US2108470A

US2108470A - Floor troweling machine

Info

Publication number: US2108470A
Application number: US117843A
Authority: US
Inventors: Harold S Boulton
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-12-28
Filing date: 1936-12-28
Publication date: 1938-02-15
Anticipated expiration: 1955-02-15

Description

Feb. 15, 1938. H. s. BOULTON FLOOR TRQWELING MACHINE Filed Dec. 28, 1936 2 Sheets-Sheet l ',,,,,,,,,,,,.vlllihwnlj Feb. 15, 1938. H. s. BOULTON FLOOR TROWELING MACHINE Filed Dec 28, 1936 2 Sheets-Sheet 2 Patented Feb. 15, 1938 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.

My invention relates to trowellng machines and particularly to an improvement on the construction shown in my copending application, Serial No. 29,901, filed July 5, 1935, Patent No. 2,065,560.

5 An object of my invention is toprovide means for effecting a reciprocating movement of the troweling plate or plates as distinguished from a rotary movement such as disclosed in my copending application heretofore referred to. While such movement has been considered to be desirable, its accomplishment has been found to be difilcult, due to complications of design and increase in weight and cost of the necessary apparatus. An object of my invention is to bring about the desired movement by the use of mechanism of extreme simplicity and relatively light weight.

Collateral to the desired reciprocating movement, I provide for a simultaneous rotating movement, thus simulating with substantial exactness the hand troweling movement of an experienced 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 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 modified form. of troweling apparatus and;

Fig. 6 is a sectional view on the line Fig. 5.

In the drawings I have illustrated a motor and frame it] having an operating handle l I.- To the hub l2 of the motor frame is connected, through a thrust-bearing 03, a frame comprising an inner ring I, arms 55 and an outer ring it. A horizontal portion of the frame, joined to the'de scribed part by means of screws I1, comprises the serve to support the plates in their spaced relation. The outer studs on each plate project upwardly beyond their motion-limiting nuts 25 and terminate in rollers 26 that engage in the cam groove 21 in a cam plate 28 that is pinned to the motor drive shaft 29.

A lug 30 and a latch 3| provide for locking the frame and its associated parts against rotation.

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.

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 driving force of the cam plate will tend to rotate the entire frame on its thrust-bearing and thus there will be combined rotary and reciprocating movement of the trowels. If the rotation is not desired, the latch 34 may be dropped and the parts 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 understood, of course, that in addition to the reciprocating and rotary movement, the entire machine will be propelled forward by the workman, thus adding a third movement to the plates.

In the construction shown in Figs. 5 and 6' the motor frame remains the same and this is likewise true of the troweler frame, the latter consisting 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 5 M) parallel to the long axis of the cross piece. The arm 31 is provided with a slotil that is eccentric to the long axis of the piece while the

arms

35, 38 have slots 42, 43 thatare also eccentric, but slightly less than the slot 4|. A single trowel plate 44 is provided withfour upstanding studs 45, it, 01 and 48 that extend through the slots 00, ll, 42, 43 respectively, springs Mi'being interposed between the plate and the cross pieces to provide a resilient mounting. The stud ex- 45 tends upwardly and carries a roller 50 working in a groove provided in the cam plate 5| that is pinned to the motor shaft.

It will be noted that the rotation ofv the motor and the cam plate will cause a movement of the trowel plate that is a combination of reciprocation and oscillation. Of course, if desired, the motion may be straight reciprocation by making all the slots parallel to a single line of movement, but the motion described is considered pref erable for troweling action.

It is obvious that I have described but one unit of a machine that may include a number of cam plates, all having a desired reciprocating movement, and I wish it understood that such additional plates, or divisions of the plate shown, is contemplated.

The shape, form and disposition of the trowel plates, is unimportant and these features, together with those relating to the method of bringing about reciprocation, may be varied within the skill of the mechanic.

I claim:

1. In combination, a frame having a horizontal 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 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 plate adapted to engage a stud and effect reciprocation of the trowel plate in a path defined by the slots.

3. In a troweling machine, the combination of a frame providing horizontal cross pieces havin slots, a trowel plate having studs projecting through said slots, spring means between the trowel plate and cross pieces, and a motor having a cam plate adapted to engage a stud and eifect reciprocation of the trowel plate in a path defined by the slots.

4. In a troweling machine, the combination of a frame providing horizontal cross pieces having slots, at least one of which is eccentric to the longitudinal axis of the pieces. a trowel plate having studs projecting through said slots and a motor having a cam plate adapted to engage a stud and effect reciprocation of the trowel plate in a path defined by the slots.

5. In combination, a frame providing a plurality of. angularly disposed slots, a plurality of trowel plates beneath the frame, said plates having upwardly'projecting studs 'ensasi s said slots, a motor and a cam rotated thereby and eng ing said studs for eflecting motion of said plates in paths defined by said slots.

6. In combination, a frame providing slots, a trowelbeneath the frame having studs projecting upwardly into said slots, a motor supported on the frame, and means between the motor and the trowel for effecting reciprocation thereof in 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 motor, means operated by the motor for eflecting movement of the plate, and means for mounting said frame for rotation relative to said motor.

8. In combination, a frame providing a plurality 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 angular 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 plurality 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 plates in paths defined by said slots, and means for mounting said frame for rotation relative to said motor.

10. In combination, a frame providing slots extending radially from the center of the frame, a trowel beneath the frame having studs projecting upwardly through said slots, a motor supported on the frame, and means operated by the motor and above said slotted frame for effecting reciprocation of the trowel in the path defined by said slots.

HAROLD S. BQULTON.