LOCKING APPARATUS FOR SHIFT LEVER

Abstract: A locking apparatus for a shift (1) lever provided for operating an automatic transmission, where if the shift (1) lever is not located in a non-driving position such as a "P" range, a key rotor (23) cannot be rotated to a lock position and, if the key (23) rotor is not rotated from the lock position to an operating position, the shift (1) lever cannot be moved from the non-driving position. An extension (28) is interlocked with a detent (7) pin which serves to hold the shift lever in the non-driving position. The extension (28) is arranged to move along the axis of the key (23) rotor in interlocked relationship with the movement of the detent (7) pin and to move into and away from the locus of movement of a lock (25) portion which is rotated together with the key (23) rotor. When the extension (28) is moved into the locus, the extension inhibits both the movement of the key (23) rotor to the lock position and the shifting of the shift (1) lever from the non-driving position to another position.

Description: BACKGROUND OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a locking apparatus for a shift lever in a vehicle and, more particularly, to a locking apparatus for a shift lever interlocked with a key rotor which is rotated by means of an ignition key. DESCRIPTION OF THE RELATED ART In general, when an occupant parks and leaves a vehicle provided with an automatic transmission, a shift lever is shifted to a "P" position, an ignition key is used to rotate a key rotor of a key cylinder to a "LOCK" position which serves as a lock position where all the operations are locked, and the key is pulled out of the key rotor. When starting the vehicle, the key is inserted into the key rotor while keeping the shift lever in the "P" position, the key rotor is rotated from the "LOCK" position to a "START" position through "ACC" and "ON" positions by means of the key to drive the engine, and the shift lever is shifted to a driving position such as a "D" position or an "R" position, thereby the vehicle runs. Such a conventional type of vehicle is usually arranged such that, even when no key is inserted into the key rotor, or even when the key rotor is located in the "LOCK" position, the shift lever can be shifted from the "P" position to another position, as well as such that even when the shift lever is located in any one of the positions other than the "P" position, the key can be rotated to the "LOCK" position and pulled out of the key rotor. Accordingly, a shift-lever locking apparatus has been proposed to provide that key operation is carried out simultaneously with shift-lever operation. For instance, United States Patent No. 4,671,085, Japanese Patent Application Laid-open Nos. 135352/1985 and 137234/1984 disclose respectively a shift lever apparatus of that kind. In this known shift lever locking apparatus a cam member is coupled to the axial extension of an ignition lock, which member can be rotated uniformly with the ignition lock. This cam member engages with a latch member movable radially to the cam member, which latch member can be operatively connected to a linear movable slide member by rotating the ignition lock. To this end a narrow opening is formed at the slide member into which the latch member can be inserted for arresting the shift lever. In order to ensure an exact and faultless interplay of the latch member and of the slide member, disadvantageously high standards with regard to the dimensional accuracy of the individual components have to be set. However, after several years of operatin deformations of the components occur due to wear which can lead to an operational failure. It follows therefrom as a further disadvantage that in this embodiment a blocking or jamming of the latch member simultaneously means a blocking of the ignition lock, so that in this case the engine of the vehicle can no longer be started. It is the object underlying the subject matter of the application to develop the shift lever locking apparatus according to the preamble of the claim 1 further in such a way that the operability of the shift lever locking appratus is ensured with a minimal productive effort. This object is solved according to the application by the features in the characterizing portion of the new main claim. Accordingly, this locking apparatus arranged at the ignition lock has only two components of functional importance, namely the lock portion and the lock bar. By arranging these two parts substantially in parallel the operative engagement of the lock bar with the lock portion is largely independent of dimensional tolerances and guiding accuracies. The circular segment of the lock portion which effects an arresting of the ignition key as well as a blocking of the shift lever in a parking position limits the movability of the engaged lock bar only at one end surface, so that even in case of alterations of the individual components, e.g. a lengthening of the control wire, the operability of the lock mechanism remains unaffected. In addition, the arrangement according to the invention has the advantage that in case of the destruction of a component due to wear, e.g. a tearing-off of the control wire, the lock bar moves beyond the end surface of the circular segment, so that a normal operation of the vehicle remains possible. United States Patent No. 4,724,722 discloses a shift lever apparatus in which a shift lever and a key are relatedly moved by means of a control cable. The relationship between a key cylinder lock and a control wire is such that a latch pin which is moved in the radial direction of a key cylinder by a key operation is fixed to one end of a control cable so as to control movement of a slide member which is adapted to linearly move. For this reason, this apparatus still causes problems that a large number of parts or members are required in a coupling structure between the control cable and the key cylinder lock and that an excessive load tends to occur in the latch pin for inhibiting a slider from linearly moving. BRIEF DESCRIPTION OF THE DRAWINGS Fig.1 is a cross-sectional view of an ignition key apparatus to which the present invention is applied; Fig.2 is a side elevational view of a shift lever according to a first embodiment; Fig.3 is a side elevational view showing an operation of the shift lever shown in Fig.2; Fig.4 is a frount view of a key rotor, taken along the axis thereof, according to the first embodiment; Fig.5 is a perspective view showing a relationship between a lock bar and a lock porition in the first embodiment; Fig.6 is a cross-sectional view showing an operation of the ignition key apparatus shown in Fig.1; Fig.7 is a perspective view showing an operation of the lock bar and the lock portion shown in Fig.5; Fig.8 is a perspective view showing a relationaship between a lock bar and a lock portion in a second embodiment corresponding to Fig.5; Fig.9 is a cross-sectional view of an ignition key apparatus of a third embodiment corresponding to Fig.1; Fig.10 is a schematic view including a shift lever of the third embodiment corresponding to Fig.2; Fig.11 is an operational view the third embodiment shown in Fig.10; Fig.12 is a perspective view showing a relationship between a lock bar and a lock portion in the third embodiment; Fig.13 is a cross-sectional view showing an operation of the ignituion key apparatus shown in Fig.9; and Fig.14 is a perspective view showing an operation between the lock bar a lock portion shown in Fig.12. DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Referring to Fig. 2, a shift lever 1 is supported by a shaft 3 mounted in a frame 2, and can be rotated, both in the direction indicated by an arrow head A and in the direction opposite thereto, about the shaft 3 which serves as a fulcrum. A detent plate 4 is fixed to the frame 2, and an engagement aperture 6 is formed in the detent plate 4. The engagement aperture 6 has a restricting portion 5 which is formed in a stepwise manner in the direction of rotation of the shift lever 1. The engagement aperture 6 cooperates with a detent pin 7 which is described later to control the rotation of the shift lever 1 when the shift lever 1 is to be shifted to any one of a "P (parking)" position, an "R (reverse)" position, an "N (neutral)" position, a "D (drive)" position, a "2 (second)" position and an "L (low)" position. A portion of the engagement aperture 6 has a lock recess 8 at a location corresponding to the "P" position which serves as a particular non-driving position. A detent shaft 7A is disposed in the shift lever 1 for movement along the axis of the shift lever 1, and the detent pin 7 is attached to the distal end portion of the detent shaft 7A in such a manner as to project in a direction perpendicular to the axis of the detent shaft 7A, that is toward the obverse side of the sheet of Fig. 2. The detent shaft 7A is urged toward a pushbutton 9 by the urging force of a compression coil spring 7B. Accordingly, when the pushbutton 9 provided on the top of the shift lever 1 is depressed, the detent shaft 7A is caused to travel downwardly in Fig. 2 and thus the detent pin 7 is disengaged from the restricting section 5 of the shift-lever position at which the detent pin 7 has been engaged. When the depression of the pushbutton 9 is released, the detent shaft 7A is caused to travel upwardly by the urging force of the compression coil spring 7B and thus the detent pin 7 engages with an engagement surface which corresponds to any of the six shift-lever positions provided in the restricting portion 5. In this state, the detent pin 7 cooperates with the detent plate 4 to restrict the rotary operation of the shift lever 1. A shift-lever locking apparatus 10 will be described below. An engagement recess 12 whose opening faces to the right in Fig. 2 is formed in an upper portion of the shift lever arresting mechanism 11 which constitutes a part of the locking apparatus 10. A slot 13 is formed in an upper left-hand portion of the shift lever arresting mechanism 11, and a pin 14 which is disposed in an upright manner on the detent plate 4 in the vicinity of the lock recess 8 is inserted in the slot 13. The shift lever arresting mechanism 11 is arranged such that the relative movement between the slot 13 and the pin 14 causes the engagement recess 12 to move along the line which connects the axis of the shaft 3 and the lock recess 8. One end of a lever 15 is pivotally coupled to the lower end of the shift lever arresting mechanism 11 by means of a shaft 17. An intermediate portion of the lever 15 is rotatably supported on the detent plate 4 by means of a shaft 16, and an arm 18 integral with the lever 15 extends therefrom. One end of a control wire 19 which serves as a coupling member is connected to the extending end of the arm 18, and the other end of the control wire 19 is connected to a lock bar 27 which will be described later. When the shift lever 1 is, as shown in Fig. 2, located in any one of the positions other than the "P" position, the shift-lever locking apparatus 10 is unlocked. Accordingly, in this state, when the shift lever 1 is operated in the direction opposite to the arrow head A and shifted to the "P" position while the pushbutton 9 is being depressed, the detent pin 7 engages with the engagement recess 12 formed in the shift lever arresting mechanism 11. When the depression of the pushbutton 9 is released, the detent pin 7 together with the shift lever arresting mechanism 11 is moved upwardly as shown in Fig. 3 by the urging force of the compression coil spring 7B which acts upon the detent pin 7, and thus the detent pin 7 engages with the lock recess 8. Simultaneously, the arm 18 of the lever member 15 is rotated about the shaft 16 in the direction indicated by an arrow head B and the shift-lever locking apparatus 10 is placed in a locked state. Referring to Fig. 1, a key cylinder 20 is accommodated in a housing 21 which is fixed to a steering column (not shown). As shown in Fig. 4 a key rotor 20 B having a key hole 20A on its axis is rotatably incorporated in the key cylinder 20. When the key rotor 20B is switched to a "LOCK" position which serves as a lock position, an ignition key 22 can be inserted into and pulled out of the key hole 20A. When the inserted key 22 is rotated in the direction indicated by an arrow head C, the key rotor 20B can be shifted to a desired one of operating positions "ACC", "ON" and "START" and, at the desired operating position, the key 22 cannot be pulled out. One end of a ignition lock shaft 23 which rotates integrally with the key rotor 20B is coaxially connected to the rear end of the key rotor 20B. The other end of the ignition lock shaft 23 is coupled to an ignition switch 24. As shown in Fig. 1 as well as Fig. 5, a lock portion 25 having an approximately semicircular shape in cross section is disposed on the outer periphery of an intermediate portion of the ignition lock shaft 23. The lock portion 25 has an end surface 25A which extends in the radial direction of the shaft 23, and a brim-shaped portion 26 of approximately semicircular shape extends from the edge portion of the end surface 25A opposite to the key cylinder 20. As viewed in the direction of the axis of the ignition lock shaft 23, the brim-shaped portion 26 and the lock portion 25 constitute a circle. A cutaway step 25B is formed in the portion of the end surface 25A which is nearer to the outer periphery of the lock portion 25, and the cutaway step 25B serves to receive the lateral extension 28 of a lock bar 27. The other end of the lock wire 19 is connected to one end of the lock bar 27. The lock bar 27 is supported in the housing 21 for movement in parallel with the ignition lock shaft 23 both in the direction indicated by an arrow head D and in the direction opposite to the arrow head D and the lateral extension 28 is fixed to the other end of the lock bar 27 at right angles to the axis thereof. A receiving extension 29 projects from the other end of the lock bar 27 in the direction opposite to the lateral extension 28. A compression coil spring 30 is disposed between the receiving extension 29 and a receiving portion 21A formed on the housing 21. The lock bar 27 is urged in the direction of the arrow head D by the compression coil spring 30. As shown in Fig. 1, a cam 31 projects from the outer periphery of the rear end of the ignition lock shaft 23. A lock bar (not shown) is connected to a frame 32 which is moved by the cam 31, and when the key rotor 20B is rotated to the "LOCK" position, one end of the lock bar is brought into engagement with the steering shaft and thus the steering shaft is locked. Figs. 1 and 5 show the state wherein the key rotor 20B is located in the "ACC" position, the shift-lever locking apparatus 10 is unlocked, and the lock bar 27 is located in a first position in which it is pulled in the direction opposite to the arrow head D by means of the control wire 19. In this state, the lateral extension 28 of the lock bar 27 engages with the step 25B of the lock portion 25 and is, therefore, located in the locus of rotation of the lock portion 25. Thus, the lateral extension 28 inhibits the rotation of the lock portion 25 and hence the rotation of the key rotor 20B in the direction opposite to the arrow head C. Furthermore, in this state, the right-hand surface of the lateral extension 28, as shown in Fig. 1, is opposed to a left-hand surface 26A of the brim-shaped portion 26 with a predetermined gap "g" formed therebetween. As shown in Fig.3, when, in this state, the shift lever 1 is shifted to the "P" position to lock the shift-lever locking apparatus 10 as described above, the lock bar 27 is moved in the direction of the arrow head D by means of the control wire 19 and is thus located in a second position as shown in Figs. 6 and 7. In the second position, the lateral extension 28 is located outside the locus of rotation of the lock portion 25 and, therefore, the rotation of the lock portion 25 and hence the rotation of the key rotor 20B in the direction opposite to the arrow head C are allowed. When the key rotor 20B is rotated to the "LOCK" position, the left-hand surface of the lock portion 25 opposes the right-hand surface of the lateral extension 28B to inhibit the lock bar 27 from moving in the direction opposite to the arrow head D. The operation of the shift-lever locking apparatus 10 having the above-described arrangement and construction will be described below. If the shift lever 1 is, as shown in Fig. 2, located in any one of the positions other than the "P" position, for example, the "N" position, the shift-lever locking apparatus 10 is unlocked and rotary operation of the shift lever 1 is enabled. Since, in this state, the arm 18 of the lever member 15 is rotated in the direction opposite to the arrow head B, the lock bar 27 is pulled in the direction opposite to the arrow head D as shown in Figs. 1 and 5 and is thereby located in the first position. In this state, the key rotor 20B can be rotated between the "ACC" position and the "START" position. However, since the lateral extension 28 of the lock bar 27 is located in the locus of rotation of the lock portion 25, the rotation of the key rotor 20B from the "ACC" position in the direction opposite to the arrow head C is inhibited by the lateral extension 28 and, therefore, the key rotor 20B cannot be rotated to the "LOCK" position. Accordingly, in a state wherein the shift lever 1 is located in any one of the positions other than the "P" position, it is impossible to rotate the key rotor 20B to the "LOCK" position and hence to pull the key 22 out of the key rotor 20B. When, in the state shown in Fig. 2, the shift lever 1 is shifted to the "P" position by rotating it in the direction opposite to the arrow head A while depressing the pushbutton 9, the detent pin 7 engages with the engagement recess 12 formed in the shift lever arresting mechanism 11. When the depression of the pushbutton 9 is released in this state, the detent pin 7 together with the movable member 11 engages with the lock recess 8 as shown in Fig. 3. Simultaneously, the arm 18 of the lever member 15 is rotated in the direction of the arrow head B. As the arm 18 is rotated, the lock bar is moved from the first position in the direction of the arrow head D by means of the control wire 19 and thus the lock bar 27 is located in the second position. In this state, the lateral extension 28 of the lock bar 27 is located outside the locus of rotation of the lock portion 25, and the rotation of the key rotor 20B in the direction opposite to the arrow C is allowed. Thus, the key rotor 20B can be rotated to the "LOCK" position. When the key rotor 20B is rotated to the "LOCK" position, the key 22 can be pulled out of the key rotor 20B. In the meantime, the frame 32 is moved by the motion of the cam 31 and the steering shaft is locked by the lock bar (not shown) and the left-hand surface of the lock portion 25 opposes the lateral extension 28 of the lock bar 27 as shown in Figs. 6 and 7. In this state, the movement of the lock bar 27 in the direction opposite to the arrow head D is inhibited, and hence the rotation of the lever member 15 of the shift-lever locking apparatus 10 in the direction opposite to the arrow head B is inhibited. Accordingly, even if, in this state, the pushbutton 9 of the shift lever 1 is depressed, the detent pin 7 cannot be disengaged from the lock recess 8 since the downward movement of the detent pin 7 is inhibited. In consequence, the shift lever 1 is non-rotatably locked. In this state, when the ignition key 22 is inserted into the key rotor 20B to rotate the key rotor 20B in the direction of the arrow head C until it reaches an operating position, the movement of the lock bar 27 in the direction opposite to the arrow head D is allowed. When the pushbutton 9 of the shift lever 1 is depressed, the detent pin 7 together with the shift lever arresting mechanism 11 is moved downwardly and disengaged from the lock recess 8. Thus, it becomes possible to shift the shift lever 1 to another position. In the above-described embodiment, in a state wherein the shift lever 1 is shifted to any one of the positions other than the "P" position, the lateral extension 28 of the lock bar 27 is located in the locus of rotation of the lock portion 25 and, therefore, the key rotor 20B cannot be rotated to the "LOCK" position. Accordingly, it is possible to prevent a seat occupant from mistakenly pulling the ignition key 22 out of the key rotor 20B during running of the vehicle. Furthermore, when the seat occupant needs to leave the vehicle which has been parked, he always shifts the shift lever 1 to the "P" position, rotates the key rotor 20B to the "LOCK" position, and pulls the ignition key 22 out of the key rotor 20B. Accordingly, he can leave the vehicle after the vehicle has been held in a firmly braked state. In a state wherein the key rotor 20B is located in the "LOCK" position, the movement of the lock bar 27 from the second position to the first position is inhibited by the lock portion 25, and the shift lever 1 is non-rotatably locked in the "P" position by the shift-lever locking apparatus 10. Accordingly, if a driver keeps the ignition key 22 anywhere, it is possible to prevent any third party other than the driver from operating the shift lever 1. In the above-described embodiment, in a state wherein the key rotor 20B is located in the operating position (at an intermediate position between the "ACC" position and the "START" position), the lock portion 25 is kept out of contact with the lateral extension 28 of the lock 27. Accordingly, even if the key rotor 20B is rotated in the operating position, abrasion due to sliding contact does not occur between the lock portion 25 and the lateral extension 28. In consequence, the key rotor 20B is smoothly rotated and, in particular in automatic return of the key rotor 20B from the "START" position to the "ON" position during engine start-up, rotation of the key rotor 20B can be made smooth. In the above-described embodiment, the brim-like portion 26 is formed on the outer periphery of the ignition lock shaft 23 so as to oppose the lateral extension 28 of the lock bar 27 when the key rotor 20B is located in the operating position. However, the brim-shaped portion 26 may be omitted as occasion demands. In addition, although the above-described embodiment is arranged such that the shift lever 1 is locked in the "P" position by the shift-lever locking apparatus 10, the shift lever 1 may be locked in another non-driving position, that is, the "N" position. Referring to Fig. 8 which shows a second embodiment of the present invention, a lock bar 27A is supported on the housing 21 by means of a pin 270 and is urged by a torsion coil spring 27C in the direction in which the extension 28 of the lock bar 27A moves out of the locus of rotation of the lock-portion 25 and in one direction along the axis of the shaft 23. The control wire or connecting member 19 is connected to an intermediate portion of the lock lever 27B. Accordingly, this embodiment can achieve effects and advantages similar to those of the above-described embodiment. It is to be noted that the connecting member 19 may be arranged such that when the shift lever 1 is located in the non-driving position, a pulling force acts to move the lock bar 27 out of the locus of rotation of the lock portion 25. Furthermore, the lock bar 27 may be disposed such that it moves toward and away from the lock portion 25 and the ignition lock shaft 23 in the radial direction thereof so that the extension 28 can be moved into and away from the locus of rotation of the lock portion 25. Figs. 9 to 14 show a third embodiment of the present invention. This embodiment has a construction in which a brake pedal is interlockingly incorporated so as to reduce the operating force required to depress the pushbutton of a shift lever and to release a shift-lever lock. In this embodiment, a shift lever arresting mechanism 11A is guided by a guide plate 4A fixed to the detent plate 4 in such a manner that it can move in the direction parallel to the axis which extends between the shaft 3 and the lock recess 8. The shift lever arresting mechanism 11A is urged by its own weight in the downward direction that is, in the direction in which it approaches the shaft 3. An engagement step 113 is formed in one side of the shift lever arresting mechanism 11A so that a lower portion of the engagement step 113 is reduced in width. A holder 114 is fixed to the frame 2 on the left-hand side of the detent plate 4 as viewed in Fig. 10. A stopper member 115 is slidably supported by one end of the holder 114, and one end of the stopper member 115 projects toward the shift lever arresting mechanism 11A. A first actuator 116 and a second actuator 117 are slidably supported in the holder 114 and one end of each of the first and second actuators 116 and 117 is opposed to the other end of the stopper member 115. The stopper member 115 is urged in the direction indicated by an arrow head E by a coil spring 118, while the first actuator 116 is urged by a coil spring 119 so as to approach the stopper member 115 in the direction indicated by an arrow head F. The spring force of the coil spring 119 is selected to be sufficiently greater than that of the coil spring 118. The first actuator 116 is connected to the brake pedal 121 of a foot brake by means of a control wire 120. Accordingly, when the brake pedal 121 is applied, the first actuator 116 is, as shown in Fig.10, moved against the direction of the arrow head F against the urging force of the coil spring 119. When the application of the brake pedal 121 is released, the first actuator 116 is, as shown in Fig.11, moved in the direction of the arrow head F by the urging force of the coil spring 119. by connecting wires 122 and 123 as well as a link 124. When the lock bar 27D is rotated in the direction opposite to the arrow head D, the link 124 is rotated about a shaft 124A in the direction indicated by an arrow head G and, therefore, the second actuator 117 is, as shown in Fig.10, moved in the direction opposite to an arrow head F. When the lock bar 27D is rotated in the direction indicated by the arrow head D, the second actuator 117 is moved in the direction of the arrow head F as shown in Fig.11. As shown in Fig. 12, the lock portion 25 fixed to an intermediate portion of the key rotor shaft 23 has an inclined surface 25B formed on either of the circumferential sides, and the lock portion 25 is formed such that the cross-sectional area thereof progressively increases in the axial direction toward the facing flat surface of the brim-shaped portion 26. The lock bar 27D is urged by a spring 30A in the direction in which the extension 28 approaches the brim-shaped portion 26 that is, in the direction opposite to the arrow D. In the state shown in Figs.9 and 12 in which the lock bar 27D is biased in the direction opposite to the arrow head D by the urging force of the spring 30A, the extension 28 of the lock bar 27D is opposed to the corresponding surface of the brim-shaped portion 26 with a predetermined gap "g" formed therebetween as shown in Fig.9. When, in this state, the key rotor 20B is rotated in the direction opposite to the arrow head C, the extension 28 slides over the inclined surface 25B of the lock member 25 and engages with the lock portion 25. Thus, the lock bar 27D is moved in the direction of the arrow head D against the spring 30A as shown in Figs. 13 and 14. The operation of the arrangement described above is described hereinbelow. As shown in Fig. 10, when the shift lever 1 is located in any one of the positions other than the "p" position, for instance, the "N" position, when the key rotor 20B is located in the operating position, and when the brake pedal 121 of the foot brake is put on, the shift lever arresting mechanism 111 is biased to its lower position by its own weight. In the meantime, the first actuator 116 and the second actuator 117 are respectively biased in the direction. indicated by the arrow head F, and the stopper member 115 is biased in the direction of the arrow head E by-the urging force of the coil spring 118. In this state, the shift lever 1 can be freely operated. When, in this state, the shift lever 1 is shifted to the "p" position by rotating it in the direction opposite to the arrow head A while depressing the pushbutton 9, the detent pin 7 engages with the engagement recess 12 formed in the shift lever arresting mechanism 11A. When the depression of the pushbutton 9 is released, the detent pin 7 is moved upwardly and engages with the lock recess 8. In the meantime, the shift lever arresting mechanism 11A is, as shown in Fig. 11, moved upwardly and placed in a lock position. In this state, when the key rotor 20B is rotated from the operating position toward the "LOCK" position in the direction opposite to the arrow head C by means of the ignition key 22, the inclined surface 25B comes into contact with the extension 28 of the lock bar 27D at a position at which the key rotor 20B moves beyond the "ACC" position which is the end of the operating position. The lock bar 27D is moved in the direction of the arrow head D against the spring 30A while the projection 38 is sliding over the inclined surface 25B. Accordingly, when the connecting wires 123 and 122 are driven and thus the key rotor 20B is rotated to the "LOCK" position, the extension 28 of the lock bar 27D, as shown in Figs. 13 and 14, moves beyond the inclined surface 25B and runs onto the lock portion 25. As the lock bar 27D moves in the direction of the arrow head D, the link 124 is rotated in the direction opposite to an arrow head G and the second actuator 117 is moved in the direction of the arrow head F from the position shown in two-dot chain lines in Fig.11, and is located in a holding position shown in solid lines. Thus, the stopper member 115 is moved in the direction of the arrow head E against the coil spring 118 to engage with the engagement step 113 of the shift lever arresting mechanism 11A. The shift lever arresting mechanism 11A is held in a lock position by the stopper member 115. When the key rotor 20B is located in the "LOCK" position in this manner, the ignition key 22 can be pulled out. In this state, when the application of the brake pedal 121 is released, the first actuator 116 is moved in the direction of the arrow head F by the urging force of the coil spring 119 and is located in the holding position as shown in Fig.11. In this state, since the downward movement of the detent pin 7 is inhibited, even though the pushbutton 9 is depressed, the detent pin 7 cannot be disengaged from the lock recess 8 and the shift-lever locking apparatus 10 is locked. Thus, the shift-lever 1 is non-rotatably locked in the "P" position. In the state shown in Fig. 3, when the key rotor 20B is rotated from the "LOCK" position to the operating position by rotating the ignition key 22, the extension 28 of the lock bar 27D which has been engaged with the lock portion 25 is disengaged therefrom and thus the lock bar 27D is returned in the direction opposite to the arrow head D by the urging force of the spring 30A. As the lock bar 27D moves, the link 124 is rotated in the direction of the arrow head G, and thus the second actuator 117 is moved in the direction opposite to the arrow head F and is located in the release position shown in Fig.10. When the brake pedal 121 is depressed, the first actuator 116 is moved against the coil spring 119 in the direction opposite to the arrow head F and is located in the release position shown in Fig.10. When the two conditions that the key rotor 20B is located in the operating position and that the brake pedal 121 is applied are satisfied, the stopper member 115 is, as shown in Fig.10, moved in the direction of the arrow head E by the urging force of the coil spring 118 in interlocked relationship with the movements of the first and second actuators 116 and 117. In consequence, the stopper member 115 is disengaged from the engagement step 113 of the shift lever arresting mechanism 11A and therefore the downward movement of the shift lever arresting mechanism 11A is allowed. In this fashion, the shift-lever locking apparatus 10 is unlocked. When, in this state, the pushbutton 9 is depressed, the detent pin 7 and shift lever arresting mechanism 11A are moved downwardly and the detent pin 7 is disengaged from the lock recess 8. It is, therefore, possible to shift the shift lever 1 from the "P" position to another position. When the movable member 11A is moved to its lower position as shown in Fig. 10, one end of the stopper member 115 is brought into contact with the left-hand end of the shift lever arresting mechanism 11A and the movement of the stopper member 115 in the direction opposite to the arrow head E is inhibited, and hence the movement of the lock bar 27D in the direction of the arrow head D is inhibited. Accordingly, the extension 28 of the lock bar 27D is located in the locus of rotation of the lock portion 25, and the inclined surface 25B of the lock portion 25 is kept in contact with the extension 28 of the lock bar 27D to inhibit the rotation of the lock portion 25 in the direction opposite to the arrow head C. Accordingly, even when the key rotor 20B is to be rotated from the operating position to the "LOCK" position, the key rotor 20B cannot be rotated to the "LOCK" position, and hence the key 22 cannot be pulled out of the key rotor 20. In the above-described embodiment, even when the key rotor 20B is rotated to the operating position and the engine is started, the shift lever 1 cannot be shifted from the "P" position to another position as long as the brake pedal 121 of the foot brake is not applied. Accordingly, it is possible to prevent the occurrence that a vehicle is reversed contrary to the intention of a driver owing to the fact that the brake pedal 121 is depressed at the "R" position which the shift lever 1 will pass in the course of shifting from the "P" position to, for example, the "D" position. In the above-described embodiment, when, the key rotor 20B is rotated from the "ACC" position to the "LOCK" position, the lock bar 27D moves in parallel with the shaft 23 by virtue of the inclined surface 25B of the lock portion 25 to drive the connecting wires 123 and 122, thereby operating the second actuator 117 and the stopper member 115. Thus, the detent pin 7 is held in a locked state by the shift lever arresting mechanism 11A. While the detent pin 7 is moving from the locked state to the unlocked state, the shift lever arresting mechanism 11A also moves downwardly by its own weight with the downward movement of the detent pin 7. Accordingly, a depression load applied to the pushbutton 9 does not increase. In contrast, when an operating cable is to be driven by the downward movement force of the control pin by means of the bell crank, as in the conventional example, the operating load applied to the pushbutton 9 of the shift lever 1 may reach 1.5 to 2 times the operating load applied to the same in any one of the positions other than the "P" position. For this reason, a large force is required to depress the pushbutton 9 in the "P" position, and therefore some of people who have weak force may think that the pushbutton 9 can not be operated in the "P" position. In the third embodiment, however, if the operating force required to rotate the key rotor 28 from the "ON" position to the "START" position is represented by T [kg · cm], the key rotor 28 can be rotated from the "ACC" position to the "LOCK" position with an operating force of 0.4-0.6 T [kg · cm]. Accordingly, the key rotor 20B is rotated from the "ACC" position to the "LOCK" position to drive the connecting wires 123 and 122 with an operating force smaller than that required during engine start-up. Accordingly, an operator can operate the key rotor 20B without having an unpleasant feeling due to an increase in operating force. It is to be noted that, although the brim-shaped portion 26 is provided in the vicinity of the lock portion 25 in each of the above-described embodiments, the brim-shaped portion 26 may be formed as occasion demands. A locking apparatus for a shift lever provided for operating an automatic transmission, where if the shift lever is not located in a non-driving position such as a "P" range, a key rotor cannot be rotated to a lock position and, if the key rotor is not rotated from the lock position to an operating position, the shift lever cannot be moved from the non-driving position. An extension is interlocked with a detent pin which serves to hold the shift lever in the non-driving position. The extension is arranged to move along the axis of the key rotor in interlocked relationship with the movement of the detent pin and to move into and away from the locus of movement of a lock portion which is rotated together with the key rotor. When the extension is moved into the locus, the extension inhibits both the movement of the key rotor to the lock position and the shifting of the shift lever from the non-driving position to another position.

Claims: A shift lever locking apparatus for an automatic transmission of a vehicle, comprising a rotable lock portion (25, 26) fitted onto an ignition lock shaft (23), said lock portion being in engagement with a slidable lock bar (27) which is slidable between two positions where a shift lever (1) is arrested by a shift lever arresting mechanism (11, 11A) in a parking position when the ignition key (22) has been removed, and where a removal of said ignition key (22) is blocked in a different shift lever position characterized in that said lock portion (25, 26) is a circular segment (25) having an adjacent brim-shaped portion (26), and that said lock bar (27) is operatively connected to said shift lever arresting mechanism (11, 11A) and is slidable substantially in parallel to the axis of the ignition lock, so that a lateral extension (28) of said lock bar (27) either engages with the end surface (25B) or with a radial surface of said circular segment (25). A shift lever locking apparatus according to Claim 1 comprising detent means (7, 7A, 7B) disposed on said shift lever (1) for movement from an inhibiting position to a releasing position, said detent means (7, 7A, 7B) being moved to said shift lever (1) from said parking position to said driving position when said shift lever (1) is shifted from said driving position to said parking position, and said detent means (7, 7A, 7B) permitting the shifting of said shift lever (1) to said driving position when said detent means (7, 7A, 7B) is moved from said inhibiting position to said releasing position under the operation of the seat occupant; A shift lever locking apparatus according to Claim 1, wherein said lock bar (27) and said shift lever arresting mechanism (11, 11A) form an interlocking means interposed between a detent pin (7) of said shift lever (1) and said lock portion (25, 26). An apparatus according to Claim 1, wherein when said shift lever (1) is shifted to said parking position to cause said detent means (7, 7A, 7B) to move to said inhibiting position, said lock bar (27) projects into the locus of movement of said lock portion (25, 26) by virtue of a driving force derived from the movement of said lock portion (25, 26). An apparatus according to Claim 1, wherein said lock bar (27) is urged by a spring (30, 27C, 30A) in the direction in which said lock bar (27) comes away from the locus of movement of said lock portion (25, 26). An apparatus according to Claim 1, wherein said interlocking means has an intermediate portion constituted by a wire cable (19, 123), one end of said wire cable being connected to said lock bar (27) which moves into and out of the locus of movement of said lock portion (25, 26). An apparatus according to Claim 1, wherein when said ignition key (22) is rotated from said lock position to said operating position and when a brake pedal (121) of said vehicle is applied, said interlocking means enables said detent means (7, 7A, 7B) to move from said inhibiting position to said releasing position. An apparatus according to Claim 7, wherein said shift lever arresting mechanism (11, 17) being arranged to engage with said detent means (7, 7A, 7B) to locate said ignition key (22) in said operating position when said shift lever (1f) has moved to said parking position, while only when said brake pedal (121) is applied, said shift lever arresting mechanism (11, 11A) can be moved from said inhibiting position to said releasing position. An apparatus according to Claim 8 further including a stopper member (115) allowing said shift lever arresting mechanism (11, 11A) be moved from said inhibiting position to said releasing position only when said ignition key (22) is placed in said operating position and when said brake pedal (121) is applied. An apparatus according to Claim 9, wherein said stopper member (115) and said shift lever arresting mechanism (11, 11A) respectively have engagement portions which engage with each other at said inhibiting position of said detent means (7, 7A, 7B) so as to inhibit said detent means (7, 7A, 7B) from moving to said releasing position. An apparatus according to Claim 10 further including urging means (118) for urging said stopper member (105) in the direction away from said shift level arresting mechanism (11, 11A). An apparatus according to Claim 11, further including a first actuator (11A) disposed in correspondence with said stopper member (115), when said ignition key (22) is located in said operating position, said first actuator (117) pressing said stopper member (115) in the direction in which said stopper member (115) holds said shift lever arresting mechanism (11, 11A) in said inhibiting position, while when said ignition key (22) is rotated to said lock position, said first actuator (117) moves away from said stopper member (115). An apparatus according to Claim 11 further including a second actuator coupled to the brake pedal (121) of said vehicle, when said brake pedal is not applied, said second actuator (116) pressing said stopper member in the direction in which said stopper member (115) holds said shift lever arresting mechanism (11, 11A) in said inhibiting position, while when said brake pedal (121) is applied, said second actuator (116) moves away from said stopper member (115). A locking apparatus according to Claim 1, wherein said lock bar (27) is urged in the direction in which said lateral extention (28) is moved along the axis of said shaft and inserted into the locus of movement of said lock portion (25, 26). An apparatus to Claim 1, wherein said extension is forcibly moved in one direction against a spring (30A) by means of an inclined surface (25B) formed on said lock portion (25, 26).

Inventors: ICHIHARA, ISAO TOYOTA JIDOSHA KABUSHIKI KAISHA, ISHIGAMI, NARUMI K. K. TOKAI-RIKA-DENKI-SEISAKUSHO, MIYOSHI, SHIGETOSHI TOYOTA JIDOSHA KABUSHIKI K., NAKAMURA, SYUZI TOYOTA JIDOSHA KABUSHIKI KAISHA
Applicants: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
Application year: 1988
Main classification: F16H61
IPC codes: F16H61, B60R25, F16H59