US1771035A - Meat saw - Google Patents

Description

July 22, 1930.

s. F. FEISTER MEAT SAW Filed April 19, 1927 INVENTOR. '40); g

A TTORNEYJV Patented July 22, was

PATE T ,OFFFHIE GEORGE r. rnrsrna, or MARICOIPA, CALIFORNIA MEAT saw Application filed April 19,

My invention relates to power driven saws for butchers use, and has for its principal object the provision of a simple, and easily and safely operated, power saw adapted to take the place of the ordinary butchers hand saw in cutting through the bones of meat.

Other objects of the invention are to pro vide means for holding the work while being sawed, especially means for holding small round bones; to provide'means for supporting the saw to relieve the operator of its weight; to provide suitable guards both to inclose the saw and to prevent the scattering of'bone dust; and toprovide means for auto,-

matically starting and stopping the saw.

Still further objects and advantages of the invention will become apparent from the following specification, which should be read with the understanding that the form, construction, and arrangement of the several parts therein described may be varied, within the limits of the claims hereto appended, without departing from the spirit oft-he invention as expressed in said claims With this in view a preferred embodiment of my invention willnow bedescribed fully with reference to the accompanying drawings, wherein Fig. 1 is a side elevationof my complete device. r

Fig. 2 is a vertical section taken in the di rection of the arrows on the line 2-2 of Fig. 1 and enlarged.

Fig. 3 is a horizontal section taken on the line 8-3 of Fig. 2.

In the drawings, and referringfor the moment to Fig. 1 thereof, the reference numeral 1 designates the usual butchers-blockon which the meat is cut. v 1 ard rigidly fixed to the floor adjacent the 7 block 1. 3 is avertically slidable bracket mountedupon the standard 2. I prefer to provide rollers as indicated at it-to reduce the friction between the collar 3 and the 5%; standard 2. There are preferably'three such rollers at the bottom of thecollar 3, two of which appear in the drawing, and three rollers atthe top of said collar, two of these also appearing in the drawing. A collar 5 is ad- 2 is a tubular stand-v 1 justably secured uponthe standard 2 to limit 1927. Serial No. 184,909.

the downward travel ofthe movable collar 3. An arm 6 extends horizontally from the collar '3, and is pivotally secured thereto by a bearing pin 7. A. chain or cable 8 is secured to the upper end of the pin 7 and passes over a pulley 9 mounted in a suitable bracket 10 at the upper end of the standard 2. The other end of the chain 8 extends downwardly within said standard, and is attached to a weight 11 adapted to counterbalance the collar 8 and the parts attached to it by means of the arm 6. V V

A second arm 12 is mounted for horizontal swinging movement at the end of the arm 6, a bearing 13, to be described later, being provided betwee'nsaid arms. The arm 12 sup-l ports a casting 14 which is the main carrying frame of the saw. A hearing 13 is provided between said arm 12 and said. cast ng 14: to permit the latter to turn freely in a horizontal plane. A preferred form of said bearing is shown in Fig. 2, and comprises a pin 15Isecured in the casting 14 and extending through the end of the arm 12. Roller bearings, as indicated at 16, are provided to reduce friction. The bearing 13 between the arms 6 and 12 is preferably similarly formed.

The frame casting 1-iis relatively wide and flat, and is hollow, as shown in Figs. 2and 3. At its lower end, itprovides a bearing 17, Fig. 2, for a horizontal shaft 18 upon which the saw 19 is mounted. An electric motor 20 is secured to the face of the casting 14: with its shaft 21 disposed preferably at an. angle of about 30 degrees from the horizontal,-asshown in Fig. 1. Themotorshaft 21 is connected with the saw shaft 18 by wormi gearing 22, Fig. 2, enclosed within a housing 23; An end thrustadjustmentis provided. for the saw sha'ft18 comprising anadjustmg screw 24 in the end of the bearing 17 and a hardened ball 25 in the'end of said shaft.

The circular saw'19.is secured to'the end of the shaft 18, in any suitable mannenprefe'rably by means of a screw 26,.Fig. 2, pro 9 vid'ed with a large flat head 27 adapted. to bear against the outer face of the saw. A ring28, squared or splined as indicated at 29 for non-rotatable fitting upon theend of the shaft 18, bears against the inner face of mo 7 the saw, and said saw is clamped between the ring 28 and the fiat head 27 of the screw 26 by means of screws or bolts 30. The saw is also preferably splined or squared to fit over the end of the shaft 29.

The saw 19 is enclosed by a guard comp ing an inner plate 31 and an outer plate 32 secured thereto, said outer plate having a central aperture 32 to give access to the screws 30. The upper portion of said guard is preferably rounded, as shown in Fig. 1, to conform to the contour of the saw, and its lower edge is squared or horizontal. inner plate 31 of the guard is mounted for vertical sliding movement upon the main frame casting 14:, and is provided with a slot 33 through which the saw shaft extends. The sliding connection between the guard plate 31 and the frame 1% is provided by inter-engaging vertical flanged 'uides 3% and 35, Fig. 3, secured respectively to said guard plate 31 and said frame let. A handle 36 is provided upon the forward edge of the guard, and a second handle 37 is attached to the frame 1 1.

The weight of the entire machine is balanced by the counterweight 11 within the standard 2, and the pivotal connections of the horizontal arms 6 and 12 permit the saw to be moved in a horizontal plane to any desired position over the block 1. In using the device, the operator lowers it until the saw comes in contact with the work, indicated at 38 in Fig. 1. The guard 3132 normally rests in its lowermost position upon the frame 1 1, and in such position its bottom edge is approximately even with the bottom of the saw. As the saw cuts through the work, the guard rests upon the upper surface of said work and rises upon said frame 14:. The collar 5 is so positioned upon the standard 2 that when the movable collar 3 is in con act with it, the saw is almost touching the :p surface of the block 1, thereby preventing the cutting of said block by the saw. The

- 'uard )lat s 3132 are positioned as close to the sides of the saw as possible.

A pair of vertically slidable rods are carried in guide brackets 10 upon the re face of the guard plate 31, and are adapted to drop by gravity on to the surface of the block 1 on either side of the work 38 in order to hold said work in position beneath the The upper ends of said rods 39 are provided with flanges, one of. which is shown at 11 in Fig.1, to prevent said rods from dropping out of their guides 40. Set screws 12, Figs 1 and 3, are provided in the guides 40 to the rods 39 in their elevated positions their use as work holders is not desired. r freely swinging plate 13, Fig. 1, is hung fron an arm 4-1- behind and in line with the saw t: prevent bone chips or dust from flving. The arm 4% is pivoted to the guard plate 31 at and a stop i6 is provided to limit i's down.- ward movement. The bottom of the guard 13 rests upon the top of the block 1 as the saw guard 3132 is lowered to position upon the top of the work.

The electric wires for supplying current to the motor 20 are led through the arms 6 and 12, which are made hollow to receive said wires. The wires preferably in the form of a cable indicated by the numeral 47 may be introduced into the arm 6 at any desired point, as shown in Fig. 1. At the swivel joint 13 between the two arms, and at the second swivel joint 13 between the arm 12 and the saw frame 14, I provide suitable electrical contacts, in order not to interfere with the movement of said joints. A preferred form of such contact arrangement is shown in Fig. 2, at the joint 13.

Contact rings -18 are mounted in a suitable insulating material 19 in the upper part of the frame 1 1, and are arranged concentrically about the pivot pin 15. Three such contact rings are shown adapted for three phase current. In the arm 12 are arranged three spring pressed contact brushes 50, mounted in a suitable insulating structure 51, and adapted to make sliding contact with the respective rin s 18. The brushes 50 are connected with the three wires of the cable l7, and the three rings 4C8 are connected by a cable led through the interior of the fram casting 1 1, and connected with one set of contacts of a switch indicated at 53. This switch, which may be of any suitable type, is mounted in a casing 5 1 projecting from the front face of the frame 1% and carrying the handle 37. The other contacts of said switch are connected with the motor 20.

The switch 53 is operated by a sliding bolt or button 55 extending up through the handle 37 and projecting from its upper end. spring 56 normally retains the bolt 55 in its uppermost position, thereby holding the switch 53 open. In order to close said s vitch to start the motor 20, the operator must depress the button 55, and must hold it depressed in order to keep the motor running. Therefore, if the operator removes his hand from the handle 37, the current is at once shut off, and the saw stops.

t will be seen that my device is not only sy and convenient to operate, but is safe as well. The automatic switch described above prevents the operation of the saw unless the operator has his hand on the handle 37. The saw guard 31-32 being slidable upon the saw frame 1 1 and resting upon the top of the work, encloses the saw adequately and eliminates any danger of contact therewith. The position of the motor 20 prevents any undue amount of turning force from being supplied to the saw casting 14, so that there is no danger of said casting twisting out of the operators grasp upon starting'the motor. The arrangement of the two handles 36 and 37, moreover, gives the operator complete control over the device. The slidable work holdand a driving connection between said motor ing rods 39 prevent the work from being shaft and said horizontal shaft.

kicked out by the action of the saw, even if In testimony whereof I have signed my small round bones are being cut. In working name to this specification.

on large pieces of meat whose weight would hold them down upon the block, the rods 39 may be held up out of the way by the set screws 42. The dust guard 43 prevents the flying of bone chips or dust. 1

The saw is easily cleaned by dipping it i into hot water and running the saw therein for a few seconds. The water maybe kept in any suitable vessel, not shown, placed beside the block 1 and at about the level thereof. The arrangement of the arms 6 and 12 and the sliding collar 3 enables the saw to be moved into any position upon the block, and the inclusion of roller bearings at all points of movement enables the positioning of the saw to be done with the least possible eflort. Finally, the saw can be removed for sharpening or replacement, without dismantling any other parts of the machine. The aperture 32 in the outer guard plate 32 permits the removal of the locking screws 30 and the clamping screw26-27, whereupon the saw can he slipped 01f the end of the shaft 18 and removed from the bottom of the guard.

I claim 1. A meat saw apparatus comprising a frame; a substantially horizontal shaft journaled therein; a saw carried by said shaft; and a pair of substantially vertically slidable work-holding members associated with said frame, one 011 each side of said shaft, and adapted to be lowered on either side of the work.

2. A meat saw apparatus comprising a supporting arm; a saw frame depending therefrom and rotatably mounted about a vertical pivot, said frame being vertically disposed and having greater width than thickness; a horizontal shaft journaled in the lower portion of said frame at right angles to the width thereof; a saw carried by said shaft on one side of said frame; a motor mounted upon the other side of said frame, said motor having a shaft inclined in a vertical plane parallel to said frame; and driving connections between said motor shaft and said horizontal shaft.

3. A meat saw apparatus comprising a supporting member; a saw frame depending therefrom and rotatablymounted about avertical pivot, said frame being vertically disposed and offset laterally from the center line of said pivot; a horizontal shaft journaled in said frame; asaw carried by said shaft on one side of said frame; a motor car- I ried upon the other side of said frame with its shaft inclined in a vertical plane parallel with said frame, the weight of said motor, said frame and said saw being approximately balanced about said pivot;

GEORGE F. FEISTER.

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