US2753200A - Apparatus for unfastening spring latched coke oven doors - Google Patents

Description

F. DOLL ET AL Figed June 25, 1955 0.1 www.

IIII

APPARATUS FOR UNFASTENING SPRING LATCHED COKE OVEN DOORS July 3, 1956 `ed States atent Oce 2,753,200 Patented July 3, 1956 APPARATUS FOR UNFASTENING SPRING LATCHED COKE OVEN DOORS Franz Doll and Gunther Brandenbusch, Essen, Germany, assignors, by mesne assignments, to Koppers Company, Inc., Pittsburgh, Pa., a corporation of Delaware Application June 23, 1955, Serial No.- 517,624 Claims priority, application Germany August 30, 1954 2 Claims. (Cl. 292-1) The present invention is a continuation improvement of the common assignees main invention of U. S. Patent 2,668,075, which relates to an apparatus for loosening coke oven doors having closing springs arranged between the door body and the closing latch bars wherein the latch is released by compressing the closing spring by means of a pressure device eifectively connectible with the door body in such manner that the forces for release are applied independently of the door and of the frame of the service machine, by a closed power means or lock acting on the closing springs and transferring the reaction pressure of the release forces back onto the springs.

According7 to the main invention the pressure device is formed of a bellows of stretchable material or a multiply folded, stretchable sheet metal housing, or other extensible motor.

By the present invention the improved apparatus of the aforesaid patent is provided for compressing the closing springs for the purpose of loosening coke oven doors by means of a pressure device consisting of a piston motor as in the common assignees copending applications Serial No. 297,433, led July 7, 1952, and Serial No. 407,124, filed January 29, 1954. Thereby the apparatus of the main patent is continued here as thus improved, adapted and perfected insofar as now the extensible motor in the form of a bellows of stretchable material which is subjected to considerable strain when on the coke oven doors, rather than on their door machines, is eliminated.

According to the present invention the annular ring as commonly used in said copending applications for effecting the compression of the latching spring is connected with the piston of the motor which also serves for closing the front of the motor housing, instead of with the housing as heretofore. The solid wall closing the rest of the motor housing is instead changed to be connected with the latch bolt on the door, for grasping the bolt, by means of the axially movable shaft with the shaft intersecting the piston of the motor which now presses on the latch spring by means of the iluid pressure media introduced in the space between the solid rear Wall of the motor housing and the piston, an active pressure is produced on the springs by the pressure ring on the latch bolt and a reaction pressure in the opposite direction on the bolt for the latch is concurrently produced in such manner that the closed power means or lock results in which the force acts neither on the frame supporting the apparatus nor on the door body,

A further and main object of the invention is to have a quicker acting operation in respect of Withdrawal of the device on relatching the door with a longer life and more certainty in sealing the oven doorways for coking. In

addition to the prior operation of the so far perfected main invention the piston motor operates doubly in a manner such that the shaft that is now connected with the motor housing and which acts on the latch bolt is tightly sealed in the pressure ring which acts on the spring, as by being movably arranged in a cylindrical extension of the piston. In this way, independently of a support spring provided according to the main patent apparatus, the pressure ring and the grasping latches of the device are brought into the initial position for locking of the door with safety and the grasping latches are swung completely out of reach of the latch bar bolt on the door.

The invention further provides for holding the piston motor tight against creeping when operated with a high pressure by arranging sealing rings of soft material on the oppositely movable surfaces of the piston motor, said sealing rings being so formed that they effect a tight seal under the action of the fluid pressure medium introduced to reciprocate the pistons.

The invention is illustrated in the accompanying drawings of the now preferred embodiment:

ln Fig. l the device is shown above the center line thereof as it appears in operation in its uncoupled position when advanced alongside the latch bolt of the door;

ln Fig. 2 the device is shown underneath the center line thereof as it appears in its coupled position, both views being in vertical longitudinal section; and

ln Fig. 3 another modication of the piston sealing device is shown on enlarged scale.

Fig. 4 is an enlarged portion of a part of the device as shown in Fig. l;

Fig. 5 is an enlarged portion of a part of the device as shown in Fig. 2.

The apparatus forming the piston mo-tor consists of a motor housing formed by the rear wall 17 and the cylindrical jacket 17a. The front side S0 of housing 17, 17a is closed by the piston 51 movably arranged in the housing.

The rear wall 17 of the housing is connected by means of several rods 52 with the wall of a supporting frame 2 of the door operating machine of the apparatus which moves from oven chamber to oven chamber. Rods 52 are constructed spherically at the one end at 53 and are thereby flexibly arranged on all sides in universal joint housing 54 which is screwed into the rear wall 17. The other end of eachrod is flexibly connected with the frame 2 of the door machine by means of spring 10 and nut 54. By this arrangement a parallel motion is provided which effects a secure connection with the latch bolts 30 of different doors of an oven battery, even when the door machine apparatus is not in an exactly concentric position therewith.

Piston 51 is connected with the flange 55 of a cylindrical pressure ring 33. Piston 51 has a cylindrical extension 56 which is concentrically arranged inside the pressure ring 33 and is tightly sealed at its outer extremity along a short length. The inner surface of the cylindrical extension 56 of piston 51 is constructed in the form of a piston cylinder in such manner that the piston 51 is movable reversely by fluid pressure on a piston like extension 57 of shaft 21.

Piston S1 is intersected by shaft 2l on which the piston 51 is also reciprocally movable. Shaft 2l has a shoulder S3 firmly tted against the front face of the rear wall 17 of the piston motor housing and seats axially in the rear wall 17. Shaft 21 is txedly connected with the wall 17 by means of a nut 34 on the rear face thereof.

A sealing ring 59 is arranged in a groove on the outer circumference of the rear end of piston 51, and has a rearwardly opening lateral annular groove 60. The axially extending side limb of an annular angular band 61 is pressed in this rearwardly opening axially extending annular groove 60 by means of an annular band 64 screwed on piston 51. Band 64 has channels 65 which receive the pressure media for operation of the piston 51 supplied by means of boreholes 66 in the band 61. Thereby the side walls of the annular groove 60 of sealing ring 59 are pressed tightly radially against the cylinder jacket 17a as well as against the piston 51.

For unlatching a coke oven door, pressure medium of the fluid type is introduced through a borehole 67 of the housing rear wall 17 into space 68 between the front face of the rear wall 17 and the rear face of piston 51. Sealing means 69 are arranged in similar manner 0n both the front and rear ends of piston 51 of the circumference of shaft 21 and also on the piston like extension 57 of shaft 21 adjacent the cylindrical extension 56 of piston 51.

For latching the coke oven doors the pressure medium is introduced in space 70 between the piston like extension 57 of shaft 21 and piston 51 through an axial borehole 71 of shaft 21 and a radial borehole 72.

The left front end of shaft 21 terminates in a cylindrical guide 73 which, on sliding the device on latch bolts 5, encloses head 30 with play. Grasping latches 13 swingable on articular bolts 39 engage in an annular groove 28 of the door latch bolt and surround the end piece 73 of shaft 21. Near articular bolts 39, springs 46 are arranged on latches 13, said springs 46 being arranged in the uncoupled position, as apparent from Fig. 1, against the end of ilexible bolts 45 arranged in a housing 77 in such manner that they hold latches 13 in turned out position.

As apparent in' Fig. l, after sliding the ring 33 outwardly from the head 30 of bolt 5, the piston 51 lies against the rear wall 17 of piston motor housing. When compressed air is introduced through opening 67 into the space 68 of the piston cylinder, the pressure ring 33 is moved inwardly against the hub 32 of latch bar 6 on the door, whereby, as seen in Fig. 2, spring 46 is out of the reach of bolt 45. The flexible bolts 45 glide over the grasping latches 13 and press the latter down in the annular groove 28 of bolt 5. At the same time the pressure of the pressure medium introduced in space 68 of the piston motor acts against the front face of rear wall 17, whereby the latter compresses somewhat the springs of rods 52 against the frame 2. The reaction pressure exerted outwardly against the rear wall 17 of the motor housing and the action pressure exerted inwardly against the piston 51 result in a pulling effect of latches 13 on inner groove wall 41 of head 30 of bolt 5 and the door, against the spring for the latch bar, and, in a pushing effect of pressure ring 33 against that spring by the hub 32 on bolt 6, so that a closed power means or lock results on the latch bar closing springs of the door whence the latch bar can be loosened for swinging the latch bars 6 out of the latch hooks, without forces being sent on through the door to its frame or to the door machine 2.

In the restoring of the sealing pressure, spring 46 is again pushed against by the flexible arranged bolts 45 under the action of the pressure medium from 71 when introduced in the space 70 between piston 51 and piston 57, as apparent from Fig. 1. grasping latch or hook 13 from the annular groove 28, whereby the operating device as a whole is withdrawn with the frame Z from bolt 5. This releases the power lock on the spring for the latch bar 6 which is then under force, of that spring.

Channels 78 through which a lubricant means is intro- The spring thereby lifts the duced lead to the gliding surfaces of the various pistons and cylinders.

The piston sealing rings 69 can, as apparent from Fig. 3, consist of a sealing ring 80 made of soft material and provided with annular border ribs 82. Sealing ring 80 lies in the annular groove of a band 81 pushed on the piston 51 and is fastened by a band 64 screwed on the piston. The annular border ribs 82, lie against the wall of the cylindrical jacket 17a of the motor housing. The pressure medium acting on sealing ring 80 through channel of ring 64 and opening 83 of ring 81 effects a continuous fitting of the annular border ribs 82 against the cylindrical wall 17a.

I claim:

l. Apparatus for tightening and loosening coke oven doors, comprising: springs arranged between the body of a coke oven door and a closing latch bar on a bolt on the door, a pressure device detachably connectable with the door, comprising, a double piston motor comprising a housing with a cylinder wall, a rear Wall integral with the cylinder wall, and a first piston which forms the front wall of the housing, a pressure ring connected with said first piston for effecting the compression of the spring, a shaft fast to said rear wall and going through said first piston and provided with a grasping latch for grasping the bolt of the latch bar operated by said spring, said grasping latch and pressure ring being movable in opposite directions, on operation of said first piston away from said rear Wall of said housing, to compress the spring in unlatching the door; means operable by the pressure ring to press the grasping latch onto the bolt, on movement of the first piston away from said rear wall of the housing, and means operable by the pressure ring to lift the grasping latch from the bolt, on movement of the first piston toward said rear wall of the housing; a second piston fast to the shaft between the first piston and the grasping latch on the shaft, said second piston being tightly sealed inside the pressure ring against a cylindrical extension integral withand between said ring and said first piston, said cylindrical extension and first piston, and saidl second piston and'shaft, being movable in opposite directions simultaneously, on operation of the cylindrical extension 'and first piston towards said rear wall of said housing, to hold the grasping latches out of grasping relation with the latch bar bolt during movement of the piston motor away from the door after latching the same.

2. Apparatus of claim l and in which self sealing rings made of soft material are arranged on the movable contact surfaces of the pistons of the piston motor, which sealing rings are provided with retainer rings having ports therein opening to the sealing rings and under the iniiuence of the same fluid pressure medium that vacts on the pistons to move the same, for flow of said fluid pressure medium against the sealing rings to hold them tight.

References Cited in the file of this patent UNITED STATES PATENTS 2,190,297 SalkVist Feb. 13, 1940 2,216,433 Conner Oct. 1, 1940 2,622,315 Loveland Dec. 23, 1952

Claims (1)

1. APPARATUS FOR TIGHTENING AND LOOSENING COKE OVEN DOORS, COMPRISING: SPRINGS ARRANGED BETWEEN THE BODY OF A COKE OVEN DOOR AND A CLOSING LATCH BAR ON A BOLT ON THE DOOR, A PRESSURE DEVICE DETACHABLY CONNECTABLE WITH THE DOOR, COMPRISING, A DOUBLE PISTON MOTOR COMPRISING A HOUSING WITH A CYLINDER WALL, A REAR WALL INTEGRAL WITH THE CYLINDER WALL, AND A FIRST PISTON WHICH FORMS THE FRONT WALL OF THE HOUSING, A PRESSURE RING CONNECTED WITH SAID FIRST PISTON FOR EFFECTING THE COMPRESSION OF THE SPRING, A SHAFT FAST TO SAID REAR WALL AND GOING THROUGH SAID FIRST PISTON AND PROVIDED WITH A GRASPING LATCH FOR GRASPING THE BOLT OF THE LATCH BAR OPERATED BY SAID SPRING, SAID GRASPING LATCH AND PRESSURE RING BEING MOVABLE IN OPPORSITE, DIRECTIONS, ON OPERATION OF SAID FIRST PISTON AWAY FROM SAID REAR WALL OF SAID HOUSING, TO COMPRESS THE SPRING IN UNLATCHING THE DOOR; MEANS OPERABLE BY THE PRESSURE RING TO PRESS THE GRASPING LATCH ONTO THE BOLT, A MOVEMENT OF THE FIRST PISTON AWAY FROM SAID REAR WALL OF THE HOUSING, AND MEANS OPERABLE BY THE PRESSURE RING TO LIFT THE GRASPING LATCH FROM THE BOLT, ON MOVEMENT OF THE FIRST PISTON TOWARD SAID REAR WALL OF THE HOUSING; A SECOND PISTON FAST TO THE SHAFT BETWEEN THE FIRST PISTON AND THE GRASPING LATCH ON THE SHAFT, SAID SECOND PISTON BEING TIGHTLY SEALED INSIDE THE PRESSURE RING AGAINST A CYLINDRICAL EXTENSION INTEGRAL WITH AND BETWEEN SAID RING AND SAID FIRST PISTON, SAID CYLINDRICAL EXTENSION AND FIRST PISTON, AND SAID SECOND PISTON AND SHAFT, BEING MOVABLE IN OPPOSITE DIRECTIONS SIMULTANEOUSLY, ON OPERATION OF THE CYLINDRICAL EXTENSION AND FIRST PISTON TOWARDS SAID REAR WALL OF SAID HOUSING, TO HOLD THE GRASPING LATCHES OUT OF GRASPING RELATION WITH THE LATCH BAR BOLT DURING MOVEMENT OF THE PISTON MOTOR AWAY FROM THE DOOR AFTER LATCHING THE SAME.

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