the fish indicator 10 of the present invention shown in fig1 a , 2b , 3a , 3b and 3c includes opaque plastic housing 12 manufactured by injection molding . housing 12 had elongated battery compartment 14 for battery 15 and enclosure 16 for pcb 18 , beeper or speaker 20 and on / off switch 22 . the approximate overall dimensions of housing 12 were 19 / 16 inches ( 4 cm ) in height , 15 / 8 inches ( 5 cm ) in width and 3 . 25 inches ( 8 . 3 cm ) in length . compartment 14 was 11 / 2 inches ( 3 . 8 cm ) in height , 7 / 8 inches ( 2 . 2 cm ) in width and 17 / 8 inches ( 4 . 6 cm ) in length . enclosure 16 was 19 / 16 inches ( 4 cm ) in height , 15 / 8 inches ( 5 cm ) in width and 1 inch ( 2 . 6 cm ) in length . transition region 24 between compartment 14 and enclosure 16 consisted of slanting top 26 extending between enclosure top 28 and compartment top 30 , right slanting side 32 extending between enclosure right side 34 and compartment right side 36 , and left slanting side 38 extending between enclosure left side 40 and compartment left side 42 . the length of each of slanting top 26 and right and left slanting sides 32 and 38 was approximately 1 / 2 inch ( 1 . 5 cm ). removable bottom 44 of housing 12 extended between front 46 and back 48 . back 48 had four slots 49 ( fig1 ) for allowing the audible tone from speaker 20 to be easily heard . housing 12 was mounted on conventional rod 50 by means of rubber strip 52a with adjustment holes 52b that was stretched around rod 50 . specifically , housing 12 was attached in one embodiment of the present invention , by means of two velcro fastening tape pads 54 glued to curved groove 56 of bottom 44 ( fig3 b ), two corresponding velcro interlocking tape pads 57 wrapped around rod 50 adjacent reel 58 and rubber strip 52a wrapped around rod 50 . one of the holes 52b in each of the ends in strip 52a was stretched to fit over boss 59a on right side 36 and boss 59b on left side 42 of compartment 14 as shown in fig2 a and 3a to permit indicator 10 to be easy mounted onto and dismounted from rod 50 . to periodically replace battery 15 or other indicator components , bottom 44 was removed from the remaining portion of housing 12 by holding the edges of bottom 44 and pulling right side wall 36 and left side wall 42 up and away from rod 50 . inner side walls 60 of bottom 44 have a tight fit connection with peripheral indentation 61 on each of right side walls 34 and 36 , left side walls 40 and 42 , right and left slanting walls 32 and 38 and front 46 and back 48 of housing 12 as shown in fig2 b . in addition , bottom 44 preferably is bolted to housing 12 so that bottom 44 does not separate from housing 12 due to violent action during use . specifically , bottom 44 has a bolt sleeve ( not shown ) molded to extend upward approximately equal in height to the interior height of enclosure 16 . the inner side of enclosure top 28 has a corresponding self - threading sleeve to accept the bolt . after fish indicator 10 was mounted to rod 50 , fishing line 60 was threaded through loop 62 of oscillating arm 64 and guides 66 and tied to hook 68 ( fig1 ). loop 62 can be closed , but preferably loop 62 was open as shown for the convenience of threading line 60 therethrough . oscillating arm 64 had first lateral section 70 having first end 72 through opening 74 in right side 34 of enclosure 16 ( fig3 a - 3b ). first lateral section 70 extended laterally through enclosure 16 and opening 76 in left side 40 of enclosure 16 to longitudinal section 78 adjacent left side 40 . longitudinal section 78 was substantially perpendicular to first lateral section 70 and extended generally along the longitudinal axis of rod 50 to a position below rod 50 . loop 62 in second end 80 of oscillating arm 64 was on second lateral section 82 which was also substantially perpendicular to longitudinal section 78 . loop 62 was positioned for maintaining line 60 directly below reel 58 during the non - indicating mode of indicator 10 as shown in fig2 a . orienting loop 62 in this position has the advantage of using the bottom of rod 50 as a stop for further upward movement of second lateral section 82 in the indicating mode of indicator 10 as shown in fig3 a . projecting from at least a portion of first lateral section 70 was projection 90 for activating on / off switch 22 when line 60 was in sufficient tension to move loop 62 upward toward rod 50 and to oscillate projection 90 into the indicating mode of indicator 10 . one embodiment of fish indicator 10 is shown in fig2 a , 2b , 3a and 3b . in this embodiment , projection 90 was integrally molded onto first lateral section 70 of oscillating arm 64 consisting of a thermolplastic material , e . g ., polyurethane . in addition , at each end of first lateral section 70 immediately adjacent to the interior of right side 34 and left side 40 of enclosure 16 were guide projections 91 integrally molded on first lateral section 70 to serve as positioning guides within enclosure 16 . in the preferred embodiment of fish indicator 10 shown in fig4 a , 4b and 4c , projection or projecting surface 92a extends substantially along the entire length of separately injection molded thermoplastic sleeve 92b . sleeve 92b is slipped over and glued to substantially the entire width of first lateral section 93 of a steel oscillating arm 64 . in this preferred embodiment , the portions of projecting surface 92a immediately adjacent to the interior of right side 34 and left side 40 serve not only as positioning guides , but as tensioning stops for tensioning means which can simply be wing nut 94 and nylon washer 96 that are tightened onto a threaded portion of the first lateral section 93 adjacent right side 34 of enclosure 16 . in this preferred embodiment , right side 34 and left side 40 have sufficient flexibility to allow the tightening of wing nut 94 to produce variable tension on first lateral section 93 . therefore , as nut 94 is tightened against right side 34 , the tension on oscillating arm 64 is increased and the sensitivity of arm 64 to normal environmental conditions of line 60 is diminished and its ability to distinguish a fish strike from such normal conditions is increased . in addition , it has been found that it is preferred to manufacture oscillating arm 64 with different materials of construction . one piece is first lateral section 70 and longitudinal section 78 and comprises steel or an equivalent metal . the second piece is plastic sleeve 97 ( fig4 b ) having first end 97a and second end 97b placed over the end of longitudinal section 78 distal first end 72 . second lateral section 82 having loop 62 at end 80 has an right angle elbow at the other end and consists of a solid piece of plastic which is glued to first end 79a of plastic sleeve 97 . the use of plastic materials in place of steel or other metal for loop 62 provides a smoother guide to line 60 . although switch 22 electrically connected to pcb 18 was a single pole switch , catalog no . sw400 - nd manufactured by digi - key , any conventional on / off switch can be easily adapted for use with the present indicator 10 . pcb 18 was removably positioned within enclosure 16 by sliding between raised ridges or rails 98 ( fig3 a and 4a ) on the interior of right side 34 and left side 40 . pcb 18 was designed and specifically positioned within enclosure 16 so that on / off button 100 of switch 22 was immediately adjacent to projection 90 or the center portion of the edge of projecting surface 92a . this permitted button 100 to easily become engaged and disengaged during oscillations of oscillating arm 64 . an ordinary 9 volt battery 15 , e . g . a panasonic ® battery , was placed within battery compartment 12 that was designed to provide close tolerance between the outside surface of battery 15 and the inner surface of compartment 12 . conventional battery cap 104 of battery 15 was placed over negative terminal 106 and positive terminal 108 of battery 15 with the respective negative and positive lead wires 110 and 112 making the respective electrical connections to on / off switch 22 . solid speaker 20 , manufactured and sold under catalog no . p9909 - nd by digi - key , served as the audible alarm means . negative and positive lead wires 116 and 118 of speaker 20 were respectively connected to the corresponding contacts of pcb 18 . pcb 18 was also designed so that speaker 20 was within the center portion of enclosure 16 . any similar type of beeper may be used . in the preferred embodiment , led 120 within transparent housing 122 , as shown in fig2 a , 2b , 3b , and 4b , was mounted on pcb 18 with transparent housing 122 extending through opening 124 in enclosure top 28 . arm support 130 , molded as a protrusion on the exterior of left side 40 ( fig3 b and 4b ), supported oscillating arm 64 when line 60 was not under tension in the non - indicating mode . a molded flat projection along a portion of longitudinal section 78 adjacent to right angle bend 132 of oscillating arm 64 served as arm rest 134 ( fig3 a , 3b , and 3c ). a small portion of arm rest 134 contacted arm support 130 in the non - indicating mode . the tensioning means shown in fig4 a and 4b eliminates the need to have arm rest 134 attached to longitudinal section 78 . when a fish struck hook 68 and placed tension on line 60 , arm rest 134 moved upward off arm support 130 and toward rod 50 causing projection 90 to engage button 100 which activated led 120 to the on position and beeper 20 to emit variable tone from speaker 20 . the tone of speaker 20 was controlled by using 5k ohm variable resistor manufactured and sold under catalog no . k0a53 - nd by digi - key electrically connected to pcb 18 . the tone of speaker 20 was easily adjusted by means of a small screw driver placed through a hole ( not shown ) in left side 40 . fig5 illustrates another embodiment of the indicator of the present invention in which the indicator forms an integral part of the fishing rod . in this embodiment , the internals of housing 10 shown in fig2 a , 2b , 3a , 3b , 3c , 4a , 4b and 4c , e . g . pcb 18 , switch 22 , speaker 20 , battery 15 and led 120 , are operably mounted within or on hollow handle 140 of rod 50 and oscillating arm 64 extends from rod 50 as shown . it this embodiment , instead of the housing described above , the housing is cylindrical with a circular cross - section . it is apparent that the indicator may have other cross - sections from square , rectangular , octagonal and the like . fig6 is a schematic diagram of the electronic circuit for the preferred embodiment of the present invention . when sw - 1 , shown in fig2 a and 2b as on / off switch 22 , was in the on position , direct current from battery 15 through r5 activated red led diode d1 or led 120 shown in fig1 a , 2b , 3b , 4b and 5 . simultaneously , direct current through the simple oscillator , q2 , and r2 , r3 and r4 serve as an amplifier to amplify the signal from q1 and to provide the signal to solid state speaker 20 . variable resister vr1 changes the tone ( frequency ) on speaker 20 from a low pitch to a high pitched screech . a complete list of the components for the circuit shown in fig6 are set forth in table 1 below . table 1______________________________________ designa - item tion part no . description______________________________________1 c1 - c3 1103phct - nd 0 . 01 μf axial lead cap2 c4 p2036 - nd 4 . 7 μf tant filter cap3 d1 p363 - nd red led4 q1 - q2 2n4401 - nd 2n4401 npn transistor5 r2 , r5 , r7 ike - nd 1k ohms 1 / 8 watt resistor6 r1 1 . 5ke - nd 1 . 5k ohms 1 / 8 watt resistor7 r3 4 . 7ke - nd 4 . 7k ohms 1 / 8 watt resistor8 r4 10ke - nd 10k ohms 1 / 8 watt resistor9 r6 120ke - nd 120k ohms 1 / 8 watt resistor10 vr1 k0a53 - nd 5k ohm variable resistor11 speaker 20 p9909 - nd solid state speaker12 sw1 sw400 - nd single pole switch13 pj1 bs61 - nd battery connector14 pc1 pc board______________________________________ fig7 is a schematic diagram of the solder side of pcb 18 showing solder connections for the leads from the exemplary electronic circuit shown in fig6 . in the manufacture of pcb 18 , twelve individual pcb &# 39 ; s are cut from one board after the components are assembled and the approximately 40 connecting lead junctions for each pcb 18 are soldered . various embodiments of the fish indicator of the present invention have been illustrated . it is apparent that they may be easily modified by removing led 120 to result in a fish indicating beeper . alternatively , beeper 20 and the respective lead wires may be removed to result in a fish indicating light . in addition , the additional embodiments disclosed in u . s . pat . no . 5 , 396 , 726 , the pertinent portions of which are incorporated herein by reference , may be substituted for the means to attach the fish indicator to the rod and for the exact positioning of loop 62 at the end of oscillating arm 64 . without departing from the spirit and scope of this invention , one of ordinary skill in the art can make the foregoing modifications and many other changes and modifications to the indicator of the present invention to adapt it to specific usages and conditions . as such , these changes and modifications are properly , equitably , and intended to be , within the full range of equivalents of the following claims .
a fish bite indicator in combination with a fishing rod and reel is provided to give an audible and / or a visual signal when the fishing line is under sufficient state of tension . an oscillating arm of the indicator extends below the rod . the fishing line is threaded in a loop at one end of the oscillating arm below the rod in such a way to cause the arm to move upward toward the rod when the line has sufficient tension to indicate a fish strike . the other end of the oscillating arm has a projection or projecting surface that activates an on / off switch electrically connected to a battery controlled printed circuit board including means for producing the audible and / or visual signal when the line is in sufficient tension to move the loop upward toward the rod .