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Патент USA US2108470

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Feb. 15, 1938.
2,108,470
H. s. BOULTON
FLOOR TRQWELING MACHINE
Filed Dec. 28, 1936
2 Sheets-Sheet l
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Feb. 15, 1938.
H. s. BOULTON
2,108,470
FLOOR TROWELING MACHINE
Filed Dec‘ 28, 1936
2 Sheets-Sheet 2
Patented Feb. 15, 1938 _
2,100,470 .
UNITED STATES
\
PATENT OFFICE
2,108,470
FLOOR TROWELING MACHINE
Harold S. Boulton, Chicago, Ill.
Application December 28, 1936, Serial No. 117,843
10 Claims. (0]. 94-45)
My invention relates to trowellng machines and serve to support the plates in their spaced rela
5
particularly to an improvement on the construc
tion. The outer studs on each plate project up
tion shown in my copending application, Serial
No. 29,901, filed July 5, 1935, Patent No. 2,065,560.
wardly beyond their motion-limiting nuts 25 and
An object of my invention is to‘provide means
for effecting a reciprocating movement of the
troweling plate or plates as distinguished from a
rotary movement such as disclosed in my co
pending application
heretofore
referred
to.
l0 While such movement has been considered to be
desirable, its accomplishment has been found to
The operation is as follows:
With the rotation of the motor, the cam plate 10
28-will serve to reciprocate the trowel plates or
shoes, the different positions being shown in Fig.
increase in weight and cost of the necessary ap
3, assuming a cam groove of the form shown; that is, one in which one reciprocation is brought about
for each revolution of the motor shaft. The driv- 15
ing force of the cam plate will tend to rotate the
about the desired movement by the use of mecha
nism of extreme simplicity and relatively light
weight.
-
entire frame on its thrust-bearing and thus there
‘
Collateral to the desired reciprocating move
ment, I provide ‘for a simultaneous rotating
movement, thus simulating with substantial ex
actness the hand troweling movement of an ex
perienced operator. The rotative movement also
has another advantage that will be discussed
hereinafter.
_
‘
I
The invention will be more readily understood
by reference to the accompanying drawings; in
which,
Fig. l is~a side elevation of a troweling machine
constructed in accordance with my invention;
Fig. 2 is an enlargedtransverse vertical 580
tional view;
,
‘
.
Fig. 3 is a sectional view on the line 3-3 of
Fig. 2;
-
Fig. 4 is a sectional view on the line 6-4 of
Fig. 2.;
. .
Fig. 5 is a sectional view through a modi?ed
form. of troweling apparatus and;
\ '
Fig. 6 is a sectional view on the line
Fig. 5.
40
A lug 30 and a latch 3| provide for locking the
frame and its associated parts against rotation.
be di?lcult, due to complications of design and
paratus. An object of my invention is to bring
35
terminate in rollers 26 that engage in the cam
groove 21 in a cam plate 28 that is pinned to the 5
motor drive shaft 29.
.
6-0 of
'
In the drawings I have illustrated a motor and
frame it] having an operating handle l I.- To the
will be combined rotary and reciprocating move
ment of the trowels. If the rotation is not de
sired, the latch 34 may be dropped and the parts 20
will operate merely by reciprocation. This rotary
motion has an advantage in that it will prevent
the piling up or accumulation of cement between
the edges of the trowel plates and will simulate the
motion of a workman in troweling. It will be 25
understood, of course, that in addition to the
‘reciprocating and rotary movement, the entire
machine will be propelled forward by the work-7
man, thus adding a third movement to the plates.
In the construction shown in Figs. 5 and ‘6' the 30
motor frame remains the same and this is like
wise true of the troweler frame, the latter con
sisting of an inner ring 32, arms 33, outer ring
34 and cross pieces 35, 36, 31 and 38 and outer
ring 39. The cross piece 35 is provided with a slot 35
M) parallel to the long axis‘ of the cross piece.
The arm 31 is provided with a slotil that is ec
centric to the long axis of the piece while the arms
35, 38 have slots 42, 43 that’are also eccentric,
but slightly less than the slot 4|. A single trowel 40
hub l2 of the motor frame is connected, through
plate 44 is provided with‘four upstanding studs
45, it, 01 and 48 that extend through the slots
a thrust-bearing 03, a frame comprising an inner
ring “I, arms 55 and an outer ring it. A hori
00, ill, 42, 43 respectively, springs Mi'being inter
posed between the plate and the cross pieces to
45 zontal portion of the frame, joined to the'de? provide a resilient mounting. The stud 45 ex- 45
scribed part by means of screws I1, comprises the ' tends upwardly and carries a roller 50 working in
cross pieces l0 and the outer ring l9.
a groove provided in the cam plate 5| that is
Within the cross pieces I provide slots 20, two
being provided in each cross‘ arm and extending pinned to the motor shaft.
It will be noted that the rotation ofv the motor
50 parallel to the longitudinal axis of the arm.
Trowel I plates 2 l , four of which are shown,
formed as segments of a circle, are each provided
with two upstanding studs 22 that project through
the slots l8. Springs 23 resting against the plates
‘5 at one end and against washers 24 at the other end
and the cam plate will cause a movement of the
trowel plate that is a combination of reciproca
tion and oscillation. Of course, if desired, the
motion may be straight reciprocation by making
all the slots parallel to a single line of move- 55
2
9,108,470
ment, but the motion described is considered pref,
erable for troweling action.
It is obvious that I have described but one
trowel plates beneath the frame, said plates
having upwardly'projecting studs 'ensasins said
slots, a motor and a cam rotated thereby and
engaging said studs for e?ecting motion of said
unit of a machine that may include a number of
cam plates, all having a desired reciprocating
plates in paths defined by said slots.
movement, and I wish it understood that such
additional plates, or divisions of the plate shown,
6. In combination, a frame providing slots, a
trowelbeneath the frame having studs project
ing upwardly into said slots, a motor supported
is contemplated.
’
The shape, form and disposition of the trowel
10 plates, is unimportant and these features, to
gether with those relating to the method of bring
ing about reciprocation, may be varied within the
skill of the mechanic.
I claim:
1. In combination, a frame having a horizontal
16
member providing a slot, a trowel plate having a
portion projecting through said slot, a motor, a
plate having a cam groove secured to the motor
shaft, the upwardly projecting portion of the
20 trowel stud engaging said groove.
2. In a troweling machine, the combination of
a frame providing horizontal cross pieces having
slots, a trowel plate having studs projecting
through said slots, and a motor having a cam
25 plate adapted to engage a stud and effect recipro
cation of the trowel plate in a path de?ned by
the slots.
3. In a troweling machine, the combination of
a frame providing horizontal cross pieces having
30 slots, a trowel plate having studs projecting
through said slots, spring means between the
trowel plate and cross pieces, and a motor having
on the frame, and means between the motor and
the trowel for effecting reciprocation thereof in 10
the path defined by said slots, and. meam for
mounting said frame for bodily rotation.
7. In combination, a frame having horizontal
members providing slots, a trowel plate having
studs projecting upwardly into said slots, a 15
motor, means operated by the motor for e?ect
ing movement of the plate, and means for mount
ing said frame for rotation relative to said motor.
8. In combination, a frame providing a plu
rality of angularly disposed slots, a plurality of
trowel plates beneath the frame, said plates
having upwardly projecting studs engaging said
slots, a motor for reciprocating the slots in an
gular relation to each other through said slots,
and means for mounting said frame for rotation
relative to said motor.
9. In combination, a frame providing a plu
rality of angularly disposed slots, a plurality of
trowel plates beneath the frame, said plates
having upwardly projecting studs engaging said
slots, a motor and a cam rotated thereby and
engaging said studs for effecting motion of said
a cam plate adapted to engage a stud and eifect
plates in paths defined by said slots, and means
reciprocation of the trowel plate in a path de
for mounting said frame for rotation relative to
35 ?ned by the slots.
said motor.
4. In a troweling machine, the combination of '
10. In combination, a frame providing slots ex
a frame providing horizontal cross pieces having
tending
radially from the center of the frame, a
slots, at least one of which is eccentric to the
longitudinal axis of the pieces. a trowel plate trowel beneath the frame having studs project
ing upwardly through said slots, a motor sup
40 having studs projecting through said slots and a
motor having a cam plate adapted to engage a ported on the frame, and means operated by the
stud and effect reciprocation of the trowel plate motor and above said slotted frame for effecting
in a path de?ned by the slots.
5. In combination, a frame providing a plu
45 rality of. angularly disposed slots, a plurality of
reciprocation of the trowel in the path de?ned by
said slots.
>
HAROLD S. BQULTON.
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