Патент USA US2108470код для вставки
Feb. 15, 1938. 2,108,470 H. s. BOULTON FLOOR TRQWELING MACHINE Filed Dec. 28, 1936 2 Sheets-Sheet l I-I w $. "1,111.11, 1 ',‘,,,,,,,,,,,.vlllihwnlj 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.