Device for connection to a post

Abstract: A wire connecting portion 11 is formed with a fastening ring 13 which has an elliptic cross-section and is formed with a slot 16. Projections 18 are formed on the inner surface of major axis portions of the fastening ring 13. A rotatable ring 21 which has an elliptic cross-section larger than the fastening ring 13 and from which a lever 25 projects is fitted around the outer surface of the fastening ring 13 as shown in Fig. 7(A). When the fastening ring 13 is fitted around a battery post 4, the minor axis portions 14 and the projections 18 contact the outer surface of the battery post 4 as shown in Fig. 7(B). When the rotatable ring 21 is rotated clockwise by 90° by means of the lever 25, the minor axis portions 22 of the rotatable ring 21 are located outside the major axis portions 15 of the fastening ring 13, thereby pressing them inwardly. In this way, the fastening ring 13 is tightened while narrowing the spacing of the slot 16. As a result, the opposed projections 18 are pressed against the outer surface of the battery post 4, thereby securely coupling the fastening ring 13 with the battery post 4. Thus, a connection of a battery terminal with a battery post is simplified.

Description: DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for connection to a post, particularly to a battery terminal for connecting a wire with a battery terminal post projecting from a battery for use in an automotive vehicle. Such a known battery is disclosed in Japanese Unexamined Utility Model Publication No. 1-95076. One end of a wire connecting portion is connected with the wire and the other end thereof is folded back while forming a circular fastening portion. A bolt and a nut are mounted where the ends of the wire connecting portions are put together. The wire connecting portion, in a loose state where it has a larger diameter, is fitted around the battery terminal post. Then, the fastening portion is tightened by fastening the bolt and nut by use of a wrench or like tool to securely couple the wire connecting portion with the battery terminal post. However, the prior art battery terminal necessitates a cumbersome operation of rotating the bolt several times by use of the wrench when being coupled with the battery terminal post. Particularly, in recent years, there has been a tendency to compact a variety of equipments in an engine compartment of an automotive vehicle. This leads to reduced operability because of interference of the equipments with the tool. DE-U-87 03 228.7 discloses a device for connecting a cable to a battery post comprising a nut provided with a lever, which is screwed on a slitted fastening ring which is connected with the cable by a connection portion. The fastening ring having an inner tapered configuration is plugged on the battery post having a correspondingly tapered outer configuration. It is an object of the invention to provide a device which can easily be coupled with a post. The above object of the invention as to claim 1 is accomplished by a device for connection to a post comprising a connecting portion, a deformable fastening ring, a rotatable means comprising a lever, which is rotatably fittable around the outer surface of said fastening ring and formed such that the diameter of said fastening ring is made smaller by a rotation of said rotatable means with respect to said fastening ring, characterized in that the rotatable means is a rotatable ring comprising the lever, and in that a locking mechanism is arranged at the connecting portion and the lever provided for lockingly engaging the lever with the connecting portion in the position where the rotatable ring deformes the fastening ring to a smaller diameter. Preferred embodiments are given in the subclaims. Accordingly, the fastening ring is tightened by gripping and rotating the lever, thereby obviating the need for a wrench or like tool, and the fastening ring can be locked in the position where it is tightened. Thus, the loosening of the fastening ring due to rotation of the rotatable ring upon being subjected to vibrations, etc. can be prevented and connection failures resulting from the loosening of the fastening ring can securely be avoided. The wire connecting portion may preferably be formed with a fixing portion engageable with a battery main body to prevent the wire connecting portion from rotating together with the rotatable ring . This eliminates the need for an operation of hand-holding the wire connecting portion and enables a single-hand operation, thereby further simplifying the coupling operation. The invention operates as follows. After fitting the rotatable ring around the fastening ring (preferably such that the major and minor axis portions of the rotatable ring are located outside the corresponding major and minor axis portions of the fastening ring), the fastening ring is fitted around the outer surface of the post (preferably a battery terminal post). Upon rotation of the rotatable ring in this state (the minor axis portions of the rotatable ring preferably come into external contact with the major axis portions of the fastening ring), the fastening ring is pressed inwardly. As a result, the diameter of the fastening ring is made smaller, preferably while narrowing the spacing of a slot of the fastening ring. Thereby, the fastening ring, preferably the projection formed on the inner surface of the fastening ring, is pressed against the outer surface of the post, with the result that the fastening ring is immovably held around the post. As described above, according to the invention , the fastening ring is securely coupled with the post by merely rotating the rotatable ring by a small angle. Accordingly, the coupling operation can easily be performed even if there is only a small operation space because of the presence of other equipments around the post. These and other objects, features and advantages of the present invention will become more apparent upon a reading of the following detailed description and accompanying drawings in which: FIG. 1 is an exploded perspective view of a battery terminal according to one embodiment of the invention, Fig. 2 is a plan view of the entire battery terminal before the fastening, Fig. 3 is a front view of the entire battery terminal, Fig. 4 is a vertical section of the battery terminal, Fig. 5 is a plan view of the entire battery terminal after the fastening, Fig. 6 is a horizontal section showing a cross-section of a fastening ring, Fig. 7(A) is a partially enlarged plan view showing a state before the fastening, and Fig. 7(B) is a partially enlarged plan view showing a state after the fastening. Hereafter, one embodiment of the invention is described with reference to Figs. 1 to 7. In Fig. 1, a wire connecting portion 11 is formed of conductive material such as copper alloy into a long and narrow shape and is connected with an insulated wire 1 by clamping a barrel 12 formed at one longitudinal end thereof with an exposed core 2 of the wire 1. In the longitudinal center of the wire connecting portion 11, there is unitarily formed a fastening ring 13 fittable around a battery post 4 which projects from the upper surface of a battery main body 3 for use in an automotive vehicle. The battery post 4 is in the form of a cylinder which has a right circular horizontal cross-section and tapers toward the upper end. The fastening ring 13 also tapers toward the upper end so as to conform to the shape of the battery post 4. As shown in Figs. 2 and 6, a horizontal cross-section of the fastening ring 13 is an ellipse. The fastening ring 13 has minor axis portions 14 closely engageable with the outer surface of the battery post 4 and major axis portions 15 which are more distant from the center of the ellipse than the minor axis portions 14. The minor axis portions 14 are arranged along a direction normal to the longitudinal direction of the wire connecting portion 11, whereas the major axis portions 15 are arranged along the longitudinal direction of the wire connecting portion 11. A slot 16 of a constant width is formed in a specified position of one minor axis portion 14 of the fastening ring 13. The slot 16 extends from the upper end to the bottom end of the fastening ring 13. The major axis portions 15 are embossed in specified positions substantially in the center with respect to the vertical direction, such that projections 18 project inwardly from the inner surface of the major axis portions 15 as shown in Fig. 4. As shown in Fig. 6, a distance a between the projections 18 is equal to the distance between the minor axis portions 14 through the center of the ellipse (twice the minor axis of the ellipse) at the same height. Thus, when the fastening ring 13 is fitted around the battery post 4, the opposed projections 18 contact the outer surface of the battery post 4 as the minor axis portions 14 do. At the upper ends of the major axis portions 15 of the fastening ring 13, there are formed locking portions 19 for lockingly retaining a rotatable ring 21 to be described later. As shown in Fig. 1, the locking portions 19 initially project upward, but are bent as indicated by phantom line after the mounting of the rotatable ring 21. The rotatable ring 21 has an elliptic horizontal cross-section larger than the fastening ring 13 at the same height and tapers toward the upper end. The rotatable ring 21 is fitted around the fastening ring 13 such that minor axis portions 22 and major axis portions 23 thereof are located outside the corresponding minor axis portions 14 and the major axis portions 15 of the fastening ring 13. A lever 25 which is operated to rotate the rotatable ring 21 projects horizontally outward from the outer surface of one minor axis portion 22 of the rotatable ring 21, in a position a specified distance below the upper end. The opposite lateral edges of the lever 25 are folded so as to assure strength and enable an easier grip. An engaging hole 26 is formed substantially in the longitudinal center of the lever 25. At the leading end or the other longitudinal end of the wire connecting portion 11, there is unitarily formed a locking part 28 having a hook 29 in a position along a rotating path of the rotatable ring 21. The hook 29 is engageable with the engaging hole 26. Specifically, the locking part 28 extends upward from one lateral side (upper side in Fig. 2) of the wire connecting portion 11 to a position in the vicinity of the upper end of the fastening ring 13. The locking portion 28 is folded substantially at a right angle to extend horizontally to a position substantially above the lateral center of the wire connecting portion 11. At this position, the hook 29 projecting downward is formed. As shown in Fig. 4, the leading end of the wire connecting portion 11 is bent downward to form a fixing plate 30 which is fitted along the upper edge of one side surface 5 of the battery main body 3 to prevent rotation of the wire connecting portion 11. There is next described a procedure of coupling the battery terminal of this embodiment with the battery post 4. First, the rotatable ring 21 is fitted around the outer surface of the fastening ring 13 such that the major and minor axis portions 23 and 22 of the rotatable ring 21 are located outside the corresponding major and minor axis portions 15, 14 of the fastening ring 13 and the slot 16 of the fastening ring 13 is located where the lever 25 is located. In this state, the slot 16 of the fastening ring 13 is completely open. The battery terminal is coupled with the battery post 4 as follows. The fastening ring 13 is fitted around the outer surface of the battery post 4 while fitting the fixing plate 30 along the side surface 5 of the battery main body 3. Then, as shown in Fig. 7(A), the minor axis portions 14 and the projections 18 formed on the inner surface of the major axis portions 15 come into contact with the outer surface of the battery post 4 in directions normal to each other. Subsequently, the lever 25 is gripped and rotated to rotate the rotatable ring 21 clockwise by 90° in the drawings of Figs. 2 and 7(A). At this time, it is unnecessary to hand-hold the wire connecting portion 11 since the fixing plate 30 is engaged with the battery main body 3 to prevent the wire connecting portion 11 from rotating together with the rotatable ring 21. At the final stage of the rotation, the lever 25 is pressed downward to deflect and brought under the hook 29 of the locking part 28. Upon returning the lever 25 to its original upper position when the lever 25 contacts the upward extending part of the locking part 28 after its 90° rotation, the engaging hole 26 of the lever 25 engages the leading end of the hook 29, i.e., the lever 25 or the rotatable ring 21 is immovably locked (see Fig. 5). After 90° rotation of the rotatable ring 21, the minor axis portions 22 thereof are located outside the major axis portions 15 of the fastening ring 13 and press them inwardly. As a result, the fastening ring 13 is bent inwardly about the minor axis portion 14 opposed to the slot 16 while narrowing the spacing of the slot 16. Thereby, the opposed projections 18 formed on the inner surface of the major axis portions 15 are tightly pressed against the outer surface of the battery post 4. In this way, the fastening ring 13 and the wire connecting portion 11, respectively, are immovably coupled with the battery post 4. In this state, the rotatable ring 21 is made immovable by engagement of the lever 25 with the locking part 28. This securely prevents the fastening ring 13 from being loosened due to rotation of the rotatable ring 21 in a loosening direction upon being subjected to vibrations, etc. during travel of a vehicle. This battery terminal is detached from the battery post 4 as follows. The engaging hole 26 is disengaged from the hook 29 of the locking part 28 in the state shown in Fig. 5, and the lever 25 is rotated counterclockwise by 90° in the drawing of Fig. 5. Then, the major axis portions 23 and minor axis portions 22 of the rotatable ring 21 are located outside the major axis portions 15 and minor axis portions 14 of the fastening ring 13, thereby allowing the fastening ring 13 to restore its original shape having a larger diameter. The loosened fastening ring 13 is pulled upward to be detached from the battery post 4. According to this embodiment, the battery terminal can be connected and detached by merely gripping and rotating the lever 25 by 90°. This operation is remarkably simple. Accordingly, even in the case where there is only a narrow operation space due to the presence of other equipment around the battery, the connection can be made easily and speedily. Further, the use of a tool such as a wrench is unnecessary. Particularly, in this embodiment, since the lever 25 can be locked, the loosening of the fastening ring 13 due to rotation of the rotatable ring 21 in a loosening direction upon being subject to vibration during travel of a vehicle can be securely prevented. The invention is not limited to the foregoing embodiment, but may be embodied, for example, in the following manners. These embodiments are also embraced by the technical scope of the invention. (1) Although both the fastening ring 13 and the rotatable 21 are of an elliptic shape in this embodiment, they may have any shape if they have major axis portions and minor axis portions and are rotatably fittable. For example, they may have an oblong circular or other noncircular cross-section. (2) It is most efficient to form the projections 18 of the fastening ring 13 on the inner surface of the major axis portions 15. However, a desired number of projections may be formed on the inner surface of the fastening ring 13 in any positions where the diameters can be reduced. (3) In the foregoing embodiment, the locking portions 19 of the fastening ring 13 are bent after the rotatable ring 21 is fitted around the fastening ring 13 in order to lock the coupling of the rings 13 and 21. The locking mechanism is not limited to this, but may be as follows. The locking portions 19 are each formed into a bent form and notches engageable with the locking portions 19 are formed on the inner surface of the rotatable ring 21 in positions corresponding to the locking portions 19. The rotatable ring 21 is fitted around the fastening ring 13 while engaging the locking portions 19 with the corresponding notches. When the rotatable ring 21 is rotated in this state, the locking portions 19 are disengaged from the notches, making it impossible for the rotatable ring 21 to be disengaged from the fastening ring 13. This mechanism obviates the need to bend the locking portions 19 after the rotatable ring 21 is fitted around the fastening ring 13, thereby enabling easier manufacturing.

Claims: A device for connection to a post comprising a connecting portion (11), a deformable fastening ring (13), and a rotatable means (21) comprising a lever (25), which is rotatably fittable around the outer surface of said fastening ring (13) and formed such that the diameter of said fastening ring (13) is made smaller by a rotation of said rotatable means (21) with respect to said fastening ring (13), characterized in that the rotatable means is a rotatable ring (21) comprising the lever (25), and in that a locking mechanism (26, 28) is arranged at the connecting portion (11) and the lever (25) provided for lockingly engaging the lever (25) with the connecting portion (11) in the position where the rotatable ring (21) deforms the fastening ring (13) to a smaller diameter. A device according to claim 1, wherein the locking mechanism (26,28) comprises an engaging hole (26) in the lever (25) of the rotatable ring (21) and a locking part (28) mounted on the fastening ring (13) and adapted to lockingly engage the engaging hole (26) when the rotatable ring (21) reaches the locking position. A device according to claim 1 or 2, wherein the post is a battery terminal post (4) and there is an electrically conductive wire attached to said device by a wire connecting portion (11). A device according to one of the claims 1 - 3, wherein the fastening ring (13) is formed unitarily with the wire connecting portion (11). A device according to one of the claims 1 - 4, wherein the fastening ring (13) has such a noncircular cross-section that it has major axis portions (15) and minor axis portions (14) and wherein the rotatable ring (21) has such a noncircular cross-section that it has major axis portions (23) and minor axis portions (22) and, to make the diameter of the fastening ring (13) smaller, is rotated from a position where the major and minor axis portions (23, 22) thereof are located outside the corresponding major and minor axis portions (15, 14) of the fastening ring (13). A device according to one of the claims 1 to 5, wherein at least one projection (18) is formed on the inner surface of the fastening ring (13). A device according to one of the claims 1 to 6, wherein the fastening ring (13) comprises a slot (16) adapted to narrow when the fastening ring (13) is deformed to make its diameter smaller. A device according to one of the claims 1 to 7, wherein the rotatable ring (21) and the lever (25) are integral. A device according to one of the claims 1 to 8, wherein a fixing portion (30) is provided for engaging a fixed base (3) to prevent the fastening ring (13) from rotating together with the rotatable ring (21).

Inventors: HATTORI KAZUHIKO, HATTORI, KAZUHIKO, HATTORI, KAZUHIKO, C/O SUMITOMO WIRING SYST., LTD.
Applicants: SUMITOMO WIRING SYSTEMS, SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1995
Main classification: H01R11
IPC codes: H01M2, H01R11, H01R4