US1714455A

US1714455A - Shear

Info

Publication number: US1714455A
Authority: US
Inventors: Jesse C Scoggins
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-04-28
Filing date: 1926-04-28
Publication date: 1929-05-21
Anticipated expiration: 1946-05-21

Description

May 21, 1929.

J. c. SCOGGINS 1,714,455

SHEAR Original Filed April 28, 1926 Patented May 21, 1929.

UNITED STATES JESSE oscoeoms, or LOS Antennas, CALIFORNIA.

' SHEAR.

Application filed April 28, 1926, Serial No. 105,110. Renewed December 22, 1928.

This invention relates to improvements in shear, and is particularly an improvement over the shear disclosed in my prior Patent No. 1,102,173 issued June 30, 1914.

6 An object of this invention is to provide an improved shear in which there is an adjustable connection between the actuating lever and the movable blade, permitting a considerable movement of the blade and 10 causingthe shear to cut with a minimum amount of efiort or exertion. v

Another object of this invention 15130 provide a shear on which thereis a novel hold-down bar, which can be easily and 15 quickly adjusted to hold an article in position between the blades while it is being out.

A further object of. this invention is to provide an improved shear wherein the holddown bar can be longitudinally adjusted and be caused to present a guide surface enabling articles to be cut obliquely or at angles at 45 deg. of their length. j A still further object of this invention is to provide an improved shear wherein the frame is quite ruggedly constructedso as to materially lengthen the life or utility of the device. j 7,

'With the foregoingfand other objects in view which will be made manifest in the following detailed description and specifically pointed out in .the appended claims, reference is hadto the accompanying drawings for an illustrative embodiment of the invention, wherein:

Figure 1 is a side elevation of the improved shear, parts being broken away and shown in section, n

Fig. 2 is a front view in elevation of the shear, and I Fig. 3 is a top plan view of the shear.

Referring to the accompanying drawings wherein similar reference characters deslg nate similar parts throughout, the improved shear consists of a frame which is vertically slotted or bifurcated, providing two spaced forward uprights and two spaced rear.- ward upright-s 11. These uprights are connected at their upper ends by means of cross bars 12 and have their lower ends joined to a base 13, whichis provided with apertured attaching lugs 14 so that the device can be rigidly'secured to a work bench orthe like. On the base 13 there is removably secured a stationary blade 15 which is fastened as by bolts 16.' A movable blade 17 carries a removable cutter 18andis'pivoted upon a bolt '19 extending between the forward uprights 10. On the'rear end of the movable blade 17 there is pivotally fastened alink 20 which is pivoted as at 21 and which is also pivoted as at 22 to aquadrant shaped member 23, which corresponds to the angularlever provided uponmy prior construcion. 1

Between the upper ends of the forward uprights 10 there is pivotally mounted an actuating lever '24 pivoted as at 25, and which has pivotally secured thereto links 26. Between the rearward ends of the links 26 there is disposed a connecting pin 27 which 1s receivable-in any one of the notches 28 formed upon the top of the quadrant shaped member-23. The notches 28 are wider at their bottoms than at their tops, so that the pin 27 will'not slip out of any'notch regardless of the direction in which the quadrant shaped member 23 is moved. A yoke 29 projects laterally from the side .of one of the forward uprights 10, and ahold-down bar 30 extends therethrough. The rear end of the hold-down bar 30 is providedwith an arcuate slot 31', through which extends a stud 32 which is slidable therein, and which is provided with a washer 33 and a cotter pin 34. Any other suitable fastening means can be employedfif desired. A- wedge 35 rests upon the top of the hold-down bar 30 36 which embrace the sides of the hold-down bar. The forward movement of the wedge 35 is limited by the engagement'between the fingers 36 and the yoke 29. While the rearward movement of the wedge when the holddown bar is in its lowermost position may be limited by the upstanding finger 37,

and has on its rear end depending fingers sume its rearmost position permitted by the slot 81, the bevel 39 on the forward end of the hold-down bar is on a line passing through the forward end of the stationary blade 15.

Theoperation of the shear is as follows: In cut-ting straight material, the hold-down bar is caused to assume its foremost po-' sition, and the material is caused to rest on the stationary blade 15. The hold-down bar is positioned on top of the material and the wedge is forced rearwardly, so that the hold-down bar will hold the material against the blade. The actuating lever 24 is then pulled forwardly, swinging the quadrant shaped member and causing the movable blade 17 to start cutting. In such position the pin 27 frequently occupies one of the notches 28 at the forward end of the quad rant shaped member 23. Because of the link arrangement the lever 24 will be pulled forwardly a considerable distance, while the blade 18 cuts but a short distance; Consequently, the device assumes a position where in the pivotal connection between the links 26 and the actuatinglever will not maintain a maximum mechanical'advantage. The pin 27 and the pivotal connection 22 approach the same straight line, so that the mechani cal advantage of the machine decreases. Consequently, in order to maintain the maximum mechanical advantage, the pin 27 is lifted outvof one of the foremost notches and slipped into'one of the rear notches, so that the links 27 will be kept more in a position wherein they are at right angles to the line joining the pin 27 and the pivotal connection 22. WVhen. the pin 27 is slipped into the rear notches, the lever 24 is'again swung forwardly to complete the out.

The machine is very advantageously used in cutting articles, especially angle irons on a deg. bevel. In such position the .holddown bar is forced into its rearmost position, and the angle iron is applied as shown in Fig. 3' with the upright web bearing against the forward face 89 of the hold-down bar, and the horizontal web bearing againstthe under side of the flange 38. The holddown bar therefore forms a guide for holding the angle iron at 4-5 deg. to the cutting edges on the

blades

15 and 18, and on operating the shear, the angle iron will have one of its webs out in that manner. It will be noted that the wedge 35 is operable to hold the material against the blade 15 in either of the positions of the hold-down bar.

From the above described construction it will be readily appreciated that the improved shear has several advantages over the construction disclosed in my prior patent in ease of operation and in holding articles to be cut.

It will be understood that various changes may be made in the detail of construction without departing from the spirit or scope of the invention as defined by the appended claims.

I claim:

1. A shear comprising a frame, a stationary blade thereon, a movable blade positioned upon the frame, a quadrant shaped member pivoted to the frame above the rear end of the movable blade, a link pivotally connected to the rear end of said movable blade and to said quadrant shaped member, an actuating lever pivoted to the forward upper portion of the frame, and a link piv oted to said actuating member, said link carrying a pin receivable in any one of several notches formed upon said quadrant shaped member, the entrances to the notches being narrower than their bottoms.

2. A shear comprising a frame, a stationmy blade thereon, a movable blade pivoted upon the frame, a quadrant shaped member pivoted to the frame above the rear end of the movable blade, a link pivotally connected to; the rear end of said movable blade and to said quadrant shaped member, an actuating lever pivoted to the forward upper portion of the frame, and a link pivoted to said actuating lever, said link carrying a pin receivable in any one of several notches formed upon said quadrant shaped member whereby the mechanical advantage of the shear may always be maintained at a mXimum.

3. In a shear, a frame, a stationary blade thereon, a movable blade mounted on the frame, means for moving said movable blade relatively to said stationary blade, a

yoke mounted upon the side of the frame,

a hold-down bar vertically movable in said yoke, and wedge means for holding said hold-down bar against an article placed be tween said blades.

4. In a shear, a frame, a stationary blade thereon, a movable blade mounted on the frame, means for moving said movable blade relatively to said stationary blade, a yoke mounted upon the side of the frame, a hold-down bar pivoted to the frame and extending forwardly through said yoke so as to be vertically movable therein, and a wedge slidable between the top of said holddown bar and the top of said yoke.

5. In a shear, a frame, a stationaryblade thereon, a movable blade mounted on the frame, means for moving said movable blade relatively to said stationary blade, a yoke mounted upon the side of the frame, a hold-downbar pivoted to the frame and eX- tending forwardly through said yoke so as to be vertically movable therein, and a wedge H slidable between the top of said hold-down bar and the top of said yoke, said wedge having, depending fingers embracing the sides of the hold-down bar. 7 V Y 6. In a shear, a frame, a stationary blade thereon, a movable blade mounted on the frame, means for moving said movable blade relatively to said stationary blade, a yoke mounted upon the side of the frame, a holddown bar movable vertically Within said 5 yoke and forwardly and backwardly therein,

means for holding said hold-down bar in adjusted position, said hold-down bar having its forward end beveled off so that when the hold-down bar is in its rearmost position, its. beveled end will be upon a" line extending 10 through the forward end of the stationary blade of the shear.

In testimony whereof, I have signed my name to this specification.

JESSE G. SCOGGINS.