SWIVEL JOINT

Abstract: A swivel joint includes a central member (12) having a joint barrel (25) having a first insertion hole (26) and a second insertion hole (27) parallel thereto, a slot (32) communicating with the first insertion hole (26), a pair of first confronting inner surfaces (29) defining the first insertion hole (26) and having a pair of first locking ledges (30) respectively, and a pair of second confronting inner surfaces (33) defining the sec­ ond insertion hole (27) and having a pair of second locking ledges (34), the first inner surfaces (29) including respective slanted surfaces (29a) slanted progressively inwardly toward each other. A retainer member (13) includes a retainer (38) fitted in the slot (32) and a pair of first resilient legs (39) projecting from the retainer (38) and inserted in the first insertion hole (26). The first resilient legs (39) hav­ ing respective first locking fingers (42) engaging the first locking ledges (30), respectively, and slidable respectively on the slanted surfaces (29a) under resiliency of the first resilient legs. A hook member (14) has a hook (44) and a pair of second resilient legs (45) projecting from the hook (44) and inserted in the second insertion hole (27), the second resilient legs (45) having respective second locking fingers (50) engaging the second locking ledges (34), respectively.

Description: The present invention relates to a swivel joint for use as a key holder or the like. GB-A-1 186 066 discloses a device having a rectangular metal case with an eye at one end for securing to a lead and its other end is open, these ends defining a longitudinal direction of the device in which the tensional force on the two coupled members is exerted. From this open end on one side of the case projects a curved hook member having its body secured in the case and its nose directed at approximately right angles to the said longitudinal direction, the underside of the nose being inclined or curved sufficiently to allow a collar ring to pull off the hook under longitudinal tension. A metal jaw is guided in the case for limited movement in the longitudinal direction and is normally urged outwards by a spring so that its nose lies close to the nose of the hook member, to retain the collar ring R. A forward end of the jaw nose is concave or grooved, and an operating pin or stud, secured to the body of the jaw, projects through a longitudinal slot in the case. EP-A-0 228 656 discloses a cord fastener comprising: (a) a male member composed of a head having a transverse through-hole for receiving therein a cord, and at least two resilient legs extending integrally and downwardly from said head and having feet projecting laterally outwardly from lower ends of the respective legs; and (b) a female member composed of a hollow body having an axial hole for receiving therein said legs and said head, said hollow body having a pair of diametrically opposite cord insertion holes communicating with said axial hole, and at least two locking teeth disposed below said cord insertion holes and projecting into said axial hole, said locking teeth being lockingly engageable with said feet respectively, to couple said male and female members together when said male member is inserted into said female member, said hollow body further having a downwardly tapered inner surface engaging said feet of said legs to urge said male member upwardly. Japanese Utility Model Publication No. 60-28294 published August 27, 1985 discloses a swivel joint for use as a key holder or the like. The disclosed swivel joint includes a cylindrical member, a release member and a ring member which are disposed in one end portion of the cylindrical member, and a hook member disposed in an opposite end portion of the cylindrical member. By pushing pressers of the release member into the cylindrical member, locking fingers of the hook member are released from ledges of the cylindrical member to allow the hook member to slide in a direction out of the cylindrical member through its opposite end portion When assembling the swivel joint, the release member are inserted into said one end portion of the cylindrical member and the hook member is inserted into the opposite end portion of the cylindrical member. This assembling process is tedious and time-consuming. For attaching a key to or detaching a key from the hook member, it is necessary to release the locking fingers from the ledges with the release member for permitting the hook member to slide with respect to the cylindrical member, attach or detach the key, and push the hook member again into the cylindrical member until the locking fingers engage the ledges. Therefore, the procedure of attaching or detaching a key is also tedious and time-consuming. In view of the aforesaid drawbacks of the conventional connector, the present invention seeks to provide a swivel joint which can be assembled with ease and allows a key or the like to be attached thereto and detached therefrom through a simple procedure. According to the present invention, there is provided a swivel joint comprising: a central member having a joint barrel having a first insertion hole and a second insertion hole which are defined therein parallel to each other at one front surface of said joint barree, a slot defined in a side wall of the joint barrel in communication with said first insertion hole, a pair of first confronting inner surfaces defining said first insertion hole therebetween and having a pair of first locking ledges respectively, and a pair of second confronting inner surfaces defining said second insertion hole therebetween and having a pair of second locking ledge, said first inner surfaces including respective slanted surfaces slanted progressively inwardly toward each other toward an inner closed end of said first insertion hole; a retainer member having a retainer fitted in said slot and a pair of first resilient legs projecting from said retainer and inserted in said first insertion hole, said first resilient legs having respective first locking fingers on distal ends thereof engaging said first locking ledges, respectively, and slidable respectively on said slanted surfaces under resiliency of said first resilient legs; and a hook member having a hook and a pair of second resilient legs projecting from said hook and inserted in said second insertion hole, said second resilient legs having respective second locking fingers engaging said second locking ledges, respectively. When installing the retainer member and the hook member in the joint barrel, the first resilient legs of the retainer member are inserted into the first insertion hole until the first locking fingers engage the first locking ledges, and the second resilient legs of the hook member are inserted into the second insertion hole until the second locking fingers engage the second locking ledges. For attaching a key or the like to or detaching a key or the like from the hook member, the retainer member is slid along the slot to force the first resilient legs to be elastically deformed as they move along the slanted surfaces. When the retainer member is released, the first resilient legs are caused to spring back under their own resiliency to displace the retainer member toward its lower position. Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which preferred structural embodiments incorporating the principles of the present invention are shown by way of example. Figure 1 is a front elevational view of a swivel joint according to a first embodiment of the present invention; Figure 2 is a front elevational view of a ring member and a central member of the swivel joint shown in Figure 1; Figure 3 is a righthand side elevational view of the ring member and the central member of Figure 1; Figure 4 is a cross-sectional view taken along line IV - IV of Figure 2; Figure 5 is a cross-sectional view taken along line V - V of Figure 2; Figure 6 is a cross-sectional view taken along line VI - VI of Figure 2; Figure 7 is a front elevational view of a retainer member of the swivel joint shown in Figure 1; Figure 8 is a cross-sectional view taken along line VIII - VIII of Figure 7; Figure 9 is a front elevational view of a hook member of the swivel joint illustrated in Figure 1; Figure 10 is a cross-sectional view taken along line X - X of Figure 9; Figure 11 is a cross-sectional view taken along line XI - XI of Figure 1 Figure 12 is a cross-sectional view taken along line XII - XII of Figure 1; Figure 13 is a front elevational view of the retainer member and the hook member as they are injection-molded together; Figure 14 is a front elevational view showing the manner in which the retainer member is slid with respect to a joint barrel of the ring member; Figure 15 is a cross-sectional view taken along line XV - XV of Figure 14; Figure 16 is a front elevational view of a swivel joint according to a second embodiment of the present invention; Figure 17 is a cross-sectional view taken along line XVII - XVII of Figure 16; Figure 18 is a front elevational view of a swivel joint according to a third embodiment of the present invention; and Figure 19 is a cross-sectional view taken along line XIX - XIX of Figure 18. Like or corresponding parts are denoted by like or corresponding reference numerals throughout views. The principles of the present invention are particularly useful when embodied in a swivel joint, generally designated at A, shown in Figure 1. As shown in Figure 1, the swivel joint A comprises a ring member 11, a central member 12, a retainer member 13, and a hook member 14, which are all molded of synthetic resin by injection molding. As illustrated in Figures 2 through 4, the ring member 11 is composed of a ring 17 for attachment to a string or a belt, and a holder barrel 18 holding the central member 12. The ring 17 is substantially of an annular shape projecting from an upper central portion of the holder barrel 18. The holder barrel 18 is substantially in the shape of a bifurcated rectangular parallelepiped having a pair of holders 19 spaced transversely of the ring 17 with a recess 20 of an inverted U shape being defined therebetween and opening downwardly. The recess 20 is of a horizontal size greater than the diameter of a shank 24 of the central member 12 and smaller than the diameter of a flange 23 of the shank 24. The holders 19 have respective holes 21 defined centrally therein in a direction transverse of the ring 17 perpendicularly to the recess 20. The holes 21 are of a horizontal size greater than the diameter of the flange 23 of the shank 24 and a vertical size greater than the thickness of the flange 23. As shown in Figures 2 through 6, the central member 12 comprises the shank 24 having the flange 23, and a cylindrical joint barrel 25. The shank 24 projects upwardly from a substantially central portion of the upper surface of the joint barrel 25 into the recess 20 in the ring member 11. The flange 23 is disposed on the upper end of the shank 24 and has a pair of diametrically opposite sides entering the respective holes 21 of the ring member 11. Therefore, the flange 23 of the shank 24 is retained by the holders 19 of the holder barrel 18 so that the central member 12 can swing with respect to the ring member 11 by a certain angle laterally of the ring member 11 in Figure 2 about the flange 23, and also rotate 360° about the shank 24. As shown in Figures 4 through 6, the joint barrel 25 has first and second insertion holes 26, 27 defined vertically therein parallel to each other and opening at the lower surface of the joint barrel 25. The insertion holes 26, 27 are of a substantially rectangular shape and extend axially in the joint barrel 25, the insertion holes 26, 27 being of the same depth. The first and second insertion holes 26, 27 are divided by a flat partition wall 28 (Figure 4) extending diametrically in the joint barrel 25 and upwardly. The first insertion hole 26 is defined between inner confronting side surfaces 29 extending parallel to the partition wall 28 and having a pair of locking steps or ledges 30 (Figure 5), respectively, substantially centrally thereon. The locking ledges 30 are defined respectively by a pair of window holes 31 defined in a peripheral side wall of the joint barrel 25 which has the inner confronting side surfaces 29. The locking ledges 30 are disposed in confronting relation to each other and project into the first insertion hole 26. The first insertion hole 26 has an inner end portion defined between confronting slanted surfaces 29a inclined progressively inwardly toward each other from upper edges of projecting inner surfaces 30a of the locking ledges 30. The first insertion hole 26 is held in communication with a slot 32 defined in the peripheral side wall of the joint barrel 25 between the window holes 31 for allowing the retainer member 13 to slide in and along the slot 32. The slot 32 extends axially in the joint barrel 25 and has its upper closed end positioned upwardly of the locking ledges 30. The second insertion hole 27 is defined between inner confronting side surfaces 33 extending parallel to the partition wall 28 and having a pair of locking steps or ledges 34 (Figure 6), respectively, which confront each other and project into the second insertion hole 27. The locking ledges 34 are defined respectively by a pair of window holes 35 defined in the peripheral side wall of the joint barrel 25 parallel to the window holes 31. The second insertion hole 27 has an inner end portion defined between confronting parallel surfaces 33a positioned inwardly of projecting inner surfaces 34a of the locking ledges 34. The second insertion hole 27 communicates with a slot 36 defined in the peripheral wall of the joint barrel 25 between the window holes 35 for allowing the hook member 14 to be positioned in the slot 36. The slot 36 extends axially in the joint barrel 25 and has its inner closed end located downwardly of the locking ledges 34. As shown in Figures 7 and 8, the retainer member 13 is constructed of a retainer 38, a pair of resilient legs 39, and a pusher 40. The retainer 38 is slightly thinner than the width of the slot 32 and has a length which is substantially the same as the length of the slot 32. The resilient legs 39 project upwardly from a base 41 extending laterally from the retainer 38 remotely from the pusher 40. The base 41 is positioned upwardly of the lower end of the retainer 38. The base 41 and the resilient legs 39 will fit into the first insertion hole 26 in the joint barrel 25. The resilient legs 39 have respective locking fingers 42 on their distal ends which project outwardly away from each other. The locking fingers 42 are situated upwardly of the upper end of the retainer 38 for engaging the locking ledges 30, respectively, in the first insertion hole 26. The vertical thickness of the locking fingers 42 is smaller than the height of the window holes 31. The pusher 40 is thicker than the retainer 38 and positioned in confronting relation to the resilient legs 39. As illustrated in Figures 9 and 10, the hook member 14 comprises a hook 44 and a pair of resilient legs 45. The hook 44 is substantially of a C shape and includes a wider arcuate web 46 on an inner peripheral side and a narrower arcuate ridge 47 on an outer peripheral side. The ridge 47 is longer than the web 46 and has a distal end extending upwardly beyond the distal end of the web 46. The ridge 47 has a fitting member 48 on an upper end opposite to the distal end thereof. The fitting member 48 is slightly thinner than the width of the slot 36 and has a length which is substantially the same as the length of the slot 36. The resilient legs 45 project upwardly from a base 49 extending laterally from the hook 44. The base 49 is located upwardly of the distal end of the ridge 47 of the hook 44. The base 49 and the resilient legs 45 will fit into the second insertion hole 27 in the joint barrel 25. The resilient legs 45 have respective locking fingers 50 on their distal ends which project outwardly away from each other. The locking fingers 50 are disposed upwardly of the fitting member 48 for engaging the locking ledges 34, respectively, in the second insertion hole 27. The vertical thickness of the locking fingers 50 is substantially the same as the height of the window holes 35. For installing the retainer member 13 and the hook member 14 in the joint barrel 25 of the central member 12, the resilient legs 39 of the retainer member 13 are inserted into the first insertion hole 26 from below the joint barrel 25, and then the resilient legs 45 of the hook member 14 are inserted into the second insertion hole 27 from below the joint barrel 25. When the retainer member 13 is thus inserted in the first insertion hole 26, the lower end of the retainer 38 projects from the lower surface of the joint barrel 25, and the locking fingers 42 of the resilient legs 39 engage the respective locking ledges 30 in the first insertion hole 26 (see Figure 11). The retainer 38 is fitted in the slot 32 and has its upper end spaced from the closed end of the slot 32. Therefore, the retainer member 13 as it is installed in position can slide toward the ring member 11 without swinging with respect to the joint barrel 25. When the hook member 14 is inserted in the second insertion hole 27, the distal end of the ridge 47 of the hook 44 is positioned outwardly of the lower end of the retainer 38 of the retainer member 13, and the locking fingers 50 of the resilient legs 45 engage the respective locking ledges 34 in the second insertion hole 27 (see Figure 12). The fitting member 48 of the hook member 14 is fitted in the slot 36 with the upper end of the fitting member 48 being held against the upper closed end of the slot 36. Consequently, the hook member 14 as it is installed in position does not swing with respect to the joint barrel 25. Figure 13 shows the manner in which the retainer member 13 and the hook member 14 are injection-molded together. As shown in Figure 13, the retainer member 13 and the hook member 14 are injection-molded together through two gates G₁, G₂ of an injection molding machine (not shown). For assembly, while the gates thus formed, also indicated at G₁, G₂, are left as they are, the retainer member 13 and the hook member 14 may be simultaneously inserted into the respective first and second insertion holes 26, 27, and thereafter the gates G₁, G₂ may be removed. This assembling process allows the retainer member 13 and the hook member 14 to be assembled more easily on the central member 12. A key or the like can be attached to or detached from the hook member 14 of the swivel joint A as follows: The retainer member 13 is pushed upwardly toward the ring member 11 by pressing a finger against the lower end of the pusher 40, as shown in Figure 14, so that the resilient legs 39 are elastically deformed inwardly toward each other as they slide up the slanted surfaces 29a of the first insertion hole 26 (see Figure 15). While keeping the retainer member 13 in the raised position, a key is attached to or detached from the hook 44 through its distal end, and then the pusher 40 of the retainer member 13 is released of the finger push. The resilient legs 39 are then forced under their own resiliency to spread outwardly away from each other as they slide down the slanted surfaces 29a, until the retainer member 13 is displaced downwardly away from the ring member 11 into the position shown in Figure 11. Accordingly, a key can be attached to and detached from the hook member 14 simply by sliding the retainer member 13 toward the ring member 11 and releasing the retainer member 13. Figures 16 and 17 show a swivel joint B according to a second embodiment of the present invention. The swivel joint B differs structurally from the swivel joint A in that the flange 23 of the swivel joint A is replaced with a pair of rods 52 projecting laterally away from each other into the respective holes 21. The central member 12 of the swivel joint B is allowed to swing about 180° laterally in Figure 16 with respect to the ring member 11. A swivel joint C according to a third embodiment of the present invention shown in Figures 18 and 19 differs structurally from the swivel joint A of the first embodiment in that the flange 23 of the swivel joint A is replaced with a spherical member 53. The central member 12 of the swivel joint C is allowed to swing about 180° laterally in Figure 18 and also to rotate 360° about the shank 24. With the arrangement of the present invention, since the first and second insertion holes 26, 27 are defined parallel to each other in the joint barrel 25 and open at the lower end of the joint barrel 25, the retainer member 13 and the hook member 14 can be inserted into the respective insertion holes 26, 27 from the lower end of the joint barrel 25. Therefore, the retainer member 13 and the hook member 14 can easily be assembled into the joint barrel 25 through a simpler process than the conventional process. Moreover, the inner end portion of the first insertion hole 26 in which the retainer member 13 is inserted is defined between the slanted surfaces 29a. The slanted surfaces 29a allow the resilient legs 39 of the retainer member 13 which has been pushed into the joint barrel 25 by the pusher 40 can slide back under their own resiliency to displace the retainer member 13 back to its lower position. Accordingly, a key or the like can be attached to and detached from the hook member 14 more easily than with the conventional swivel joint.

Claims: 1. A swivel joint (A; B; C) comprising: a central member (12) having a joint barrel (25) having a first insertion hole (26) and a second insertion hole (27) which are defined therein parallel to each other at one front surface of said joint barrel (25), a slot (32) defined in a side wall of the joint barrel (25) in communication with said first insertion hole (26), a pair of first confronting inner surfaces (29) defining said first insertion hole (26) therebetween and having a pair of first locking ledges (30) respectively, and a pair of second confronting inner surfaces (33) defining said second insertion hole (27) therebetween and having a pair of second locking ledges (34), said first inner surfaces (29) including respective slanted surfaces (29a) slanted progressively inwardly toward each other toward an inner closed end of said first insertion hole (26); a retainer member (13) having a retainer (38) fitted in said slot (32) and a pair of first resilient legs (39) projecting from said retainer (38) and inserted in said first insertion hole (26), said first resilient legs (39) having respective first locking fingers (42) on distal ends thereof engaging said first locking ledges (30), respectively, and slidable respectively on said slanted surfaces (29a) under resiliency of said first resilient legs; and a hook member (14) having a hook (44) and a pair of second resilient legs (45) projecting from said hook (44) and inserted in said second insertion hole (27), said second resilient legs (45) having respective second locking fingers (50) engaging said second locking ledges (34), respectively. 2. A swivel joint (A; B; C) according to claim 1, said joint barrel (25) having a pair of first window holes (31) defined in a peripheral side wall thereof and confronting each other, said first locking fingers (42) being disposed respectively in said first window holes (31). 3. A swivel joint (A; B; C) according to claim 1 or 2, said joint barrel (25) having a pair of second window holes (35) defined in a peripheral side wall thereof and confronting each other, said second locking fingers (50) being disposed respectively in said second window holes (35). 4. A swivel joint (A; B; C) according to claim 1, 2 or 3, said slot (32) being longer than said retainer (38). 5. A swivel joint (A) according to any one of claims 1 to 4, further comprising a ring member (11), said central member (12) including a shank (24) having a flange (23) movably retained in said ring member (11). 6. A swivel joint (B) according to any one of claims 1 to 4, further comprising a ring member (11), said central member (12) including a shank (24) having a pair of rods (52) movably retained in said ring member (11). 7. A swivel joint (C) according to any one of claims 1 to 4, further comprising a ring member (11), said central member (12) including a shank (24) having a spherical member (53) movably retained in said ring member (11).

Inventors: KASAI, KAZUMI
Applicants: YOSHIDA KOGYO K.K.
Application year: 1988
Main classification: F16G15
IPC codes: F16B45, A44B15, A47G29, F16G15