D.C. REVERSING SWITCH

Abstract: A reversing switch having a base with an elongated cavity (40). An insulation member (82) is provided for motion within the cavity. Conductive bridging elements (94) are provided on the ends of the insulation member. A first pair of fixed contacts (2a) is supported in the base. A second pair of fixed contacts (72a) is provided within the housing. Means (140) are provided for oscillating the insulation member between a first position wherein the bridging element at one end of the insulation member electrically connects the contact portions of the first and third fixed contacts and the bridging element at the other end of the insulation member electrically connects the contact portions of the second and fourth fixed contacts, and a second position wherein the bridging elements electrically connect the first fixed contact with the fourth fixed contact, and the second fixed contact with a third fixed contact.

Description: D.C. Reversing Switch Field of the Invention The present invention relates to electric switches, and more particularly to a crtπpact electrical reversing switch for a power tool, utensil or other motor driven device. The invention is particularly applicable to a cαπpact D.C. reversing switch for reversing the direction of rotation of an electric motor of a hand-held, cordless pcwer tool and will be described with particular reference thereto, although it will be understood that the present invention finds advantageous application in other switching operations. _Ξ_ac__ground of the ___πvention Ihe present invention relates generally to a cαπpact reversing switch of the type disclosed in U.S. Letters Patent No. 3,691,322, issued September 12, 1972 to Benjamin H. Matthews, entitled '•Reversing Switch". The patent discloses a two position reversing switdh ccπprised of a relatively stationary body segment having a plurality of stationary contacts mounted thereon and a rotary segment having a plurality of contacts mounted thereon for rotation therewith. The rotary segment is rotatable about an axis t--_rσugh the stationary body segment for moving the contact elements into several operative positions ^-herein the contacts of the rotary segment engage several of the contacts of the stationary body segment in a p-_edeterτtιined pattern to conductively bridge several of the stationary contacts. The direction of current flew t__-_rough the switch may be reversed, depending on the position on the rotary contacts with respect to the stationary contacts. A lever means is mounted on the switch housing and coacts with the rotary segment for moving the rotary contacts to one or the other of its operative positions. The disclosed switch has proved to be extremely dependable when used in reversible hand-held power tools operable on A.C. pcwer. Recent develcpments in rechargeable batteries, however, have led to a greater demand for cordless pcwer tools which are operable by rechargeable D.C. battery packs. Unlike standard A.C. current, these rechargeable D.C. battery packs operate a relatively lew voltage high current levels. In this respect, the aforementioned cαπpaσt reversing switch, and others li_κe it, were suitable foruse with high voltage/low current A.C. pcwer, simply do not have the capacity to handle the higher amperage of these new D.C. battery packs. One problem is that such switches include relatively small, delicate contact members which produce substantial resistance to current flow. For esa ple, a typical switch kncwn heretofore would e_*_hibit a resistance of over 200 milliohm thereacross. Such resistance reduces current flow, and would generate substantial heat within the switch if used with a hi -amperage D.C. pcwer source. Moreover, with high amperage, arcing between the contacts also becαnes a substantial problem for prior switches. The present irrventiαn overcomes these and other problems and provides a compact reversing switch having relatively massive electrically conductive contact members. These m___α_bers are dimensioned to conduct high current levels with minimal electrical resistance, dissipate heat frcm the switch, and provide a non x_nduσting neutral position. In addition, the switch includes relatively few parts which are easy to maπufacture and assemble. Summary of the Invention The present invention provides a novel, highly cαπpaσt reversing mechani_ * _m which finds advantageous application in the eπviixπimental setting of the aforementioned switch mechanism of U.S. Patent No. 3,691,322, as well as in low voltage high amperage env_i_rco___9ntal settings for acccfl_pl_i_shing reversal of a motor drive. In accordance with the present invention, there is provided an electric reversing switch ccπprising an insulated base having an elongated cavity defined therein. An elongated insulation meπtoer is provided for oscillatory motion about an axis t_hrough the cavity t_h__ * cugh an angular interval between a first and second position. Conductive bridging elements are provided on the ends of the insulation πeπber and biased outwardly from the insulation member along the longitudinal axis thereof. A first pair of contacts ocrtprising first and .second fixed contacts is supported in the base, each of the fixed cxartacts including a contact portion within the cavity vffiich is symmetrically disposed relative to the axis through the cavity. A second pair ccπprising t_hird and fourth fixed contacts is provided within the housing, and each of these fixed contacts includes two contact portions within the cavity wherein one contact portion is adjacent and spaced angularly from the contact portion of the first fixed contact and the other contact portion is adjacent and spaced angularly from the σoπtact portion of the second fixed contact. Means are provided for oscillatJLng the insulation iiiember between a first position wherein the bridging element at one end of the insulation member electrically connects the contact portions of the first and third fixed contacts and the bridging element at the other end of the insulation member electrically connects the cαπtact portions of the second and fourth fixed oαπtacts, and a second position vΛierein the bridging elements electrically connect the first fixed contact with the fourth fixed contact, and the second fixed contact with a third fixed contact. In acxordanσe with another aspect of the present invention there is provided a switch as defined above wherein the switch includes a third neutral position wherein the conductive bridging elements mounted on the ends of the insulation π_ember engage only the contact portions of the first pair of fixed contacts. In accordance with another aspect of the present invention, there is provided an electric reversing switch as defined above wherein each of the fixed contacts includes a connector portion external to the base of the switch. In accordance with another aspect of the present invention, there is provided a cccpact trigger switch assembly for controlling the operation of an electric motor, which trigger switch assembly incorporates the reversing switch defined above. In accordance with a still further aspect of the present invention, there is provided a ccπpact trigger switch assembly for c Ttrolling the operation of an electric motor. The trigger switch assembly includes an insulated housing having motor speed control switch means therein. A trigger assembly is connected to the motor speed control switch means and a reversing switch is provided within the housing for reversing the direction of operation of the electric motor. An elongated lever is connected to the reversing switch to control the position thereof. The lever is formed to include a pivot pin integral therewith, which pin is received in the housing in snap-lock fashion, wherein the lever pivots about the axis of the pin to cxsrfcrol the position of the reversing switch. It is an object of the present iιτver_tiσn to provide a cccpact, electrical reversing switch for vise with an electric motor for reversing the direction thereof. Another object of the present _l_πveπticn is to provide a cccpact, electrical e eling switch of the type described above wherein such switch is readily adapted for mounting on the body of a t_rigger-actuated switch, the latter being of the type integrated within the housing of a portable electric tool. Another object of the present invention is to provide a compact, electrical reversing switch of the type described above which is suitable for use in hand-held, cordless power tools using lew voltagehigh amperage rechargeable batteries. A fiarther object of the present invention is to provide a compact, electrical reversing switch as described above which has a non-conducting neutral position wherein current does not pass t_hereth_xugh. A further object of the present invention is to provide a compact, electrical reversing switch as described above which reduces power loss t_h_t-cugh the switch by reducing the electrical resistance thereacross. A still further object of the present invention is to provide a cc pact, electrical reversing switch of the type described above wherein such switch includes six contact members defined by pairs, the contacts of each pair being identical. A still further object of the present invention is to provide a cccpact, electrical reversing switch of the type described above wherein the contact members are adapted to dissipate heat from the switch. A still further object of the present invention is to provide a cccpact, electrical reversing switch of the type described above which may be readily integrated with a speed control circuit for an electric motor of a power tool. A still ftirther object of the present invention is to provide a cccpact, electrical reversing switch of the type described above which switch includes relatively few parts which are easy to manufacture and assemble. These and other objects and advantages will become apparent from the following description of a preferred ecibodiment of the invention taken together with the aαxopar_yir_g drawings. Drawings The invention might take physical form in certain parts and arrangement of parts, an en±xdi___ent of which is described in detail in the specification and illustrated in the accoopaπying drawings wherein; FIG. 1 is a top, plan view of a trigger switch assembly illustrating a preferred ej_-_-_χ_d______πt of the present invention; FIG. 2 is a side, elevaticnal view of the trigger switch assembly shewn in FIG. 1; FIG. 3 is an enlarged exploded, perspective view of the reversing switch portion of the trigger switch assembly shown in FIG. 1 ϋlustrating a preferred embodiment of the present invention; FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 2; FIG. 5 is a view taken along line 5-5 of FIG. 3; and FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG. Detailed Description of the Preferred Eπ-bodimeπt Referring new to the drawings wherein the showings are for the purpose of illustrating a preferred ecnbcxiiment of the invention, and not for the purpose of limiting same, FIGS. 1 and 2 illustrate a trigger switch assembly 10 for use in a pcwer tool. The tool may be of a portable type which includes a depending pistol, grip-like handle 12 having trigger switch assembly 10 mounted thereon, which switch 10 is adapted to control operation of an electric motor (not shown) , such as, for instance, a universal electric motor within the tool. A trigger 14 of the reciprocal spring loaded type is preferably provided to coact with a speed σαntrol switch unit 16 provided to control the speed of the electric motor in a conventionally known manner. Trigger switch assembly 10 may also include a locking mechanism (not shewn) includi g a reciprocal pin for locking trigger 14 in its full inward or ττ_-_xi,_τ_αm ■ On" position. Speed control switch unit 16 is of kncwn txnstruction for varying the speed of an electric motor in accordance with the inward movement of the trigger 14 frcm a ccopletely outward or "off" position to a cαπpletely inward or "on" position. Speed control switch unit 16 in and of itself forms no part of the present invention, and therefore will not be described in great detail. It will be understood, however, that in the es__xx___ι_eπt shown, trigger switch assembly 10 includes trigger 14, speed control switch unit 16 and a reversing switch mechanism 18 with which the present invention is particularly concerned, with such trigger switch asseπibly 10 being of integral, cccpact cx__nstructiαn for ready installation in a tool, appliance or the like. Electrical leads 20 may extend from the trigger switch assembly 10 and form part of an electrical power circuit in a conventional manner. Reversing switch mechanjs 18 includes a housing 22 formed of any suitable r_o_-_*-*α_-_-_du__-tive material, such as, for instance, moldable plastic material. In the e_____od_u__eπt shewn, housing 22 is secured, molded or otherwise formed integrally to a casing 23 enclosing speed control switch unit 16 and the remainder of trigger switch assembly 10. A partition wall 24 (best seen in FIG. 3) forms the bottcm of housing 22 and generally separates speed coaτtrol switch unit 16 from reversing switch mechanism 18. Referring new to FIG. 3, housing 22 is generally rectangular in shape and includes end wall sections 26, 28, end side wall sections 30a, 30b, 32a and 32b. End wall section 28 includes a laterally extending generally cylindrical platform 34 having a cylindrical opening 35 t-__e__et_-_rcu . Opening portion includes an upper section 35a and a lcwer section 35b of substantially smaller diameter, as best seen in FIG. 6. Side wall sections 30a, 30b and 32a, 32b define gaps or openings 36, 38 respectively, which gaps 36, 38 have a predetermined width and OMtiiimicate an interior cavity 40 which is defined by the respective wall sections with the exterior of hσusi_ng 26. Inwardly extending locating ribs 42 are provided on end wall sections 26, 28, and locating ribs 44 are provided on side wall sections 30a, 30b, 32a and 32b. Side wall members 3QA, 30B, 32A and 32B also include spacer ribs 46 thereon. Narrow throat portions or passages 48, 50 are defined between end wall sections 26, 28 and side wall sections 30a and 32a. Referring new to partition wall 24, a centrally located bearing opening 52 best seen in FIG. 5 is provided t__-e__eth_cough. Bearing opening 52 is aligned along an axis designated X through housing 22. Bearing opening 52 includes a laterally extending recess 54 having angularly spaced straight side walls 56a and 56b. Recess side walls 56a and 56b are oriented at a predete__mined angle relative to the longitaidinλl, axis of housing 22. In the preferred embodiinent, recess side walls 56a and 56b each define a 13 1/2° angle relative to the longitudinal axis of housing 22. On each side of bearing opening 52, a post 58 is provided. Posts 58 are symmetrically disposed relative to axis X and are spaced at predetermined distance from openings or gaps 36, 38. Reversing switch mechanism 18.Includes two pairs of relatively fixed or stationary contacts, the contacts of each pair being substantially identical to each cither. One pair is cccprised of fixed contacts 60, which are located adjacent end wall sections 26, 28. As best seen in FIG. 3, fixed contact 60 are generally L-shaped having a major leg 62 having a dentation 62a therein forming a contact portion, and a minor leg 64 having a notched end 64a fonning a connector portion. Connector portion 64 is a preferably dimensioned to receive a standard quick connect fastener. Connector portion 64 however may also include an aperture 65 t_heretl-_rσugh to facilitate a fastening screw (not shewn) by which a bare lead wire can be secured to the contact 60. In this respect, aperture 65 may include screw threads therein or be dimensioned to accept a self-taping screw. Fixed contacts 60 are positioned within housing 22 such that respective in dentations or contact portions 62a are syrαmetrically disposed relative to axis X as seen in FIG. 4. egs 62a of respective contacts 60 extend t_h__ough throat portions 48, 50 of housing 22 such that leg 64 and the connector portions 64a are disposed externally of housing 22. The spacing defined between end wall sections 26, 28 and side wall sections 30a, 30b and 32a,32b are dimensioned to snugly receive contacts 60 therein and to maintain contacts 60 stationary relative to housing 22. The second pair of fixed contacts is cccprised of σαπtaσts 70 which are located adjacent side wall sections 30a, 30b, 32a and 32b. As seen in FIG. 3, fixed contacts 70 are generally T-shaped having an upper leg 72 and a lower leg 74 perpendicular thereto. The ends of upper leg 72 are crimped or curved to form contact portions 72a, 72b. As best seen in the lower right hand corner of FIG. 3, lcwer leg portion 74 is off-set frσm upper leg portion 72. Icwer leg portion 74 defines the connector portion of contact 70. Fixed contacts 70 are positioned within housing 22 as best seen in IG, 4, wherein upper leg 72 is received within the opening defined between post 58 and spacer ribs 46 on wall sections 30a, 30b, 32a and 32b. m this respect, lower leg portion 74 extends 1_hrcugh gaps 36, 38 inside wall sections 30a, 30b, 32a and 32b to position lcwer leg portion 74 outside of housing 22. In this orientation, contact portions 72a and 72b are angularly disposed relative to contact portions 62a of fixed contacts 60. lower leg portion 74 preferably includes an aperture 75 therethrough, which aperture 75 is preferably threaded to receive a fastening screw 77 shewn in FIG. 2. Fastening screw 77 may be used to secure a lead 20 as shewn in FIG. 2 or may be used to secure the bare end of a lead wire. In the em_x_diment shewn, a U-shaped recess 78 (best seen in FIG. 3) is provided in casing 23 to facilitate fastener 77 extending through leg portion 74 of contact 70. External ribs 79 are provided alongside recess 78 to position leg portion 74. A rotary switch member 80 is dimensioned to be positioned within cavity 40 and to be in operative engagement with fixed contact members 60, 70. Rotary switch ι____a_±»er 80 includes a generally obround insulation element 82 (the term cibround meaning that element 82 has generally planar sides and rounded ends) . Insulation element 82 includes an upper cylindrical pivot 84, a lower cylindrical pivot 86 (best seen in FIG. 5) and a shaft 88 extending along an axis centrally disposed relative to the ends of element 82 and coaxial with axis X. The lcwer or bottom cylindrical pivot 86 includes a generally rectangular arm 86a extending to one side thereof, cylindrical pivot 86 and arm 86a are dimensioned to be received in bearing opening 52 and bearing opening recess 54 as shewn in FIG. 5, wherein the size of cylindrical pivot 86 has been slightly reduced to more clearly .illustrate the respective parts. Arm 86a and recess 54 are dimensioned and operable to limit angular rotation of insulation element 82 about axis X. In this respect, insulation element 82 can move only between the positions shewn in FIG. 4. Aligned bores 90 extend along the longitudinal axis of obround insulation member 82. Each bore 90 receives a coiled cσmpression spring 92. Generally U-shaped bridging contact members 94 are provided at the ends of insulation element 82. Bridging members 94 are formed of a metallic conductive material. A divider wall 96 is provided on each side of conductive element 82 to ensure that the ends of bridging contact members 94 do not come in contact with each other. Upper and lower flanges 82a and 82b are provided on insulation element 82 to confine vertically U-shaped bridging members 94. __ongitt_κ_lir_al ribs 99 are provided along the sides of insulation element 82. A generally planar cover 100 is provided to enclose cavity 40. Cover 100 includes a cylindrical bearing opening 102 to receive upper cylindrical pivot 84 of insulation member 82. Three depressions 104a, 104b, 104c which are angularly spaced from each other relative to bearing opening 102 are provided on the upper surface of cover 100. Cover 100 includes a pair of downward extending side walls 106 dimensioned to be received within the openings or gaps 36, 38 of housing 22. The lcwer ends 106a are dimensioned to overlie lower leg portion 74 of fixed contacts 70 when the fixed contact 70 are positioned within housing 22. located at the corners of cover 100 are tabs 108 having an opening 110 therethrough. Tabs 108 are positioned in registry with ledges or ramps 112 provided on the corners of housing 22, which ledges 112 snap respectively into openings 110 of tabs 108 when cover 100 is mcuπted on housing 22. In this respect, when cover 100 is snapped-locked onto housing 22, fixed cxiπtacts 60 and 70 are "locked" into position within housing 22, and rotary element 80 is aligned along axis X with tapper cylindrical pivot 84 engaging bearing opening 102 of cover 100, and lower or bottom cylindrical pivot 86 engaging bearing opening 52 in partition wall 24. Reversing switch mechanism 18 includes a link member 120 having a generally planar base 121 with a centrally located boss 122 thereon. Boss 122 includes an opening 124 which is configured to matingly engage, in press-fit fashion, shaft 88 of insulation element 82 to rotate with sane about axis X. Link member 120 also includes a second boss 126 located at one end of base 121. Boss 126 includes a cylindrical bore (not shewn) extending frcm the lcwer or bottom surface of base 121 to receive a coiled compression spring 128 therein. The bore and coiled compression spring 128 are adapted to be in registry with depressions 104a, 104b, and 104c to bias a spherical me__ber 130 into a selected one of the depressions based on the angular position of link 120 relative to axis X.- .A cylindrical pin 132 is provided on the other end of base 121. Embracing pin 132 of link member 120 is the end of an elongated actuating or operating lever 140 which is pivσtable about an axis Y t____rcugh platform 34 on end wall section 28, which axis Y extends generally parallel to axis X. In this respect, the underside of ac_rf_-uating lever 140 is provided with a pivot pin 142 preferably integrally formed therewith. Pivot pin 142 (best seen in FIG. 6) includes an enlarged cylindrical bearing section 144 at its juncture with lever 140 and a flared end portion 146. Pivot pin 142 is received within opening 35 in platform 34 in snap lock fashion as seen in FIG. 6 wherein pin section 144 is disposed in opening 35a. One end of actuating lever 140 includes a slot 148 for receiving the afores_-___πticned cylindrical pin 132 of link 120. The other end of operating lever 140 is provided with a tab portion 150 for convenient movement of operating lever 140 about axis Y by operation of a finger. Hi this respect, rotation of operating lever 140 about pivot pin 142 is operative to rotate link 120 about axis X. The lcwer surface of operating lever 140 includes a downward extending projection 152, best seen in FIGS. 1 and 2. Projection 152 is operative to engage a wall member 154 on trigger 14 when operating lever 140 is aligned with the longitudinal axis of the switch assembly. 3_n other words, when operating lever 140 is rotated to one side of wall member 154, trigger 14 is permitted to travel from its full "off" position to its full "on" position. When operating lever 140 is positioned in its central position, projection 152 engages wall ι_-ember 154 of trigger 14 and prevents activation thereof. Referring now to the operation of the reversing switch mechanism 18, FIG. 1 illiαstrates operating lever 140 in an electrically ∞r_ducting position. __n this position, link 120 is oriented such that spherical member 130 is positioned in depression 104c. The co__τespαndi_ng position of insulation element 82 is shown in FIG. 4. In this respect, U-shaped bridging contact members 94 connect contact portions 62a of fixed contacts 60 with contact portions 72g of fixed contacts 70. As can be seen frcm the drawings, the longitudinal axis of insulation member 82 is positioned to one side of contact portion 62a (as indicated by the axially aligned compression springs 92) . As a result, coiled cccpression springs 92 urge U-shaped bridging contact __e__ribers 94 into positive engagement with the contact portions of the respective fixed contacts. Arm 86a on lower cylindrical pivot 86 limits movement of insulation element 82 to that shewn in FIG. 4. Movement of operating lever 140 to the other side of trigger 14 causes link 120 to pivot rotary switch member 80 frcm the position shown in FIG. 4 to the position shown in phantom in the same figure. In this position, U-shaped bridging members 94 engage contact portion 62a of fixed contact 60 and contact portion 72a of fixed contacts 70, wherein the plurality of the switch has been reversed by contact of the U-shaped bridging contact inembers 94 with contact portions 62a if fixed contacts 60 and contact portions 72a of fixed contacts 70. A central, neutral position is also illustrated in phantom in FIG. 4. In this position, U-shaped conductive bridging meπbers 94 engage only contact portion 62a of fixed contacts 60. This position is assumed when lever arm 140 is aligned relative to the direction of movement of trigger 14. Importantly, in this position, projection 152 restricts ιt__vemeπt of trigger 14 to the full "on" position, as set forth above. The present invention thus provides an extremely cccpact, three- position reversing switch which includes relatively few parts and yet is cperable with high current/lew voltage batteries. __α ortantly in this respect, the conductive iαembers of the switch arrangement, i.e. contacts 60, 70 and U-shaped bridging contact members 94 are formed from relatively thick copper strips. In the etibodimeπt shown, contacts 60, 70 and 94 are preferably die stamped frcm copper sheet and have a width of approximately 5/16 inch. In this respect, fixed contacts 60, 70 and U- shaped bridging contact xoember 94 provide a cross sectional area of square inches. This relatively large cross sectional area provides substantially increased current capacity than -switches known heretofore. For instance, the cross sectional area of a contact in the reversing switch disclosed in afo__ementioned U.S. Letters Patent No. 3,691,322, is approximately square inches. As is apparent, a switch according to the present invention provides substantially more cross sectional area, which increases current conducting capacity and reduced resistance and heat. Moreover, the relatively massive contact elements of the present invention provide a convenient heat sink to remove heat generated within the switch housing. In this respect, fixed contacts 60 and 70 each include a portion external of housing 22, i.e. legs 64 and 74 respectively. These external portions act as a heat sink to conduct heat, generated within the switch due to resistance and arcing between respective contact portions, to the external areas of the switch housing. Also important air spaces or gaps are defined around fixed contact members 60 and 70. Spacer ribs 46 on side walls 30a, 30b, 32a and 32b, as well as ribs 98 on insulation element 82, produce air spaces su_crσunding the contact elements, which spaces reduce heat transfer to the housing 22 and likewise assist in dissipating heat frcm cavity 40. Accordingly, the present invention provides contact π_ea__bers which produce substantially increased current conduction, and at the same time act as heat sinks for dissipating heat frcm within the switch. The iπveπticxn also provides a reversing switch of the aforedescribed type which can be used in cxxnjunction with a trigger assembly for conveniently reversing the direction of motor movement in α-_njunction with act_uation of the trigger for controlling the electric motor, m this respect, another important aspect of the present invention is forming pivot pin 142 as an integral part of operating lever 140 and connecting operating lever 140 to housing 22 by means of a snap-lock connection. Iferεtofore metallic rivets or pins have been used to secure the operating lever to the switch housing. The present modification thus provides a simpler and less expensive fabrication and assembly of the switch unit. The present invention has been described with respect to a preferred e_j_bod__me_nt. Modifications and alterations will occur to others upon their reading and unde__-sta_-_dir_g of the . s pecification. It is intended that all such modifications and alterations be included insofar as they come wit_hin the scope of the patent as claimed or the equivalents thereof.

Claims: Having thus described the _uτeπtiαn, the following is claim*-*.; 1. An electric reversing switch ccπprising: an insulated housing including upper and lcwer sections having a cavity defined therein; an elongated insulation member oscillatory about an axis thrcu said cavity; conductive bridging elements mounted on the ends of said insulation member; a first pair of contacts coπprising first and second fixed contacts supported in said housing adjacent opposite ends thereof, each of said first and second fixed contacts including a connector portion external to said housing and a contact portion within said cavity symmetrically disposed relative to said axis tjircugh said cavity; a second pair of contacts ccarprising third and fourth fixed contacts supported in said housing, each of said third and fourth fixed contacts including a connector portion external to said housing and contact portions within said cavity wherein one contacting portion is adjacent and spaced angularly from said contact portion of said first fixed contact and another contact portion is adjacent and -spaced angularly frcm said contacting portion of said second fixed contact; and means for oscillating said insulation member between a first position wherein the bridging element at one end of the insulation Biember electrically connects the contact portions of said first and third fixed contacts and the bridging element at the other end of said insulation roember electrically connects the contact portions of said second and fourth fixed contacts, and a second position wherein said bridging elements electrically connect said first fixed contact with said fourth fixed contact and said second fixed contact with said t_hird fixed contact. 2. A switch as defined in claim 1 wherein said means for oscillating includes a third position wherein said U-shaped lrøriber engages said first and second fixed contacts. 3. A switch as defined in claim 1 wherein said lcwer section of said housing includes means for positioning said fixed contact relative to said oscillatory insulation member. 4. A switch as defined in claim 1 wherein said upper housing section includes means for locking said fixed contacts in position within said lower housing section. 5. A switch as defined in claim 1 wherein said U-shaped bridging elements have substantially equal dimensions. 6. A switch as defined in claim 1 wherein said first and second contacts have substantially equal dimensions. 7. A switch as defined in claim 1 wherein said third and fourth fixed contacts have substantially equal dimensions. 8. A switch as defined in claim 1 wherein said connector portions of said fixed contacts comprise quick connect terminals. 9. A switch as defined in claim 1 wherein said bridging elements are generally U-shaped and biased outwardly from said insulation member along the axis thereof. 10. An electric reversing switch cccprising: an insulated base having an elongated cavity defined therein, an elongated insulation member oscillatory about an axis t_hrαugh said cavity throug an angular interval between a first and second position; generally U-shaped conductive bridging elements mounted on the ends of said insulation member and biased outwardly from said insulation member along the axis thereof; a first pair of fixed contacts supported in said base adjacent opposite ends, each including a contact portion wit_hin said cavity in engagement with one of said bridging elements; a second pair of fixed contacts cccprising third and fourth fixed contacts supported in said base, each of said third and fourth fixed contacts including a contact portion within said cavity adjacent and spaced angularly from said contact portion of said first fixed contact and a contact portion within said cavity adjacent and spaced angularly from said contact portion of said second fixed contact; and means for oscillating said insulation member th_cαuc£ι said angular interval from said first position wherein one bridging element engages the contact portion of said first and third fixed contacts and the other bridging element engages the contact portion of said second and fourth fixed contacts, to said second position wherein said one bridging element engages said contact portions of said first and fourth fixed contact and said other bridging element engages said contact portions of said second and third fixed contacts. 11. A switch as defined in claim 10 wherein said means for oscillating includes a third position wherein said U-shaped member engages said first and second fixed contact. 12. A switch as defined in claim 10 wherein said fixed contacts include connecting portions external of said base. 13. A switch as defined in claim 10 wherein said lcwer section of said housing includes means for positioning said fixed contact relative to said oscillatory insulation member. 14. A switch as defined in claim 10 wherein said U-shaped bridging elements have substantially equal dimensions. 15. A switch as defined in claim 10 wherein said first and second contacts have substantially equal dimensions. 16. A switch as defined in claim 10 wherein said third and fourth fixed contacts have substantially equal dimensions. 17. A cccpact trigger switch assembly for controlling the operation of an electric motor cccprising: an insulated housing; motor speed ccartrol switch means wit_hin said housing; trigger assembly means rønnected to said motor speed control switch means for controlling the operation of said electric motor, said trigger assembly means including a trigger which is spring biassed between a first position extending outwardly from said housing and a second position nearer said housing; and a t_hree--position reversing switch within said housing for reversing the direction of operation of said electric motor, one of said three positions being an electrically nα-_-cσ_-_ducti_t * _g position. 18. A trigger switch as defined in claim 17 further cccprising lever means connected to said reversing switch for <_xErt_rollir_g the position thereof. 19. A trigger switch as defined in claim 18 wherein said lever means include means engaging movement thereof when said reversing switch is in said electrically rton-ccnducting position. 20. A trigger switch as defined in claim 18 vherein said lever means is connected to said housing in snap-lock fashion. 21. A trigger switch as defined in claim 17 wherein said reversing switch includes: an elongated insulation ___ember oscillatory about an axis through said housing; conductive bridging elements mounted on the ends of said insulation marfaer; a first pair of contacts cccprising first and second fixed contacts supported in said housing adjacent opposite ends thereof, each of said first and second fixed contacts inclu ing a connector portion external to said housing and a contact portion within said housing symmetrically disposed relative to said axis; a second pair of contacts cccprising third and fourth fixed contacts supported in said housing, each of said third and fourth fixed contacts j__-_cluding a connector portion external to said housing and contact portions within said housing wherein one contacting portion is adjacent and spaced angularly frcm said contact portion of said first fixed contact and another contact portion is adjacent and spaced angularly from said contacting portion of said second fixed contact; and means for oscillating said insulation.lrømber between a first position wherein the bridging element at one end of the insulation member electrically connects the contact portions of said first and third fixed contacts and the bridging element at the other end of said insulation ii-ember electrically connects the contact portions of said second and fourth fixed contacts, and a second position wherein said bridging elements electrically connect said first fixed contact with said fourth fixed contact and said second fixed contact with said third fixed contact. 22. A switch as defined in claim 22 wherein said U-shaped members engage only said first and second fixed contact when said switch is in said electrically non-conducting position. 23. A cccpact trigger switch assembly for controlling the operation of an electric motor cccprising: an insulated housing; motor speed control switch means within said housing; trigger assembly means connected to said motor speed control switch means for controlling the operation of said electric motor; a reversing switch within said housing for reversing the direction of operation of said electric motor; and an elongated lever connected to said reversing switch for cxsntrolling the position thereof, said lever formed to include a pivot pin integral t_herewith, said pivot pin received in said housing in snap-lock fashion.

Inventors: BITTEL ROBERT WALTER, BITTEL, ROBERT, WALTER
Applicants: LUCERNE PRODUCTS INC, LUCERNE PRODUCTS, INC.
Application year: 1989
Main classification: H01H19
IPC codes: H01H9, H01H21