EP1223384B1 - Locking device for fire door - Google Patents

Abstract

The combustion chamber door (13) is subjected to restoring torque for automatic closure and is swivel mounted in a combustion chamber housing (1). A locking shaft (21) has locking catches gripping behind U-shaped elements on the combustion chamber door. In a locked position, the closed combustion chamber door is locked to the housing. In an open position the lock is released by a release-lever (27) on the locking shaft.

Description

The invention relates to a firebox door closing device, in particular for Stoves, with a firebox housing and a pivotally housed therein acted upon for self-closing resetting torque Fire door.

Such a mechanism is known in firebox doors of stoves. For example, by means of hinged, biased Coil spring spring-loaded firebox door ensures that after the opening of the furnace door is closed automatically. This will be a largely optimal combustion of the fuel in the furnace reached the fireplace. The disadvantage, however, is that a tight closing the Firebox opening solely by the spring force acted upon firebox door can not be achieved with sufficient certainty. There is a danger that toxic fumes enter the living space. Furthermore, there is a risk that with deflagrations in the firebox burning goods through which due to the Overpressure opening firebox door can enter the living room.

From DE 87 08 165 U1 an oven with self-closing door is known the one arranged on the pivot axes of the doors spring-loaded Closing device and at the end remote from the pivot axis of the Door has a locking device. In this case, the Locking device facing the oven interior latch and one projecting beyond the front of the door, with the bolt rotatably connected operating lever on. In this case, the operating lever under Referring to the pivot bearing a higher torque in proportion to the inner latch, which prevents the latch can automatically move back to its closed position. So will too here a self-closing firebox door specified, however, the disadvantageous in its closed position is not automatically locked.

The object of the invention is to specify a firebox door closing device, when an automatic lock when closing the firebox door he follows.

This object is achieved with a furnace door closing device according to Claim 1. By turning the locking shaft can this in their Open position are brought, whereby the locking means unlocked are and the firebox door can be opened. In the automatic Closing the firebox door is then done with the means of triggering the Locking the door locked automatically. The lock becomes a Improved all-round sealing achieved at the firebox door. Toxic gases can not even in unfavorable environmental conditions in the living room reach. In a deflagration in the firebox of the fireplace, the Firebox door does not jump up unwelcome. After closing the firebox door is by the automatic release of the lock no additional Operation that can be forgotten, necessary.

Preferably, the automatic locking of the door is supported by that the locking shaft applied torque for automatic return is formed in the locking position, but in the Open position no restoring moment works.

In a further embodiment it is provided that a control lever frictionally is connected to the locking shaft, on which a torque generating Restoring force is applied so that the resulting on the locking shaft Torque in the direction of the locking position substantially increases, near the open position is zero (dead center) and in the open position acts in this direction to fix this position. This becomes a fixation reaches the locking shaft in its open position, but only a relatively small torque in the direction of the locking position is necessary to move beyond the dead center to an automatic, power-operated Locking lead. Conversely, when unlocked by Rotary actuation of the locking shaft from its locking position in its open position the locking shaft against the return torque turned out over deadline.

A smooth and damped rotary motion of the locking shaft is generated by using a gas spring with damping to generate the restoring torque is provided on the locking shaft.

If the means for triggering the locking of the door on the locking shaft seated release lever is the one from the closing door is pressed and a torque on the locking shaft to overcome the death point near the open position transmits, that is to overcome the dead center near the open position required torque reached and triggered the automatic door lock.

For rotary actuation of the locking shaft is preferably a hand lever intended. With the hand lever that can be used to overcome the restoring torque required torque easily on the locking shaft be transmitted. In a preferably arranged vertically on the stove Locking shaft, the hand lever so frictionally with the locking shaft be connected, that the lever in the open position of the locking shaft strikingly protruding forward from the stove front. An unintentional Leaving the hand lever in the open position is therefore fast noticed.

Characterized in that the release lever is articulated to the locking shaft, that the locking shaft remains only in the open position when the furnace door is opened simultaneously with rotary actuation of the locking shaft, is preferably achieved that accidental leaving the hand lever or the locking shaft in the open position while still closed Firebox door is not possible.

When the locking shaft is disposed on the furnace housing, the required for the locking mechanism moving parts on Firebox housing fixed in place. After a single adjustment of the Movement is a readjustment hardly necessary. By the Arrangement of the locking shaft opposite to the hinge side of the Firebox door will be any pressure forces acting on the firebox door equally part of the rotation stop of the door and the lock added. When the door is closed, the door seal can thus essentially be set at the same load, resulting in a high gas tightness on the door is reached.

When a gas spring articulated via a lever on a non-positive Hinge shaft connected to the firebox door for generating the restoring torque is provided on the firebox door occurs also the door lock in a steady and muted motion. The recognizable for the user movement thus acts elegant. Preferably, the gas spring between an attachment to the furnace housing and the lower lever arranged horizontally or as needed to the horizontal by an angle inclined up to 20 °, whereby the Force acts as effectively as possible and the cushioning safely is activated.

Preferably, the adjusting lever and the torque generating gas spring arranged so that the resulting at the Schwarnierwelle Torque increases towards the closed position of the door. This will be even with a slightly open combustion chamber door to trigger the closing process generates sufficient torque at the firebox door. The movement process is not from the momentum of the fuming fire room door dependent. Preferably, the gas springs are below the combustion chamber floor of the fireplace in the area of the wood tray arranged. Here may under test conditions according to DIN 18891 the temperatures 60 K above room temperature do not exceed. Thermal overloads are thus excluded.

If the means for locking the closed door on the locking shaft frictionally arranged locking catches and on the Firebox associated bow-shaped elements are, wherein in the locked position the locking catches engage behind the stirrup-like elements, a lock of the firebox door is realized at which always one desired pressure applied to the sealing elements. The gas tightness the firebox door is further improved.

Characterized in that the means for triggering the locking of the door is a connecting rod is that between hinge shaft and locking shaft is arranged and hinged by means of levers, which by the Restoring force acts on the closing door via the connecting rod Torque on the locking shaft to overcome the dead center is transmitted near the open position, the triggering of the door lock directly from the torque acted upon hinge shaft of Firebox door reached.

If an operating lever is arranged on the firebox door, the means to solve the locking of the firebox door, and when opening the Firebox door the lock shaft through the at the lock shaft and the hinge shaft hinged connecting rod brought into the open position becomes a handling simplification compared to the execution achieved according to claims 6 and 7. The operator only has to use one Hand grab the operating lever on the firebox door, using Actuation releases the lock and the door is opened.

Characterized in that the connecting rod telescopically with a longitudinal, preferably adjustable game is formed, the connecting rod can so be set that to overcome the dead center position near the Open position on the locking shaft required torque first immediately upon reaching the closed position of the firebox door as a pulling force is transferred, then after overcoming the dead center the Locking shaft in the torque applied and damped Rotational movement free, d. H. regardless of the hinge shaft, turns until the Closed position of the locking shaft is reached. Here is the other one Stop side of the longitudinal, adjustable play on the telescopic reached trained connecting rod. When opening the door then acts the connecting rod as push rod, which is at the door opening rotating hinge shaft directly over the connecting rod the Locking shaft rotated from the closed position to the open position.

Fig. 1

in teilweise aufgeschnittener Ansicht den unteren Bereich eines Kaminofens mit einer ersten Feuerraumtürschließeinrichtung,

Fig. 2

einen Schnitt entlang der in Fig. 1 mit A-A gekennzeichneten Linie mit dem Feuerraum des Kamins,

Fig. 3 a, b, c, d

in Detailausschnitten Bauteile der Einrichtung bei geschlossener Tür,

Fig. 4

Teil des in Fig. 2 dargestellten Schnittes bei geringfügig geöffneter Feuerraumtür,

Fig. 5 a, b, c

Detailausschnitte der Einrichtung bei geöffneter Feuerraumtür,

Fig. 6

eine Ansicht eines Kaminofens mit dargestellter Feuerraumtürschließeinrichtung in einer zweiten Ausführungsform,

Fig. 7 a, b, c, d

in Detailausschnitten eine Verbindungsstange in unterschiedlichen Stellungen beim Funktionsablauf,

Fig. 8 a, b, c, d

in Detailausschnitten zu den in Fig. 7 a, b, c, d dargestellten Funktionsstellungen zugeordnete Positionierungen zweier Gasdruckfedern und

Fig. 9

eine Seitenansicht einer zum zweiten Ausführungsbeispiel gehörenden Türgriffanordnung.

Hereinafter, two embodiments will be described in detail with reference to the accompanying drawings. It shows:

Fig. 1

in a partially cutaway view of the lower portion of a stove with a first firebox door closing device,

Fig. 2

a section along the marked in Fig. 1 with AA line with the firebox of the fireplace,

Fig. 3 a, b, c, d

in detail cut-outs Components of the device with the door closed,

Fig. 4

Part of the section shown in FIG. 2 with the firebox door slightly open,

Fig. 5 a, b, c

Detail sections of the device with open firebox door,

Fig. 6

a view of a stove with illustrated Feuerraumtürschließeinrichtung in a second embodiment,

Fig. 7 a, b, c, d

in detail cutouts a connecting rod in different positions in the functional sequence,

Fig. 8 a, b, c, d

in detail sections to the in Fig. 7 a, b, c, d illustrated functional positions associated positioning of two gas springs and

Fig. 9

a side view of belonging to the second embodiment door handle assembly.

In Fig. 1 is a stove with a fire door closing device according to the invention in a first embodiment with partially cut away Front panel shown. The stove has an unspecified Firebox housing 1 on. In the furnace housing 1 is a furnace 11th (Fig. 2) formed. In the furnace chamber 1 is in front of the firebox 11 a Firebox door opening 12 is provided, into which a firebox door 13 is fitted is.

The firebox door 13 is non-positively connected with a rotatable in the furnace housing 1 held hinged shaft 14 connected. Below the firebox door 13, a lever 15 is attached to the lower end of the hinge shaft 14.

To a self-closing moment on the hinge shaft 14 on the firebox door 13 is transmitted to the adjusting lever 15 is a gas spring 16th hinged. The other end of the gas spring 16 is at an attachment point 17 of the furnace housing 1 set.

As can be seen from the detail views Fig. 3a and 5a, is the lever 15, for example, as on the hinge shaft 14 non-positively pressed Knag, arranged in relation to the attachment point 17, that even when fully open the firebox door 13 by the prestressed Gas spring 16 a restoring torque on the hinge shaft 14th is transmitted. It decreases by increasing emigration of the force line the spring from the axis of rotation of the door the restoring torque in the essentially up to the closed position of the firebox door 14, as shown in FIG. 3 a can be seen. To accumulate the located in the gas spring 16 To reach oil on one side of the gas spring 16 is the gas spring 16, as shown in Fig. 1, at an angle of about 10 ° to the horizontal inclined.

On the hinge shaft 14 opposite side of the firebox door opening 12 is a locking mechanism 2 with a rotatable on the furnace housing 1 mounted locking shaft 21 is arranged. For operation the locking shaft 21 is at the lower end of a hand lever 22 for manual unlocking of the locking mechanism 2 non-positively connected to the locking shaft 21.

The locking shaft 21 is vertically rotatable on the combustion chamber housing 1 stored and extends substantially to about the firebox door opening 12th up. In the area of the firebox door opening 12 are on the locking shaft 21 frictionally secured locking catches 23 arranged. The Verriegelungsknaggen 23 act with associated with the firebox door 13 bow-shaped elements 18 together so that in the locked position of Locking shaft 21, the lugs 23, the associated bow-like elements 18 behind. The firebox door 13 is locked with it. A circumferential Door seal 131 on the firebox door 13 is evenly on the Door opening 12 and seals the combustion chamber in the door area substantially gastight (Fig. 2).

Below the firebox door 13 is a lever 24 frictionally on the Locking shaft 21 attached. On the adjusting lever 24 is a gas spring 25 hinged, with their other end at an attachment point 26 is fixed to the furnace housing 1.

The gas spring 25 and the lever 24 are arranged so that over the majority of the pivoting path of the hand lever 22 is a restoring Moment acts on the locking shaft 21. The arrangement of the gas spring 25 and lever 24 in the locked position of the locking shaft 21 is shown in Fig. 3 b. In Fig. 5b, this arrangement is in the open position, i.e. shown with pivoted forward lever 22. Of the Hand lever 22 and thus the locking shaft 21 is in this position by a over-dead-point mechanism ("jump-gear principle") by a fixed small torque acting in the direction of the open position.

Above the control lever 24 is a release lever on the locking shaft 21 27 freely rotatably arranged over a portion. The release lever 27 directly, however, in a rotational movement of the position shown in Fig. 4 in the position shown in Fig. 3 c, the lever 24 so far with, that the Dead center is overcome and the restoring torque on the locking shaft 21 by gas pressure spring 25 acts. At the trigger lever 27 is an actuating lug 28 attached from the lower frame of the firebox door 13 comes into contact immediately before closing the door.

Hereinafter, an operation cycle of the furnace door closing device will be described described according to the first embodiment.

To open the firebox door 13, the user actuates the hand lever 22, in FIG he with one hand, the lever 22 of his in Fig. 1 and 3 d shown Locking position in the open position shown in Fig. 4 and 5 b pivoted. At the same time, the user opens with his second Hand over door handle 19 the firebox door 13.

When pivoting the hand lever 22 from its locking position is shortly before reaching the dead center of the locking mechanism 2 over a driver of the release lever 27 swung out with actuating lug 28. This is only possible if the firebox door 13 is opened at the same time becomes. If there is no opening of the Feurraumtür 13 jumps the locking shaft 21 goes back over dead center and gets over the gas spring 25 acting restoring force locked again. The hand lever 22 is located Then again in the locking position shown in Fig. 3 d.

However, at the same time with the pivoting operation of the hand lever 22 in its open position (Fig. 4) the firebox door 13 is opened, the hand lever remains 22 and thus the locking shaft 21 in the open position.

After loading the fireplace by the user, the firebox door 13 are let go. The firebox door 13 is over the over lever 15 and gas spring 16 acting restoring moment automatically closed. Shortly before reaching the closed position, the lower frame touches the firebox door 13, the actuating lug 28 of the trigger lever 27 and acts via drivers on the adjusting lever 24 of the locking shaft 21. By the larger lever arm of the trigger lever 27 with actuating lug 28 is the small torque acting in the open position of the locking shaft 21 moment counteracted and the locking shaft 21 with lever 24 via the Deadlock moves towards the closed position, so that the restoring force of the Gas spring 25 via lever 24 a in the locked position causes reverse torque on the locking shaft 21. About the Verriegelungsknaggen 23, the furnace door 13 is securely locked.

In a second embodiment, a fire door closing device according to the invention with advantageous one-hand operation below described.

In Fig. 6 is a front part of a stove 3 with an underlying Locking mechanism shown. With the first embodiment functionally identical components are designated by the same reference numerals.

In Fig. 6 is left to the firebox door opening 12 which is about its axis rotatably mounted hinge shaft 14 is shown. Right of the firebox door opening 12 is the rotatably mounted about its axis locking shaft 21. The hinge shaft 14 is via gas spring 16 and Adjusting lever 15 in the direction of the closed position of not shown in Fig. 6 Firebox door torque applied. Likewise is on the locking shaft 21 via lever 24, the gas spring 25 hinged to a apply defined torque to the locking shaft 21.

Further, between the hinge shaft 14 and the lock shaft 21 a connecting rod 31 by means of adjusting levers attached to the shafts 32, 33 hinged so that a torque transmission from the Hinge shaft 14 on the locking shaft 21 is made possible.

In Fig. 7 is seen in a partial top view of the front area of the stove 3, the movement of the connecting rod 31 in different Positions shown.

In Fig. 8, the respective associated position of the gas springs 16, 25 in a likewise viewed from above detail view of the front portion of the Stove 3 with the associated shafts 14, 21 shown.

In Fig. 7 a, the furnace door 13 is shown in the closed state. As seen from the detailed view, the locking shaft 21 is located in Locking position. The fixed on the locking shaft 21 seated Locking elements 23 (see also Fig. 6) engage behind a suitably designed, not shown counter-element 351 of the furnace door thirteenth The locking elements 23 press due to the torque load the locking shaft 21, the furnace door 13 in the door seal 131st

Furthermore, it can be seen in the detail view that the connecting rod 31st is formed telescopically. It is about the length of one in a slot 311 of hinged to the locking shaft 21 via lever 33 first part 313 of the connecting rod 31 guided driving pin a telescopically guided in the first part 313 second, on the hinge shaft 14th via lever 32 hinged part 314 of the connecting rod 31 telescopic. The connecting rod 31 is in Fig. 7 a in a retracted position shown. The associated positions of the two gas springs 16, 25th is shown in Fig. 8 a.

When opening the firebox door 13 will be over with the firebox door co-rotating hinge shaft 14 of the adjusting lever 32 by about 90 ° in the in Fig. 7 b shown pivoted position. In this case, the connecting rod 31 acts as Push rod on the lever 33 on the locking shaft 21. Accordingly rotate the locking shaft 21 and thus the locking elements 23 about 90 ° in its open position about the death of the on the Locking shaft 21 via lever 24 acting gas spring 25 (s. Fig. 8 b).

According to Fig. 8b acts in the open position of the firebox door 13 in the direction the closed position of the firebox door 13 acting torque on the Hinge shaft 14 via lever 15 and gas spring 16.

Now, if the operator releases the open furnace door 13 or closes manually, this restoring torque acts on hinge shaft 14 and closes the firebox door 13 according to Fig. 7 c. It will Initially, only the hinged side associated second part 314 of Mitnehmerstange 31 according to the driver shown in Fig. 7 c 312 extended in slot 311. Where directly to in Fig. 7 c shown movement, the connecting rod 31 now as a pull rod acts, a right-turn in the drawing plane torque on the locking shaft 21 via lever 33 transmits and thus the gas spring 25th and the lever 24 system over the dead center (see Fig. 8 c) moves.

As soon as the firebox door 13 abuts against the stop according to FIG. 7 d, begins the locking shaft 21 due to the after exceeding the dead center in drawing plane on the locking shaft 21 clockwise acting torque (see Fig. 8 d) in its locking position to rotate, with the connecting rod 31 again in the contracted State (Fig. 7 a) moves and the firebox door 13 sealing is closed.

In FIG. 9, the firebox door 13 belonging to the second embodiment is in FIG Side view shown on the closure side. The door has an operating lever 34, which is pivotally mounted about a rotation axis 341. A lever 342 projecting on the inside above the axis of rotation 341 also cooperates a sliding lock or locking angle profile 35 together, so that this is formed movable up and down. The forms in Fig. 9 for Viewing viewer leg of the locking angle profile 35, the counter-element 351 for the locking elements 23 of the locking shaft 21st

To the operating lever 34 and the locking angle profile 35 in the in Fig. 9 illustrated basic position is also a spring plate 36 am arranged lower end of the locking angle profile 35, which is the locking angle profile 35 loaded upward.

To unlock the firebox door 13 is in the counter element 351 near the Positions of the associated locking elements 23 each have a recess 352 provided. Upon actuation of the lever 34 and the like Displacement of the locking angle profile 35 reach the on the inside of the angle plate on the counter element 351 adjacent locking elements 23 with the recesses 352 in alignment, bringing a release of the Firebox door 13 takes place. When closing the firebox door is the locking angle profile 35 again in his illustrated in Fig. 9 basic position, so that the vorschwenkenden by means of locking shaft 21 Locking elements 23 again to counter element 351 to the system and corresponding lock the firebox door 13 reach.

Claims (14)

1. A closure device for a combustion-chamber door, in particular for stoves, with a combustion-chamber housing (1) and a swivellably mounted combustion-chamber door (13) held therein which is actuated by a restoring torque for automatic closure, characterised in that a locking shaft (21) with means (18, 23) for locking the closed door is provided, which shaft is actuable by rotation between a locking position and an open position, whereby in the locking position the said shaft locks the closed combustion-chamber door (13) with the combustion-chamber housing (1), in the open position the combustion-chamber door (13) is openable, and a means (27, 28, 31) is provided for unlocking the door during the automatic restoring-torque actuated closure of the combustion-chamber door (13).
2. A closure device for a combustion-chamber door according to Claim 1, characterised in that the locking shaft (21) is designed so as to be actuated by a torque for automatic return into the locking position, whereas, however, no restoring moment acts in the open position.
3. A closure device for a combustion-chamber door according to Claim 2, characterised in that an adjusting lever (24) is connected non-positively with the locking shaft (21), a restoring force, which generates the torque, contacting the said adjusting lever (24) in such a way that the resultant torque acting on the locking shaft (21) increases substantially in the direction of the locking position, is zero in the vicinity of the open position (dead point), and in the open position acts in this direction for fixing this position.
4. A closure device for a combustion-chamber door according to Claim 2 or 3, characterised in that a gas-pressure spring (25), preferably with damping, is provided for generating the restoring torque on the locking shaft (21).
5. A closure device for a combustion-chamber door according to Claim 2, 3 or 4, characterised in that the means for unlocking the door is a disengaging lever (27) positioned on the locking shaft, which lever is actuated by the closing door (13) and transfers a torque to the locking shaft (21) to overcome the dead point in the vicinity of the open position.
6. A closure device for a combustion-chamber door according to Claim 5, characterised in that the disengaging lever (27) is coupled to the locking shaft (21) in such a way that the locking shaft (21) remains only in the locking position when the combustion-chamber door (13) is simultaneously opened with rotational actuation of the locking shaft (21).
7. A closure device for a combustion-chamber door according to Claim 2 or 3, characterised in that a hand lever (22) is provided for rotational actuation of the locking shaft (21).
8. A closure device for a combustion-chamber door according to one of the preceding Claims 2 to 7, characterised in that the locking shaft (21) is arranged on the combustion-chamber housing (1), preferably on the opposite side of the opening (12) to the swivel axis of the combustion-chamber door (13), the said opening (12) being clamped by the combustion-chamber door.
9. A closure device for a combustion-chamber door according to one of the preceding Claims 2 to 8, characterised in that a gas-pressure spring (16) coupled, via an adjusting lever (15) to a hinge shaft (14) non-positively connected to the combustion-chamber door (13) is provided for the purpose of generating the restoring torque on the combustion-chamber door (13).
10. A closure device for a combustion-chamber door according to Claim 9 or 10, characterised in that the adjusting lever (15) and the gas-pressure spring (16) generating the torque are arranged in such a way that that the resultant torque on the hinge shaft (14) increases in the direction of the closure position of the door (13).
11. A closure device for a combustion-chamber door according to one of the preceding Claims 3 to 10, characterised in that the means for locking the closed door on the locking shaft (21) are non-positively arranged locking catches (23) and associated stirrup-like members (18) on the combustion-chamber door (13), the locking catches (23) engaging behind the stirrup-like members (18) in the locking position.
12. A closure device for a combustion-chamber door according to Claim 2, 3 or 4 and according to Claim 9, characterised in that the means for triggering the locking of the door is a connecting bar (31) which is arranged between hinge shaft (14) and locking shaft (21) and is coupled by means of adjusting levers (32, 33), a torque being transferred to the locking shaft (21) - via the connecting bar (31) - by the door (13) closing due to actuation by the restoring force, for the purpose of overcoming the dead point in the vicinity of the open position.
13. A closure device for a combustion-chamber door according to Claim 11, characterised in that an actuating lever (34) is positioned in the combustion-chamber door (13), which has means for unlocking the combustion-chamber door (13), and in that, when the combustion-chamber door (13) is opened, the locking shaft (21) is brought into the open position by the connecting bar (31) coupled to the locking shaft (21) and the hinge shaft (14).
14. A closure device for a combustion-chamber door according to Claim 12 or 13, characterised in that the connecting rod (31) is of a telescopic design with longitudinal, preferably adjustable play (311, 312).

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