US1814790A - Bar cutter - Google Patents

Description

July 14, 1931. R EDWARDS 1,814,790

BAR CUTTER Filed Dec. 22, 1930 2 Sheets-Sheet 1 1471mm jeioa Jul 14,1931. RAEDWARDS. 1,814,790

BAR CUTTER Filed Dec. 22, 1950 2 Sheets-Sheet 2 I; 5 i 22 1101 06" A? w iffjifowuy Patented July 14, 1931 STATES Units REID A. EDWARDS, F ALBERT LEA, MINNESOTA BAR CUTTER Application filed December 22, 1930. Serial No. 503,903.

My present invention relates to bar cutting shears and has for its object to increase the efficiency thereof by improving its construction and action. Said invention further provides such shears that can be manufactured at a relatively small cost and of such weight that they are easily handled and transported from one place to the other.

To the above end, generally stated, the invention consists of the novel devices and combination of devices hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a plan view of the bar cutter with the upper portion of the operating lever re moved;

Fig. 2 is a right side elevation of the bar cutter with some parts broken away;

Fig. 3 is a front end elevation of the bar cutter and diagrammatically illustrating by means of broken lines a bar to be cut thereby;

Fig. 41 is a view partly in right side elevation and partly in longitudinal vertical section taken on the line 4:4 of Fig. 1; and

Figs. 5 and 6 are views principally in transverse vertical sections taken on the lines 5 5 and 66, respectively, of Fig. 2.

The numeral 7 indicates a cast metal base or frame. A fixed cutting knife 8 is removably mounted on the frame 7 at the front end thereof and a cooperating relatively movable cutting knife 9 is detaohably secured to a heavy jaw 10 pivoted on a fixed horizontal nut-equipped bolt 11 intermediate of its ends to turn about the axis thereof. The bolt 11 is mounted at its end portions in aligned holes in a vertical tie-plate 12 and the frame 7. Said tie-plate 12 below the jaw 10 is rigidly secured to the frame 7 by three nut-equipped bolts 13 surrounded by short bosses on said frame against which the tie-plate 12 directly bears. A single bolt 14 connects the tieplate 12 above the aw 10 to the frame 7 and extends through aligned holes therein. The head of the bolt 14 impinges against the outer face of the tie-plate 12 and a pair of opposi g nuts 15 on the bolt 14.: impinge against opposite faces of the frame 7 and rigidly connect said bolt thereto.

A horizontal tie-bar 16 connects the pivot bolt 11 to a pivot bolt 17 for an operating lever, as will presently appear, and which bolt extends through aligned holes in the vertical sides of the bifurcated rear end portion of the frame 7. The tie-bar 16 is inter posed between the head of the bolt 11 and tieplate 12 and said bolt extends through a hole therein. The tie-bar16 at its rear end bears directly against a short square boss on the right side of the frame 7 and the bolt 17 extends through a hole in said bar with its head impinging against the outer face thereof.

Formed with the aw 10 is a rear lever extension 18 having on its rear end a segmental ratchet 19 the center of which is at the axis of the pivot bolt 11 and the teeth thereof are indicated by the numeral 20. It will be noted, by reference to Figs. 1, 4: and 5 that the lever extension 18 and ratchet 19 are entirely out of contact with the frame 7 and that only the jaw 10 has a working fit between said frame and tie-plate 12.

An adjustable abutment 21 for the lever extension 18 is provided to hold the upper knife 9 parallel to the lower knife 8 during cutting strains by preventing horizontal angular movement of the jaw 10 on the pivot bolt 11 or horizontal angular movement of said bolt in respect to the frame 7 under lateral force produced on said bolt by the jaw 10 during cutting action. This abutment 21 is on the frame 7 and the left-hand side of the lever extension 18 has direct contact therewith at all times. Said abutment 21, as shown, is in the form of a head on a screw 22 which extends transversely through the frame 7, has threaded engagement therewith and is operable from the left side of said 7 frame. A lock-nut 23 is applied to the screw 22. The left side of the lever extension 18 has rubbing contact with the abutment 21 substantially directly back of the pivot bolt 11 and holds said extension against lateral movement toward the frame 7 that would tend to permit an angular movement of the lwVeble knife 9 in re pest t9 the fee 199111 8 during cutting action. To keep the lever extension 18 in contact with the abutment 21 at all times the same is provided with a depending extension 24, see Fig. 2.

Cooperating with the ratchet teeth 20 and gravity-held in contact therewith is a driving pawl 25 loosely and pivotally mounted on the hub 26 of a socket member 27 for alever 28. The hub 26 is mounted on the pivot bolt 17 to turn about the axis thereof and the pawl 25 is eccentrically attached to said hub. Said hub 26 has a segmental bottom surface, concentric with the pivot bolt 17, which loosely rests in a correspondingly formed seat 29 on the frame 7 between the sides thereof, see Fig. 4. By thus mounting the hub 26 directly on the frame 7 all lifting strains are taken from the pivot bolt 17, during movement of the pawl 25 by the lever 28 to lift the rear end of the lever extension 18 by its engagement with one of the ratchet teeth 20 and thereby move the knife 9 toward the knife 8 to produce a cutting action.

Cooperating with the ratchet 19 is a dog 30 for holding the lever extension 18 when the pawl 25 is re racted to en age the next fol lowing tooth 20 during cutting action. The dog 30 is directly below the pawl 25 and is loosely pivoted on a fixed nut-equipped bolt 31 mounted in the sides of the frame 7, and the tie-bar 18. Formed with the right-hand side of the dog 30 intermediate of its ends is a laterally projecting headed stud 32- which works in a slot 33 in the right side of the frame 7. This stud 32 b T its en agement with the frame 7, at the rear end'of the slot 33, limits the movement of the dog to an in operative position away from the ratchet teeth 20.

It is important to note that the relative positions of the pawl 25 and dog 30 are such that when said dog is moved into an inoperative position it engages the pawl 25 and moves the same therewith into an inoperative posit-ion and thus holds the same as long its dog 30 is in an inoperative position.

A control for the lock dog 30 in the form of a bar 3% is pivoted at one end to the stud 32 between its head and the right side of the frame 7. On the pivoted end of the control bar 3% is a shoulder 35 arranged to engage the pivot bolt 31 as a stop and hold said bar against pivotal movement and in a forwardly inclined position indicated by broken lines in 4t. The weight of the control bar 34 when in its dotted line position holds the dog 30 in engagement with the engaged ratchet tooth 20. During the lifting movement of the ratchet 19 by the pawl 25 the dog 30 rides over said th and the weight of. the control bar 34 :eeps said dog tightly pressed against said teeth.

A lat-ch for holding the control bar 3-l with the lock dog 30 in its inoperative position neludes a transverse lock n0tch 36 formed-in said bar, intermediate of its ends, a short radial pin 37 on the socket member 27 on which the control bar 34 loosely rests with the pin 37 extending into the lock-notch 36, see Fig. 2. With the control bar 34 and socket member 27 connected it rearward movement of the lever 28 will release the dog 30 from the engaged ratchet tooth 20. This movement of the do 30 en 'a es the Jawl 25 and car-- ZD Z3 23 the dog 30 inoperative which, in turn, rests thereon under the action of gravity so that when said dog is released and returned to normal osition the pawl 25 will automatically ret r 0 normal or operative position.

The control bar also performs another important function, when holding the pawl and dog 30 inoperative, and that is it holds the lever in an upright position when the same is out of the way and can be conveniently reached when next operated to actuate the pawl 25.

The downward movement of the lever extension 18 is limited and positioned, with the lower end of its ratchet 19 above the floor and where the pawl 25 will engage the uppermost ratchet tooth 20, by a short laterally projecting stud 38 on the left-hand side of the ratchet 20 and arranged to engage the top of the frame 7, see Figs. 1 and 2.

The lever xtension 18 is provided with a handle 39 which extends parallel to the stud 38 and thereabove so that there is room for the hand between said handle and the frame 7. By means of the handle the lever extension 18 may be held and lowered when the pawl 25 and dog 30 are released from the ratchet 19.

The frame 7 and tie-plate 12 limits the lateral movement of a bar X, diagrammatically illustrated by broken lines in Fig. 3, between the knives 8 and 9.

During cutting action the bar X rests on the lower knife 8 and is held against tilting movement by avertically adjustable abutment 4:0 mounted on the frame 7 to overlie said bar.

Obviously, when the control bar 34 is connected to the socket member 27 by the latch 3637, see Fig. 2, the lever 28 is held thereby in an upright position on the opposite side of a dead center from the lock dog 30 where said lever is out of the way and may be easily reached and manipulated. When the lever 28 is thus held the pawl 25 and lock dog 30 are held thereby in inoperative positions.

To operate the jaw 10 and thereby produce cutting action by the knives 8 and 9, the lever 28 is oscillated to actuate the pawl 25 and thereby cause the same to successively engage the ratchet teeth and lift the lever extension 18. During the lifting movement of the lever extension 18 by the pawl the dog is gravity-held for action on the ratchet teeth 20 and holds said lever extension while the pawl 25 is being moved to engage the next following ratchet tooth 20.

To more positively move the gravity-held lock dog 80 for action on the ratchet teeth 20 the control bar 34: is swung forward into its dotted line position, see Fig. 4, and in which position its shoulder 35 is in engagement with the stud 31 and holds said bar against further pivotal movement beyond a dead center on the same side with the lock dog 30. In this position of the control bar 84 the weight thereof produces a yielding lever action on the lock dog 30 toward the I ratchet teeth 20.

From the above description it is evident that the pawl 25 and lock dog 30 are operated and controlled without the use of springs; that very little machine work on the device is required during its manufacture; that said device is of relatively light-weight so that the same may be easily handled and transported from one place to the other; and that the device is easily and convenient to operate.

What I claim is:

1. In a device of the class described, a

frame, a jaw pivoted to the frame, cooperating cutting knives on the frame and jaw, means for operating the jaw to produce cutting action including ratchet teeth and a cooperating lever-actuated pawl, a lock dog,

and a control for the lock dog constructed and arranged when set in one position to yieldingly hold the lock dog for action on the ratchet teeth and when set in another position to hold the lock dog inoperative, said pawl being under strain to move into operative relation. with the ratchet teeth, the relative arrangement of the pawl and lock dog being such that the lock dog when moved to an inoperative position automatically moves the pawl into a like position and thus holds the same.

2. In a device of the class described, a frame, a jaw pivoted to the frame, cooperating cutting knives on the frame and jaw,

in means for operating the jaw to produce cutting action including ratchet teeth and a cooperating lever-actuated pawl, a pivoted lock dog, a control bar pivoted to the lock dog for swinging movement in the direction of its pivotal movement, and a latch for securing the control bar in a position in which it holds the lock dog inoperative, said control bar being movable into another position in which it engages a relatively fixed stop and produces a lever-like action on the look dog to yieldingly hold the same under the fiction of gravity for action on the ratchet teet 3. In a device of the class described, a frame, and a jaw pivoted to the frame, cooperating knives on the frame and jaw, means for operating the aw to produce cutting action including ratchet teeth, an operating lever fulcrumed on the frame and a pawl pivoted to the lever eccentric to its fulcrum for movement to and from action on the ratchet teeth, a lock dog pivoted to the frame for movement to and from action on the ratchet teeth, stop means for limiting the movement of the lock dog away from the ratchet teeth, a control bar pivoted to the lock dog for swinging movement in the direction of its swinging movement, and a latch for connecting the control bar to the lever, said lever when connected to the control bar by the latch being held thereby in an upright position on the opposite side of a dead center from the lock dog, whereby the tendency of the lever to swing away from the lock dog under the action of gravity holds the lock dog in an inoperative position against said stop means.

at. The structure defined in claim 3 which the control bar is movable about the axis of its pivot into engagement with a relatively fixed stop which positions said bar on the same side of a dead center with the lock dog and in which it produces a leverlike action on thelock dog to yieldingly hold the same for action on the ratchet teeth.

5. The structure defined in claim 3 in which the pawl is between the lever and lock dog, said lock dog being constructed and arranged when moved by the lever into an inoperative position to engage the pawl and move the same therewith into a like position.

6. The structure defined in claim 3 in which the pawl is between the lever and lock dog, said lock dog being constructed and arranged when moved by the lever into an inoperative position to engage the pawl and move the same therewith into a like position, said pawl being constructed and arranged to move by gravity into action on the ratchet teeth when the lock dog is moved into a like position.

7. In a device of the class described comprising a frame, a pivoted jaw on the frame having a lever extension, operating means for oscillating the lever extension, cooperating cutting knives on the frame and aw, and an adjustable abutment on the frame with which the lever extension has rubbing contact during oscillatory movement to hold the same and prevent angular movement of the cutting knife on the jaw in respect to the cutting knife on the frame during cutting action.

In testimony whereof I alfix my si nature.

REID A. EDWA .DS.

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