US1661217A - Power-driven butcher saw - Google Patents

Description

March 6, 1928.

F. FARRELL POWER DRIVEN BUTCHER SAW E Farrel Z v m Q a m h \N INVENTOR ATTORNEY Patented Mar. 6, 1928.

FRED FARRELL, OI SLCRAIENTO, CALIFORNIA.

POWER-DRIVEN BUTCHER SAW.

Application me luck 0, 1920. Serial No. 93,050.

This invention relates to improvements in saws and particularly to meat and bone cutting saws such as are used by butchers.

The principal object of my invention is to provide a hand saw, that is one to be entirely supported and guided by the human hand, having a self-contained power mechanism for operating the blade of the saw.

The construction is such that the operator need only hold and guide the saw frame in place and exert the necessary downward pressure on the same, and does not have to move the arm back and forth to obtain the cutting action, as is the case with the usual hand saw.

There are certain power saws already on the market for butchers use, but as far as I am aware, these are all large and nonportable devices, not suitable nor lntended to be used in cutting individual steaks, chops and the like. My saw on the other hand is a small portable structure. whlch may be used by the individual butchers wherever they happen to be located, for any operations where the present hand saws are used.

A further object of the invention is to produce a simple and inexpensive devlce and yet one which will be exceedmglyeifectwe for the purpose for which It is deslgned.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

Fig. 1 is a side elevation of my improved saw. Fig. 2 is a vertical section on the line 2-2 of Fig. 1.

Referring now more particularly to the characters of reference on the drawings, the numeral 1 denotes the main frame, formed with downwardly depending arms 2, one at one end and the other intermediate the ends of the frame, and with another similarly dis posed arm 3 at the other end.

Bearing sleeves 4 are provided at the ends of the arms 2, in which sleeves are slidably mounted opposed and alined stems or shafts 5 which project ri idly from the ends of an auxiliary arch rame 6 which is transversely alined with the frame 1 and dis osed between the arms 2. The length 0 the frame 6 is sufliciently less than the distance between said arms to allow of a predetermined longitudinal travel of the frame 6 relative to the frame 1.

Lugs 7 facing each other are provided on the endsof the frame 6, from which lugs pins 8 project laterally to en age and support an ordinary form of hue -saw blade 9. The lug adjacent the outermost arm 2 is in the form of a stem longitudinally slidable 1n the adjacent stem 5, with a take-up means 10 to come from therebetween, to enable the tension of the blade to be altered at will.

Between the inner arm 2 and the arm 3 a bevel gear 11 is disposed. The central shaft 12 of this gear is disposed horizontally and transversely of the frame 1 and is horizontally alined with the stems 5, bein su ported by an arm 13 depending from t e rame 1. A slotted cross-head 14 is fixed on the adjacent stem 5 and extends alon side the gear 11. A block 15 is slidable in t e cross-head, said block being fixed on a crank pin 16 mounted on the gear.

The gear meshes with a pinion 17 whose shaft is mounted in a sleeve 18 provided on the lower end of the arm 3. A small elecr tric motor 19 whose shaft is alined with and connected to the pinion shaft is secured to the arm 3 outside the same. A handle 20 through which the flexible current conducting cable 21 to the motor passes, projects longitudinally from the motor.

In operation it will be seen that with the driving of the motor the frame 6 and blade 9 are reciprocated through a distance governed by the throw of the crank pin 16, thus imparting the necessary sawing action to the blade. With this operation the frame 1, which is supported and maintained in the necessary position by the operator gripping the handle 20, remains stationary relative to the saw blade.

The axis of the motor and the handle are preferably in transverse alinement with the stems 5, so as to provide the proper lateral balance for the tool and enable the operator to easily support the tool in the desired position relative to the material being cut with a minimum of effort.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this s ecification sets forth in detail the present an preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

1. A owe'r saw comprising a main frame, an auxi iary frame transversely alined with the main frame, longitudinally alined stems projecting from the ends of the auxiliary rame an slidable in the main frame, means mounted in connection with the stems for supfiorting a saw in longitudinal alinement wit the stems, a motor axially alined with the stems mounte-d'on the main frame be 0nd the auxiliary frame, a slotted cross ead mounted on the adjacent stem, the slot of said crosshead being at an angle to the stem, a gear driven from the motor mounted on s the main frame and to 'one side of the crosshead in a plane parallel thereto, and a block part longitudinal reciprocating movement to the crosshead and stem with the rotation of the gear.

2. A ower saw comprising a main frame, an auxi iary frame transversel alined with the main frame and arranged or longitudinal movement relative thereto, longitudinally alined stems projecting from the ends of the auxiliary frame, bearing means on the main frame in which said stems are slidable, means applied to one stem for reciprocating the auxiliary frame, another stem slidable in the other stem of the auxiliary frame, take-up means between the cooperating stems, and means on said slidable stem and on the opposite end of the auxiliary frame for supporting a saw. 9

In testimony whereof I afiix my signature.

FRED FARRELL.

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