Safety latch for a vehicle storage compartment

Abstract: In a push-open type storing device for use in an automobile which enables a storing box to be locked in the shut position inside a housing in spite of the biasing spring pressure owing to the operation of a cam member (1) on the housing side and a pin member (P) on the storing box side and further enables the storing box to be automatically moved in the opening direction out of the housing through the opening thereof in response to a further push given to the storing box, the storing device with a safety function produced by forming a locking part (4) and an outlet mouth (5) as separated with a distance from each other on one edge side defining a cam groove (2) of the cam member (1), integrally forming a projecting stopper guide wall (6) between the locking part (4) and the outlet mouth (5) on the other edge side opposite the one edge side mentioned above, and allowing the locking part (4) for securing the pin member (P) to be positioned outwardly from the stopper guide wall (6), enables the pin member to collide against the outer edge (6a) of the stopper guide wall (6) and prevents the storing box from being thrust out of the housing when the storing device is exposed to a large inertial force.

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention: This invention relates to a so-called push-open type storage device, and particularly to a storing device furnished with a safety function, to be installed as in an instrument panel of an automobile. 2. Description of the Prior Art: Generally, a conventional push-open type storing device of this sort comprises a storing box openably supported in a housing which is provided on an instrument panel side and constantly kept biased in the opening direction thereof by virtue of the pressure of a spring, a cam member provided therein with a cam groove which has an inlet mouth, a locking part and an outlet mouth and rotatably set in place on the housing side, and a pin member adapted to move inside the cam groove of the cam member and set in place on the storing box side. Owing to the construction thereof described above, the conventional device allows the storing box to lock itself in the shutting position thereof inside the housing in spite of the biasing spring pressure by bringing the pin member into engagement with the locking part of the cam groove and then allows the storing box in the locked state to move automatically in the opening direction through the opening part of the housing by pushing the storing box farther inside the housing to thereby release the pin member from the engagement with the locking part of the cam groove. As illustrated in FIG. 7 and FIG. 8, a cam member 21 used in the conventional device is rotatably kept in place on a shaft 27 on the housing side through a torsion spring 28 and is constantly kept biased in one prescribed direction by the pressure of the torsion spring 28 until it is restrained by a restraining wall 29. Specifically, this cam member 21 is so constructed as to have integrally incorporated therein on one edge side thereof defining its cam groove 22 a locking part 24 and an outlet mouth 25 which are in an extremely approximated state and on the other edge side thereof opposite the aforementioned one edge side a guide wall 26 for a pin member P . The cam member 21 constructed as described above has been developed exclusively for the purpose of guiding the pin member P in the direction of the outlet mouth 25 by virtue of the function of an inner edge 26a of the guide wall 26. Therefore, the guide wall 26 is so formed that the leading terminal thereof will protrude outward as compared with the position of the locking part 24, namely thrust out in the direction of an inlet mouth 23 of the cam groove 22. In other words, the locking part 24 for securing the pin member P is disposed on the inner side from the leading terminal of the guide wall 26. When the storing box is pushed into the housing, therefore, the pin member P disposed on the rear terminal side of the storing box collides against an outer guide surface 21a of the cam member 21, rotates the cam member 21 and reaches the inlet mouth 23 of the cam groove 22. When the pin member P collides against the guide wall 26 of the cam member 21, then the cam member 21 is slightly rotated in the biasing direction by the pressure of the torsion spring 28 and the pin member P is guided into the cam groove 22 and, as a result, the storing box is retracted by the biasing spring pressure. Thus, the pin member P is automatically brought into engagement with the locking part 24 positioned inside the cam groove 22 and locks the storing box infallibly at the shut position inside the housing in spite of the biasing spring pressure as illustrated in FIG. 7. When the storing box in the locked state is pushed farther into the housing, the pin member P departs from the locking part 24 of the cam groove 22, collides against the inner edge 26a of the guide wall 26 and allows the cam member 21 to be rotated further in the biasing direction (the unlocking direction) as illustrated in FIG. 8. When the storing box is subsequently relieved of this pushing motion, the pin member P is guided in the direction of the outlet mouth 25 of the cam groove 22 and enabled to depart automatically from the cam groove 22 of the cam member 21 and, as a result, the storing box is caused by virtue of the biasing spring pressure to move automatically from the opening part of the housing in the opening direction. When the storing box which is locked in the shut position thereof with the pin member P kept in engagement with the locking part 24 is exposed to a large inertial force to be generated when the automobile is brought to a sudden stop because of collision or application of brakes, the storing box is moved in the same direction as the direction of inertia. At this time, the pin member P , synchronously with the motion of the storing box and in the same manner as in the open state illustrated in FIG. 8, departs from the locking part 24 and allows the cam member 21 to rotate in the unlocking direction. This fact opens up the possibility of the storing box being accidentally moved through the opening part of the housing in the opening direction by the biasing spring pressure and inflicting damage on the occupant of the automobile. In recent years, therefore, the practice of furnishing the push-open type storing device in particular with a safety function for the prevention of this accident has become an obligatory measure. Such a storing device furnished with a safety function is disclosed in Japanese Utility Model Public Disclosure No. 2-25332 and in US-A-4 635 763, for example. This prior art storing device furnished with the safety function, though omitted from illustration herein, comprises a guide piece integrally extended from the rear terminal part of a cam member similar in shape to the conventional cam member 21 described above, an inertia-responding member slidably disposed on the guide piece, a tension spring adapted to draw the inertia-responding member in the direction of the rear terminal part of the cam member, and a lock cylinder adapted to allow entry therein of the terminal part of the inertia-responding member and formed in the relevant part of the housing. Therefore, the prior art device is used similarly in the normal service to the conventional push-open type storing device. When the storing box which is kept locked in its shut position is exposed to a large inertial force as when the automobile is brought to a sudden stop by collision or application of brakes, therefore, this device operates so that the terminal part of the inertia-responding member disposed on the guide piece of the cam member thrusts into the lock cylinder in spite of the drawing force of the tension spring and inhibits the cam member from rotating in the unlocking direction and, as a result, prevents the storing box from thrusting out of the housing through the opening part thereof. The prior art storing device furnished with the safety function not only necessitates incorporation therein as an extra component of the inertia-responding member separately of the cam member but also requires the guide piece to be integrally extended from the rear terminal part of the cam member, the inertia-responding member to be disposed on the guide piece as vested with the drawing force of the tension spring, and the lock cylinder to be formed separately on the housing side as adapted to allow entry therein of the terminal part of the inertia-responding member. This construction, therefore, automatically entails an increase in the number of component parts and an uncalled-for addition to the cost, complexity, and size of the storing device and suffers consequently from the serious problem of increasing the number of works involved in the assembly and jeopardizing the efficiency of the operation of assembly. The prior art storing device further has the possibility of lacking reliability of performance because of the undeniable phenomenon that when the unlocking stroke of the storing box is short, the cam member rotates in the unlocking direction and accidentally thrusts the storing box outside before the inertia-responding member begins to move on the guide piece. In the light of the problems encountered by the prior art storing device furnished with the safety function and intended for use in an automobile as described above, the major object of this invention is to provide a storing device for use in an automobile which infallibly manifests a safety function without necessitating use of an independent part intended exclusively for that purpose. SUMMARY OF THE INVENTION To accomplish the object, according to this invention there is provided a storing device according to claim 1. The above and other objects, characteristic features and advantages of the present invention will become more apparent to those skilled in the art from the detailed description of the present invention given hereinbelow with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view illustrating the essential part of a storing device furnished with a safety function as one embodiment of this invention. FIG. 2 is an explanatory view illustrating the initial state of the storing device with a storing box into a housing. FIG. 3 is an explanatory view illustrating the state of the storing device having a pin member secured in a locking part of a cam member. FIG. 4 is an explanatory view illustrating the state of the storing device with the pin member released from the locking part of the cam member. FIG. 5 is a cross section illustrating the essential part of the storing device in the state in which the storing box has been moved in the opening direction. FIG. 6 is an explanatory view illustrating the state of the storing device in which the safety function has been fulfilled. FIG. 7 is an explanatory view illustrating the state of a prior art storing device with a pin member secured in a locking part of a cam member. FIG. 8 is an explanatory view illustrating the state of the prior art storing device with the pin member released from the locking part of the cam member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The present invention will now be described in detail below with reference to one embodiment thereof illustrated in the drawings. The storing device furnished with the safety function and intended for use in an automobile as contemplated by the present invention comprises a storing box B openably supported pivotally in a housing H provided on an instrument panel side and constantly kept biased in the opening direction thereof by virtue of the pressure of a spring 12, a cam member 1 rotatably set in place on the housing side, and a pin member P adapted to move inside a cam groove 2 of the cam member 1 and set in place on the storing box side. Owing to the construction described above, the storing device of this invention allows the storing box B to lock itself in the shut position thereof inside the housing H in spite of the biasing spring pressure by bringing the pin member P into engagement with a locking part 4 of the cam groove 2 and then allows the storing box B in the locked state to move automatically in the opening direction through an opening part of the housing H by pushing the storing box B further inside the housing H to thereby releasing the pin member P from the engagement with the locking part 4 of the cam groove 2. The present invention, unlike the prior art storing device which manifests the safety function by the use of an inertia-responding member and an accessorial part thereof formed separately of the cam member, has been developed on the basis of a new concept of manifesting the safety function by imparting an alteration to the cam member 1. To be more specific, the cam member 1 used in this embodiment is an integrally formed article of synthetic resin. As illustrated in FIG. 1, the cam member 1 is provided therein with the cam groove 2 having an inlet mouth 3, the locking part 4 and an outlet mouth 5, supported rotatably on a shaft 7 on the housing H side through a torsion spring 8 and a washer 9, and kept biased constantly in a given direction by the pressure of the torsion spring 8. This cam member 1 is characterized in that the locking part 4 and the outlet mouth 5 are formed as separated with an appreciable distance from each other on one edge side defining the cam groove 2, that a projecting stopper guide wall 6 shaped approximately like the letter V is formed integrally between the locking part 4 and the outlet mouth 5 on the other edge side opposite the aforementioned one edge side, and that the locking part 4 for securing the pin member P is positioned outwardly from the leading terminal part of the stopper guide wall 6. In this embodiment, owing to the positional relation described above, the gap which occurs between the leading terminal part of the stopper guide wall 6 and the one edge of the cam groove 2 during the normal opening operation allows the pin member P to be moved in the direction of the outlet mouth 5 of the cam groove 2 and the inertial force, when exerted on the storing device, causes the pin member P to collide against an outer edge 6a of the stopper guide wall 6 and inhibits the pin member P from moving in the direction of the outlet mouth 5 of the cam groove 2. In FIG. 1, reference numeral 10 stands for a regulating wall which serves the purpose of regulating the position at which the cam member 1 is urged into a rotation, numeral 11 for a securing wall which cooperates with an arm part 1b of the cam member 1 to secure in position the terminal part of the torsion spring 8, and numeral 12 for a constant pressure spring for biasing the storing box B in its opening direction at all times. The constant pressure spring 12 is wound on a winding shaft 13, which is fixed to the rear terminal end of the storing box B via a retaining part 14, so that the free end 12a of the spring 12 to be fixed to the bottom surface of the housing H in the vicinity of its opening part with a bolt or the like fastening means is retreated toward the winding shaft 13. In the normal use of the storing device constructed as described above, therefore, when the storing box B is pushed into the housing H against the biasing force of the constant pressure spring 12, the pin member P formed on the rear terminal part side of the storing box B collides against an outer guide surface 1a of the cam member 1 as illustrated in FIG. 2 and advances while rotating the cam member 1 in spite of the pressure of the torsion spring 8 and eventually reaches the inlet mouth 3 of the cam groove 2. As a result, the cam member 1 is now rotated slightly in the biasing direction by the pressure of the torsion spring 8 and the pin member P is consequently guided into the cam groove 2. At this time, since the storing box B is slightly retracted similarly by the biasing force of the constant pressure spring 12, the pin member P is automatically engaged with the locking part 4 of the cam groove 2 as shown in FIG. 3 owing to the positional relation mentioned above and locks the storing box B infallibly at the shut position inside the housing H against the biasing force of the constant pressure spring 12. When the storing box B in the locked state is further pushed into the housing H , the pin member P releases itself from the locking part 4 of the cam groove 2 as shown in FIG. 4 and rotates the cam member 1 further in the biasing direction (the unlocking direction). When the pushing action on the storing box B is discontinued, the pin member P follows the same path as in the case of the prior art device, passes through the outlet mouth 5, and releases itself automatically from the cam groove 2 of the cam member 1 as shown in FIG. 5. As a result, the storing box B is enabled to automatically move in the opening direction through the opening part of the housing H by virtue of the biasing force of the constant pressure spring 12. When the storing box B remaining in the locked state at the shut position thereof is exposed to a large inertial force G (FIG. 6) when the automobile is brought to a sudden stop by collision or application of brakes, the pin member P is moved in conjunction with the storing box B in the same direction as the direction of the inertial force similarly to that in the prior art storing device. At this time, the pin member P is caused to collide instantaneously against the outer edge 6a of the stopper guide wall 6 and infallibly inhibited from moving in the direction of the outlet mouth 5 of the cam groove 2. As a result, the cam member 1 is completely prevented from rotating in the unlocking direction and the storing box B is retained in the shut position inside the housing H and the possibility of the storing box B accidentally thrusting out of the housing H is eliminated. Specifically in the light of the fact that, during the normal opening operation, the cam member 1 is caused to rotate in the unlocking direction and the pin member P is allowed to move in the direction of the outlet mouth 5 of the cam groove 2 and, on exposure of the storing device to a sudden inertial force G , the speed of motion of the pin member P exceeds the speed of rotation of the cam member 1 in the unlocking direction, the present embodiment has succeeded in enabling the storing device to manifest a necessary safety function simply by adopting an extremely simple construction of forming the stopper guide wall 6 on the edge side defining the cam groove 2 and causing the locking part 4 to be positioned outwardly from the stopper guide wall 6. When the inertial force G mentioned above ceases to exist, the storing box B is moved to the formerly occupied position by virtue of the biasing force of the constant pressure spring 12. At this time, the pin member P is guided by the outer edge 6a of the stopper guide wall 6, led to the locking part 4 positioned more outwardly than the stopper guide wall 6, and brought into engagement automatically with the locking part 4. As a result, the cam member 1 is prevented from being rotated in the unlocking direction and the storing box B is retained at the shut position inside the housing H . The embodiment described thus far represents a case in which the storing box B is adapted to be opened and shut linearly relative to the housing H . This invention is not limited to this particular type of the storing box. It goes without saying that this invention can be easily applied without departing from the spirit of this invention to a rotary storing box which is opened by being rotated downwardly and shut by being rotated upwardly, for example. As described above, the present invention allows the push-open type storing device thereof to manifest the safety function to the literally fully extent by simply imparting an alteration to the cam member unlike the prior art storing device which is furnished with the safety function relying on the use of an inertia-responding member and an accessorial part thereof. Thus, the storing device of this invention has absolutely no use for a special part adapted exclusively to manifest the safety function under discussion. This invention, therefore, contributes in a great measure to simplification and miniaturization of the storing device, consequently allows a decrease in the number of works involved in the assembly of the storing device, and therefore contributes to lowering the cost of the storing device. Further, the construction of causing the pin member to collide against the outer edge of the stopper guide wall of the cam member during the presence of the inertial force ensures infallible prevention of the cam member from being rotated in the unlocking direction. Thus, the storing device of this invention enjoys notable improvement in the reliability of performance as compared with the prior art storing device.

Claims: A storing device with a safety function and for use in an automobile, comprising a storing box (B) openably supported in a housing having an opening; a constant pressure spring (12) provided between said storing box (B) and the housing (H) for constantly biasing said storing box (B) in an opening direction; a cam member (1) rotatably set in place on the housing side and provided on an outside thereof with a guide surface and on an inside thereof with a cam groove (2) which has an inlet mouth (3), a locking part (4) and outlet mouth (5); and a pin member (P) set in place on the storing box side for moving along said guide surface of said cam member, entering said inlet mouth of said cam groove and engaging with said locking part (4) of said cam groove (2) to lock said storing box (B) in a shut position inside the housing (H) against the biasing force of said spring (12) when a first pushing force is applied to said storing box and for moving inside said cam groove to be released from the engagement with said locking part (4) of said cam groove (2) and brought to said outlet mouth of said cam groove, thereby moving said storing box (B) automatically in the opening direction through the opening of the housing when a second pushing force is applied for moving said locked storing box further into the housing (H); said locking part (4) and said outlet mouth (5) of said cam groove (2) being formed separated a distance from each other on one edge side of said cam member defining said cam groove (2); the other edge side of said cam member (1) opposite the one edge side thereof being provided integrally with a projecting stopper guide wall (6) at a position between said locking part (4) and said outlet mouth (5) of said cam groove (2) so that said locking part (4) of said cam groove (2) is positioned outwardly from said stopper guide wall (6) of said cam member (1); whereby said pin member (P) is enabled to collide against an outer edge (6a) of said stopper guide wall (6) of said cam member and prevent said storing box (B) from being thrust out of the housing when the storing device is exposed to a large inertial force, the cam member (1) being supported rotatably on a shaft (7) on the housing (H) side through a torsion spring (8) and a washer (9) and kept biased constantly in a given direction by the pressure of the torsion spring (8); the terminal part of the torsion spring (8) being secured in position by cooperation with an arm part (1b) of the cam member (1) guiding pin member (P) consequently in and out of the cam groove (2).

Inventors: ASANO KAZUNORI, ASANO, KAZUNORI
Applicants: KATO HATSUJO KAISHA LTD, KATO HATSUJO KAISHA LTD.
Application year: 1993
Main classification: B60R7
IPC codes: B60R7, E05B65, E05C19