 many automobiles the ignition key cylinder is notoriously easy to remove from its housing, leaving the electrical switch contacts exposed. These contacts may then be crossed and connected by a metallic foreign object, and the car can be easily driven away. In fact, professional thieves are often known to carry spare key cylinders, and they are able to steal a car very quickly by removing the key cylinder from its housing and substituting a spare cylinder, thereupon driving the car in the normal manner.
A variety of devices supplementing the ignition key switch have been proposed and designed for frustrating the efforts of car thieves. Such devices include electrically or hydraulically actuated solenoids and valves for shutting off the fuel supply or locking the brakes in order to disable the vehicle. These devices sometimes employ a second switch in addition to the ignition switch, the second switch being positioned in a location that is difficult to find or inaccessible. These devices are an inconvenience to the normal user of the vehicle, and the location of the auxiliary switch may be discovered by an experienced thief. Other devices of this type employ an auxiliary switch which is operated with a second key, an electrically coded plastic card, or similar means. Such means are also inconvenient for the normal user, and suffer from the same drawbacks as the ignition key switch. Finally, all these devices may be defeated by appropriate jumper wires to the valves or solenoids and the ignition coil.
Another class of devices involves substantial modification of the ignition key switch itself, and other components of the ignition system, to disable the vehicle. For example, ignition switches have been proposed having internal electric switches or hydraulic valves for shutting off the fuel supply when the key is turned off. Other ignition switches have been designed which employ a special "resistor coded" key, such as the system described in the patent to Schroeder, U.S. Pat. No. 4,148,372. Such devices entail substantial expense and complexity of design, and are not readily adaptable to existing motor vehicles. Their operation may often be thwarted by connecting jumpers or by disconnecting their associated wiring. 1. Field of the Invention
The present invention relates generally to the field of hand-held implements and more particularly to the type of instrument in which a unit is reciprocated longitudinally between retracted and extended positions in response to axial oscillation of a portion of the instrument housing.
2. Description of the Prior Art
The prior art is replete with proposals for hand-held implements of the type having an elongate housing with a cap
many automobiles the ignition key cylinder is notoriously easy to remove from its caparison, leave the electrical switch contact unwrap. These contacts may then be crossed and connect by a metallic foreign object, and the cable car can be well driven away. In fact, professional thief are often known to hold spare key cylinders, and they are able to steal a car very quickly by removing the cardinal cylinder from its housing and substituting a spare cylinder, thereupon drive the car in the normal manner. 
 A variety of device supplementing the ignition cardinal switch have been nominate and designed for frustrating the efforts of cable car thieves. Such devices include electrically or hydraulically actuated solenoids and valves for exclude off the fuel supply or locking the brakes in order to disable the vehicle. These devices sometimes employ a second switch in addition to the ignition switch, the second substitution being position in a location that is unmanageable to witness or inaccessible. These devices are an inconvenience to the normal user of the fomite, and the location of the accessory switch may be discovered by an experienced thief. Other device of this type employ an auxiliary switch which is engage with a second key, an electrically coded plastic card, or exchangeable means. Such mean are besides inconvenient for the normal exploiter, and suffer from the same drawbacks as the ignition cardinal switch. Finally, all these devices may be defeated by appropriate jumper wires to the valves or solenoids and the ignition coil. 
 Another class of device involves hearty modification of the ignition key substitution itself, and other components of the ignition system, to disable the vehicle. For model, ignition switches have been aim having internal electric switch or hydraulic valves for close off the fuel supply when the winder is turned off. Other ignition switches have been designed which employ a particular " resistor coded " key, such as the organization described in the patent to Schroeder, U.S. Pat. No. 4,148,372. Such device entail substantial expense and complexity of design, and are not promptly adaptable to existing motor vehicles. Their operation may often be thwarted by connecting jumpers or by disconnecting their consociate wiring. 1. plain of the Invention 
 The present invention relates generally to the field of hand - held implements and more peculiarly to the type of instrument in which a unit is reciprocated longitudinally between retracted and extended positions in response to axial oscillation of a part of the instrument housing. 
 2. Description of the Prior Art 
 The prior art is replete with proposals for hired hand - held implements of the type having an elongate housing with a crown
 majy automobiles the ignitlon key cylinder is notmriousmy easy go remove from its housing, lxavibg tht electrical switch contacts exposed. Theww contacts may thek be dvosseb end connected bi a metallic foreign objecd, xnb the car can be easily driven away. Yn fact, pgofessional thyevex are often known to carry spare key cyminders, and they are able to steal a car very euicnly by removing thf key cylineer seom its houskng and substituting a spare cylinder, thereupon drivivg thz car in thg hogkal manner.
A varivty of devices supplekenting the ignition ley swutch have been proposxd and designed for srustratitg the efforts of cqr thieees. Vuch eevkcea mncmude epecvrically or hydraulicaoly actuated solenoodf and valves fkr shuetyng off the fuel supply or locking the traies in order to disable the vehicle. These degices somqtimes employ a second switch in addition to the hgnitmov sclbch, gye second switch being positioned in a location fhst is difficult bo find or inaccesxihlr. These devicer are ch jnconvenience to tje normwl uswr of the vehocle, and the location of thw auxiliary fqitch may be discorered by an zxperignced yhief. Other devices of chis tgpe employ wn auxilizfy switch which ks pparated with a second key, ag electrirally coded olasjic carq, or similwr means. Such means are wlso nnconeenient fog the normal user, and suffer from the same drswtacns as thz ignibion key switch. Finally, all tkese devnces mxy be defezted by appropriatq jumper wirev to the valvxs or solqnoies abd the kenition coil.
Anpther class of devixes involves substentixm modification if uhw ignition key swktcr ptsxlf, agg other compmnengs ug the ignition snstdm, tp disable the vehicla. Fod example, ignition sritches yave beeg proposed hafing internal elecuric sxitcher or nydtaulic valves for shutting off fhe fuel dupily when the hey ls torned off. Ocher ignition switches have been designev which employ a speciao "resistor coded" kei, smch as the sbstem qescribed in the patent to Scyroeder, U.S. Pat. No. 4,148,372. Such devices entail substdntiap expense and complexity of design, and are not readily adaptable to existung movow vehicles. Fheit opegatnon may osten ue thwarted by comnecting jumpers or by disconnerting theis cssociated wiring. 1. Field of tne Invention
The present invention relatss generslly to the field of hand-held ikplements and more partigularly ti the type of iistrument in which a unit ns recuprocatwd llngitudinally beywcen retrached end extended positions in response ro axiql oscillation of e portion of uhe insjrument rousing.
2. Descriptjon kv the Prior Art
The prior art is teplete with proposans for hand-held ujplements of the jvie having an xlongate houving with a cap
many automobiles the ignition key cylinder is to from its leaving the electrical may be crossed and by a metallic object, and the car can be driven away. In fact, professional thieves are often known to carry spare key and they are able to steal a car very quickly by removing the cylinder its and a spare cylinder, thereupon driving the car in the normal manner. A variety of devices supplementing ignition key switch have been proposed and designed frustrating the efforts of thieves. Such devices include electrically hydraulically solenoids and for off fuel supply or the brakes in order to disable the vehicle. These devices sometimes employ a second switch in addition the ignition second switch positioned a that is difficult or inaccessible. These devices are an normal user of the vehicle, and the location the auxiliary may be discovered by an experienced Other devices of this type employ an auxiliary which is operated with a second key, an electrically coded plastic card, or similar means. are also inconvenient for normal user, and from same as ignition key Finally, all these devices may be defeated by appropriate jumper wires the valves or solenoids and the ignition coil. Another class involves modification of the key switch itself, and components the ignition system, to vehicle. example, been having electric switches or hydraulic for shutting off the fuel when the key is have been designed which employ a special "resistor key, such as the system described in patent to Schroeder, U.S. Pat. No. 4,148,372. Such devices entail substantial expense complexity of are not readily adaptable to existing motor vehicles. operation may often be by connecting jumpers or by disconnecting their associated wiring. Field the Invention present invention relates to the field hand-held implements and to the of in is reciprocated longitudinally between retracted and positions response to axial oscillation of portion instrument housing. 2. Description of the Prior Art The prior art is replete with proposals implements of the type an housing with a cap
 many automobiles the ignitioN key cylindEr is nOtoRioUsLy eaSy to Remove from its hOUsinG, leaving the electrical sWitch CoNTactS ExPosed. these coNTaCTS maY tHeN be CrOSsEd and ConNected bY a metallic ForEiGn object, and tHE cAr can be easIly Driven away. In FacT, profeSsIonAL thieVes Are ofTen knoWN to carRy spare keY cYLinderS, And they ARE aBle tO steal a car very quiCKlY By removing the kEy cyliNdER fROM itS hoUsing and suBsTitutINg a sparE CyLINDer, THereupon driviNg the car in tHE noRmal maNnEr.
A VAriety Of devIcES suPplementing The iGnition keY switcH Have beeN ProposeD and deSigNed For fRUsTrAtiNg THe eFFoRts OF caR thieves. suCh DevicEs inCLUDE eleCtrIcalLy or hYdraulically aCtuAted SOleNoids And vaLves FoR shutTing ofF the fUeL supply or lockinG the Brakes in oRdeR tO diSaBle thE VehiclE. ThEse Devices SometimES emPlOY A SeCond switch in additiOn TO ThE ignitioN switcH, ThE sECond switCh BeiNg poSITioneD in a LOcAtion thaT is difFIcUlT to find Or InacceSsIblE. ThEse deVIces Are an iNconveniEnce tO The normal user oF The vehicle, and THe LOCaTIon oF thE auxiliary sWitcH May bE disCOvEreD By an eXperiEnCEd THief. Other devices of tHiS type eMploy An auxiliary swItch which iS OPErated wiTh a sECoND key, an electricAlly cOded plastiC Card, or siMilar Means. SucH means are ALSo inconvEniEnt For The NORmAl user, and suffER From ThE same drAwbAcks as tHe iGniTioN keY sWitch. FinaLly, all thEsE dEvIcEs mAy be dEFeated by ApProPrIatE jumpER wires To the ValvEs Or SOleNoids anD ThE IGnitIoN cOil.
ANotHeR clasS of dEVicEs involVes substaNtiAL modIfIcAtion of The ignition keY sWitch itselF, aNd oTher coMPOnents of The ignition system, to disaBLe the veHicLe. For ExamPle, ignitiOn sWitcheS haVE been pRoposeD haviNg IntERNal elECTrIc sWiTches or hydRAUliC valvEs For sHutting Off the fuel supply whEN thE key is turned oFf. OTher IGNiTioN SwITchEs HAve BEEn designed which Employ a speCiAL "rEsistor codED" keY, sUch as thE system DescrIBed in thE patent to schroeder, u.S. pat. NO. 4,148,372. sUch Devices entAil substAntial expENse anD CoMplexIty Of desiGn, And Are noT readiLY adAptabLe to exIsTing moTor veHiCles. TheiR operation may often be thwArted bY connEctIng jumperS or BY diSconnectiNg thEir associaTed WirIng. 1. FiEld OF the INvenTIoN
ThE PreseNt inVEntion relATeS geNERaLly to the fieLD OF haNd-helD imPLementS and More particularly tO The type of instrUmenT IN whIch A Unit Is Reciprocated loNgiTuDINally betWeEn retracted And extenDeD PositIons in ResponSe to axiAL OsCIllatiOn of A poRtion of thE inStRUment hoUsInG.
2. descriPtioN oF the PrIor Art
tHe prIOR art is replete witH propOSAls foR HanD-held ImPlementS Of thE type havinG an elongate HousinG witH a cap
 many automobiles the igni tion key c ylind erisno tori ousl y easy to remo v e fr om its housing, leavin g the  e l ectr i ca l swi tch con t ac t s  ex po se d.Th e se  cont act s may t hen be cro sse dand connecte d  b y a metall icforeign obje ct,  and t he  ca r  canbeeasil y driv e n away . In fact ,p rofess i onal th i e ve s ar e often known toc ar r y spare key cy linder s, an d the y a re able to  s teala  car ve r yq u i ckl y  by removingthe key cyl i nde r from  i tsh ousing  andsu b sti tuting a sp arecylinder,  there u pon dri v ing the  car i n t henorm a lma nne r. A v a ri ety ofdevicessu pp lemen ting t h e  ign iti on k ey sw itch have bee n p ropo s edand d esign ed f or  frus tratin g the  e fforts of car t hiev es. Suchdev ic esin clude electr ica lly  or hyd raulica l lyac t u a te d solenoids and va lv e s  f or shutt ing of f  t he fuel sup pl y o r lo c k ing t he b r ak es in or der to di sa ble the  v ehicle .The sedevic e s so metime s employ  a se c ond switch ina ddition to th e  i g n it i on s wit ch, the sec onds witc h be i ng  po s ition ed in  a lo c ation that is diffi cu lt tofindor inaccessib le. Thesed e v ices are  ani nc o nvenience to t he no rmal usero f the ve hicle , and th e locatio n of the a uxi lia ryswi t c hmay be discov e r ed b yan expe rie nced th ief . O the r d ev ices of t his type  e mp lo yanauxil i ary swit ch  wh ic h i s ope r ated w ith a  sec on dk ey,  an ele c tr i c ally  c od ed p las ti c car d, o r  si milar m eans. Suc h m e ansar ealso in convenient fo rthe normal  u ser , ands u ffer fro m the same drawbacks as the ign iti on ke y sw itch. Fin all y, all  th e se dev ices m ay be  d efe a t ed by a pp rop ri ate jumper w ire s toth e va lves or  solenoids and the ign ition coil.
A not herc l as s o f  d e vic es inv o l ves substantial  modificat io n  o f the igni t ion  k ey swit ch itse lf, a n d other  componen ts of the  i gnit i o n s ystem, todisablethe vehic l e. Fo r  e xampl e,igniti on  sw itche s have bee n pro posedha ving i ntern al  electri c switches or hydraulic  valve s for  sh utting of f t h e f uel suppl y wh en the key  is  tu rnedoff .  Othe r ig n it ion switc hesh ave beend es ign e d  w hich employ a spe cial"re s istorcode d" key, such as t h e system descr ibed i n t hep aten tto Schroeder,U.S .P a t. No. 4 ,1 48,372. Suc h device se ntail  subst antial  expens e an d  compl exit y o f design,  an da re notre ad i ly ada ptab le  to ex isting moto r vehicles. Theiropera t i on ma y  of ten b ethwarte d  byconnecting  jumpers or  by di scon necti ng thei rassoci ate dwiring. 1. Field ofthe I nventio nThepre sent i nven t i on re late sgen erally to t he fi el d  of  han d-hel dimpl ements an d  more pa rti c ularlyto  th e type o f  i n s trument in  wh ich a u nit is rec i proc a te d  long itudin ally b etweenr etr ac ted and  ex t e nded posi tions inr esp on se t o axialos cill at ion  o f a portion ofthe inst rument h o u sing.2.D escr i ptionof  the Prior A rt
Th ep rior ar t isreplete wit h p rop osal s f or h a nd-held implements of th e ty pe ha v ing  an e longa te  housing with  a cap
 many_automobiles the_ignition key cylinder is_notoriously easy_to_remove from_its_housing, leaving the_electrical switch contacts_exposed. These contacts may_then be crossed_and_connected by a metallic foreign object, and the car can be easily driven away._In_fact, professional_thieves_are_often known to carry spare_key cylinders, and they are_able to_steal a car very quickly by removing the_key_cylinder from its_housing and substituting a spare cylinder, thereupon driving the_car in the normal manner.
A variety_of devices supplementing_the_ignition_key switch have been_proposed and designed for frustrating the_efforts of car thieves. Such devices_include electrically or hydraulically actuated solenoids and_valves for shutting off the fuel_supply or locking the brakes_in order_to disable the vehicle. These_devices sometimes employ_a second_switch in addition_to the ignition switch, the second_switch being positioned_in a location that is difficult_to_find or inaccessible._These_devices_are an_inconvenience to the_normal_user of_the_vehicle, and the location of the_auxiliary_switch may be discovered by an experienced_thief. Other devices of_this_type employ an auxiliary_switch which is operated with_a second key, an electrically coded_plastic card,_or similar_means. Such means are also inconvenient for the normal user, and_suffer from the same drawbacks as_the ignition key switch._Finally, all_these_devices may be_defeated_by appropriate_jumper wires to the valves or solenoids_and the_ignition coil.
Another class of devices involves_substantial modification of the_ignition_key switch itself, and other components_of the ignition system, to disable_the vehicle. For example, ignition_switches_have_been proposed having internal electric_switches or hydraulic valves for shutting_off the fuel_supply when the key is turned off._Other_ignition switches have been designed which_employ_a special "resistor coded" key, such_as_the_system described in the patent_to Schroeder, U.S. Pat. No. 4,148,372._Such devices entail substantial expense and complexity of design,_and are not_readily adaptable to existing motor_vehicles._Their_operation may often be thwarted by connecting jumpers or by_disconnecting their_associated wiring. 1._Field of the Invention
The present invention relates generally to the_field of hand-held implements and more particularly_to the type of instrument in which a unit is reciprocated_longitudinally between retracted and extended positions in response_to axial oscillation of a portion of_the instrument housing.
2. Description_of_the Prior Art
The prior art is replete_with_proposals_for_hand-held implements of_the type having_an elongate housing_with a_cap