JP5912862B2 - Connecting restraint - Google Patents

Description

  The present invention relates to a connection restraint device for restraining the connection of pedestals used in a temporary scaffolding or the like at a construction site.

  Temporary scaffolds and the like at construction sites are often assembled by connecting a plurality of tubular pedestals. The connection of the pedestal is made by fitting the end (connection) of the other pedestal to a short pipe joint (connection) provided at the end of one limb.

  At this time, in order to stably maintain the connection between the pedestals, a connection restraint tool is used in which lock pins are inserted into the connection portions to restrain the connection. This connection restraint has various forms, for example, there are descriptions related to the following patent documents.

JP-A-7-166695 JP-A-10-183990 JP 2005-207535 A

  Japanese Patent Application Laid-Open No. H10-228667 describes a connection restraint device in which a pair of lock pins manufactured separately and a cross-linked piece for cross-linking them are combined. Since this connecting restraint tool is manufactured by separately manufacturing lock pins and bridge pieces having complicated shapes, the manufacturing cost is high.

  Patent Document 2 and Patent Document 3 describe a connection restraint tool in which a metal plate is punched (or cut) into a specific shape and a lock pin or the like is formed by bending the plate piece in a complicated manner. This connection restraint tool has a low material yield due to the unique punching shape of the plate material, and requires a large number of man-hours for complicated bending, and the manufacturing cost is also high.

  This invention is made in view of such a situation, and it aims at providing the connection restraint tool which not only can restrain the connection of pedestals reliably but can also be manufactured at lower cost than before. .

  As a result of extensive research and trial and error, the present inventor has formed a lock pin by drawing the end side of a strip-shaped metal piece, and then bending the intermediate side thereof. I came up with the idea that a connecting restraint can be easily obtained. By developing this result, the present invention described below has been completed.

《Coupling restraint》
(1) The connection restraint tool of the present invention is connected to a pair of opposed first engagement holes provided in a cylindrical first connection portion at an end of the first pedestal and the first pedestal. A pair of opposing second engagement holes provided at the end of the second pedestal and provided in a cylindrical second connection part fitted over the first connection part and aligned with the first engagement hole; A pair of lock pins that can be fitted, and a bridging band that bridges between the pair of lock pins, can be accommodated in the first connecting portion to restrain the connection between the first pedestal and the second pedestal In the coupling restraint device, the lock pin is a convex protrusion on the end side of a metal strip , and the bridging strip is a central side of the strip having a bent shape , and the lock pin The cylindrical portion, the insertion guide surface that continues from the cylindrical portion to the tip side of the convex protrusion, and the both ends of the insertion guide surface that extend from the cylindrical portion to the tip side of the convex projection. The insertion guide surface is slidably brought into contact with the inner peripheral edge of the second connection portion when the second connection portion is inserted into the first connection portion. The release guide surface is guided to the inner side of the first connecting portion, and the release guide surface slides on the inner peripheral edge of the second engagement hole when releasing the restraint between the first engagement hole and the second engagement hole. The lock pin is brought into contact with and retracted to the inside of the first connecting portion .

(2) The connection restraint device of the present invention can be manufactured with a very small number of man-hours by plastic processing of a metal strip, without the need to manufacture the lock pin as a separate member or complicated punching or bending. It is. Further, since the strip is obtained by cutting a metal plate or the like into a strip shape, the material can be used without waste, and a special punching die or the like is unnecessary. As described above, according to the present invention, it is possible to manufacture the connection restraint tool with a small number of man-hours while ensuring a high material yield, and the manufacturing cost can be greatly suppressed.

<Others>
In the present invention, “first” or “second” is a convenient name for members and parts, and is appropriately omitted. For example, when it is not necessary to particularly distinguish the first pedestal and the second pedestal, one or both of them is simply referred to as a pedestal. The same applies to other parts.

It is a perspective view which shows the connection restraint tool which is one Example which concerns on this invention. It is a perspective view which shows the 1st leg pillar and 2nd leg pillar connected with the connection restraint tool. It is sectional drawing which shows a mode that the connection restraint tool was mounted | worn with the 1st pedestal. It is sectional drawing which shows a mode that the 2nd pedestal is connected and restrained by the 1st pedestal with which the connection restraint tool was mounted | worn. It is an expanded sectional view which shows the lock pin periphery of the connection restraint tool with which the 1st leg pillar and the 2nd leg pillar were mounted | worn.

  The contents described in this specification can be appropriately applied not only to the coupling restraint of the present invention but also to the manufacturing method thereof. A component related to a manufacturing method can be a component related to an object if understood as a product-by-process claim. One or two or more components arbitrarily selected from the present specification can be added to the above-described components of the present invention. Which embodiment is the best depends on the target, required performance, and the like.

《Coupling restraint》
The connection restraint tool of the present invention basically includes a pair of lock pins and a cross-linking band that cross-links between them. This connection restraint tool is formed by plastic working a metal strip. In particular, the lock pin can be obtained by drawing a strip, and the bridging zone can be obtained by bending it. Hereinafter, these embodiments will be specifically described.

(1) Band-shaped piece Although the material of a band-shaped piece does not ask | require, the material which exhibits high elasticity, high (fatigue) strength, high ductility, etc. is preferable. For example, if the strip is a highly elastic material, the lock pin is urged from the inner peripheral surface side of the pedestal to the outer peripheral surface side by the bridging band to maintain a stable protruding state even when the connecting restraint tool is used repeatedly. Can do. Further, when the belt-like piece is a high-strength material, the lock pin can withstand a large shearing force received from the engaging hole of the inserted pedestal. Furthermore, if the strip is a highly ductile material, drawing can be performed without causing cracks and the like, and high workability can be obtained. Examples of such materials include carbon steel, alloy steel such as spring steel, and stainless steel. The strip may be subjected to an appropriate heat treatment after plastic working.

  The shape of the strip is not limited. By using a strip-like piece having a simple shape such as a strip shape (long rectangular shape on one side), the material yield and workability can be improved.

(2) Lock pin The lock pin is a protrusion formed by drawing the vicinity of the end of the strip piece into a convex shape. A pair of lock pins protruding in the same direction is formed by performing this drawing from the same surface side of both ends of the strip. When the strip-shaped piece after the drawing is bent so that the back side of the lock pin is inward, a connecting restraint in which each lock pin protrudes outward is obtained.

  The lock pin according to the present invention is not limited to its specific form, but the engagement with the first engagement hole and the second engagement hole (mountability), and the posture when fitting into the engagement hole It is preferable to have a shape suitable for stability, releasability (removability) from the engagement hole, and the like.

  For example, when the second connecting portion is fitted into the first connecting portion, the lock pin slides and contacts the inner peripheral edge of the second connecting portion (opening end) to retract the lock pin to the inside of the first connecting portion. It is preferable that the insertion guide surface (cam surface) is provided on the center side of the bridging zone. When the second connecting portion is inserted into the first connecting portion, the lock pin automatically retracts temporarily through the insertion guide surface, and then automatically returns to automatically insert into the second engagement hole. Then, the connection between the first pedestal and the second pedestal is locked. Note that the insertion guide surface can be constituted by, for example, a flat surface or a curved surface having an appropriate gradient. The curved surface is preferably a curved surface along the inner peripheral edge of the second connecting portion.

  The lock pin is slidably contacted with the inner peripheral edge of the second engagement hole when releasing the restraint between the first engagement hole and the second engagement hole and retracts the lock pin to the inside of the first coupling portion. It is preferable to provide a release guide surface on the longitudinal side of the cross-linking zone. When separating the connected first pedestal and second pedestal, if the second connecting part is rotated relative to the first connecting part, the lock pin is automatically released via the release guiding surface (cam surface). And the state is maintained. Thus, the locked state of the first pedestal and the second pedestal is released, and both pedestals can be easily separated. Note that the insertion guide surface can also be constituted by, for example, a flat surface or a curved surface having an appropriate gradient. The curved surface is preferably a curved surface along the inner peripheral edge of the second engagement hole. The release guide surface may be provided only on one side or both sides of the lock pin. If provided on both sides, the restraint by the joint restraint can be released regardless of which direction the second joint is rotated.

(3) Bridging band The bridging band is formed by bending the remaining part of the band-shaped piece other than the lock pin. This bent shape may be rectangular or curved, for example. Such a shape of the bridging band is appropriately referred to as a substantially U shape. For example, the bridging band may be shaped when it has a curved portion obtained by curving a band-like piece at the approximate center. This curved portion widens the flexible range of the bridging band. In addition, bending the strip piece in a curved shape is easier to process and has a wider allowable tolerance range than bending it into a rectangular shape or the like.

  Furthermore, when a bending part is provided in the bridging band, it is preferable that a bending part obtained by bending a band-like piece is provided between the bending part and the lock pin. By providing this bent portion, the portion from the bent portion to the lock pin (this portion is referred to as “front extending portion”) extends along the inner peripheral surface of the first connecting portion in the axial direction of the first connecting portion. Will come to exist. As a result, the lock pin is urged in a stable posture in a direction orthogonal to the axial direction (simply referred to as “axial orthogonal direction”), and not only to the first engagement hole but also to the second engagement hole. Also become easier to engage. On the contrary, when the lock pin is retracted into the first connecting portion, the bent portion serves as a fulcrum, so that the lock pin moves smoothly.

  It is preferable that the bridging band further has a forward extending portion that extends from the lock pin to the distal end side of the band-like piece and stabilizes the posture of the lock pin that is fitted in the first engagement hole and the second engagement hole. Similarly to the forward extension part, the forward extension part also extends in the axial direction along the inner peripheral surface of the first connecting part. For this reason, even when an unintended external force is applied to the lock pin inserted through the engagement hole, the rotation of the lock pin is restricted by the extended portion, and the posture in the direction perpendicular to the axis is stably maintained. . As a result, the connection restraint tool can more reliably restrain (lock) the connected state of the first pedestal and the second pedestal.

《Pole Pillar》
The pedestal concerning the present invention does not ask the concrete form. The connecting portion has a cylindrical shape (pipe shape), but the main body portion connected to the connecting portion does not necessarily have a pipe shape, and the cross-sectional shape of the connecting portion is not limited to a circular shape but may be a square shape or the like. However, usually, the whole (the connecting portion and the main body) is often circular.

  Since the second connecting portion is fitted on the first connecting portion, the outer diameter of the first connecting portion is substantially equal to or slightly smaller than the inner diameter of the second connecting portion. If the main body of the first pedestal and the second pedestal has the same diameter cylindrical shape, a joint pipe having a smaller diameter than that is fixed to the end of the first pedestal to form the first connection part, and the first connection What is necessary is just to insert the edge part (2nd connection part) of a 2nd pedestal into a part, and to connect both.

  The pedestal according to the present invention may be used for any purpose, but can be connected and disconnected, and thus is suitable for a temporary scaffold at a construction site, for example. In addition, it can be used for various temporarily installed buildings (temporary stage, temporary tent, etc.).

《Coupling restraint》
The present invention will be described more specifically with reference to examples. The perspective view of the connection restraint tool 3 which is one Example which concerns on this invention was shown in FIG. Moreover, the mode that the connection restraint tool 3 is mounted on the first pedestal 1 and the second pedestal 2 is shown in FIGS. 2, 3A and 3B. Further, FIG. 4 shows an enlarged cross-sectional view of a part of the connecting restraint 3 attached to the first pedestal 1 and the second pedestal 2. In addition, the 1st pedestal 1 and the 2nd pedestal 2 are support | pillars of the temporary scaffold used in a construction site etc.

  The connecting restraint tool 3 is formed by cold-working a strip-shaped strip W made of a stainless steel plate in a cold manner, and a pair of lock pins 31 projecting outward and facing each other, and a bridging band that bridges between the lock pins 31. 33. In the present specification, only one of a pair of symmetrical members and portions will be described for convenience.

  The lock pin 31 has a substantially bottomed cylindrical convex shape. Specifically, a cylindrical portion 314, an insertion guiding surface 312 that extends from the cylindrical portion 314 to the outer distal end side, a release guiding surface 311 that continues from the cylindrical portion 314 to the outer distal end side and continues to the left and right sides of the insertion guiding surface 312; The cylindrical portion 314 includes a constraining surface 313 having a circular arc shape that extends from the lower surface side to the outer tip side. The protruding amount of the cylindrical portion 314 is approximately equal to the thickness of the first connecting portion 11 fixed to the first pedestal 1 (see FIG. 4).

  The bridging band 33 includes a curved portion 330 at the center, a bent portion 332 provided on the way from the bent portion 330 to the lock pin 31, and an open leg-shaped leg portion 331 that connects the curved portion 330 to the bent portion 332. And a forward extending portion 333 extending in the vertical direction (axial direction) connecting the lock pin 31 from the bent portion 332 and a forward extending portion 334 extending in the vertical direction from the lock pin 31 to the tip end portion of the strip-shaped piece W. Become. The bridging band 33 is an elastic body rich in flexibility and resilience.

<Action>
Next, the operation of the connection restraint 3 will be described. The connection restraint tool 3 is reduced in width and inserted into the first connection portion 11 provided at the end of the first pedestal 1 (see FIGS. 2 and 3A). The reduced width of the connection restraint tool 3 can be achieved by clamping the highly elastic leg 331. The first leg 1 and the second leg 2 have a cylindrical shape with the same inner and outer diameters, and the first connecting portion 11 is located on the inner peripheral side of the first leg 2 and the second leg 2. It has a circular tube to be inserted. The first connecting portion 11 is fixed by welding while being fitted to the end of the first pedestal 1. A portion of the second pedestal 2 that fits into the first connecting portion 11 is referred to as a second connecting portion 21.

  When the connection restraining tool 3 in the reduced width state is inserted into the first connection portion 11, when the lock pin 31 reaches the first engagement hole 111 of the first connection portion 11, the lock pin 31 is the first. It will be in the state fitted in the engaging hole 111. At this time, the forward extension portion 333 and the forward extension portion 334 of the connection restraint device 3 are in contact with the inner peripheral surface of the first connection portion 11, and the connection restraint device 3 is stably held in the first connection portion 11. (See FIG. 3A). As a result, the posture of the lock pin 31 protruding in the direction perpendicular to the axis from the first engagement hole 111 is also stabilized.

  When the second connecting portion 21 of the second pedestal 2 is externally fitted to the first connecting portion 11 in this state, the inner peripheral edge of the opening end of the second connecting portion 21 is the insertion guiding surface of the lock pin 31. Abuts 312 and slides. Since the insertion guide surface 312 is a slope inclined in the traveling direction of the second connecting portion 21, an inward rotational force with the bent portion 332 serving as a fulcrum is applied to the insertion guiding surface 312 due to the progress of the second connecting portion 21. Works. Thereby, the lock pin 31 is retracted into the second connecting portion 21 by the rotation thereof. When the lower end portion of the second engagement hole 211 passes through the restraining surface 313 of the lock pin 31, the lock pin 31 returns and the lock pin 31 is also fitted into the second engagement hole 211 (see FIG. 3B). In this way, the first pedestal 1 and the second pedestal 2 are connected by the first connecting portion 11 and the second connecting portion 21, and the connection is made between the lock pin 31, the first engaging hole 111 and the first connecting hole 3 of the connecting restraint tool 3. It is in a state of being restrained (locked) by engagement with the two engagement holes 211.

  At this time, the upward movement of the second engagement hole 211 of the second connecting portion 21 is reliably restricted by the restraining surface 313 extending in the axis orthogonal direction. Accordingly, the first pedestal 1 and the second pedestal 2 are not easily separated in this state. Moreover, even if an upward force is applied to the second engagement hole 211 (the direction in which the first pedestal 1 and the second pedestal 2 are separated), the protracted portion 334 is formed on the inner peripheral surface of the first connecting portion 11. By contacting (and the cylindrical portion 314 contacts the first engagement hole 111), rotation of the lock pin 31 (left rotation in FIG. 4) is suppressed, and the posture of the lock pin 31 is stably maintained. Is done. Therefore, the connection restraint state of the first pedestal 1 and the second pedestal 2 is not easily released.

  On the contrary, when the connection between the first pedestal 1 and the second pedestal 2 is to be released, the second linking part 21 is rotated clockwise or counterclockwise. Then, the inner peripheral edge of the second engagement hole 211 comes into contact with the release guide surface 311 of the lock pin 31 and slides. Since the release guide surface 311 is a slope inclined in the rotation direction of the second connecting portion 21, an inward rotational force acts on the release guide surface 311 along with the rotation of the second connecting portion 21, and the lock pin 31 The retraction movement is started inside the second connecting portion 21 by the rotational force. When the second connecting portion 21 is rotated until the engagement between the second engaging hole 211 and the lock pin 31 is lost, the lock pin 31 is held in the retracted state by the inner peripheral surface of the second connecting portion 21. Thus, the first leg 1 and the second leg 2 are separated from each other by releasing the connection restrained state by the lock pin 31.

  By the way, the drawing of the lock pin 31 is performed by press-molding the strip-like piece W using a punch along the inner shape of the lock pin 31 and a die having a cavity along the outer shape of the lock pin 31. It can be done easily. Bending of the bridging band 33 can be easily performed if the band-shaped piece W is pressure-molded using a mold that conforms to the inner shape or the outer shape thereof. The order of the drawing process of the lock pin 31 and the bending process of the bridging band 33 is not limited, but it is usually efficient to perform the bending process of the bridging band 33 after the drawing process of the lock pin 31.

  Each plastic working can be performed in a cold state, but may be performed in a warm state or a hot state. Further, after the processing, various heat treatments may be appropriately performed to adjust the mechanical properties and the metal structure of the connection restraint tool 3.

  Thus, if the connection restraint tool of this invention is used, it can connect reliably and restraint between leg columns, suppressing manufacturing cost.

DESCRIPTION OF SYMBOLS 1 1st leg pillar 11 1st connection part 111 1st engagement hole 2 2nd leg pillar 21 2nd connection part 211 2nd engagement hole 3 connection restraint tool 31 Lock pin 33 Bridging band 330 Bending part 332 Bending part 334 tip Extension W Strip

Claims (3)

A pair of opposed first engaging holes provided in a cylindrical first connecting portion at an end of the first pedestal and an end of the second pedestal connected to the first pedestal; A pair of lock pins that can be fitted into a pair of opposed second engagement holes that are provided in a cylindrical second connection part that is externally fitted to the first connection part and that are aligned with the first engagement hole;
A cross-linking zone that cross-links between the pair of lock pins,
A coupling restraint tool that is accommodated in the first coupling portion and can restrain the coupling between the first pedestal and the second pedestal,
The lock pin is a convex protrusion on the end side of the metal strip.
The bridging band is a central side of the band-shaped piece having a bent shape ,
The lock pin includes a cylindrical portion, an insertion guide surface that extends from the cylindrical portion to the distal end side of the convex protrusion, and that extends from the cylindrical portion to the distal end side of the convex protrusion and on both sides of the insertion guide surface. A series of release guide surfaces,
The insertion guide surface slides into contact with the inner peripheral edge of the second connecting portion when the second connecting portion is inserted into the first connecting portion, and retracts the lock pin to the inside of the first connecting portion. And
The release guide surface is slidably contacted with an inner peripheral edge of the second engagement hole when releasing the restraint between the first engagement hole and the second engagement hole, and the lock pin is connected to the first connection portion. A connecting restraint that is retracted and guided inside . The bridging zone is
A curved portion obtained by bending the belt-like piece at a substantially center;
A bent portion obtained by bending the belt-like piece between the curved portion and the lock pin;
The connection restraint tool according to claim 1 provided with. Furthermore, it has a pre-extension part which extends from the said lock pin to the front end side of the said strip | belt-shaped piece, and stabilizes the attitude | position of this lock pin inserted in the said 1st engagement hole and the said 2nd engagement hole. The connection restraint tool of 1 or 2 .

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