are
similar. Each includes means ‘at its upper end
for gripping or clamping one of the rod members
H and means at its lower end for connecting
that end to a bracket which is in turn rigidly
secured to the trowel. One of these brackets may
clearly be seen in Figure 5, being indicated at [6.
It is disposed transversely of the trowel T upon
which it is mounted and its ends are rigidly
attached to the trowel by screw bolts [1. At its
midpoint it is provided with a recess which re
ceives a bearing I8 for rotatably supporting one
end of the eccentric member l9 which extends
lengthwise of the trowel, and intermediate this
bearing receiving recess and its outer end has
therein a cylindrical aperture 20 the axis
bodiment selected for disclosure by way of ex
of which is vertically disposed.
ber rotatably mounted upon the adjacent work
engaging trowel so that the trowel is mechanically
vibrated whenever the motor is in operation.
The assembly described is largely of novel char
acter, and likewise many of its details. The em
ample is illustrated in the accompanying draw
ings, in which,
Within the aperture 20 is ?tted a thin cylin
drical sleeve 2|, the sleeve having a transverse
?ange 22 at its upper end and being secured in
Figure 1 is a plan view of the apparatus;
Figure 2 is a side elevation;
Figure 3 is a section on line 3-3 of Figure 1; 45 position in any suitable manner. A second sleeve
23 of much smaller diameter is disposed within
Figure 4 is a section on line 4-4 of Figure 3;
2| and is coaxial with that sleeve. The
Figure 5 is a section on line 5—-5 of Figure 3;
space between the mutually facing surfaces of the
Figure 6 is a section on line 6-6 of Figure 4;
two sleeves is occupied by a cushioning or vibra
50 tion absorbing member 24, of rubber or other
Figure 7 is a section on line 'l—'! of Figure 3.
suitable resilient material, such member being
The motor frame is generally indicated at F
annular in cross section and its inner and outer
and each trowel like work engaging member at
cylindrical surfaces being vulcanized to the sur
T, the frame overlying all of the trowels and
faces of members 2| and 23 respectively. A ver
being provided with a. circular guard ring 10 55 tical bolt 26 passes through sleeve 23, through
It will be appreciated that, for certain of the
elements disclosed others may be substituted
without sacri?ce of function or result and that
there may be some rearrangement without de
parture from the invention. In every instance,
aligned apertures in the rod member H directly
above, and through apertures in the upper and
lower rod clamping members 21 and 28, respec
tively. When the bolt is tightened the bracket
l6 and rod II are ?rmly secured together but in
however, the eccentric means for effecting vibra
tion of a trowel member will be rigidly secured
such manner that any vibration of the associated
trowel will not be communicated to the rod ll
to that member, the eccentric driving-motor will
be on the motor frame, and the connecting devices
above but will the absorbed by the cushioning
member 24. Four such securing means are asso
ciated with each trowel member and serve to at
10 will include vibration absorbing parts.
Having thus described the invention, what is
claimed as new and desired to be secured by
Letters Patent is:
1. In a concrete surfacing machine, in com
tach that member at four spaced points to the two
spaced rods H directly above.
. _
Above each trowel T is a motor 30, such motor
being connected to the associated eccentric 19
bination, a plurality of work engaging trowels,
by means of a pulley 3i ?xed ‘on the end of the 15
a motor frame above the trowels, spaced brackets
eccentric, a pulley 32 connected to the rotor of
mounted upon and extending transversely of each
motor 30, through gearing if desired, and a con
such trowel, an eccentric rotatably supported in
necting belt 33. Motor 30 is mounted upon a
base 35 which is supported for rocking movement
upon one of the rods H and adjustably supported
upon the companion parallel rod. Thus base 35
is mounted for rocking movement upon the left
hand’ rod (Figure 5) and an adjusting screw 36
said spaced brackets, a driving motor centrally
mounted on the motor frame, a plurality of sec
ondary motors mounted on said motorx frame,
one adjacent each trowel, a vibration absorbing
driving connection between each bracket and the
motor frame, and a driving connection between
passing through a threaded aperture in a boss
each eccentric and the secondary motor asso
31 at the» other end of the motor base has its 25
lower end at all times in engagement with the
right hand rod H shown in Figure 5. By ro
tating the screw 36 the motor base may be tilted
and the motor bodily adjusted toward or away
from the trowel T below. The tension in each
belt 33 may be thus adjusted as desired.
. The mains for supplying the motors with elec
tric current are not shown and any convenient
wiring system may be utilized. Preferably cur
rent. will be transmitted to the motors on the
rotating frame through brushes such as lit and
H, mounted on ,the‘disc 12, which brushes are
in constant contact with rings 42 and B3, respec
tivcly, secured to the underside of an insulating
plate 45 attached to the stationary motor casing.
A protective casing 46. encloses these parts. The
rings 42 are connected to a stationary source of
electric current by wires which may conveniently
pass, alongthe handle H to its upper end, and
ciated therewith.
2. The combination set forth in claim 11 in
which the motor frame comprises a central memi
her and a plurality of arms extending outwardly
therefrom, said arms being arranged, in pairs;
one of the secondary motors bridging and bein
supported by the arms of each pair.
» w
3. The combination set forth in claim_ 1 in
which the motor frame comprises a, central'r'nem
her and a plurality of arms mounted rig-idly
thereon and extending outwardly therefrom, said
arms ‘being disposed in pairs, one of said second;v
ary motors being rockably mounted on one arm
of each pair of arms and being adjustably sup?
ported on the other arm.
‘in the file
of this patent
’ '
‘ ’ '
thence to that source, as is customary in power
operated surfacing machines of this class. The
Namea. ____ _2____V'Dec.
brushes 40 and 4!, which are urged upwardly
into contact with rings 43 and 42, respectively,
Andersen _f___;___-__' Apr. 11,1939
by springs such as the helical springs illustrated,
Mall ____ .._‘ ______ -_._ July'sa'icio
of .course, rotate with the frame upon which 50 2,332,687
Baily _____ _;_-____ __._ Oct.26, 1943
motors 30 are vmounted and each brush will be
2,342,445 » Allen ________'_-___.,.__ Feb, 22, 1944'
connected to each of the motors by a suitably
arranged. and supported wire, in the manner
thought most convenient.
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