Work holders – Relatively movable jaws – With means for 'hold-down' component of force
Patent
1988-03-03
1989-09-19
Schmidt, Frederick R.
Work holders
Relatively movable jaws
With means for 'hold-down' component of force
269138, 269234, 222591, B23Q 302
Patent
active
048674281
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for clamping a refractory fireproof plate into a metal frame of a slide gate or sliding closure unit for controlling the discharge of molten metal from a metallurgical vessel. More particularly, the invention relates to such a device including a wedge-shaped member that has a drive surface that exerts a wedging effect in a direction transverse to the circumference of the plate by displacement of a bolt positioned in the frame.
Clamping devices with wedge-shaped members are known from DE-OS NO. 35 22 134, wherein such members engage between the periphery of the fireproof plate and a peripheral area of the metallic frame when bolts that are inserted through holes in the wedge-shaped member and screwed into tapholes in the frame are tightened. The disadvantage to this arrangement is that in loosening the bolts, in order to change plates for example, the wedge-shaped members often stick to the plates as a result of thermal distortion and fouling and can be dislodged only with great difficulty, which hinders efficient replacement of the plates.
SUMMARY OF THE INVENTION
The object of the present invention is to improve the performance of such a clamping device, especially when loosening the grip thereof to replace a plate.
According to the invention, this object is achieved in that the wedge-shaped member is movable along the thread of a turnable bolt rotatably mounted in the frame upon rotation of the bolt, and that the drive surface of the wedge-shaped member acts on a pressure surface of a clamp jaw that slides in the frame and that is engaged with the wedge-shaped member via tracks that are inclined parallel to the drive surface. This means not only that when the bolt is tightened the clamp jaw transmits a uniformly clamped surface pressure to the plate perimeter area, which is at any rate perpendicular to the plate surface, but that when the bolt is untightened, the loosening of the wedge-shaped member results in positive retraction of the clamp jaw from the plate perimeter. Because of this, the fireproof plate is automatically exposed in the frame for an unimpeded, rapid plate replacement operation.
In terms of design of the device, it is appropriate that the clamp jaw slides in a bed of the frame and spans the wedge-shaped member that is movable along the bolt, and that the member has a U-shape with side walls extending in the slide direction and having contact surfaces in which are formed the tracks. Advantageously the tracks are configured as slots formed in the side walls and joining the pressure surface of the clamping jaw. The slots receive correspondingly shaped keys of the wedge-shaped member. This construction is simple and effective.
In terms of the configuration, positioning and manipulation of the bolt supporting the wedge-shaped member, the invention provides that the bolt be positioned perpendicular or nearly perpendicular to the planar surface of the plate, with a collar at one end of the bolt positioned in a stepped recess of the frame, and with the bolt having a socket wrench profile at an opposite end. This results in a compact design of the device, which is braced against and fully integrated in the frame.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in more detail below with reference to the drawings, wherein:
FIG. 1 is a longitudinal section of a linearly movable sliding closure unit equipped with clamping devices according to the invention;
FIG. 2 is a partial plan view of the movable plate and the frame thereof of the unit of FIG. 1, shown with a clamping device of the invention;
FIG. 3 is a section along line III--III in FIG. 2, on an enlarged scale;
FIG. 4 is a plan view of an element shown in FIG. 3;
FIG. 5 is a cross-section through the element of FIG. 4;
FIG. 6 is a plan view of another element shown in FIG. 3; and
FIG. 7 is a side view of the element of FIG. 6.
DETAILED DESCRIPTION OF THE INVENTION
A slide gate or sliding closure unit 1 shown in FIG. 1 is not described in detail and
REFERENCES:
patent: 2600183 (1952-06-01), Arnold
patent: 2637249, Swenson
patent: 2667799 (1954-02-01), Rzepela
Holmes David A.
Schmidt Frederick R.
Stopinc Aktiengesellschaft
LandOfFree
Device for clamping fireproof plates in metal frames of slide-va does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for clamping fireproof plates in metal frames of slide-va, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for clamping fireproof plates in metal frames of slide-va will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-363347