Lockable mounting for retaining a removable item to a base
This INVENTION relates to a means for lockably retaining a removable member to a base. 
     In one form the invention resides in a lockable mounting for retaining a movable item to a base comprising a male and female element to be supported by the removable item and base respectively or vice versa, said male portion having a disc like configuration and the female portion formed with an aperture of corresponding configuration wherein the outer most portion of the aperture is of reduced dimensions, said male portion being formed at one side with at least one lateral protrusion at its outer most face. 
     According to a preferred feature of the invention said base comprises the cooking surface or a stove. 
    
    
     The invention will be more fully understood in the light of the following description of one specific embodiment. The description is made with reference to the accompanying drawings of which: 
     FIG. 1 is a schematic sectional elevation showing a removable item associated with the locking means of the embodiment; 
     FIG. 2 illustrates an alternative form of locking means; 
     FIG. 3 is an underneath view of a first element of the locking means; and 
     FIG. 4 illustrates a number of variations of configuration of the elements of the locking means of the embodiment. 
    
    
     The embodiment is directed towards a locking means which has particular application for retaining cooking utensils such as saucepans, pans and the like on the cooking surface of the stove. It is well known that the kitchen is one of the most dangerous localities in a house and in particular the stove area which when in use supports a number of different pots and pans each containing hot contents and each of which may be readily tipped over if mis-handled. This danger is particularly great where young children are present who cannot see what is in the saucepan and who as a result of their curiosity may pull the handle of the saucepan causing its contents to be tipped on them. Many children are seriously injured or killed as a result of such incidents. 
     It is an object of the embodiment to provide a means of retaining such pots and pans on the cooking surface to prevent accidental dislodgement and yet facilitate ready removable of such pots and pans when desired. 
     The embodiment comprises a locking means consisting of two elements, the first element is to be applied to the underneath of a pan or saucepan or may be formed integrally therewith. The first element comprises a pair of circular discs of equivalent dimension wherein a first disc 13 is bonded or otherwise affixed to the underneath of a pan and the second disc 14 is bonded or otherwise fixed to the first disc but is displaced slightly off centre from the first disc such that a portion of the second disc extends beyond the perimeter of the first disc 13 to define a flange 18 spaced from the base of the utensil 12. If desired the first element 11 may be formed integrally into the base of the pan and if desired the first and second discs 13 and 14 may be formed integrally. 
     The second element 15 of the embodiment is to be mounted over the cooking zone whether it be an electric hotplate or ring or a gas burner, and comprises an aperture 16 formed in a support 17 having a configuration corresponding to the configuration of the first and second disc 13 and 14. The thickness of the support 17 is less than or equal to the thickness of the first disc 13 or spacing of the flange formed by the second disc 14 from the underneath of the cooking utensil 12. 
     As shown at FIG. 1 the support 17 may comprise a planar surface or as shown at FIG. 2 may comprise a ring. 
     In use the first element is located on the base of a saucepan integrally or otherwise such that the flange is remote from the handle of the saucepan (as shown in phantom in FIG. 1). To locate a saucepan onto the base the saucepan is tipped slightly such that the flange formed by the second disc 14 is lowermost in order that the flange can be inserted underneath the support 17 to allow the remainder of the first element 11 to be located in the aperture 16. Once in position the pan cannot be accidently tipped by downward pressure on the handle which is the most likely event where young children are present. In addition the saucepan cannot be displaced laterally from its position on the stove unless one side of the saucepan remote from the flange is lifted slightly and the pan is moved obliquely upwardly away from the support 17 as shown by the arrow A of FIG. 1. 
     Where the aperture in the second element is circular the saucepan can be rotated about a vertical axis without the locking elements becoming dislodged. 
     It should be appreciated that the degree by which the second disc may be mounted off centre from the first disc can be varied according to the circumstances in which the element is to be used. In addition the first element may be located in association with the working zone and the second element mounted to the cooking utensil. 
     As shown at FIG. 4 the first and second element need not be restricted to the particular configuration shown at FIGS. 1, 2 and 3. The principal feature of the first element resides in the flange 18 which is formed to one side due to the outer face of the first element having a greater area than the inner face. The aperture 16 of the second element 15 has an opening corresponding in size to or slightly larger than the minimum area of the first element and is symmetrical in cross-section wherein the internal wall of the aperture has a cross-sectional configuration corresponding substantially to that of the edge of the second member in the region of the flange 18. Where the cross-sectional configuration of the internal wall of the aperture 16 and the flanged portion of the first element are not the same, the configuration should be such that there is positive engagement between the two with the minimum of free play. 
     It will be appreciated that the second element 15 may take the form of a plate as shown at FIG. 4 or a base with the aperture 16 machined into the upper surface of the base of limited depth depending on the thickness of the first element. 
     If desired the flange may be discontinuous to take the form of a series of lugs around the first element. Alternatively the flange may take the form of a single lug. 
     In addition the first and second element need not be of a circular configuration but may be of elliptical polygonal any other suitable shape. 
     It should be appreciated that the scope of the present invention need not be limited to the particular scope of the embodiment described above. In particular the invention need not be limited to the application described in relation to the embodiment and may be used in any situation where is desired to positively locate an item on a base to prevent accidental dislodgment of that item or tipping of that item. 
     Other applications of the invention may include means for lockably mounting items such as computers, calculators, typewriters, televisions, clothing irons, telephones and the like to a base. If such a mounting was used the item is positively held to the base but is readily removed and the item may be readily rotated on the base without any danger of the item being tipped over or dropped.