US2823812A

US2823812A - Shock absorbers for billets

Info

Publication number: US2823812A
Application number: US443757A
Authority: US
Inventors: Clarence E Mccoy
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1954-07-16
Filing date: 1954-07-16
Publication date: 1958-02-18
Anticipated expiration: 1975-02-18

Description

Feb. 18, 1958 c. E. MCCOY 2,823,812

SHOCK ABSORBERS FOR BILLETS I Filed July 16, 1954 Q 32 INVENTORS:

' C. E. MCCOY BY m ATTORNEY United States Patent SHOCK ABSORBERS FOR BILLETS Clarence E. McCoy, Clarendon Hills, Ill., assignor to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application July 16, 1954, Serial No. 443,757

6 Claims. (Cl. 214-18) This invention relates to shock absorbers for billets, and more particularly to shock absorbers for billet rolling mills for absorbing energy required to stop billets.

In rolling mills and furnaces for heating billets preparatory to conveying the billets to the mills, shock absorbers have been provided for stopping the billets as they are slid out of the furnace onto a conveyor to lessen the impact of the billets on the apparatus. Shock absorbers which have been sufiiciently strong to suitably avoid shock to the apparatus have also been sufliciently strong to occasionally push billets stopped thereby back off the conveyor which is to convey the billets away to the mill and slows the operation of the mill and requires operators attention.

An object of the invention is to provide new and improved shock absorbers for billets.

Another object of the invention is to provide shock absorbers for stopping billets in rolling mills and for absorbing the energy utilized in stopping the billets.

A further object of the invention is to provide shock absorbers which are sufficiently strong as to prevent shock to associated apparatus and to effectively stop billets thrown thereagainst while absorbing the energy of the impact of the billet without throwing the billet therefrom in recoil.

A shock absorber illustrating certain features of the invention may include a slidably mounted stop positioned at a conveyor adjacent to the outlet of a furnace for heating billets against which the billets strike as they slide out of the furnace. Resilient means composed of a memory-type plastic are provided to permit the stop to be moved by a billet crashing thereagainst, the material being sufiiciently strong to return the stop to its initial position sufliciently slowly that the billet is not thrown off the conveyor.

A complete understanding of the invention may be obtained from the following detailed description of a shock absorber forming a specific embodiment thereof, when read in conjunction with the appended drawings, in which Fig. 1 is a fragmentary vertical section of a shock absorber forming one embodiment of the invention, and

Fig. 2 is a horizontal section taken along the line 2-2 of Fig. 2.

Referring now in detail to the drawings, there is shown therein a furnace for heating billets 11 to a rolling temperature, and for discharging the billets one at a time down a chute 12 onto a roller conveyor 13 conveying the billet from the furnace. The chute 12 is sufliciently sloping that each billet travels completely onto the conveyor 13, and this causes the billets 11 to attain considerable speed in sliding down. To stop each billet without shock to the furnace, there is provided a channel stop 16 carried on frames 17 hung by slidable bearings on ways 18 having stops 19 at the ends thereof. The frames 17 are fixed rigidly to rods 21 mounted slidably in bores 22 in fixed columns 23, and nuts 24 adjustably 2,823,812 Patented Feb. 18, 1958 threaded on the rods 21 hold bushings 25 on the rods 21 between the nuts 24 and washers 26 and bottom flanges 27 of heat shields 28.

Rods 31 having hooks 32 thereon hooking over the channel stop 16 are mounted loosely in bearings 35 carried by columns 36, and nuts 37 threaded on the ends of the rods 31 secure bushings 38 between the bearings 35 and washers 39. The

bushings

25 and 38 are composed of a butyl rubber compound which will dissipate energy on impact without exerting a high resilient force. An example of such a compound contains grade 1 butyl rubber 62.50%, stearic acid 0.66%, petrolatum 0.66%, zinc oxide 3.50%, Micromex 20.80%, Pelletex 9.58%, sulfur 1.30%, Captax 0.34% and Methyle: Tuads 0.66%.

As each billet 11 slides down the chute 12 onto the conveyor 13, it strikes the stop 16 hard and moves the channel, the

rods

21 and 31 and the frame 17 toward the right, as viewed in Fig. l, compressing the

bushings

25 and 38 as the

rods

21 and 31 are so moved. The

bushings

25 and 38 are suihciently elastic as to resist the movement of the

rods

21 and 31 with sufficient force as to prevent the frame 17 from striking the stop 19 hard, and the butyl rubber composition of the

bushings

25 and 38 is sufliciently weak that they do not exert sufficient force to pull the channel 16 back toward the left with such force as to throw the billet off the conveyor 13.

The above-described shock absorber prevents battering of the furnace and conveyor, and does: not throw the billets back oif the conveyor 13 as it returns the channel relatively slowly to its initial position.

It is to be understood that the above-described arrangements are simply illustrative of the application of the principles of the invention. Numerous other arrangements may be readily devised by those skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is:

1. in a rolling mill including a furnace having an inclined chute and a roll conveyor extending transversely of the inclined chute for conveying billets from the furnace supplied thereto by the chute, the improvement which comprises a bumper plate, a slide extending transversely of the conveyor and supporting the bumper plate in a position parallel to the conveyor, a slidably mounted rod secured rigidly to the slide, a second slidably mounted rod secured to the bumper plate, a plurality of butyl rubber bushings mounted on the rods, and means for restraining movement of the bushings with the bumper plate as a billet strikes the bumper plate and moves the rods, said bushings being insufficiently resilient to return the bumper plate rapidly to its normal position while the billet is thereagainst.

2. In a rolling mill including a furnace having an inclined chute and a roll conveyor extending transversely of the inclined chute for conveying billets from the furnace supplied thereto by the chute, the improvement which comprises a bumper plate, a slide: extending transversely of the conveyor and supporting the bumper plate in a position generally parallel to the conveyor, a plurality of slidably mounted rods secured to the slide, a plurality of butyl rubber bushings mounted on the rods, and means for restraining movement of the bushings with the bumper plate as a billet strikes the bumper plate.

3. in a rolling mill including a furnace having an inclined chute and a roll conveyor extending transversely of the inclined chute for conveying billets from the furnace supplied thereto by the chute, the improvement which comprises a bumper plate, a slide extending transversely of the conveyor and supporting the bumper plate in a position parallel to the conveyor, a plurality of pull rods secured to the slide, means mounting the rods slidably. on the furnace, a plurality of butyl rubber bushings mounted on the rods, and means for restraining movement of the bushings with the bumper plate as a billet strikes the bumper plate and pulls the rods, said bushings being insufficiently resilient to return the bumper plate rapidly to its normal position while the billet is thereagainst.

4. In an apparatus including a furnace, a conveyor extending away from the furnace and a chute extending from the interior of the furnace downwardly to the conveyor and transversely of the conveyor for delivering billets from the furnace to the conveyor, the improvement comprising a guideway extending across the conveyor, a slide mounted on the guideway, a bumper plate secured rigidly to the slide and depending substantially to the conveyor, a plurality of rods extending parallel to the slide, a plurality of butyl rubber bushings mounted on the rods, fixed means for restraining movement of the bushings with the rods when the stop plate is struck by a billet coming from the chute onto the conveyor, 21 plurality of 'rods'having hooks on the ends thereof engaging the bottom of the stop plate at spaced points therealong, a plurality of butyl rubber bushings mounted on the hooked rods, and fixed stop means preventing travel of the last-mentioned butyl rubber bushings with the hooked rods when the stop plate is moved by a billet striking it.

5. In an apparatus including a furnace, a conveyor extending away from the furnace and a chute extending from the interior of the furnace downwardly to the conveyor transversely of the conveyor for delivering billets from the furnace to the conveyor, the improvement comprisinga pair of ways above the conveyor and extending across the conveyor, a slide mounted on the ways, a bumper plate secured rigidly to the slide and depending substantially to the conveyor, a plurality of rods extending parallel to the slide and secured thereto, a plurality of butyl rubber bushings mounted on the rods, fixed means for restraining movement of the bushings with the rods when the stop plate is struck by a billet coming from the chute onto the conveyor, a plurality of rods having hooks on the ends thereof engaging the bottom of the stop plate at spaced points therealong, a plurality of butyl rubber bushings mounted on the hooked rods, and fixed stop means preventing travel of the last-mentioned butyl rubber bushings with the hooked rods when the stop plate is moved by a plate striking it.

6. A shock absorber for stopping an object moving along a predetermined path comprising a frame, a plurality of rods slidably mounted in the frame to extend from both sides thereof, a plate mounted on the ends of the rods extending in a first direction beyond the frame and positioned in the path of movement of the object, a plurality of butyl rubber bushings mounted on those portions of the rods extending in the opposite direction from the frame, and retaining means mounted on the ends of the rods extending in said opposite direction for holding the bushings on said rods.

References Cited in the file of this patent UNITED STATES PATENTS 2,515,675 Tree July 18, 1950