US2043398A

US2043398A - Shear

Info

Publication number: US2043398A
Application number: US8650A
Authority: US
Inventors: John A Smitmans
Original assignee: United Engineering and Foundry Co
Current assignee: United Engineering and Foundry Co
Priority date: 1935-02-28
Filing date: 1935-02-28
Publication date: 1936-06-09
Anticipated expiration: 1953-06-09

Description

.1; A. SMITMANSD SHEAR June 9, 1936.

s Sheets-Sheeti Filed Feb. 28, 1935 June 9, 1936. A, M TMA 2,043,398

SHEAR v Filed Feb. 28, 1955 5 Sheds-Sheet 2 V g I:

3 In I "3 7. Q: W J 5 J 155 E LL 2 I:

g a X WITNESSES 1 1 INVENTOR g I I BY myjz fi; ATTORNEYS,

June 9, 1936. J. A. SMITMANS SHEAR Filed Feb. 28, 1935 3 Sheets-Sheet 3 1i atente June 9, 1936 SHEAR John A. Smitmans, Pittsburgh, Pa., assignor to United Engineering & Foundry Company, Pittsburgh, Pa., a corporation of Pennsylvania Application February 28, 1935, Serial No. 8,650

10 Claims.

This invention relates to what is commonly referred to as a bloom shear and more particularly to a shear of this character of the up-cut typ Shears of this type are preferred to shears of the down-cut type because they avoid the necessity of using a downwardly adjustable or also accurately guiding them in their shearing 20 movements.

These and various other objectsv as well as the variousother novel features and advantages of the invention will be apparent when the following detailed description is read in conjunction 25 with the accompanying drawings of which Figs. 1 to 5 are a series of schematic views illustrating the cycle of operation of the cutting blades on a shear of the type contemplated by the invention; Fig. 6 a plane view; Fig. '7 a rear view;

30 and Fig. 8 a sectional view taken on the line VIII-VIII of Fig. 6 of a shear constructed in accordance with the invention.

In the operation of shears of this character as illustrated in Figs. 1 to 5 the billet or bloom 35 I is delivered to and from the shear by a fixed horizontal conveyor table 2. To receive the billet the blade heads 3 and 4 are normally maintained in their open position as shown in Fig. 1. When the billet is moved into position for shearing, the driving motor for the shear is set in motion. In the initial movement of the shear the upper blade head 3 is moved, as shown in Fig. 2, into contact with the upper side of the billet where it firmly holds the billet against the conveyor table and resists the upward movement of the billet as the lower blade head 4 is moved upwardly-through the billet which it is as shown in Figs. 3 and 4 by the further 50 operation of the shear motor. With the completion of the shearing operation, the two heads 3 and 4 are returned to their normally openor billet-receiving position illustrated again in Fig. 5

ready to perform a subsequent out. To permit 55 this operation the two blade heads are of course mounted, irrespective of their driving connections, to permit such relative movements.

According to this invention, as illustrated by the embodiment thereof shown in detail in Figs.

6 to 8 a shear of the character referred to is 5 provided which comprises a housing 5 in which there are arranged for guided vertical movement a lower blade head 6 and upper blade head I equipped with cooperating

cutting blades

8 and 9 respectively. In the lower of these blade heads 10 6 there is mounted a floating drive shaft ll, being secured thereto by a pair of journals l2 located at the ends of the head and held in place by suitable bolts to permit such parts being readily assembled and disassembled.

The upper blade head I is pivotally mounted on a carrying shaft I3 the ends of which are supported in a pair of connecting rods l4. The lower ends of these rods are mounted on a pair of eccentrics l5 which are keyed or otherwise secured to the floating drive shaft ll just outwardly of the journals II.

To hold the blade heads and their operating assembly in a normal position of rest in. the shear housing with the lower blade head slightly below the surface of a conveyor table l6 which is employed to conduct the billets into and out of the shear, a vertical rib I1 is provided in the rear mid-section of the lower head 6 and arranged to rest at its lower end on a shelf I8 provided for that purpose in the base of the housing. This rib I1 is also adapted to function as a guide for limiting the lateral movement of the lower head and prevent interference with the vertical movement of the latter head in the event the billet is not centrally located in the shear when the cut is made, being mounted to move in a vertical groove l9 formed in the inner face 20 of the shear housing. To prevent scale and other foreign matter getting into this groove 40 Ha roof-like inclined cover plate Ila is provided at the upper end of the rib l1.

To prevent any forward and rearward displacement of the upper blade head and thereby guide it as it is reciprocated, vertically disposed ribs II are provided at its twolateral sides, and arranged to move in grooves 22 formed for their reception in the inner side faces 23 of the housing uprights. For a like purpose and for also/ preventing spreading of the two blade heads when a cut is being made, a pair of vertically disposed guides orslides 24 is firmly secured to the sides of the lower blade head 6 at the upper end thereof and projected upwardly therefrom to move in a pair of grooves 25 provided for their reception in inner faces of the rearwardly projecting side portions 26 of the upper blade head and on the opposite sides to which the aforementioned guiding ribs 2| are formed just rearwardly of the grooves 23.

With such an arrangement, when the drive shaft II is first rotated, that is, when the upper blade head is in its upper position and-the lower blade head resting on the shelf iii, the eccentrics l5 and connecting rods i4 cause the upper blade head 1 to move downwardlyuntil it engages the billet. As soon as this occurs the billet is forced against the conveyor I 6 and upward movement of the billet is prevented. With the stopping of the downward movement of the upper blade head, the continued movement of the drive shaft i6 causes it itself to rotate about the centers of the eccentrics l5, and in doing so lifts the lower blade head 6 off the shelf I 8 and forces it upwardly through the billet to produce the out.

After the cut is made the continued rotation of the drive shaft ll causes the lower blade head 6 to move downwardly until the rib l1 engages the supporting shelf l8. This reinaugurates the rotation of the eccentrics l5 about the center of the drive shaft II and causes the upper head to be returned towards its upper position. As soon as it has reached such position the cycle of movement is completed and the further movement of the drive shaft stopped until the next cut is to be made. This stopping of the blade heads may be accomplished by any suitable means, such as a clutch or by stopping the driving motor, the details thereof not being shown, as such in themselves comprise no part of the invention,

To permit the above-described relative movement of the two blade heads and the drive shaft H to be operated without the driving or shearing forces, other than those involved in raising and lowering the upper blade head I, which are comparatively negligible, being imparted to the shear housing, the drive shaft is loosely mounted in the housing 5 and flexibly connected to its source of driving power. As shown its driving power is provided by a power unit 28 which is connected to it by an intermediate shaft 29 and a pair of flexible couplings 3| which are provided with suflicient play to afford all of the free movement in the drive shaft necessitated.

In addition to the foregoing features, to further facilitate the operation of the blade heads a pair of counterweights 32 is employed to counter-balance the weight of the upper blade head 1 and a similar weight 33 to counter-balance the weight of the lower blade head 6; As shown these weights are mounted on

levers

34 and 35 pivotally fulcrumed on a shaft 36 mounted in bearings 31 located just forwardly of the base of the housing 5, the inner ends of the levers 34 being pivotally connected by rods 38 to the lower ends of the side portions 26 of the upper blade head I and the corresponding end of the lever 35 pivotally connected by a rod 39 to lower'blade-head 1 epposite the lower end of the centrally disposed guiding rib l1.

According to the provisions of the patent statutes, I have explained the principle and mode of operation of my invention and have illustrated and described what I now consider to represent its best embodiment. However, I desire to have it understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.

I claim:

1. A shear comprising a supporting housing, an upper and a lower blade carrier equipped with cutting blades mounted for relative reciprocatory movement in said housing, a floating drive shaft rotatably secured to one of said carriers for reciprocating them both relative to each other, an eccentric on said shaft, means connecting said eccentric to said other carrier for actuating the latter through the rotation of said shaft, and means for actuating said blade carriers comprising a source of power connected by a flexible connection to said drive shaft.

2. A shear comprising a supporting housing, an upper and a lower blade carrier equipped with cutting blades mounted for relative reciprocatory movement in said housing, interfitting parts on said carriers and housing slidably engaging each other for guiding the movement of said carriers, a floating drive shaft rotatably secured to one of said carriers, an eccentric on said shaft, a rigid strut secured to said eccentric and pivotally connected to said other carrier for actuating the lat ter and adapting one carrier to carry the weight of the other, means on said housing for limiting the movement of one of said carriers, and means for actuating said shear comprising a source of power connected by a flexible connection to said drive shaft.

3. A shear comprising a supporting housing, an upper and a lower blade carrier equipped with cutting blades mounted for relative reciprocatory movement in said housing, interfitting parts on said carriers and housing slidably engaging each other for guiding the movement of said carriers, 9. floating drive shaft rotatably secured to said lower carrier, an eccentric on said shaft, a rigid strut secured to said eccentric and pivotally connected to said upper carrier for actuating the latter and transmitting its weight to the lower carrier, means on said housing for limiting the downward movement of said lower carrier, and means for actuating said shear comprising a source of power connected by a flexible connection to said drive shaft.

4. A shear comprising a supporting housing, an upper and a lower blade carrier equipped with cutting blades mounted for relative reciprocatory movement in said housing, interfltting parts on said carriers and housing slidably engaging each other for guiding the movement of said carriers, a floating drive shaft rotatably secured tdsaid lower carrier, a pair of eccentrics on said shaft adjacent the ends of said lower carrierfa rigid strut mounted on each of said eccentrics and pivotally secured to the two ends of said upper carrier for actuating the latter and transmitting its weight to the lower carrier, means on said housing for engaging and limiting the downward movement of said lower carrier, and means for actuating said drive shaft.

5. A shear comprising a supporting housing, an upper and a lower blade carrier equipped with cutting blades mounted for relative reciprocatory movement in said housing, interfitting parts on the sides of said carriers and housing slidably engaging each other for guiding the movement of said carriers, a rib provided on the rear face-of said lower carrier to move in a groove in the back of said housing to prevent tilting of the lower carrier, a floating drive shaft rotatably secured to said lower carrier, an eccentric on said shaft, a rigid strut secured to said eccentric and pivotally connected to said upper carrier for actuating the latter and transmitting its blade carriers.

7. A shear according to claim 1 provided with pivotally mounted levers pivotally secured at one end to each of said blade carriers and counterweights for counterbalancing the weights of said carriers secured to the opposite ends of said levers.

8. A shear according to claim 1 characterized by the floating drive shaft being connected to the source of power by an intermediary drive shaft and the two shafts joined together by a flexible connection which permits the intermediary shaftto follow the movement of the floating shaft. A

9. A shear comprising a frame, a top knife block mounted for free vertical movement in said frame, a bottom knife block mounted for vertical movement in said top knife block, a shaft mounted for rotation in said bottom knife block, an eccentric on said shaft, a link connection between said eccentric and said top knife block, and a driving motor connected by a flexible coupling to said shaft for actuating said shear.

10. A shear comprising a supporting housing, an upper and a lower blade carrier equipped with cutting blades mounted for relative reciprocatory movement in said housing, a floating drive shaft rotatably secured to one of said carriers, an eccentric on said shaft, means connecting said eccentric to said other carrier, and a power actuated floating torsional member operably connected to said shaft for actuating the shear.

JOHN A. SMITMANS.