GB1600621A - Retaining means - Google Patents

Description

(54) RETAINING MEANS (71) We, PARK ROYAL PORCELAIN COMPANY LIMITED, of Woodlands, Cox Hill, Sandy, Bedfordshire, a British Company, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The invention relates to retention of oven or kiln linings of ceramic fibre blanket or other incombustible material.

The invention provides an improvement on known lining anchors of the kind constituted by a flanged thimble or cup which is passed, by means of a slot in its head, over a keyed stud fixed to the kiln or oven wall and turned to engage the stud. The known thimbles engage the studs only at the head, that is to say the top of the thimble, giving rather poor location.

We now propose a construction in which an intermediate locating piece, fixed against a shoulder withln the bore of the thimble, is used to increase the support. Such a locating piece has an aperture corresponding to that in the head of the thimble and is located in a recess shaped so that the correct orientation of the aperture in the locating piece and the slot in the head of the thimble is ensured.

Preferably the locating piece is made of a stronger material than the rest of the thimble and may be either metal or ceramic. The known thimbles, in ceramic, are passed over the stud until they engage the lining, then a key position on the stud is felt for and the thimble turned to engage the stud. A hamhanded operator can turn the thimble without finding such a position and simply crush out the slot in the thimble, which is then useless. With a strong locating piece this cannot easily be done.

The invention extends also to ovens of kilns lined using the anchors of the invention.

The invention is illustrated in Fig. 1 of the accompanying drawings, in which an oven casing 1 carries a flat, keyed, mild steel stud 2, one of a number fixed at intervals over the casing. An anchor thimble 3 retains a ceramic fibre blanket 4 roughly laid over the studs with holes made in it at the stud positions. The anchor thimble, which is in conventional ceramic, has a load-spreading flange 5 and a slot 6 in its head, shaped to pass over and then turn and key with the stud. An intermediate locating piece or disc is provided half way up the anchor and retained in place against a shoulder 8. As seen in the plan view, the shoulder 8 is the bottom of a recess 9 pressed in the body of the anchor, this recess continuing as a cylin- drical bore 10 as far as the head of the thimble, in which the slot 6 is formed.The bottom of the recess is shaped as a rectangle, i.e. not radially symmetrical, and the location piece is correspondingly shaped so that the proper orientation of the slot 11 in it is ensured. The location piece as shown is positioned so as to enter the third key along from that entered by the head of the thimble, but it may for example enter the second key along or even the adjacent one with satisfactory results.

A subsidiary aspect of the invention is now described, which may be used in conjunction with the above.

In this present aspect the anchor is combined with a support for carrying electrical heating elements or anything else required to be installed above the surface of the lining.

The invention in this aspect extends to installations of heating coils or other equipment using the support anchors as well as to the supports themselves, combined with the anchor.

Various forms of this aspect of the invention are shown in Figs. 2 to 5 of the accompanying drawings in which: Fig. 2 is a part-sectional elevation of an anchor provided with a heating element support according to the invention; Figs. 3 to 5 show alternative forms of support, Fig. 3 being for a screw in support (some known types of anchor have their end closed by a screw plug rather than by the alternative means of filling with a mouldable i.e. plastic, ceramic mix) and Fig. 5 showing a support for a ribbon element rather than for the coiled element of Figs. 3 and 4; In all embodiments the material from which the exposed parts of the anchor are made depends on the service temperatures.

It may be ceramic or, where moderate service temperatures of up to 1000"C are expected, high grade steel or other metal if desired.

The anchor of Fig. 2 is not specifically described as regards aspects similar to those of the anchor of Fig. 1. The thimble 3 is however plugged by an element support 12 secured by cement and bored both internally for the outer end of the stud and externally at 13, to save material and reduce thermal stresses. A flange on the element support, not separately referenced, retains the element and the general disposition of the elements is shown in the small sketches of a typical installation included in the figure. Any desired configuration of heating coil may be installed once the insulation is in place.

Figs. 3 to 5 speak for themselves, so far as not already described above.

In all the thimbles shown in Figs. 1 to 5 and in the plug (support) shown in Fig. 2 the inner corners 18 and 18' are chamfered to relieve the thermal stresses and strengthen the flanges against thermal shock.

WHAT WE CLAIM IS: 1. A ceramic or refractory metal thimble, for retention of a ceramic fibre blanket or other incombustible kiln or oven lining, having a flanged head to bear against the lining and a bore which ends in a first slot allowing the thimble to be passed over a notched stud fixed to the kiln or oven wall and to be turned to engage it, wherein the bore has an internal shoulder part way along its length shaped to receive a separate slotted location piece with its slot oriented correspondingly to the first slot for passage over the stud and subsequent engagement with it.

2. A thimble according to claim 1, combined with a support for electrical heating elements of other installations above the surface of the lining within the oven or kiln.

3. A thimble according to claim 2, wherein the support constitutes a plug for the bore of the thimble.

4. A thimble according to claim 1. 2 or 3, wherein the location piece is of stronger material than the main body of the thimble.

5. A thimble according to claim 1 for retention of oven or kiln linings, substantially as herein described in relation to and shown in any one of Figs. 1 to 5 of the accompanying drawings.

6. An oven or kiln lining installation using the thimbles of claim 1, 2, 3, or 5.

7. An oven or kiln lining installation using the thimbles of claim 4.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. In all embodiments the material from which the exposed parts of the anchor are made depends on the service temperatures. It may be ceramic or, where moderate service temperatures of up to 1000"C are expected, high grade steel or other metal if desired. The anchor of Fig. 2 is not specifically described as regards aspects similar to those of the anchor of Fig. 1. The thimble 3 is however plugged by an element support 12 secured by cement and bored both internally for the outer end of the stud and externally at 13, to save material and reduce thermal stresses. A flange on the element support, not separately referenced, retains the element and the general disposition of the elements is shown in the small sketches of a typical installation included in the figure. Any desired configuration of heating coil may be installed once the insulation is in place. Figs. 3 to 5 speak for themselves, so far as not already described above. In all the thimbles shown in Figs. 1 to 5 and in the plug (support) shown in Fig. 2 the inner corners 18 and 18' are chamfered to relieve the thermal stresses and strengthen the flanges against thermal shock. WHAT WE CLAIM IS:

1. A ceramic or refractory metal thimble, for retention of a ceramic fibre blanket or other incombustible kiln or oven lining, having a flanged head to bear against the lining and a bore which ends in a first slot allowing the thimble to be passed over a notched stud fixed to the kiln or oven wall and to be turned to engage it, wherein the bore has an internal shoulder part way along its length shaped to receive a separate slotted location piece with its slot oriented correspondingly to the first slot for passage over the stud and subsequent engagement with it.

2. A thimble according to claim 1, combined with a support for electrical heating elements of other installations above the surface of the lining within the oven or kiln.

3. A thimble according to claim 2, wherein the support constitutes a plug for the bore of the thimble.

4. A thimble according to claim 1. 2 or 3, wherein the location piece is of stronger material than the main body of the thimble.

5. A thimble according to claim 1 for retention of oven or kiln linings, substantially as herein described in relation to and shown in any one of Figs. 1 to 5 of the accompanying drawings.

6. An oven or kiln lining installation using the thimbles of claim 1, 2, 3, or 5.

7. An oven or kiln lining installation using the thimbles of claim 4.