DE6915769U - DEVICE FOR HEAT TREATMENT WITH A DOOR OPERATED BY A LEVER MECHANISM - Google Patents

Description

Hanau, April 18, 1969 PA-Dr. Pr / Cl

WC Heraeus GmbH
Hanau / Main

Utility model registration

"Device for heat treatment with dureh Lever mechanism of actuatable door "

The present Erfiadaag fcezielat look on ice transportable Device for the thermal treatment of goods, in particular on Electrically heatable muffle furnaces, crucible furnaces, dry closets or the like. The door of which is moved by pivoting levers in such a way that Inside exterior 1-Iche in the open state in front of your work space can serve as a work table.

Oven doors are known that are guided by levers that move in parallel or by a chain drive so that the heated door surface is facing away from your workplace when the door is open. The German patent specification 684 teeetireubb a door fix muffle furnace -: 1t two pivot levers on the upper and lower door in such a length ratio to each other that the outer plate of the T'ar in the open position facing upwards in front of the door opening of the furnace, with the ⁷ EIIx- serving as a working iron. Muffle furnaces with this type of door have long been hairy, but the demands on the temperature profile in the work area and the load capacity of the work area are meanwhile

open door serving at the table increased considerably, so that they no longer met all requirements. Due the guidance of the door with the help of the two swivel levers, it was inevitable to bevel the door stone at its lower end, which naturally has a strong temperature gradient in the Work space towards the door. The operating lever according to the cited German patent specification 684 170 is designed as a counterweight to facilitate movement of the door. The work table in the form of the open The door tends to tip over, especially when there is a load on the outer end, which makes working on this table considerably more difficult.

The present invention is based on the stated disadvantages of the temperature gradient, the unwieldy To avoid counterweight and the possibility of tipping.

This task is achieved with a device for heat treatment, in particular electrically heatable muffle furnaces, crucible furnaces, drying cabinets or the like, with a heated work space located in its housing, which is closed with a door which can be moved by pivoting levers attached to the upper and lower ends of the door the outside of the door, in the open position facing upwards , comes to lie in front of the door opening of the work room, solved according to the invention in that a pivot lever connected to the lower end of the door consists of two pivot arms of different lengths, one end of the shorter pivot arm on the lower one Törende and one end of the longer Sehwenkarmes is attached to the housing and the remaining ends of both Senwen ^ arse rotatably with each other and via a connecting

leg with the swivel lever attached to the upper end of the door are rotatably connected in about half its length, the other end of which is firmly connected to an actuating lever », is attached to the housing. Further inventive features emerge from the following description of the in the preferred exemplary embodiment shown in FIGS. 1 and 2.

Figure 1 shows schematically a device for heat treatment with a closed Door and the pivot lever assembly according to the invention

Figure 2 shows a detailed drawing of the construction with the door division open represent

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The subject according to the invention will now be explained in more detail with reference to FIGS. 1 and 2.

FIG. 1 shows the working space A which is surrounded by a housing 1 and the heating elements and is closed by the door 3 and into which the material to be heated is introduced. The pivot lever, which is rotatably attached to the lower end of the door at point 5, consists of two different long pivoting carts 6 and 7, which are in the. Point 8 are rotatably connected to each other. The swivel arm 6 is rotatably attached to the housing 1 at point 5 with the lower edge of the door 3 _{5 of} the swivel arm 7 and point 9, in the exemplary embodiment via a holder 17. The pivot point 8 is through, a Yerbiiidungsseiikei 10 with the Breh-

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point 11 connected approximately in the middle of the pivot lever 12; this is fastened in the pivot points 13 on the housing and 14 on the upper end of the door in the exemplary embodiment via a holder 18. The operating lever 15 is firmly connected to the pivot lever 12 at the pivot point 13 and does not carry a door weight, as in the case of the door of German patent 684 170, but only a handy, light operating head 16. In the closed state, the upper pivot point 14 is somewhat closer at the work space 4 as the lower pivot point 13; therefore the door is pressed firmly against the opening in the housing by its own weight, it closes for the same reason even after opening slightly. The connecting leg 10 is about 5 to 25 T, preferably 10 to 20 f., longer than the pivot lever 12th

With such a construction it is now achieved according to the invention, that the door is led out of the opening of the work area over a large distance approximately horizontally. This has the consequence that the heat-insulating door block 19, the so-called door stopper, in a manner that meets the requirements Thickness can be used and only slightly beveled at its lower end facing the work space is. This results in a previously unattained low temperature drop achieved in the work area towards the door.

FIG. 2 illustrates the position of the door 3 after the device for heat treatment has been opened, its actuation. Lever 15 is pivoted about 180 ° from its starting position when the door is closed. The way of attaching the Pivoting levers and their connection with one another make the door tilt even when loaded by the load on the front edge in contrast to the door according to the specified German patent 684 170 -not possible.

Claims (4)

Protection claim 1. Device for heat treatment, in particular elekxriscn behei.barer muffle furnace, crucible furnace, drying cabinet or the like, with a heatable working space in its housing, who is closed with a door, V7eleiie through Sehsenkleöel attached to the upper and lower end of the door can be moved in such a way that the outside of the TIIr is open Position naca upside down comes to lie in front of the door opening of the work room, thereby marked, that the pivot lever connected to the lower end of the door from two different length mustard arms (6, 7) oestent, one end of the shorter pivot arm (6) at the lower end of the door and one end of the longer Sehv / enkar— mes (7) is attached to the housing (l) and the remaining Ends of both swivel arms rotatable with each other and via a connecting leg (10) with the one at the top Door end attached rocker arm (12) are rotatably connected in approximately half its length, the other end with which an actuating lever (15, 16) is firmly connected, is attached to the housing (1). 2. Device for heat treatment according to claim 1, characterized in that the connecting leg (10) is about 5 to 25 a> preferably 10 to 20 "f. Longer than the pivot lever (12) attached to the upper end of the door. 3. Device for heat treatment according to claims 1 and / or 2, characterized in that the work space (4) facing door side with a relatively thick TLLrstein (19) is provided, the underside of which on the in the working space (4) protruding, the door down The end is slightly beveled. 4. Provision for heat treatment according to or more expensive of the preceding claims, characterized in that When the gate (3) is closed, the pivot point (14) of the with the swiveling lever connected to the upper end of the door (12) on the door in the direction of the work area behind the pivot point (13) is, mit.dea the operating lever (15) is connected. 5- device for the treatment after, at least one of the preceding claim, characterized in that when the door is open, the actuating lever (15, 16) uin about 180 ° is pivoted relative to its position with the door closed. ftl