US2514826A

US2514826A - Masonry saw

Info

Publication number: US2514826A
Application number: US55313A
Authority: US
Inventors: Edward A Zuzelo
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-10-19
Filing date: 1948-10-19
Publication date: 1950-07-11
Anticipated expiration: 1967-07-11

Description

July 11, 195o Filed Oct. 19, 1948 3 Sheets-Sheet 1 7 39 J 23 k'l mi EM! 'MH 'if/9 24 27 l ill Il Il o i 0 I Il |26 8 .6 r leA O I4 I5 la EDWARD AlUZELO INVENTOR.

ATTORNEY July 1l, 1950 E. A. zUzELo 2,514,826

MAsoNRY SAW Filed Oct. 19, 1948 3 Sheets-Sheet 2 FIG2 Flc-1.6 g@

EDWARD A.zUzE| o l JNVENTOR.

ATTORNEY Z 5 July ll, 1950 E, A, ZUZELQ 2,514,826

MAsoNRY sAw Filed oct. 19, 1948 s sheetsheet s 2e FIG.-3

EDWARD A. ZUZELO INVENTOR.

ATTORNEY Patented July 11, 1.1950

Myyinventio'nI is an improved sawfor cutting masonry and various other mineral and clay type materials used in the construction of buildings.

Heretofore, sawsof this general type havebeen de'cient vin 'that'wthe breakage o f the cutting blades has been excessive. 4'My improvements pre-l vent excessive operator pressure on the cuttting blade and thereby eliminates the primary cause of theun'du'e stresses and strains which shorten` the cuttingbladelifeit l VTheV rncipaly ybjects of'my invention vare to provide la masonry ysaw having a constant,vpre determined "pressurey `on^"the j-cutting *blade throughout the'r length of 'the cut; to provide means for securing thecutting blade in any desired cutting positionyto `provide means 'for' varying the 'height'of the platform above the -base carriage without lifting the platform` from its supports; an'dto provide mean's'for adjusting the pressure on the cutting blade.

Fig. ll is a perspective elevational view of my masonry saw embodying my improvements; Fig. 2 is a side elevational View of the masonry saw 'partly cutfaway and partlyin cross-section; Fig. 3 is a top plane view taken at `'the level of the platform andnpartlycut away; Fig. iris an enlarged top plane view takenvon the line 4-4 of Fig-"2 showing in detail the operation o fwthe locking device; Fi`g.5 is an enlarged perspective view of a stonY of'thefoot leverextensionand platform bar; Figli is an enlarged side elevational view of one of the platform supporting linkages.

As illustrated in the drawings, my preferred form of masonry saw comprises a cutting blade I journalled on -a shaft mounted on a platform' 2 which carries the motor 3 for driving the blade I by means of endless belts 4 secured to the shafts of the motor 3 and cutting blade I.

The platform 2 pivots about a transverse bar 5v whose ends are seated in recesses 6 cut in the i end of the upper link member 'I which can support the platform 2 either directly from the bottom of the right angle channel-piece 24 forming part of the carriage base 8, or it may support the platform '2 indirectly by depending on the pin 9 and the lower link I0 which is mounted on a rod II and rotates therewith. The rod II has its ends journalled in the standard I2 projecting up from the carriage base 8.

The movement of the platform 2, which is unbalanced in favor of the cutting blade end of the platform, is controlled by the operator with the use of a foot lever I3 having an extension bar .I4 connected therewith and which is mounted on a `pivot member I5`having its ends journalled A. if" i l v4WMASNRY SAW n Edward VZuzelo,l\l-arberth,rPa.

I "f Appunti@ october '19, 194s, serial No. 55,313v

' Q cciainis. (Cries- 413).

in the rear legs of the carriage base 8. A dependingI arm I6 is secured to the platform 2, immediately behind the-pivot bar 5, andprojects downwardly to and through the opening I9 cut in theexten sion member which is attached to the bar I4.

rThe arm I'G has al series lof holes I'I cut in the loweriportion of the arm I6 for the insertion of a pin I8 which should be of 'sufficient lengthr to project beyond the limits of the opening I9. As

' can -beseen in Fig.` 5, the depending arm IIIv is not secured to the 'extension member 20 but mere# ly'projects through'zth'e opening I9 and is'free` to move downwardly through the opening. Its upward movem e'nt,'however,` is checked by the stud I8 meeting the bottom' surface of the extension member 20. I Thus, when the operator depresses the foot lever I3, thereby elevating the extension member `2l), the depending arm IIi is not drawn upward byv force of the foot `lever but follows lthe -movem'entlofthe extension arm 2l! on'ly'because` of the -force of gravity actingon the unbalanced platform, causing it to drop until the dependingfarm `Il has been drawnupto-a point where the pin I8l meets the undersurface of the extension member 20. As gravity is the only forceacting on the cutting blade it follows that for a given position of unbalance the .pressure at the cutting edge is constant at all times and is not subject to variations in the operators footl pressure. Thus, an even cut is assured. Springs 2| suspendedfrornl the `channel 22 .forming a part of the base 8 are attached to the foot lever I3 and are of sufficient strength to keep the foot lever I3 and cutting blade I in raised position when the foot lever I3 is released by the operator.

The height of the platform 2 may be varied to accommodate the variations in the size of the articles to be cut by rotation of the hand lever 23, which is an elongation of the supporting rod I I. As shown in Fig. 6, when the handle 23 is in an upright position the link II) mounted on the rod II leans against the rear channel of the standards I2. When, however, the handle 23 is'y turned downwardly the rod I I and, therefore, the link III, which is frozen to the rod II, rotates until the lower end of the link I0 carrying the pin 9 rests on the channel 24. The link member 1 and the rod 5 held by the link member 'I is thus shifted from the position shown in solid outline in Fig. 6 to the position shown in phantom outline. A. member I2a affixed to the standard I2 guides the pivot rod 5 in its movement from one position to the other. A locking screw 39 may be used to secure the links in given position against accidental turning of the handle 23.

The masonry or tile to be cut is placed on a carriage 25 mounted on wheels 26 which ride on the upturned edges of the channel 24 and can be moved therealong to the cutting position desired. The carriage 25 carries therewith an end member 2'I against which the masonry may be held for the positioning of the masonry in relation to the cutting blade I. After the masonry has been placed on the carriage 26 in suitable position, the foot lever I3 is depressed by the operator thereby raising the extension member upward alongi l' the bar I6. As the bar I'G is not fastened tothe extension member it does not necessarily move at the same rate of speed nor due to -theveiect of inertia at the same instant as the extension member 20 but varies its rate of movementiin proportion to the unbalance of the platform 2 about its pivot 5. The movement of the cutting blade I and the platform 2 about the pivot 5 causes the cuttingvblade I to come into Icontact with the masonry on the carriage and the unbalance of the platform about its pivot will produce a steady pressure to be applied to the cutting blade edge.v As the unbalance is constant the pressure is necessarily constant and the cutting blade I is thereby relieved of any undue strains or stresses that tend to shorten the life of the cutting blade. ,Y

The foot lever I3 may be dispensed with whenever the cutting bladefmay be secured inone position for cutting, To secure the cuttingvblade in a given position, the locking lever 28 is rotated clockwise about its pivot member. .

Therollers

29 and 30 mounted on the lever 28 thereby force the bar 3| to move counterclockwise about its pivot 32` bringingthe free end of the bar 3| into bearing contact with the depending arm |16 which on its other side bears against the platform lever 33 which in turn bears against the end of the stud 36 mounted in the bracket 35. The upper end of the platform lever 33 is fastened lto the end of the platform 2 adjacent the motor while the lower end is guided by the post 34 projecting from the bracket 35. The locking lever 28 can securely hold, the platform 2 in any desired position by the bearing friction between the members 3|, I6, 33- and the end of the` stud 35 even against the tension of the spring 2|. The bar 3| is securely held against jarring or vibration .by the

rollers

29 and 30.

The top of the cover 31 fitting over the belts 4 provides a slideway on which the weight 38 may be secured in various positions so as to vary the position of the center of gravity of the platform 2 thereby changing the pressure on the cutting blade. As the Weight 38 is moved toward the cutting blade end of the platform the transverse axis will move away from the pivot bar 5 toward the cutting blade and the pressure on the cuttingblade will varyproportionately. The position formaximumpressure on the cutting blade is that shown in Fig. 1.

inside of the cover shielding the cutting blade I 'which ejectstreams of water to both sides of the y cutting blade for Wet or dustless cutting.

Having'd'esc'ribe'dmy invention, I claim:

1.l A masonry saw comprising a base having standards, a platform mounted on a rod, a cutting .blade and motor for operating` said cutting blade mounted on opposite ends of said platform, said rod being positioned on the motor side of the transverse axis of said platform and having its ends recessed in links supported by said standards, means. for altering the position of said links to vary the-height of said platform and means for shifting the position of said transverseA axis.` y

k2. A masonry saw comprising a base, a platform mounted on pivot means above said base, a cutting blade mounted on one end of said platform, a motor mounted on the opposite end of said-platform, said cutting blade movable to and from said base, an arm secured to said platform between itsv transversel ends and projecting toward said base, a second arm depending from an end of `said platform and projecting toward said base and thefreeend'of said first named arm and means'to secure both of said arms against movement. A,

EDWARD A. ZUZELO.

' REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS `Martin Nov. 21, 1939