US2798752A - Door fastener operating means - Google Patents

Description

' July 9, 1957 F. DOLL v v 2,798,752

DOOR FASTENER OPERATING MEANS Filed April 2'7, 1953 as 34 35 a7 29 J/WEN 0R. FRANZ 4 A7TORNE Y.

2,798,752 Patented July 9, 1957 United States Paw @filicc by mesne assign- Pittshnrgh, Pa., a

The present invention relates to door fasteneroperatingmeans for the doors of horizontal coking chambers or other ovens, in which the door body, or a sealing part carried thereby is, in the closed condition of the door, held gas-tight against the door frame by means of spring pressure applied between the door, or door part, and a latch, and a latch screw for the latch is located outside the pressure path between the fastener spring means and. the latch, whereby the spring means can be compressed, without the exertion of pressure on the latch screw, by movement of the latch.

Doors of this character have been found very satisfactory since they enable a uni-form sealing pressure to be obtained and to be automatically re-instituted each time the door is re-set in the oven mouth, whilst the sealing pressure exerted by the fastener spring means can be adjusted, if need be, at any time after the door has been set in the oven mouth.

It is an object of this invention to provide fastener means of this character in which the latching and unlatching operations can be performed optionally by rota-ry movement manually or by an axial movement automatically from a machine movable from one oven to another.

Other features of the forth.

, A preferred embodiment of the invention is illustrated in'the accompanying drawings, wherein Fig. 1 is a horizontal section through a door inserted in the mouth of an oven chamber and having door fas tener operating means in accordance with the present invention, and

Fig. 2 is an enlarged section of a detail of the mechanism seen in Fig. 1.

The door illustrated has a refractory plug 1 which enters the oven chamber 3 defined between side Walls designated 2. Along the longitudinal sides of the oven batterythe masonry is clad with a metallic reinforcement 4 against which is applied and held, by screws or the like not illustrated in the drawings, a cast iron door frame 5 surrounding each chamber mouth. A resilient sealing frame 7 of angular formation in cross section is connected to the door and, when the latter is closed, bears in sealed fashion against the sealing surfaces, as 6 of the door frame.

The refractory door plug 1 is held in clamped relation on the door by a cast iron carrier frame 8 which is rigidly connected to a plate 9 forming the front of the door. Bearings 10 are firmly secured to this plate at each of its upper and lower parts. Each of these bearings 10 has a central bore 11 in which is screwed a threaded boss 12 for the latch. This boss carries at its other end, that projects forwards from the bearing 10, a pressure imparting sleeve 13, which is axially displaceable on the boss 12 and has the closure and fastener latch 14 rockably mounted thereon. In the closed condition of the door, the two ends of the latch 14 are disinvention are hereinafter set 2 t t posed behind :hooks ,15 which are rigidly connected to the oven body, for example to the door frame 5 secured to the oven body reinforcement- 4.

At its outer end the boss 12 isfurnished with flat surfaces 16 adapted to receive a key for'rotating the boss 12. This boss further has an axial bore 17 in which is axially movable a latch screw bolt 18 threaded at 19. The inner or rear endpart of the latch screw bolt 18 is formed as a smooth stem '20 which isfurnished with an annular groove 21. At its outer or forwarded part the latch screw bolt 18 has a collar 22, adjoined by a head 23 having flat surfaces for engagement by a key or like-tool for the purpose of tightening or releasing the mechanisms as hereinafter referred to.

The pressure impartingsleeve 13 'is provided at its forward end with a flare or flange 24 which, when the door is in the closed condition, is located in the vicinity of, but with a clearance axially from, the collar 22 of the latch bolt 18, and remains ina correspondingly formed recess 25u-inuthelatch 14 and spaced from the wall of this recess. A pressuretransmitting disc 27 bears against a bossed central portion of the latch 14 and transmits thereto the force of closure spring means 28, in the form of asetof plate springs, which is applied under pressure against this disc 27. With the door in the closed condition described, the inner end of the pack of fastener springs is also applied against a shoulder 29 formed on the boss 12.

The fastener springpack is surrounded by a cylindrical extension 30 of the bearing 10 forming a housing for the springs, this part 30 being provided, at a plurality -of .places, with :longitudinal slots 31. A locking or safety screw-32, which is screwed into a t'ap'ped hole 33 in the boss 12, passes through'one 'of the longitudinal slots 31 and has a-bore 34 through which is passed a pin 35. This pin -35 is surrounded by a compression spring 36, located -in an annular gap 37 between the pin 35 and theinner wall of the bore 34, and the spring is applied atone end 38 against the body of the locking screw 32 and at the other end "against a plunger head 39 on the pin 35. The outer end of the head 39 is shaped in conformity with the annular groove '21 in the stem-20 of the latch screw bolt 18.

At its end opposite to head 39the pin 35'is provided with a hand grip 40=which is disposed in a recess 41 in the body of the locking screw32, the latter also having, transversely disposed in relation to the recess 41, a

further recess or groove 42 in which the hand grip '40 can be disposed to retain it when it is retracted to withdrawand hold the pin head39 out of the annular groove 21 in the stem 20 of the latch screw bolt 18.

When the pin 35 and its head 39 are in the condition illustrated in the drawings with the head in the groove 21, the latch screw bolt 18 is held against axial displacement. In thenormal operation of the door, compression *of the fastener springs 28 is effected automatically, for the purpose of unl'atching the door, by axial movement of the pressure sleeve. 13 by a pressure-applying means, not

illustrated =in-the -drawing,;which acts to impart a thrust,

on the flange 24 of sleeve 13. The last mentioned motion, which is taken by sleeve 13, as a result of the thrust then applied, is greater than the clearance 26 in the recess 25, between the fastener latch 14 and the flange 24 of the sleeve 13, so that the latch 14 is somewhat retracted from the position in which it leans against the latching hooks 15. This enables the latch 14 to 'be rocked on sleeve 13 and the door 1 to be withdrawn from the mouth of the oven chamber 3.

For hand latching and unlatching, when required, for example in the event of failure of the above indicated pressure means for automatically operating on the sleeve 3 13, a key is applied for operation by hand to the head 23 of the latch screw bolt 18, and the pin head 39 is withdrawn from the annular groove 21 of said latch screw bolt 18. Turning of the key rotates screw bolt 18 axially inward until collar 22 presses sleeve '13 in to take the pressure of springs 28 off latch bar 14 and hence off hooks 15. When latch 14 is out of hooks 15, and sleeve end 24 is not held in, by means applied to head 23, or part 24, the bevelled collar 22 arrests the outward movement of sleeve end 24, and hence, also the outward movement of disc 27, and springs 28.

The closure pressure exerted by the fastener springs 28 is set by adjusting the position of the boss 12 in its hearing 10, which adjustment is done by means of a key engaged of the end 16 to rotate the boss in or out. To permit this to be done, the locking, or safety screw 32 has to be screwed out of the tapped hole 33 in the boss to permit such adjustment, and in addition the latch screw 18 is then removed so that the latch 14 and the pressure imparting sleeve 13, which must likewise be movedaway from the boss 12, may be removed when the latch screw 18 has been removed to permit access of the key to the end 16. The locking screw 32 can readily be screwed out of tap 33, by means of the hand grip 40, into a position to permit this adjusting operation.

With the door in closed condition, the pressure disc 27 forms, with the latch bar 14 and hooks 15, a bar to the expansion of the spring means 28 in the absence of sleeve 13 and bolt 18, and the shoulder 29 and the locking screw 32 can readily be reset in relation to the bearing to alter the tension of springs 28.

When the boss 12 has been adjusted, the pressure sleeve 13 and the latch 14 are inserted and the locking screw 32 screwed into the recess 33 in the boss 12, the head 39 of this screw projecting into the bore 17 of the boss 12. The latch screw bolt 18 is next screwed into the boss 12 until the rounded head 39 of the safety screw, which slips over the bevelled end of the latch screw bolt 18, is forced into the annular groove 21 and further axial movement, and hence further rotation of the latch screw bolt 18 is made impossible. In this way the latch screw bolt 18 is brought into the adjusted position required for axial displacement of the pressure ring 27 for the purpose of compressing the fastener springs to the extent required for sealing.

What I claim is:

1. Door fastener operating means for eifecting the latching and unlatching of the doors of horizontal coking chambers, or other ovens, in which a door part is adapted to be held against a door frame for the door under spring pressure of spring means applied between a latch and the door part when the door is closed, and in which said door fastener operating means comprising a boss which carries the latch and which is axially adjustable in a bearing that is fixed relative to the boss for adjusting the tension of the spring pressure exerted on the latch in latching thedoor, and a latch screw bolt axially adjustable in said boss and having a counteracting Surface disposable, on axial adjustment of the latch screw bolt, into position for exerting a counterfor-ce on the spring means in unlatching' the door to overcome the spring pressure exerted on the latch as aforesaid.

2. Door fastener operating means for the doors of horizontal coking chamber, or other ovens, comprising a fixed bearing carried by the door, a boss member carried by said bearing 50 as to project forwardly therefrom, a latch screw member engaged in said boss so as to be axially movable relatively thereto, compression spring means arranged between said boss member and a portion of said latch screw member, and a latch mounted around said latch screw member with said latch interposed in the path of pressure between the spring means and said portion of said latch screw member.

3. Door fastener operating means according to claim 2,- including a locking screw carried in said fixed bearing and detachably engageable with the boss to prohibit axial movement thereof in the bearing.

4. Door fastener operating means according to claim 3, in which the locking screw is adapted also to engage said latch screw member and hold it against axial displacement relatively to said boss.

5. Door fastener operating means according to claim 4, in which the latch screw member comprises an annular groove for coaction with the locking screw, and in which said locking screw comprises a spring-loaded pin passing therethrough having a head for sliding engagement in the annular groove in the locking screw.

6. Door fastener operating means according to claim 5, in which said pin comprises a handle operable to withdraw the pin head from the groove of the latch screw member, and in which the body of the locking screw is formed with means for restraining engagement of the withdrawn pin so as to hold the latter in its retracted position against the spring action.

7. Door fastener operating means according to claim 2, and which further includes a pressure sleeve interposed between said portion of the latch screw member and said spring means for imparting pressure from the spring to the latch screw member and from the latch screw member to the spring, said sleeve also being disposed between said boss and the latch and being capable of axial displacement relative to the boss and the latch, when the door is in closed condition, to exert pressure on the spring means on axial adjustment of the latch screw member to the sleeve.

8. Door fastener operating means according to claim 7, in which the sleeve is provided with a member to abut the latch, on axial movement of the sleeve, with a clearance between the abutting member of the sleeve and the latch, which clearance is less than the distance of axial travel normally required of the sleeve to compress the spring means in unlatching the door.

9. Door fastener operating means according to claim 8, in which the closure spring means is mounted between a shoulder on said boss and a disc which is applied against the latch in the closed condition of the mechanism.

'10. Door fastener operating means for the door of a horizontal coking oven according to claim 7, and in which the sleeve is also accessible to auxiliary mechanical means for operation thereby for compressing the closure spring means independently of its operation by said latch screw member.

References Cited in the file of this patent UNITED STATES PATENTS

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