US2616136A - Demountable attachment structure - Google Patents

Description

1952 J. G. KRONOUER ETAL 2,616,135

DEMOUNTABLE ATTACHMENT STRUCTURE Filed Feb. 6, 1947 ill ya v fi 5 ZUUJUIH. al .IHIH ll" INVENTOR J-G. KRONOUER J.C.A. RECOURT HGENT Patented Nov. 4, 1952 DEMOUNTABLE ATTACHMENT STRUCTURE Johan George Kronouer and Johannes Christoffel Antonie Recourt, Eindhoven, Netherlands, assignors to Hartford National Bank and Trust Company, Hartford, Conn., as trustee Application February 6, 1947, Serial No. 726,758 In the Netherlands March 1, 1944 Section 1, Public Law 690, August 8, 1946 Patent expires March 1, 1964 2 Claims.

In the case of many plate-like objects the problem is to be faced how to provide an attachment on a surface of such a plate which may be subjected to the stress of a force parallel to the surface. The most simple solution of providing such an attachment piece would be to drill an aperture in the material and to introduce a screw or a rivet into this aperture, with which the piece could be secured. Such an attachment, however, is often disfiguring, if a comparatively thin wall that must keep up a smooth surface on the side remote from the member is concerned. In addition the surface may be provided with an extension, for example in the form of a knob integral with the plate. If the latter is made from moulded material, for example synthetic resin, the formation of this extension entails many dfilculties when it is across the direction of moulding. With objects of this kind, particularly with cabinets for wire less sets, it is therefore customary to provide the wall of the cabinet on the inside with a rib having drilled in it an aperture in which a screw can be inserted. The rib lies in the direction of moulding.

A disadvantage accruing to this method is that the rib must be comparatively thick. The difference in wall thickness resulting therefrom leads to strains in the material. Also, since the rib, owing to the fact that the cabinet is moulded, must extend as far as the front wall of the cabinet, a fairly high amount of material is lost in this construction. Also, the tapping of thread in the rib is fairly involved; it leads to breakage of the material.

The invention relates to a construction in which these advantages do not occur.

According to the invention, which concerns a plate made of moulding material and provided with an attachment member which may be subjected to tensile stress by a force parallel to the plate, the member engages a transverse slot provided in the top surface of a rib which is moulded so as to be integral with the surface.

When moulding this plate, which may form part of a larger object, for example of the cabinet of a Wireless set, care will naturally be taken that the rib lies in the direction of moulding.

This rib may be very light, so that it requires plate by making it engage recesses provided in the sides of the rib. It may be formed in the" shape of a strip bent-out at right angles, one

will now be set out more fully with reference tothe accompanying drawing, in which:

Figure 1 is a perspective view of the inside part of a wireless cabinet showing an example of a well known attachment.

Figure 2 represents by way of example, one embodiment of the invention.

Figure 3 is an enlarged perspective view of the rib of Figure 2 and Figure 4 is an enlarged plan view of the attachment member of Figure 2.

As shown in Figure 1, the known attachment usually comprises a rib 2 formed on the bottom side I of a cabinet which rib is made integral therewith. An aperture 3 is drilled in this rib and provided with a screw thread. By means of a screw inserted in this aperture it is, for example, possible to secure a rear panel to the cabinet.

The wall I of the cabinet shown in Fig. 2 is provided with a rib 2 having a rectangular crosssection. The surface of this cross-section need be but small. The top surface of this rib is provided with a transverse slot 4 which is engaged by the attachment member 5. This attachment member is formed in the shape of a resilient plate bent-out at right angles. One of its sides is secured to the rib, due to the fact that it has the shape of a keyhole 6, so that an edge I is formed which is caused to lie in the transverse slot 4. In addition, the window 6 exhibits two lateral edges having lips 8 which are capable of engaging recesses 9 provided in the sides of the rib. In order to secure this plate to the rib, the transverse strip 1 is slid over the surface of this rib and the attachment member is slightly bent through so that the parts 8 may slide into the recesses 9. If the member is thus slid over the rib, the transverse strip 1 will drop into the transverse slot 4 at a given moment and engage it resiliently. The other side of the attachment member may be provided with a screw aperture l0.

3 What we claim is: '1. In combination with a removable attachment member, a molded article comprising a molded p1ate,-a rib, member integrally molded with saidplate, said rib member having an end provided with longitudinal undercut grooves,

said rib member also having remote from said end a groove extending transverse'to the longitudinal axis of said rib, said removable attachment member engaging said rib member said attachment member havinglaresilientpart ex tending substantially parallel to said plate, said resilient part having a key-hole-shaped opening through which a portion of said rib memben-ex-g. tends, said resilient part also having, longi-f tudinallv extending lips defining the, narrower. end of said key-hole-shaped opening and an ,end.

portion extending transversely to the longitudinal axis of said resilient part, said end portion defining the end of said key-hole-shaped opening opposite to said--narrower ;end, said lipsextendin l'in i said longitudinalgrooves 1 and? said end :portion' extending in -said transverse groove,

said attachment member having a second part integral with said resilient part but at an angle thereto and said'second part'having means gfor receiving;an-;attachment.,

2. In a;molded article having a first molded plate, a second molded plate at right angles'to and integral with said first plate, a rib member integrallyrmolded with said plates and extending along said first plate up to and at. right anglestosaid second plate, said rib member, having a body portion adjacent saidsecond plate andan end portion, theimprovement consisting of said body; portion havinga groove therein extending transverse to the longitudinal axis ofsaid rib member between said end portion and said second plate, said rib member having longitudinal grooves provided insaid end portion, a removable iattachment member engaging said rib member, said attachment member comprising a resilient part having a key-hole-shaped opening through which a portion of said rib membenextends, said resilient part also having longitudinally extending lips defining the narrovver end of said key-hole-shaped opening and anen'dyportion extending transversely to the longitudinal axis of said resilient part, said end portion of the resilient part defining the end of said key-holegshaped opening opposite to said -narrower end;.:said lips extending in said longi- REFERENCES CITED' The. following references are of ,recordrin. the

file.. of this patent:

UNITED STATES PATENTS Number Name Date- 95,504 Murray Oct-5, 1869 1,742,141 Hicks Dec. 31, 1929 2,142,263 Regenhardt May-20, 1941- 2,243,065 Barrett May;27,'1941 2,345,650 Attwood Apr.-4, 1944'-

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