Child protecting mechanism in door lock apparatus

Abstract: A child protecting mechanism in a door lock apparatus includes a base (1) internally accommodating an opening/closing mechanism, an opening lever (4) pivotally supported on the base (1) for actuating the opening/closing mechanism, an inside lever (10) and a child protecting lever (13) pivotally supported on the base (1), and an opening lift lever (16) having one end connected to the inside lever (10) and another end connected to the child protecting lever (13) and capable of being engaged with and disengaged-from the opening lever (4). Turning the child protecting lever (13) causes the opening lift lever (16) to rock to disengage the opening lever (4) and the opening lift lever (16), thereby preventing the turning motion of the inside lever (10) from being transmitted to the opening lever (4).

Description: This invention relates to a child protecting mechanism in a door lock apparatus for an automotive vehicle. A known child protecting mechanism of this kind is as disclosed in the specification of Japanese Utility Model Application Laid-Open (KOKAI) No. 55-49403. This prior-art child protecting mechanism includes a base, an opening lever for actuating an opening/closing mechanism, an inside lever connected to an inside handle, an opening lift lever for transmitting the turning motion to the opening lever to turn the opening lever, and a child protecting lever for preventing the turning motion of the inside lever from being transmitted to the opening lever, with the opening lever, opening lift lever and child protecting lever being pivotally supported on the base. The opening lift lever is capable of being engaged with the opening lever, and is capable of being engaged also with the inside lever and child protecting lever via the same slide pin. By turning the child protecting lever, the slide pin is caused to slide to disengage the inside lever and the opening lift lever, thereby placing the inside lever in a freely swinging state and establishing a locked condition. This conventional child protecting mechanism involves certain shortcomings. Specifically, since sliding the slide pin engages and disengages the inside lever and the opening lift lever to render the turning motion of the inside lever transmittable or non-transmittable to the opening lever, namely to establish the unlocked or locked state, a change with the passage of time and the intrusion of sand and dust or the like can detract from the slidability of the slide pin. Consequently, a larger force is required to manipulate the child protecting lever, and there is the danger that the child protecting lever may become inoperable. In addition, the mechanism has a large number of component parts, assembly is difficult and costs are high. According to document US-A 3,923,329 there is disclosed a child protecting mechanism in a door lock apparatus comprising a base internally accommodating a door lock and unlock mechanism, an opening lever pivotally supported on the base for actuating the mechanism, an inside lever pivotally supported on the base, a child protecting lever being pivotally supported on the base and being provided to interrupt the transmission of movement of the inside lever to the opening lever, and an opening lift lever for transmitting a turning motion of the inside lever to the opening lever. This generic child protecting mechanism is further constituted in that by means of the child protecting lever a pin is shiftable in a position for transmitting a turning motion of the inside lever to the opening lift lever which is always in an engagement position with respect to the opening lever. Therefore, the interruption of the opening moving motion is made between the inside lever and the opening lift lever. The object of the present invention is to provide a simplified child protecting mechanism in which the manipulating force is minimized. This object is achieved by means of a child protecting mechanism according to claim 1 in which the opening lift lever has one end portion always connected to the inside lever via a pin for transmitting a turning motion of the inside lever to the opening lift lever and wherein a part of the child protecting lever is in a sliding engagement with the other end portion of the opening lift lever so that when the child protecting lever is bifurcated, the opening lift lever is shiftable for preventing its moving motion caused by the turning motion of the inside lever from being transmitted to the opening lever. In operation, the turning of the child protecting lever causes the opening lift lever to rock and thus to disengage from the opening lever, thereby preventing the turning motion of the inside lever from being transmitted to the opening lever. Thus, owing to the rocking action of the opening lift lever, the opening lever and the opening lift lever are brought into engaged and disengaged state to establish the unlocked or locked state. As a result, the portions for changing over between the engaged and disengaged state undergo little change with time, there is no longer an increase in the force necessary to manipulate the child protecting lever and there is no danger of the child protecting lever becoming inoperable. In addition, dispensing with the slide pin makes it possible to simplify the apparatus and lower cost. Preferred embodiments of the invention are defined in the claims 2 to 4. Other features and advantages of the present invention will be apparent from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof. Fig. 1 is a plan view showing a door lock apparatus according to the present invention; Fig. 2 is a side view of the apparatus shown in Fig. 1; Fig. 3 is a plan view showing a child protecting mechanism in an unlocked state; Fig. 4 is a plan view showing an inside lever in Fig. 3 after the lever has been turned; Fig. 5 is a plan view showing the child protecting mechanism in the locked state; and Fig. 6 is a plan view an inside lever in Fig. 5 after the lever has been turned. An embodiment of the present invention will now be described in detail with reference to the accompanying drawings. As shown in Fig. 1 illustrating a child protecting mechanism in door lock apparatus for an automotive vehicle, a lift lever 2 for actuating an opening/closing mechanism (not shown) is pivotally supported by a pivot pin 3 on a base internally accommodating the opening/closing mechanism, which comprises a pawl and a latch. An opening lever 4 is pivotally supported on the pivot shaft 3 and is urged clockwise in Fig. 1 at all times by a spring 5. A slide member 6 having a pin 6a erected thereon is slidably retained on one end 4a of the opening lever 4. The pin 6a is capable of being engaged with one end 2a of the lift lever 2. A locking lever 7 connected to a locking knob (not shown) is pivotally supported by a spring 8 on an upstanding portion 1a of the base 1 so as to capable of turning to a limited extent. One end 7a of the locking lever 7 is formed to include an oblong hole 9 defining a circular arc whose center is the pivot pin 3. The pin 6a is mated with the oblong hole 6a. As shown in Figs. 1 and 2, an inside lever 10 connected to an inside handle (not shown) is pivotally supported by a pivot pin 11 on the upstanding portion 1a on the upper side of the vehicle (the upper side in Fig. 2). A pin 12 is implanted in one end 10a of the inside lever 10. A child protecting lever 13 formed to have a handle portion 13a is pivotally supported by a pivot pin 14 on the upstanding portion 1a on the lower side of the vehicle (the lower side in Fig. 2). One end portion 13b of the child protecting lever 13 is formed to have a pin 15. An opening lift lever 16 is disposed between the inside lever 10 and the child protecting lever 13. One end 16a of the opening lift lever 16 is formed to have an oblong hole 17 defining a circular arc whose center is the pivot pin 11. The pin 12 is mated with the oblong hole 17. The latter is utilized for initial play when the inside lever 10 is manipulated. In a case where it is unnecessary to set play, the oblong hole 17 may be dispensed with and the pin 12 may be connected directly to the opening lift lever 16. Further, another end 16b of the opening lift lever 16 is formed to have a bifurcated portion 18 with which the pin 15 is engaged. The opening lift lever 16 is formed to have an engaging portion 19 capable of engaging with the other end 4b of the opening lever 4. It is possible to adopt an arrangement in which the bifurcated portion 18 is replaced by an oblong hole. The operation of the apparatus will now be described. When, in the state shown in Fig. 1, the inside handle is manipulated to turn the inside lever 10 counter-clockwise in Fig. 2, the opening lift lever 16 is shifted from the position indicated by the solid line in Fig. 2 to the position indicated by the two-dot chain line in Fig. 2 (i.e., a transition is made from the state of Fig. 3 to the state of Fig. 4) . Owing to this movement of the opening lift lever 16, the engaging portion 19 and the other end 4b of the opening lever 4 engage and the opening lever 4 turns counter-clockwise in Fig. 1 against the biasing force of the spring 5. Owing to the turning motion of the opening lever 4, the pin 6a of the slide member 6 and the end 2a of the lift lever 2 engage, thereby turning the lift lever 2 to actuate the opening/closing mechanism. As a result, the vehicle door (not shown) opens. Further, when the locking knob is actuated in the state of Fig. 1 to turn the locking lever 7 clockwise in Fig. 2, the slide member 6 is shifted from the position indicated by the solid line in Fig. 1 to the position indicated by the two-dot chain line in Fig. 1 due to engagement between the oblong hole 9 of the locking lever 7 and the pin 6a of the slide member 6. Owing to sliding of the slide member 6, the pin 6a of the slide member 6 and the end 2a of the lift lever 2 are no longer in an engageable state, or in other words, the locked state is attained in which the turning motion of the opening lever 4 is prevented from being transmitted to the lift lever 2. As a result, the door will not open even if the inside handle is manipulated. Furthermore, when the handle 13a is manipulated in the state of Fig. 1 to turn the child protecting handle 13 clockwise in Fig. 2, the opening lift lever 16 is rocked about the pin 15 from the position of the solid line in Fig. 2 to the position of the two-dot chain line in Fig. 2 (i.e., a transition is made from the state of Fig. 3 to the state of Fig. 5). Owing to this rocking motion, the engaging portion 19 of the opening lift lever 16 and the other end 4b of the opening lever 4 are no longer in an engageable state, or in other words, the locked state is attained in which the turning motion of the opening lift lever 16 is prevented from being transmitted to the opening lever 4. As a result, even if the inside lever 10 is turned, it performs no meaningful action and the door will not open, irrespective of the state of the locking lever 7. Thus, by shifting the opening lift lever 16, the engaging portion 19 of the opening lift lever 16 and the end 4a of the opening lever 4 are engaged or disengaged, whereby the locked or unlocked state is attained. Consequently, the portions for changing over between the engaged and disengaged state between the engaging portion 19 of the opening lift lever and the other end 4b of the opening lever 4 undergo merely little change with time, so that there is no longer an increase in the force necessary to manipulate the child protecting lever 13 and there is no danger of the child protecting lever 13 becoming inoperable. In addition, dispensing with the conventional slide pin used according to the generic mechanism the invention makes it possible to simplify the apparatus and lower cost owing to a reduction in the number of component parts. Furthermore, the inside lever 10, the opening lift lever 16 and the child protecting lever 13 can be disposed in space-apart relation, and therefore the locking lever 7 can be disposed on the lower side of the vehicle (the lower side in Fig. 2). As a result, the opening lever 4 and the locking lever 7 can be functionally connected together directly without the intermediary of a locking rod. This makes it possible to simplify the apparatus and lower its cost by reducing the number of component parts.

Claims: A child protecting mechanism in a door lock apparatus, comprising: a base (1) internally accommodating a door lock and unlock mechanism (2, 7); an opening lever (4) pivotally supported on said base (1) for actuating said mechanism (2, 7); an inside lever (10) pivotally supported on said base (1); a child protecting lever (13) being provided to interrupt the transmission of movement of the inside lever (10) to the opening lever (4); an opening lift lever (16) having one end portion always connected to said inside lever (10) via a pin (12) for transmitting a turning motion of said inside lever to said opening lift lever, wherein said child protecting lever (13) is pivotally supported on said base (1) and a part of said child protecting lever is in sliding engagement with the other end portion of said opening lift lever (16), so that when said child protecting lever (13) is rotated said opening lift lever (16) is shiftable for preventing its moving motion caused by the turning motion of said inside lever (10) from being transmitted to said opening lever (4). A child protecting mechanism according to claim 1, characterized in that said pin (12) is secured to said inside lever (10) and is extended into an oblong hole (17) formed in said one end portion of said opening lift lever (16). A child protecting mechanism according to claim 1, characterized in that the portion at the other end of said opening lift lever (16) is in the form of a bifurcated portion. A child protecting mechanism according to claim 1, characterized in that said pin (12) is connected to both said inside lever (10) and said one end portion of said opening lift lever (16) so as to permit a relative movement therebetween.

Inventors: FUKUMOTO RYOICHI, HAYAKAWA SHIGERU, OKUDAIRA SOICHIRO, SHIMIZU YOSHIHIRO, FUKUMOTO, RYOICHI, HAYAKAWA, SHIGERU, OKUDAIRA, SOICHIRO, SHIMIZU, YOSHIHIRO
Applicants: AISIN SEIKI, AISIN SEIKI KABUSHIKI KAISHA
Application year: 1990
Main classification: E05B65
IPC codes: E05B65