Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1995-05-04
1996-12-24
Cummings, Scott
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 74, 33705, F16J 1546
Patent
active
055867715
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an arrangement for providing sealing of an element movable in an oblong or elongate slit.
2. The Prior Art
Previously known seals for elongate slits include rubber tubes shaped for this purpose. Such slits can be inaccurate, i.e., out of tolerance, and their form or shape can change or vary over the length thereof. One or several tubular seals have been installed in a slit or arranged in pairs on both sides of the slit. When tubular seals are made airtight and provided with the possibility to supply air pressure or retain pressure in the tube, a seal is produced that yields and allows significant play between the parts that have to be sealed. At a proper moment, air under pressure is fed to the seal, for instance when a door, which must be shut, has been closed, such that the pressure in the tubular seal does not hinder the closing of the door.
SUMMARY OF THE INVENTION
In the solution this invention tubular seals are, in a new way, adapted to the sealing function of the element that is moved in or moves in respect to the slit as well as to the sealing function of the slit, whereby the special requirements of the moving element have been taken into account, in order to maintain tightness and reduce friction and wear.
The most important advantages of the invention include the features that the movable element in the slit can be made reliably sealed, partly due to reduced friction, such that the tubular sealings do not wrinkle or otherwise deform due to the sliding forces between themselves and the moving element, and that the reliability is further increased by the notable decrease of wear of the sealing tubes thanks to lubrication by the air that is supplied. This air or other pressurized flow to the sealing face also keeps the sealing face free from dirt. Pressure fed to the sealing face with possible lubrication medium contained therein, ensures the start of the element without damaging the seal even in a case where there has been quite a long break of operation in between. The pressure is then allowed to affect the sealing face before the element is set into motion.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following the invention is presented in detail with reference to the enclosed drawing, where
FIG. 1 is an element in a slit that has to be sealed, viewed from the end;
FIG. 2 is a perspective view of an element moving in a slit;
FIG. 3 is a perspective view of an alternative embodiment of the element shown in FIGS. 1 and 2.
DESCRIPTION OF A PREFERRED EMBODIMENT;
FIG. 1 shows the end view of a slit that must be sealed and is formed in a tubular profile beam 3. In the beam a mechanism, only a part of which is shown in the figure, is arranged to move element 1 in the tubular beam direction, i.e., parallel to the longitudinal axis of beam 3. In both edges of the slit, tubular rubber sealings or sealing tube 4 are glued, the profile of 4 which comprises a planelike or planar section for gumming or otherwise affixing to beam 3 and the actual tubular part. The slit is sealed by tubular rubber sealings when air for pressurizing the tubes 4 is fed into tubes 4. The tube sides touch each other and close the slit.
The sectional view in FIG. 1 shows the location of element 1. The element 1 is supported on the beam edges by rollers 2 travelling along the edges. At the sealing tubes 4 the element, has a portion or part 6 tapering off towards its ends and a measuring sensor 5. Thus, the measuring sensor 5 can, as a movable part, be taken to a space or area of different climate or conditions by means of the said slit sealing. Measuring device 5, or any other instrument used in place thereof is placed in hard and difficult conditions, for instance for crosswise measuring of web in a paper machine. By means of slight over-pressure, a normal condition or climate can be produced inside the profile beam 3 thanks to the sealing function.
FIG. 2 shows a perspective view of element 1. Part 6, which tapers off towards its ends, is in slid
REFERENCES:
patent: 2859987 (1958-11-01), Emley, Jr.
patent: 3815926 (1974-06-01), Vore
patent: 4230324 (1980-10-01), Derman
patent: 4376543 (1983-03-01), Sakagami
patent: 4377036 (1983-03-01), Dangschat
patent: 4462619 (1984-07-01), Hotger
patent: 4600203 (1986-07-01), Miller et al.
patent: 4632722 (1986-12-01), Pankoke
patent: 5076108 (1991-12-01), Trimarchi
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