JP2018196925A - Driver bit and driver bit for grating lid - Google Patents

Abstract

To provide a driver bit which can suitably fasten a screw, which is larger than a size restricted by a clearance such as a slit, and release fastening thereof against such a fact that a size (size of a nominal diameter) of a screw is restricted by said clearance.SOLUTION: A tip fitting part 61, which is substantially cross-shaped, is so configured that by omitting each cutting part 71 along only an opposite direction of one groove part pair 72a, a width t1 in said one opposite direction becomes shorter than a width t2 in an opposite direction of the other groove part pair 72b, and further, a rotary shaft part 63 comprises a small diameter part 63b having an outer diameter which is the width t1 or smaller in one opposite direction. According to such a configuration, the tip fitting part 61 and the small diameter part 63b can be inserted in a clearance such as a slit, and therefore, a screw, which is positioned on a deeper side of the slit and has a size larger than a clearance of the slit, can be suitably driven.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a driver bit used for tightening or releasing a screw (or bolt) having a cross groove on a screw head, and a driver bit for a grating lid used for connecting a grating lid and a lid receiving frame. .

  For tightening or releasing the tightening of a screw (bolt) having a cross groove on the screw head, a Phillips screwdriver having a cross-shaped tip fitting portion that can be fitted into the cross groove of the screw head is used. Such a Phillips screwdriver includes a driver bit including the cross-shaped tip fitting portion and a rotating shaft portion coupled to the rear end of the tip fitting portion (see, for example, Patent Document 1).

  On the other hand, a screw (bolt) having a cross groove on a screw head has been conventionally used for connecting various structural members, and a screw having a desired size is used according to the application. Here, in general, the larger the diameter of the screw shaft portion (nominal diameter of the screw), the stronger the tightening force and the higher the holding force in the tightened state. As the nominal diameter of the screw shaft portion becomes thicker, the screw head becomes larger and the cross groove of the screw head becomes larger. In order to tighten and release such a screw, a Phillips screwdriver (driver bit) having a tip fitting portion of a size that fits the cross groove of the screw is used. Thereby, the screw can be tightened with an appropriate strength and the tightening can be released. If a Phillips screwdriver with a size smaller than the cross groove is used, it cannot be tightened with a sufficient force, but the groove is crushed by a screwing operation because the fitting with the cross groove is loose. There is also a fear.

  By the way, the mounting position of the screw described above is not always at a position where the tightening operation or the like can be easily performed, but may be at the back of a gap such as a slit. The screw located at the back of the gap needs to be screwed by inserting a tip fitting portion of a plus driver (driver bit) from the gap. Here, since the Phillips screwdriver is composed of the driver bit composed of the cross-shaped tip fitting portion and the rotating shaft portion as described above, the tip fitting portion and the rotating shaft portion of the driver bit are connected to each other. A size that can be inserted into the gap is used. For this reason, a screw that fits in a plus screwdriver that can be inserted into the gap is used as the screw that is attached to the depth position of the gap.

  On the other hand, a grating lid provided with a plurality of main bars arranged in parallel at a predetermined interval is known as a groove lid that covers an upper opening of a groove such as a drainage groove. The grating lid is mounted on a lid receiving frame disposed in the upper part of the groove, and is detachably fixed to the lid receiving frame by a screw having the above-described cross groove on the screw head (for example, Patent Documents). 2). Here, the grating lid and the lid receiving frame are fixed by connecting a pair of connecting portions arranged vertically below the grating lid with the above-described screws. Therefore, in the construction work and maintenance work of such a grating lid and lid receiving frame, the tip fitting part of the above-mentioned plus driver (driver bit) is inserted from above into the gap between the main bars of the grating lid, The screw was tightened or released.

Japanese Patent Laid-Open No. 2014-223711 Japanese Patent Laid-Open No. 2005-30042

  As described above, in the structure in which the screw is installed at the back of the gap such as the slit, a screw having a size suitable for a plus driver (driver bit) that can be inserted into the gap is used. Many of the structures have a relatively narrow gap, and in the case of such a narrow gap, a screw having a relatively small nominal diameter is used in accordance with a Phillips screwdriver that can be inserted into the gap. For example, if the gap such as the slit is 6 mm, use a Phillips screwdriver (nominal number = 2) with an outer diameter of the tip fitting part and the rotating shaft part smaller than 6 mm. Used M3-M5 screws. However, such a screw having a small nominal diameter has a relatively weak tightening force and a holding force in a tightened state as described above, and therefore cannot cope with a case where a stronger tightening force and a holding force are required. was there. If a screw with a larger nominal diameter than a size suitable for a Phillips screwdriver that can insert a gap such as a slit is used, the desired tightening force and holding force can be obtained if the screwdriver can be tightened properly. However, as described above, it is not only difficult to stably carry out proper tightening, but also there is a possibility of causing problems such as crushing the cross groove.

  Further, even for the screw used for fixing the grating lid and the lid receiving frame described above, the size of the screw is selected in accordance with the plus driver that can be inserted into the gap between the main bars of the grating lid. However, such a grating lid is required to be more firmly fixed to the lid receiving frame because it is subjected to a relatively strong impact when a vehicle or a person passes through the grating lid when it is installed. However, in order to meet this requirement, although it is required to fix with a screw having a large nominal diameter as described above, the size of the screwdriver (driver bit) that performs the tightening operation is limited by the distance between the main bars. Therefore, there is a limit to the size of screws that can be used. As described above, if a screw larger than a size suitable for a Phillips screwdriver that can be inserted into the main bar interval is used, there is a concern that proper tightening is difficult to be performed stably and the cross groove is crushed. .

  Thus, in the past, the size of the screw (size of the nominal diameter) was limited by a gap such as a slit, but the present invention properly tightens and tightens a screw larger than the size limited by this gap. The present invention proposes a driver bit that can be unfastened and a driver bit for a grating lid.

  The first invention of the present invention is formed in a substantially cross shape by four blade portions provided at intervals of 90 degrees in the circumferential direction and two pairs of groove portions provided between adjacent blade portions. A tip fitting portion fitted in the cross groove of the screw head, a base portion attached to the driver grip, and a rod-shaped rotating shaft portion provided between the tip fitting portion and the base portion. In the screwdriver bit, the tip fitting portion is configured such that each blade portion is removed only along the facing direction of the one groove portion pair so that the width in the facing direction of the one groove portion pair becomes the other groove portion pair. The rotation shaft portion is provided with a predetermined length from the front end that is continuous with the tip fitting portion, and is equal to or less than the width in the facing direction of the one groove portion pair. A driver bit characterized by having a small diameter part consisting of an outer diameter. That.

  In such a configuration, the width in the facing direction of one groove portion pair (hereinafter referred to as the first groove facing width) is shorter than the width in the facing direction of the other pair of groove portions (hereinafter referred to as the second groove facing width). Therefore, even if the slits are narrower than the second groove facing width, the tip fitting portion and the small diameter portion can be inserted as long as the spacing is wider than the first groove facing width. The tip fitting portion can be rotated. Furthermore, since the front end fitting portion of this configuration is formed by removing each blade portion only along the facing direction of one groove portion pair, it corresponds to the facing direction of the other groove portion pair of each blade portion. The part is the same as the tip fitting portion (not removed) of a general Phillips screwdriver. Therefore, the tip fitting portion of this configuration can be fitted in the cross groove of the screw head suitable for the tip fitting portion of a general Phillips screwdriver in the same manner as the common tip fitting portion. The screw having the portion can be appropriately screwed. In other words, this configuration is more suitable than a gap such as a slit as long as the screw has a nominal diameter that can be properly screwed by the tip fitting portion of a general Phillips screwdriver having the same width in the opposite direction as the second groove facing width. Even with a large size screw, the gap between the tip fitting portion and the small diameter portion of this configuration can be inserted into the gap, so that the screw head can be stably tightened and unfastened, and at the time of the tightening It is possible to suppress the crushing of the cross groove as much as possible. Therefore, a screw with a larger nominal diameter than the size previously limited by a gap such as a slit can be used according to this configuration, and it fully responds to the demand for stronger tightening force and holding force. it can.

  According to a second aspect of the present invention, a pair of couplings in which a grating lid provided with a plurality of main bars arranged in parallel at a predetermined interval and a lid receiving frame disposed at an upper portion of the groove are arranged vertically below the main bar. It is used for the operation of connecting and disconnecting via a part, for connecting a pair of connecting parts, and for connecting a screw with a cross groove on the screw head, for screwing operation, It is formed in a substantially cross shape by four blade portions provided at intervals of 90 degrees in the circumferential direction and two pairs of groove portions provided between adjacent blade portions and facing each other. A driver bit for a grating lid comprising a tip fitting portion fitted in the groove, a base portion attached to the driver grip, and a rod-shaped rotating shaft portion provided between the tip fitting portion and the base portion. In the above, the tip fitting portion is configured so that each blade portion has one side. By removing only along the facing direction of the pair of parts, the width in the facing direction of the one pair of groove parts is made shorter than the width in the facing direction of the other pair of groove parts. The width in the opposite direction is formed shorter than the interval between the adjacent main bars of the grating lid, and the rotating shaft portion is provided with a predetermined length from the front end coupled to the tip fitting portion, A narrow-diameter portion having an outer diameter equal to or smaller than the width in the opposing direction of the pair of groove portions, and the outer diameter of the narrow-diameter portion is shorter than the interval between adjacent main bars of the grating lid, and A driver bit for a grating lid, characterized in that the length is longer than the vertical width of the main bar.

In this configuration, the above-described driver bit according to the first invention is applied as a dedicated one for fixing the grating lid to the lid receiving frame.
That is, in this configuration, since the width in the facing direction of one pair of groove portions (hereinafter referred to as the first groove facing width) is shorter than the main bar interval, the tip fitting portion and the small diameter portion are adjacent to each other in the main bar. It can be inserted from the gap, and the tip fitting portion can be rotated below the main bar by positioning the small diameter portion in the gap. Here, even if the width in the facing direction of the other pair of groove portions (hereinafter referred to as the second groove facing width) is longer than the main bar interval, the tip fitting portion can be rotated as described above. Further, even in this configuration, similarly to the first invention described above, a screw suitable for a tip fitting portion of a general Phillips screwdriver (not removed along the facing direction of one groove pair) It can be fitted into the cross groove of the head in the same manner as the general tip fitting portion, and the screw having the screw head can be appropriately screwed. For this reason, this configuration is a screw with a nominal diameter that can be properly screwed by the tip fitting portion of a general Phillips screwdriver that has the same width in the opposite direction as the width across the second groove. Can be inserted into the gap between adjacent main bars with the tip fitting portion and the small diameter portion of the present configuration, so that the screws can be stably tightened below the main bar. The tightening can be released, and the cross groove of the screw head can be prevented from being crushed as much as possible. Therefore, a screw having a larger nominal diameter than that conventionally limited by the gap between adjacent main bars can be used according to this configuration, and the grating lid can be used as a lid receiving frame with a stronger tightening force and holding force. Can be consolidated.

  According to the driver bit of the first invention of the present invention, it is possible to suitably use a screw located at the back of a gap such as a slit for tightening and untightening, and a nominal diameter larger than the size conventionally limited by the gap. The screw can be tightened and unfastened appropriately and stably, and the cross groove of the screw can be suppressed as much as possible. Therefore, according to the structure of this invention, it can fully respond to the request | requirement which asks for stronger clamping force and holding force.

  According to the driver bit for the grating lid of the second invention of the present invention, a screw having a larger nominal diameter than that conventionally limited by the distance between the main bars can be appropriately and stably tightened and released, Crushing the cross groove of the screw can be suppressed as much as possible. Therefore, according to the configuration of the present invention, the grating lid can be fixed to the lid receiving frame with a stronger tightening force and holding force.

It is a longitudinal cross-sectional view which shows the construction state of the water-flow covering apparatus 11 for grooves. It is a top view of the water flow covering apparatus 11 for grooves. (A) The top view which shows the state in which the connection piece 39 of the locking device 36 exists in an advance position, (B) The top view which shows the state in which the connection piece 39 exists in a retracted position. FIG. 5 is an enlarged longitudinal sectional view showing a state in which the grating lid 13 and the lid receiving frame 12 are consolidated by a connecting screw 45 having a cross groove 48 formed in a screw head 46. It is the (A) top view and (B) front view of the connection screw 45. It is (A) front view and (B) top view of the Phillips screwdriver 51 provided with the driver bit 52 of a present Example. It is the (A) front view and (B) top view which expand and show the front-end | tip fitting part 61 of the plus driver 51 same as the above. It is the enlarged view which looked at the front-end | tip fitting part 61 of the driver bit 52 same as the above from the front end side. It is the XX sectional view taken on the line in FIG. It is explanatory drawing which shows the usage condition of the plus driver 51 of a present Example. It is explanatory drawing which shows the usage condition which continues from FIG. It is explanatory drawing which shows the retracted position of the connection piece 39 in the movement operation by the plus driver 51. FIG. It is explanatory drawing which shows the screwing operation of the connection piece 39 by the Phillips screwdriver 51 in the advance position. It is explanatory drawing which shows the screwing operation of the connection piece 39 by the Phillips screwdriver 51. FIG.

  Embodiments according to the present invention will be described with reference to the accompanying drawings. First, the waterway covering device 11 for a groove that is a target using the plus driver 51 according to the present invention will be described.

  The groove 1 is constructed by embedding a plurality of groove members 2 composed of U-shaped grooves formed in a substantially U-shaped cross section in a row at a predetermined depth position on the ground. And as shown in FIG. 1, the waterway covering apparatus 11 for grooveways which covers the upper opening so that waterflow is possible is arrange | positioned at the grooveway 1. FIG.

  As shown in FIGS. 1 and 2, the water channel covering device 11 for a groove is mounted on the lid receiving frame 12 fixed to the left and right side walls 4 a and 4 b constituting the groove 1, and the lid receiving frame 12. And a grating lid 13. The lid receiving frame 12 includes left and right support frames 15a and 15b and a plurality of connecting beams 16 that connect both the support frames 15a and 15b, and one support frame 15a is mounted on the side wall 4a. And a vertical piece portion 22a that rises vertically from the outer edge of the horizontal piece portion 21a. The horizontal piece portion 21a has substantially the same width as the upper surface width of the side wall 4a. The other support frame 15b is composed of a wide horizontal piece 21b whose outer end is mounted on the side wall 4b, and a vertical piece 22b that stands vertically from the inner edge of the horizontal piece 21b. The vertical piece 22 b is disposed at the upper part of the groove 1. The other support frame 15b has a vertical piece 22b arranged opposite to the vertical piece 22a of the one support frame 15a at a predetermined interval, and is positioned closer to one side wall 4a of the groove 1. A water passage 9 is formed between the two vertical pieces 22a and 22b arranged in this way, and the upper opening of the groove 1 excluding the water passage 9 is shielded by the horizontal piece 21b of the other support frame 15b. ing.

  Both the support frames 15a and 15b are formed using a plate-like metal material made of steel or stainless steel as a raw material, and the length thereof is a predetermined value corresponding to the longitudinal direction of the plurality of groove members 2 in a line. It has become the length. The support frames 15a and 15b may be formed by bending the horizontal piece portions 21a and 21b and the vertical piece portions 22a and 22b into a L-shaped cross section of one metal plate, or two pieces. The metal plate may be joined by welding so as to have an L-shaped cross section.

  The left and right support frames 15a and 15b are connected by a plurality of connecting beams 16 arranged at predetermined intervals in the longitudinal direction of the support frames 15a and 15b. Each connecting beam 16 is formed of a metal square pipe having excellent strength, and is formed with a predetermined length slightly longer than the width between the outer side surfaces 5 and 5 of the left and right side walls 4a and 4b constituting the groove 1. . Each connecting beam 16 is disposed in contact with the upper surfaces of the horizontal pieces 21a and 21b of the support frames 15a and 15b, and has through holes (open holes) formed in the vertical pieces 22a and 22b of the support frames 15a and 15b, respectively. In a state where it penetrates (not shown), it is joined by welding to the upper surface of the horizontal piece portions 21a, 21b or the horizontal piece portions 21a, 21b and the hole edge of the through hole. The left and right ends of the connecting beams 16 that connect the left and right support frames 15a and 15b so as not to move are placed on the side walls 4a and 4b of the groove 1 so that the horizontal pieces 21a of the support frames 15a and 15b are connected. , 21b.

  Fixing rods 17, 17 joined by welding to both ends of each connecting beam 16 are slightly outward from the outer surfaces 5, 5 of the side walls 4 a, 4 b of the groove 1, and are attached to the outer surfaces 5, 5. Each of them is suspended downward along the line. Fixing screws 18, 18 whose tips are press-contactable to the outer surfaces 5, 5 of the side walls 4 a, 4 b of the groove 1 are screwed into the fixing rods 17, 17 from the outside. Then, the fixing screws 18 and 18 are screwed in the tightening direction so that the distal ends of the fixing screws 18 and 18 are brought into pressure contact with the outer surfaces 5 and 5 of the side walls 4a and 4b. Thus, the left and right support frames 15 a and 15 b and the connecting beam 16 are fixed to the side walls 4 a and 4 b of the groove 1. In such a fixed state, a pavement material (not shown) made of concrete and decorative tiles is laid continuously on the horizontal piece portion 21b of the other support frame 15b on the upper periphery of the groove 1 in a continuous manner. Yes.

  The left and right support frames 15a and 15b are provided with a plurality of mounting beams 26 at predetermined intervals in the longitudinal direction between the vertical pieces 22a and 22b. Each mounting beam 26 is made of a metal square pipe, and both ends thereof are fitted into mounting holes (not shown) formed in the vertical pieces 22a and 22b, respectively. It is joined to the hole edge via welding. The mounting beam 26 is used to mount the above-described grating lid 13. When the grating lid 13 is mounted, the upper surface of the grating lid 13 is the vertical pieces 22 a and 22 b of the support frames 15 a and 15 b. The vertical arrangement positions are determined so as to be substantially the same height position as the upper end of each of the vertical pieces 22a and 22b. Further, a plurality of such mounting beams 26 are arranged in the longitudinal direction at predetermined intervals shorter than the length of the grating lid 13 so as to support a plurality of grating lids 13.

  On the other hand, the above-described grating lid 13 is mounted on the above-described mounting beam 26 and covers the water-flowing portion 9 formed between the opposing vertical piece portions 22a and 22b, as shown in FIGS. To do. The grating lid 13 is formed of a metal material made of steel or stainless steel, and includes a plurality of main bars 31 along the longitudinal direction of the groove 1 and an appropriate number of cross bars 32 orthogonal to the main bars 31. The side bars 33 are arranged along the crossbar 32 at both ends of each main bar 31, and a plurality of main bars 31 are arranged in parallel at a predetermined interval w (see FIG. 4). Here, the grating lid 13 of this embodiment is of a very fine type, and the interval w between adjacent main bars 31 is set to 6 mm.

  Further, as shown in FIGS. 1 to 4, the grating lid 13 is placed at a position corresponding to the mounting beam 26 at least in the vicinity of both ends in the longitudinal direction via the mounting beam 26. Locking devices 36 for fixing to each other are provided. This locking device 36 has a U-shaped connecting frame comprising a plate-like bottom plate portion 37a extending substantially horizontally and a pair of side plate portions 37b, 37b extending upward from both front and rear edges of the bottom plate portion 37a. A body 37 is provided (see FIGS. 12 and 13), and the upper ends of both side plate portions 37b and 37b are joined to the lower end of the main bar 31 of the grating lid 13 by welding. As described above, the connecting lid body 37 is provided on the grating lid 13 so as to protrude below the main bar 31 at least near both ends in the longitudinal direction. The connecting frame body 37 is provided so that its vertical height is slightly shorter than the height of the riding beam 26.

  The connecting frame body 37 is formed with a long hole 38 having a predetermined length along the longitudinal direction of the grating lid 13 in the bottom plate portion 37a. The long hole 38 is provided so as to be directly below the gap between the main bars 31 and 31 located near the center in the width direction of the grating lid 13. A connecting screw 45 is inserted into the long hole 38 from above, and a screw head portion 46 of the connecting screw 45 is supported by being supported by an upper hole edge of the long hole 38 and can be rotated from above. In addition, the movable range along the longitudinal direction of the long hole 38 is limited by the long hole 38. The connection screw 45 inserted through the long hole 38 in this way is arranged so that the screw head 46 faces the gap between the main bars 31 and 31.

  A connecting piece 39 is attached to such a connecting frame body 37 via a connecting screw 45 inserted through the long hole 38. The connecting piece 39 includes a screw hole 40 to be screwed with the screw shaft portion 47 of the connecting screw 45, and in a state where the screw shaft portion 47 is screwed into the screw hole 40, the connecting screw 45 connects the connecting frame body. 37 is suspended. Further, a U-nut 44 having a locking function at a lower end portion protruding downward from the connecting piece 39 in a state where the screw shaft portion 47 of the connecting screw 45 is screwed into the screw hole 40 of the connecting piece 39. The U-nut 44 prevents the connecting piece 39 from dropping from the screw shaft portion 47 of the connecting screw 45. Note that the means for preventing the connection piece 39 from falling off may be a means for fixing a normal nut to the screw shaft portion 47 by welding as another means of the U nut 44.

  The connecting piece 39 has an L-shaped cross section including a connecting plate portion 39a extending in a substantially horizontal direction and an upright plate portion 39b rising from the rear end of the connecting plate portion 39a (see FIGS. 12 and 13). The screw hole 40 is provided in the connecting plate portion 39a. Then, the connecting piece 39 is moved forward and backward along the longitudinal direction with respect to the connecting screw 45, so that the front end portion of the connecting plate portion 39a faces the lower surface of the riding beam 26 (FIGS. 3A and 13). The position is converted into the retracted position (FIG. 3B and FIG. 12) retracted from the advanced position, and is raised and lowered through the screwing action by the screwing operation on the connecting screw 45. Note that the upright plate portion 39b of the connecting piece 39 comes into contact with the side plate portion 37b of the connecting frame body 37 at the advanced position, thereby causing a rotation restricting action of the connecting piece 39.

Next, how the locking device 36 fixes and releases the grating lid 13 and the lid receiving frame 12 will be described.
As shown in FIG. 3B, in the released state where the connecting piece 39 is in the retracted position, the grating lid 13 is mounted on the mounting beam 26 of the lid receiving frame 12 or above the mounting beam 26. It is movable. In the construction work, the grating lid 13 is mounted on the mounting beam 26 of the lid receiving frame 12 in such a state that the connecting piece 39 is released. Then, the connecting piece 39 is moved from the retracted position to the advanced position by moving the connecting screw 45 in the direction in which the connecting screw 45 is brought close to the riding beam 26 (see FIG. 12). With this advanced position, as shown in FIG. 3A, the front end of the connecting plate 39a of the connecting piece 39 faces the lower surface of the riding beam 26, and the connecting screw 45 is tightened at the advanced position. When the screwing operation is performed in the direction, the connecting piece 39 is lifted through the screwing action, and the front end portion of the connecting plate portion 39a is brought into a pressure contact state with the lower surface of the mounting beam 26 (FIG. 13). reference). In this fixed state, the connecting frame body 37 moves to the mounting beam 26 via the connecting piece 39 because the front end portion of the connecting plate portion 39 a of the connecting piece 39 is pressed against the lower surface of the mounting beam 26. Held impossible. That is, by setting this fixed state, the grating lid 13 is held immovably on the lid receiving frame 12, whereby the grating lid 13 is fixed to the lid receiving frame 12.

  Further, in the above fixed state, by rotating the connecting screw 45 in the loosening direction, the connecting piece 39 is lowered, and the pressure contact between the front end portion of the connecting plate portion 39a and the lower surface of the riding beam 26 is released. . Then, when the connecting screw 45 is moved in a direction to move away from the mounting beam 26, the position of the connecting piece 39 is changed from the advanced position to the retracted position, and the released state is established.

  In this embodiment, the connecting frame body 37 of the locking device 36 and the connecting plate portion 39a of the connecting piece 39 correspond to a pair of connecting portions according to the present invention.

Next, the plus driver 51 concerning the principal part of this invention is demonstrated.
As shown in FIG. 6, the plus driver 51 of the present embodiment rotates the connecting screw 45 described above, and is fitted into a cross groove 48 provided in the screw head 46 of the connecting screw 45. A tip fitting portion 61 is provided. Here, as shown in FIG. 5, the connecting screw 45 is composed of a screw head portion 46 and a screw shaft portion 47, and has a general form in which a cross groove 48 is formed in the screw head portion 46. It is. The general connecting screw 45 has an outer diameter g of a screw head 46 according to the nominal diameter of the screw shaft portion 47. Normally, the screw head 46 is smaller than the screw shaft portion 47. The diameter is large. The connection screw 45 of the present embodiment is a so-called truss screw having a cross groove 48 in the screw head 46, and has a sufficient tightening force and holding force to fix the grating lid 13 of the present embodiment to the lid receiving frame 12. M8 (nominal diameter of screw: d = 8 mm) that can exert the force is used. The connecting screw 45 has an outer diameter g of a screw head 46 of about 18 mm, and the cross groove 48 of the screw head 46 has a width s between opposing groove ends of about 7.8 mm. For such a rotation operation of the M8 screw, a plus driver having a nominal number = 3 in the JIS standard (JIS B4633) is usually used.

  In the present embodiment, the long hole 38 of the connection frame 37 described above allows the screw shaft portion 47 of the connection screw 45 of M8 to be inserted, and the screw head portion 46 of the connection screw 45 cannot be inserted. It is formed by the hole width. The screw hole 40 of the connecting piece 39 is a female screw that is screwed into the screw shaft portion 47 of the M8.

  On the other hand, as shown in FIG. 6, the plus driver 51 includes a driver bit 52 including the above-described tip fitting portion 61 and a driver grip 53 that is rotated by an operator. In this embodiment, the base 62 of the driver bit 52 is attached to the driver grip 53 so as not to be detachable, and the driver bit 52 and the driver grip 53 are integrated. The driver bit 52 is coupled to the distal end fitting portion 61 at the distal end portion, the round bar-shaped rotational shaft portion 63 coupled to the rear end of the distal end fitting portion 61, and the rear end of the rotational shaft portion 63. And a base 62. The rotating shaft portion 63 is a main shaft portion 63a having a circular cross-section with a predetermined outer diameter and a thin-diameter portion 63b having a circular cross-section with a diameter smaller than that of the main shaft portion 63a. The central axis of the main shaft portion 63a coincides with the central axis of the small diameter portion 63b. The small-diameter portion 63b is provided with a predetermined length from the front end coupled to the tip fitting portion 61, and the main shaft portion 63a is coupled from the rear end. Here, the outer diameter of the main shaft portion 63a conforms to the shaft diameter described in the general standard of a Phillips screwdriver (JIS B4633), and is substantially the same as the outermost diameter r of the tip fitting portion 61. That is, the outer diameter h of the narrow diameter portion 63b is shorter than the outermost diameter r of the tip fitting portion 61 (see FIG. 9).

  As shown in FIGS. 7 to 9, the front end fitting portion 61 includes four blade portions 71 provided every 90 degrees in the circumferential direction and four groove portions 72 a provided between the adjacent blade portions 71. , 72b, and each blade portion 71 can be fitted into the cross groove 48 of the screw head 46 of the connecting screw 45 from above. Here, the four groove portions 72a and 72b are provided at positions where the pair of groove portions 72a and 72a face each other with respect to the center axis, and the other pair of groove portions 72b and 72b face each other with respect to the center axis. The facing direction p1 of one groove pair 72a, 72a and the facing direction p2 of the other groove pair 72b, 72b are orthogonal to each other. On the other hand, the four blade portions 71 are respectively provided radially from the central axis to the blade edge portion 71a that is inclined upward from the tip toward the outside, and is coupled backward from the blade edge portion 71a. And a housing part 71b. And the outermost diameter r of the front-end | tip fitting part 61 is decided by the housing | casing part 71b of each blade part 71, and this outermost diameter r is the outer diameter of the main shaft part 63a of the rotating shaft part 63 as mentioned above. It is almost the same.

  The front end fitting portion 61 of this embodiment has a width t1 in the facing direction p1 of one groove pair 72a, 72a (hereinafter referred to as a first groove facing width t1) in the facing direction p2 of the other groove pair 72b, 72b. It is removed only along the facing direction p1 so as to be shorter than the width t2 (hereinafter referred to as the second groove facing width t2). Thereby, the removal surface parts 75 and 75 formed by the said removal are provided in the both sides of the said opposing direction p1 of the front-end | tip fitting part 61, respectively. Here, the cut-out surface portion 75 is formed by removing the groove edge of the groove portion 72a in the facing direction p1 (see FIG. 7A). More specifically, the notched groove edge forming the missing surface portion 75 is a side edge located on the groove 72a side in the blade pair 71, 71 facing each other through the groove 72a in the facing direction p1. And the rear edge of the groove 72a coupled to both side edges. The notched side edges of the blade portion 71 are the entire side edge on the groove portion 72a side of the casing portion 71b of the blade portion 71 and the side edge rear portion on the groove portion 72a side of the blade edge portion 71a. .

  In the driver bit 52 of the present embodiment, the front end fitting portion 61 can properly screw the M8 connecting screw 45 described above, and the front end fitting portion 61 is connected to the main bars 31 and 31 adjacent to the grating lid 13. It can be inserted into the gap. The tip fitting portion 61 is suitable for the screwing operation of the connecting screw 45 of the M8, and uses the standard size (JIS B4633) with the nominal number = 3 as described above. Therefore, the distal end fitting portion 61 has an outermost diameter r of about 8 mm. The front end fitting portion 61 has a first groove facing width t1 in the facing direction p1 shorter than the gap between the adjacent main bars 31 and 31. Specifically, the first groove facing width t1 in the facing direction p1 is about 5.9 mm while the gap between the adjacent main bars 31 is about 6 mm. The second groove facing width t2 in the other facing direction p2 is slightly shorter than the outermost diameter r (= about 8 mm) and longer than the first groove facing width t1 (for example, about 7. 5 mm). This second groove facing width t2 is substantially the same as the width in the facing direction of the pair of grooves in a general size with a nominal number of No. 3.

  Here, each blade portion 71 has only a side edge on the side of the groove portion 72a in the facing direction p1 is omitted, and is a general portion of the blade portion that is only a limited portion. It can be fitted to the cross groove on the M8 screw head in the same way as the plus driver with the nominal number = 3. Therefore, according to the front end fitting portion 61 of the present embodiment, it is possible to appropriately screw the M8 screw.

  Further, the front end fitting portion 61 is fitted in the cross groove 48 of the connection screw 45 below the main bar 31 so as to be accommodated in the connection frame body 37 of the lock device 36 described above. The predetermined length dimension is set shorter than the distance between the bottom plate portion 37 a of the body 37 and the lower surface of the main bar 31. Thereby, the front end fitting portion 61 can be inserted into the inside of the connecting frame body 37 by being inserted between the main bars 31 from above the grating lid 13 and projecting downward.

  Further, in the rotating shaft portion 63 of this embodiment, the outer diameter of the main shaft portion 63 a is about 8 mm, which is substantially the same as the outermost diameter r of the tip fitting portion 61. And the thin diameter part 63b is set to the dimension whose outer diameter h is shorter than the space | interval w of the main bars 31 and 31 which adjoin. Specifically, it is about 5.9 mm which is substantially the same as the first groove facing width t1 of the tip fitting portion 61 described above. Further, the length of the small diameter portion 63b is set to be longer than the vertical width of the main bar 31.

  Such a driver bit 52 can be inserted from above into the gap between the adjacent main bars 31 and 31 so that the leading end fitting portion 61 is along the direction in which the facing direction p1 is orthogonal to the main bar 31 (see FIG. 10, 11). Then, the front end fitting portion 61 is positioned below the main bar 31 and the small diameter portion 63b of the rotating shaft portion 63 is positioned in the gap between the adjacent main bars 31, 31, thereby the front end fitting portion 61. Can be rotated. Therefore, by fitting the tip fitting portion 61 into the cross groove 48 of the connection screw 45 below the main bar 31, the connection screw 45 can be screwed and tightened and released.

  The driver bit 52 of the present embodiment can be formed by cutting a commercial product corresponding to a nominal diameter = No. 3 in the standard of a plus driver (JIS B4633), for example. That is, by cutting each blade portion of the tip fitting portion of a commercial product so as to be removed only along the facing direction of one pair of groove portions at the facing position, the missing surface portion 75 of this embodiment, 75 can be formed, and the tip fitting portion 61 can be formed. Furthermore, the thin diameter part 63b of the rotating shaft part 63 can be shape | molded by cutting the shaft part of a commercial item. On the other hand, in addition to cutting and forming such a commercial product, it is also possible to form the driver bit 52 of this embodiment by cutting a cylindrical metal bar made of stainless steel. .

Next, a usage mode of the plus driver 51 according to the above-described embodiment will be described.
For example, in the construction work in which the above-described water passage covering device 11 for a groove is disposed in the groove 1, the left and right support frames 15a and 15b are disposed on the side walls 4a and 4b of the groove 1, respectively. The grating lid 13 is disposed so as to cover the water passage portion 9 formed by 15a and 15b. In the operation of disposing the grating lid 13, the grating lid 13 is passed to the support frames 15a and 15b with the connecting piece 39 of the locking device 36 released as shown in FIGS. It is mounted on the mounting beam 26. At this time, the connecting frame 37 of the locking device 36 is disposed adjacent to the riding beam 26.

  With the grating lid 13 mounted in this way, the connecting piece 39 of the locking device 36 is brought into a fixed state in pressure contact with the mounting beam 26 by using a Phillips screwdriver 51, so that the grating lid 13 is covered with the lid receiving frame. 12 is fixed. That is, as shown in FIG. 10, the front end fitting portion 61 of the Phillips screwdriver 51 is arranged so that the facing direction p1 is along the direction perpendicular to the longitudinal direction of the main bar 31 (in other words, the facing direction p2 is the main bar). 31 along the longitudinal direction of 31), the gap between adjacent main bars 31, 31 is inserted from above the grating lid 13. 11 and 12, the front end fitting portion 61 protrudes below the main bar 31 and is fitted into the cross groove 48 of the connecting screw 45 of the locking device 36, and the rotating shaft portion 63 The small-diameter portion 63b is kept inserted between the adjacent main bars 31 and 31. In this state, by moving the plus driver 51 in the direction approaching the riding beam 26, the position of the connecting screw 45 and the connecting piece 39 is changed from the retracted position to the advanced position. In this advanced position, as shown in FIGS. 13 and 14, when the screwdriver 51 is screwed in the tightening direction of the connecting screw 45, the connecting piece 39 rises and the connecting plate of the connecting piece 39 is connected. The front end portion of the portion 39a is pressed against the lower surface of the riding beam 26. In this way, the grating lid 13 is fixed to the lid receiving frame 12. After the fixing, the tip fitting portion 61 is taken out from the gap of the main bar 31 so that the facing direction p1 is along the direction orthogonal to the longitudinal direction of the main bar 31 as in the insertion.

  Further, when performing the maintenance work such as maintenance and repair after the above-described construction, when the grating lid 13 is removed from the lid receiving frame 12, the tip fitting portion 61 of the plus driver 51 is used as the main as in the construction. By inserting into the gap of the bar 31 and rotating it, the pressure contact between the connecting piece 39 and the mounting beam 26 is released, and further, the connecting piece 39 is moved from the advanced position to the retracted position, so that the grating is operated. The lid 13 can be removed.

  Thus, according to the plus driver 51 (driver bit 52) of the present embodiment, the connecting screw 45 having a nominal size larger than the interval w between the main bars 31 of the grating lid 13 is used for fixing the grating lid 13. In addition, since the connecting screw 45 can be operated through the gap between the main bars 31, the fixing and releasing can be performed appropriately and stably. That is, even if the plus driver 51 has a size corresponding to a reference number larger than the gap of the main bar 31, the connecting screw 45 disposed below the main bar 31 can be screwed. Therefore, the connection screw 45 having a nominal diameter that is properly tightened and released by such a large nominal number screwdriver can be applied to the locking device 36 that fixes the grating lid 13. In other words, the connection screw 45 having a nominal diameter larger than the interval w between the main bars 31 can be used. Therefore, if the plus driver 51 of the present embodiment is used, a connecting screw 45 having a larger nominal diameter than the interval w of the main bar 31 can be applied. The grating lid 13 can be stably fixed to the lid receiving frame 12 with force.

  The fixing of the grating lid 13 and the lid receiving frame 12 when a general plus driver is used will be described. Here, as described above, the grating lid 13 has a gap w between the main bars 31 of about 6 mm. A typical Phillips screwdriver that can be inserted between the main bars 31 at this interval is one having a nominal number = 2. The connecting screw 45 that can be properly screwed by the second Phillips screwdriver has a nominal diameter of M3 to M5, and usually has the M5 with the highest tightening force. As described above, the nominal diameter size of the connecting screw 45 is determined based on the interval between the main bars 31. On the other hand, a screw having a stronger tightening force and holding force has been demanded. In response to this request, in order to use the M6 or M8 connecting screw 45, which has a stronger tightening force and holding force than M5, it is necessary to use a No. 3 Phillips screwdriver. The thing cannot be used because the interval w of the main bar 31 cannot be inserted. Here, suppose that the above-mentioned Phillips screwdriver with the nominal number = 2 is used for the screwing operation of the connecting screw 45 of M6 or M8. The fitting with the groove is loose, it is difficult to obtain a sufficient tightening force, and it is difficult to release the tightening. Then, if the screwing operation is forcibly performed by No. 2, the cross groove 48 of the connecting screw 45 may be crushed.

  In contrast to such a general Phillips screwdriver, according to the Phillips screwdriver 51 of the present embodiment, the M8 connecting screw 45 can be tightened and unfastened appropriately and stably as described above. In other words, conventionally, when a general plus driver is used, the nominal diameter size of the connecting screw 45 that can be screwed appropriately and stably is limited by the gap between the main bars 31 of the grating lid 13. When the plus driver 51 of the embodiment is used, the connecting screw 45 having a larger nominal diameter than that of the general plus driver can be screwed appropriately and stably. Therefore, the grating lid 13 and the lid receiving frame 12 can be fixed with a stronger tightening force and holding force than in the past.

  On the other hand, the plus driver 51 (driver bit 52) of the above-described embodiment has the dimension size of the first groove facing width t1 of the tip fitting part 61 and the outer diameter h and length dimension of the narrow diameter part 63b of the rotating shaft part 63. For the so-called grating lid that matches the dimensional size of the grating lid 13, but not limited to this, the shapes of the tip fitting portion 61 and the small-diameter portion 63 b can be used for other purposes. It is also possible to set dimensions. For example, by using the screwdriver bit (plus screwdriver) of the present invention for a configuration in which a connecting screw is arranged in the back of a gap such as a slit, a connecting screw having a larger nominal diameter than the gap can be appropriately and stably provided. Can be tightened and released. That is, the one having the dimension and shape of the first groove facing width t1 of the tip fitting portion 61 and the small diameter portion 63b of the rotating shaft portion 63 that can be adapted to the place where the symmetrical connecting screw is arranged is manufactured or selected. The connecting screw can be tightened with a stronger tightening force and holding force.

In this invention, it is not limited to the Example mentioned above, It can implement by changing suitably also about structures other than these Examples within the range of the meaning of this invention.
For example, in the embodiment described above, the plus driver 51 in which the driver bit 52 is integrated with the driver grip 53 is used. However, the present invention is not limited to this, and a configuration in which the driver bit can be detached from the driver grip may be used. In addition, the driver grip may be a grip that grips a driver bit in an electric power tool, as well as a grip that an operator grips and performs a screwing operation.
Further, in the above-described embodiment, the connecting screw having the nominal diameter of M8 is symmetric, but it is needless to say that nominal diameters of other sizes may be used, and similar effects can be obtained.
In the above-described embodiment, a general truss screw is applied to the connection screw. However, the present invention is not limited to this, and screws having other shapes can be used. Furthermore, a screw having a locking function may be used, or a connecting screw to which a locking function member is attached can be used.
In the above-described embodiment, the rotary shaft portion 63 has a round bar shape. However, the main shaft portion of the rotation shaft portion is not limited to a circular cross section, and has a polygonal cross section (for example, a hexagonal cross section). May be.

DESCRIPTION OF SYMBOLS 1 Groove 12 Cover cover frame 13 Grating cover 31 Main bar 37 Connection frame (connection part)
39a Connecting plate part (connecting part)
45 Connection screw 46 Screw head 48 Cross groove 52 Driver bit 53 Driver grip 61 Tip fitting part 62 Base part 63 Rotary shaft part 63b Small diameter part 71 Blade part 72a, 72b Groove part p1, p2 Opposing direction t1 First groove opposing width ( Width in the opposite direction)
t2 Second groove facing width (width in the facing direction)
w interval (main bar interval)

Claims (2)

It is formed in a substantially cross shape by four blade portions provided at intervals of 90 degrees in the circumferential direction and two pairs of groove portions provided between adjacent blade portions and facing each other. A tip fitting portion to be fitted to,
A base attached to the driver grip;
In the driver bit comprising a rod-shaped rotating shaft portion provided between the tip fitting portion and the base portion,
The tip fitting portion is
By removing each blade portion only along the facing direction of one groove portion pair, the width in the facing direction of the one groove portion pair is made shorter than the width in the facing direction of the other groove portion pair. Become
The rotating shaft portion is
A driver bit provided with a predetermined length from a front end coupled to the tip fitting portion and having a small diameter portion having an outer diameter equal to or less than a width in a facing direction of the one pair of groove portions. . Connecting and disconnecting a grating lid provided with a plurality of main bars arranged in parallel at a predetermined interval and a lid receiving frame disposed at the upper part of the channel via a pair of connecting portions arranged vertically below the main bar A connecting screw having a cross groove on a screw head for connecting the pair of connecting portions, and for screwing,
It is formed in a substantially cross shape by four blade portions provided at intervals of 90 degrees in the circumferential direction and two pairs of groove portions provided between adjacent blade portions and facing each other. A tip fitting portion to be fitted into the groove;
A base attached to the driver grip;
In a driver bit for a grating lid provided with a rod-shaped rotating shaft portion provided between the tip fitting portion and the base portion,
The tip fitting portion is
By removing each blade portion only along the facing direction of one groove portion pair, the width in the facing direction of the one groove portion pair is made shorter than the width in the facing direction of the other groove portion pair,
Furthermore, the width in the facing direction of the one groove pair is formed shorter than the interval between the adjacent main bars of the grating lid,
The rotating shaft portion is
Provided with a predetermined length from the front end coupled with the tip fitting portion, comprising a narrow-diameter portion having an outer diameter equal to or less than the width in the facing direction of the one groove portion pair,
The outer diameter of the narrow diameter portion is shorter than the interval between adjacent main bars of the grating lid, and the length of the narrow diameter portion is longer than the vertical width of the main bar. A driver bit for a grating lid characterized by

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