US3918691A

US3918691A - Recoil system for furnace charger

Info

Publication number: US3918691A
Application number: US473332A
Authority: US
Inventors: Robert C Overmyer
Original assignee: Hawley Manufacturing Corp
Current assignee: Hawley Manufacturing Corp
Priority date: 1974-05-28
Filing date: 1974-05-28
Publication date: 1975-11-11
Anticipated expiration: 1992-11-11

Abstract

A fumes controlling hood for a melting furnace, the hood being constructed and arranged to rest on the furnace top to envelop the upwardly-opening furnace mouth and to open or close a lateral entry to the interior of the hood, a part of the hood roof opposite such entry being slidable toward and away from the entry and providing an abutment conforming to a portion of a charging bucket admissible into the hood through the entry, and a spring arrangement for yieldably resisting movement of such hood roof part away from the entry.

Description

7 United States Patent 1191 1111 3,918,691 Overmyer [4 Nov. 11, 1975 [5 RECOIL SYSTEM FOR FURNACE 2.908.737 /1959 DOmllliCiS 266/3] )1 CHARGER 3.415.179 12/1968 SChCCi 3.756.582 9/1973 Overmyer et a1. 266/15 [75] Inventor: Robert C. Overmyer, Indianapolis.

Primary Evanliner-Granville Y. Custer. Jr. [73] A i H l M f t i Corporationq Assistant Evcuniner-Paull A. Bell Indianapolis, Alto/716). Agent. 01' Firm-William R. Coffey 77 Filed. May 28, 1974 [57] ABSTRACT PP 473332 A fumes controlling hood for a melting furnace. the hood being constructed and arranged to rest on the 52 s C] 266/16; 98/1 15 214/18 SC furnace top to envelop the upwardly-opening furnace [51] Int. Cl. C2lC 5/40 mouth and to Open or Close lateral entry to the 158 Field Of Search 98/115 R: 141/284. 326: "fthehwd roof Opposite Such 214 R 18 v 18 266/15, 16 33 R, 33 entry being slidable toward and away from the entry 5 and providing an abutment conforming to a portion of a charging bucket admissible into the hood through [56] References Cited the entry. and a spring arrangement for yieldably re- UNITED STATES PATENTS sisting movement of such hood roof part away from the entrv. 2.268.918 1/1942 Allan et al. 266/15 2.377.597 6/1945 Wilson et al 266/16 2 Chums. 4 Drawlng Figures 5| y! II i l 1 1 I,/ 54 i /22 x 1 l 1 I l9 5 2 US. Patent Nov. 11, 1975 Sheet 1 of2 3,918,691

US. Patent Nov. 11, 1975 Sheet 2 of2 3,918,691

RECOIL SYSTEM FOR-FURNACE CHARGER The present invention relates to an improvement in furnace hoods generally of the character disclosed in US. Pat. No. 3,756,582 issued Sept. 4, 1973. The prie mary object of the invention isto provide a resilient bumper or recoil system in the roof of such a hood and opposite a lateral opening constructed and designed to permit lateral entry of a charging bucket to the interior of the hood and to a position in registry with the upwardly-opening mouth of the furnace, the recoil system being designed to absorb any lateral momentum of the bucket and to return the bucket, after any over-ride of the furnace mouth, to accurate registry with that mouth. A further object of the invention is to provide novel means for the above purpose, including a sliding roof section carrying a depending skirt for conforming engagement by the bucket, said skirt carrying pad means on its outer surface for engagement with bumper pins within the hood and provided with spring means resisting outward movement of the bumper pins.

Further objects of the invention will appear as the description proceeds.

To the accomplishment of theabove and related objects, my invention may be embodied in the form illustrated in the accompanying drawings, attention being called to the fact, however, that the drawings are illustrative only, and that change may be made in the specific construction illustrated and described, so long as the scope of the appended claims is not violated.

In the drawings:

FIG. 1 is a plan view of a hood constructed in accordance with the present invention, parts being broken away for clarity of illustration;

FIG. 2 is a transverse section of a subframe carrying the bumper pins;

FIG. 3 is a fragmental section taken on the line 33 of FIG. 2; and

FIG. 4 is a reduced section illustrating the association of the hood with the furnace mouth and showing a charging bucket in its position assumed when the bumper pins have been driven back to compress their associated springs.

Referring more particularly to the drawings, FIG. 4 fragmentarily suggests a conventional melting furnace 10 having a top 11 and an upwardly opening mouth 12. conventionally, the mouth 12 is provided with a laterally swingable lid (not shown) as illustrated at 16 in FIGS. 1 and 2 of said US. Pat. No. 3,756,582.

A hood is indicated generally by the reference numeral 13 in FIG. 1, the interior of said hood being suitably connected, as by a conduit 14, to a source of vacuum (not shown).

The hood is formed to provide a roof l and depending perimetral side walls 16 which are adapted to rest on the furnace top 11, the bottom of the hood being open so that the hood, when in place, envelops the open mouth 12 of the furnace.

A section 17 of the hood roof, with its corresponding sections of side walls, is hinged at 18 to the body of the hood 13 so that said section 17 may be swung, about the hinge axis 18, between its solid line position and its dotted line position in FIG. 1. Similarly, an adjacent section 19 of the roof, with its depending side wall sections, is hinged at 20 to the main body of the hood to swing between its solid line position and its broken line position. Obviously, when the

sections

17 and 19 are swung to their broken line positions, a lateral entry 21 to the interior of the hood is opened.

Rectilinear flange means 22 is supported on the hood roof to define, with said roof, a guide slot 23 (FIG. 3). A similar flange 24 (FIG. 1) defining a mating guide slot is secured to the hood roof in facing relation to the slot 23, and a roof section 25 has its opposite edges guidingly received in said slots for reciprocation in a line generally opposite the entry 21.

A depending skirt 26 (FIG. 3) is secured to move with the roof section 25 and

bumper pads

27 and 28 are suitably secured to the flange 26 to present, toward the rear of the hood,

flat faces

29 and 30 preferably disposed in a common vertical plane. I

In FIG. 2, I have illustrated a subframe indicated generally by the reference numeral 31 and disposed within the hood behind the skirt 26. Said subframe preferably comprises

uprights

32 and 33,

horizontal beams

34 and 35,

connectors

36 and 37 and posts'38 and 39. Preferably, the posts will be wide flange I-beams as is most clearly illustrated in FIG. 1.

A housing 40 is secured to the post 38 near the top thereof and is formed to provide a sliding, substantially horizontal guide way for a bumper pin 41 which, at its distal end, is formed to provide a bumperhead 42; and a coiled compression spring 43 is confined between the bumper head 42 and the distal end of. the housing 40, thus always resisting inward, or right-hand, movement of the pin 41. It will be clear that thebumper head 42 is aligned with the pad surface 29.

Similarly, a similarhousing 44 is secured near the upper end of the post 39 and provides a substantailly horizontal guide way for a similar pin 45 having-a bumper head 46 registering with the surface.30. A coiled spring 47 is confined between the bumper head 46 and the distal end of the housing 44, thus resisting rearward, or right-hand, movement of the skirt 26 as viewed in FIG. 1.

The hood roof is formed with an opening sized, shaped and located to conform to a conventional charging bucket 48 (FIG. 4) which is suitably supported as, for instance, at 49 for movement by, for instance, a crane (not shown). Such an opening is formed partly in the

sections

17 and 19 and'partly in the section 25. The furnace mouth 12 is normally closed by a movable lid (not shown) which is movable into and out of closing position by an oscillable post 50; while a cover 51 for the hood roof opening is mounted for movement about the axis of said post to and from closing relation with said roof opening. The cover 51 is formed with an opening 52 which receives a pin 53 carried by the furnace lid preliminary to swinging movement of the lid, whereby the cover is entrained to swing with the lid, all as is fully disclosed in said prior US. Pat. No. 3,756,582. The roof of the hood is formed with an arcuate slot 54 to accommodate movement of pin 53.

During melting and heat treatment of a charge, the furnace lid rests on and closes the mouth 12 and the roof cover 51 closes the opening through the hood roof, the

pins

41 and 45 being in their fully extended positions whereby the roof section 25 and the skirt 26 will be substantially in their forwardmost positions. When it is desired to introduce a charge into the furnace, the post 50 is manipulated to lift the furnace lid, thus pushing the pin 52 into the opening 53 of the cover 51. Now, when the post 50 is turned in a counterclockwise direction as illustrated in FIG. 1, the cover 51 will be entrained with the furnace lid and willbe swung into the dotted line position of FIG. 1. Thereby, an opening registering with the 'furnace mouth 12 and formed partly in the sections'l7 and 19 and partly in the section 25., will be exposed.

Now, the

sections

17 and 19 are swung into their broken line' positions, thus providing a path whereby the bucket 48 may be laterally moved, in the direction of the arrow 55, inwardly into the hood and toward the flange 26.

Usually, the bucket will be chain-suspended from a crane and, as the crane arm or carriage is decelerated, the bucket 48 will tend by inertia to move ahead of the suspending cable or chain. Thus, when the crane stops, the bucket will tend to continue to move.

As the bucket attains registry with the furnace mouth 12, it will encounter and tend to entrain the flange 26. The pad surfaces 29 and 30 being in contact with the bumper heads 42 and 46, such entrainments will drive the

pins

41 and 45 rearwardly against the tendency of their

springs

43 and 47. Those springs will absorb the momentum of the bucket as the bucket moves in the direction of the arrow 56 in FIGS. 3 and 4, and thereaf ter will return the bucket, in the direction of the arrow 57, to true registry with the furnace mouth 12.

Of course, the roof section 25 participates in the above-described movements of the skirt 26.

It will be immediately apparent that, if the skirt 26 is continued upwardly significantly above the hood roof, the crane operator may alternatively swing the bucket 48 horizontally at an elevation above the roof. The bucket will encounter the upward extension of the skirt and the

pins

41 and 45 and springs 43 and 47 will perform their snubbing function in a similar way, whereupon the bucket may be vertically lowered through the roof opening to the position of FIG. 4.

I claim as my invention:

1. For use with a melting furnace having an upwardly opening mouth, a hood constructed and arranged to rest on the top of such a furnace in enveloping relation l to said mouth, said hood including upstanding side walls and a roof closing the top of said hood, said hood having at least one section hingedly supported from the major portion of said hood to swing outwardly from said major portion to open a lateral entry to a position within said hood registering with said mouth, said entry being proportioned and designed to afford entry of a charging bucket to such registering position, said one section including a section of said roof and a correthe axis of said mouth, and spring means yieldably re.

sisting movement of said last-named section away from said axis.

2. The hood of claim 1 in which said last-named sec 7 tion includes a depending skirt shaped to engage and conform to a side wall of such a bucket, circumferentially-spaced pad means carried by said skirt and presenting flat faces'away from said axis, and in which said spring means comprises a pair of spaced posts carried on the inner surface of said hood wall opposite said entry, a first bumper pin carried by one of said posts and registering with one of said pads, a second bumper pin carried by the other of said posts and registeringwith the other of said pads, and a spring for each of said pins yieldably resisting movement of its pin away from said axis.

Claims

1. For use with a melting furnace having an upwardly opening mouth, a hood constructed and arranged to rest on the top of such a furnace in enveloping relation to said mouth, said hood including upstanding side walls and a roof closing the top of said hood, said hood having at least one section hingedly supported from the major portion of said hood to swing outwardly from said major portion to open a lateral entry to a position within said hood registering with said mouth, said entry being proportioned and designed to afford entry of a charging bucket to such registering position, said one section including a section of said roof and a corresponding section of said side walls, another section of said roof substantially opposite said entry being mounted for sliding movement toward and away from the axis of said mouth, and spring means yieldably resisting movement of said last-named section away from said axis.

2. The hood of claim 1 in which said last-named section includes a depending skirt shaped to engage and conform to a side wall of such a bucket, circumferentially-spaced pad means carried by said skirt and presenting flat faces away from said axis, and in which said spring means comprises a pair of spaced posts carried on the inner surface of said hood wall opposite said entry, a first bumper pin carried by one of said posts and registering with one of said pads, a second bumper pin carried by the other of said posts and registering with the other of said pads, and a spring for each of said pins yieldably resisting movement of its pin away from said axis.