Receptacles – Closures – Closure guided in reciprocating movement
Patent
1987-03-19
1988-06-21
Hall, George T.
Receptacles
Closures
Closure guided in reciprocating movement
222512, B65D 4320
Patent
active
047520175
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a tensioning device for a sliding gate provided on the nozzle of a vessel containing molten metal, the sliding gate including a housing, a bottom plate permanently installed therein, a sliding plate adjustably mounted in a housing cover and sealingly and resiliently pressed against the bottom plate by means of clamping units hinged to the housing and crossing under the housing cover.
In a sliding gate of the prior art disclosed in Swiss Patent CH-PS No. 639 301 and of the type described above, the tensioning of the sliding plate against the bottom plate occurs via adjusting screw means which are distributed over the circumferential sides and act on the housing and on the cover and, upon being tightened, produce a surface pressure on the sliding plate. The adjusting screw means each have a screw bolt pivotally suspended on a hinging shaft acting as a clamping unit, a threadless sleeve crossed under the housing cover, a lock nut and cup springs inserted between sleeve and nut. In order to be able to produce the required adjustable surface pressure, these cup springs require a rather elaborate and exact fabrication. In addition, it has been shown in practice that cup springs are sensitive and frequently cause defects. Admittedly, a collar provided on the sleeve must protect the springs against external effects, such as heat and dust accumulation, but this will prevent visual inspection of the condition of the springs.
SUMMARY OF THE INVENTION
The invention is directed toward the improvement of the spring action on the clamping units hinged to the housing.
According to the invention, this object is achieved by designing the hinging shafts of the clamping units as bending or flexure springs. This bending spring, for example, in the form of a simple, oblong leaf spring, a torsion rod spring, or a leaf consisting of laminated spring leaves can be adjusted with a high degree of accuracy to the required tensioning force between gate housing and housing cover. Such springs can easily be mounted or dismounted and at the same time satisfy two functions: on the one hand, the cushioning of the housing cover on the housing and, on the other hand, the hinging of the clamping units. In addition, the bending springs can be inspected without difficulty due to their uncluttered arrangement.
Preferably, the bending springs are mounted at both ends thereof in the gate housing and support at least one clamping means formed as an eyebolt with lock nut and are locked against lateral movement. Laminated leaf springs have proven suitable for use as a bending spring and are appropriately locked at one end by a transverse bolt and held in a bushing, while the other end has a free seating in the longitudinal direction in order not to be subjected to additional tensile stresses. Here, the bushing can be locked on the housing by means of an adjusting bolt in two opposing directions of deflection of a bending spring, which, when required, can be turned around from a used to the still unused deflection side. Each bending spring is locked against excessive deflection by a stop means provided on the gate housing. The same kind of stop means prevent the eyebolts supported by the bending springs from moving sideways.
For linear sliding gates it is particularly useful to provide two coaxial bending springs, each with a clamping unit, on each of the opposite long sides of the housing.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to the accompanying drawings; wherein
FIG. 1 is a side view partially in section, of a sliding gate fitted out according to the invention,
FIG. 2 is a transverse section through the sliding gate in FIG. 1, a tensioning device being shown in elevation, and
FIG. 3 is a partial cross-sectional view of the sliding gate in FIG. 1 taken along the line III--III.
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1 and 2 show a conventional sliding gate 20 not described in great detail hereinafter, secured to a partially illustrated v
REFERENCES:
patent: 3765579 (1973-10-01), Cramer
patent: 4538729 (1985-09-01), Ackeret
Rietmann Karl B.
Troxler Beat
Hall George T.
Stopinc Aktiengesellschaft
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