the preferred embodiment of a fish trap according to the invention comprises a foldable frame , having an elongated crossbeam 2 hingedly coupled to an elongated mast 5 . preferably , the crossbeam and mast are hinged at a hinge point 4 about their mid - length . a stabilizer bar 8 is hingedly coupled at , or adjacent to , each end of the crossbeam 2 . preferably the trap may be folded to reduce its size when not deployed as shown in fig9 . other portions of the trap , and the manner by which they cooperate in various embodiments , will be explained below with reference to various drawings . fig1 depicts a schematic perspective view of the fish trap according to the preferred embodiment of the invention , fig2 depicts a top view thereof , and fig3 depicts a frontal elevation of the trap in operational state indicated a caught fish . in fig2 and 3 the trap is shown in a deployed disposition over an ice hole 6 . crossbeam 2 extends horizontally over the ice hole 6 , and stabilizer limbs 8 , preferably bar shaped , are extended at a horizontal angle thereto . preferably each of the stabilizer limbs extends at or about 70 °- 80 ° to the longitudinal axis of the crossbeam , and at opposite sides thereof , so as to generally approximate a z shape as shown in fig2 . however varying angles are contemplated as may be required to better fit ice conditions , and the like . in order to allow folding of the trap to as small volume as possible , it is desirable that the stabilizer limbs be hingedly coupled to the crossbeam , and that an angle limiter such as a string , wire , or arc , be provided to limit the angular range of motion of the stabilizer limbs / bars 8 relative to the crossbeam . this arrangement provides high level of stability and resistance to tipping of the trap due to wind or a fish pull . due to the use of a simple , relatively narrow crossbeam 2 , the trap causes only small obstruction of the ice hole , while the stabilizer bars 8 provide excellent stability . in certain embodiments , one or more ice pick 12 are provided , extending downwardly from the stabilizer limbs and / or from the crossbeam , to engage the ice and increase stability and resistance to pull such as when a fish is hooked . in operational disposition , mast 5 extends substantially vertically so that a top portion thereof extends generally upwards from the point of intersection 10 with the crossbeam 2 , while a bottom portion extends generally into the ice hole , from the point of intersection 10 . a reel 20 capable of holding a length of line and a hook is rotatably mounted to the bottom portion of the mast 5 . the reel is equipped with a tab 22 . the reel is used for receiving a length of fishing line and a hook , as known . fig4 a - 4 e depict a detailed view of parts of the trigger mechanism according to the described embodiment . a trigger rod holder 25 , shown in fig4 a , is mounted to the mast , and extends along at least a portion of its length . preferably , trigger rod holder 25 comprises a tube having narrow openings at its extremities , the openings being dimensioned to receive a trigger rod 30 and allow it to rotate freely at least along an arc centered at its longitudinal axis x - x . preferably , the trigger rod holder contains a lubricant to reduce rotational friction of the trigger rod . more preferably , a seal is applied to the openings inside the tube to facilitate lubricant retention . however trigger rod holder may be accomplished with any convenient mounting method such as an open tube , staples , track , and the like , that will allow the trigger rod to rotate about its longitudinal axis x - x . trigger rod 30 is disposed in trigger rod holder 25 . the trigger rod has a long straight part , which is referred herein as the longitudinal axis thereof , depicted as x - x in fig4 a . the preferred embodiment calls for mounting the trigger rod at a slight angle to the mast length , but this is optional . at its lower part , the trigger rod has an elbow 32 extending towards the reel , and disposed so as to be operated upon by a tab 22 which rotates with the reel . the movement imparted by the tab causes trigger rod to rotate within the trigger rod holder . at its upper part , trigger rod has a trigger hook 35 , which rotates therewith . fig4 b depicts a top view of the trigger rod and the trigger rod holder , showing the trigger hook . fig4 c and 4 d depict an example of a trigger bolt 55 according to the preferred embodiment . the trigger bolt has a stabilized end 56 , a retainer 57 used to couple the trigger bolt to indicator spring 40 , and a hook receiver 58 . the hook receiver is dimensioned to receive therein the trigger hook . an indicator spring 40 is mounted to the mast 5 and acts as a resilient tip - up indicator . preferably , indicator spring is a flat steel spring , and is slidably mounted alongside the mast . spring guides 41 , 42 , are provided to maintain the indicator spring in place , to allow convenient storage of the spring when the trap is not in use . when the trap is in use , the indicator spring is withdrawn from the guide . preferably , the spring guide , or a portion thereof , applies adjustable pressure to the spring , such as by using a pressure member to urge the spring against the mast spine . the specific method of providing adjustable pressure is a matter of technical choice clear to the skilled in the art . a flag , pendant , or similar visual indicator 45 is preferably attached to the indicator spring . the indicator spring 40 has an attachment hole 43 , or other attachment mechanism at its distal end as shown in fig4 e when operational , the indicator spring 40 is extended so as to have its proximal end 44 at or near the top of the mast 5 . indicator spring 40 is bent towards the trigger hook region , so as to exert some pull to the trigger bolt against the trigger hook , however the spring is elastically urged to obtain a vertical , or near vertical disposition when released . fig5 a depicts a front view of the trigger mechanism in pre - deployed state , and fig5 b depicts the same parts in similar dispositions viewed from the side . trigger bolt 55 is preferably coupled to indicator spring 40 via a coupler 50 . the coupler 50 , preferably ring shaped , acts to absorb forces and vibration created by wind gusts and the like , and reduce their effect on trigger bolt 55 . the coupler is attached to the distal end of the indicator spring via attachment 43 , which is preferably a hole in the spring . it is noted that the coupler may be any link providing flexible coupling link between the indicator spring and the trigger bolt , such as a piece of material having one or more holes . the term ring as applied to the coupler 50 should be construed as any shape that is closed and may be extended to a polygon and the like . in the preferred embodiment trigger bolt 55 is made of stiff wire . a loop formed at one end thereof is used as retainer 57 . retainer 57 is coupled to the indicator spring , either directly , or preferably via the coupler 50 . the trigger bolt 55 further has a hook receiver 58 dimensioned to receive the trigger hook . the trigger bolt further has a stabilized end 56 which is dimensioned to be at least partially slidably received within a bolt guide 59 . in fig5 a and 5 b the trigger bolt is seen ready to be armed . the trigger bolt 55 is seen disposed to be pushed into the bolt guide 59 , so as to allow trigger hook 35 to engage the hook receiver 58 . fig6 depicts the armed trigger mechanism . to arm the fish trap , the stabilized end 56 of the trigger bolt 55 is inserted in bolt guide 59 , which in the preferred embodiment is a hole drilled in the mast 5 . trigger rod 30 is rotated as indicated by arrow 36 in fig5 a , and engages hook receiver 58 . the rotation further brings elbow 32 to a position where rotation of the reel will cause tab 22 to urge the trigger rod to be rotated against the direction of arrow 36 . fig7 shows top view detail of the trigger hook and trigger bolt while the trap is armed . a turn of the reel 20 , such as due to a fish taking the bait and getting hooked on the hook , will cause the tab 22 to engage elbow 32 and to act thereupon to rotate trigger rod 30 , which in turn causes the rotation of trigger hook 35 in the opposite direction of arrow 36 . thus , trigger hook 35 disengages from hook receiver 58 , freeing the trigger bolt . a component 44 of the force exerted by indicator spring 40 urges the trigger bolt to be released from bolt guide 59 , and thus the indicator spring is released and moves to the vertical position , indication a fish is hooked . the guided stabilized end provides excellent stability and resistance against false triggering . further protection and shock absorption is provided by the optional coupler 50 , which preferably is made of resilient material to further its shock absorption capacity . typically , the stabilized end 56 is situated away from the hook receiver towards the mast 5 , and bolt guide 59 is bored in the mast 5 , forward of the hook receiver . this trigger bolt arrangement provides improved stability as the forces exerted by wind and vibration are directed along the trigger bolt and the trigger hook engages the hook receiver that is stabilized against lateral and / or vertical movement . it is noted that the trigger bolt 55 , and trigger bolt guide 59 may take any convenient shape as long as it provides the necessary hook receiver and stabilized end of the trigger bolt that engages the bolt guide in armed state . thus for example fig8 a and 8 b depict a top and side views respectively , of an alternative embodiment where the trigger bolt 55 a is made of a twisted sheet material . the bolt guide 59 a in this embodiment is constructed to receive a stabilized end of the trigger bolt that is flat . fig9 c and 9 d depict a front and side view respectively of bolt guide 59 a of such an embodiment . fig8 e and f depict a front and top view of the alternative trigger bolt 55 a showing the bolt that can easily be punched out of sheet material with the retainer 57 a and the trigger bolt receiver 58 a are pre - cut as part of the punching process . the punched bolt 55 a is than given a twist that will position the retainer portion 57 a at an angle to the portion containing stabilized end 56 a and bolt receiver 58 a . alternatively , a twist may be entered in coupler 50 ( not shown ) and trigger bolt 55 may be flat , however if utilizing a flat trigger bolt it is desirable to have the stabilized end lie naturally at about 90 degrees to each other in relation to their respective flat sides . the manner of building the trigger bolt and cooperating guide , as well as the hook receiver and cooperating trigger hook , and the large umber of the variations available thereupon , are a matter of technical clear to the skilled in the art in light of the teaching of these specifications . it should be noted that the directions provided herein are approximate and relate primarily to an ideally situated trap in an operational position . variation from this ideal position are very common and are not significant to the operation of the invention . by way of example , a crossbeam is likely not to lie exactly horizontal due to varying surface conditions , the angle between the mast and the crossbeam may vary and the mast may often stray from the precise vertical disposition . similarly slight angular and spatial variations may exist regarding the trigger mechanism or stabilizer bars are also common . however the teaching of these specifications should be taken to encompass such common variations . the term z shape should be construed to mean an elongated center section with two limbs extending at any angle , at opposite sides of the center section , each of the limbs being at a different side of the midsection point of the center section . yet another aspect of the invention is the trigger bolt 55 as shown in fig4 c and 4 d . the trigger bolt is preferably made of substantially rigid tube , such as a stiff wire , and having a retainer loop formed at one end thereof , a hook receiver loop formed in the wire , and dimensioned to receive the trigger hook , and a stabilized end . the retainer loop and the hook receiver loop each form a loop plane in which the loop substantially lies . the retainer and hook receiver loops are formed at some angle relative to the longitudinal axis of the stabilizing end 56 . preferably this angle is a right angle , but other angles are also considered . the trigger bolt may then be provided as a conversion kit , and be used for converting existing traps to traps having the improved trigger mechanism described herein , by drilling a hole in mast 5 which acts as bolt guide 59 , and attaching the trigger bolt to the indicator spring . it will be appreciated that the invention is not limited to what has been described hereinabove merely by way of example . while there have been described what are at present considered to be the preferred embodiments of this invention , it will be obvious to those skilled in the art that various other embodiments , changes , and modifications may be made therein without departing from the spirit or scope of this invention and that it is , therefore , aimed to cover all such changes and modifications as fall within the true spirit and scope of the invention , for which letters patent is applied .
an ice fishing trap comprising in its operational state a crossbeam dimensioned for extending across a hole in ice covering a body of water , and a hingedly coupled vertical mast . the vertical mast has a rotatable reel dimensioned to carry a length of fishing line and a hook . a trigger mechanism is provided , wherein a rotation of the reel causes an arcuate movement of a trigger hook . one aspect of the invention provides at least two stabilizer limbs hingedly coupled to the crossbeam , so as to form a general z shaped support base when operational . in another aspect the fishing trap provides a trigger bolt coupled to an indicator spring , wherein the trigger bolt is utilized to couple the indicator spring to the trigger hook . the trigger bolt is slidingly supported by bolt guide , thus providing improved resistance to false indications due wind vibration and the like . preferably , the trigger bolt is coupled to the indicator spring by a ring shaped coupler .