JP2004031656A - Cap locking mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap locking mechanism that can surely lock a cap and, in addition, can be manufactured by using a mold having a simple structure. <P>SOLUTION: This cap locking mechanism 1 locks the cap 3 attached to a case 2 so that the cap 3 may be rotated around its one end side in a closed state by inserting a columnar projection 32 protruded from the surface of the cap 3 facing the case 2 on the other end side of the cap 3 into the inserting hole 24 of the case 2. The columnar projection 32 is formed to be protruded straightly against the facing surface and, at the same time, to have a uniform cross-sectional form over the full length in the direction perpendicular to its protruded direction. The inserting hole 24 is formed straight and, at the same time, to have a uniform cross-sectional form over the full length in the direction perpendicular to its depthwise direction. The projection 32 and the hole 24 are constituted so that the port margin of the hole 24 and the external surface of the projection 32 or the internal surface of the hole 24 and the front end section of the projection 32 may interfere with each other in an intermediate state between the closed state and opened state. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lid locking mechanism rotatably attached to a case.
[0002]
[Prior art]
As a locking mechanism for this type of lid, a locking mechanism for the lid shown in FIG. 6 has been conventionally known. In the lid locking mechanism 51, a lid 53 rotatably attached to the case 52 with one end as a fulcrum (specifically, with a rotation axis L provided at one end as a fulcrum) is in a closed state. In the state (B in the drawing), it is possible to prevent the lid 53 from being unintentionally shifted to the open state due to vibration or the like, and the other end of the lid 53 (the free end side). ) Includes a hook piece 54 protruding from a surface (a lower surface in the figure) facing the case 52 and a locking groove 55 provided in the case 52. In this case, the hook piece 54 is formed on the lower surface on the other end side of the lid 53 so as to protrude downward at a substantially right angle at a substantially right angle, and the tip of the columnar projection 54a facing the case 52 in the closed state. And a locking claw 54b protruding from the surface of the device. The hook piece 54 is formed integrally with the lid 53 by resin molding. On the other hand, the locking groove 55 is formed at a portion of the wall 52a of the case 52 facing the hook piece 54 and facing the locking claw 54b when the lid 53 is closed.
[0003]
In the lid locking mechanism 51, when the lid 53 in the open state (position A in FIG. 6) is rotated toward the closed state, the locking claw 54b of the hook piece 54 is At this time, the hook piece 54 moves downward along the inner surface 52a while the columnar projection 54b is elastically deformed, and the locking claw 54b enters the locking groove 55. In this state, since the locking claw 54b and the locking groove 55 are engaged with each other, even if vibration or the like is applied to the case 52, the lid 53 in the closed state (closed state) is unintentionally opened. Migration can be prevented. On the other hand, when shifting (opening) the lid 53 in the closed state to the open state, an external force is applied to the lid 53 from the other end to the one end (the direction of the arrow in the drawing). At this time, the lid 53 is elastically deformed and the engagement state between the locking claw 54b and the locking groove 55 is released. As a result, the lid 53 shifts to the open state.
[0004]
[Problems to be solved by the invention]
However, the conventional lid locking mechanism 51 has the following problems. That is, in the conventional lid lock mechanism 51, the hook piece 54 is engaged with the locking groove 55 by providing the hook piece 54 integrally with the lid 53 and the locking groove 55 in the case 52. This prevents the lid 53 from being unintentionally shifted to the open state. In this case, in order to manufacture the hook pieces 54 and the case 52, it is necessary to manufacture the locking claws 54b and the locking grooves 55 by so-called undercut. For this reason, when the lid 53 integrally provided with the hook pieces 54 and the case 52 provided with the locking grooves 55 are resin-molded, a die used for these moldings is pressed and cut off, a slide mechanism, and / or a mold. There is a problem in that a down pin must be used and the mold structure becomes complicated. In addition, molds having these complicated structures generally have low durability and are expensive, so that it is preferable that the mold structure can be simplified.
[0005]
The present invention has been made in view of such a problem, and has as its main object to provide a lid locking mechanism that can securely lock the lid and that can be manufactured with a mold having a simple structure.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the lid locking mechanism according to claim 1 is provided on the other end of the lid rotatably attached to the case with one end as a fulcrum, and protrudes from the other surface of the lid facing the case. A lock mechanism for a lid that locks the lid in a closed state by inserting the columnar projection into an insertion hole provided in the case, wherein the columnar projection protrudes straight with respect to the facing surface. And the shape of the cross section orthogonal to the protruding direction is formed uniformly over the entire length, and the insertion hole is formed straight and the shape of the cross section orthogonal to the depth direction extends over the entire length. The columnar projection and the insertion hole are uniformly formed, and in an intermediate state between the closed state and the open state, the rim of the insertion hole and the outer surface of the columnar projection, or the inner surface of the insertion hole and the columnar shape. The tip of the projection Are each configured to interfere are.
[0007]
In the lock mechanism for a lid according to claim 2, the case is provided with a columnar projection protrudingly provided on a surface facing the case at the other end of the lid attached to the case with one end engaged with the case. A locking mechanism for the lid to lock the lid in a closed state by being inserted into the insertion hole, wherein the columnar projection is provided so as to protrude straight with respect to the opposing surface, and in the protruding direction. The shape of the cross section orthogonal to the cross section is uniformly formed over the entire length, the insertion hole is formed straight, and the shape of the cross section orthogonal to the depth direction is uniformly formed over the entire length, and the columnar shape is formed. In the intermediate state between the closed state and the open state, the protrusion and the insertion hole interfere with each other at the edge of the insertion hole and the outer surface of the columnar protrusion, or the inner surface of the insertion hole and the tip of the columnar protrusion. Like each other Respectively are formed.
[0008]
The locking mechanism for a lid according to claim 3 is the locking mechanism for a lid according to claim 1 or 2, wherein the columnar projection and the insertion hole are respectively aligned such that their axes coincide with each other in the closed state. It is configured.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of a lid locking mechanism according to the present invention will be described with reference to the accompanying drawings. As an example, a lid provided for the purpose of protecting the mounted data card in a measuring device to which the data card or the like is mounted will be described as an example.
[0010]
First, the configuration of a case (specifically, a front panel of the case) 2 and a cover 3 of a measuring device provided with a lid lock mechanism 1 (see FIG. 2) will be described with reference to FIG.
[0011]
As shown in FIG. 1, as an example, the case 2 is formed in a rectangular box shape, and is formed with an opening 21 that opens from the upper wall 2a to the side wall 2b. . In addition, fitting holes 22 are respectively formed in the lower portions of the pair of facing surfaces SE, SE facing the opening 21 side. In this case, the fitting holes 22, 22 are formed to face each other. Further, the case 2 includes a support wall 23 which extends at a right angle from an end of the upper wall 2a constituting the opening 21 toward the lower wall 2c and abuts on the upper surface of the lower wall 2c. In this case, an insertion hole 24 is formed in the upper surface 23a of the support wall 23 facing the opening 21. As shown in FIG. 2, the insertion hole 24 is formed straight (with its axis perpendicular to the upper wall 2a) along the direction in which the upper surface 23a extends, and perpendicular to the depth direction. The shape of the cross section is circular and formed uniformly over the entire length. Note that the total length here is the total length of a region into which the columnar protrusion 32 described later is inserted, and does not include the length of a deeper region where the columnar protrusion 32 does not reach.
[0012]
As shown in FIGS. 1 and 2, the lid 3 is, for example, a first flat plate-shaped portion 3 a that is flush with the upper wall 2 a of the case 2 in a closed state (the state shown in FIG. 2) and the side wall 2 b of the case 2. A second flat plate portion 3b which is flush with the first flat plate portion 3a and the second flat plate portion 3b are connected at a right angle, so that an L-shape in side view is formed in accordance with the shape of the opening 21. It is formed in a plate-like body bent in a shape. In this case, the lid 3 is manufactured by resin molding so as to be elastically deformable. In addition, cylindrical fitting projections 31, 31 whose axes coincide with each other are formed on one end side (specifically, the lower end side of the second flat plate-shaped portion 3 b) of the lid 3. I have. In this case, the fitting projections 31 are configured to be insertable into the fitting holes 22 respectively.
[0013]
In addition, the other end side (free end side; specifically, in FIG. 2, the end of the first flat plate-shaped portion 3 a on the support wall 23 side) of the cover 3 facing the case 2 (in FIG. On the lower surface), a columnar projection 32 is provided so as to protrude straight in a direction perpendicular to the opposing surface. In this case, as shown in FIG. 2, the columnar projection 32 has a position where its axis is orthogonal to the first plate-shaped portion 3 a and whose axis coincides with the axis of the insertion hole 24 in the closed state of the lid 3. Is formed. The columnar projection 32 has a circular cross section perpendicular to the protruding direction (axial direction) and is formed uniformly over the entire length. Note that the columnar projection 32 may be formed in a so-called draft taper (a shape in which the cross-sectional shape becomes smaller in diameter toward the distal end side). To be uniformly formed over the entire area. The outer diameter of the columnar projection 32 is formed to be slightly smaller than the inner diameter of the insertion hole 24. Further, a hook portion 3c for hooking a finger when opening the lid 3 in a closed state is protrudingly provided on the upper surface of the end of the first flat plate portion 3a on the support wall 23 side. With the above configuration, the lid 3 is inserted into the respective fitting holes 22 of the case 2 as shown in FIG. Is rotatably attached to the case 2 with the fulcrum as a fulcrum. In this case, the rotation axis L (coaxial with each axis of each fitting projection 31, 31) shown in FIG. 2 functions as the fulcrum.
[0014]
Next, the lid locking mechanism 1 will be described.
[0015]
First, the configuration of the lock mechanism 1 will be described. As shown in FIG. 2, the lock mechanism 1 includes at least a columnar projection 32 protruding from the lid 3 and an insertion hole 24 provided in the case 2. In the state, the cover 3 has a function of preventing the cover 3 from unintentionally shifting to an open state due to vibration or the like, that is, a lock function of locking the cover 3 in a closed state.
[0016]
Next, a lock operation of the lock mechanism 1 with respect to the lid 3 will be described with reference to the drawings.
[0017]
First, as shown in FIG. 3, the lid 3 in the open state (state C in FIG. 3) is rotated in the direction to be in the closed state. At this time, the columnar projection 32 moves toward the insertion hole 24 while drawing an arc, and first, the tip of the columnar projection 32 is located at the peripheral portion of the insertion hole 24 (the peripheral portion on the rotation axis L side) on the upper surface 23 a of the support wall 23. The parts come into contact with each other (the state D in the figure). By this contact, the rotation of the lid 3 is temporarily prevented. Next, in this state, an external force F directed toward the insertion hole 24 is further applied to the lid 3 to elastically deform the lid 3, whereby the first flat portion 3 a and the second flat portion 3 b are formed. To 90 ° or more. As a result of the elastic deformation of the lid 3, the columnar projection 32 is separated from the rotation axis L. As a result, the distal end of the columnar projection 32 slides over the peripheral portion of the insertion hole 24 on the upper surface 23a toward the insertion hole 24. To enter the insertion hole 24.
[0018]
When the lid 3 is further rotated from this state, the columnar projections 32 move downward while the surface of the outer surface on the rotation axis L side rubs against the edge of the insertion hole 24 on the rotation axis L side. . During the movement, the columnar projection 32 continues to receive the pressing force in the direction away from the rotation axis L by the edge of the insertion hole 24 on the rotation axis L side. This state corresponds to an intermediate state in the present invention. The pressing force received by the columnar projection 32 from the edge of the insertion hole 24 on the rotation axis L side is immediately after the columnar projection 32 enters the insertion hole 24 in which the axis of the columnar projection 32 is most inclined with respect to the axis of the insertion hole 24. The angle between the axis of the columnar projection 32 and the axis of the insertion hole 24 gradually decreases as the columnar projection 32 moves downward, and thus gradually decreases. In addition, for a while immediately after the columnar projection 32 enters the insertion hole 24, depending on the setting of the length of the columnar projection 32, the tip end of the columnar projection 32 may be in contact with the lid 3 on the inner surface of the insertion hole 24. It may come into contact with the surface of the other end (the side separated from the rotation axis L). In such a case, the tip of the columnar projection 32 also moves downward while rubbing against the surface on the other end side of the lid 3 on the inner surface of the insertion hole 24.
[0019]
Next, as shown in FIG. 2, the opposing surface of the lid 3 abuts on the upper surface 23a of the support wall 23, and the lid 3 shifts to the closed state. In this closed state, the columnar projection 32 is completely inserted into the insertion hole 24, and the axis of the columnar projection 32 matches the axis of the insertion hole 24. Further, in this state, since the inner diameter of the insertion hole 24 is formed to be slightly larger than the outer diameter of the columnar projection 32, each of the rotations on the inner surface of the insertion hole 24 and the outer surface of the columnar projection 32 is designed. A state in which the surfaces on the axis L side and the surfaces on the other end side of the respective lids 3 on the inner surface of the insertion hole 24 and the outer surface of the columnar protrusion 32 are close to each other but with a slight gap therebetween. To maintain. Therefore, the columnar projection 32 is inserted into the insertion hole 24 with slight play without receiving a pressing force from the edge of the insertion hole 24 on the rotation axis L side.
[0020]
In the closed state, when the lid 3 is to be relatively rotated with respect to the case 2 in the opening state due to vibration or the like being applied to the lid 3 or the case 2, At the time of shifting to the state, the outer surface of the columnar projection 32 rubs (interference) between the outer surface of the columnar projection 32 and the edge of the insertion hole 24, and the columnar projection depends on the length of the columnar projection 32 in the same manner as when the columnar projection 32 is inserted. Since the rubbing (interference) between the distal end of the insertion hole 32 and the inner surface of the insertion hole 24 occurs, the transition to the open state beyond the intermediate state is avoided. Therefore, since the columnar projection 32 is prevented from being pulled out of the insertion hole 24, the closed state (locked state) of the lid 3 is maintained by the lock mechanism 1.
[0021]
On the other hand, when opening the lid 3 (shifting from the closed state to the open state), an external force greater than the frictional force generated by the interference between the columnar projection 32 and the edge of the insertion hole 24 is applied to the hook 3c of the lid 3. Add. At this time, as a result of the columnar projection 32 being pulled out from the insertion hole 24, the engagement state between the insertion hole 24 and the columnar projection 32 is released, and the lid 3 shifts to the open state.
[0022]
As described above, according to the lock mechanism 1, at the other end of the lid 3, a columnar projection having a cross section that is straight with respect to the opposing surface and that has a cross section orthogonal to the protruding direction is uniform over its entire length. 32, and the support wall 23 has an insertion hole which is perpendicular to the upper surface 23a, straight downward, and has a uniform cross-sectional shape perpendicular to the depth direction over its entire length. By forming the protrusions 24, the columnar projections 32 and the insertion holes 24 can be formed without requiring undercut. Therefore, the lid 3 on which the columnar projections 32 are formed and the case 2 provided with the insertion holes 24 are resin-molded using a mold having a simple structure without push-off, slide mechanism and / or tilting pin. can do. As a result, the manufacturing cost of the lid 3 and the case 2 and the manufacturing cost of the measuring device can be reduced.
[0023]
In the closed state, the columnar projections are arranged such that the surfaces of the inner surface of the insertion hole 24 and the outer surface of the columnar projection 32 on the side of the rotation axis L or the surfaces of the other end of the lid 3 are close to each other and face each other. By forming the insertion hole 24 and the insertion hole 24, even if vibrations or the like are applied to the case 2 or the lid 3 in the closed state, when transitioning to the above-described intermediate state, the outer surface of the columnar projection 32 and the opening of the insertion hole 24 are closed. Since the rubbing with the edge and the rubbing between the tip of the columnar projection 32 and the inner surface of the insertion hole 24 occur, the transition from the closed state to the open state beyond the intermediate state can be avoided. Therefore, the columnar projection 32 can be prevented from being pulled out of the insertion hole 24, so that the closed state (locked state) of the lid 3 can be reliably maintained by the lock mechanism 1. Further, the columnar projections 32 and the insertion holes 24 are formed so that the columnar projections 32 enter the insertion holes 24 in a state where their axes coincide with each other in the closed state. Applying a pressing force (stress) to the projection 32 from the outer wall of the insertion hole 24 can be avoided. Therefore, it is possible to avoid the occurrence of a problem such as deformation or damage of the columnar projection 32 due to the pressing force, and as a result, it is possible to enhance the durability of the lock mechanism 1.
[0024]
Note that the present invention is not limited to the configuration described in the above embodiment of the present invention. For example, in the embodiment of the present invention, an example in which the lid 3 is formed on a plate-like body bent in an L-shape has been described. However, as shown in FIG. Of course, the lock mechanism 1 of the present invention can be applied. In this case, the column-shaped projection 32 is also provided on the lid 41 on the surface facing the case 2 on the other end side (free end side). Further, in the embodiment of the present invention, the columnar projection 32 is formed in a circular shape (that is, a columnar body) in a direction orthogonal to the protruding direction, and the sectional shape in a direction orthogonal to the depth direction is circular. Although the example in which the insertion hole 24 is formed so as to be described has been described, the cross-sectional shape of the outer surface of the columnar projection 32 is formed in a polygonal or elliptical shape, and the cross-sectional shape of the inner surface of the insertion hole 24 is formed as the columnar projection 32. It may be formed in a polygonal shape or an elliptical shape having a complementary shape.
[0025]
In the above-described embodiment of the present invention, the lids 3 and 41 whose one end is rotatably attached to the case 2 have been described as an example. However, as shown in FIG. It goes without saying that the lock mechanism 1 of the present invention can be applied to the lid 45 having a structure in which it is engaged with and attached to the case 2. In this case, in the lid 45, the columnar projection 32 is provided so as to protrude from a surface facing the case 2 on the other end side (free end side). In addition, an engagement piece 45 a that engages with the inner surface of the case 2 is provided on an end surface on one end side in parallel with the columnar projection 32. Further, in the embodiment of the present invention, an example in which the lid 3 is formed of an elastically deformable material has been described. However, instead of the lid 3, the case 2 is formed of an elastically deformable material, A configuration in which both are formed of an elastically deformable material may be employed. In addition, although a resin material has been described as the elastically deformable material, a configuration using a metal material may be employed. Further, as described above, it is preferable to adopt a configuration in which the columnar projections 32 enter the insertion holes 24 in a state where their axes coincide with each other. However, the axis of the columnar projections 32 is It is also possible to adopt a configuration of shifting in the direction of the rotation axis L or in the direction away from the rotation axis L. According to this configuration, the columnar projection 32 can be formed longer to increase the degree of friction (interference) with the rim of the insertion hole 24, and the tip of the columnar projection 32 and the insertion hole 24 can be increased. It can also interfere with the inner surface.
[0026]
【The invention's effect】
As described above, according to the lid locking mechanism of the first and second aspects, the shape of the cross section that is straight with respect to the surface facing the case at the other end side of the lid and that is orthogonal to the protruding direction is provided. By forming a columnar projection so as to be uniform over its entire length, and by forming an insertion hole so that the shape of a cross section that is straight and orthogonal to the depth direction is uniform over its entire length, The columnar projection and the insertion hole can be configured without the need for cutting. Therefore, the lid having the columnar projections formed thereon and the case having the insertion holes are resin-molded (manufactured) using a mold having a simple structure without a push-off, slide mechanism, and / or a pin. be able to. As a result, manufacturing costs of the lid and the case can be reduced. Further, in the intermediate state, the columnar projection and the insertion hole are configured such that the rim of the insertion hole and the outer surface of the columnar projection, or the inner surface of the insertion hole and the tip of the columnar projection interfere with each other, so that the case or the closed state is formed. Even if vibrations or the like are applied to the lid body, when transitioning to the above-described intermediate state, the edge of the insertion hole and the outer surface of the columnar projection, or the inner surface of the insertion hole and the tip of the columnar projection interfere with each other. The transition from the closed state to the open state beyond the intermediate state can be avoided. Therefore, the columnar projection can be prevented from being pulled out of the insertion hole, and as a result, the locked state of the lid can be reliably maintained by this lock mechanism.
[0027]
According to the locking mechanism of the lid according to the third aspect, in the closed state, the columnar projection and the insertion hole are respectively configured such that their axes coincide with each other. Applying a pressing force (stress) from the outer wall of the insertion hole can be avoided. Therefore, it is possible to avoid the occurrence of a problem such as deformation or damage of the columnar projection due to the pressing force, and as a result, it is possible to enhance the durability of the lock mechanism.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a configuration of a case 2 and a lid 3 according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the vicinity of the lid 3 obtained by cutting the case 2 and the lid 3 in a closed state in FIG. 1 at a position of an insertion hole 24 by a plane orthogonal to a second flat plate portion 3b.
FIG. 3 is a cross-sectional view of the vicinity of a lid 3 showing a lock operation by a lock mechanism 1;
FIG. 4 is a cross-sectional view of the vicinity of the lid 41 showing a state in which the lock mechanism 1 is applied to a lid 41 having another configuration.
FIG. 5 is a cross-sectional view of the vicinity of the lid 45 showing a state in which the lock mechanism 1 is applied to a lid 45 having another configuration.
FIG. 6 is a cross-sectional view showing a configuration of a conventional lock mechanism 51.
[Explanation of symbols]
Reference Signs List 1 lock mechanism 2 case 3, 41, 45 lid 24 insertion hole 32 columnar projection 45a engagement piece L rotation axis (fulcrum)

Claims (3)

By inserting a columnar projection protruding from a surface facing the case at the other end of the lid rotatably attached to the case with the one end as a fulcrum, into the insertion hole provided in the case. A lid locking mechanism for locking the lid in a closed state,
The columnar projection is formed so as to protrude straight with respect to the opposing surface and has a cross-sectional shape orthogonal to the protruding direction formed uniformly over the entire length thereof,
The insertion hole is formed straight and has a uniform cross-sectional shape perpendicular to the depth direction over its entire length,
In the intermediate state between the closed state and the open state, the columnar projection and the insertion hole have an edge of the insertion hole and an outer surface of the columnar projection, or an inner surface of the insertion hole and a tip of the columnar projection. Lock mechanisms for lids that are configured to interfere with each other. By inserting a columnar projection protruding from the other end of the lid attached to the case by engaging one end with the case and facing the case, into the insertion hole provided in the case, A lid locking mechanism for locking the body in a closed state,
The columnar projection is formed so as to protrude straight with respect to the opposing surface and has a cross-sectional shape orthogonal to the protruding direction formed uniformly over the entire length thereof,
The insertion hole is formed straight and has a uniform cross-sectional shape perpendicular to the depth direction over its entire length,
In the intermediate state between the closed state and the open state, the columnar projection and the insertion hole have an edge of the insertion hole and an outer surface of the columnar projection, or an inner surface of the insertion hole and a tip of the columnar projection. Lock mechanisms for lids that are configured to interfere with each other. The locking mechanism for a lid according to claim 1 or 2, wherein the columnar projection and the insertion hole are configured such that axes thereof are aligned with each other in the closed state.

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