IL24451A

IL24451A - Wall plug

Info

Publication number: IL24451A
Application number: IL2445165A
Authority: IL
Original assignee: Fischer Artur
Priority date: 1964-10-26
Filing date: 1965-10-13
Publication date: 1969-11-12
Also published as: DE1450987A1; FI45792C; ES318939A1; BE670338A; NL6513604A; CH444580A; GB1113394A; SE318085B; AT259211B; BR6573865D0; FI45792B

Description

•ninii |Π3 -ηιπΐ"τ m PATENT ATTORNEYS · Q'DIQD ' 3 PATENTS AND DESIGNS ORDINANCE SPECIFICATION Vail Plug ARTUR FISCHER, a Gerraan citizen, of Tumlingen, Kreis Freudenstadt, Germany do. hereby declare the nature of this invention and in what manner the same is to be performed, to particularly described and ascertained in and by t following statement : - 24451/2 This invention relates to a wall plug including an expansible sleeve and a conical expanding element arranged to be drawn into said sleeve by means of a screw.

It has already been proposed so to connect an expansible sleeve of a wall plug with an expanding element that the connection yields when the said element is drawn into the sleeve to expand the plug.

The present invention provides a wall plug comprising an expansible sleeve with an expansion element located at one end of the sleeve and arranged to be drawn into the sleeve when the same is in place in a bore in order to expand the sleeve into engagement with the bore, the sleeve bein formed from a plurality of separate longitudinally extending Shell portions each comprising a sector of the sleeve and the shell portions being connected together by means of projecting lugs and corresponding, recesses which are forced into engagement with one another so that the shell portions can r etain the expansion element between them until it is drawn into the sleeve whereupo the connections can yield to allow expansion of the sleeve by the spreading apart of the separate shell portions, in which the expansion element is retained within the sleeve and prevented from rotation therein by means of outwardly deformed lugs on said element, which lugs engage corresponding longitudinal slots in the sleeve. The plug according to the invention has the advantage that it can be manufactured in a simple manner.

The lugs on the expansion element are introduced 24451/2 into the slots in the plug sleeve prior to the assembly of the shell portions, the connection also securing the expansion element against being pushed out of the sleeve.

Advantageously the sleeve comprises two shell portions, Before connection of the separate shell portions together, the lugs thereof are still straight, enabling the two shell portions, punched without waste from a single metal sheet, to be made in one operation. By employing this method of manufacture it is easy to form the lugs and recesses in one operation with a punching tool. the recesses and lugs of the shell portions can be connected to one another by compression and bending.

This connection will yield when the expanding element is pulled into the. sleeve b means of a screw, and the two shell portions are thus enabled to expand in the bore drilled in the masonry.

The plug of the invention may also be. provided with several locking tongues deformed out of the walls of said shell portions. These locking tongues are intended to prevent the plug from rotating while the screw is tightened.

To prevent the internally threaded expanding' element from rotating, two or more lugs are punched outwardly from the front end of the elements, the lugs being introduced into slots of the plug sleeve prior to the assembly of the said shell portions. This connection, as well as securing the expanding element against being pushed out of the sleeve, also prevents its rotation relatively to the sleeve.

The sleeve of the plug may be constructed on the same principle if, instead of providing lugs, internally directed beads are embossed in the shell portions so ..as to engage a corresponding circumferential groove in the expanding element. This detachable connection again prevents the expanding element from being pushed out of the sleeve when the screw is introduced therein.

According to one embodiment of the invention, the other end of the sleeve from that at which the expanding element is attached is provided with an internally directed guide means for centering a screw to be threaded into the expanding element in order to draw the same into said sleeve.

The present invention further provides a wall plug comprising an expansible sleeve with a frusto-conical expanding element attached at one end of the sleeve and arranged to be drawn into the sleeve when the same is in place in a bore in said expanding element "being internally threaded to receive a screw by means of- which it can be drawn into the sleeve as specified and the sleeve being provided, at the other end from that at which the expanding element is attached, with a removable, sleeve insert for centering a screw as referred to. Thus in the case of inaccurately drilled plug holes it is possib3.e, after removing the sleeve insert, to introduce a screw into the sleeve and to thread it into the expanding element a little obliquely and from^. slightly eccentric position. This obviates the necessity of drilling a fresh hole.

The said sleeve may be formed of synthetic plastics material or of metal and it may be slotted or it may consist of two detachable shell portions as referred to above, so that the expanding cone is enabled to spread the sleeve in the masonry . more easily when the metal screw is tightened.

Advantageously the internal diameter of the said sleeve insert slightly exceeds the diameter of a .screw for which the expanding element is threaded. The said sleeve insert may be formed of synthetic plastics material.

The invention is illustrated by way of example in the < accompanying drawings in which: Fig. 1 is a plan view of a stamped out sheet metal blaiik for the construction of a shell portion to form part of a plug sleeve, Pig. 2 is an end view of two such shell portions prior to assembly thereof to form a sleeve, Pig. 3 is an elevation of a plug sleeve with an expanding element attached, Fig. 4 is a view corresponding to Pig. 3, with the plug turned through 90° and shown partly in section, embodiment of plug assembly, Fig, .7 is a cross section of two shell portions of a plug sleeve as shown in Pig. 6, shovm in their positions prior to assembly thereof to form the sleeve, Fi o 8 is an elevation, partly in section of yet. another embodiment of plug assembly, and Fig. 9 is an elevation of one component of the plug -assembl of Fig. 8.

Referring to Figs. 1-5 of the drawings, two shell portions 1,2 of a wall plug are punched as flat blanks f om a single metal sheet with the same tool - see Fig. 1 in which the blank 1 is shovm in full lines and the blank 2 in broken lines, the blanks being shown in the relative positions in which they are punched from the sheet . The shell portions 1,2 have lugs 3, 3& and recesses 4, 4a, and also slots 5» Prior to connection of the shell portions together to form a sleeve, the lugs 3 of the flat blanks which have now been formed into shells, are still straight, see Fig. 2 in full lines. On assembly of the shell portions, lugs 3» 3a and the recesses 4, 4a are force-fitted to one another by deformation as shown in broken lines in Fig. 2. locking tongues 6, 7 %are pressed out from the walls of the shell portions 1, 2, see Figs. 4 and 5, the tongues 6, 7 being directly adjacent the slots 5, see Fig. 3· Also surfaces of the shell portions 1, 2 are roughened, see Figs. 3 and 4.

A frusto-conical expanding element 8 is internally provided with a thread 9. · lugs 10, 10a are punched from the front end of the element 8 to serve as means of connection with the sleeve 1 , 2. These lugs are introduced into the slots 5 prior to the assembly of the shell portions together, so that connection also serves as a safeguard against rotation of the element 8 relatively to the sleeve 1 ,2.

Another embodiment of the invention featuring a sleeve 1 ,2 connected to an expanding element 8 is illustrated in Pigs. 6,7. In this embodiment the element 8, instead of being provided with lugs 10,10a, has a groove 11 into which positioning beads 12 of the shell portions 1,2 can engage. This connection becomes detached as a screw (not shown) is tightened, and the expanding element 8 is drawn into the interior of the sleeve 1 ,2 to force apart the separate shells 1 and 2. The beads 13 at the other end of the sleeve 1,2 serve as guiding means for the screw. In the embodiment of Pigs. 3>4 the flanged part 1 of the sleeve constitutes a guiding means for the screw.

In the embodiment of plug shown in Pigs. 8 and 9 the sleeve ggnjiitg. Qf two det ch ble sh§l! portions 21,22 w ioh are connected to one another in a force-fitting operation as described above by way of lugs 22a. That end of the sleeve to be introduced into the plug bore is connected to an expanding element 23 by means of lugs 23a. The element 23 is internally threaded at 24 to receive a metal screw 25. When this screw is tightened the element 23 is drawn into the sleeve and expands the shell portions 21,22.

A sleeve insert 26 having an aperture 26a is arranged in the sleeve 21,22 to guide and centre the screw 25 in the direction towards the internal thread 24 of- the element 23.

Should the presence of the centering insert 26 prove disadvantageous when holes have been drilled inaccurately, it can be removed from the sleeve during insertion of the screw 25 and on replacement it acts as a compensating means for realigning the screw 25. After the removal of the sleeve insert 26 the that of the expanding cone 23. In other words, the eccentric position of the screw 25 does not prevent the. latter from finding the thread 24 of the cone 23 because, as experience has shown, the cone 23 ada.pts itself to the position of the screw 25· The sleeve insert 26 may be manufactured from metal or synthetic material, g^j^ ROy particularly described and ascertained the ¾e performed, 1 d90lare~~t¾at~*¾a I claim ie 1. .. A wall plug comprising an expansible sleeve with an expanding element located at one end · of the sleeve and arranged to be drawn into the sleeve when the same is in place in a bore in order to expand the sleeve into engagement witi said bore, the said sleeve being longitudinally divided into a/plurality of "separate shell portions and said shell portions being so detachably connected together that they ca/retain the expanding element between them until it is drawn into the sleeve whereupon the connections can yield to allow expansion of the sleeve by spreading apart of the separate shell/portions.. 2. A wall plug as claimed in claim 1 , i which the sleeve comprises two shell portions connected together as specified by means of projecting lugs and corresponding recesses forced into engagement with one another. 3« A wall plug as claimed in claim 1 or 2, in which the expanding element is retained within the sleeve by means of outwardly deformed lugs on said element, which lugs engage corresponding longitudinal slots in the sleeve. 4o A wall plug as claimed in claim 1 or 2, in which the expanding element is retained within the sleeve by means of internally directed peripheral beads on the said shell portions, which beads engage s. corresponding circumferential groove on

Claims

1. A wall plug comprising an expansible sleeve with an expa sionjelement located at one end of the sleeve and arranged to be drawn into the sleeve when the same is in place in a bore in order to expand the sleeve into engagement with the bore, the sleeve being formed from a plurality of separate longitudinally extending shell portions each comprising a sector of the sleeve and the shell portions being connected together by means of projecting lugs and corresponding recesses which are forced into engagement with one another so that the shell portions can retain the expansion element between them until it is drawn into the sleeve whereupon the connections can yield to allow expansion of the sleeve by the spreading apart of the separate shell portions, in which the expansion element is retained within the sleeve and prevented from rotation therein by means of outwardly deformed lugs on said elemen t which lugs engage corresponding longitudinal slots in the sleeve.

2. A wall plug as claimed in Claim 1 in which the sleeve comprises two shell portions.

3. A wall plug as claimed in Claim 1 or 2, in which the said sleeve is provided with outwardly directed locking tongues for engagement with the plug bore,

4. A wall plug as claimed in Claim 3, in which the said locking tongues, are integral with said shell portions, comprising lugs outwardly deformed from the walls thereof* 24451/2

5. Λ wall plug as claimed in Claims 1 and 4, in which the locking tongues are immediately, adjacent the said slots.

6. A wall plug as claimed in any one of Claims 1-5» i whic the expansion element is internally threaded to receive a screw by means of which it can be drawn into the sleeve,

7. A wall plug as claimed in any one Of Claims 1-6, in which the expansion element is of frusto-conical shape.

8. A wall plug as claimed in Claim 6 or 7, in which the other end of the sleeve from that at which the expansion element is attached is provided with guide means for centering a screw to be threaded into the expansion element in order to d raw the same into said sleeve.

9. A wall plug as claimed in Claim 8, in which the guide means is constituted by a removable sleeve insert provided at the other end of the sleeve from that at which the expansion element is attached.

10. A wall plug as claimed in Claim 9» in which the internal diameter of the said sleeve insert slightly exceeds the diameter of a screw for which the expanding element is threaded*

11. A wall plug as claimed in Claim 9 or 10, in which the sleeve insert is formed of synthetic plastics material.

12. A wall plug substantially as described herein with reference to Figs. 1-5 of the accompanying drawings.

13. A wall plug substantially as deecribed herein with reference to Pigs. 6 and 7 of the accompanying drawings. For the Applicants ARTHERS IS/rb