AN AMPOULE CONTAINING A WOOD PRESERVATIVE COMPOSITION FIXED TO A CLOSURE CAP FOR CLOSING A RECESS IN WOOD FOR RECEIVING SAID AMPOULE AND A SUITABLE CLOSURE CAP OF THIS TYPE

Abstract: An ampoule 1 of breakable material, such as glass, being fixed with its upper part in bore 6 of a plastic closure cap 3 for sealingly closing a recess 9 in wood, said recess receiving said ampoule and the contents of same after opening of the ampoule 1. The upper part of the ampoule is preferably fixed to the cap 3 by means of an adhesive, said adhesive may be present between the part of the ampoule outside, said bore and lips 10 projecting below said cap 3. The bore 6 in the cap 3 may be cylindrical or tapers into the direction of the part of the ampoule located outside said bore 6. The inner side of the bore 6a may also be provided with ampoule retaining ribs 18. Preferably the lower part 4 of the outer side of the cap 3 tapers and is provided with annular ribs 17 and annular recesses 16 acting as clamping and sealing promoting means for sealingly and clampingly engaging the wall of a recess 9 in wood. The closure cap 3 may also be connected by strips 13 with a bottom support 14, the ampoule being retained between the bore 6 in cap 3 and the bottom 7 of a recess 15 in bottom support 14. A sensor 10′ for measuring conditions in recess 9 may be accommodated in closure cap 3.

Description: An ampoule containing a wood-preservative composition fixed to a closure cap for closing a recess in wood for receiving said ampoule and a suitable closure cap of this type. The invention relates to an ampoule containig a wood-presersative composition. An ampoule of this kind consisting of glass, for example, and containing a woodpreservative composition, consisting of a waterexpelling organic solvent, a biocide and a water repellent compound, e.g. a paraffin or siloxane compound and the like, is known in the art. These ampoules are used for combating wood attack by fungi, particularly in the region of joints of wooden window and door frames. In order to obtain this action , the ampoule is fitted into a recess drilled inthewood to be treated, whereafter the ampoule is broken so that the wood preservative composition is released in the recess, the top of said recess being closed with a wooden plug or, for example, a plastic cover cap in order to avoid escape of the noxious compounds of the composition. The separate fitting of the ampoule, breaking of same, and consecutively the fitting of a closure cap is a relatively laborious treatment, particularly as an epoxy resin coating has to be applied after the fitting of the loose closure cap in order to obtain a good seal for the recess. Another disadvantage is that the recess might be closed without fitting an ampoule into the recess, so that woodrot is not treated or prevented. Finally, there is a risk that the ampoule may not be opened in the recess, so that the wood preservative composition in the ampoule is not released. The object of the present invention is to provide an ampoule of the above type which, on the one hand, can readily be fitted into and opened in a recess, while the recess containing the ampoule can at the same time be closed, and on the other hand an absolutely reliable accommodation of the ampoule in the recess is guaranteed. To this end, according to the invention, the ampoule is fixed to a closure cap of plastic material for closing a recess in wood for receiving said ampoule. As the user is now able to work with an assembly of closure cap and ampoule, it is impossible to forget to fit an ampoule into the recess when carrying out repair work, while on the other hand the plastic material of a solid closure cap is sufficiently deformable to engage sealingly the inner wall of the recess without the use of separate sealing means. By using this combination of interconnected ampoule and closure cap, one can also be certain that an ampoule fitted into a recess of appropriate predetermined depth will break or open when the closure cap is knocked into the recess opening, and in addition the recess will be excellently sealed. In this respect it should of be noted that the assembly permits the use rather short ampoules as these ampoules are always excellently broken in comparison with the use of a loose closure cap and loose ampoule. According to one very advantageous embodiment, the ampoule is clampingly received in a bore in the closure cap, so that the ampoule and closure cap assembly can readily be manufactured and a good connection between the ampoule and the closure cap is guaranteed even during rough handling. Preferably, the bore in the closure cap is of a cylindrical shape. In a particularly advantageous embodiment the closure cap is connected to a bottom ampoule support, the ampoule co-operating with the closure cap and the ampoule support. According to one very advantageous embodiment, the bore in the closure cap tapers conically into the direction of the inside of the cap so that, on the one hand, it is a simple matter to fit the ampoule into the closure cap bore while, on the other hand, very intimate clamping can be obtained between the entry side of the bore to the closure cap and, on the other hand, the ampoule disposed therein. An ampoule according to the invention, containing a wood-preservative composition, secured in a plastic closure cap, also offers the user an absolutely reliable protection against contact with the woodtpreservative composition in the ampoule. If a loose ampoule and a loose closure cap are used, in fact, there is no guarantee that harmful substances of the composition in the ampoule will not escape and result in undesirable effects on persons using such ampoules during the fitting and breaking of the ampoule in the recess. Advantageously, the closure cap at least partially conically tapers at its outer side in the direction of the ampoule, so that a recess formed in wood to be treated during the fitting of the closure cap to the recess is very appropriately sealed off. In a very advantageous embodiment the closure cap is connected with the ampoule by means of an adhesive, preferably one or more projecting lips connected to the ampoule by means of an adhesive connection. According to one very advantageous embodiment, the closure cap may contain a sensor so that it is possible to measure certain condi tions in the recess formed in the wood and containing the ampoule. These may, for example, be the moisture content, the amount of remaining wood-preservative composition and the like. In this way it is possible, for example, after the ampoule has been fitted, to measure ar regular intervals the extent to which substances of the wood-preservative composition are still present or active. The invention also relates to a closure cap for use with an ampoule of the invention. The invention will now be explained with reference to an embodiment with respect to the accompanying drawings wherein: Fig. 1 is a section through an ampoule and closure cap assembly according to the invention. Fig. 2 is a section of a modified assembly according to Fig. 1. Fig. 3 is a section of a closure cap with part of an ampoule and a sensor contained in the closure cap accommodated in a recess in a wooden part of a window frame. Fig. 4 is an embodiment in which the ampoule closure cap is pro vided with conically extending recesses disposed above each other. Fig. 5 is a section to a received scale of the closure cap shown in fig. 4. The drawings show a glass ampoule 1 containing a wood-preservative composition 2. This composition consists, for example, of 85 tetralin as a water expelling organic solvent, 2% of an organo-tin compound and 13 ó of a paraffin wax as water-repellent agent. The ampoule is fixed in a closure cap 3 of plastics; a very suitable plastic is, for example, nylon or polyethylene, although other plastics are also very suitable for such a closure cap. A nylon closure cap is preferred. In Figure 1 the upper part of the ampoule 1 is accommodated in a cylindrical bore 6 in a nylon closure cap 3, the shape of the bottom of the bore 6 being adapted to the engaging part of the ampoule. The closure cap 3 comprises two opposite lips 10 glued to an adhesive label 11 glued to the surface 12 of the ampoule 1. An assembly of this kindisvery easy to manufacture. Of course the ampoule 1 may also be fixed to the closure cap 3 by an adhesive layer between the bottom of the cylindrical bore and the opposite part of the ampoule. Figure 2 shows an embodiment in which the nylon closure cap 3 is connected by means of two flexible nylon strips 13 to an ampoule support 14 provided with a recess 15 to receive the bottom of the ampoule 1. In this case the ampoule 1 adjoins the bottom 8 of the cylindrical bore 6 and the bottom 7 of the ampoule support 14. Since the bottom 8 of the bore 6 adjoins one end of the ampoule 1 one can, after a recess 9 has been formed at the correct depth in the wood (fig. 3) be certain that the ampoule will break at a certain time when the closure cap is driven from the top into the recess in the wood, so that the liquid composition will be released from the ampoule. The lower part of the outer side of the clsoure cap 3 tapers at least conically in the direction of the ampoule so that the penetration of such a closure cap into a cylindrical recess 9 in wood is easy and also a very good co-operation is obtained between the outer side 4 of the closure cap 3 and the inner wall 5 of the recess 9 in the wood, since the closure cap will be readily deformed when same is driven into the recess. It will be evident that very good results are obtained particularly with an assembly as shown in Figure 2. Figure 3 shows a special embodiment in which a sensor 10' is accommodated in the plastic closure cap 3 to measure the amount of composition 2 in the recess 9 in the wood after the fitting of the ampoule 1 and closing off this recess by the closure cap, thereby simultaneously opening the ampoule 1. For a very good maintenance programme it may also be desirable to measure apart from the composition the moisture content in the wood recess 9 at certain times, since an excessive moisture content indicates that new wood-preservative composition must be introduced into the recess 9 in the wood. In a preferred embodiment an additional amount of preservative composition may be introduced by piercing the cap 3 by a syringe needle and injecting the liquid composition through the cap 3. It was hitherto impossible to measure such conditions easily. In the embodiment according to fig. 3 the closure cap 3 is provided with a bore 6 widening conically from the bottom of the closure cap. Figure 4 shows another embodiment of the invention in elevation, in which the closure cap is provided with, preferably, conically extending recesses 16 disposed above each other. These recesses give the closure cap 3 good deformability. The annular ribs 17 formed by the annular recesses 16 are operative as clamping and sealing promoting means. Figure 5 is a reduced-scale cross-section of the closure cap of the invention as illustrated in Fig. 4 showing a bore 6a provided with ampoule retaining means, e.g. in the form of lips 18. The bore 6a in this case extends substantially conically in the direction of the top of the closure cap 3.

Claims: Claims: 1. An ampoule containing a wood-preservative composition, characterized in that the ampoule (1) is fixed to a closure cap (3) made of plastic material for closing a recess in wood for receiving said ampoule. 2. An ampoule according to claim 1, characterized in that the upper part of the ampoule (1) is clampingly received in a bore (6) in the closure cap (3). 3. An ampoule according to claims 1 or 2, characterized in that the upper part of the ampoule (1) is received in a bore (6) in the closure cap (3) of cylindrical form or widening conically into the direction of the inside of the closure cap (3). 4. An ampoule according to claims 1 to 3 characterized in that the closure cap (3) is connected with the ampoule by means of an adhesive, preferably one or more projecting lips (10) of the closure cap being connected to the ampoule (1) by means of an adhesive connection (11). 5. An ampoule according to claim 1 or 2, characterized in that the closure cap (3) is connected to a bottom ampoule support and in that the ampoule (1) co-operates with the closure cap (3) and the ampoule support (14). 6. An ampoule according to one or more of the preceding claims, characterized in that the closure cap (3) at least partially conically tapers at its outer side (4) into the direction of the ampoule (1). 7. An ampoule according to one or more of the preceding claims, characterized in that a sensor (10') is accommodated in the closure cap for measuring conditions in a recess (9) in wood closed by said closure cap (3). 8. An ampoule according to claims 1 to 7, characterized in that the closure cap (3) is provided on the outer side with clamping and sealing-promoting means (16, 17) preferably in the form of ribs (17) extending therearound. 9. An ampoule according to claims 1 to 8, characterized in that the ampoule retaining means (18) are present in the bore (6a). 10. A closure cap with bore suitable for use with an ampoule according to claims 1 to 9.

Inventors: BLOM, CORNELIS WILLEM
Applicants: WOODCAP B.V.
Application year: 1984
Main classification: B27K3
IPC codes: B27K3