|Publication number||US3850490 A|
|Publication date||26 Nov 1974|
|Filing date||25 Oct 1973|
|Priority date||25 Oct 1973|
|Publication number||US 3850490 A, US 3850490A, US-A-3850490, US3850490 A, US3850490A|
|Original Assignee||Protectoseal Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (6), Referenced by (67), Classifications (9)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Unite Sttes atent 1191 Zehr 1'Nov.. 26, 1974 [5 1 GROUNDING CLAMPlNG LEVER 3,641,473 2/1972 Attaway 339 14 R x ,737,832 6 1973 A d c 339 261  Inventor: William 1. Zehr, Des Pla1nes,Ill. 3 I
 Assignee: The Protectoseal Company, Primary Examiner-Ry D. Frazier Benseflville, Assistant ExaminerRobert A. Hafer v  Filed. Oct 25 1973 Attorney, Agent, or FirmWilliam A. Snow; Charles W. Rummler  App]. No.: 409,439
 ABSTRACT  US. Cl. 339/14 R, 339/255 P, 339/261, A Spring loaded clamp having handle members each 24/253 l 5 1 l Int Cl H0 3/06 with integrally formed cooperating jaw members, each 58] Fieid 260 26] provided with an angularly positioned, hardened steel, 339/266, pointed pin adjustable anchored in the ends of the jaws with the pin points extending inwardly and abut- 56] R i Cited ting each other. The two handles and jaws are identie emmes cal castings to cut down costs of manufacture. Each UNITED STATES PATENTS handle member is provided with inwardly extending 2.714.198 7/1935 Schloetzer 339/14 L ears pivotedly anchored together and provided with 21, 1766500 10/]956 Chanko 24/253 trong torsion pring 3,183,469 5/1965 Trachtenberg 339/255 P 3.470.523 9/1969 Milo 339/14 R 2 Claims, 5 Drawing Figures 6 2 11 28 m v \J, I 24 /2 GROUNDING CLIING LEVER BACKGROUND OF THE INVENTION When transferring flammable liquids from one container to another, it is desirable and mandatory under government regulations to protect against static sparks, and possible flash fires, by providing means to drain electrical charges to ground. Clamping levers of the above general type have been provided with a pair of handle members each having a pair of spaced inwardly extending ears but one pair of ears is spaced apart wider on one of the handle members than on the other handle member to fit thereover and be pivotally secured together. Each handle member is provided with an integrally formed jaw through which an extending steel hardened pin is threaded with the points normally abutting each other and the pins lying on a common centerline and held in this position under the action of a spring.
When in use, with the jaws spread apart by compressing the handles to affix the pointed pins on a metal surface, the pins are no longer lying on a common centerline so that the pins oppose each other but rather each lies in an outwardly extending diagonal direction and hence does not provide the most effective grip on the metal surface to which the clamp is attached. Also, if the pointed ends are not aligned when clamping a metal surface, the levers tend to twist sideways and hence the spring action does not effectively, make a solid grounding clamp.
SUMMARY OF THE INVENTION A bonding and grounding clamp having a pair of identical handle elements and each having a pair of identical inwardly extending spaced ears, each of the ears provided with aligned apertures through which a pivot pin is inserted to anchor the handles together, a compression spring wound around the pivot pin with the legs thereof extending rearwardly and lying against the inner walls of the respective handle elements to retain the handle elements spread apart, the forward end of said handle elements forming a pair of jaws and each jaw having opposed, adjustable, inwardly extending pointed pins whereby, when the jaws are spread apart for anchorage to a metal surface for grounding purposes, the pointed pins will lie in an inwardly or coincidental direction and their points will, by the spring ac" tion, be forced through the metal surface and into the raw metal to effectively form a good bond and ground. This pin orientation is very effective in resisting accidental dislodging of the clamp from the container to which it is applied.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a front elevational view of a bonding and grounding clamp of the present invention on the upper end and a hand clamp on the lower end connected together by a flexible cable;
FIG. 2 is an end elevational view taken substantially along the lines 2-2 of FIG. ll;
FIG. 3 is a cross-sectional view taken on the lines 3-3 of FIG. I;
FIG. 4 is an enlarged vertical cross-sectional view through the device of FIG. I; and
FIG. 5 is a front elevational view similar to FIG. I but showing the jaws opened and clamped to a metal surface for bonding and grounding the clamp thereto.
DETAILED DESCRIPTION OF THE DRAWINGS The device of this invention has a pair of handle members or levers 10-412 each contoured and terminating at the upper end, as shown in the drawing, in onehalf of a jaw I446. Each lever contains a pair of depending ears 118-20}, 22-24. The ears ll$-2il are spaced apart the same width as the ears 22-24 so that when the levers III-I2 are positioned together, the ears I8 and 22 will abut each other and the ears 20 and 24 will also abut each other. The cars are provided with aligned apertures as for the reception of a loose rivet pivot 28. The levers are preferably produced from an alloy of zinc by die casting.
A very strong compression spring 30 is very loosely wound once around the rivet pivot 28 with the legs 32-34 thereof extending downwardly and each terminates in a substantial right angle bend 36-38 whereby the ends thereof abut, respectively, against the lower end of the elongated recess 40 in the handles III-I2, all as shown in FIG. 4.
Each jaw 11446 is provided with a threaded aperture 42 which extends diagonally dovmwardly and inwardly at about a 15 angle from the horizontal. Hardened set screws 44, each having a pointed end 46, are threaded into the respective apertures 42 until the pointed ends 46 abut approximately medially between the jaws 14-16.
' Of course, the set screws 44 may each be set further apart or closer, with respect to the inner faces of the jaws 42, depending upon the thickness of the material to which the clamp is affixed and to assure a good grounding thereof.
The two levers III-l2 and appurtenances are generally identical, thereby decreasing costs of manufacture.
Each set screw 44 is provided with a lock washer 48 and nut SID to fix the set screws when they are correctly positioned, see FIG. 4, whereby the set screws become immovable after setting.
One or both of the lower ends 52-54 of the handles III-I2 are provided with an endwise bore 56 into which the free end of the cable 58 is inserted and held therein by set screws 641).
As shown in FIG. l, a hand ground clamp 62 is anchored to the other end of the cable 58. The hand ground clamp may be secured to any metal structure forming part of a building, pipe or other metal structure which will act as an electrical ground, while the clamp of the present invention may be anchored to the rim of a drum containing flammable liquid. Thus, when the clamps are appropriately anchored as aforesaid, or vice versa, any static electricity generated during the transfer of flammable liquids will be dissipated to ground.
As especially shown in FIG. 5, because of the downwardly and inwardly pointed set screws 4, when the handle portions of levers 10-12 are pressed towards each other, the jaws will open against the pressure of the spring 34 so that the pointed ends 46 of the set screws 44 will be able to spread apart and both lie in a substantially horizontal plane to clamp to a grounded piece of metal 7th and then, as the handles are released, the strong spring 30 will cause the pointed ends 46 of the set screws to penetrate the surface of the metal through any paint or oxides and contact bare metal t effect a good ground.
It is to be understood that numerous parts of the invention may be altered or omitted without departing from the spirit of the invention as defined by the following claims.
1. A grounding clamp of the class described comprising a pair of identical handle members, each handle member having a jaw member on one end and a pair of laterally and inwardly extending ears, the distance between each pair of ears being identical, one pair of said ears arranged to overlap the other pair of ears, said pairs of ears having aligned apertures, means pivotally securing said ears together, each of said handles having an elongated cut-out, a helical compression spring wound around said means interiorally of said ears and having the ends of said spring extending rearwardly in said cut-outs, the ends of said spring being bent substantially at right angles laterally outwardly with the terminal ends of said spring abutting against the inner surface of said handle, said jaw bored and threaded downwardly and inwardly toward said pairs of ears receiving an elongated case-hardened set screw, the inward ends of said set screws being pointed and the points abutting each other when in place in said jaws, the individual centerlines of said set screws intersecting at an acute angle, whereby when said handles are compressed towards each other the set screws will tend to approach a common center line.
2. The device of claim 1 wherein the set screws are positioned in said jaws, when said device is inoperative, so that the individual center lines intersect midway between the jaws with an angle of about 15 between them and means on said set screws to prevent displacement thereof after setting.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2714198 *||17 May 1954||26 Jul 1955||Harry F Schloetzer||Ground connector for electric welding|
|US2766500 *||5 Apr 1952||16 Oct 1956||Chanko Mortimer L||Spectacle suspender clamp|
|US3183469 *||31 Dec 1962||11 May 1965||Burndy Corp||Disconnecting clamp|
|US3470523 *||14 Feb 1968||30 Sep 1969||Milo August||Grounding clamp with automatic disconnect|
|US3641473 *||28 May 1970||8 Feb 1972||Thomas J Attaway||Vehicle-grounding clamp|
|US3737832 *||27 Sep 1971||5 Jun 1973||Anderson G||Electrical clamp|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4012097 *||17 Oct 1975||15 Mar 1977||Everett/Charles, Inc.||Combined test clip and component extraction tool|
|US4243285 *||26 Dec 1978||6 Jan 1981||Raytheon Company||Clamp-plug type connector|
|US5209679 *||15 May 1992||11 May 1993||Graphic Controls Corporation||Adaptive medical electrode connector with male stud|
|US5573426 *||28 Mar 1995||12 Nov 1996||Grant; George E.||Covered automotive jumper cables|
|US6877996||14 Apr 2003||12 Apr 2005||Senior Industries, Inc.||Grounding connector|
|US7425833||12 Sep 2006||16 Sep 2008||Midtronics, Inc.||Broad-band low-inductance cables for making Kelvin connections to electrochemical cells and batteries|
|US7557586||19 May 2003||7 Jul 2009||Midtronics, Inc.||Electronic battery tester|
|US7598699 *||20 Feb 2004||6 Oct 2009||Midtronics, Inc.||Replaceable clamp for electronic battery tester|
|US7598743||22 Feb 2005||6 Oct 2009||Midtronics, Inc.||Battery maintenance device having databus connection|
|US7619417||14 Dec 2006||17 Nov 2009||Midtronics, Inc.||Battery monitoring system|
|US7642787||24 Oct 2006||5 Jan 2010||Midtronics Inc.||Automotive vehicle electrical system diagnostic device|
|US7656162||22 Jul 2004||2 Feb 2010||Midtronics Inc.||Electronic battery tester with vehicle type input|
|US7688074||14 Jun 2004||30 Mar 2010||Midtronics, Inc.||Energy management system for automotive vehicle|
|US7706991||11 Jun 2007||27 Apr 2010||Midtronics, Inc.||Alternator tester|
|US7710119||14 Dec 2005||4 May 2010||Midtronics, Inc.||Battery tester that calculates its own reference values|
|US7728597||3 Nov 2008||1 Jun 2010||Midtronics, Inc.||Electronic battery tester with databus|
|US7772850||11 Jul 2005||10 Aug 2010||Midtronics, Inc.||Wireless battery tester with information encryption means|
|US7777612||3 Aug 2006||17 Aug 2010||Midtronics, Inc.||Theft prevention device for automotive vehicle service centers|
|US7791348||27 Feb 2007||7 Sep 2010||Midtronics, Inc.||Battery tester with promotion feature to promote use of the battery tester by providing the user with codes having redeemable value|
|US7808375||9 Apr 2008||5 Oct 2010||Midtronics, Inc.||Battery run down indicator|
|US7924015||6 May 2010||12 Apr 2011||Midtronics, Inc.||Automotive vehicle battery test system|
|US7940052||2 Feb 2010||10 May 2011||Midtronics, Inc.||Electronic battery test based upon battery requirements|
|US7940053||25 May 2010||10 May 2011||Midtronics, Inc.||Battery tester with promotion feature|
|US7977914||31 Oct 2007||12 Jul 2011||Midtronics, Inc.||Battery maintenance tool with probe light|
|US7999505||5 Oct 2004||16 Aug 2011||Midtronics, Inc.||In-vehicle battery monitor|
|US8164343||30 Oct 2008||24 Apr 2012||Midtronics, Inc.||Method and apparatus for measuring a parameter of a vehicle electrical system|
|US8198900||2 Mar 2004||12 Jun 2012||Midtronics, Inc.||Automotive battery charging system tester|
|US8203345||4 Dec 2008||19 Jun 2012||Midtronics, Inc.||Storage battery and battery tester|
|US8237448||7 Jul 2008||7 Aug 2012||Midtronics, Inc.||Battery testers with secondary functionality|
|US8306690||17 Jul 2008||6 Nov 2012||Midtronics, Inc.||Battery tester for electric vehicle|
|US8344685||1 Apr 2009||1 Jan 2013||Midtronics, Inc.||System for automatically gathering battery information|
|US8436619||1 Apr 2009||7 May 2013||Midtronics, Inc.||Integrated tag reader and environment sensor|
|US8442877||1 Apr 2009||14 May 2013||Midtronics, Inc.||Simplification of inventory management|
|US8493022||22 Apr 2010||23 Jul 2013||Midtronics, Inc.||Automotive vehicle electrical system diagnostic device|
|US8513949||4 Sep 2008||20 Aug 2013||Midtronics, Inc.||Electronic battery tester or charger with databus connection|
|US8674654||9 Aug 2011||18 Mar 2014||Midtronics, Inc.||In-vehicle battery monitor|
|US8674711||19 Dec 2006||18 Mar 2014||Midtronics, Inc.||Method and apparatus for measuring a parameter of a vehicle electrical system|
|US8704483||28 Nov 2012||22 Apr 2014||Midtronics, Inc.||System for automatically gathering battery information|
|US8738309||30 Sep 2010||27 May 2014||Midtronics, Inc.||Battery pack maintenance for electric vehicles|
|US8754653||7 Jul 2009||17 Jun 2014||Midtronics, Inc.||Electronic battery tester|
|US8864638 *||17 Sep 2012||21 Oct 2014||Exemplar Design, Llc||Push-pull handles|
|US8872516||28 Feb 2011||28 Oct 2014||Midtronics, Inc.||Electronic battery tester mounted in a vehicle|
|US8872517||15 Mar 2011||28 Oct 2014||Midtronics, Inc.||Electronic battery tester with battery age input|
|US8958998||12 Apr 2010||17 Feb 2015||Midtronics, Inc.||Electronic battery tester with network communication|
|US8963550||11 Oct 2011||24 Feb 2015||Midtronics, Inc.||System for automatically gathering battery information|
|US9018958||19 Oct 2011||28 Apr 2015||Midtronics, Inc.||Method and apparatus for measuring a parameter of a vehicle electrical system|
|US9052366||6 Aug 2012||9 Jun 2015||Midtronics, Inc.||Battery testers with secondary functionality|
|US9201120||9 Aug 2011||1 Dec 2015||Midtronics, Inc.||Electronic battery tester for testing storage battery|
|US9229062||23 May 2011||5 Jan 2016||Midtronics, Inc.||Electronic storage battery diagnostic system|
|US9244100||11 Mar 2014||26 Jan 2016||Midtronics, Inc.||Current clamp with jaw closure detection|
|US9255955||2 May 2011||9 Feb 2016||Midtronics, Inc.||Method and apparatus for measuring a parameter of a vehicle electrical system|
|US9274157||23 Sep 2010||1 Mar 2016||Midtronics, Inc.||Battery tester for electric vehicle|
|US9312575||13 May 2014||12 Apr 2016||Midtronics, Inc.||Battery testing system and method|
|US9335362||5 Nov 2012||10 May 2016||Midtronics, Inc.||Battery tester for electric vehicle|
|US9419311||18 Jun 2010||16 Aug 2016||Midtronics, Inc.||Battery maintenance device with thermal buffer|
|US9425487||1 Mar 2011||23 Aug 2016||Midtronics, Inc.||Monitor for front terminal batteries|
|US9496720||24 Jan 2012||15 Nov 2016||Midtronics, Inc.||System for automatically gathering battery information|
|US9588185||25 Feb 2010||7 Mar 2017||Keith S. Champlin||Method and apparatus for detecting cell deterioration in an electrochemical cell or battery|
|US20110277279 *||17 May 2010||17 Nov 2011||Sung-Po Tsai||Clip Having Exactly Positioning Function|
|US20130072365 *||17 Sep 2012||21 Mar 2013||Exemplar Design, Llc||Push-pull handles|
|USD486791||29 Jan 2003||17 Feb 2004||Senior Industries, Inc.||Ground block|
|USD487427||29 Jan 2003||9 Mar 2004||Senior Industries, Inc.||Ground block|
|CN102280731A *||13 Jun 2011||14 Dec 2011||重庆市电力公司沙坪坝供电局||转向式接地杆|
|CN103441349A *||8 Aug 2013||11 Dec 2013||国家电网公司||Operating device for grounding wire|
|CN104253323A *||8 Aug 2013||31 Dec 2014||国家电网公司||Ground wire operation device|
|CN104253323B *||8 Aug 2013||17 Aug 2016||国家电网公司||一种接地线操作装置|
|DE3418349A1 *||17 May 1984||21 Nov 1985||Absaar Elektroapparatebau Gmbh||Contact terminal in the form of pliers, especially for a starting aid cable|
|U.S. Classification||439/92, 439/822|
|International Classification||H01R4/64, H01R11/24, H01R11/11|
|Cooperative Classification||H01R4/64, H01R11/24|
|European Classification||H01R11/24, H01R4/64|