JP2007087887A - Table tap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a table tap in which a bushing of a power supply cord does not rotate easily. <P>SOLUTION: Notches 7f and 7f are formed on the periphery of the waterproof bushing 7, and ribs 2Af and 2Bd as engagement projections which are inserted into the notches 7f and 7f are formed on backsides of an outside enclosure 2A and an outside body 2B. A mechanism for preventing the rotation of the waterproof bushing 7 is constituted by engaging the ribs 2Af and 2Bd to the notches 7f and 7f. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a table tap.

  As a conventional table tap, with the plug blade insertion port into which the plug blade of the plug is inserted exposed, the plug blade insertion unit in which the plug blade insertion port is formed is covered with the outer cover and the outer body, A table tap in which an opening is formed by combining notches formed on one end walls of both the outer cover and the outer body, and a power cord connected to the plug blade insertion unit is inserted into the opening via a bushing. Known (for example, Patent Document 1).

In this type of table tap, it is common to suppress the bushing from rotating by sandwiching the bushing between the outer cover and the outer body at the opening, and to prevent the bushing from coming out of the opening. is there.
JP-A-2005-203330

  However, if the bushing is simply sandwiched between the outer cover and the outer body at the opening, it may be difficult to completely prevent the bushing from rotating when a larger torsional force or the like is applied.

  Therefore, an object of the present invention is to obtain a table tap in which the bushing is more difficult to rotate.

  In the first aspect of the invention, the plug blade insertion unit in which the plug blade insertion port is formed with the outer cover and the outer body in a state where the plug blade insertion port into which the plug blade of the plug is inserted is exposed. An opening is formed by covering notches formed on both end walls of both the outer cover and the outer body, and a power cord connected to the plug blade insertion unit is inserted into the opening via a bushing. In the table tap, a notch is provided on the outer periphery of the bushing, and an engagement protrusion to be inserted into the notch is provided on the back surface of at least one of the outer cover and the outer body. The bushing is prevented from rotating by engagement with the mating protrusion.

  In the invention of claim 2, the notch portion is provided so as to make a pair with the central portion of the bushing interposed therebetween, and the engaging protrusion is provided so as to make a pair, and the engaging protrusion which makes the pair The bushing is clamped.

  According to a third aspect of the present invention, wall-like projections that form a pair are provided on the back surface of at least one of the outer cover and the outer body so as to sandwich the engaging projection inserted into the notch portion, thereby forming the pair. The bushing is sandwiched by wall-shaped protrusions.

  The invention according to claim 4 is characterized in that the engaging projection is formed by a rib extending along the back surface of at least one of the outer cover and the outer body.

  According to a fifth aspect of the present invention, a contact protrusion is provided on the back surface of at least one of the outer cover and the outer body to abut against the outer peripheral surface of the bushing, and the outer peripheral surface of the bushing and the contact protrusion are provided. The bushing is prevented from rotating by contact with the bushing.

  According to the first aspect of the present invention, since the bushing detent mechanism is configured by the engagement between the notch provided on the outer periphery of the bushing and the engagement protrusion inserted into the notch, the bushing is more reliably rotated. Can be suppressed.

  According to invention of Claim 2, a bushing can be clamped by the engaging protrusion which makes a pair, and rotation of a bushing can be suppressed much more reliably.

  According to the invention of claim 3, by pinching the bushing by the pair of wall-shaped protrusions, the rotation of the bushing can be further reliably suppressed, and the engagement between the engagement protrusion and the notch portion is prevented. Since the release can be suppressed, there is an advantage that the rotation suppression effect can be further enhanced.

  According to the invention of claim 4, since a part of the rib capable of improving the rigidity and strength of the outer cover or the outer body is used as the engaging protrusion, the configuration is simplified as compared with the case where these are separately provided. There is an advantage that the manufacturing cost can be reduced.

  According to the fifth aspect of the present invention, the rotation of the bushing can be more reliably suppressed by abutting the contact protrusion against the outer peripheral surface of the bushing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  (First Embodiment) FIGS. 1 to 6 show a first embodiment of a waterproof structure of a switch device according to the present invention, FIG. 1 is a perspective view of a table tap, FIG. 2 is an exploded perspective view of a table tap, 3 is a perspective view of the bushing, FIG. 4 is a view of the bushing viewed from various directions, FIG. 5 is a plan view and a cross-sectional view of an end portion where the bushing of the outer cover is mounted, and FIG. 6 is a bushing of the outer body FIG. 7 is a sectional view of the bushing and the housing, and is a longitudinal sectional view corresponding to the AA line in FIG. 5 and the BB line in FIG. 6, FIG. These are sectional drawings of a bushing and a housing, Comprising: It is a longitudinal cross-sectional view in the position of the back | inner side (table tap inner side) rather than FIG.

  As shown in FIGS. 1 and 2, the waterproof structure of the switch device according to the present embodiment will be described by way of example when applied to a table tap 1 as an electric device. The upper part in the figure is the upper member and the upper position, the lower part in the figure is the lower member and the lower position, and the left and right direction left and right positions in the figure, but in particular the positional relationship between the upper and lower and the left and right It does not specify.

  As shown in FIG. 1, the table tap 1 includes a housing 2 formed into a hollow having a substantially rectangular cross section by an outer cover 2 </ b> A and an outer body 2 </ b> B, and a plug blade of an unillustrated plug on the upper surface 2 c of the housing 2. A plurality (two in the present embodiment) of insertion units 3 are provided at appropriate intervals in the length direction of the housing 2, and one plug blade insertion unit 3 is also provided on the distal end surface 2 d of the housing 2.

  Further, a switch 10 for on / off switching is provided on the base end side (the other side in FIG. 2) of the upper surface 2c of the housing 2, and electricity supplied from the power cord 4 by switching of the switch 10 is The plug blade insertion unit 3 is energized and cut off.

  Here, in this embodiment, the switch 10 is provided as a waterproof switch provided with the waterproof packing 20.

  As shown in FIG. 2, the detailed internal structure of the table tap 1 includes an intermediate body 5, a blade receiver 6, and a plug blade insert between an outer cover 2A and an outer body 2B which are divided into upper and lower parts. A waterproof bushing 7 is attached to a portion in which the unit 3 and the switch 10 are built and the power cord 4 is inserted into the housing 2.

  The outer cover 2A is formed in a substantially inverted U-shape with a shallow section with the lower part opened, and an opening 2Aa is formed on the upper surface 2c so that the plug blade insertion port 3a of the plug blade insertion unit 3 faces upward. At the same time, a mounting opening 2Ab is formed in which the switch 10 is fitted and attached. Further, a U-shaped notch 2Ac that faces the plug blade insertion port 3a of the plug blade insertion unit 3 is also formed on the distal end surface 2d of the outer cover 2A.

  The outer body 2B is formed in a shallow U-shaped shallow section with its upper part opened, and a screw mounting hole 2Ba is formed through which a plurality of assembly screws 8 (three in this embodiment) are inserted in the length direction. The outer cover 2A and the outer body 2B are coupled to each other through an assembly screw 8 inserted through the screw mounting hole 2Ba. Further, a cutout 2Bi that forms a rectangular opening together with the cutout 2Ac of the outer cover 2A is formed on the distal end surface 2d of the outer body 2B.

  In addition, ribs (2Bb or the like) are provided in a lattice shape on the back surfaces of the outer cover 2A and the outer body 2B to improve rigidity and strength. The rib 2Bb of the outer body 2B and the rib (not shown in FIG. 2) of the outer cover 2A are formed with cutouts along the outer shapes of the side wall 5a and the bottom surface 5b of the middle body 5. Can be stably fitted and supported.

  Further, notches 2Ag (see FIG. 5) and 2Bc for taking in the power cord 4 are formed between the base end side walls of the outer cover 2A and the outer body 2B, and the power cord 4 is formed in these notches 2Ag and 2Bc. The waterproof bushing 7 inserted through is fitted and locked. When the outer cover 2A and the outer body 2B are assembled, the notch 2Ag of the outer cover 2A and the notch 2Bc of the outer body 2B are combined to form a substantially rectangular opening through which the waterproof bushing 7 is inserted. The

  The middle body 5 is a case for holding the blade receiver 6 and is formed in a U-shaped cross section with its upper portion and front end (front side in the figure) released, and a plurality of inner bodies 5 for fitting and holding the blade receiver 6 therein. 5c, and an opening 5d through which the assembly screw 8 is inserted is formed at the center of the bottom surface 5b.

  The blade receiver 6 includes two conductive band plates 6a and 6b arranged in the width direction (left and right direction) of the housing 2, and plug blades of plugs are provided at intermediate portions of the conductive band plates 6a and 6b. Two blade receiving springs 6c sandwiched with elastic force are provided at predetermined intervals, and one similar blade receiving spring 6c is provided at each tip portion (front side in FIG. 2) of the conductive strips 6a and 6b. .

  And each blade receiving spring 6c is arrange | positioned at the plug blade insertion port 3a provided in the plug blade insertion unit 3 at two places, respectively. Each plug blade insertion unit 3 has a waterproof structure in which a waterproof door (not shown) can be freely opened and closed at each plug blade insertion port 3a.

  Further, the base end portions (the other side in FIG. 2) of the conductive strips 6 a and 6 b are connection end portions 6 d and 6 e connected to the switch 10.

  The switch 10 includes an operation unit 11 that is operated to swing, and a switch case 12 that supports the central part of the operation unit 11 so as to be swingable. The switch 10 is turned on and off by a swing operation of the operation unit 11. It constitutes a tumbler switch, and is mounted with the operation portion 11 facing outward from the mounting opening 2Ab of the housing 2.

  The switch 10 includes two input terminals (not shown) to which the two cords 4a and 4b of the power cord 4 are connected to the other side in FIG. 2, and two output terminals 13a and 13b protruding to the front side in FIG. And the operation unit 11 is turned on, that is, the side provided with the projection 11a is pushed downward as shown in FIG. 2 to energize the power supplied from the power cord 4 to the output terminals 13a and 13b. On the other hand, the operation unit 11 is turned off, that is, the electric power supplied from the power cord 4 is cut off by pushing the opposite side of the projection 11a downward, and the output terminals 13a and 13b are energized. Not to be.

  The output terminals 13a and 13b are connected to the corresponding connection ends 6d and 6e of the blade receiver 6, respectively. When the switch 10 is turned on, each plug blade insertion unit 3 is energized, while the switch 10 is turned off. Each plug blade insertion unit 3 is in a non-energized state.

  As shown in FIG. 2, the assembly of the table tap 1 configured in this way is to set the middle body 5 holding the blade receiver 6 in the outer body 2 </ b> B, set the switch 10, and The blade insertion unit 3 corresponding to each blade receiving spring 6c is arranged, while the waterproof packing 20 is temporarily fixed inside the peripheral edge of the mounting opening 2Ab of the outer cover 2A, and the outer cover 2A is attached to the outer cover 2A. The outer body 2 </ b> B and the outer cover 2 </ b> A are coupled by the assembly screw 8.

  Here, as shown in FIGS. 3 and 4, the waterproof bushing 7 basically has a configuration in which a flange portion 7 a is provided on the peripheral edge on the open side of the bottomed and elliptical cylindrical portion 7 b. Furthermore, at the connection boundary between the cylindrical portion 7b and the flange portion 7a, a base end portion of the cylindrical portion 7b is protruded in the radial direction by a certain width and a certain height so as to form an annular protruding portion 7e. It is provided. An annular groove is appropriately formed on the outer periphery of the tubular portion 7b to enhance flexibility.

  A long hole-like through hole 7d is provided at the bottom of the cylindrical portion 7b, and the power cord 4 is introduced into the cylindrical interior 7c of the cylindrical portion 7b via the through hole 7d. Are extended toward the switch 10 and connected. At this time, the through-hole 7d is formed to be slightly smaller than the outer shape of the power cord 4 so that the power cord 4 is inserted into the through-hole 7d, and the seal is sealed by the elastic force of the waterproof bushing 7 in this portion. It is ensured.

  Further, a cutout portion 7f that opens toward the outer peripheral side and the bottom side of the tubular portion 7b (see FIG. 7 for the cutout portion 7f on the back surface side) is formed above and below the overhang portion 7e.

  Further, flat surfaces 7g and 7i are formed on the outer periphery of the flange portion 7a. In the present embodiment, the flange portion 7a has a shape including bulging portions 7h, 7h in which the central portion of the long side of the substantially rectangular outer peripheral shape is bulged up and down with a relatively large curvature radius, It has a flat side surface 7i corresponding to the short side of the rectangular outer peripheral shape, and flat surfaces 7g on both sides (four places in total) of the upper and lower bulging portions 7h, 7h.

  Further, as shown in FIG. 5, the outer cover 2A is provided with a configuration for locking the waterproof bushing 7 in an appropriate posture.

  Specifically, in the present embodiment, the ribs 2Af and 2Ai extending along the longitudinal direction are erected on the back surface side (inner side of the housing) from the longitudinal center portion of the top wall portion 2Ad, and on both sides thereof. A pair of ribs 2Ae and 2Ah are provided in parallel at a predetermined interval (on the left and right sides in FIG. 5).

  Here, as shown in FIG. 7, the pair of ribs 2Ae, 2Ae is higher than the rib 2Af at the center and extends to the vicinity of the boundary with the outer body 2B. As shown in FIGS. 7 and 8, the ribs 2Ai and 2Ah arranged on the inner side in the longitudinal direction are both lower than the ribs 2Af and 2Ae arranged adjacent to each other in the longitudinal direction.

  On the other hand, as shown in FIG. 6, the outer body 2B is also provided with a configuration for locking the waterproof bushing 7 in an appropriate posture.

  Specifically, in the present embodiment, the ribs 2Bd and 2Bh extending along the longitudinal direction are erected from the center portion in the longitudinal direction of the bottom wall portion 2Bf to the back side (inner side of the housing), and both sides thereof are erected. A pair of ribs 2Be and 2Bg are provided in parallel at a predetermined interval (on the left and right sides in FIG. 6).

  Here, as shown in FIG. 7, the pair of ribs 2Be, 2Be is higher than the rib 2Bd at the center and extends to the vicinity of the boundary with the outer cover 2A. As shown in FIGS. 7 and 8, the ribs 2Bh and 2Bg arranged on the inner side in the longitudinal direction are both lower than the ribs 2Bd and 2Be arranged adjacent to each other in the longitudinal direction.

  In the above configuration, when the outer cover 2A and the outer body 2B are joined as described above, and the waterproof bushing 7 is sandwiched between the outer cover 2A and the outer body 2B, as shown in FIG. A state in which the rib 2Af of the outer cover 2A and the rib 2Bd of the outer body 2B bite into the notches 7f and 7f provided in the portion 7e, and the rotation of the waterproof bushing 7 around the axis is restricted by the ribs 2Af and 2Bd. It becomes. In other words, in the present embodiment, the notch portions 7f and 7f provided on the outer periphery of the waterproof bushing 7 and the ribs 2Af and 2Bd inserted into the notches 7f and 7f form a rotation preventing mechanism for the waterproof bushing 7. Therefore, in the present embodiment, the ribs 2Af and 2Bd correspond to “engagement protrusions” according to the present invention.

  Similarly, as shown in FIG. 7, the rib 2Ae of the outer cover 2A and the rib 2Be of the outer body 2B are abutted with each other to form a pair of substantially continuous side walls, and the waterproof bushing 7 is formed in the pair of side walls. The overhanging portion 7e is substantially clamped. With this configuration, the lateral displacement of the waterproof bushing 7 with respect to the housing 2 is suppressed, and the relative displacement between the notches 7f and 7f and the ribs 2Af and 2Bd is suppressed, and the anti-rotation effect of the waterproof bushing 7 is improved. is doing. Therefore, in the present embodiment, the ribs 2Ae and 2Be correspond to “wall-shaped protrusions” according to the present invention.

  Further, as shown in FIG. 8, the front ends of the ribs 2Ah of the outer cover 2A or the ribs 2Bg of the outer body 2B are abutted substantially perpendicularly to the flat surfaces 7g formed at the four upper and lower portions of the flange portion 7a. The flange portion 7a is sandwiched between the rib 2Ah and the rib 2Bg on both sides of the waterproof bushing 7. In other words, in the present embodiment, the waterproof bushing 7 and the ribs 2Ah and 2Bg abutted against the outer peripheral surface of the waterproof bushing 7 also form a detent mechanism for the waterproof bushing 7. Therefore, in the present embodiment, the ribs 2Ah and 2Bg correspond to the “contact protrusion” according to the present invention.

  A rib (not shown) is extended vertically from at least one of the outer cover 2A and the outer body 2B along the flat surface 7i on the side of the flange portion 7a of the waterproof bushing 7, and this rib is extended to the flat surface 7i. An anti-rotation mechanism may be formed by abutting against.

  In this case, if the rib is further brought into contact with each of the pair of flat surfaces 7i and the flange portion 7a of the waterproof bushing 7 is sandwiched from the side by the pair of ribs, the rotation preventing function is further enhanced. Can be strengthened.

  According to the present embodiment described above, the engagement of the waterproof bushing 7 with the notches 7f provided on the outer periphery of the waterproof bushing 7 and the ribs 2Af and 2Bd as the “engagement protrusions” inserted into the notch 7f. Since the anti-rotation mechanism is configured, the rotation of the waterproof bushing 7 can be more reliably suppressed.

  Here, in this embodiment, the notch 7f is formed in the overhanging portion 7e provided at the connection boundary between the flange 7a and the tubular portion 7b, so that the rigidity and strength at the connection boundary can be improved. In addition, it is possible to suppress a decrease in rigidity and strength due to the provision of the notch 7f.

  Further, according to the present embodiment, since the waterproof bushing 7 can be sandwiched by the ribs 2Af and 2Bd as the “engagement protrusions” that make a pair, the waterproof bushing 7 can be more reliably prevented from rotating. it can.

  In the above embodiment, only one pair of the ribs 2Af and 2Bd facing each other is provided. However, a plurality of pairs of the ribs 2Af and 2Bd may be provided. May be sandwiched.

  Moreover, according to this embodiment, by pinching the waterproof bushing 7 with the ribs 2Ae and 2Be as a pair of “wall-like projections”, the rotation of the waterproof bushing 7 can be further reliably suppressed. There is an advantage that the effect of suppressing the rotation can be further enhanced by the fact that the engagement between the ribs 2Af and 2Bd as the “engagement protrusions” and the notches 7f and 7f can be prevented from being released.

  In addition, according to the present embodiment, the ribs 2Ah and 2Bg as “abutting protrusions” are abutted against the outer peripheral surface of the waterproof bushing 7, whereby the rotation of the waterproof bushing 7 can be further reliably suppressed.

  In this case, a flat surface 7g is formed on a part of the outer surface of the waterproof bushing 7, and the ribs 2Ah and 2Bg are abutted against the flat surface 7g, so that the waterproof bushing 7 is abutted against the curved outer peripheral surface. Can be more reliably suppressed.

  Further, according to the present embodiment, the waterproof bushing 7 can be sandwiched between the ribs 2Ah and 2Bg as the “abutting protrusions” that make a pair, and the rotation of the waterproof bushing 7 can be more reliably suppressed. it can.

  Further, according to the present embodiment, a part of the ribs 2Af, 2Bd, 2Ae, 2Be, 2Ah, 2Bg capable of improving the rigidity and strength of the outer cover 2A or the outer body 2B is applied to the “engagement” Since it was used as a `` protrusion '', `` wall-like protrusion '', or `` contact protrusion '', compared to the case where these `` engaging protrusion '', `` wall-like protrusion '', or `` contact protrusion '' are provided separately from the rib, There is an advantage that the configuration can be simplified and the manufacturing cost can be reduced.

  In this embodiment, as will be apparent from FIGS. 7 and 8, all of these “engagement protrusions”, “wall-like protrusions”, and “contact protrusions” are in the same direction (vertical direction; front and back). Since it is formed as a protrusion that protrudes substantially parallel to (direction), there is an advantage that it can be formed very easily by resin molding using a mold.

  By the way, although this invention was demonstrated taking the example to the said embodiment, various other embodiment can be employ | adopted in the range which is not restricted to these embodiments and does not deviate from the summary of this invention.

The perspective view of the table tap concerning the embodiment of the present invention. The disassembled perspective view of the table tap concerning embodiment of this invention. The perspective view of the bushing contained in the table tap concerning embodiment of this invention. The top view (a) of the bushing contained in the table tap concerning embodiment of this invention, a side view (b), and a front view (c). The top view (b) and sectional drawing ((a); AA sectional drawing of FIG.5 (b)) of the edge part which mounts the bushing of the outer cover contained in the table tap concerning embodiment of this invention. The top view (a) and sectional drawing ((b); BB sectional drawing of Fig.6 (a)) of the edge part which mounts the bushing of the outer body contained in the table tap concerning embodiment of this invention. It is sectional drawing of the bushing and housing which are contained in the table tap concerning embodiment of this invention, Comprising: The longitudinal cross-sectional view corresponding to the AA line of FIG. 5, and the BB line of FIG. It is sectional drawing of the bushing and housing which are included in the table tap concerning embodiment of this invention, Comprising: The longitudinal cross-sectional view in the back | inner side (table tap inner side) position rather than FIG.

Explanation of symbols

1 Table tap 2A Outer cover 2Ae, 2Be Rib (wall projection)
2Af, 2Bd rib (engagement protrusion)
2Ag, 2Bc Notch (Notch)
2Ah, 2Bg rib (contact protrusion)
2B Outer body 3 Plug blade insertion unit 3a Plug blade insertion port 4 Power cord 7 Waterproof bushing (bushing)
7f, 7f Notch 7g Flat surface

Claims (5)

Cover the plug blade insertion unit in which the plug blade insertion port is formed with the outer cover and the outer body in a state where the plug blade insertion port into which the plug blade of the plug is inserted is exposed. In a table tap in which an opening is formed by combining notches formed on both end walls, and a power cord connected to the plug blade insertion unit is inserted into the opening through a bushing,
A notch is provided on the outer periphery of the bushing,
On the back surface of at least one of the outer cover and the outer body, an engagement protrusion to be inserted into the notch is provided,
A table tap, characterized in that a non-rotating mechanism for the bushing is formed by engagement between the notch and the engagement protrusion. The notch portion is provided so as to make a pair with the central portion of the bushing interposed therebetween, and the engaging protrusion is provided so as to make a pair,
The table tap according to claim 1, wherein the bushing is clamped by the pair of engaging protrusions. On the back surface of at least one of the outer cover and the outer body, a pair of wall-shaped protrusions are provided with an engagement protrusion inserted into the notch,
The table tap according to claim 1, wherein the bushing is sandwiched between the pair of wall-shaped protrusions.   The table tap according to any one of claims 1 to 3, wherein the engagement protrusion is formed by a rib extending along a back surface of at least one of the outer cover and the outer body. Provided on the back surface of at least one of the outer cover and the outer body is an abutting protrusion that abuts against the outer peripheral surface of the bushing;
The table tap according to any one of claims 1 to 4, wherein a detent mechanism for the bushing is configured by contact between an outer peripheral surface of the bushing and the contact protrusion.

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