Connection bracket and frame material for mounting the same

Abstract

To provide a connection bracket excellent in mounting stability and a frame material supporting the same.SOLUTION: A connecting bracket 4 for connecting an auxiliary member 3 to a top plate 2 of a work scaffold 1 includes a holder part 31 for holding the auxiliary member 3, and a connecting part 32 for connecting the holder part 31 to a frame material 6 constituting a side edge part of the top plate 2. The connecting part 32 has an upper engaging part 34 engageable with the frame material 6 from above, a lower engaging part 35 engageable with the frame material 6 from below, and a support shaft part 36 extending in the vertical direction and configured to connect and support the upper engaging part 34 or the lower engaging part 35 so as to be vertically movable with respect to the holder part 31. One of the upper engaging part 34 and the lower engaging part 35 has a first end portion 42A pressed against a position eccentric in the left-right direction from an axis CL of the support shaft part 36 in the frame material 6 when engaged with the frame material 6, and the other of the upper engaging part 34 and the lower engaging part 35 has a protrusion 43 fitted into an engaged groove part 21 provided in the frame material 6 on the axis CL when engaged with the frame material 6.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a connecting bracket for connecting auxiliary members such as handrails to the top plate of a workbench, and a frame member to which the connecting bracket is attached.

Background Art

[0002] As an attachment device for a handrail temporarily installed at a construction work site or the like, there is known a device configured to connect and hold the lower end of the handrail support column to a clamp body and sandwich and fix the attachment target portion with the clamp body and a bolt (for example, Patent Document 1).

[0003] The handrail attachment device (clamp) disclosed in Patent Document 1 includes a clamp body and a push bolt. The clamp body has a base portion capable of detachably connecting and holding the lower end of the support column, a laterally extending portion extending laterally from the base portion, and a leg portion extending downward from the laterally extending portion. The push bolt extends in the same direction as the laterally extending portion with respect to the leg portion, and the attachment device is connected and held to the side plate portion of the staircase by tightening the tip end portion in a state where it faces the base portion of the clamp body.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, the top plate of a working scaffold temporarily installed and used at a separation part, a step part, a slope, etc. at a work site is widely used with frame members having a C-shaped cross section or a hollow cylindrical shape at the tread part and its side edge part in order to achieve weight reduction while maintaining high rigidity. However, this type of frame member has a thin outer wall. Therefore, when an auxiliary member such as a handrail is attached to the side edge of the top plate using the above mounting device, if a high torque is used to tighten the push bolt using an impact wrench or the like, depending on the contact position of the tip of the push bolt, deformation or breakage of the contact part may occur, and the mounting stability of the auxiliary member may be impaired.

[0006] The present invention has been made in view of the above problems, and an object thereof is to improve the mounting stability of an auxiliary member.

Means for Solving the Problems

[0007] In order to solve the above problems, the connecting bracket of the present invention and the frame member to which it is attached employ the following technical means.

[0008] A connecting bracket according to one aspect of the present invention is a connecting bracket for connecting an auxiliary member to the top plate of a working scaffold, and includes a holder portion for holding the auxiliary member and a connecting portion for connecting the holder portion to a frame member constituting the side edge of the top plate. With the longitudinal direction of the top plate as the front-rear direction, the width direction as the left-right direction, and the thickness direction as the up-down direction, the connecting portion has an upper engaging portion that can be engaged with the frame member from above, a lower engaging portion that can be engaged with the frame member from below, and extends in the up-down direction, and a support shaft portion that connects and supports the upper engaging portion or the lower engaging portion so as to be vertically movable with respect to the holder portion. One of the upper engaging portion and the lower engaging portion has a first end portion that presses against a position eccentric in the left-right direction from the axis of the support shaft portion in the frame member when engaged with the frame member, and the other of the upper engaging portion and the lower engaging portion has a protrusion portion that fits on the axis in an engaged groove portion provided in the frame member when engaged with the frame member.

[0009] The first end portion may be pressed against a position eccentric toward the center of the top plate from the axis in the frame member.

[0010] The protruding portion is formed in a tapered shape that narrows in width from the base end portion toward the tip end portion when viewed from the front-rear direction, and when inserted into the engaged groove portion, the left and right tapered surface portions may be respectively abutted against the left and right inner surface portions of the engaged groove portion with the axis therebetween interposed therebetween.

[0011] The upper engaging portion may be connected and supported to the support shaft portion, and the lower engaging portion may be fixed to the holder portion.

[0012] The other of the upper engaging portion and the lower engaging portion may have an engaging surface portion that faces and abuts against the engaged surface portion of the frame member when engaged with the frame member.

[0013] The upper engaging portion and the lower engaging portion may be formed in a plate shape that is longer in the front-rear direction than the front-rear width of the holder portion and can be engaged along the extending direction of the frame member.

[0014] The frame member according to one aspect of the present invention is a frame member that constitutes a side edge portion of a top plate of a work platform, and when the connecting bracket according to any one of claims 1 to 6 is connected, it has an engaged surface portion against which the first end portion is pressed, with the length direction of the top plate being the front-rear direction, the width direction being the left-right direction, and the thickness direction being the up-down direction, an overhanging portion that extends in the front-rear direction along the upper edge portion of the inner surface portion facing the left-right center side of the top plate and protrudes toward the left-right center side is provided on the inner surface portion, and the engaged surface portion is provided on the overhanging portion.

[0015] The frame member according to one aspect of the present invention is a frame member that constitutes a side edge portion of a top plate of a work platform, and when the connecting bracket according to any one of claims 1 to 6 is connected, it has an engaged surface portion against which the first end portion is pressed, and the engaged surface portion has a plurality of rib-shaped protrusions.

Advantages of the Invention

[0016] According to the connecting bracket of the present invention, when the upper engaging portion and the lower engaging portion are respectively engaged with the frame material at the side edge portion of the top plate, the pressing force does not concentrate on the axis of the support shaft portion in the frame material, so that deformation or breakage of the frame material hardly occurs. Thereby, the mounting stability of the auxiliary member is improved.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0018] Hereinafter, a connecting bracket according to an embodiment of the present invention and a frame material to which it is attached will be described with reference to the drawings. Note that the embodiments described below are examples that embody the present invention, and do not limit the configuration of the present invention with specific examples.

[0019] The work scaffold 1 of the present embodiment is temporarily installed and used at a separated portion, a stepped portion, a slope surface, etc. at the work site is a scaffold board. As shown in FIGS. 1 to 3, the work scaffold 1 of the present embodiment includes a top plate 2, a handrail 3 as an auxiliary member, and a connecting bracket 4. In the work scaffold 1 of the present embodiment, the handrail 3 is provided only at one side edge portion of the top plate 2. Note that the handrail 3 may be provided at both side edge portions of the top plate 2 as necessary.

[0020] The top plate 2 is a plate member that is long in one direction and has a tread plate 5 and side frames (frame members) 6. Further, the handrail 3 of the present embodiment is configured by combining cylindrical tubes vertically and horizontally and has a horizontal crossbar 7 and a support column 8.

[0021] In the present embodiment, the longitudinal direction of the top plate 2 (the direction indicated by the arrows X1 and X2 in FIG. 1) is defined as the front-rear direction, the short-side direction of the top plate 2 (the direction indicated by the arrows Y1 and Y2 in FIG. 1) is defined as the left-right direction, and the thickness direction of the top plate 2 (the direction indicated by the arrows Z1 and Z2 in FIG. 1) is defined as the up-down direction for explanation.

[0022] The top plate 2 of the present embodiment has two tread plates 5 and two side frames 6. The two tread plates 5 are arranged side by side in the left-right direction. The side frames 6 are respectively connected to the left edge of the left tread plate 5 and the right edge of the right tread plate 5. That is, the side frames 6 constitute the left and right side edges 2A and 2B of the top plate 2. Note that the top plate 2 may be configured by arranging three or more tread plates 5 side by side in the left-right direction, or may be configured by one tread plate 5.

[0023] As shown in FIGS. 2 and 3, a plurality of lower crossbars 9 are extended between the left and right side frames 6. The tread plate 5 is a flat plate frame member that is long in the front-rear direction and is supported above the lower crossbar 9.

[0024] As shown in FIGS. 2 to 4, the side frame 6 is a hollow member having a substantially rectangular cross section and extends in the front-rear direction along the left and right side edges of the tread plate 5. The side frame 6 has an upper plate portion 11 that constitutes the upper surface portion, a lower plate portion 12 that constitutes the lower surface portion, an inner plate portion (inner side surface portion) 13 that constitutes the side surface portion on the top plate 2 side, and an outer plate portion (outer side surface portion) 14 that constitutes the side surface portion on the side opposite to the top plate 2. The upper plate portion 11 connects the upper edges of the inner plate portion 13 and the outer plate portion 14 to each other. The lower plate portion 12 connects the lower edges of the inner plate portion 13 and the outer plate portion 14 to each other.

[0025] As shown in FIG. 4, the upper plate portion 11 has a protrusion portion 15 and an upper engaged surface portion 16. The protrusion portion 15 is provided at the center between the left and right sides of the upper plate portion 11. The protrusion portion 15 is formed in a trapezoidal cross-section. That is, the protrusion portion 15 is formed in a tapered shape that narrows from the base end portion toward the tip end portion when viewed from the front-rear direction. When connecting the connection bracket 4 to the side frame 6, the protrusion portion 15 is inserted into a groove portion 41 of an upper engaging portion 34 described later.

[0026] The upper engaged surface portion 16 is provided on both the left and right sides of the protrusion portion 15. The upper engaged surface portion 16 extends outward in the left and right directions from the base end portion of the protrusion portion 15. Among the left and right upper engaged surface portions 16, a first engaged surface portion 16A extending toward the top plate 2 side becomes an engaged surface portion against which a first engaging surface portion 42A of the upper engaging portion 34 described later is pressed.

[0027] A rib 18 is formed on the first engaged surface portion 16A. The rib 18 is a narrow protrusion that protrudes upward, extends in the front-rear direction along the first engaged surface portion 16A, and a plurality of ribs are provided side by side in the left-right direction.

[0028] The lower plate portion 12 has an engaged groove portion 21 and a lower engaged surface portion (engaged surface portion) 22. The engaged groove portion 21 is provided at the center between the left and right sides of the lower plate portion 12. The engaged groove portion 21 is formed in a trapezoidal cross-section. That is, the engaged groove portion 21 is formed in a tapered shape that narrows from the opening end portion toward the upper bottom portion 23 when viewed from the front-rear direction. The upper bottom portion 23 of the engaged groove portion 21 becomes an engaged surface portion against which the upper end surface portion 46 of a protrusion portion 43 of a lower engaging portion 35 described later is pressed. Also the left and right inner side surface portions 24 of the engaged groove portion 21 become engaged surface portions against which the tapered surface portions 45 of the protrusion portion 43 of the lower engaging portion 35 described later are pressed.

[0029] The lower engaged surface portion 22 is provided on both the left and right sides of the engaged groove portion 21. The lower engaged surface portion 22 extends outward to the left and right from the opening end portion of the engaged groove portion 21. Each of the left and right lower engaged surface portions 22 serves as an engaged surface portion against which the engaged surface portion 44 of the lower engaging portion 35 described later is pressed. Ribs 25 are respectively formed on the lower engaged surface portions 22. The rib 25 is a narrow protrusion convex downward, extends in the front-rear direction along the lower engaged surface portion 22, and a plurality of ribs are provided side by side in the left-right direction.

[0030] The inner plate portion 13 has an overhanging portion 26 and a support frame portion 27. The overhanging portion 26 is a hollow body with a substantially rectangular cross-section, and is formed to overhang from the upper edge portion of the inner plate portion 13 toward the top plate 2 side (the left and right center side of the top plate 2). The overhanging portion 26 extends in the front-rear direction along the upper edge portion of the inner plate portion 13. The overhanging portion 26 of the present embodiment is set to the same vertical height (thickness) as the tread plate 5. The lower crossbar 9 extends in the left-right direction along the lower surface portion of the overhanging portion 26.

[0031] The upper surface portion of the overhanging portion 26 is constituted by the first engaged surface portion 16A of the upper plate portion 11 of the side frame 6. That is, the first engaging surface portion 42A of the upper engaging portion 34 described later is pressed against the upper surface portion of the overhanging portion 26.

[0032] The support frame portion 27 is a flat plate-like protruding piece, and is formed to protrude from the inner plate portion 13 toward the top plate 2 side (the left and right center side of the top plate 2). The support frame portion 27 is arranged at a predetermined interval below the overhanging portion 26, and supports the left and right ends of the lower crossbar 9 from below. That is, the lower crossbar 9 is inserted and supported in the gap between the support frame portion 27 and the overhanging portion 26.

[0033] The connecting bracket 4 is a member for connecting the handrail (auxiliary member) 3 to the top plate 2. As shown in FIGS. 2, 5 to 7, the connecting bracket 4 has a holder portion 31, a connecting portion 32, and a fixing pin 33. In the present embodiment, the front-rear direction, the left-right direction, and the up-down direction are shown based on the direction of the connecting bracket 4 when it is connected to the side frame 6 on the rear side of the top plate 2.

[0034] The holder portion 31 is a substantially rectangular cylindrical body that is open at the top and bottom, and inserts and holds the support column 8 of the handrail (auxiliary member) 3. As shown in FIG. 5, a bottom wall 31L is provided on the inner bottom portion of the holder portion 31. The support column 8 of the handrail 3 is inserted into the holder portion 31 from the upper opening 31H and supported by the bottom wall 31L.

[0035] As shown in FIGS. 2, 5 to 7, the fixing pin 33 is a so-called eyebolt and is screwed and connected to the peripheral wall 31F of the holder portion 31 from the front. Thereby, the support column 8 is pressed by the fixing pin 33 and is fixedly held in a state of being prevented from coming off with respect to the holder portion 31.

[0036] The connecting portion 32 has an upper engaging portion 34, a lower engaging portion 35, and a support shaft portion 36. The connecting portion 32 connects and holds the holder portion 31 to the side frame 6 by engaging the upper engaging portion 34 with the side frame 6 from above and engaging the lower engaging portion 35 with the side frame 6 from below.

[0037] The upper engaging portion 34 and the lower engaging portion 35 are arranged to face each other in the vertical direction on the left side portion of the holder portion 31. The support shaft portion 36 is a bolt member that extends in the vertical direction and connects and supports the upper engaging portion 34 so as to be vertically movable with respect to the holder portion 31.

[0038] As shown in FIGS. 5 to 7, a shaft connection portion 37 is provided on the upper wall 31T of the holder portion 31. The shaft connection portion 37 is a nut member, and the support shaft portion 36 is screwed and connected thereto. In this way, the support shaft portion 36 is connected and supported so as to be vertically movable with respect to the upper wall 31T of the holder portion 31 is.

[0039] The upper engaging portion 34 is connected to a connecting fitting 38. A rail portion 39 is provided on the left side portion of the holder portion 31, and the connecting fitting 38 is engaged and held so as to be vertically slidable with respect to the rail portion 39. As shown in FIGS. 5 and 6, the lower end portion of the support shaft portion 36 is inserted into the connecting fitting 38 from above and is connected and held in a state of being prevented from coming off by a retaining pin 36P.

[0040] Thus, by tightening or loosening the support shaft portion 36, the upper engaging portion 34 moves within a predetermined range in the extending direction (vertical direction) of the axis CL along the rail portion 39. In this way, the support shaft portion 36 connects and holds the upper engaging portion 34 to be vertically movable at the holder portion 31.

[0041] The upper engaging portion 34 is a plate member that is long in the front-rear direction and has a groove portion 41 and an engaging surface portion 42. The groove portion 41 is formed at the center between the left and right sides of the upper engaging portion 34, extending from the front end to the rear end.

[0042] The engaging surface portions 42 are provided on both the left and right sides of the groove portion 41. The engaging surface portions 42 extend outward in the left and right directions from the opening edge of the groove portion 41. Among the left and right engaging surface portions 42 of the upper engaging portion 34, the first engaging surface portion (first end portion) 42A extending toward the top plate 2 side is pressed against the first engaged surface portion 16A on the upper plate portion 11 of the side frame 6 when the connecting bracket 4 is connected to the side frame 6. That is, as shown in FIG. 3, when the first engaging surface portion 42A of the upper engaging portion 34 is engaged with the side frame 6, it is pressed against a position eccentric in the left-right direction from the axis CL of the support shaft portion 36 in the side frame 6.

[0043] As shown in FIG. 6, the front-rear width D1 of the upper engaging portion 34 is set to be larger than the front-rear width D2 of the holder portion 31. That is, the upper engaging portion 34 is formed to be longer in the front-rear direction than the front-rear width D2 of the holder portion 31 and is configured to be engageable along the extending direction of the frame member 6. Therefore, when the connecting bracket 4 is connected to the side frame 6 as described above, the upper engaging portion 34 makes surface contact with a range wider than the front-rear width D2 of the holder portion 31 along the upper plate portion 11 of the side frame 6.

[0044] As shown in FIGS. 5 to 7, the lower engaging portion 35 is fixed at a position below and opposite to the upper engaging portion 34 in the holder portion 31. That is, in the connecting bracket 4 of the present embodiment, the upper engaging portion 34 is connected and supported by the support shaft portion 36 to be vertically movable with respect to the holder portion 31, and the lower engaging portion 35 is fixed to the holder portion 31.

[0045] The lower engaging portion 35 is a plate member that is long in the front-rear direction and has a protruding portion 43 and an engaging surface portion 44. The protruding portion 43 is formed from the front end to the rear end at the center between the left and right sides of the lower engaging portion 35 (on the axis CL). The protruding portion 43 is formed in a trapezoidal cross-section. That is, the protruding portion 43 is formed in a tapered shape that narrows in width from the base end portion toward the tip end portion when viewed from the front-rear direction.

[0046] The protruding portion 43 has tapered surface portions 45 on the left and right sides with the axis CL in between. These tapered surface portions 45 are set to have the same inclination as the left and right inner surface portions 24 of the engaged groove portion 21. The vertical height from the base end portion to the upper end surface portion 46 of the protruding portion 43 is set to be the same as the vertical height from the opening end portion to the upper bottom portion 23 of the engaged groove portion 21.

[0047] Therefore, when the lower engaging portion 35 is engaged with the lower plate portion 12 of the side frame 6 from below, the protruding portion 43 fits in a state of being flush with the engaged groove portion 21 of the lower plate portion 12 on the axis CL. More specifically, when the protruding portion 43 is inserted into the engaged groove portion 21 as described above, the left and right tapered surface portions 45 respectively abut against the left and right inner surface portions 24 of the engaged groove portion 21 in a state of being flush with each other with the axis CL in between. Also, the upper end surface portion 46 of the protruding portion 43 abuts against the upper bottom portion 23 of the engaged groove portion 21 in a state of being flush with each other.

[0048] As shown in FIG. 6, the front-rear width D3 of the lower engaging portion 35 is set to be larger than the front-rear width D2 of the holder portion 31. That is, the lower engaging portion 35 is formed to be longer in the front-rear direction than the front-rear width D2 of the holder portion 31 and is configured to be engageable along the extending direction of the frame member 6. Therefore, when the connecting bracket 4 is connected to the side frame 6 as described above, the lower engaging portion 35 makes surface contact with a wider range than the front-rear width D2 of the holder portion 31 along the lower plate portion 12 of the side frame 6. In this embodiment, the front-rear width D3 of the lower engaging portion 35 is set to be the same as the front-rear width D1 of the upper engaging portion 34, but it may be set to be larger than the front-rear width D1 of the upper engaging portion 34.

[0049] In the above-described embodiment, the upper engaging portion 34 is connected and supported so as to be vertically movable with respect to the holder portion 31. However, the lower engaging portion 35 may be connected and supported so as to be vertically movable with respect to the holder portion 31. Specifically, as shown in FIG. 8, the support shaft portion 36 is connected and supported so as to be vertically movable with respect to the bottom wall 31L of the holder portion 31. The lower engaging portion 35 is connected and held to the upper end portion of the support shaft portion 36. On the other hand, the upper engaging portion 34 is fixed at a position above and opposite to the upper engaging portion 34 in the holder portion 31. Therefore, by tightening or loosening the support shaft portion 36, the lower engaging portion 35 moves vertically so as to approach and separate from the upper engaging portion 34. Thereby, the same operational effects as those of the above-described embodiment are achieved.

[0050] In the above-described embodiment, the first engaging surface portion (first end portion) 42A of the upper engaging portion 34 is pressed against a position eccentric in the left-right direction with respect to the axis CL in the side frame 6, and the protruding portion 43 of the lower engaging portion 35 is configured to be fitted onto the engaged groove portion 21 of the side frame 6 on the axis CL. However, the first end portion provided on the lower engaging portion 35 may be pressed against a position eccentric in the left-right direction with respect to the axis CL in the side frame 6, and the protruding portion provided on the upper engaging portion 34 may be configured to be fitted onto the groove portion provided on the upper plate portion 11 of the side frame 6 on the axis CL. Even in this case, the same operational effects as those of the above-described embodiment are achieved.

[0051] As described above, the present invention provides a connecting bracket described in the following items, and a frame member to which the same is attached.

[0052] (Item 1) A connecting bracket 4 for connecting an auxiliary member 3 to the top plate 2 of the work scaffold 1, a holder portion 31 for holding the auxiliary member 3, and a connecting portion 32 for connecting the holder portion 31 to a frame member 6 constituting a side edge portion of the top plate 2, with the longitudinal direction of the top plate 2 being the front-rear direction, the width direction being the left-right direction, and the thickness direction being the up-down direction, the connecting portion 32 has an upper engaging portion 34 that can be engaged with the frame member 6 from above, and a lower engaging portion 35 that can be engaged with the frame member 6 from below, It has a support shaft portion 36 that extends in the vertical direction and connects and supports the upper engaging portion 34 or the lower engaging portion 35 so as to be vertically movable with respect to the holder portion 31. One of the upper engaging portion 34 and the lower engaging portion 35 has a first end portion 42A that, when engaged with the frame member 6, presses against a position eccentric in the left - right direction from the axis CL of the support shaft portion 36 in the frame member 6. The other of the upper engaging portion 34 and the lower engaging portion 35 has a protrusion portion 43 that, when engaged with the frame member 6, fits onto the axis CL in an engaged groove portion 21 provided in the frame member 6.

[0053] According to this connection bracket 4, when the upper engaging portion 34 and the lower engaging portion 35 are respectively engaged with the frame member 6 at the side edge portion of the top plate 2, the pressing force does not concentrate on the axis CL of the support shaft portion 36 in the frame member 6. Therefore, deformation or breakage of the frame member 6 is less likely to occur. As a result, it becomes possible to stably attach the auxiliary member 3 to the frame member 6. Moreover, in this case, since the frame member 6 can be engaged and held by the first end portion 42A of the upper engaging portion 3 4 and the protrusion portion 43 of the lower engaging portion 35, the auxiliary member 3 can be attached to the frame member 6 more stably.

[0054] (Item 2) The first end portion 42A is pressed against a position eccentric toward the center side of the top plate 2 from the axis CL in the frame member 6.

[0055] According to this connection bracket 4, even if an external force is applied to the auxiliary member 3 from the outside of the top plate 2, the holder portion 31 is difficult to tilt toward the center side of the top plate 2, so the mounting stability is further improved.

[0056] (Item 3) The protrusion portion 43 is formed in a tapered shape that narrows from the base end portion toward the tip end portion when viewed from the front - rear direction. When inserted into the engaged groove portion 21, the left - and - right tapered surface portions 45 respectively contact the left - and - right inner side surface portions 24 of the engaged groove portion 21 with the axis therebetween.

[0057] According to this connecting bracket 4, when the upper engaging portion 34 and the lower engaging portion 35 are respectively engaged with the frame member 6 at the side edge portion of the top plate 2, the pressing force is less likely to be concentrated on the axis CL in the frame member 6, so that the frame member 6 is less likely to be deformed or damaged. Moreover, with this structure, the frame member 6 can be more firmly engaged and held by the first end portion 42A of the upper engaging portion 34 and the tapered surface portion 45 of the protruding portion 43 of the lower engaging portion 35. Therefore, the mounting stability is further improved.

[0058] (Item 4) The upper engaging portion 34 is connected and supported by the support shaft portion 36, The lower engaging portion 35 is fixed to the holder portion 31.

[0059] According to this connecting bracket 4, since the frame member 6 can be engaged and held from above and below by the lower engaging portion 35 fixed to the holder portion 31 and the upper engaging portion 34 connected to the holder portion 31 so as to be vertically movable, compared with a structure configured to engage the frame member 6 from the left and right directions, the frame member 6 can be connected and held with less rattling. Therefore, the mounting stability is further improved.

[0060] (Item 5) The other of the upper engaging portion 34 and the lower engaging portion 35 has an engaging surface portion 44 that faces and abuts against the engaged surface portion 22 of the frame member 6 when engaged with the frame member 6.

[0061] According to this connecting bracket 4, when engaged with the frame member 6, since the engaging surface portion 44 of the upper engaging portion 34 or the lower engaging portion 35 and the engaged surface portion 22 of the frame member 6 are engaged in a face-to-face state, compared with a structure configured such that the upper engaging portion 34 or the lower engaging portion 35 and the frame member 6 are engaged at points or lines, the frame member 6 can be connected and held with less rattling. Therefore, the mounting stability is further improved.

[0062] (Item 6) The upper engaging portion 34 and the lower engaging portion 35 are formed in a plate shape that is longer in the front-rear direction than the front-rear width D2 of the holder portion 31 and can be engaged along the extending direction of the frame member 6.

[0063] According to this connecting bracket 4, since the swinging of the holder portion 31 in the front-rear direction is more effectively suppressed by the upper engaging portion 34 and the lower engaging portion 35, the mounting stability is further improved.

[0064] (Item 7) In addition, the frame member 6 according to the embodiment of the present invention is a frame member 6 that constitutes a side edge portion of the top plate 2 of the work platform 1, when the connecting bracket 4 described in any one of the above items 1 to 6 is connected, it has an engaged surface portion 16A against which the first end portion 42A is pressed, assuming that the longitudinal direction of the top plate 2 is the front-rear direction, the width direction is the left-right direction, and the thickness direction is the up-down direction, an overhanging portion 26 that extends in the front-rear direction along the upper edge portion of the inner surface portion 13 and protrudes toward the left-right center side is provided on the inner surface portion 13 facing the left-right center side of the top plate 2, the engaged surface portion 16A is provided on the overhanging portion 26.

[0065] According to this frame member 6, since deformation and breakage of the engaged surface portion 16A against which the first end portion 42A of the connecting bracket 4 is pressed are unlikely to occur, the connecting bracket 4 can be firmly fixed and held against the frame member 6 with little rattling.

[0066] (Item 8) In addition, the frame member 6 according to the embodiment of the present invention is a frame member 6 that constitutes a side edge portion of the top plate 2 of the work platform 1, when the connecting bracket 4 described in any one of the above items 1 to 6 is connected, it has an engaged surface portion 16A against which the first end portion 42A is pressed, the engaged surface portion 16A has a plurality of rib-shaped protrusions 18.

[0067] According to this frame member 6, deformation and breakage of the engaged surface portion 16A against which the first end portion 42A of the connecting bracket 4 is pressed are unlikely to occur, and the displacement of the first end portion 42A from the engaged surface portion 16A can also be suppressed. Therefore, the connecting bracket 4 can be firmly fixed and held against the frame member 6 with little rattling.

[0068] As described above, the present invention has been explained. However, it should be considered that all the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Explanation of Signs

[0069] 1 Workbench 2 Top plate 3 Handrail (auxiliary member) 4 Connecting bracket 6 Side frame (frame material) 8 Support column 11 Upper plate part 12 Lower plate part 15 Engaged protrusion 16 Upper engaged surface 16A First engaged surface 18 Rib (rib-shaped protrusion) 21 Engaged groove part 22 Lower engaged surface 24 Inner surface 34 Upper engaging part 35 Lower engaging part 41 Engaging groove part 42 Upper engaging surface 42A First engaging surface 43 Engaging protrusion 44 Lower engaging surface 45 Tapered surface

Claims

1. A connecting bracket for connecting an auxiliary member to the top plate of a work platform, comprising: a holder portion for holding the auxiliary member; a connecting portion for connecting the holder portion to a frame member constituting a side edge portion of the top plate, with the longitudinal direction of the top plate being the front-rear direction, the width direction being the left-right direction, and the thickness direction being the up-down direction, wherein the connecting portion has an upper engaging portion that can be engaged with the frame member from above, a lower engaging portion that can be engaged with the frame member from below, and a support shaft portion that extends in the up-down direction and connects and supports the upper engaging portion or the lower engaging portion to the holder portion so as to be vertically movable, wherein one of the upper engaging portion and the lower engaging portion has a first end portion that, when engaged with the frame member, presses against a position eccentric in the left-right direction from the axis of the support shaft portion in the frame member, and the other of the upper engaging portion and the lower engaging portion has a protruding portion that fits on the axis into an engaged groove portion provided in the frame member when engaged with the frame member. A connecting bracket.

2. The connecting bracket according to claim 1, wherein the first end portion is pressed against a position eccentric toward the center side of the top plate from the axis in the frame member.

3. The protruding portion is formed in a tapered shape that narrows in width from the base end portion toward the tip end portion when viewed from the front-rear direction, and when inserted into the engaged groove portion, the left and right tapered surface portions are respectively in contact with the left and right inner surface portions of the engaged groove portion across the axis. The connecting bracket according to claim 1.

4. The upper engaging portion is connected and supported to the support shaft portion, and the lower engaging portion is fixed to the holder portion. The connecting bracket according to claim 1.

5. The other of the upper engaging portion and the lower engaging portion has an engaging surface portion that faces and abuts against the engaged surface portion of the frame member when engaged with the frame member. The connecting bracket according to claim 1.

6. The upper engaging portion and the lower engaging portion are formed in a plate shape that is longer in the front-rear direction than the front-rear width of the holder portion and can be engaged along the extending direction of the frame member. The connecting bracket according to claim 1.

7. A frame member constituting a side edge portion of the top plate of a work platform, having an engaged surface portion against which the first end portion is pressed when the connecting bracket according to any one of claims 1 to 6 is connected, with the longitudinal direction of the top plate being the front-rear direction, the width direction being the left-right direction, and the thickness direction being the up-down direction, an overhanging portion that extends in the front-rear direction along the upper edge portion of the inner surface portion facing the left-right center side of the top plate and protrudes toward the left-right center side is provided on the inner surface portion. The engaged surface portion is a frame member provided on the protruding portion.

8. A frame member constituting a side edge portion of the top plate of the work platform, when the connecting bracket according to any one of claims 1 to 6 is connected, having an engaged surface portion against which the first end portion is pressed, The engaged surface portion is a frame member having a plurality of rib-shaped protrusions.

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