US1567078A - Bevel shears - Google Patents

Description

Dec H. PENNINGTON BEVEL SHEARS Filed August 4Q 1923 2 Sheets-Sheet l I 0% gt-:mm3 fm] ha.' 2 ,7.1.7z5. 1,567,078

' H. D. PENNINGTON y BEVEL SHEARS Filed August 4, 1923 2 Sheets-Shee'I 2 36 30" l 32 m Z7 'l [l [l I m T Patented Dec. 29, QZ.

S'TE

han

raraur orifice.

HARLEY D. PENNINGTON, OF PTTSBURGH, ENNSYLVANIA, ASSIGNOR TO UNITED ENGNEERING @s FOUNDRY CCMPANY, 01E' PITTSBURGH, PENNSYLVANIA, A COR- PORATION 0F PENNSYLVANIA.

BEVEL SHEARS.

Application filed August 4, 1523.

To all `1li/zout t may concern.'

Be it known that l, HARLEY D. PnNNINoson, a citizen ot the United States, residing at Vlittsburgh, in the county of Allegheny and State ot Pennsylvania, have invented a new and useful Improvement in Bevel Shears, ot which the following is a full, clear, and exact description.

The present invention relates broadly to metal cutting and more particularly to shears of the general character known inthe art as bevel shears adapted to cut strips, rods, bars or the like, hereinafter broadly reterred to as stock at an angle.

l-leretotore in the art it has been customary to utilize shears ot the lever type and to niount the saine on an inclined base, the inclination of the base being such that the proper angle of cut is insured. Such shears usually have a complicated and cumbersome gearing arrangement, and are somewhat unwieldly. Also, due to the rake of the shears there is an objectionable tendency for the material being sheared to niove sidewise. By the present invention there is provided an improved shear of compact form adapted to stand erect on its base, and having a shear blade so operated and constructed that there is no tendency for the material being sheared to more sidewise.

rlhe present invention also has for its object the provision oiimproved gauge or stop means tor determining' the lengths of material to he sh ed, together with means preventing jumping or Ythe body of the stock troni which the lengths are sheared.

ln the accompanying' drawings there is shown tor purposes of illustration only one embodiment ot the present invention, it being understood that the drawings do not deiiue the limits ot' the invention, as changes in the operation and construction therein ldisclosed may obviously be made without departing from the spirit of the invention or scope ot in v broader claims.

in the drawings:

Figure 1 is a side elevation of a bevel shear embodying the present invention;

Figure 2 is an end elevation, with a portion ot the housing removed and partly in section, ot the shear shown in Figure 1; and

Figure 3 is a detail view, partly broken away, of a portion of the gauge.

In carrying out the present invention Serial No. 655,689.

there may he provided a substantially upright traine or housing 2 of suitable construction having extending longitudinally of the upper portion thereof a main shat't 3. This shaft may be driven in any usual manner .troni a motor 4 through a suitable train ot gearing, including a clutch 5. F or oper ating the clutch to establish operative driving connection at will between the motor and the shaft, there may be provided a suitable mechanism such as a toot lever 6.

The 'front end of the housing 2 is constructed to provide an enlarged enclosing casing 7. The portion of the shaft 3 pro@ iecting into the casing is oiiset to form a crank El adapted during rotation ot the shaft to reciprocate a pitman 9. The lower end ot the pitinan preferably oi' generally cylindrical outline, whereby it is adapted to cooperate with a suitable bearing 10 in shear blade 11. rlhis shear blade is in turn mounted tor oscillatory movement about a short shaft 12, having its axis extending substantially parallel to the axis of the shaft 3 and at substantially right angles to the direction oi." travel of the stock to be sheared. Operative driving connection between the blade 11 and the pitman 9 may be maintained by providing' a retaining guard 13.

The blade 11 is entirely or partly counter" balanced by a suitable spring 14 with which cooperates a Jfollower 15 carried by a link 16 operatively secured to the blade. The spring is preferably of such scale as to insure the return ol the blade 11 to its upper position, as shown in Figure 2. By reason ot this construction it will be apparent that as the shait 3 is rotated the pitnian 9 will be operated to alternately raise and lower the upper blade 11. During its downward movement, the blade cooperates with a lower blade 17, carried by the housing 2, whereby any stock S projecting; there beyond is shear-ed at. an angle While the lower edge ot the blade 1l moves through a substantially arcuate path during the shearing operation, it has been found that the degree of curvature is so little as not to be objectionable. The movement of the upper blade is such that there is no tendency for the stock being sheared to move sidewise during the shearing operation. For this reason the stock may initiallyv he fed across a table 18 in the desired position llt) lill) lllf) against a stop 19. This shearing operation, however, has a tendency to cause the body of the stock from which the length of material is being sheared to jump. In order to prevent this objectionable jumping of the stock, I have provided a clamp 2O havinga pivotal 'connection 2l with the shear housing and operatively connected by means of a link 22 to a. projection 23 on the upper blade ll. Formed in the projection 23 is an opening 2e having enlarged ends adapted to permit the oscillatory movement of the blade without bending the link Surrounding the link is a compression spring cooperating at its lower end with a washer 26 held against move. yrent on the link and at its upper end with a similar washer resting against the lower surface of the projection 23. During the operation of the shear, the downward movement of the blade will be effective through the spring for forcing the free end of the clampl 2O into engagement with the stock. Thereafter, continued downward movement of the blade will result in 'further compression of the spring without any corresponding movement of the clamp 20. Y

It is desirable with shears of this general nature to provide a stop or gauge for indieating quickly the proper lengths of material being sheared. In accordance with the present invention there may be provided a gauge for this purpose comprising a pair of spaced bars 27 carried at their inner ends by links 28 pivotally mounted on the shaft 12. At their outer ends the bars 27 ycooperate with supporting links 29 depending from a sleeve 30 carried by a pin 31. The pin in turn may be supported by laterally extending links 32 and tension members 38. Formed in the lower ends of the links 29 are elongated openings 34 adapted to provide a lost motion connection with the bars 27. Carried by the bars 2? is stop 35 adapted to be adjusted longitudinally thereon and clamped in position oy bolts 36. rthe stop may comprise relatively movable members, the position of which may be accurately controlled by means of screws 37. These screws enable the parts to be initially set to insure the shearing of proper lengths from the stock.

As the shearing operation occurs, there is a tendency for the piece being sheared to move longitudinally, due to the angularity of the cut. In order to permit this movement while maintaining the material in contact refigors with the stop 35, the inner ends of the bars 27 are so mounted that they are engaged by the shear blade 1n its downward movement and forced downwardly, the short shaft l2 Further advantages arise from the pro- H vision of a bevel shear having no rake and operated in such manner that the desired cutting operation is performed without a sidewise movement of the material being sheared or any jumping of the stock.

I claim:

l. In a bevel shear, a substantially upright housing having a horizontal work supporting table, an oblique stationary lower shear blade at one end of said table, an operating shaft arranged above and transversely of said table, an upper shear blade for cooperation with said lower blade, a carrier for said upper blade mounted to oscillate about an axis'parallel to said operating shaft, means operatively connecting said upper blade with said operating shaft, clamping means for holding the work on said table during the shearing operation, and yielding means operatively connect-ing said upper blade carrier with said clamping means, substantially as described.

2. In a bevel shear, a substantially upright housing having a horizontal work supporting table, an oblique stationary lower shear blade at one end ofsaid table, an operating shaft arranged above and transversely of said table, an upper shear blade for cooperation with said lower blade, a carrier for said upper blade'mounted to oscillate about an axis vparallel to said operating shaft, means operatively connecting said upper blade with said 'operating shaft, a stop for gauging the length of material to be sheared, and a movable support for said stop ar ranged to be engaged by the upper blade carrier during the shearing operation for moving said stop away from the lower blade,

lsubstantially as described.

Y HARLEY l). PENNINGTON.

Images