JP4513711B2 - Tabletop - Google Patents

Description

  The present invention relates to a table tap, and more particularly to a door-equipped table tap including a door that opens and closes a plug blade insertion hole.

  Conventionally, plugs have been connected to the table taps to prevent intrusion of foreign substances such as dust from the plug tap insertion holes of the table taps or electric shocks by touching the charging parts such as the internal blade receiving parts. A table tap with a door that shields the plug blade insertion hole when not present is provided.

  As this type of table tap, for example, there is one disclosed in Patent Document 1, and the table tap of Patent Document 1 includes a housing having a cover having a plug blade insertion hole and a body, and an interior thereof. Includes two terminal plates each having a plurality of blade receiving portions for receiving the plug blades of the plugs inserted from the plug blade insertion holes, and a synthetic resin middle body for housing the terminal plates, An insertion hole opening / closing means for opening / closing the plug blade insertion hole in accordance with the insertion / extraction of the plug blade of the plug is accommodated.

  The insertion hole opening / closing means includes a door portion interposed between the plug blade insertion hole and the blade receiving portion, and a spring member for biasing the door portion so that the door portion moves to a position where the plug blade insertion hole is closed. This door part, when the blade is not inserted into the blade insertion hole, is urged by a spring member to move to the position where the blade insertion hole is closed, and the blade is inserted into the blade insertion hole. When it does, it is comprised so that it may move to the position which opens a plug blade insertion hole against the urging | biasing of a spring member.

Here, as a spring member used for the insertion hole opening / closing means, a substantially M-shaped leaf spring 100 as shown in FIGS. 9A to 9D has been conventionally provided. Such a leaf spring 100 is bent from an elastic long metal plate and fixed to a housing or the like, and a fixed piece 101 from both longitudinal ends of the fixed piece 101. A pair of door portion pressing pieces 102 and 103 extending in an acute angle direction are integrally provided.
JP-A-2004-221033 (FIGS. 1, 6, and 7)

  However, in the above-described leaf spring 100, in order for the leaf spring 100 to operate correctly, as shown in FIG. 9B, the tracks C1 and C2 at the end portions of the door portion pressing pieces 102 and 103 must not overlap. Accordingly, the distance between the door pressing pieces 102 and 103, that is, the length of the fixed piece 101 with respect to the length dimension (hereinafter, referred to as “span”) t1 of the door pressing pieces 102 and 103. There is a design restriction that the dimension t2 must be larger than twice the span t1, and this restriction has hindered downsizing of the leaf spring.

  Further, in such a leaf spring 100, stress concentration occurs in the bent portion between the door pressing pieces 102 and 103 and the fixed piece 101, and the door pressing pieces 102 and 103 When the angle between the fixed piece 101 is increased, the stress concentration at the bent portion is increased. Therefore, it is preferable to increase the span t1 to increase the bending stroke. The length dimension t2 must also be increased, and as a result, the leaf spring 100 becomes larger.

Therefore, in a conventional table tap using such a leaf spring 100, the leaf spring 10
When trying to reduce the stress concentration at the 0-bent portion , the leaf spring 100 cannot be reduced in size, and as a result, the table tap cannot be reduced in size. On the other hand, when the leaf spring 100 is downsized, the stress concentration at the bent portion of the leaf spring 100 increases, and the leaf spring 100 is likely to malfunction due to plastic deformation, breakage due to metal fatigue, and the like.
As a result, there has been a new problem that the opening / closing operation of the table tap cannot be performed stably.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a table tap that can be reduced in size and can perform a stable opening / closing operation.

In order to solve the above-mentioned problems, in the invention of the table tap according to claim 1, a casing having a pair of plug blade insertion holes into which a pair of plug blades of a plug are respectively inserted, and a plug blade housed in the casing. A pair of plug receiving blades inserted into the insertion hole, and a plug receiving portion inserted between the pair of plug blade inserting holes and the blade receiving portion. A pair of plug blades can be slidably moved in a direction inclined with respect to the plug insertion direction between the middle frame having a pair of plug blade insertion holes for passing the pair of blades toward the blade receiving portion and the plug blade insertion holes Is fixed to a substantially intermediate portion between the pair of plug blade insertion holes in the middle frame, and the door portion is moved to a position to close the plug blade insertion hole. Open / close means comprising a spring member that presses the door portion toward the plug blade insertion hole side, and the spring portion Is formed of a single metal plate and fixed to the inner frame, and extends from both ends of the fixed piece in the length direction to the fixed piece in an acute angle direction and interferes with each other. A pair of door portion pressing pieces that are shifted in the width direction so that the front portion is formed with a narrower width with respect to the base portion from the base side between the front portion and the base portion. A region that gradually narrows toward the front side is formed .

  According to the invention of the table tap of claim 2, in addition to the configuration of claim 1, the pair of door portion pressing pieces of the spring member intersect each other.

  According to the invention of the table tap of claim 3, in addition to the structure of claim 1 or 2, the middle frame is provided with a recess for fixing the spring member in which the fixing piece of the spring member is disposed, The fixing piece is provided with a locking claw that is hooked and locked to the inner surface of the recess.

Since the invention of the table tap of claim 1 does not need to increase the length of the fixed piece even when trying to reduce the stress concentration at the bent part by increasing the span of the door pressing piece, It is possible to reduce both stress concentration at the bent part and downsize the spring member. This makes it possible to reduce the size of the table tap, and causes the spring member to malfunction or break. As a result, it is possible to reduce the possibility that the opening / closing operation of the door portion cannot be performed correctly, and it is possible to perform a stable opening / closing operation. Furthermore, the spring member is formed with a portion that becomes gradually narrower from the base side to the front side between the front part and the base part of the door pressing piece, thereby reducing stress concentration at the bent part of the spring member. Thus, the possibility that the spring member may malfunction or break and the door portion cannot be correctly opened / closed can be reduced, and the opening / closing operation can be performed stably.

  In addition to the effect of claim 1, the invention of the table tap of claim 2 can shorten the distance between the tip of the door pressing piece and the fixed piece even when the span of the door pressing piece is increased. The spring member has an effect that it is possible to further reduce the size of the spring member. Further, when the pair of door portion pressing pieces are bent, the distance between the distal end portions of the door portion pressing pieces becomes longer. Therefore, when the door portion is moved against the urging force of the spring member, it is possible to suppress the rattling of the door portion, thereby achieving an effect that a stable opening / closing operation can be performed.

  In addition to the effect of claim 1 or 2, the invention of the table tap of claim 3 has the effect that the spring member can be firmly fixed without rattling to the inner frame, thereby improving the opening and closing feel of the door portion. In addition, there is an effect that it is possible to prevent the spring member from falling off from the middle frame at the time of assembly and to facilitate the assembly work.

  Hereinafter, an embodiment of a table tap according to the present invention will be described with reference to FIGS. In the following description, the front side of the page of FIG. 1A is the upper side of the table tap, and the back side of the page of FIG. 1A is the lower side of the table tap, but this is for the sake of simplicity. Thus, this does not mean that the usage form of the table tap is limited to the above-described direction.

  The table tap of this embodiment is a table tap with a waterproof and dustproof door, and as shown in FIGS. 1A to 1C, a pair of plug blades P1, P2 of the plug P (see FIG. 6). ) Are inserted into the pair of plug blade insertion holes 3a and 3b and the pair of plug blades of the plug P housed in the case 1 and inserted into the plug blade insertion holes 3a and 3b. The blade receptacles 20 to 22 and 25 to 27 to which P1 and P2 are contact-connected, and the plugs interposed between the pair of plug blade insertion holes 3a and 3b and the blade receptacles 20 to 22 and 25 to 27, respectively. A middle frame 6 having a pair of plug blade insertion holes 60 and 61 for passing the pair of plug blades P1 and P2 of the plug P inserted from the blade insertion holes 3a and 3b to the blade receiving portions 20 to 22 and 25 to 27, respectively; In the direction inclined with respect to the insertion direction of the plug P between the blade insertion holes 3a, 3b and the inner frame 6 The door is fixed to a substantially intermediate portion between the pair of plug blade insertion holes 60 and 61 in the middle frame 6 and the door 4 that opens and closes the pair of plug blade insertion holes 3a and 3b. The spring member 5 includes an opening / closing means including a spring member 5 that presses the door portion 4 toward the plug blade insertion holes 3a and 3b so that the portion 4 moves to a position where the plug blade insertion holes 3a and 3b are closed. A fixed piece 50 that is bent from a single metal plate and fixed to the inner frame 6, and extends in an acute angle direction with respect to the fixed piece 50 from both ends in the length direction of the fixed piece 50, A pair of door portion pressing pieces 51 and 52 that are shifted in the width direction so as not to interfere with each other are provided.

  As shown in FIGS. 1A to 1C, the housing 1 includes a long box-like body 10 having an upper surface opened and a cover 11 that covers the upper surface opening of the body 10. Both the cover 10 and the cover 11 are resin molded products using a thermoplastic resin (for example, vinyl chloride).

  As described above, the body 10 is in the shape of a long box whose upper surface is open, and has a substantially rectangular shape for the door unit U on the side surface on one end side in the longitudinal direction (the lower side in FIG. 1A). The notch 10a is formed. Further, a substantially rectangular cutout portion 10b for inserting the power cord 7 is formed on the side surface on the other end side in the longitudinal direction of the body 10 (upper side in FIG. 1A), and in the vicinity of the cutout portion 10b. Is provided with a protrusion 10c for fixing the bushing 8 (see FIG. 1B). In addition, a substantially cylindrical boss portion 10 d having a screw insertion hole 10 e through which an assembly screw S for coupling the body 10 and the cover 11 is inserted is formed on the upper surface of the bottom portion of the body 10 in the longitudinal direction of the body 10. Three of them are projected in one. Further, as shown in FIG. 3, a tension retaining rib 10 f of the power cord 7 is integrally projected on the other end in the longitudinal direction on the upper surface of the bottom of the body 10. On the other hand, a protruding wall portion 10g is integrally projected at the center portion in the width direction of the upper end surface of the side wall portion of the body 10 so as to extend along the longitudinal direction of the upper end surface.

  The cover 11 is attached to the body 10 so as to close the upper surface opening of the body 10, and is formed in a long box shape with the lower surface opened. A substantially rectangular cutout portion 11a that forms a window hole 12a for the door unit U together with the cutout portion 10a of the body 10 is formed on the side surface of one end in the longitudinal direction of the cover 11 (the lower side in FIG. 1A). Has been. In addition, two substantially rectangular window holes 12 b and 12 c for the door unit U are provided in the upper wall portion of the cover 11 in the longitudinal direction of the cover 11. Further, a substantially rectangular cutout portion 11b that constitutes the insertion hole 13 for the power cord 7 together with the cutout portion 10b of the body 10 is provided on the side surface on the other end side in the longitudinal direction of the cover 11 (upper side in FIG. 1A). As in the case of the body 10, a protrusion 11c for fixing the bushing 8 (see FIG. 1B) is provided in the vicinity of the notch 11b.

  On the other hand, on the lower surface of the upper wall portion of the cover 11, as shown in FIG. 1 (b), a substantially cylindrical boss portion 11 d is integrally projected at a position facing the boss portion 10 d of the body 10. A screw hole 11e for the assembly screw S is formed in each boss portion 11d so as to communicate with the screw insertion hole 10e of the boss portion 10d of the body 10. In addition, on the other end in the longitudinal direction on the lower surface of the upper wall portion of the cover 11, a rib (not shown) for holding the power cord 7 with the rib 10f and holding the power cord 7 in tension is integrated. Projected to Further, as shown in FIG. 1 (c), a groove 11 f into which the protruding wall 10 g of the body 10 is fitted is recessed in the lower end surface of the side wall of the cover 11. Are combined with the assembly screw S so that the protruding wall portion 10g is in close contact with the inner surface of the groove portion 11f, thereby improving the waterproofness and dustproofness of the housing 1. Moreover, the protrusion part 15 which protrudes in a window hole is provided in the inner peripheral surface of the window holes 12a-12c of the housing | casing 1, Thereby, the adhesiveness of the outer packing part 31 and the housing | casing 1 is improved. ing.

  By the way, an inner body 14 for fixing and supporting the terminal plates 2A and 2B is accommodated in the housing 1. Here, the middle body 14 is a resin molded product, and is formed in a long box shape with an upper surface opened as shown in FIG. The side surface on one end side in the longitudinal direction of the inner body 14 (the lower side in FIG. 1A) is opened so that the plug blades P1 and P2 can be connected to the terminal plates 2A and 2B through the window holes 12a. Also, on the upper surface of the bottom of the middle body 14, a pair of ribs 14a and 14b for fixing the terminal plates 2A and 2B, and a plurality of isolation walls 14c for insulating and isolating the terminal plates 2A and 2B, respectively Are projecting together. Further, a pair of hole portions 14d through which two boss portions 10d of the three boss portions 10d of the body 10 excluding the boss portion 10d on the other end side in the longitudinal direction of the body 10 are respectively inserted through the bottom portion of the middle body 14. Is penetrated.

Next, the terminal plates 2A and 2B to be mounted on the middle body 14 will be described. The terminal plate 2A is formed of a long metal plate having conductivity, and as shown in FIG. 3, a first blade receiver having a pair of blade receiving springs 20a and 20a corresponding to the window holes 12a. And a second blade having a pair of blade receiving springs 21a and 21a extending from the first blade receiving portion 20 to the other end in the longitudinal direction (the upper side in FIG. 1B) and corresponding to the window hole 12b. A flat plate portion 23 having a receiving portion 21 and a pair of hole portions 23a, 23a extending from the second blade receiving portion 21 to the other end in the longitudinal direction and engaging with the pair of ribs 14a of the intermediate plate 14, respectively. A third blade receiving portion 22 having a pair of blade receiving springs 22a, 22a extending rearward from the flat plate portion 23 in the longitudinal direction and corresponding to the window hole 12c, and from the third blade receiving portion 22 in the longitudinal direction. A caulking portion 24 that extends to the other end side and caulks and fixes the core wire 7 a of the power cord 7. It has to.

  On the other hand, as shown in FIG. 3, the terminal plate 2B is bent from a long metal plate having conductivity similar to the terminal plate 2A, and a pair of blade receiving springs 25a corresponding to the window holes 12a. , 25a, and a pair of blade receiving springs extending from the first blade receiving portion 25 to the other end in the longitudinal direction (the upper side in FIG. 1B) and corresponding to the window hole 12b. A second blade receiving portion 26 having 26a, 26a, and a pair of holes extending from the second blade receiving portion 26 to the other end in the longitudinal direction and engaging with the pair of ribs 14b, 14b of the intermediate plate 14 respectively. A flat plate portion 28 having portions 28a, 28a, a third blade receiving portion 27 having a pair of blade receiving springs 27a, 27a extending from the flat plate portion 28 to the other end in the longitudinal direction and corresponding to the window hole 12c, 3 is extended from the blade receiving portion 27 to the other end in the longitudinal direction, and the core wire 7b of the power cord 7 is caulked and fixed. And a caulking portion 29 for being provided integrally.

  Furthermore, a total of three door units U having plug blade insertion holes 3a and 3b are attached to the housing 1 corresponding to the respective window holes 12a to 12c, and the door unit U will be described below. However, as shown in FIG. 3, the door unit U has a different orientation depending on the attachment position to the housing 1. Therefore, for simplification of description, the door unit U is limited to the description of the door unit U as shown in FIG. ) Is the front of the door unit U, the lower part of FIG. 1C is the rear of the door unit U, the right side of FIG. 1C is the right side of the door unit U, and the left side of FIG. This is the left side of the door unit U.

  The door unit U has a function of preventing foreign matter and dust from entering the housing 1 from the plug blade insertion holes 3a and 3b, and also prevents water from entering the housing 1 from the blade insertion holes 3a and 3b. A pair of plug blades of a plug P as shown in FIG. 3, which has a waterproof function and a dustproof function for preventing dust and dust from entering the casing 1 from the plug blade insertion holes 3a and 3b. A box-shaped integrally formed block 3 having a pair of plug blade insertion holes 3a and 3b into which P1 and P2 are respectively inserted and having a rear surface facing the front surface opened, and a pair of plug blades of the integrally formed block 3 A unit comprising a middle frame 6 that has a pair of plug blade insertion holes 60 and 61 through which a pair of plug blades P1 and P2 inserted from the insertion holes 3a and 3b are inserted, respectively, and closes the rear surface opening of the integrally formed block 3 The main body and the unit main body are slidably stored. The door part 4 which opens and closes a pair of plug blade insertion holes 3a and 3b, and the spring member 5 which urges the door part 4 so that the door part 4 moves to the position which closes a pair of plug blade insertion holes 3a and 3b. And opening / closing means.

  As shown in FIG. 1C, the integrally molded block 3 includes a main body portion 30 made of a resin molded product using a hard resin material such as urea resin having excellent tracking resistance and heat resistance, and rubber, elastomer, etc. It consists of a resin molded product using a soft resin material having resilience (elasticity), and is composed of an outer packing portion 31 and an inner packing portion 32 that are integrally formed with the main body portion 30.

  The main body portion 30 is formed in a box shape with an open rear surface, and a projecting boss portion 30a disposed in the window hole of the housing 1 is integrally projected at the front center portion thereof. . Plug blade insertion holes 3a and 3b are provided through the front wall of the boss 30a. Moreover, as shown in FIG.1 (c), it has the inclined surface 30b which inclines back from the left of the main-body part 30 toward the right on the rear surface side in the both inner side surfaces of the transversal direction of the main-body part 30. Guide ribs 30c are provided. In addition, a pair of ribs 30d that come into contact with the side periphery of the inner frame 6 are provided on the rear end side of each inner side surface of the main body 30, and the middle frame 6 is fitted into a portion between the ribs 30d. Thus, the inner frame 6 can be fixed to the integrally formed block 3.

The outer packing portion 31 is interposed between the main body portion 30 of the integrally formed block 3 and the edge portions of the window holes 12a to 12c, and water enters the housing 1 from the window holes 12a to 12c of the housing 1. The peripheral wall part 31a surrounding the boss part 30a including the pair of plug blade insertion holes 3a and 3b, and the front surface of the main body part 30 projecting outward from the rear end part of the peripheral wall part 31a. And a flange 31b that covers the periphery of the boss 30a.

  Here, as shown in FIG. 1C, the peripheral wall portion 31 a has a front end surface protruding forward from the front surface of the boss portion 30 a, and an outer shape of the peripheral wall portion 31 a is a plug blade P <b> 1 in a general plug P. P2 is formed so as to fit in the outer shape of the projecting surface. Therefore, when the plug blades P1 and P2 of the plug P are contact-connected to the blade receiving portion in the housing 1 through the pair of plug blade insertion holes 3a and 3b, the plug blades P1 and P2 of the plug P project. The front end surface of the peripheral wall portion 31a of the outer packing portion 31 is in close contact with the surface that is provided (that is, the surface of the plug P facing the main body portion 30), thereby eliminating the gap between the plug P and the housing 1. Thus, the plug blades P1 and P2 of the plug P can be protected from water and dust, and the occurrence of tracking and short-circuiting can be prevented. Further, since the outer packing portion 31 has resilience (elasticity) as described above, by deforming it so as to be compressed between the main body portion 30 and the plug P, the plug P has a slight inclination or Even if the surface is raised and uneven, the gap between the plug P and the housing 1 can be eliminated.

  In addition, an outer wall portion 31c and an inner wall portion 31d projecting forward are integrally provided on the front end surface of the peripheral wall portion 31a, whereby the peripheral wall portion 31a is connected to the plug P between the outer wall portion 31c and the inner wall portion 31d. Since it adheres in two places, the adhesiveness of the surrounding wall part 31a and the plug P can be improved more, and, thereby, the further waterproof improvement can be aimed at.

  The inner packing portion 32 is interposed between the door portion 4 and the edge of the plug blade insertion holes 3a, 3b of the main body portion 30 with the plug blade insertion holes 3a, 3b closed by the door portion 4, This is for preventing water from entering the housing 1 through the plug blade insertion holes 3a, 3b, and is formed in a shape that covers the rear surface of the front wall portion of the boss portion 30a.

  Further, by integrally forming the outer packing portion 31 and the inner packing portion 32 in the main body portion 30, the adhesion between the packing portions 31, 32 and the main body portion 30 is enhanced. Water, dust, and the like are prevented from entering between the main body portion 30 and the main body portion 31,32.

  The door part 4 is formed in a rectangular plate shape using, for example, a synthetic resin, and when the door part 4 is positioned at a position to close the pair of plug blade insertion holes 3a and 3b on the front surface thereof, the pair of plug blades is inserted. Projecting portions 40 and 41 for shielding the plug blade insertion holes 3a and 3b are integrally projected at portions facing the holes 3a and 3b. In addition, an insertion hole 42 for passing one plug blade P2 of the plug P to the blade receiving portion side is provided in a portion between the projecting portions 40 and 41 on the front surface of the door portion 4. Furthermore, substantially cylindrical protrusions 43 and 43 serving as slide axes of the door 4 are formed at the center in the longitudinal direction on both side surfaces in the short direction of the door 4 (that is, the direction intersecting the plug insertion direction). It protrudes integrally so as to be coaxial in the short direction.

  The spring member 5 is a plate spring bent from a single long metal plate having elasticity, and is a plate-like fixed piece fixed to the inner frame 6 as shown in FIG. 50 and the longitudinal direction (length direction) of the fixed piece 50 are respectively extended in an acute angle direction (about 60 degrees in the present embodiment) with respect to the fixed piece 50 and shifted in the width direction. It has a pair of door part pressing pieces 51 and 52 that intersect. Here, a pair of claw portions 50 a for fixing the spring member 5 to the middle frame 6 are integrally provided at both ends in the short direction (width direction) of the fixing piece 50. Further, as shown in FIGS. 4B to 4D, the pair of door portion pressing pieces 51 and 52 are formed with a narrow width with respect to the base portion, thereby forming a pair of door portion pressing pieces 51. , 52 are shifted in the width direction so that no overlapping portion is generated between the space portions through which the respective leading portions pass, so that both door portion pressing pieces 51 irrespective of no load and bending. , 52 do not interfere with each other.

  According to such a spring member 5, a design constraint like the conventional leaf spring 100 shown in FIG. 9 is provided between the span of each door pressing piece 51, 52 and the length of the fixed piece 50. Disappears. For this reason, when the span of the door pressing pieces 51 and 52 is increased for the purpose of extending the bending stroke, it is not necessary to increase the length of the fixed piece 50, thereby reducing the stress concentration at the bending portion. However, it is possible to reduce the size of the spring member 5.

  Furthermore, the front end portions 51a and 52a, which are portions that are elastically contacted with the door portion 4 and slide on the door portion 4 in the door portion pressing pieces 51 and 52, are formed in a substantially spherical surface shape. Thereby, compared with the case where there are edges and corners in the front end portions 51a and 52a, the front end portions 51a and 52a of the door pressing pieces 51 and 52 are easily slid on the door portion 4, and the operation of the door portion 4 is performed. Can be improved. In addition, it is possible to prevent the door portion 4 from being deteriorated due to wear as compared with the case where there is an edge or corner. In addition, as shown in FIGS. 4B to 4D, the door portion pressing pieces 51 and 52 gradually increase from the base side toward the front side as shown in FIGS. A narrow portion 51b is provided to alleviate stress concentration generated at the boundary between the base and the tip.

  The middle frame 6 closes the rear opening of the integrally formed block 3 and is formed in a rectangular plate shape using, for example, a synthetic resin. As shown in FIG. 5A, plug blade insertion holes 60 and 61 through which the plug blades of the plug are inserted are provided in the left and right ends of the middle frame 6. Further, on the front surface of the middle frame 6, a substantially rectangular recess 62 for fixing the spring member 5 in which the fixing piece 50 of the spring member 5 is disposed is recessed at an intermediate portion between the plug blade insertion holes 60 and 61. It is installed. Further, on the front surface of the middle frame 6, the portion facing the guide ribs 30 c and 30 c of the integrally formed block 3 is directed from the left side to the right side of the middle frame 6 as shown in FIGS. 5 (a) to 5 (e). In addition, guide ribs 63 each having an inclined surface 63a inclined rearward are provided to protrude.

  Here, the inclined surfaces 30b of the guide ribs 30c of the integrally molded block 3 and the inclined surfaces 63a of the guide ribs 63 of the middle frame 6 are substantially parallel to each other in the creeping direction, and between these inclined surfaces 30b and 63a. The space portion is used as a guide groove of the protrusion 43 of the door portion 4, and the groove direction of the guide groove is inclined with respect to the insertion direction of the plug blades P1, P2 of the plug P (the front-rear direction of the door unit U). The direction (direction from the left front of the door unit U toward the right rear).

  The door unit U including the integrally formed block 3, the door portion 4, the spring member 5, and the middle frame 6 is assembled as follows. First, as shown in FIG. 5A, the spring member 5 is attached to the middle frame 6 by fitting the fixing piece 50 of the spring member 5 into the recess 62 of the middle frame 6. At this time, as shown in FIG. 5 (c), the claw portion 50 a of the spring member 5 is caught on the inner surface of the recess 62 in the recess 62, so that the spring member 5 is firmly fixed without rattling to the inner frame 6. Thus, the opening / closing feel of the door portion 4 can be improved, and the spring member 5 can be prevented from falling off from the middle frame 6 during assembly, so that the assembly work can be easily performed.

  Next, the door part 4 is accommodated in the integrally molded block 3 as shown in FIG. 1 (c), and thereafter, the middle frame 6 to which the spring member 5 is attached is placed between the ribs 30 d of the body molded block 3. By inserting, the inner frame 6 is fixed to the integrally formed block 3, thereby completing the door unit U.

  In the door unit U assembled in this way, as shown in FIG. 1 (c), the shaft portions 43, 43 of the door portion 4 are connected to the inclined surfaces 30 b of the guide ribs 30 c, 30 c of the integrally molded block 3 and the inner frame 6. The guide rib 63 is fitted into a guide groove formed of a space between the inclined surface 63a of the guide rib 63 so as to be slidable in the groove direction of the guide groove and to be rotatable about the short direction of the door portion 4 as a rotation axis. The front end portions 51a and 52a of the pair of door portion pressing pieces 51 and 52 of the spring member 5 are elastically contacted with the center of the rear surface of the door portion 4, whereby the door portion 4 is moved forward along the guide groove, The plug blade insertion holes 3a and 3b of the integrally formed block 3 are closed by the projecting portions 40 and 41 of the door portion 4. At this time, the door portion 4 is biased forward by the spring member 5, thereby improving the adhesion between the door portion 4 and the inner packing 32, thereby improving the waterproof property. In addition, since the spring member 5 is fixed to an intermediate portion between the pair of plug blade insertion holes 60 and 61 in the middle frame 6, in a state where the door portion 4 closes the pair of blade insertion holes 3a and 3b, The intermediate part between the pair of projecting parts 40 and 41 in the door part 4 is pressed by the spring member 5, whereby the projecting parts 40 and 41 are brought into close contact with the inner packing part 32 with a substantially uniform force. Therefore, waterproofness is further improved. Furthermore, since the door portion 4 can be moved in the left front direction inclined in the insertion direction of the plug P by one spring member 5, the spring member for urging the door portion 4 in the left direction and the door portion 4 are moved forward. It is not necessary to use two spring members, that is, a spring member that biases in the direction, thereby reducing the number of parts.

  The bushing 8 covers the outer periphery of the power cord 7 drawn out from the housing 1 to prevent disconnection due to bending of the inner core wires 7a and 7b, and has waterproof and dustproof properties at the insertion hole 13 for the power cord 7. This is for improvement, and is made of a resin molded product such as rubber integrally including a cylindrical portion 80 surrounding the power cord 7 and a flange portion 81 provided on one end side of the cylindrical portion 80. In addition, a plurality of protrusions 80 a that contact the power cord 7 without gaps are provided on the inner peripheral surface of the cylindrical portion 80 of the bushing 8, and the protrusion 10 c and the protrusion 10 c of the body 10 are provided on the outer peripheral surface of the flange 81. Concave portions 81 a are provided in which the protrusions 11 c of the cover 11 are engaged with each other.

  The table tap of this embodiment is comprised by the said member, and the assembly method of a table tap is demonstrated below.

  First, the middle body 14 is attached to the body 10, and the boss portions 10 d and 10 d of the body 10 are inserted into the holes 14 d and 14 d of the middle body 14. After this, the ribs 14a and 14b of the middle body 14 and the holes 23a and 28a of the terminal plates 2A and 2B are fitted into the concave and convex portions, so that the terminal portions 2A and 2B are attached to the middle body 14, respectively. Then, the core wires 7a and 7b of the power cord 7 are caulked and fixed to the caulking portions 24 and 29 of the terminal plates 2A and 2B, respectively, and the power cord 7 is pulled out from the cutout portion 10b of the body 10, The power cord 7 is covered with a bushing 8 and the recess 81a of the bushing and the protrusion 10c of the body 10 are fitted in an uneven manner. The door unit U is directed into the body 10, the plug blade insertion holes 3a and 3b of the integrally formed block 3 are directed outward of the housing, the blade insertion holes 60 and 61 of each door unit U, and the terminal plates. The first blade receiving portions 20 and 25, the second blade receiving portions 21 and 26, and the third blade receiving portions 22 and 27 of 2A and 2B are arranged in correspondence with each other.

  After this, the body 10 and the cover 11 are joined together. This operation allows the boss portion 30a of the integrally formed block 3 to face outward from the respective window holes 12a to 12c, and the concave portion 81a of the bushing 8 and the cover. 11 is engaged with the projections 11c of the cover 11 and the screw holes 11e of the cover 11 and the screw insertion holes 10e of the body 10 are communicated with each other. The assembly screws S are screwed into the screw holes 11e of the cover 11. It is done by doing. When the body 10 and the cover 11 are coupled, the power cord 7 is held between the rib 10f of the body 10 and the rib (not shown) of the cover 11, and the tension of the power cord 7 is stopped. .

  1A to 1C is obtained as described above, and in this table tap, between the main body portion 30 of the integrally formed block 3 of the door unit U and the edge portions of the window holes 12a to 12c. An outer packing portion 31 interposed between the door portion U, the inner packing portion 32 interposed between the door portion 4 of the door unit U and the edges of the plug blade insertion holes 3a and 3b of the main body portion 30, the power cord 7 and the housing. The bushing 8 interposed between the edge of the insertion hole 13 of the body 1 prevents water and dust from entering the housing 1, and the protruding wall portion 10 g of the body 10 is a groove portion of the cover 11. By fitting into 11f, water and dust are prevented from entering the housing 1 through the gap between the body 10 and the cover 11.

  Next, the opening / closing operation | movement of the door part 4 of the door unit U at the time of attaching / detaching the plug P to the table tap of this embodiment is demonstrated with reference to FIG.6 and FIG.7. In the following description of the operation, for simplification of description, the upper side of FIG. 6A is the front side of the door unit U, the lower side of FIG. 6A is the rear side of the door unit U, and FIG. ) Is the left side of the door unit U, and the right side of FIG.

  First, when the plug P is not connected to the table tap, as shown in FIG. 6A, the projecting portions 40 and 41 of the door portion 4 are behind the plug blade insertion holes 3 a and 3 b of the integrally formed block 3. The plug blade insertion holes 3a and 3b are in a closed state. Moreover, at this time, as shown to Fig.7 (a), the protrusion 43 of the door part 4 is in the state located most forward.

  When the plug P is connected to the table tap, as shown in FIG. 6A, the plug blades P1 and P2 of the plug P are inserted into the plug blade insertion holes 3a and 3b, and the projecting base of the door portion 4 is inserted. The abutment portions 40 and 41 are pressed against the urging force of the spring member 5 as shown in FIG. 6B, and the door portion 4 is pushed rearward. When the door part 4 is pushed backward by the plug blades P1 and P2, the protrusions 43 and 43 of the door part 4 are inclined by the guide ribs 63 and 63 of the inner frame 6 as shown in FIG. 7B. It contacts the surfaces 63a, 63a. When the plug blades P1 and P2 are further pushed in from here, since the inclined surfaces 63a and 63a face the right front, the protrusions 43 and 43 of the door portion 4 are along the inclined surfaces 63a and 63a. By sliding to the right rear, the door portion 4 is guided to the right rear of the door unit U. If the door part 4 is moved to the right rear as it is, as shown in FIG. 6 (c), the projecting parts 40 and 41 are shifted from the rear side of the plug blade insertion holes 3a and 3b to the right side. The portion 4 is no longer positioned behind the plug blade insertion hole 3a, and the insertion hole 42 of the door portion 4 is positioned behind the plug blade insertion hole 3b. As a result, the plug blade insertion holes 3a, 3b of the integrally formed block 3 and the plug blade insertion holes 60, 61 of the inner frame 6 are opposed in the front-rear direction. It becomes possible to make contact connection to the blade receiving portions 22 and 27 of 2A and 2B, respectively.

  On the other hand, when the plug blades P1 and P2 of the plug P are pulled out from the table tap, the door portion 4 is moved forward by the spring member 5 because no external force is applied to the door portion 4 by the plug blades P1 and P2. The projections 43 and 43 of the door 4 abut against the inclined surfaces 30b and 30b of the integrally molded block 3 as shown in FIG. And since the surface direction of the inclined surfaces 30b, 30b is directed to the left rear, the protrusions 43, 43 of the door portion 4 slide to the left front along the inclined surfaces 30b, 30b, thereby the door portion. 4 is guided to the left front of the door unit U. If the door part 4 moves to the left front as it is, the projecting parts 40 and 41 of the door part 4 will eventually be located behind the plug blade insertion holes 3a and 3b. As a result, as shown in FIG. Thus, the plug blade insertion holes 3 a and 3 b are shielded by the door portion 4.

According to the table tap of this embodiment described above, the spring member 5 that presses the door portion 4 that opens and closes the blade insertion holes 3a and 3b of the housing 1 toward the blade insertion holes 3a and 3b is provided in the middle frame 6. And a pair of door portion presses extending in the acute angle direction from both longitudinal ends of the fixed piece 50 to the fixed piece 50 and shifted in the width direction so as not to interfere with each other Since it consists of the pieces 51 and 52, even if it is intended to reduce the stress concentration at the bent portion by increasing the span of the door pressing pieces 51 and 52, the length dimension of the fixed piece 50 is not increased. Therefore, it is possible to achieve both reduction of stress concentration at the bent portion and downsizing of the spring member 5, thereby reducing the size of the table tap. Moreover, as described above, even when it is made smaller in the spring member 5, because it reduces the stress concentration at the bent portion of the spring member 5, or cause the spring member 5 is a malfunction, or by damaged door The possibility that the opening / closing operation of the part cannot be correctly performed can be reduced, and a stable opening / closing operation can be performed.

  Further, in the conventional leaf spring 100, the contact range between the door portion pressing pieces 101, 102 of the leaf spring 100 and the door portion 4 is the range indicated by d1 in FIG. Since the spring member 5 is displaced in the width direction of the pair of door pressing pieces 51 and 52, if the width dimension of the door pressing pieces is the same, the range indicated by d2 in FIG. This is the contact range between 51 and 52 and the door 4. Therefore, according to the present embodiment, as apparent from FIG. 2A, the contact range with the door portion 4 can be expanded as compared with the conventional leaf spring 100, and thus the door portion 4 is moved. In this case, it is possible to prevent the longitudinal ends of the door part 4 from rattling in the insertion / extraction direction of the plug blades P1, P2 of the plug P (the vertical direction in FIG. 2 (a)). You can do it.

  In addition, as shown in FIG. 2 (b), the spring member 5 is in a state where the pair of door pressing pieces 51 and 52 always intersect with each other, so that the door 4 is pressed by the plug blade. Accordingly, the distance d3 between the tip portions 51a and 52a of the pair of door portion pressing pieces 51 and 52 becomes longer. Therefore, when the door portion 4 is moved, the short direction of the door portion 4 is reached. Both end sides can be prevented from rattling in the insertion / extraction direction of the plug blades P1, P2 of the plug P (left and right direction in FIG. 2A), thereby enabling stable opening and closing operations.

Furthermore, as described above, when the door part 4 is moved, rattling in the insertion / extraction direction of the plug blades P1, P2 of the plug P is suppressed at both ends in the longitudinal direction and the short direction of the door part 4. Thus, the door portion 4 can be translated without being inclined with respect to the rear surface of the boss portion 30a of the integrally formed block 3, and thereby the inner packing portion 32 of the boss portion 30a with the door portion 4 being inclined. It is possible to prevent the movement of the door portion 4 from being hindered by the relatively large frictional force generated between the inner packing portion 32 and the door portion 4 in contact with the inner packing portion 32.

  By the way, as an example of the spring member 5 used for the table tap of this embodiment, it is not restricted to the shape shown to said FIG.4 (a)-(d). For example, as shown in FIGS. 8A to 8D, two spring members 5 </ b> A having a shape in which the spring member 5 is divided in the length direction (longitudinal direction) of the fixed piece 50 at the center portion of the fixed piece 50 are used. In this case, the door pressing pieces 51 may be arranged to face each other with the door pressing pieces 51 shifted in the width direction so that the door pressing pieces 51 of the spring members 5A do not interfere with each other.

  The same effect as described above can be obtained by using two spring members 5A as shown in FIGS. 8A to 8D. However, when two such spring members 5A are used. In comparison, the use of one spring member 5 as in the above example is preferable because the number of parts can be reduced.

  In addition, the spring member 5 is not limited to the one in which the pair of door pressing pieces 51 and 52 always intersect as described above, and at least when the door pressing pieces 51 and 52 are bent at the time of bending. However, if the door pressing pieces 51 and 52 are always in an intersecting state, the door pressing pieces can be used even when the span of the door pressing pieces 51 and 52 is increased. The distance between the tip portions 51a and 52a of the 51 and 52 and the fixed piece 50 can be shortened, whereby the height of the spring member can be reduced, and the spring member 5 can be further miniaturized. Become.

  In addition, the shape of the table tap is not limited to the shape as in the present embodiment, and the plug tap insertion hole is further increased, or the power is supplied between the terminal plates 2A and 2B and the power cord 7. A switch for turning on / off may be provided, and a switch suitable for the situation can be adopted.

(A) is the top view of one Embodiment of the table tap of this invention, (b) is a schematic sectional drawing in the A1-A1 line | wire of the same figure (a), (c) is the figure ( It is a schematic sectional drawing in the A2-A2 line of a). (A) is the elements on larger scale of the site | part shown by B1 in FIG.1 (c), (b) is the elements on larger scale of the site | part shown by B2 in FIG.1 (b). It is a disassembled perspective view of a table tap. (A) is a side view of the spring member, (b) is a front view of the same, (c) is a side view of the other direction of the same, and (d) is the same view (a). It is sectional drawing in the A3-A3 line | wire. (A) is a front view of the middle frame to which the spring member is fixed, (b) is a side view of the same, and (c) is a sectional view taken along line A4-A4 of FIG. (D) is a side view in the other direction of the above, and (e) is a perspective view of the same. (A) is explanatory drawing before plug insertion of a table tap, (b) is explanatory drawing during plug insertion of a table tap, (c) is explanatory drawing after plug insertion of a table tap. . (A) is a schematic explanatory drawing of the state in which the plug blade insertion hole of the table tap is closed, (b) is an operation explanatory drawing when the plug of the table tap is inserted, (c) is a plug of the table tap It is operation | movement explanatory drawing at the time of extraction. (A) is a front view which shows the other example of a spring member, (b) is a side view same as the above, (c) is a side view of the other direction same as the above, (d) It is a perspective view same as the above. (A) is a front view of the leaf | plate spring used for the conventional table tap, (b) is a side view same as the above, (c) is a rear view same as the above, (d) is same as the above. It is a side view of the other direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 22, 27 Blade receiving part 3a, 3b Plug blade insertion hole 4 Door part 5 Spring member 50 Fixed piece 51, 52 Door part press piece 6 Middle frame

Claims (3)

A casing having a pair of plug blade insertion holes into which a pair of plug blades of the plug are respectively inserted, and a blade to which the pair of plug blades of the plugs housed in the casing and inserted into the plug blade insertion holes are contact-connected. A pair of plug blade insertion holes that are interposed between the receiving portion and the pair of plug blade insertion holes and the blade receiving portion and respectively pass the pair of plug blades of the plug inserted from the plug blade insertion hole to the blade receiving portion side. A door portion that is slidably interposed in a direction inclined with respect to the insertion direction of the plug, and that opens and closes the pair of blade insertion holes; Opening and closing consisting of a spring member that is fixed at a substantially intermediate position between the pair of plug blade insertion holes in the middle frame and presses the door portion toward the blade insertion hole so that the door moves to a position to close the blade insertion hole. The spring member is bent from a single metal plate and fixed to the inner frame. Together with the extended at an acute angle direction with respect to the fixed piece from both ends in the longitudinal direction, and a pair of door portions pressing piece are offset in the width direction so as not to interfere with each other,
The door portion pressing piece is formed such that a tip portion is formed narrower than a base portion, and a portion gradually narrowing is formed between the tip portion and the base portion from the base portion side toward the tip portion side. Table tap characterized by.   The table tap according to claim 1, wherein the pair of door portion pressing pieces of the spring member intersect each other.   The middle frame is provided with a spring member fixing recess in which the spring member fixing piece is disposed, and the spring member fixing piece is provided with a locking claw that is hooked and locked to the inner surface of the recess. The table tap according to claim 1, wherein the table tap is provided.

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