US2183753A - Coke oven door machinery - Google Patents

Description

Dern 19, 1939; J. s, POTTER 2,183,753

COKE OVEN DOOR MACIINERY Filed Aug. 13, 1936 3 Sheets-Sheet 1 1 1x1-2H. v. x; mmmnm ATTORNEY Dec. 19, 1939. s, P01-TER 2,183,753

come ovEN Doof: MACHINERY Filed Aug. 1s, 1936 :s sheets-sheet 2 lmllllli 3 Sheets-Sheet 3 ORNEY Dec. 19, 1939. J. s. POTTER coxE OVEN Doon MACHINER)v Filed Aug. 13. 1936 Patented Dec. 19, 1939 UNITED STATES COKE OVEN DOOR MACHINERY Joel Sanford Potter, Valley Cottage, N. Y., assignor to Louis Wilputte, New Rochelle, N. Y.

Application August 13,

21 Claims.

The general object of the present invention is to provide improvements in door machine mechanism for use in removing and replacing the doors which normally close the ends of the cokingV 3 chambers of a horizontal coke oven battery.

More specifically the object of the invention is to provide improved mechanism for removing and replacing self sealing coke oven doors comprising special door locking provisions, devised by me, whereby, in the normal closed position of the door, spring means act between the door and its locking bar, or each of its locking bars, to press the door inward against the stationary door frame and to press the locking bar outward into engagement with stationary door retaining members, which ordinarily are hook projections from the door frame. l

The present invention relates `4particularly to a door machine bodily movable, as is usual, toward served, and comprises means for giving each door served, the vertical movements required for the transfer of the weight of the door between its door frame and the door machine in the door removing and replacing operations, and for acting on a door having-the above-mentioned special locking provisions, to relieve the spring action between the door and each locking bar and to raise the latter out of engagement with the corresponding retaining hooks during the door removing operation,l and to lower each locking bar into engagement with said hooks and restore said spring action during the,k door replacing operation.

A further specic object of the present invention, is to provide means whereby the vertical bodily movements given to each of the doors served by a single door machine, will be suitably small and approximately the same, notwithstanding variations which may amount to several inches, in the vertical distance between the general level of the door machine and the general levels of the dierent doors served by the door machine. The means which I have devised for the attainment of the last mentioned object, are not necessarily restricted to use in connection with coke oven doors having the special locking provisions mentioned above or even with self-sealing doors, but may be used in door machines handling the clay luted coke oven doors in use on most existing coke oven batteries in this country.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to, and forming a and away from the door frame for each doorv 1936, Serial No. 95,806

part of this specification. For a better understanding of the invention, however, its advan-I tages, and specific objects attained with its use, reference should be had to the accompanying drawings and descriptive matter in which I have 5 illustrated and described a preferred embodiment of the invention.

Fig. 1 is an elevation in section on Vthe'line I--I of Fig. 2, showing a portionof a cokeoven battery with a door thereof in its closed position, and 10 an associated door handling machine;

Fig. 2 is a horizontal section on the line 2--2 of Fig. l;

Fig. 3 is a partial horizontal section on the line 3 3' of Fig. 1;

Fig. 4 is a partial elevation in section on larger scale than Fig. 1, of parts therein shown;

Fig. 5 is a fragmental elevation of the door -taken at right angles to Fig: 1; and

Fig. 6 is a view, takensimilarly to Fig. 1, illustrating a door machine of modified form.

AIn the type of coke oven structure shown in part in Figs. 1 and 2, horizontally elongated coking chambers A and heating walls B, arel arranged side by side in a row, in which the coking chambers alternate with the heating walls. The coke oven masonry is reinforced land supported at the sides of the battery by a metallic armor, which as shown, comprises a ash plate C at each heating wall end, a corresponding vera0 tical buckstay D by which the ash plate is held in place, and a door frame member E at each end of each coking chamber. Each door frame member E may be, and as shown, is a onepiececasting extending around the door opening, and including a portion E' vwhich extends into the coke oven brick work, and is shaped to provide an outwardly facing sealing surface E2. The latter extends transversely to the length of, and surrounds the coking chamber. The corners of the heating walls are recessed at B to permit the door frame member to extend into the oven structure as shown.

As shown the door frame member E is provided with adjustable side flanges E3 abutting against the adjacent iiash plate C, and isanchored in place by adjustable clamping connections between its sides and the adjacent buckstay members D, said connections comprising parts d welded to the buckstays, clamping levers F, and bolts G. Each door frame member E, has rigidly attached thereto an upper and a lower hook part H at each side of the door, forv e11- gagement with locking bars L normally holding a door in position to close the doorwayopening 55.

2- arcane f surrounded by the door frame member. The hook parts all extend upwardly.

Associated with each of the different door frames E of thebattery is a coke oven door. The

5 different doors at one side of the battery ordinarily are exact duplicates of one another. The particular door form illustrated, is one in which each door comprises a rigid outer section I, an inner plug section J and an intermediatesealing section K. As shown the outer section I is a metal casting comprising a plate-like body or web portion with an outwardly extending marginal flange or rim portion yI. The sealing section shown comprises a ilat sheet metal body portion with a transverse marginal inwardly extending sealing rim or ange K'. 'I'he latter in the closed position of the door has its inner edge in\e\n gagement with the door frame sealing surface I?. As shown, the plate K and a bracket part J at the inner side of the latter, are rigidly secured to the door section I at the bottom of the door. The plug section J of the door has its weight supported by the bracket portion J', and

Acomprises a body of refractory material rein` forced by a metal post J2 which, in the assembled condition of the door, is mechanically anchored at its lower end in the bracket J', and is connected at its upper end to the sealing member K4 by means of a keeper part J3 having a bolt extension J4 passing through the body portion of the member K. So-called clamping connections IK between the marginal portion of the sealing member K and outer door section I are provided to give the sealing edge of the flange K' the contour required for gas-tight engagement with the door frame surface E?. notwithstanding relative door frame anddoor distortion which may occur in use.

In its closed position, the weight of each door 4o is carried by lugs E4 projecting from the side edges of the door frame E,.beneath and in supporting relation with outwardly extending lugs i projecting from the sides of the rigid door section I. To insure the proper relative lateral positions of the vertical portions of the door sealing ilange K' and the surface E. the lugs E* are provided with inclined guide surfaces E5 between which the projections i must enter as the `door is moved in the door-replacing operation into its normal closed position shown in Figs. 1 and 2. For additional preliminary guidance of the door as it is being replaced, the hook members H are formed with inclined guide portions H' in position to be engaged by one or another of the projections i; if the door is not in lateral register with the door frame during the initial movement of the door toward the door frame.

In respect to the features of door construction' already specifically referred to, the door shown e0 comprises nothing claimed as novelherein, or forming a part of the present invention, which is not restricted to use-in connection with the particular door construction illustrated. The door shown is normally secured in place by upqu;V per and lower locking bars L, each of which is adapted to engage a corresponding pair of hook parts H, and is movable horizontally tolward and away from the door, and is movable vertically relatively to the door between a lower hook engaging and an upper hook clearing position. Resilient means act between each locking bar andthe door when the latter is in its normal closed position, to press the locking bar outward against the hooks', and to press the door '75 inward and thereby maintain a gas tight joint 'm'. The rails m2 support the wheels M of la between the door edge K' and the door frame surface E. 'I'he resilient means normally acting' on each locking bar` may berendered inoperative by an upward thrust, given it by the door maf.

' chine, so as to free the locking bar for vertical .5

movement'out of and into engagement withthe hooks H.

In the construction shown, the mounting means for the upperlocking bar L comprises a horizon- `tal rock shaft L' supported by the door member' l0' I, and provided with an uprising arm L to which are pivotally connected arms L connected at their outer ends to the locking bar L. Said shaft L' also carries a horizontally disposed arm L4, adapted to be tilted counter-clockwise by the 1B door machine. as hereinafter described, and thereby move the locking bar toward the door. In the normal closed position of the door, the upper locking bar is subject to a resilient force.

ftending to move it awayfrom the door by means 20 of a spring I! acting between the arm L and a part P carried by the door section I. As' shown'. the springv I..s is a vertically disposed compression spring acting above and 'having its lower end engaging the lever L4, and engaged at its 5 upper end by an adjustable abutment L" connected to the part P by a tie bolt Il'. In the construction shown, the part I2 is a casting detachably connected to the web or body portion of the member I, and' provided with bearings for so l the `ends of the shaft Lf. The part P is provided with a depending portion P for engagementby the Adoor machine lifting means.

The lower locking bar L is mounted and supl ported and resiliently acted upon by parts shown g5 as identical with those associated with the upper locking bar, except that the lower bracket I l differs from the corresponding upper bracket P, in that it includes no part corresponding to the previously mentioned part I3, and in that it is o provided with a special bearing surface In for engagement by a door machine part.

The door machine shown in Figs. l and 2 comprises a, carriage m, which runs on track rails m' alongside the battery, and supports horizontal rails m2A which extend transversely to the rails carriage M which is movable on the carriage m toward and away from the side of the coke oven structure. The door handling mechanism proper is mounted on the carriage M. At the coke side lof the battery, the carriage m may well be a special door machine carriage, as shown, while at the pusher side of the battery, the carriage M may be mountedon the pusher machine, which may then be regarded, for the purpose of the present invention, as constituting one form of the carriage m.

Any usual or suitablemeans may be employed to give the carriage M its movements toward w and away from the adjacent side of the coke oven structure. As shown, the carriage M is given such movements by a crank arm M carried by a crank shaft M3 journalled in the carriage m. and rotated through speed reducing gearing enclosed in a casing M4 by a motor driven shaft M5. The crank arm M2 is Vconnected to the carriage M by a link including a spring M*s permitting the link to contract in length when the door handling machinery engages a door frame as hereinafter described. As shown, the crank arm M2 and link M5 are so disposed that their pivotal connection moves slightly through dead connected by al horizontal pivot shaft .M. The

member N comprises a body portion in the"iorm of a vertical beam of channel vbar cross section, to theends of which are swivelled top and botvtom buifer portions N and N2, respectively adapted to engage the door frame at or adjacent the top and bottom of the latter; to thereby properly position the door engaging machinery in each door engaging or replacing operation. As shown, the buffers engageside surfaces E6 of the door frame which are displaced for definite distances from theA adjacent portions of the door frame sealing surface E. The movement permitted the member N about the shaft MB, isk limited by a connection including an adjustable spring N3 and lever N4, between the member N and column M'l. The said connection tends to hold the beam Nin' such position that the `lower buffer N2 is nearer to the door frame than the upper buffer N1 except when the spring N3 is compressed by movement of the carriage M to bring the upper, as well as the lower buffer parts into engagement with the door frame surfaces E8. This helps to' insure that in each 'door replacing operation, the lower portion of the sealing edge K will be brought into snug engagement with the surface lil2 before the weight of the door is transferred from the door machine to the door frame, as is desirable to insure proper sealing. The amount which the `spring N3 tends to hold the lower end of the beam N in advance of its upper end may be varied b y adjustment ofthe nuts N'1 forming the abutment for the upper end of the spring N3 along the rod N6 on which the nuts are threaded and through which the spring acts on the lever N4.

The door lifting and locking b ar adjustment parts of the door machine are carried by a member O mounted on the member N for straight line movement relative to the latter in a direction which is parallel to the plane including the portions E6 of the door frame engaged by the buffers. The member O comprises an upper cross head part O', which may be a casting, a lower cross head part O2, which may also be a casting, and a connecting portion shown as formed by two channel bars O3 bolted or otherwise rigidly connected at their ends, to the upper and lower cross heads O' and O2. The member O is guided in its general vertical movements relative to the member N by guide wheels O4 carried by a shaft O5 journalled in the upper cross head O' and similar guide wheels O4 carried by a shaft O5 journalled in the lower cross head O2. The guide wheels O4 run between guides N5, shown as formed by angle bars secured to the inner sides of the member N. The member O is given its up and down movements through a link OP pivotally connected at its upper end to the head O', and pivotally connected at its lower end to a lever P carried by a, shaft Pf secured at its ends to the member N. The opposite end of the lever P is connected by a link PQ to a crank pin Q carried by a crank disc Q'. The latter-is oscillated through suitable speed reducing gearing, by a motor Q2 which, with said reducing gearing, is mounted on bracket extensions N6 of the member N.

The head O' is formed with a door lifting arm O6 adapted to engage the under side of portion I3 of the door to lift the latter in the door removing operation and to support" the door until the latter is returnedintosupporting engagement with its door frame. IZi'he arm 0, commonly called a lifting hook, has an, upper hook extension which extends between the' body -porzontal movement of the door out ofthe Ydoor ing arm 0a from said finall positionto said initial position.

In Fig. 1 the horizontal lines- I, 2, 3, I and 5 representsuccessively higher levels of the lifting surface formed by the upper horizontal edge of the arm 0, moving or replacing operation. The levels I and 5 are those of the above mentioned initial inoperative and final positions, respectively, of the lifting surface of .the arm O8, and the level 2 is the level of said surface at which the door is first engaged by the member 0, operatively, in the sense of subjecting a door part to a significant upwardly acting force. 'I'he distance between the different levels 2-5 depend solely upon door or door machine proportions, and are the same for all the doors at one side of the battery when the doors are duplicates of one another as should be the case. The actual height of those in different stages of a door re levels above the earth'ssurface or other hori- A zontal datum plane, may be different for different doors as a result of nonuniformity in the vertical dispositions of the diiferent door frames E, due to lack of precision in the initial construction of the battery, or the distortion of the latter occurring in use. The level. I is the level of the 'lifting edge of the arm O in the position of the latter when' the carriage M is moved into operative engagement with a door frame E at the beginning of a door removing operation, and out of such engagement at the end of a ,door replacing operation. The level I for each door is thus at a fixed distance, depending on the door machinery proportions, above the level of the wheel engaging surfaces of the adjacent portions of the track rails m.

The actual distance between the levelsil and 2 may bev different for different doors. Inithe case of a long battery, even though well conas great as 3". The minimum distance betweenv the levels I and 2 must be sufcient to provide adequate clearance between the top of the upwardlyextending hook and the top of the inner end hook portion of the arm O3, when the latter is in its initial level I position.

the level I, reaches the'first Voperative level 2, the upper locking bar actuating lever L4 isengaged by an engaging part of the member O. which, as shown, is a roller O'l carried by a shaft having its ends supported in the head O'. As the upward movement of the member O continues from the. level 2 to the level 3, the arm L4 is turned counter-clockwise against the action of the spring L5, and the latch bar L is given a `y When the lifting arm O6, moving upward from initial horizontal movement of the latter sumcient'to move the locking bar out of frictional engagement with the vertical portions of the hooks H, but in the construction shown in Fig. l, separate means are provided to .lift the locking bar above the tops of the hooks as the arm Ol is moved from the level 3 to the level 4. The said vmeans comprises a lever journalled on a pivot shaft 0 carried by the head O', and adapted to engage and be tilted by the underside of the projection I3, while the arm 0 is moving between the levels 3 and 4. The outer end of the lever 0B is connected by a link 01 to a locking bar lifting lever 0l1 pivotally connected to the head 0' by a pivot shaft 0u, and carrying rollers 013. The latter engage the ends of the locking bar L and lift the latter, as the head O' moves between the levels 3 and 4. As shown, the leverage is such that the locking bar lifting movement effected as the arm 0 moves between the levels 3 and 4, is several timos the vertical distance between those levels. When the arm 06 reaches the level 4,A it operatively engages the door part .13, and as the movement of the arm 0f5 continues from the level 4 to the final level 5, the door is lifted for a distance equal to the. vertical distance between the levels 4 and I.

The lower locking bar actuating lever L* is,

engaged by a roller 015 mounted on the lower head I, and corresponding in form and purpose to the roller 0", and serving to move the lower locking bar toward the door, while the arm 0 is moving between the levels 2 and 3. While the member O is moving between the levels 3 and 4, the lower locking bar is lifted by a lever 01' mounted inthe lower head P and corresponding to the upper lever O, by means of a link 01' connecting the two levers.

The door lifting operation terminates when the arm O6 reaches the level i. The door may then be removed from the door frame by horizontal movement of the carriage M away from the adjacent side of the coke oven structure on the rail m2. In replacing the door, the carriage M is again moved toward the adjacent side of the coke oven structure until the upper and lower abutments N1 and N1 are brought into operative engagement with the door frame surfaces Ef, after which the weight of the door is transferred from the door machine to the door frame, and the door is automatically locked in place by down movement of the member O. as

the latter moves from the level 5 to the level I.

The up movement of the member 0 is terminated at the appropriate level i for each door engaged, by means automatically effective to insure that the lift given each door is the same,

notwithstanding such variations as may be expected to occur in the case of different doors.

.in the vertical distance between the level ofl the track rails m' and the level of the under side of the door portion I3. rl .he means by which this is accomplished shown in Figs. 1 and 2, comprises a limit switch control for the motor Q2` terminating the movement of the latter in the direction to lift the member 0 when its arm O's has reached the desired nal level 5, regardless of the actual difference between the levels I and 5. The limit switch operating means shown in Fig. 1, comprise `a lever R pivoted at R' to a door, more or less down movement will be given the roller R3, depending on the vertical distance between the under side' of the horizontal inner portion of the rib I4 and the level of the trackA rails m. When the movement of the door machine toward the door is concluded, a hook portion R4 of the bar l?.2 is at a level which bears a nxed relation to the actual levels of the door parts I4 and I3.

The hook portion R4 of the bar R2, engages and actuates a limit switch arm R5 mounted on the member 0, .as the hook portion R* moves down and arm R moves up during the door lifting operation, and their engagement interrupts the operation of the motor Ql in the door-lifting direction, after an up 4movement of the member 0 corresponding to the distance between thev levels 2 and 5, that 'distance being the same in the caseA of all doors. The movement of the member 0 between the levels l and 2 is thus an idle movement, and will vary with thedisplacements of the dierent doors vertically with respect to the level of the adjacent portions of the track rails m. The distance between the track rail level and the levell depends. upon the door machine construction and is always the same. The motion of the motor Q2 in the direction to lower the member O may be limited 'by the operation of a second limit switch (not shown), which may be of any usual form, and may be actuated by the movement into a predetermined position of one or another of the moving door machine parts, such as the crank disc Q'.

To insure a gas-tight closure it is practically essential thatthe lower portion of the sealing flange Kl should be in snug engagement with the door frame sealing surface Ea at the time at which the weight of the ldoor is transferred from the door machine to the door frame lugs E3, in the door replacing operation. The means, including the spring N, for tilting the lower end of the beam toward the door frame, contributes to the proper engagement of the lower portions of the ange K1 and surface li!2 during the door I replacingoperation, but its action is desirably spring S1 acts between the abutment 01s carrled by the part I2 and an adjustable abutment S3 in the form of a nut threaded on a rod Eis which extends axially through the spring S1 andl passes loosely through, and is guided by, the bracket 01, and is anchored at its inner vend in a bracket-like portion S4 of the plunger S. The'principles of the present invention may be utilized in apparatus quite different in formfrom that illustrated in ma. 1-5, and in mg. e

I have illustrated one modification of the apparatus already described. The machine shown in Fig. 6 comprises a member NA corresponding generally in its mounting and .operation to the previously described member N. Mounted on the member NA is a member OA, which may be a casting generally like the upper head O' of the previously described member O. The member OA carries .upper and lower guide wheels O travelling in guideways formed by guide members N4 secured to the member NA. The member OA carries a door lifting arm O6 adapted to engage a door projection'P, as does the arm O0 of the member O.

In Fig. 6 the latch bars L are released and the door is lifted as a result of the oscillation of a rock shaft arm PA corresponding generally to the lever P of the construction first described. The arm PA is carried by a rock shaft PA' journalled in the member NA, and link connected to a crank arm QA rotated through suitable speed reducing gearing by the motor Q2. To the inner end of the arm PA is pivotally connected the lower end of a link or thrust kmember P10 which is pivotally connected at its upper end to a link P11 pivotally connected to the member NA at N10. The member P10 carries rollers P12 engaging the upper latch bar actuating arm L4 when the arm PA is turned clockwise in the door removing operation.

After a slight initial counterclockwise movement of the arm L4, suilicient to relieve the spring action on the latch bar, the latter is engaged by the arm L4, so that the further turning movement of the latter, lifts the latch bar above the tops of the hook members H. As the member P10 is moved upward into engagement with the latch bar the member` OA moves upward under the action of a spring 041 carried by the member NA which forms a suspension connection for the members OA. The tension of the spring O41 is more than sumcient to support the weight of the member OA, but is not great enough to subject the door to a significant lifting force.

When the arm O0 engages the door part I3, the upward movement of the member OA is temporarily arrested. After the further up-movement of the member P10, which releases the upper latch bar and raises it above the level of the cooperating hooks H, a yoke portion of the member P10 in the form of a roller P13, engages the under side of the arm Os and gives the arm O0 its door lifting movement.

In the initial position of the door machine, the roller P13 is in engagement with the upper side of the arm O0, and holds the latter suitably below the door part I3. In Fig. 6, the parts are shown in the position occupied after an initial up-movement of the member P10 sunlcient to permit the Varm O6 to operatively engage the door part I3.

In the door removing operation, the up.move ment of the member P10 relieves the spring action on the lower locking bar L and raises the latter by means of a link P14 connecting the member P10 to a lever P15 similar to the lever P11 which is pivotally connected to the beam NA and acts directly on the arm L1 associated with the lower locking bar. The beam NA supports aspring pressed plunger SA engaging the door surface 121 as does plunger S of the construction rst described. The beam NA is biased for movement of its lower end toward the side of the coke oven battery by means including a spring N30 similar fin its action to the spring N'J of the construction first described, though diilering from the latter in its location.

The door machine shown in Fig. 6 yincludes a limit switch mechanism controlling the extent of movement of the motor Qz in theA direction giving a rising `movement to the door lifting arm O0 which is identical in principle with the linut switch mechanism for the same purpose of the mechanism rst described. The limit switch mechanism of Fig. 6 comprises a lever RA which may --be' identical in its form, mounting, and action with the lever R previously described, but as shown in Fig. 6, the lever RA is operatively connected to a vertical movable bar R20 corresponding to the previously mentionedy bar R3, by a link and lever R10, the latter being pivotally supported R11 by the member NA. 'I'he hook at the upper end of the bar R20 coacts with a limit switch arm R carried by the member OA and corresponding to the arm R5 of the construction rst described.

Novel features of coke oven door construction and arrangement, disclosed but not claimed herein, are disclosed and claimed in my prior copending applications, Serial No. 28,264, led June 25, 1935, Serial No. 84,596, filed June 11, 1936, and Serial No. 88,676, iled July 2, 1936. Novel door machinery construction and arrangement features disclosed in common in said prior applications, Serial Nos. 28,264 and 84,596, and in the present application, are claimed herein.

In particular, said prior applications collectively disclose and claim coke oven doors comprising various forms of the special locking provisions illustrated and described herein, and disclose and generically and specincally claim various forms of coke oven door machines, specically different from those disclosed and claimed herein, but adapted to relieve and restore the spring action between coke oven doors and their locking bars in the course of the door removing and door replacing operations.

While in accordance with the provisions of the statutes, I have illustrated and described the best forms of embodiment of my invention now known to me, it will be apparent toy those skilled in the art that changes may be made in the form of the apparatus disclosed without departing from the spirit of my invention as set forth in the appended claims and that in some cases certain features of my invention may be used to advantage without a corresponding. use of other features.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A door machine for removing and replacing doors normally closing the ends of horizontal coke oven chambers, comprising in combination a door engaging member adapted for movement upward to engage a door occupying its normal closed position and lift the door to a higher level, means for moving said member upward from an initial position `fixed by the door machine and independent of the door position and below its position of engagement with the door, and means for interrupting the upward movement of said member after a movement of the latter upward from its said position of engagement, which is predetermined and independent of the distance between said initial position and said position of engagement. Y

2. A door machine as specified in claim 1, in

which the means for interrupting the up move? ment of said member is a vlimit switch mechanismcomprising a part moved by said member, and a part engaging, andvertically positioned by the door.

' 3. In a coke over door machine for 'removing and replacing a coke oven door which in its closed position is seated in a vertically disposed door frame, the combination with a supporting structure movable toward and away from said door frame, of la beam pivotally connected to said structure to turn about a horizontal 'axis and including upper and lower portions adapted to engage upper and lower portions, respectively, ofthe'door frame, and formed with a vertically disposed guideway, and a door iifting member mounted on saidbeam for vertical movement in said guideway.

4. In a coke oven door machine for removing and replacing a coke oven door having movable door locking means and which in its closed position is seated in a vertically disposed door frame, the combination with a supporting structure movable toward and away from said door frame, of a beam pivotally connected to said structure to turn about a horizontal axis and including upper and lower portions -adapted to engage upper and lower portions, respectively, oi' the door frame, and formed with a vertically disposed guideway, a door lifting member mounted -on said beam for vertical movement in said guideway, locking bar actuating means mounted on said beam and including an actuating part, and a common actuating mechanism for giving said member vertical movements in said guideway and for giving said actuating part up and down movements related to but dissimilar to the vertical movements given said member..

5. In a coke oven door machine for removing and replacing a coke oven door having movable door locking means and which in its closed position is seated in a vertically disposed door frame, the combination with a supporting structure movable toward and away from said door frame, of a beam pivotally connected to said structure to turn about a horizontal axis and including upper and lower portions adapted to engage upper and lower portions, respectively, of the door frame, and formed with a vertically disposed guideway, a door lifting member mounted'on said beam for vertical movement in said guideway, locking bar actuating means mounted on said beam and including an actuating part, and a common actuating mechanism for .giving said member verticalmovements in said guideway and for giving said actuating part up and down movements of greater extent than the vertical movements given said member.

6. In a coke oven door machine for removing and replacing a coke oven door which in its closed position is seated in a vertically disposed door frame and is resiliently held in place by a locking mechanism including a locking bar movably mounted on said vdoor and resilient means tending to move said bar away from the door, the combination of a supporting structure movable toward and away from said door frame, a beam pivotally connected to said structure to turn about a horizontal axis and including upper and` lower portions adapted to engage upper and lower portions, respectively, of said door frame, a doorlifting member mounted on said beam for straight line movement relative thereto in the longitudinal direction of the beam, means for actuating said locking mechanism comprising a part pivoted t0 said beam.

an engaging 'part given upand down movements by angular movements of the first mentioned part. and a common actuating mechanism for giving separate up and down movements to said member and said engaging part.

7 In a coke oven door machine for removing and replacing a coke oven door which in its closed position/is seated in a vertically disposed door frame and is resiliently held in place by a locking mechanism including a locking barl movably mounted on said door and resilient means tending to move said bar away from the door, the combination of a supporting structure movable toward and away from said door frame, a beam pivotally connected to said structure to turn about a horizontal axis and including upper and lower portions adapted to engage upper and lower portions, respectively, 'of said door frame, a door lifting member mounted on said beam for up and down movements relative thereto, means for actuating said locking mechanism,

mounted on said beam for upand down movements relative lthereto, and an engaging part given up and down movements by angular movements of the first mentioned part, and a common actuating mechanism for giving separate up and down movements to said member and last mentioned means, directly connected to the latter, and connected to said member through a lost motion connection.

8. In a coke oven machine for removing andv replacing a coke oven door which in its closed position is seated in a vertically disposed door frame and is held in place by locking means including a loclnng bar movably mounted on said door, the combination of a support movable toward and away from said' door frame, a door lifting member and a locking bar lifting part mounted on said support for up and down movement, and a common actuating means for said member and part mounted on said support and directly connected to said part for giving the latter its up and down movements, and connected to said member through a lost motion vconnection permitting limited up and down movement of said part without a corresponding up and down movement of said member.

9. In a door machine for removing and replacing doors normally closing the ends of horizontal coking oven chambers, the combination of a supporting structure horizontally movable into operative relation with each of a plurality of oven chamber ends, a door engaging member mounted on said structure for movement upward relative to the latter to first operatively engage a door occupying its normally closed position and thereafter to lift the door to a higher level, means for moving said member upward from an initial position which is below its position of engagement with the door and is independent of the door position and is dependent on the position of said structure, and a limit switch mechanism for terminating the door lifting movement of said member after an extent of movement of the latter upward from its said position of engagement which is predeterminedand independent of the distance between said initial position and said position of engagement.

- l l0. In a door machine for removing and replacing doors normally closing the ends of horizontal coking oven chambers, the combination of a supporting structure horizontally movable into operative relation with each of a plurality of ovenchamber ends, a door engaging member mounted on said structure for movement upward 75 relative to the latter to rst operatively engage a door occupying its normally closed position and thereafter to lift lthe door" to a higher level,

means for moving said member upward from an initial positionwhich is below its position of engagement with the door and is independ-A ent of the door position and is dependent on the position of said structure and a limit switch mechanism for terminating the door lifting movement of said member after an extent of movement of the latter upward from its said position of engagement which is predetermined and independent of the distance between said initial position and said position of engagement, said mechanism comprising relatively movable parts and means forgiving them a relative movement of predetermined extent as said member is given the said doorlifting movement, and means including an element engaging and vertically positioned by the door for insuring the same relative positions of said 'parts at the beginning of the said door lifting portion of its up move-f ment into its door engaging position.

1l. The combination with a coke oven door structure comprising a door body adapted to engage the door seat of a coke ove`n structure having door holding means associated with said seat, and comprising a locking member mounted on said body for movements toward and away from said body and comprising resilient means acting between said locking means and door body and tending to move them apart whereby said door body may be pressed against said seat by said resilient means when the locking member engages said holding meansand is thereby held against movement away from said seat, of a door lifting and moving mechanism including means for subjecting said door structure to substantially self-contained stresses, including opposing stresses acting on said resilient means to interrupt the action of the latter between the door body and locking ba'r.

12. The combination with a coke oven door structure comprising a door body adapted to engage the door seat of a coke oven structure having door holding means associated with said seat, and comprising a part adapted to be engaged by a door lifting hook, and comprising a locking member mounted on said body for movements toward and away from said body, and comprising resilient means acting between said locking member and door body and tending to move them apart, whereby said body may be pressed against said seat by said resilient means when the locking member engages said holding means and is thereby held against movement away from said seat, of a door lifting and moving mechanism including a door lifting hook and means movable relative to said hook for subjecting said door structure to substantially self-contained stresses including opposing stresses acting on resilient means to interrupt the action of the` latter between the door body and locking bar. f

13. The combination with a coke oven door structure comprising a .door body adapted to engage the door seat of a coke oven structure having door holding means associated with said seat, a. locking member mounted on said body for movements parallel to said body between locking and releasing positions and for movements toward and away from said body, and resilient means acting between said locking member and door body and tending to move them apart, whereby the door body may be pressed against said seat by said resilient means when the locking I'3' member engages said holding means and is thereby held against movement awayv from said seat. oi' a door lifting and moving mechanism including means for subjecting said door structure to substantialy self-contained stresses includingopposing stresses acting on said resilient means to interrupt the action of the latter between the door and lockingbar, and for engaging and lifting said locking member out of engagement fwith said holding means.

14. The combination with a coke oven door including a rigid outer portion and adapted to be removably seated in a stationary door frame, of f door locking means movably mounted on aid door, and a door machine including a, structure movable toward and away from said door frame, a beam pivotally connected to said structure to turn relatively thereto about a horizontal axis and thereby bring upper and lower portions of lsaid beam into engagement, respectively, with upper and lower portions of said door frame, and means mounted on said beam operable when said beam is in engagement with said door frame, to

actuate said locking means to release the door and to lift the latter.

l5.. A combination as specified in claim 14, in which said beam is biased for movement about the axis of its connection to said structure, into a position in which a door engaged and supported by said beam has its lower portion nearer than its upper portion to the door frame, whereby in the door replacing operation, the lower portion of the door will engage and be held against the lower portion of the door frame as the upper portion of the door is moved into engagement with said frame.

16. The combination with a coke oven door adopted to seat in a vertically disposed door frame, and provided with an engaging portion above and at the outer side of the center of gravity of the door, and a door machine including a structure movable toward and away from the door frame and comprising a beam pivoted to turn about a horizontal axis relative to said structure to effect engagement of upper and lower portions of the door frame by upper and lower portions of said beam, respectively, when said structure is moved toward said door, an upwardly movable part mounted on said beam and adapted to engage the said engaging portion of the door and lift the latter and resilient means carried by said beam and adapted to engage and prevent outward movement of the lower portion of the door relative to its upper portion, as the door is being lifted by said upwardly moving part.

17. The combination with a cokew oven door adapted to be removably seated in a door frame, and provided with a horizontalv locking .bar movable toward and away from the door, and having its ends extending beyond the side edges of the door and adapted to engage hooks carried by said door frame and including resilient means acting between the door and bar and tending to move the latter away from the door, and a door machine including a structure movable toward and away from said door frame, and door engaging parts mounted on said structure and movable upward relative to the latter and adapted to engage and render said means inoperative during 18. The combination with a coke oven door removably seated in a stationary door frame, of door locking means movably mounted on said door, resilient means normally acting between, and tending to separate said door and locking means, and adoor machine including a structure movable toward and away from said door frame. a beam pivotally connected to said structure to turn relatively thereto about a horizontal axis and thereby bring upper and lower portions oi said beam into engagement, respectively, with upper and lower portions of said door frame, and means mounted on said beam operable, when said beam is in engagement' with said door frame, to render said resilient means inoperative and to lift the door.

19. A coke oven door machine for removing and replacing a coke oven door which in its closed position is seated in a vertically disposed door frame, said machine comprising a supporting structure movable toward and away from said door frame, a beam-pivotally connected to said structure to turn about a horizontal axis and inciuding portions respectively above and below said axis and adapted to engage upper and lower portions, respectively, of the door frame. door lifting means mounted on said beam, and yielding'4 means acting between the structure and beam and tending to hold thelower and upper portions of the latter at lesser and greater distances, respectively, from the door frame.

including a rigid outer portion and adapted to be 20. A coke oven door machine for removing and replacing a coke oven door which in its closed position is seated in a vertically disposed door frame, said machine comprising a supporting structure movable toward and away from said door frame, a beam pivotally connected to said structure `to turn about a horizontal axis and including portions respectively above and below said axis and adapted to engage upper and lower portions, respectively, of the door frame, door lifting means' mounted on said beam, yielding means acting between the structure and beam and tending to hold the lower and upper portions of the latter at lesser and greater distances, respectively, from the door frame, and means adjustable to vary said distances.

21. The combination with a coke oven door, of an element mounted on said door for angular movement about a horizontal axis and comprising a vertically disposed portion and a horizontally disposed portion, a locking bar, a connection between the latter and said vertically disposed portion, a spring connecting said door and element and tending-to turn said element in the direction to move said locking bar away from the door, and a door machine including means upwardly movable and adapted on its upward movement, to engage said horizontally disposed portion and move said locking bar toward the door, and thereafter to engage and lift the door.

' JOEL SANFORD POTTER.

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