Reverse rotation preventing mechanism in spinning reel for fishing

Abstract: A reverse rotation preventing mechanism in a spinning reel for fishing is characterized in that a rotor (3) is secured to a rotary quill (2), which is rotated by the turning of a handle (12) in kinematic conjunction therewith; a reverse rotation prevention member having reverse rotation prevention engagement portions is rotatably supported concentrically to the quill (2); a reverse rotation prevention claw (5) is supported by the body of the reel so as to be swingable, and can be engaged with one of engagement portions; and a roller-type one-way clutch is provided between the rotor (3) and the reverse rotation prevention member. When the rotor (3) is reversely rotated in such a direction as to wind a fishline, the clutch member connects kinematically the rotor (3) to the reverse rotation prevention member (4).

Description: BACKGROUND OF THE INVENTION The present device relates to a reverse rotation prevention mechanism which is in a spinning reel for fishing and includes a roller-type clutch in accordance with the preamble of claim 1. Such a device is known from JP-U-6438963. Although the reverse rotation of a ratchet is conventionally prevented by a reverse rotation prevention claw engaged with the ratchet, there is a problem that since the number of the teeth of the ratchet is small, the angle of the play of the ratchet until the completion of the prevention of the reverse rotation thereof is too large to quickly prevent the reverse rotation by engaging the claw with the ratchet. To solve the problem, a reverse rotation prevention mechanism in which a roller-type one-way clutch is fitted in a ratchet not to rotate relative thereto and the rollers of the clutch are fitted in the peripheral portion of a rotary quill to make it possible to prevent the reverse rotation of the ratchet with less play thereof until the completion of the prevention was proposed as disclosed in the Japan Utility Model Application (OPI) No. 38963/89 (the term "OPI" as used herein means an "unexamined published application"). However, since the diameter or the rotary quill in which the rollers of the roller-type one-way clutch of the mechanism disclosed in the Japan Utility Model Application mentioned above are fitted is small, the circumferential velocity of the roller contact surface of the quill is so low that there is a problem that the rollers are not instantaneously and surely pinched between the quill and the ratchet to prevent the reverse rotation thereof. Besides, since the engagement surfaces of the components of the mechanism are likely to be locally loaded in the engagement of the components for the prevention of the reverse rotation of the ratchet so as to be deformed, there is a problem that the durability of the mechanism is low. In addition, since the roller-type one-way clutch is a generally purchasable one, the inside and outside diameters thereof are limited so as to lower the degree of freedom of design of the mechanism to cause a problem that the mechanism is not appropriate to a compact reel. Further, since there is a resistance to the rotation of the roller-type one-way clutch itself in the direction for the disengagement thereof and the rotation speed of the rotor of the spinning reel or that of the spool of a reel whose spool shaft is supported at both the ends thereof has an influence, the ratchet is rotated in kinematic conjunction with the rotation of the rotor or the spool in the direction for the winding of the fishline so as to move the claw out of the position of the engagement with the ratchet to make it impossible to instantaneously prevent the reverse rotation of the rotor of the spool. SUMMARY OF THE INVENTION The present device was made in order to solve the problems mentioned above. Accordingly, it is an object of the device to provide a reverse rotation prevention mechanism which is for a spinning reel for fishing and is such that the reverse rotation of the rotor of the reel is instantaneously and surely prevented by the mechanism, the durability of the mechanism is high, the dimensions of the mechanism are not much restricted, the degree of freedom of design of the mechanism is high, and the mechanism is appropriate to a compact reel as well. The object of the present invention is solved by a reverse rotation preventing mechanism in accordance with the features of claim 1. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a partially sectional side view of a spinning reel which is for fishing and provided with a reverse rotation prevention mechanism; Fig. 2 is an enlarged sectional view of the reel along a line II-II shown in Fig. 1; Fig. 3 is an enlarged sectional view of the reel along a line III-III shown in Fig. 1; Fig. 4 is a perspective view of the spring of the mechanisms; Fig. 5 is a partially sectional side view of a spinning reel which is for fishing and provided with a reverse rotation prevention mechanism which is a modification of the foregoing device and in accordance with the present invention; and Fig. 6 is an enlarged sectional view of the reel along a line VI-VI shown in Fig. 5; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Figs. 1, 2, 3 and 4 show a reverse rotation prevention mechanism which is for a spinning reel for fishing. In the reel, a ring 10 is fitted on a rotary quill 2 projecting forward from the body 1 of the reel, and a rotor 3 is fitted on the quill in front of the ring and secured to the quill by a nut 11, as shown in Fig. 1, so that the rotor is rotated by the turning of a handle 12 in kinematic conjunction therewith. A spool 14 is supported on the front end portion of a spool shaft 13 fitted in the rotary quill 2 and projecting therefrom, so that the spool is reciprocated backward and forward by the turning of the handle 12 in kinematic conjunction therewith. A reverse rotation prevention member 4 is rotatably supported on the ring 10, and includes a perfectly circular portion 4a on which a plurality of rollers 15 are provided, and a plurality or reverse rotation prevention engagement portions 4b. The tip portion 5a of a reverse rotation prevention claw 5 is located near the reverse rotation prevention engagement portions 4b of the member 4 so that the tip portion can be engaged with one of the engagement portions, as shown in Fig. 2. The claw 5 is supported by the body 1 of the reel so that the claw can be swung. A spring 16 urges the claw 5 in such a direction as to engage the tip portion 5a thereof with one of the rotation prevention engagement portions 4b. The position of the claw 5 is controlled by a cam member 17 so that the tip portion 5a of the claw is engaged with or disengaged from the engagement portion 4b. The rotor 3 has an annular projection 3a extending in the rear recess of the rotor and having a plurality of recesses 3c having bottoms 3b extending nearly in the circumferential direction of the rotor and slightly outward in the direction of the reverse rotation of the rotor, as shown in Fig. 3. The rollers 15 are provided in the recesses 3c and urged by springs 6 counterclockwise with regard to Fig. 3. Each of the springs 6 includes pushing portion 6a for pushing the roller 15 on the outside circumferential surface thereof, a coming-off prevention portion 6b located in contact with the end face of the rotor to prevent it from coming off, and a secured portion 6c, as shown in Fig. 4. The secured portion 6c is fitted in the groove 3d of the annular projection 3a of the rotor 3 and secured thereto by a screw 18. The roller-type clutch of the reverse rotation prevention mechanism includes the reverse rotation prevention member 4, the recesses 3c, the rollers 15, and the springs 6. When the handle 12 is turned in such a direction that a fishline not shown in the drawings is wound on the spool 14, the rotor 3 is rotated clockwise with regard to Fig. 2 and the rotary quill 2 and the rotor are rotated counterclockwise with regard to Fig. 3. At that time, the rollers 15 are rotated in the recesses 3c so that the rotor 3 and the reverse rotation prevention member 4 are not kinematically connected to each other. For that reason, the member 4 engaged at the engagement portion 4b thereof with the tip portion 5a of the reverse rotation prevention claw 5 as shown in Fig. 2 is not rotated. When the fishline wound on the spool 14 is then unwound therefrom by the pull of a fish, the rotor 3 is reversely rotated counterclockwise with regard to Fig. 2 or clockwise with regard to Fig. 3. At that time, because of the reverse rotation of the rotor 3, each of the rollers 15 is pinched between the perfectly circular portion 4a of the reverse rotation prevention member 4 and the bottom 3b of the recess 3c of the rotor so that the rotor and the member are kinematically connected to each other to transmit the torque of the rotor to the member to rotate it in the same direction as the rotor. However, since the engagement portion 4b of the member 4 is already engaged with the tip portion 5a of the reverse rotation prevention claw 5 as shown in Fig. 2, the member cannot be rotated, namely, the rotor 3 cannot be reversely rotated any more. If the claw 5 is swung counterclockwise by the cam member 17 against the urging force of the spring 16 in advance, as shown by a two dot chain line in Fig. 2, so that the tip portion 5a of the claw is disengaged from the engagement portion 4b of the member 4, the rotor 3 and the member can be reversely rotated continuously. Since the perfectly circular portion 4a of the reverse rotation prevention member 4 is large in diameter, the circumferential velocity of the roller contact surface of the portion is high enough to immediately prevent the reverse rotation of the rotor 3 and reverse rotation prevention mechanism is high in durability. Since the mechanism is not much restricted of the dimensions thereof, the mechanism is high in the degree of freedom of design. Therefore, the mechanism is appropriate to a compact reel as well. Figs. 5 and 6 show a reverse rotation prevention mechanism which is a modification of the device described above and in accordance with the present invention. In the modification, a rotor 3 has an annular projection 3a formed separately from the body of the rotor. A ring 7 of the same form as the annular projection 3a is secured to the rotor 3 by a plurality of screws 19. A reverse rotation prevention member 4 includes a perfectly circular portion 4a on which a plurality of rollers 15 are provided, a plurality of reverse rotation prevention engagement portions 4b, and a plurality of roller coming-off prevention portions 4c for preventing the rollers from coming off. Springs 6 have no roller coming-off prevention portion. The ring 7 has a plurality of recesses 7b having bottoms 7a extending nearly in the circumferential direction of the ring and slightly outward in the direction of the reverse rotation of the rotor 3. The springs 6 and the roller coming-off prevention portions 4c in the embodiment and the modification may be otherwise shaped and secured. The modification is the same in operation and effect as the device described above. In a reverse rotation preventing mechanism provided in accordance with the present device, in a spinning reel for fishing, since the roller-type one-way clutches are provided between the rotor and the reverse rotation prevention member, the engagement surfaces of the components of the mechanism are not to be locally loaded. Therefore, the durability of he engagement surfaces in the reverse rotation of the rotor can be enhanced and the high precision can be maintained in a long period. Besides, since the prevention member are provided to the reverse rotation prevention claw and a member corresponding to the claw, and the claw remains engaged with the ratchet without a clearance between them, the rotor is surely and instantaneously prevented from rotating reversely. In addition, in the present invention, since the clutch member is provided within the limited space, that is, the space between the rotor and the reverse rotation prevention member, so as to utilize usefully there, the mechanism can be appropriate to a compact reel. Further, according to the present invention, the weight of the construction becomes to be light and the manufacture cost can be reduced.

Claims: A reverse rotation preventing mechanism in a spinning reel for fishing comprising: a rotor quill (2) rotatably supported by a spool shaft (13), said rotor quill (2) being rotatable by the turning of a handle (12,) in kinematic conjunction therewith; a rotor (3) secured to said rotor quill (2); a reverse rotation prevention member (4) having engagement portions (4b) for preventing reverse rotation, said reverse rotation prevention member (4) being rotatably supported concentrically to said rotor quill (2); a reverse rotation prevention claw (5) supported by a reel body (1) so as to be swingable, said reverse rotation prevention claw (5) being able to be engaged with one or said reverse rotation engagement portions (4b); a clutch means (15) rotatable only in one way direction with respect to the reverse rotation prevention member (4) on a circular portion (4a) of the reverse rotation prevention prevention member (4) and connecting kinematically said rotor (3) to said reverse rotation prevention member (4), when said rotor (3) is reversely rotated in such a direction as to unwind a fishline, characterized by a ring member (7) non-rotatably arranged with respect to the rotary quill (2) and rotor (3) and disposed concentrically to the axis of said rotary quill (2), said reverse rotation prevention member (4) having said circular portion (4a) radially located inside relative to the ring member (7), said clutch means (15) being provided between said circular portion (4a) and said ring member (7). A reverse rotation preventing mechanism according to claim 1, wherein said clutch means (15,115) is comprised of roller-type one-way clutches. A reverse rotation preventing mechanism according to claim 2, further comprising a control means (17,106) for controlling said reverse rotation prevention claw (5,105) so as to be engaged with or disengaged from one of said engagement portions (4b,104b). A reverse rotation preventing mechanism according to claim 2, wherein said roller-type one-way clutches (15,115) are provided between a backward recess portion (3a,103a) of said rotor (3,103) and a forward portion of said reel body (1,100), and is rotatably supported concentrically to said rotor quill (2,102). A reverse rotation preventing mechanism according to claim 2, further comprising a means (16,116,117) for preventing said reverse rotation prevention claw (5,105) from being disengaged from one of said engagement portions (4b,104b) in the case where said reverse rotation prevention member (4,104) is rotated in such a direction as to wind said fishline. A reverse rotation preventing mechanism according to claim 5, wherein said prevention means (16,116,117) is comprised of a spring member which spring-urges said reverse rotation prevention claw (5,105) so as to engage with one of said engagement portions (4b,104b). A reverse rotation preventing mechanism according to claim 5, wherein said prevention means (116,117) is provided to said reverse rotation prevention claw (105) and a member (106) corresponding to said reverse rotation prevention claw (105). A reverse rotation preventing mechanism according to claim 1, wherein said clutch means is comprised of clutch gears (206,306) which are rotatably provided between a backward recess portion of the rotor (203,303) and said rotor quill (202,302). A reverse rotation preventing mechanism according to claim 8, wherein each of said clutch gears (206,306) has a roller-type one-way bearing (207,307) and is fixedly secured to an outer peripheral surface of said bearing (207,307).

Inventors: HIRANO KAZUO, YAMAGUCHI NOBUYUKI, HIRANO, KAZUO, YAMAGUCHI, NOBUYUKI
Applicants: DAIWA SEIKO INC, DAIWA SEIKO INC.
Application year: 1991
Main classification: A01K89
IPC codes: A01K89