referring to fig1 and 2 , the mousetrap according to a preferred embodiment of the invention includes an enclosure comprising a top ( 1 ), a base ( 3 ) and a closable aperture ( 5 ) within which a mouse is able to enter when the enclosure is in an open position . the mousetrap of fig1 depicts the enclosure in a closed position . the enclosure is able to be moved from the closed position to the open position by the substantial alignment of the aperture ( 5 ) in the top ( 1 ) and the base ( 3 ). ( see fig2 ) to set the mousetrap enclosure from the closed position to an open position , the user , such as a homeowner , manually rotates the top relative to the base ( 3 ) in the counter - clockwise direction until the indentation ( 7 ) is aligned with the aperture ( 5 ). fig2 shows the mousetrap when in the set position in which the aperture ( 5 ) and the indentation ( 7 ) are aligned . in order to more fully describe the mousetrap according fig1 and 2 , the mousetrap is depicted in fig3 with the top ( 1 ) omitted so as to show the internal parts of the mousetrap . the internal parts of the mousetrap comprise a trigger mechanism comprised of a lever arrangement ( 9 ) and a biasing means ( 11 ). once the mousetrap has been set ( i . e ., the aperture is in the open position ), a mouse will enter the enclosure through the aperture ( 5 ). the lever arrangement ( 9 ), when the mousetrap is in the set position , is engaged to a stop means ( 13 a ) by virtue of a lever ( 9 a ) having a arm ( 9 b ), connected to a pivot means ( 9 c ). the pivot means ( 9 c ) allows the lever ( 9 a ) to be raised . mice are very inquisitive animals and will thoroughly explore a new object put in their environment . in particular , mice will burrow and nest in confined spaces and they like to move with their body in contact with a wall . generally , mice prefer small , tunnel - like or narrow - sided angular enclosures that have dark interiors . dark interiors are generally explored before light interiors . as such , the configuration of the mousetrap according to this preferred embodiment is particularly attractive as the top ( 1 ) and base ( 3 ), fabricated from opaque materials , effectively form a tunnel - like enclosure with a dark interior . fig4 a shows how the mousetrap interior parts interact to allow the mousetrap to be set to trap a mouse and activated once a mouse has been trapped in accordance with a preferred embodiment of the invention . to set the trap , a user manually rotates the top ( 1 ) which is connected to a biasing means ( 11 ) in the anti - clockwise direction against the force of the biasing means ( 11 ) thereby storing potential energy within the biasing means ( 11 ). the top ( 1 ) is held in position ( so that the aperture ( 5 ) is open ) by engagement of the lever ( 9 a ) located on the lever arrangement ( 9 ) with a stop means ( 13 a ). the mouse being an inquisitive creature , will enter the enclosure through the aperture ( 5 ) and travel through the enclosure in the anti - clockwise direction until it reaches the lever ( 9 a ). due to its inquisitive nature and / or to the attractive odor of the bait , it will attempt to crawl through the gap ( 15 ) thereby causing the lever ( 9 a ) to raise . as the lever ( 9 a ) is raised , it disengages the stop means ( 13 a ) causing the top to contra - rotate under the force of the biasing means so that the enclosure assumes the closed position ( as is depicted in fig1 ). in another preferred embodiment of the invention , the enclosure is maintained in the open position against the force of the biasing means ( 11 ) by engagement of the stop means ( 13 a ) located in the interior of the top ( 1 ) ( as depicted in fig4 b ) with a releasable catch means ( 9 d ) located on the lever arrangement ( 9 ) as shown in fig4 c . as the mouse crawls through the gap ( 15 ) and raises the lever ( 9 a ), the lever arrangement ( 9 ) pivots by the pivot means ( 9 c ) and causes the releasable catch means ( 9 d ) located on the lever arrangement ( 9 ) to disengage the stop means ( 13 a ). once the lever arrangement ( 9 ) disengages the stop means ( 13 a ), the top ( 1 ) contra - rotates relative to the base ( 3 ) under the action of the biasing means ( 11 ) so that the enclosure assumes the closed position ( as depicted in fig1 ). the way in which the mousetrap is assembled is depicted in fig5 a and 5 b in which the mousetrap component parts are shown , respectively , in an exploded view in vertical alignment and also in section view . the mousetrap , in accordance with this particular embodiment , is fabricated from an injection mouldable material such as polypropylene and abs , however materials such as polyethylene and polystyrene would also be suitable . most of the component parts are adapted to snap into position and are assembled by a layering arrangement wherein the parts are sequentially arranged in position from the base ( 3 ) to the label ( 17 ) in the following way : the base ( 3 ) comprising a stop means ( 13 a ) is adapted to retain a lever arrangement ( 9 ) that fits about a spindle ( 19 ), followed by positioning of the top ( 1 ) with the biasing means ( 11 ) inserted in a cavity ( 21 ) within the top ( 1 ). the biasing means is operably connected to the top ( 1 ) and the base ( 3 ). in particular , fig4 a depicts how the biasing means fits in relation to the base ( 3 ) and in particular , the spindle ( 19 ) forming part of the base ( 3 ). the label ( 17 ) is then positioned over the top ( 1 ) so as to conceal the biasing means ( 11 ). fig5 b shows the sectional profiles of the top ( 1 ) and the base ( 3 ) to more clearly describe one possible method of configuring the top ( 1 ) and base ( 3 ) in such a way so that when in relation with the biasing means ( 11 ), contra - rotation of the top ( 1 ) relative to the base ( 3 ) under the force of the biasing means ( 11 ) is achieved . also shown in this embodiment are the bait vents ( 23 ) which allow the mouse to sense the bait ( not shown ) when placed within the bait housing ( 25 ). fig5 c shows the underside of the mousetrap , showing in particular , the bait housing ( 25 ) and how the bait may be inserted within the bait housing ( 25 ). this figure also shows the lip ( 27 ) on the base which allows one mousetrap to be stably and efficiently stacked on another mousetrap in accordance with a preferred embodiment of the invention . referring to fig6 a and 6 b , a mousetrap is depicted having stop means ( 13 a ) ( in this embodiment the stop means also acts as a strike plate ) ( 14 ) and a catch plate ( 13 ) that are be configured so as to have one or more projections ( 16 ). by virtue of these projections , more efficient incapacitation and / or kill of the mouse upon contact is achieved . in a particularly preferred embodiment , the projections are in the form of angular kinks in the strike and / or catch plate profiles . fig6 a depicts a mousetrap having a curved strike plate ( 14 ) profile and a curved catch plate ( 13 ) profile . the curved strike plate ( 14 ) profile assists in guiding the mouse to the bait housing ( 25 ) while the projections ( 16 ) on the strike plate ( 14 ) and catch plate ( 13 ) aim to increase the impact force on the mouse . fig6 b depicts a mousetrap having a strike plate ( 14 ) having multiple projections ( 16 ) ( in this case in the form of a kink and a spike ) and a catch plate ( 13 ) wherein the multiple projections ( 16 ) allow for different points of contact with the mouse thereby increasing the efficiency of incapacitation and / or kill . referring now to fig7 a , the mousetrap in accordance with another preferred embodiment of the invention is depicted in which a front perspective view of mousetrap depicts the enclosure ( 30 ) having an aperture ( 32 ) through which a mouse is able to enter . a rear perspective view of the mousetrap is depicted in fig7 b . this figure also depicts a slot ( 34 ) through which a tag ( 36 ) protrudes wherein the tag ( 36 ) is connected to the trap wire located with the enclosure interior . in this way , the trap wire ( shown in fig9 a ) is able to be set by a user externally of the enclosure ( 30 ). fig8 a and 8 b show how the trap mechanism is disposed within the enclosure ( 30 ). in fig8 a , the trap mechanism is in the set position in which the mouse , upon entry through the aperture ( 32 , see fig7 a , 7 b ), will travel through a gap ( 38 ) in the trap base ( 40 ) towards the rear of the enclosure ( 30 ). once the trap wire ( 42 ) is caused to move from a first position as is depicted in fig8 a to a second position as is depicted in fig8 b , the mouse will be trapped between the trap wire ( 42 ) and the enclosure floor ( 44 ). the trap mechanism according to a particularly preferred embodiment of the invention is depicted in the absence of the enclosure in fig9 a and 9 b . in this embodiment , the trap mechanism comprises a trap base ( 40 ), to which is connected a biasing means ( 46 ), a trigger ( 48 ) and the trap wire ( 42 ). the trap wire ( 42 ) is able to move from a first position ( the trap position ) ( as is depicted in fig9 b ) to a second position ( the set position ) ( as is depicted in fig9 a ) by pivot movement within a recess ( 50 ) formed within the trap base ( 40 ). to set the mousetrap , a user lifts and engages the trap wire ( 42 ) in the set position , the trap wire being retained in the set position against the force of the biasing means ( 46 ) by virtue of the shape of the base recess ( 50 ). that is , the trap wire ( 42 ), is held in the second ( or set position ) against the force of the biasing means ( 46 ) by an “ over centre ” spring action whereby the biasing means is extended , thereby storing potential energy , to an over - centre position and held in this over - centre position by engagement with an abutment ( not shown ) located within the recess ( 50 ). upon depression of the trigger ( 48 ) by the mouse , the biasing means ( 46 ) is caused to contract past the over - centre position at which point the biasing means continues to contract , by release of the stored potential energy , causing the trap wire to move from the first to the second position thereby trapping the mouse . the trigger ( 48 ) is adapted so that it too is raised as the trap wire ( 42 ) is raised from the second ( trap ) to the first ( set ) position . preferably , bait ( not shown ) is positioned on a bait housing ( 52 ) however due to their inquisitive nature , mice will still stand and depress the trigger ( 48 ) in the absence of bait . this will cause the trigger ( 48 ) to disengage from the trap wire ( 42 ), which through the force of the biasing means , will cause the trap wire ( 42 ) to move from the first ( set ) position to the second ( trap ) position , thereby trapping the mouse between the trap wire ( 42 ) and the enclosure floor ( 44 ). in this particular embodiment , the base is preferably formed from a injection mouldable component that is substantially rigid so as to withstand any stresses , such as bending or distortion of the enclosure , such that , advantageously , the trap mechanism is still able to function . in this way , the enclosure ( 30 ) may be fabricated out of a cheap material such as , for example , cardboard , but is still able to withstand any stress loads imposed on the mousetrap enclosure ( 30 ). preferably , the trap base ( 40 ) is fabricated from abs although materials such as polypropylene , polystyrene , pressed or folded metal , and wire forms are also suitable . it will be appreciated that the configuration of the trigger ( 48 ) in relation to the aperture ( 32 ) is such that after the mousetrap has been activated ( or triggered ), the aperture ( 32 ) is substantially closed so as to substantially conceal and isolate the trapped mouse from the external environment . fig1 depicts the mousetrap hung from , for example , a wall by a hang portion ( 54 ). in this way , the tab is used with pins , nails or screws to anchor the trap to narrow , raised surfaces such as , for example , shelves , roof or floor beams , rafters or ledges along which mice might be habitually travelling . the hang portion ( 54 ) may even be used for display or storage purposes . it will be appreciated by persons skilled in the art that numerous variations and / or modifications may be made to the invention as shown in the specific embodiments without departing from the spirit or scope of the invention as broadly described . the present embodiments are , therefore , to be considered in all respects as illustrative and not restrictive .
disclosed is a mousetrap having an enclosure with a rotatable top part having a downwardly extending strike plate within the enclosure , and a bottom part having an upwardly extending catch plate within the enclosure , an aperture in each of the top part and the bottom part which are in substantial alignment when the mousetrap is set , and a trigger mechanism , wherein the mousetrap is set to incapacitate or kill the mouse by the manual rotation of the top part relative to the bottom part when a mouse activates the trigger mechanism causing the top part to rotate relative to the bottom part and thereby incapacitating or killing the mouse between the strike plate and the catch plate .