GB2164734A

GB2164734A - Kiln car superstructure

Info

Publication number: GB2164734A
Application number: GB08523041A
Authority: GB
Inventors: Karl Dieter Kehl; Hubertus Peter
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-09-18
Filing date: 1985-09-18
Publication date: 1986-03-26
Also published as: DE3434181C2; GB2164734B; DE3434181A1; GB8523041D0

Abstract

A hollow upright with transverse openings for use on kiln car superstructures, has bends 4b,4c shaped from the wall sections in the area of the transverse openings to provide enlarged supporting areas and guideways for cross bar insertion. The upright may alternatively have horizontal tubular supporting areas, and is of recrystallised silicon carbide. <IMAGE>

Description

SPECIFICATION Hollow upright for kiln car superstructures The invention relates to a hollow upright with transverse openings forming supporting areas for insertion of cross bars, made of recrystallized silicon carbide, for use on kiln car superstructures, as have become known by German Utility Model Specification 82 29 303. According to this specification, the width of the areas which are to support the inserted cross bars is merely equal to the wall thickness of the hollow upright. Consequently, the substance supporting the cross bars which are to hold the ware pieces in addition to the ware carrier trays is comparatively small in area and, where high baking temperatures are used, these small areas on the opposed wall sections may easily leave incisions or other undesirable marks on the cross bar insertions.

Solid type uprights of refractory material have long been known (GB-PS 121,251), with cross bar supporting across naturally extending over the entire cross section of the upright. However, for some time the general trend in the field of kiln car superstructures is to provide uprights with slightly hollowed sections. This has become feasible by the methods available to produce such parts of recrystallized silicon carbide. Therefore, the object of the invention is to provide optionally sized supporting areas also on the transverse openings of hollow uprights of recrystallized silicon carbide, so as to reduce the surface pressure between the inserted tray-carrying cross bars and the supporting areas.

According to the invention, this object is achieved by providing bends which are shaped on the supporting wall section areas of the hollow uprights and which extend in the direction of the transverse openings. These bends form tub- or trough-like supporting areas which match the shape of the cross bar sections and which may extend towards the outside of the cross section of the hollow upright, but also towards the inside.

When, according to another inventive proposal, the bends on opposite wall sections of the hollow upright are shaped to extend inwardly, combining to form a through supporting area, the cross bar is merely required to locate the entry side of the opening in the hollow upright, since the inside of the hollow upright will form a through guideway for insertion of the cross beam.

When the transverse openings have surrounding angular through bends on all sides, in which case the lower tub- or trough-shaped bend constitutes the supporting area, the invention further provides that the angular side bends running lengthwise on the hollow upright will be spaced away from adjacent wall sections of the upright. This ensures communication between the cavities above and below the angular through bends to, thus, counter heat accumulation inside the upright.

A further advantage of this solution is the stiffening effect imparted to the hollow upright by the bends which form an enclosed cross channel.

A number of inventive examples of a hollow upright are shown in the drawing, wherein: Figure 1 is part of a hollow upright of prior art, with a square cross section and square transverse openings in opposite wall sections of the upright.

Figure 2 is part of a hollow upright according to the invention, with a circular cross section and a round transverse opening.

Figure 3 is a vertical section through line 111- 111 in Fig. 2, showing bends extending outwards in the left half and inwards in the right half of the upright.

Figure 4 is part of a hollow upright according to the invention, with a view of the upper portion and a vertical section of the lower portion.

Figure 5 is a vertical section through line V V in Fig. 4.

A prior art hollow upright 1 in Fig. 1 of recrystallized silicon carbide is provided with a transverse opening 2 in each of its opposed wall sections for insertion of square cross bars (not shown), in which case the transverse dimension of supporting areas 3 that are to accommodate the cross bars can at most be equal to the wall thickness of the hollow upright 1.

A hollow upright 4 in Fig. 2 and 3 is circular in its cross sectional area and is provided with circular transverse openins 5 in its opposed wall sections 4a, having bends 4b (left half) and 4c (right half) shaped thereon in the area of the openings 5, said bends extending in the direction of the transverse openings 5 to form semicircular supporting areas 6 and 7.

The enlarged supporting area 6 extending outwardly facilitates the cross bar threading procedure through transverse opening 5. The enlarged supporting area 7 extending inwardly may also facilitate threading of a cross bar and is in a protected position within the cross section of the upright. By joining the bends 4c together on either side, the inwardly extending supporting area 7 will form a through guideway.

The hollow upright 10 shown in Fig. 4 and 5 has a square cross sectional area and square transverse openings 11, each of said openings being surrounded with inwardly extending uniformly combined angular bends 10b, 10c, 10d and 10e of the opposite wall section 10a. In this manner the transverse openings 11 have been provided with through transverse channels similar to the known solid type uprights, with optimally long supporting areas 12 serving as guides for insertion of cross bars. Moreover, the angular bends will increase the section modulus of the hollow upright in the very area of the transverse openings. As may be taken from Fig. 4, the angular side bends 10c and 10e are spaced away at A from their adjacent wall section on the hollow upright 10 to permit the cavities above and below each transverse opening 11 to communicate.

The solution embodied in Fig. 4 and 5 may also be realized on hollow uprights having round sectional areas and round transverse openings.

Claims

1. A hollow upright with transverse openings forming supporting areas for insertion of cross bars, made of recrystallized silicon carbide, for use on kiln car superstructures, characterized in that bends (4b, 4c and 10b, 10c, 10d, 10e) are shaped on the wall sections (4a, 10a) of the hollow upright (1, 10), which form supporting areas, said bends extending in the direction of the transverse opening (5, 11).

2. A hollow upright according to Claim 1, characterized in that the bends (10b) on the opposed wall sections (10a) of the hollow upright (10) are shaped to extend inwardly and, thus, combine to form through supporting areas (12).

3. A hollow upright according to Claim 2, characterized in that angular bends (10b, 10c, 10d, 10e) surround the transverse openings (11) on ail sides, in which case the angular side bends (10c, 10d) running lengthwise on the hollow upright (10) are spaced away (A) from their adjacent wall sections on the hollow upright.

4. A hollow upright substantially as herein described with reference to the accompanying drawings.