Sealing device between movable parts in mutual contact

Movable or removable closures – Closure seal; e.g. – striker gasket or weatherstrip – Bulged sealing surface intermediate securing ends

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Details

494931, E06B 722

Patent

active

059503670

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a device for sealing between two assembly parts that are movable relative to one another,
2. Description of the Prior Art
From DE 38 15 402 A1, a device for sealing the contact zone between a movable shut-off element of a pipeline and a stationary seat is known. That device uses an elastic seal in the form of an elongated spring-steel strip in the sealing area. Outside of the arched sealing zone, in the longitudinal direction of the sealing element, the spring-steel strip has two bends. The two longitudinal edge areas of the spring-steel strip point to the same side and are placed one atop the other, as clamping edges, and can be attached on one side to the movable shut-off element or to the stationary seal seat by means of a clamping device (e.g., a screw connection). This seal has proved to be very effective, particularly when the relative movement which occurs between the spring-steel strip and the matching seal seat during the closing process is roughly perpendicular to the arched sealing zone. In cases when the relative movement during closing is more tangential relative to the arched sealing zone, situations of extreme stress for the spring-steel seal sometimes develop, which can result in the spring-steel strip being lifted up from the supporting surface and, in consequence, in breakage of the spring-steel strip.
In order to avoid negative consequences of this type, it is known from WO 95/02136 to provide a supporting profile in the interior of the sealing element. This supporting profile, which serves as a hold-down device, rests on the supporting surface of the spring-steel strip near the bend farthest from the clamping point and prevents the strip from lifting up. The hold-down device can be designed, for example, as a roughly V-shaped profile, and it is secured between the clamping edges of the spring-steel strip by means of the clamping device. Because extraordinarily corrosive conditions frequently occur in flue gas fittings, the hold-down device, like the spring-steel strip, must be made of high-alloy material, making it quite expensive. It is also disadvantageous that when a large-area flue gas damper equipped with one of the known sealing elements is opened, the break-away torque resulting from the hold-down device can be undesirably high.


SUMMARY OF THE INVENTION

The object of the present invention is to provide a sealing device in which it is possible, upon reaching the closed position, to reliably avoid the impermissible lifting and deformation of the spring-steel strip by tangential side-forces, at the lowest possible material and assembly expense, without impermissibly detracting from the required elastic deformability of the sealing element; rather, the seal is to be more flexible, i.e., softer, in nature, in order to achieve a reduction in the break-away torque.
Pursuant to this object, and others which will become apparent hereafter, one aspect of the present invention resides in a device for sealing between two assembly parts movable relative to one another, especially between two damper blades or a damper blade and a stop of a flu gas armature. The device includes an elastic sealing element formed by a spring-steel strip containing two flat clamping edge regions arranged parallel and next to one another and configured to extend in a common direction, and a curved, arc-shaped sealing zone between the clamping edge regions so that the sealing element encloses a space. A support element is arranged inside the space enclosed by the sealing element and has a flat support surface. The sealing element is configured to have at least one bend between the sealing zone and at least one of the clamping edge regions so as to form a resting surface located outside of the clamping edge regions. The resting surface lies on the flat support surface of the support element. A clamping device is provided for clamping the clamping edge regions and the support element to one of the assembly parts so that the other assemb

REFERENCES:
patent: 3241198 (1966-03-01), Baermann
patent: 3411246 (1968-11-01), Miller
patent: 4447989 (1984-05-01), Maplano et al.
patent: 4660805 (1987-04-01), Hahn et al.

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