US1029134A

US1029134A - Baker's oven.

Info

Publication number: US1029134A
Application number: US68119312A
Authority: US
Inventors: Friedrich Kuehtz
Original assignee: Individual
Current assignee: Individual
Priority date: 1912-03-02
Filing date: 1912-03-02
Publication date: 1912-06-11
Anticipated expiration: 1929-06-11

Description

F. KfiHTz.

BAKER'S OVEN.

APPLICATION IILED MAR. 2, 1912.

1,029,134, Patented June 11,1912.

3 Fig.1

A /M; ammwa 7 COLUMBIA PLANOURAPH C0,. WASHINGTON, D. c.

rninnnrcn Knrrrz', or CANNSTATT-ISTUTTGART, GERMANY.

BAKERS OVEN.-

, Specification of Letters Patent.

Patented June 11, 1912.

Application filed March 2, 1912. seven No. 681,193.

To all whom it may concern:

Be it known that I, FRIEDRICH Kt'uirz, a subject of the King of Prussia, German Emperor, residing at Cannstatt-Stuttgart, in the Empire of Germany, have invented a new and useful Bakers Oven, of which the following is a specification.

My invention relates to bakers ovens with portable hearth adapted to open and to close a trap-door on being pushed in and consists in a mechanism operated by the hearth for again opening the trap-door and keeping the same in the open state on the hearth being withdrawn.

I will now proceed to describe my invention with reference to the accompanying drawing, in which Figure 1 is a vertical longitudinal section through the baking chamber of a bakers oven and shows the trap-door in its closed state and the portable hearth pushed in. Fig. 2 is the left part of this chamber and shows the trap-door in its open state and the rear part of the portable hearth beneath the door. Fig. 8 is a vertical cross section through a part of the baking chamber and a rear view of the portable hearth and the open trap-door, parts being shown in section, and Fig. 4 is ahorizontal section through this part of the baking chamber and a plan view of the parts shown in Fig. 2, a part of the trapdoor being broken away.

Similar characters of reference refer to similar parts throughout the several views.

11 denotes a rectangular baking chamber of a bakers oven of any approved construction (not shown). A trap-door 1 is at the ends rigidly connected with two pivots 2 which are mounted to turn in a furnace front 12 and carry without weighted arms 3 for partly balancing the trap-door. The weighted arms 3 are so disposed as to normally press the trap-door 1 against the inner edge of the opening 18, as is clearly shown in Fig. 1. The furnace front 12 is assumed to be provided with apertures in which two parallel movable rails 8 of a U shaped cross section are guided. The front ends of the two movable rails 8 may be connected together bymeans of a bent handle 14: so to form a frame which can be pushed inward and drawn outward by means of the handle. The rear ends of the two movable rails 8 are shown to be provided with a long slot 15 in which the ends of a shaft 16 engage. On this shaft 16 are fastened two wheels 17, which are adapted to roll on two parallel rails 18 (Fig. 23) secured in the bottom of the chamber 11. It is to be noted, that during the longitudinal motion of the rails 8 the outer ends of the shaft 16 are to roll on the upper inside of the two slots 15, so as to render every lubrication unnecessary. On account of the ratio between the wheel 17 and the shaft 16 the travel of the wheel is much longer than the length of the slot 15. Each rail 8 is on its upper surface provided with ledges 19, 19 forming races for two

balls

20, 20. On these balls a rectangular hearth or pan 7 is made to roll, it being provided on its lower side with ledges 21, 21 forming races in which the balls engage. The rear border of the hearth 7 is provided with a known inclined arm 9 carrying a roller 10, which latter is adapted to hold the trap-door 1 in its opened state, as is clearly shown in Figs. 2 and 3. On either side wall of the baking chamber 11 is fastened a suitable support 22 (Fig. 1) for a pin 23, on which pin a cam 6 is mounted to rock. The trap door 1 is on either side rigidly connected with an arm 4, which projects inward and is pivotally connected with the cam 6 by means of a rod 5. Suitable recesses 24 may be provided at the front in the top of the chamber 11 for p er mitting the arms 4 and the rods 5 to move. The cam or cams 6 are adapted to ride over the side borders of the hearth 7 (Fig. '2). The front ends of these side borders and the lower ends of the cams 6 are rounded, as is clearly shown at Fig. 1.

The mechanism described operates as fol lows: After the hearth or pan 7 has been charged with fresh wares without the oven, the hearth is pushed inward in the direction of the dotted arrow 6 in Fig. 1, so that its rear border strikes the door 1 (as is indicated'by the dotted lines in Fig. 1) and partly opens it, whereupon the door sliding first over the inclined arm 9 and afterward over the roller 10 is completely opened and kept in this position (Fig. 2). It will be seen, that the trap-door 1 has by the parts 4: and (3 raised the cam or cams 6, so that the rear border of the hearth 7 can readily engage first beneath the rounded ends and afterward beneath the straight edges of the cams 6. Then the handle 14 is pushed toward the oven, so that the rails 8 supported by the wheels 17 move inward and when the

balls

20, 20 strike the front ends of their races on the rails, the hearth 7 will be taken along with the rails by the balls. As long as the cams 6 ride over the horizontal edges of the side borders of the hearth 7 the door 1 will be prevented from closing. Then the frame 14:, 8 has been fully pushed inward, the trap-door 1 still remains open, since the front end of the hearth is still beneath it. It will be then necessary to temporarily press with the hand on the weighted arm 3 for holding the door 1 in its open state and to push the hearth 7 further inward, whereby the cams 6 are released, so that the arm 3 can be turned toward the oven for closing the door 1. After the wares have been exposed to the heat for a sufficient time, the handle 14; is seized and drawn out in the direction of the arrow (4 in Fig. 1, so that the rounded front ends of the side borders of the hearth 7 strike the cam or cams'6 and raise them for opening the door 1, whereupon the roller 10 on the inclined arm 9 can freely move under the door 1 (Fig. 2)

The mechanism described can be varied in many respects without departing from the spirit of my invention. On the drawing the trap-door 1 is shown to open inward,

Where so preferred, the door may be made to open outward, in which case the mechanism requires to be slightly modified, the arm 4: being placed on the left side of the pins 2 in Fig. 1 andthe rod 5 being suitably lengthened or the pin or pins 23 being shifted to the front, while the weighted arm or arms 3 are of course placed on the left side of the pins 2 in Fig. 1.

Evidently springs, buffers or the like may be provided where necessary for softening any blow during the opening or closing of the trap-door.

\Vhere so preferred, the arm 1 may be replaced by a toothed segment and the rod 5 may be replaced by a second toothed segment meshing with the first segment and rigidly connected with the cam 6.

I claim: 7

1. In a bakers oven, the combination with a movable pan adapted to be pushed into the baking chamber and to be withdrawn therefrom, of a trap-door adapted to open and to close the baking chamber, a cam adapted to rock in the baking chamber and to be raised by said pan during the withdrawal, and means for so connecting said cam with said door as to cause both of them to simultaneously move.

2. In a bakers oven, the combination with a trap-door adapted to open and to close the baking chamber, of a pan adapted to be pushed into the baking chamber and to be withdrawn therefrom, means on said pan for opening said trap-door on the pan being pushed in, a cam adapted to rock in the baking chamber and to be raised by said pan during the withdrawal, and means for so connecting said cam with said door as to cause both of them to simultaneously move.

3. In a bakers oven, the combination with a furnace front, of a trap-door mounted in said furnace front to rock about an upper axis for opening and closing the baking chamber, a cam adapted to rock in the baking chamber, means for so connecting said cam with said trap-door as to cause both of them to simultaneously move, a pan adapted to be pushed into the baking chamber under said cam when raised and to engage behind said cam when lowered, and an arm with a roller at the rear end of said pan adapted to strike and to open said trap-door, said cam being adapted to be raised by said pan during the withdrawal.

4. In a bakers oven, the combination with a furnace front, of a trap-door mounted in said furnace front to rock about an upper axis for opening and closing the baking chamber, a supporting frame comprising two parallel rails guided in said furnace front at right angles thereto and a handle connecting the front ends of the rails, said parallel rails having each at the rear end a longitudinal slot and on the top two longitudinal recesses, a cross shaft engaging in the longitudinal slots of said two rails, two wheels on said shaft adapted to roll on the bottom of the baking chamber, four balls adapted to roll in the longitudinal recesses of said two rails, a pan adapted to roll on said four balls and to be pushed into the baking chamber and to be withdrawn therefrom, an arm with roller at the rear end of said pan adapted to strike and to open said trap-door, a cam adapted to rock in the baking chamber and to be raised by said pan during the withdrawal and to drop behind the pan at the end of the inward motion, an arm'on said trap-door, and a rod pivotally connecting said cam with said arm whereby said trap-door and said cam are caused to simultaneously move.

FRIEDRICH KUHTZ. Witnesses:

VVOLDEMAR HAUPT, HENRY HASPER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.