JP4220559B2 - Tightening device for wedge-type tight scaffolding - Google Patents

Description

  The present invention relates to a binding device in a wedge-type binding scaffold.

  In this specification, in the relationship between the support column and the arm wood, the front side refers to the side with the support column to be tightened, and the rear side refers to the side with the arm wood to be tightened.

  The above-mentioned conventional fastening device is composed of a receiving bracket fixed to the outer periphery of a predetermined height of a support column and a wedge-shaped locking bracket fixed to an end of an arm lumber passed between the two support columns. The struts and arm lumbers were tightly bound by hitting the retaining brackets with a hammer from above and locking them. In addition, when releasing the tightness between the support column and the arm lumber, either release the lock by hitting the wedge lock bracket of the arm lumber from below with the hammer of the support column or near the support bracket of the prop. The end of the arm wood was struck from below with a hammer to release the lock of the wedge-shaped lock fitting fixed to the end. In this way, the support column and arm timber are simply tightened by receiving the wedge-shaped locking bracket and inserting it firmly into the bracket. During installation, if an unexpected force is applied to the arm wood from below, such as when a tool or material hits the arm wood, the wedge-shaped locking bracket will loosen, and the wedge-shaped locking will start from the receiving bracket. There was a risk that the bracket would come off. Furthermore, when a sheet steel floor cloth used in a frame scaffold that has been widely used in the past is attached to the arm wood, the floor cloth has a lock function for the arm wood. Therefore, when wind pressure is applied from below, there is a risk that the wedge-shaped metal fittings of the arm wood will come off the receiving metal and the cloth with the floor will fall together with the arm wood. Therefore, an expanded metal fabric that blows through the wind is used as a cloth with a floor. Since the expanded metal is narrower than the thin steel plate, if it is made of cloth with a floor having the same width as that of the thin steel plate, it becomes heavy and expensive. Therefore, although the width of the cloth with the floor is narrowed, if the width is narrow, anxiety is given to those who work on it. In addition, since the bottom made of expanded metal can be seen through, there is a problem that the work floor and the passage give further anxiety.

In the connecting device between the support and the horizontal member constituting the temporary structure, the following device has been proposed in which the locking as disclosed in Patent Document 1 is not unexpectedly released. That is, in this proposed apparatus, the receiving bracket is U-shaped when viewed from the plane and has an upper opening vertical groove in the center of the width of the central wall, and the locking bracket extends forward from the end plate of the horizontal member, and the receiving bracket. A horizontal projection having a rectangular cross section that fits in a vertical groove in the central wall of the central wall, a locking claw that is provided at the tip of the horizontal projection and is inserted between the central wall of the receiving bracket and the support column, In the rear, it is hooked slidably back and forth on the horizontal protrusion by a downward opening vertical groove formed in the center and has a forward horizontal convex part at the lower end, in the form of a vertical rectangle seen from the front, reversed from the side, A spring-made central wall clamping member that clamps the central wall with the front locking claw, and a hook that is vertically movable between the clamping member and the end plate so that it can be moved up and down. When viewed from the top, the upper half is wide and the lower half is narrow. Only those that and a wedge member which locking pin is passed.
JP 2003-56176 A JP 2006-45822 A

  According to the proposed device disclosed in Patent Document 1, after inserting the locking claw of the locking metal fitting between the central wall of the metal fitting and the column, the upper end of the wedge member at the raised position is hit with a hammer several times. The upper half-width portion is lowered and the spring-shaped central wall clamping member made of springs is advanced against the spring force, the central wall is clamped by the locking claw, and the column and the horizontal member are connected. Therefore, the spring force of the central wall clamping member is working at the time of connection, and the wedge member does not easily fall upward. However, since the spring center wall clamping member has an inverted shape, V-shaped and inverted V-shaped gaps are formed above and below the upper half wide portion of the wedge member. Accordingly, the horizontal member is slight but unstable with respect to the column.

  It is an object of the present invention to provide a binding device in a wedge-type scaffold that solves both the unexpected release of arm wood from the support and the instability of the arm wood with respect to the support.

  The binding device for the wedge-binding scaffold according to the invention of claim 1 is embedded so that the front side is exposed at the end of the arm lumber passed between the support metal and the two support columns fixed to the outer periphery of the predetermined height of the support column. It consists of a locking bracket that is installed and locked to the receiving bracket, and the receiving bracket is U-shaped with the center wall inclined forward and downward when viewed from the plane. A wedge guide member that has a central wall that protrudes downward from the arm lumber in a reverse U shape when viewed from the plane and that contacts the support column when inserted into the receiving bracket, and that has a wedge that is inserted in a vertically movable manner, and a wedge guide at the upper end. It is fixed to the upper part of one side wall of the member, is provided along the inner surface of the one side wall, and has a retaining pin at the lower end, and presses and holds the wedge slidably on the other side wall of the wedge guide member. Stop pin on one side of wedge guide member And a leaf spring that is biased in the opposite direction. The wedge has a vertical portion that contacts the central wall of the wedge guide member at the front edge when the wedge is lowered for tightening, and extends along the central wall of the receiving metal fitting. A front face inclined portion is provided in the middle of the length of the trailing edge, and a wedge surface facing the inner surface of one side wall of the wedge guide member is adjacent to the inner surface of the one side wall of the wedge guide member, and a wedge below the wedge surface. The guide member has a separation surface portion that is separated from the inner surface of one side wall, and a downward stepped portion is formed on the rear side of the wedge guide member that is received by the upper edge of the rear portion of the receiving bracket to ensure the level of the arm lumber. The lower part from the downward step of the wedge guide member is an insertion part to the receiving metal part. A pin housing part is formed on the insertion part of one side wall of the wedge guide member, and the wedge guide is guided to the upper edge of the rear part of the receiving metal part. The downward step of the member In the locked state, a pin receiving part is formed on one side wall of the receiving metal corresponding to the pin housing part, and the pin receiving part prevents the locking metal from coming off the receiving metal upward. The pin has an upper edge on which the pin is caught, and the proximity surface portion of the wedge is close enough to push the retaining pin against the spring force against the pin receiving portion of the bracket, and the separation surface portion of the wedge has the retaining pin. It is separated to such an extent that it can be pulled out from the pin receiving part of the receiving metal fitting by the spring force.

  The invention of claim 2 is the binding device in the wedge binding type scaffold according to claim 1, wherein the upper edge of the wedge guide member substantially coincides with the upper end of the arm lumber, and the wedge inserted into the wedge guide member is: At the time of binding, at least a portion of the entire upper edge of the cloth scaffolding with the sheet steel floor for the frame scaffolding is formed in a shape that is substantially the same height as the upper edge of the wedge guide member.

  According to a third aspect of the present invention, in the binding device for the wedge-tightening type scaffolding according to the first or second aspect, a plate having a length at which the wedge can move up and down at least on the surface of the wedge facing the inner surface of one side wall of the wedge guide member. A spring insertion groove is formed, and the leaf spring insertion groove has an upper shallow bottom portion serving as a proximity surface portion of the wedge and a lower deep bottom portion serving as a separation surface portion of the wedge, and both bottom portions are connected by an intermediate inclined bottom portion. Is.

  According to a fourth aspect of the present invention, in the binding device for a wedge-tightening type scaffold according to the first, second, or third aspect, the upper end of the leaf spring is latched to the outer edge of the recess formed at the upper end of one side wall of the wedge guide member. A flange, a vertical part to which a retaining pin is attached, a large first arc-shaped curved part that occupies most of the lower part of the collar and is convex on the wedge side, and a first arc-shaped curved part and a vertical part An upper end flange between which a leaf spring comprising a small second arcuate curved portion convex on the one side wall side of the wedge guide member is hooked on the outer edge of the recess formed on the upper end of the one side wall of the wedge guide member , A vertical part to which a retaining pin is attached, a large first arcuate curved part that occupies most of the lower part of the collar part and is convex on the wedge side, and between the first arcuate curved part and the vertical part And is formed of a small second arcuate curved portion convex on one side wall side of the wedge guide member. Than is.

  According to a fifth aspect of the present invention, in the binding device for a wedge-tightening type scaffold according to any one of the first to fourth aspects, the wedge is at the upper end portion of the wedge, and the wedge is about to fall downward from the wedge guide member. A wedge-preventing protrusion that is caught on the upper edge of the central wall of the guide member is provided, and at the lower end of the wedge, when the wedge is about to come out from the wedge guide member, both side walls of the wedge guide member Wedge that catches on the lower edge of the wedge When the wedge is about to fall down from the wedge guide member at the upper end of the wedge where the left and right protrusions are provided, the wedge is hooked on the upper edge of the central wall of the wedge guide member Protrusions before retaining are provided, and at the lower end of the wedge, when the wedge tries to come out upward from the wedge guide member, both sides of the wedge guide member In which the right and left projecting portions wedge upper stopper caught by the lower edge of the is provided.

  The invention according to claim 6 is the binding device for the wedge binding type scaffold according to any one of claims 1 to 5, wherein the arm lumber is made of a metal pipe, and the metal pipe is viewed from the upper and lower opposing wall ends in plan view. U-shaped cutouts are provided, and the vertical plate upper and lower ends having recesses on both side edges are fixed to the bottom of both cutouts, and perpendicular to the rear end of the upper part of the wedge guide member on the lower side of the side walls. Back protrusions that fit tightly into the recesses on both side edges of the plate are provided, and both rear protrusions of the wedge guide member are fitted into both recesses of the vertical plate and welded to the inner edge of the recess, opposing both sides of the notch The metal tube end separation portion is a side cover portion of the wedge guide member.

  According to the first aspect of the present invention, on the rear side of the wedge guide member, a downward stepped portion is formed which is received by the rear upper edge of the receiving bracket and ensures the level of the arm lumber. Since the arm lumber does not wobble, it can be held firmly and level, and even if the wedge is subjected to any force superior to the spring force from the bottom to the top, the retaining pin on the side of the locking bracket is the edge of the pin receiving hole of the receiving bracket. There is no risk that the wedge will come out. Accordingly, there is also an advantage that a cloth with a floor made of a thin steel plate can be used instead of the expanded metal.

  In the conventional wedge-binding scaffold, a cloth cloth with a floor having a width that does not hit the wedge-shaped fittings at both ends of the arm lumber is used. In the case of a framed scaffold, the cloth bracket with a floor grips the horizontal frame of the building frame, so there is no obstacle at the end of the horizontal frame, and the floor is wider than the cloth with the wedge-tight scaffolding floor. A cloth with a cloth is used. If you want to use a cloth with a wide floor for a conventional wedge-tight scaffold, make sure that the width between the grips on both ends of the floor cloth is avoided from the wedge-shaped locking brackets on both ends of the arm lumber. There is an inconvenience to make a special product that is narrow.

  According to the invention of claim 2, the upper edge of the wedge guide member substantially coincides with the upper end of the arm lumber, and the wedge inserted into the wedge guide member is used for at least the frame scaffold of the entire upper edge when tightened. Thin steel plate for frame scaffolding that has a width that can be reassured by a person standing on the top, because the part where the gripping bracket of the cloth with a steel plate floor is placed is almost the same height as the upper edge of the wedge guide member There is an advantage that the members used for the frame scaffold such as morning glory for the wife side, curing frame, and sheet can be used as it is.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  The binding device in the wedge-type binding scaffold shown in FIGS. 1 to 8 includes a support metal (2) fixed to the outer periphery of a predetermined height of the support column (1) and an arm passed between the two support columns (1). It consists of a locking metal fitting (4) which is embedded in the end of the wood (3) so that the front side is exposed and is locked to the metal fitting (1). The support column (1) and the arm wood (3) are made of steel pipes having a predetermined length, and four steel support brackets (2) are arranged at the same height of the support column (1) as shown in FIG. It is fixed to the four sides by welding. Two of the four metal fittings (2) facing each other may be positioned one step below.

  The metal fitting (2) is U-shaped when viewed from the plane, and the central wall (5) is inclined forward and downward. The locking bracket (4) has a steel vertical wedge (8) and a central wall that protrudes downward from the arm lumber (3) in an inverted U shape when viewed from the plane and contacts the support column (1) when inserted into the receiving bracket A steel wedge guide member (9) having a wedge (8) inserted in a vertically movable manner and an upper end fixed to an upper portion of one side wall (6) of the wedge guide member (9). And has a retaining pin (10) along the inner surface of one side wall (6) at the lower end, and presses the wedge (8) to the extent that it can slide on the other side wall (11) of the wedge guide member (9). And a stainless steel leaf spring (12) (see FIG. 9) for urging the retaining pin (10) in the direction opposite to the one side wall (6) of the wedge guide member (9). . The wedge (8) has a length such that a part thereof protrudes above the wedge guide member (9) when the binding is released, and a part of the wedge (8) can protrude below the wedge guide member (9) when the binder is tightened. A vertical portion (35) in contact with the central wall (31) of (9) is provided at the front edge, and a front downward inclined portion (13) along the central wall (5) of the receiving metal fitting (2) is provided with the length of the rear edge. Prepared in the middle. A surface of the wedge (8) opposed to the inner surface of the one side wall (6) of the wedge guide member (9) and the adjacent surface portion (14) adjacent to the inner surface of the one side wall (6) of the wedge guide member (9); One side wall (6) of the guide member (9) has a separation surface portion (15) that is separated from the inner surface, and the rear side of the wedge guide member (9) faces downward on the rear upper edge of the receiving metal fitting (2). A step portion (16) is formed, and a downward portion from the downward step portion (16) of the wedge guide member (9) is an insertion portion (17) to the metal fitting (2). A pin housing hole (18) is formed in the insertion portion (17) portion of the one side wall (6) of the wedge guide member (9), and the wedge guide member (9) is formed on the rear upper edge of the receiving metal fitting (2). In a state where the downward stepped portion (16) is received, a pin receiving hole (7) is formed in one side wall of the receiving metal fitting (2) corresponding to the pin housing hole (18). The proximity surface portion (14) of the wedge (8) is close enough to push the retaining pin (10) against the spring force into the pin receiving hole (7) of the metal fitting (2), and the wedge separation surface portion (15 ) Are separated to the extent that the retaining pin (10) can be pulled out from the pin receiving hole (7) of the metal fitting (2) by spring force.

  The locking bracket (4) is provided at the end of the arm lumber (3) as follows. The arm wood (3) is made of steel pipe. Therefore, a steel vertical plate (21) having a U-shaped notch (19) as viewed from above at the end of the upper and lower opposing walls and having recesses (20) on both side edges at the bottom of both notches (19). The upper and lower ends of the vertical plate (21) are welded to the rear end of the upper portion of the wedge guide member (9) on both side walls (6) and (11) above the downward stepped portion (16). ) And the rear guide portions (22) of the wedge guide member (9) are fitted into the recesses (20) on both side edges of the vertical plate (21). The pipe end separation portions that are welded to the inner edge and that are opposite to each other on both sides of the notches (19) serve as both side surface cover portions (23) of the wedge guide member (9). The upper edge of the wedge guide member (9) slightly protrudes from the upper surface of the arm lumber (3), and the wedge (8) inserted into the wedge guide member (9) is a frame of the entire upper edge when fastened. The latter half portion of the cloth clamp with the thin steel sheet floor for the scaffold is formed in a shape that does not exceed the upper edge of the wedge guide member (9).

  The leaf spring (12) includes an upper end flange (25) hooked to the outer edge of a recess (24) formed on the upper end of one side wall (6) of the wedge guide member (9), and a retaining pin (10 ) Are attached to the lower end vertical portion (26), the lower portion of the flange portion (25), and a large first arcuate curved portion (27) convex to the wedge side, and a first arcuate curved portion ( 27) and the vertical portion (26), and includes a small second arcuate curved portion (28) convex on the side wall (6) side of the wedge guide member (9). By hooking the upper end flange (25) of the leaf spring (12) on the outer edge of the upper end recess (24) of the wedge guide member (9), the upper end of the leaf spring (12) is one side wall of the wedge guide member (9). (6) It is fixed to the upper part.

  A leaf spring insertion groove (29) of a length that allows the wedge (8) to move up and down is formed on the surface of the wedge (8) facing the inner surface of one side wall (6) of the wedge guide member (9). The leaf spring insertion groove (29) has an upper shallow bottom portion which becomes the proximity surface portion (14) of the wedge (8) and a lower deep bottom portion which becomes the separation surface portion (15) of the wedge (8), and both bottom portions are intermediate. Connected by an inclined bottom (30). In this embodiment, the leaf spring insertion groove (29) is formed, but this is not always necessary, and the groove (8) is opposed to the inner surface of the one side wall (6) of the wedge guide member (9). There may be a proximity surface portion (14) and a separation surface portion (15).

  At the upper end of the wedge (8), when the wedge (8) is about to come out downward from the wedge guide member (9), the wedge guide member (9) is hooked on the upper edge of the central wall (31) of the wedge guide member (9). A front projecting portion (32) is provided, and when the wedge (8) is about to come out from the wedge guide member (9) at the front lower end portion of the wedge (8), the wedge guide member (9) A wedge upper retaining left and right protruding portion (33) hooked on the lower edge of the side walls (6) (11) is provided. The wedge upper retaining projection (33) is provided by penetrating a pin in a left-right projecting manner in a through hole formed in the front lower end of the wedge (8).

  In the above description, in order to fasten the arm lumber (3) to the support column (1), the engagement of the arm bracket (4) of the arm lumber (3) to the bracket (2) of the support column (1) When the fastener (4) is inserted into the receiving metal fitting (2), the insertion portion (17) of the wedge guide member (9) is inserted into the receiving metal fitting (2) and the downward stepped portion (16) is inserted into the receiving metal fitting (2). Since it is received by the rear upper edge, the arm lumber (3) does not tilt, and its levelness is guaranteed. In this state, since the upper portion of the wedge (8) is held in a protruding shape from the wedge guide member (9) by the leaf spring (12), the wedge (8) is knocked down from above by the hammer. The front edge vertical portion (35) of the wedge guide member (9) is brought into close contact with the inner surface of the central wall (31), and the wedge (8) the inclined portion (13) of the rear edge is inclined forward and downward of the metal fitting (2). Close the inner wall (5) inside. As the wedge (8) is lowered, the side surface of the wedge (8) with respect to the retaining pin (10) at the lower end of the leaf spring (12) moves from the separation surface portion (15) to the proximity surface portion (14). (9) The retaining pin (10) in the pin housing hole (18) of the one side wall (6) is pushed into the pin receiving hole (7) of the receiving metal fitting (2) against the spring force. As a result of the above, due to the wedge action, the arm wood (3) is held firmly and firmly in a stable state with respect to the column (1), and the wedge (8) has some force superior to the spring force from below. Even if it is added upward, the retaining pin (10) on the side of the locking bracket (4) is caught on the upper edge of the pin receiving hole (7) of the receiving bracket (2), and the locking bracket (4) is There is no danger of slipping up from 2).

  To remove the locking bracket (4) of the arm lumber (3) from the bracket (2) of the support column (1), hit the lower end of the wedge (8) protruding downward from the bracket (2) with a hammer. When the wedge (9) is raised, the wedge action is released and the surface of the wedge (8) with respect to the retaining pin (10) at the lower end of the leaf spring (12) is separated from the proximity surface portion (14). In order to move to (15), the retaining pin (10) in the pin receiving hole (7) of the receiving metal fitting (2) is pulled out by the force of the leaf spring (12), and the pin receiving hole of the wedge guide member (9). Returned to (18). Then, since the wedge guide member (9) becomes free with respect to the receiving metal fitting (2), the locking metal fitting (4) can be removed from the receiving metal fitting (2). The binding of the arm wood (3) to 1) can be released.

  In this way, it is possible to eliminate both unexpected release of the arm wood (3) from the support post (1) and instability of the arm wood (3) with respect to the support post (1).

It is a horizontal sectional view which shows the arm lumber which exists separately from a support | pillar and a support | pillar. FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is a side view which shows the state just before tying an arm lumber to a support | pillar. FIG. 7 is a side view in which a part of the locking metal fitting is inserted into the metal fitting, and a part of the insertion portion of the wedge guide member is notched, showing a state where the downward stepped portion is received by the rear upper edge of the metal fitting. FIG. 5 is an enlarged sectional view taken along line VV in FIG. 4. It is the side view which notched a part which shows the state which lowered the wedge from the state of FIG. FIG. 7 is an enlarged cross-sectional view taken along line VII-VII in FIG. 6. FIG. 8 is an enlarged cross-sectional view taken along line VIII-VIII in FIG. 6. It is an expansion perspective view of a leaf | plate spring.

Explanation of symbols

(1) Support (2) Receiving bracket (3) Arm lumber (4) Locking bracket (5) Center wall of the receiving bracket (34) One side wall of the receiving bracket
(6) One side wall of wedge guide member (7) Pin receiving hole (8) Wedge (9) Wedge guide member (10) Retaining pin (11) Other side wall of wedge guide member (12) Leaf spring
(13) Wedge forward inclined portion (14) Wedge proximity surface portion (15) Wedge separation surface portion (16) Downward stepped portion of wedge guide member (17) Wedge guide member insertion portion (31) Center of wedge guide member Wall (35) Vertical part of the front edge of the wedge

Claims (6)

  A receiving bracket fixed to the outer periphery of the pillar at a predetermined height, and a locking bracket embedded in the end of the arm lumber passed between the two supports so that the front side is exposed and locked to the receiving bracket; The bracket is U-shaped when viewed from the plane and the central wall is inclined forward and downward, and the locking bracket protrudes downward from the arm lumber with a vertically long wedge and a reverse U-shape when viewed from the plane. The receiving bracket has a central wall that comes into contact with the column when inserted, and a wedge guide member in which the wedge is inserted so that it can move up and down, and an upper end fixed to the upper part of one side wall of the wedge guide member, along the inner surface of the one side wall And has a retaining pin at the lower end, and presses and holds the wedge against the other side wall of the wedge guide member so as to be slidable, and urges the retaining pin in the direction opposite to the one side wall of the wedge guide member. And a wedge, When it is lowered for tying, the front edge has a vertical part that contacts the central wall of the wedge guide member, and a forwardly inclined part along the center wall of the receiving bracket is provided in the middle of the length of the rear edge. The wedge guide member has an adjacent surface portion close to the inner surface of the one side wall of the wedge guide member and a separating surface portion spaced from the inner surface of the one side wall of the wedge guide member below the wedge surface facing the inner surface of the one side wall. On the rear side, a downward stepped portion is formed that is received by the upper upper edge of the receiving bracket to ensure the level of the arm lumber, and the downward direction from the downward stepped portion of the wedge guide member is an insertion portion to the receiving bracket. The insertion portion on one side wall of the wedge guide member is formed with a left and right penetrating pin storage portion, and the lower stepped portion of the wedge guide member is received by the upper edge of the rear portion of the reception bracket. Pi on the side wall A pin receiving portion is formed corresponding to the storage portion, and the pin receiving portion has an upper edge on which the retaining pin that the locking metal fitting tries to come out upward from the receiving metal fitting is caught. The proximity surface part is close enough to push the retaining pin against the spring force against the pin receiving part of the bracket, and the wedge separation part can pull the retaining pin from the pin receiving part of the bracket by the spring force. Tightening device in a separate wedge-tightening scaffold.   The upper edge of the wedge guide member almost coincides with the upper end of the arm lumber, and the wedge inserted into the wedge guide member is gripped by at least the upper edge of the wedge with the thin steel steel floor for the frame scaffolding. The binding device for a wedge-tightening type scaffold according to claim 1, wherein a portion on which the metal fitting is applied is formed in a shape that is substantially the same height as the wedge guide member.   A leaf spring insertion groove having a length at which the wedge can move up and down is formed on the surface of the wedge opposite to the inner surface of one side wall of the wedge guide member, and the leaf spring insertion groove is an upper portion serving as a proximity surface portion of the wedge. The binding device for a wedge-binding scaffold according to claim 1 or 2, wherein the binding device has a shallow bottom portion and a lower deep bottom portion serving as a wedge separation surface portion, and both bottom portions are connected by an intermediate inclined bottom portion.   A leaf spring occupies the upper end hook part that is hooked on the outer edge of the recess formed on the upper end of one side wall of the wedge guide member, the vertical part to which the retaining pin is attached, and most of the lower part of the hook part. A large first arc-shaped curved portion convex to the side, and a small second arc-shaped curved portion that is between the first arc-shaped curved portion and the vertical portion and is convex on one side wall side of the wedge guide member. Item 4. The binding device in the wedge-binding scaffold according to item 1, 2 or 3.   At the upper end of the wedge, there is a wedge-preventing protruding protrusion that is hooked on the upper edge of the central wall of the wedge guide member when the wedge is about to fall out from the wedge guide member, and at the lower end of the wedge 5. A wedge upper retaining left and right protruding portion that is hooked on a lower edge of each side wall of the wedge guide member when the wedge is about to come out from the wedge guide member is provided. Tightening device for no wedge binding type scaffolding. Arm wood is made of a metal tube, and the upper and lower ends of the vertical plate are welded to the bottom of the metal tube with a U-shaped notch when viewed from the top, with recesses on both sides at the bottom of both notches. A rear projecting portion that fits tightly into the recesses on both side edges of the vertical plate is provided at the rear end of the wedge guide member above the lower stepped portion on both side walls, and both rear projecting portions of the wedge guide member are provided on both sides of the vertical plate. 6. The metal pipe end separation portion that is fitted into the recess and is welded to the inner edge of the recess, and the opposing metal tube end separation portions on both sides of the both notches are the cover portions on both sides of the wedge guide member. Tightening device for wedge-tightening scaffolds as described in 1.

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