US2581777A - Combination connecting and stabilizing bar for masonry saws - Google Patents

Description

Jan- 8, 1952 H. J. WRIGHT 2,581,777

COMBINATION CONNECTING ANO sTABILzzING BAR FOR NAsONRY sAws Filed Nov. 8, 1948 E '-5 (g4 BY M E 2W 2.

/i wrom/EK Patented Jan. 8, 1952 CMIHNATION CONNECTING AND STABI- LIZING BAR FOR MASONRY SAWS Harold J. Wright, Kansas City, Mo.,y assignorl to lClipper,lilanufacturing Company, Kansas. City,

, Mo., a. corporation of Missouri Application November 8, 1948, Serial No. 58,837 '2 claims. (ol. c25- 13) This invention relates to masonry saws of the type having a cutter head mounted for swinging movement on a substantially horizontal axis, the head being provided with 'a rotatable cutter disc at one end thereof.

One of the primary aims of this invention is to improve upon the masonryvsaws forming the subject matter of U. S. Letters Patent Numbers 2,171,024, dated August 29,1939-, 2,338,318, dated January 4, 1944, and 2,450,371, dated September 28, 1948, and more particularly to bring together in a new combination certain advantageous features of Patents 2,171,024 and 2,450,371.

In Patenty No. 2,450,371, there is disclosed novel means for permitting simple. adjustment of the cutter head, forming a part of a masonry saw,

this invention to provide a stabilizing means'forV supporting the cutter head with the cutterthereof in a given position, together with a foot operated actuating means for swinging the cutter to and from a position in operative engagement with the work being handled whenever the stabilizing means is in a released position.

Another important object of this invention is the provision of a. masonry saw having a cutter head that is swingably mounted on a horizontal axis andprovided with a depending member that is in turn connected with manually operable mechanism for reciprocating the same and thereby swinging the cutter head on its pivotal axis, the depending member being provided with a manually releasable clamping assembly for holding the member against reciprocable movement when it is desired to hold the cutter in a selected position.

A further object of the present invention is the provision of a masonry saw ofA the above mentioned character wherein the vertically reciprocable rod depending from the. cutter head is operably interconnected with a manually shiftable lever through the medium of a collar slidably mounted upon vthe rod and having manually releasable structure, for selectively interconnecting the sleeve and the rod at a number of positions on the latter. A still further object of this'invention is the 'provision of a masonry saw as above set forth wherein the aforesaid slidable sleeve and its mounting assembly is adapted to serve as a yfulcrum support for the upright rod that is con-- nected to the cutter head, to the end that the latter may be shifted to various positions with respect to the vertical and upon the supporting stand therefor.

Other more minor objects including details of construction will be made clear or become apparent as the following specication progresses; reference being had to the accompanying drawing,r wherein:

Fig. 1 is a side elevational view of a masonry saw having a combination connecting and stabilizing bar made in accordance with the present invention, parts being broken away and in irregular cross section to reveal details of construction.

Fig. 2 is an enlarged, fragmentary, vertical cross sectional view through the stabilizing means for the masonry saw.

Fig. 3 is a fragmentary, detailed cross-sectional view taken 'on irregular line III-III of Fig. 2, looking inthe direction of the arrows; and

Fig. 4 is a fragmentary, detailed, cross-sectional view taken on line IV-IV of Fig. 2.

InFig. 1 of the drawing, therel is shown a masonry saw having a stand broadly designated by the numeral I0, that includes a pair of'upright. front legs I2 and a pair ofv relatively long legs I4 that are interconnected by a horizontal tank I6 disposed adjacent. the uppermost ends of the front legs I2.

Each leg I2 of the stand IIl is in turn joined with-a corresponding leg I4 through the medium of a horizontal brace member I8. It is' noted that the legs I4 of the stand I0, are appreciably longer than the front legs I2 thereof, the uppermost ends of legs I4 being. provided with a plurality of notches 22 that extend downwardly and inwardly from the normally' foremost edge thereof.

A cutter head, broadly designated by the numeral 24', is disposed between the uppermost ends of therear legs I4, said cutter head 24 being pro-- vided with a platform 26 having a pair of opposed pintles 28, one only of which is illustrated in Fig. l of the drawing, that are slidablyv fitted into opposed notches 22 of the pai-r of legs: III. It

is noted that the outwardly extending pintles 28` on the platform 28 are4 disposed intermediate the ends of the platform 26 ata point substantially balancing the entire cutter head 24 when the remaining component parts thereof are attached thereto. Such parts include a disc 38 rotatably mounted upon the platform 26 directly above the tank I6 andan electric motor 32 mounted upon the uppermost face of platform 26 at the opposite end thereof. Rotative motion is imparted to the cutter disc 30 from the motor 32 by means of a belt or the like 34. e Y

An elongated tubular member 36 depends from that end of the platform 26 adjacent the motor 32, the uppermost end of the member 36 being pivotally connected to the platformV 26 as at 38. The lowermost end of the tubular member 36 terminates in spaced relationship to the supporting surface for the stand I8 and extends downwardly between a pair ofspaced jaws 48 and 42. These jaws 48 and 42 are both disposed between a pair of spaced apart arms 44 that extend outwardly and downwardly from the rearmost end of the stand I8 adjacent the legs I4 thereof.

outermost free ends thereof for pivotally receiving the jaw 48. Both of the jaws 48 and 42 have the faces thereof next adjacent the member 36 contoured arcuately to conform to the contour ofthe tubular member 36 and the jaw 42 is mounted upon a horizontal rod 48, disposed immediately below the tank I6.

n The jaw 42 has an internally tapped bore58 formed therethrough for intermeshing with external threads 52l formed'on the proximal end of the rod 48. That end of the rod 48 opposite to the threads 52 thereof terminates adjacent the front of the machine forwardly of legs I2 thereof after first passing through an opening 54 formed in bracket 56. Manual rotative motion is imparted to the rod 48 through the medium of a crank 58 secured to the rod 48 adjacent this forwardmost end thereof.

A cross bar 60 interconnects the arms 44 intermediate the ends thereof and is provided withv an opening 62 for rotatably supporting the shaft 48 adjacent the 4threads 52 thereof.

AV pair of collars 64 and 66 are releasably secured to the rod 48, said collars 64 and 66 being on opposite sides of the cross bar 68 to preventlongitudinal reciprocation of the latter. It is thus far clear that rotative movement of the rod` 48 in one direction through manipulation of the handle 58 will move the jaw 42 against the. vertical tubular member 36 to clamp theV same against the jaw 48 and thereby hold the member 36 against reciprocative movement on its longitudinal axis. Conversely, rotation of the rod 48 in the opposite direction will release the jaw 42. moving the same in the direction away from member 36 and toward the collar 64v whereby the member 36 is free to reciprocate longitudinally and swing on the pivotal point 38.

A sleeve 18 slidably mounted upon tubular member 36 below .the lowermost jaw 48 has a laterally .extending tube 12 thereon that is in register with Vsleeve 18 at the innermost end thereof.

A flexible cable 16 has one end thereof threaded into-the outermost end of a plunger 18 that is in -turn'telescoped within tube 12. Plunger 18 slides in .an opening formed in the free end wall of tube .12 and has an vout-turned flange 19thereon bearing against member 36.

Onel end ofthe plunger 18 extends through onebf a plurality of openings 88 formed in the A pivot pin 46 interconnects the arms 44 near the" ausm?? 4 tube 36. These openings 88 extend for a considerable distance along the tubular member 36 in a, relatively straight line as clearly illustrated in Figs. 1 and 2 of the drawing. The extent of movement of plunger 18 into the member 36 is controlled by the flange 19 and a spring 82 is coiled about plunger 18A for 'holding the latter biased against the member 36.

Assembly of plunger 18 into tube 12 is through an opening 83 formed in sleeve 10 in opposed co-axial relationship to tube 12.

Longitudinal sliding movement of plunger 18 withinthe tube 12 is accomplished manually through the mediumof a knob 84 on that end of cable 16 adjacent the bracket 56. Cable 16 is slidably mounted in a sleeve 86 held in position in bracket 66 by opposed lock nuts 88.

An elongated lever 94 is pivotally mounted intermediate the ends thereof upon a shaft 96 interconnecting the legs I4 below tank I6, the ends of lever 94 being bifurcated for pivotally receiving the sleeve 18 through the medium of a pair of opposed pintles 98 in the manner illustrated in Fig. 4 of the drawing.

Pintles 98 are, shouldered intermediate their ends and a lock washer 99 between such shoulder and sleeve 18 holds pintles 98 threaded in sleeve 18 and permits free relative movement between sleeve 18 and lever 94;

A relatively short link |88 has a spring |82 coiled upon the uppermost end thereof that is interposed between a wing nut |84 threaded upon the link |88 and a fitting |86 intermediate the ends of the link |88 and slidable freely thereon. A shoulder (not shown) is formed on the link |88 to limit the extent of downward sliding movement of fitting I 86 on the link I 88. The substantially horizontal lever 94 is joined to the fitting |86 through the medium of a pair of opposed pintles in much the same manner as illustrated in Fig. 4 of the drawing, one of such pintles being designated and shown by the numeral |88. The lowermost end of the link |88 is pivotally connected as at II8 to an elongated bar' II2 intermediate the ends of the latter.

One end of the bar I|2 is pivotally connected to the legs I4 through the medium of a shaft II4 thatinterconnects said rear legs I4. The opposite free end of the bar 2 terminates in a foot pedal I I6. Bar I|2 is yieldably held at the uppermost end of its path of travel through the medium of a spring II8 that has one end thereof connected directly to the bar II2 and the opposite end joined to a bracket |28 securedv to bracing members I8. The extent of upward movement of the bar II2 is limited by a rod |22 that depends from a cross brace (not shown) that interconnects the braces I8 intermediate the ends of the latter.

1 The open top tank I6 is designed for a cooling liquid, the means for directing such liquid to the cutter disc 38 forming no part of this invention and, therefore, need not be described. The uppermost longitudinal edges of the tank I6 carry a reciprocable work-receiving table I 24 through the medium of rollers |26 that ride directly upon such edges.

Assuming the cutter head 24 to be positioned as illustrated in Fig. 1 of the drawing with the pintles 28 thereof disposed within opposed notches 22, the operation is as follows:

When the rod 48 is rotated to the position for releasing the jaws 48 and 42, the tubular member 36 is freely reciprocable therebetween and, therefore, foot pressure imparted to the bar ||2 will cause corresponding swinging movement cf the cutter head 24 on the pintles 28. Downward movement of bar I I2 against the action of spring table |24 than that illustrated in Fig. 1 of the I drawing with the bar I I2 in the normal inoperative position by the simple expedient of withdrawing the plunger I8 to permit free sliding movement of sleeve 'I6 upon member 36. Sleeve 10 is then moved downwardly upon member 36 and the cable 16 released, permitting plunger I6 to enter another of the holes 80.

In the event that the operator is desirous of rigidly positioning the cutter at a predetermined distance above the table 24, the raising and lowering mechanism for the member 36 is not utilized. Instead, the rod 48 is rotated to bring the jaws and 42 into tight clamping relationship with the member 36.

When it becomes necessary to raise or lower the cutter head 24 with respect to the rear legs I4 by moving the pintles 28 from one pair of notches to another pair of notches 22, the jaws 40 and 42 are released and the cutter head 24 lifted from the notches 22 while the rearmost end of the platform 26 rests upon the member 36. The opposed pintles 98, supporting sleeve l0 will, thereupon serve as a fulcrum and permit swinging movement of the member 36 toward the jaw 42 as the pintles 28 are slipped from notches 22.

Before such adjustment of the cutter head 24 is to be made with respect to the legs I4, the sleeve 'I0 can be positioned at the most desirable point on member 36 to facilitate movement of the cutter head 24. Inasmuch as the jaw 42 moves toward the stand I0 when releasing action takes place, the swinging movement of member 36 as aforesaid, can take place.

When jaw 42 is in the fully retracted position, the threaded end of rod 48 determines the swinging limit of member 36, which is sufllcient to permit changing of pintles 28.

Cutter 30 need only swing a distance that is less than the radius thereof, and therefore, the `iaw 46 will not interfere with movement of the sleeve 10.

To the end that cable 'I6 will not become entangled with spring |02, the sleeve 86 is disposed in an'oifset position with respect to the longitudinal center of stand I0.

It is to be noted also that jaw 42 slides between the arms 44 and cannot rotate therebetween as y rod 48 is rotated.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of parts without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hereinabove described be ing merely a preferred embodiment thereof.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. In power saw construction having a swingable cutter head, an elongated member depending from the cutter head at one end thereof and pivotally connected thereto, and a swingable lever for reciprocating the member to swing the cutter head; `means joining the lever to the member at selected positions along the length thereof, said means comprising a sleeve crcumscribing the member, said member having a row ofi-,spaced openings formed therein and extending longitudinally thereof; a spring loaded plunger carried by the sleeve and adapted to be received by any one of said openings; and means pivotally joining the lever and the sleeve. l

2. In a power saw construction having a stand, a cutter head swingably mounted on said stand, an elongated member depending from the cutter head at one end thereof and pivotally'connected thereto, and a swingable lever mounted on said stand for reciprocating said elongated member to swing said cutter head; a sleeve member circumscribing said elongated member, said sleeve member being slidable on said elongated member and connected to said swingable lever, locking means mounted on said sleeve member forV engaging said elongated member to prevent relative movement therebetween, biasing means mounted on said sleeve member for normally urging said locking means into engagement with said elongated member, and lock operating means mounted on said stand and connected to said locking means for moving said locking means to a position out of engagement with said elongated member whereby said swingable lever may be secured by said locking means to said elongated member at selected points along the length thereof.

HAROLD J. WRIGHT.

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

UNITED STATES PATENTS Number Name Date 671,703 Kelly 1 Apr. 9, 1901 1,023,389 Olsen Apr.y 16, 1912 1,552,968 Trotter Sept. 8, 1925 2,171,024 Coates Aug. 29, 1939 2,180,743 Martin Nov. 2l, 1939 2,377,437 Martin June 5, 1945 2,441,535 Sanders May 11, 1948 2,450,371 Coates Sept. 28, 1948 2,455,113 Coates Nov. 30, 1948

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