US2667824A - Blade attaching means - Google Patents

Description

Feb. 2, 1954 H. E. M CRERY BLADE ATTACHING MEANS Filed March 19, 1947 Patented Feb. 2, 1954 BLADE ATTACHING MEANS Harold E. McCrery, Dayton, Ohio, assignor, by

mesne assignments, to Master Vibrator Company, Dayton, Ohio, a corporation of Ohio Application March 19, 1947, Serial No. 735,627

This invention pertains to surfacing implements, and more particularly to an apparatus having progressive wiping engagement over the surface upon which it is operated.

While for illustrative purposes, the invention is herein shown and described as embodied in a power .operated concrete troweling machine or float for finishing concrete surfaces, of the type shown and described in the copending application of Harold S. Boulton, Serial No. 721,574, filed January 11, 1947, now Patent No. 2,605,683, it is equally applicable to other types of apparatus or to hand troweling blades. By substitution of suitable work engaging elements, the present construction may be used in assembling scrubbing brushes, abrasive work surfaces, or soft polishing surfaces.

The object of the present invention is to improve the construction of surface treating equipment whereby it may not only be economically constructed, but will be more efficient in use, uniform in action, of longer life, and be unlikely to get out of repair.

A further object of the invention is to minimize the time and labor required in the manu-,=-;

' the mounting of such surface treating implements;

A further and important object of the invention is to minimize the cost of repair or replacement of surface treating equipment of the present type.

A further object of the invention is to provide a mounting for surface treating implements embodying the advantageous structural features, the inherent meritorious characteristics and the mode of construction herein set forth, or their equivalents.

With the above primary and other incidental objects in view as will more fully appear in the specification, the invention intended to be protected by Letters Patent consists of the features of construction, the parts and combinations thereof, and the mode of operation, as hereinafter described or illustrated in the accompanying drawings, or their equivalents.

In the accompanying drawings, wherein is shown the preferred, but obviously not necessarily the only form of embodiment of the invention,

Fig. 1 is a perspective view of a power driven rotary concrete surfacing machine in which the present invention is embodied.

Claims. (01. 94-45) Fig. 2 is a fragmentary perspective view, partly in section, of the blade mounting assembly.

1 Fig. 3 is a fragmentary perspective view, partly in section, of a blade assembly with the mounting bar in place.

Fig. 4 is a perspective view of a manual troweling blade embodying the present invention.

Figs. 5 and 6 are fragmentary perspective Views, similar to Figs. 2 and 3, showing a modified form of construction.

Like parts are indicated by similar characters of reference throughout the several views.

The present disclosure is an improvement and :further development of that shown and described in my pending application Serial No. 681,711, filed July 6, 1946, now Patent No. 2,594,331, and a further improvement of the invention claimed in the aforementioned Boulton application, of which pertinent portions are herein shown and described for illustrative purposes, but which, per se, form no part of the instant invention which is directed to the means of assembling the surfacing elements to the power driven apparatus of the above applications, or to appropriate handles for manual operation.

Referring to the accompanying drawing, the

rotary surfacing machine in Fig. 1, comprises a rotary base I from which radiate a plurality of reversible sweeps 2-2, surrounded by a guard ring 3 upon which the outer ends of the sweeps 2 are pivoted. Located in axial relation above the revoluble base I is a gear housing 4 surmounted by a driving motor 5. The motor shown in Fig. 1 is a conventional explosive engine or hydrocarbon motor. An electric motor may be substituted for the explosive engine 5. A driving pulley 6 of the motor, of whatever type, is connected by V belt with a driven pulley 8 of the gear driving mechanism within the housing 4. A handle 9 extends upwardly and radially from the housing 4 for controlling and guiding the machine. Manually operated control devices It) mounted on the handle 9 within easy reach of the operator, are connected through the handle shaft with the actuating motor 5.

The power transmission, driving, and adjusting features of the instant disclosure are substantially those of the copending applications aforementioned, to which reference is made.

Other types of surfacing elements may be substituted for the troweling plates l8|9, thereby converting the present power driven apparatus for types of work other than concrete surfacing.

The instant sweeps 2 comprise vertically disposed angle bars ll having laterally projecting marginal flanges [2. To the inner ends of the angle bars H are welded short rectangular bars [3 which extend beyond the angle bars as cylindrical trunnion shafts I4 aligned with the center line of the angle bars H. At the opposite ends of the angle bars ll there are welded thereto in axial alignment with the trunnions l4 rectangular collars $16 within which engage :ltrunnion studs l? welded to the surrounding guard ring? The web portions of the angle bars H are disposed substantially coincident with the radii'df the horizontal axis about which the sweepszsar'e adjustable. Attached to the bottom flange of the bars II are surface platesior 'fioatsf8"which are comparatively wide and pertain-thermal concrete surfacing operations of distributing and leveling the concrete material. Addition'al flanges similar to the flanges [2 project fromthe top of the angle bars H in a direction oppb's'iteto flanges l2, finishing or secondary plates 19 being secured to suchadditional flanges. The construction Ofthe -finiSh-ingmabhine shown in Fig. -1 is {such thatthe barS l i may berotated about their trunnions through 180 degrees to bring either the plates it; or is into contact engagement withthe surface being treated.

v rrie reregemg ner descriptidn of the'mach'ine "of F-ig'. l is; simply for the purpose of illustrating "one type dfm'ach-ine' in which" the subjectmatter of the instant invention may be"ut'ilized,"s'uc'h "machine forming no part fof the presentinvention and "to whicnthepresent 'inventionisinno To connect the blades to the-flahges l2 each "blade is prdvi'dd with a longitudinal "extending channel member'ee, Secured tothe blade "by spot "Welding or-other means at longitudinally "sp aced intervals. 'The channel memberflfi i'sfo'rmed with nausea portion 2 i the "bottom-thereof there- "by providing longitudinally "extending beads 22 'onthe bottom'of the channelt'arrd'atthe'edges fthemonfwmcn have *contact engagement with he fi Y At relatively "spacedintervals "throughout the oi the channel, the raised portion-21 is h h 'ted'byjdepr'essionsfiit. "SdchdepreSSions :jzs *fiusnwith the b ottornf or the beads ZZahd the "surface bft'he bla'de when the chan- "n'el is placed'there'on. u I v irnerchenn'e is secureaiite the blade by"s'p'bt welding br riveting, the lattachmentibeihg made coincideiitwithTthe depressions 23. The depres- 'fsidn's are "pr vide ror this purpose jsi'nce "it is impractical, "1r not 'iin'ptis'sible, t interconnect theraisd'poi'tifinsl'l ah'd'tfie blafie. fLocatedwithihthe c anneijzs an restifiguptn .theraisedl'portidns :1 thereof, isa'bar M'wliih interconnects the blade ass ernb'ly'lafll 'vvith then-asses T2.'of lithe vanglebars fl. The 1156;- ftibns :21 of I the manner, are raised to providesup- Qport fori the bar 2 3 in spaced'relatioh with the Bottom 1dr the channel; Suchcha'nnls arearawn .vvith a's liglit radius in thelcdrner's thereoi 'tvhich, wer'e 'it iibt for'the .esrist ence (if lilieraised portions 2 i, would prevent'solid well supported seatfing engagement of arectangularbar therewithiil. Shbuld an"'atterript"beima'deto seati'the bar 'cn'th'e' bottom' or scon'vemionnchannermember,'the"longitudinal"edges of the "bar mustbe reduced to conformity with 'the ra'dius oi the channel. This is quite diflicult from a practical "standpoint "since the "channels are 'not uniform andinterchangeabilitybfparts is' practically impossible. To overcome thisfiifiicult and expensive-operation; the presentbhannels 2e are initially formed with the raised portions 2| therein upon which the rectangular bar 24 may rest in elevated relation with the extreme bottom of the channel. The elevation is just sufiicient to support the lower edge of the bar 24 above the bend in the channel. With this construction the bar 24 is located within the vertical limits of the parallel :isi'd me b rs of'the channel 'aiidih elevated relatitin with the ar'cuate corners interciinhecting the it; vertical and horizontal portions of the channel.

This method of construction is well adapted to m'a ssiproduction and assembly, since the parts are all interchangeable. Furthermore the bar 24 firmlysuppbited since the greater portion of ii *itnepo m eiffiilie channel is raised to be in supporting engagement with the bar.

-1A ='-series sofiisransversely aligned holes 25 are located-in the side portions of the channel, in registr with the transverse holes 25 in the bar. The bar 24 is secured in position within the chaneleven by' 'thebolts "2'1 avhich pass'through the 'nsv'er'sely aligned neie's z 5. arid- 215 the cnan- =-iie1 and barres eetivery. v

There is also-provided in 'the top "surfaceeof the pares a seriesfof vertical holes '28 which are tapped'to 'receiv'e' tr-ie bolts 2'9 withwhichthe a'sstemmed bar aeeblade a e s'ecur-edvto the flanges i 2' of 'the' ariglebars =4 r-otheriearriers.

I "The present-assembly. is equally?- applicable'i'to 30 "other carriersats for eicaniplea han'd trowel as shown in Fig. v -1n"' place selfsecuring ith :b'ar i andattabhedahannel and bladetothe flange "$2 of the angle bars 'l of the lpower Edrivent'machin'e," it 'rnay be iattached to a handleiafl 'having fls' longitudinally "extending projections 31 "with which-the bolts zl "are engage'd.

The angle bars II or handle 1 30 iarescarrier members, 'whichgfiogether Withathei-bar 2dfpro- 7 wide a carrier fdr-fthe blade assembly comprising eil the bla'de sor 1 9- ogether withtne channei izu which is secured'there-to.

N'o't drfly shes "the present s'i'irt-i ctur'e permit rapid and efficient assembly 6f" rewslm'g blades, -but the riun rberkif-fneessary manufacturing op- 45 'ereition'sis maten e ream a. The-clia nlsit ere-preformed and 'need only be "cutjto 't edesired length and drilled. The bars stare-used *esitney are attained'rromthemins with-tin a ciittihg; drilling "and tapping operation" required. Theonlyother. manufacturing operation rem-tired is the wldmglorl riveting ofth'e Jhan'nel's 29 to eble s In Figs. 5 and 6 "there is shown an alternative form of :constructi-on in which the samelobjecchannel 20. J r *In' this embodiment efQthe +invention,-a:standiard channeli-form-32 directlyysecured to-the blade by means of the large head rivets 33. :The rivetiheads are FOf Qsuihcient heighth *to accom- .plisir thee samezpurpose asfthe elevations 2 I a-irr the channleilaine to support:the'inountingbar' fld zinielevateii relatmnmi-thrthe bottonrdf theeehanwe 34 on the under SiHe dithe bIaiie"pfotiuciii .tivesare obtai-i'ied, without :the use Jo f a special a substantially smooth uninterrupted surface thereon.

As shown in the drawing, the bar 24 when placed within the channel 32 rests upon and is supported by the rivet heads 33 in elevated spaced relation with the bottom of the channel. The bar is secured within the channel in the same manner as previously secured.

The present construction also permits efiicient and economical replacement of blades. Due to the continual movement of the blades over rough and abrasive surfaces, they of course rapidly show signs of wear, and within a short time become unsuitable for further use. To replace worn blades it is only necessary to remove the three bolts 21, remove the worn blade and substitute a new one therefor. Because of the low cost production of the blade and channel assembly, the replacement blade is of low cost and easily obtainable. It should be noted that it is unnecessary to discard the blade mounting means, whether of the mechanical or hand type, when the blade becomes worn, but only the blade is replaced.

The present blade assembly is highly resistant to longitudinal flexing, since it is reinforced by the channel 20. Yet this highly desirable rigidity is achieved at very little additional expense and with very little additional weight or bulk. This is an important feature whether the blade is to form a part of a power driven machine, or merely a hand trowel.

From the above description it will be apparent that there is thus provided a device of the character described possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible of modification in its form, proportions, detail construction and arrangement of parts without departing from the principle involved or sacrificing any of its advantages.

While in order to comply with the statute the invention has been described in language more or less specific as to structural features, it is to be understood that the invention is not limited to the specific features shown, but that the means and construction herein disclosed comprise the preferred form of several modes of putting the invention into eifect, and the invention is therefore claimed in any of its forms or modifications Within the legitimate and valid scope of the appended claims.

Having thus described my invention, I claim:

1. An implement for troweling cementitious surfaces of the type wherein a troweling blade is attached to a traveling carrier member, including a longitudinally extending channel member having curved corners secured to the blade, elevated portions in the bottom of said channel, said portions being in elevated spaced relation with the blade, and inwardly spaced relative to the sides of said channel, mounting means therefor comprising a rectangular bar seated within the channel upon the elevated portions thereof, and in contacting relation with the sides of said channel, and means for detachably interconnecting the carrier member and the channel with said interposed mounting means.

2. An implement for surfacing floors of the type wherein a work tool is attached to a traveling carrier member, including a channel member having curved corners, a series of spaced rivets interconnectin the channel member and work tool, enlarged heads on said rivets providing a series of spaced supporting areas in elevated relation with the bottom of the channel member, a coupling member having a fiat lower face engageable within the channel member in contacting relation with the side walls of said channel and seated upon the elevated supporting areas in elevated spaced relation with the bottom of said channel, and engaging means detachably interconnecting the coupling member with the carrier member and with the channel member.

3. An implement for troweling cementitious surfaces of the type wherein a troweling blade is attached to a traveling carrier member, includin a longitudinally extending channel member having curved corners secured to the blade, elevated portions in the bottom of said channel, said portions being in elevated spaced relation with the blade, and inwardly spaced relative to the sides of said channel, mounting means therefor comprising a bar having a flat lower face seated within the channel upon the elevated portions thereof, and in contacting relation with the sides of said channel, and means for detachably interconnecting the carrier member and the channel with said interposed mounting means.

4. An implement for troweling cementitious surfaces of the type wherein a troweling blade is attached to a carrier, including a longitudinally extended channel member having curved corners and secured to the blade, elevated portions in the bottom of said channel, said portions being in spaced relation to the blade and inwardly spaced relative to the sides of the channel, said carrier having a flat lower face seated within the channel upon the elevated portion thereof and in contacting relation with the sides of said channel, and means detachably interconnecting the carrier and the channel.

5. An implement for troweling cementitious surfaces of the type wherein a troweling blade is attached to a traveling carrier member, including a longitudinally extending channel member r having curved corners secured to the blade, an

elevated portion in the bottom of said channel, said portion being in elevated spaced relation with the blade, and inwardly spaced relative to the said sides of said channel, a series of spaced depressions interrupting said elevated portion and secured to said blade, mounting means therefor comprising a bar seated within the channel upon the elevated portion thereof, and in contacting relation with the sides of said channel, and means for detachably interconnecting the carrier member and the channel with said interposed mounting means.

HAROLD E. MCCRERY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 92,506 Ault July 13, 1869 425,110 Smith Apr. 8, 1890 653,795 Ecke July 17, 1900 838,608 Curwen Dec. 18, 1906 961,302 Linville June 14, 1910 1,121,281 Olson Dec. 15, 1914 1,501,192 Severns July 15, 1924 2,048,529 Williams July 21, 1936 2,083,400 Rose et al. June 8, 1937 2,392,932 Macbeth Jan. 15, 1946

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