JP2543644B2 - Connecting pin for scaffolding frame - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting pin for a scaffolding construction frame for temporary construction, which is suitable for sequentially connecting upwards.

[0002]

2. Description of the Related Art In a construction site of a building, in order to sequentially assemble the scaffold building frames upward, it is naturally necessary to provide a connecting means for connecting the scaffold building frames facing each other vertically.

Conventionally, as this connecting means, connecting pins are provided at the upper and lower ends of the scaffolding building frame on the lower side, and the left and right lower end parts of the upper side scaffolding frame are inserted into the connecting pins. Of a type in which a locking arm for preventing slipping is locked from the side surface to connect the both, or, for example, a connecting pin is loosely fitted between upper and lower scaffolding building frames as shown in Japanese Utility Model Laid-Open No. 1-131753. , A type has been proposed in which the scaffolding building frame and the connecting and recessing portions provided on the connecting pin are engaged with each other by rotating the connecting pin by a required angle, and the upper and lower scaffolding building frames are connected to each other by rotating the connecting pin. .

[0004]

In each of the above-mentioned prior arts, in addition to the work of inserting the upper scaffolding frame into the connecting pins of the lower scaffolding frame, these upper and lower scaffolding frames are separately provided. It is necessary to lock the lock arm to the left and right between the two while holding, and to rotate the left and right connecting pins between them, and at least two workers are required to perform the connecting work. However, there is a problem that the connecting work is troublesome and inefficient.

The present invention has an object to solve these problems.

[0006]

In order to solve the above-mentioned problems, the present invention is provided with the reference numerals shown in the embodiments,
According to claim 1, the hollow pin body 1 such as a tubular body is provided with
An engaging projection 2 protruding from the side surface and capable of retracting from the side surface into the inside of the pin body 1, and the projection 2 on the pin body 1
And a spring 3 for urging and projecting from the side surface of the
The sliding surface 4 for loading the retraction force inside the pin body 1 against the urging force of the spring 3 by the protrusion 2, and the sliding surface 4
Formed on the way to the inside of the pin body 1
The engaging step portion 8 for engaging with the retracted position in the direction, and when the engaging projection 2 projects from the side surface of the pin body 1, the engaging projection 2 engages with the scaffolding frame and the engaging projection 2 of the spring 3 is engaged. A structure is provided in which an engagement surface 5 that releases the engagement with the scaffolding construction frame by pressing it against the urging force is adopted.

Further, in the present invention, the engaging projection 2
The guide protrusion 6 integrally formed with the pin body 1 for preventing displacement of the engagement protrusion 2 in the lateral direction orthogonal to the axial direction is integrally formed with the pin body 1. is there.

According to a third aspect of the present invention, the guide projection 6 is formed integrally with the engagement projection 2 via a connecting rod portion 7 extending in the axial direction along the inner wall of the pin body 1. The configuration described in 2 is adopted.

Further, according to a fourth aspect, the engaging projection 2
7. A locking surface portion 19 is provided continuously with the rear end of the sliding surface 4 for locking the pin body 1 when the engaging projection 2 is projected to receive the axial load of the engaging projection 2. The scaffolding frame connecting pin according to any one of 1 to 3.

Further, in the present invention, the engaging projection 2
Continuing on from the tip of the engaging surface 5 of the
The sub-sliding surface 9 for loading the retraction force is provided inside the pin body 1 against the biasing force of the above.

[0011]

According to claim 1 of the present invention, the lower scaffold building frame b
To the pin body 1 whose lower end side is connected to the vertical pipe 10 of
By inserting the lower end portion of the vertical pipe 10 of the upper side scaffolding frame a, the lower end portion of the vertical pipe 10 comes into contact with the sliding surface 4 of the engaging projection 3 during insertion, and the sliding surface 4 is contacted by the corresponding contact force. Since the projection 2 is loaded into the pin body 1 against the urging force of the spring 3 and the engagement projection 2 retracts into the pin body 1, the lower end of the vertical pipe 10 is It is allowed to be inserted into the lower pin body 1, and when it is inserted to a position where the engaging protrusion 2 of the lower vertical pipe 10 faces the engaging hole 11 of the lower end side surface of the upper vertical pipe 10. Since the engaging protrusion 2 is released from the retreating urging force of the upper vertical pipe 10, the engaging protrusion 2 is urged by the spring 3 and protrudes to engage with the engaging hole 11, that is, the engaging The inner surface of the engaging hole 11 engages with the engaging surface 5 of the projection 2 so that the upper and lower scaffold building frames a,
b will be connected to each other. That is, simply inserting the lower end of the upper vertical pipe 10 into the pin body 1 of the lower vertical pipe 10 will automatically connect the two.

Further, according to claim 1, an engaging step for engaging the engaging projection 2 with the retracted position of the pin body 1 in the inward direction is provided on the way of the sliding surface 4 of the engaging projection 2. Since the portion 8 is formed, the engaging projection 2 can be maintained in the retracted state inside the pin body 1 only by directly pressing the engaging projection 2 inward of the pin body 1. The scaffolding frame on the upper side can be easily disassembled from the scaffolding frame on the lower side.

Further, with the engagement step portion 8 of the engagement protrusion 2 engaged with the inner peripheral surface 23 of the pin body 1 and the engagement protrusion 2 in the retracted position, the scaffolding frame a is pinned again. By inserting into the main body 1, the lower end of the scaffolding construction frame a pushes the slightly projecting tip of the engaging projection 2 downward during insertion, which causes the engaging step 8 of the engaging projection 2. Is the pin body 1
Since it disengages from the inner peripheral surface 22 and is released from the retracted position, the engaging projection 2 projects from the side surface of the pin body 1,
The engaging protrusions 2 automatically engage with the engaging holes 11 of the scaffolding frame a while the scaffolding frame a is being inserted.

According to the second aspect of the present invention, since the engaging projection 2 is supported by the pin body 1 by the guide projection 6 so as to prevent lateral displacement, even if the vertical pipe 10 receives a load. It is possible to accurately perform the projecting operation from the side surface of the pin body 1 and the retracting operation to the inside of the pin body 1, and it is possible to maintain the engagement state of the engagement protrusion 2 with the vertical pipe 10 in a good condition.

Further, according to claim 3, since the engaging projection 2 is formed on the integrated structure 12 with the guide projection 6 via the connecting rod portion 7, the external force from the upper side scaffolding frame is strongly received. Exert an effect.

According to a fourth aspect of the present invention, the engagement protrusion 2 is continuously connected to the rear end of the sliding surface 4 of the engagement protrusion 2 and is engaged with the pin body 1 when the engagement protrusion 2 is projected. Since the engaging surface portion 19 for receiving the axial load is provided, the engaging projection 2 is biased by the spring 3 and protrudes, so that the engaging projection 2 is directly engaged with the pin body 1 and the shaft thereof. Since the load in the direction, that is, the load in the pulling-out direction of the scaffolding frame a is received, the locking action is surely performed.

According to a fifth aspect of the present invention, a repulsive force is applied to the inside of the pin body 1 continuously from the engaging surface 5 of the engaging protrusion 2 against the biasing force of the spring 3. Since the sub-sliding surface 9 is provided for the purpose of
When the vertical pipe 10 is pulled out from the pin body 1 even if the tip portion of the engaging projection 2 slightly protrudes from the side surface of the pin body 1 in the state of retracting inside the pin body 1 due to the action of By the action of the surface 9, the engaging projection 2 is made to retract into the pin body 1 against the biasing force of the spring 3, so that the vertical pipe 10 can be pulled out from the pin body 1 without any trouble.

[0018]

EXAMPLE FIG. 1 shows a state before the scaffolding frame a on the upper side and the scaffolding frame b on the lower side are connected to each other. It consists of a horizontal pipe 13 to be connected and reinforcing bars 14, 14 mounted between the vertical and horizontal pipes 10, 13, and a scaffolding plate 15 is suspended on the horizontal pipe 13 by engaging its claws 15a with the horizontal pipe 13. An engaging hole 11 is formed at the lower end of the vertical pipes 10, 10 facing the scaffolding plate 15 side, and the connecting pin 16 according to the present invention is inserted between the upper and lower vertical pipes 10, 10. It is like this.

A connecting projection 17 is provided near the lower end of the pin body 1 of the connecting pin 16 so as to project from its side surface, and the connecting projection 8 is provided near the upper ends of the lower vertical pipes 10, 10. A connecting hole 18 that engages is formed.

FIG. 2 shows the external appearance of the connecting pin 16 inserted between the vertical pipes 10, 10 of the upper and lower scaffold building frames a, b, and FIG. 3 shows the internal structure of the connecting pin 16. The connecting pin 16 has a tubular pin main body 1 which penetrates vertically in its entirety, and the pin central portion 1a is formed by meat pressure to form outer peripheral step portions 1d and 1e between the pin upper portion 1b and the pin lower portion 1c. The vertical pipe 10 of the upper scaffolding frame a inserted into the pin upper portion 1b and the vertical pipe 10 of the lower scaffolding frame b inserted into the pin lower portion 1c have their respective end surfaces at the outer peripheral step portion 1.
d, 1e are positioned, and the engaging projections 2 projecting from the pin main body 1 engage with the engaging holes 11 at the lower end of the vertical pipe 10 at that position, and the vertical pipe 10 of the lower scaffolding building frame b is engaged. The projection 17 for connecting the pin body 1 is provided in the connecting hole 18 at the upper end.
Are to be engaged.

As shown in FIG. 4 in particular, the engaging projection 2 has a sliding surface 4 formed on the upper surface side of the tip end thereof as a flat or slightly rounded downward sloping surface. The rear end of the surface 4 has a horizontal engaging surface portion 19, and an engaging surface 5 parallel to the engaging surface portion 19 is provided on the lower surface side of the engaging protrusion 2. 5 has a sub-sliding surface 9 that is an upwardly inclined surface that is continuous with the tip end portion of 5. In addition, the engaging projection 2 is integrally formed with a connecting rod portion 7 extending downward from a base end portion thereof and a guide projection 6 protruding from a lower end portion of the connecting rod portion 7 in the same direction as the engaging projection 2 and shorter than the protrusion 2. Is formed into a substantially U-shaped thick metal monolithic structure 12, and one end of the substantially U-shaped leaf spring 3 is fixed to the back side thereof by caulking or spot welding. Alternatively, a small hole provided in the leaf spring 3 is engaged with a protrusion provided on the back side thereof to cooperate with each other, and the other end of the leaf spring 3 is connected to the pin upper portion 2b.
It is brought into contact with the inner peripheral surface of the metal plate without being fixed, so that the engaging projections 2 constituting the metal integrated structure 12 are the leaf springs 3.
Of the pin body 1 is protruded from the side surface of the pin upper portion 1b of the pin body 1, and the guide protrusion 6 is formed by the thick portion 1a of the pin body 1.
The guide hole 20 is always engaged. It is preferable that the guide protrusion 6 is immersed in the thickness of the thick portion 1a, but the tip portion may slightly project from the outer surface of the thick portion 1a.

The sliding surface 4 of the engaging projection 2 is provided with an engaging step portion 8 having an important function as described later.

Further, a pair of connecting protrusions 17 on the pin lower portion 1c side of the pin body 1 are provided on the left and right, and both connecting protrusions 17 are fixed at both ends by a leaf spring 21 having a substantially U-shaped cross section as described above. Alternatively, they are linked with each other by engagement, and the connecting projections 17 are biased by the leaf spring 21 so as to project from the side surface of the pin lower portion 1c.

In use, first, the pin lower portion 1 of the pin body 1
c is a leaf spring 2 having a connecting protrusion 17 protruding from its side surface.
1 is inserted into the upper end of the vertical pipe 10 of the lower scaffolding building frame b in a state of being retracted into the pin body 1 against the urging force of 1, and the connecting projection 17 is engaged with the connecting hole 18 of the vertical pipe 10. To combine. As a result, the pin body 1 is attached to the upper end portion of the vertical pipe 10, and thereafter it is not necessary to remove it even when it is not used.

Next, as shown in FIG. 5, the upper side scaffolding frame a
The vertical pipe 10 is inserted into the pin upper portion 1b of the pin body 1 attached to the lower scaffolding building frame b, so that the sliding surface 4 that is the tip end inclined surface of the engaging projection 2 is inserted in the middle of the insertion.
The lower end of the vertical pipe 10 comes into contact with the engaging portion 2 and the engaging projection 2 receives a load that causes it to retract into the pin body 1 against the biasing force of the leaf spring 3, and this retracting biasing force causes the engaging protrusion 2 to retract. The engaging protrusion 2 is retracted into the pin body 1 to move the vertical pipe 1
The lower end portion of 0 is allowed to be inserted into the upper pin portion 1b of the pin body 1 until it abuts on the step portion 1d.
When the lower end of the vertical pipe 1 abuts on the stepped portion 1d, the vertical pipe 1
The engaging protrusion 2 of the pin body 1 faces the engaging hole 11 on the 0 side surface, and the engaging protrusion 2 is released from the retracting biasing force of the vertical pipe 10. The upper and lower scaffolding frames a and b are connected to each other by being urged to project to engage with the engaging hole 11 and the engaging surface 5 abuts the inner edge of the engaging hole 11 so that it cannot be extracted. Will be. That is, the both ends are automatically connected only by inserting the lower end of the vertical pipe 10 of the upper scaffolding frame a into the pin body 1 of the lower scaffolding frame b. Since the engagement protrusion 2 is formed on the thick metal integrated body 12 as described above and has a rectangular shape in a front view as shown in FIG. 2, the vertical pipe side engagement hole 11 with which the engagement protrusion 2 engages is formed. As shown in FIG. 2, it may be formed in a similar rectangular shape with some allowance in the upper and lower sides, or at least the lower inner edge of the engagement hole 11 may be formed in a straight shape to prevent rattling. Is also preferable.

According to the embodiment of the present invention, when the vertical pipe 10 of the upper scaffolding building frame a tends to come out of the pin body 1 due to an external force such as wind force, vibration, etc., the engaging surface 5 is loaded with the force. Since the engaging surface 5 of the engaging projection 2 which is directly biased by the spring 3 to project the retaining force to prevent this, the vertical pipe 10 can be reliably locked to the pin body 1. it can.

Further, according to the embodiment of the present invention, the engaging projection 2
Since the guide protrusion 6 integrated with the pin is always engaged with the pin body 1 to prevent the lateral displacement of the engaging protrusion 2, the engaging action on the engaging surface 5 is prevented. Since the engaging projection 2 and the guide projection 6 can be reliably maintained and are formed on the metal integral structure 12 which is a rigid body via the connecting rod portion 7, a more stable retaining force can be obtained. Can be maintained.

In the embodiment of the present invention, the upper scaffolding frame a
When removing from the lower scaffold building frame b, the removing work can be performed very easily. That is, as shown in FIG. 7, the sliding surface 4 is formed with the engaging stepped portion 8 as described above, and the engaging projection 2 is resisted against the biasing force of the leaf spring 3 by the tip of the operator, for example. When pressed slightly upward as shown by the arrow and in the retreating direction, the engaging projection 2 retreats into the pin body 1 with the contact point 22 of the guide projection 6 on the pin body 1 as a fulcrum, and the retreat thereof. The engaging step portion 8 engages with the inner peripheral surface 23 of the pin body 1 on the way of entry, and even if the pressing force on the engaging protrusion 2 is released thereafter, the engaging protrusion 2 engages with the engaging step portion 8. Will be maintained in the retracted position. Even when the engagement step portion 8 of the engagement protrusion 2 is engaged with the inner peripheral surface 23 of the pin body 1 to maintain the engagement protrusion 2 at the retracted position, the tip portion thereof, that is, the engagement protrusion. The tip end of the sliding surface 4 of 2 is projected from the side surface of the pin body 1.

In this way, the upper vertical pipe 10 has its engaging hole 11 released from the engagement of the engaging projection 2, so that the pipe 10 can be pulled out from the pin body 1.

When the engagement projection 2 is maintained in the state of retracting into the pin body 1 by the action of the engagement step portion 8, the tip of the engagement projection 2 also protrudes to the outer surface of the pin body 1. According to the embodiment of the present invention, even if the tip of the engaging projection 2 projects from the outer surface of the pin body 1, it is continuous with the engaging surface 5 of the engaging projection 2. Since the sub-sliding surface 9 which is an upward inclined surface is provided, when the vertical pipe 10 is pulled out from the pin upper portion 1b of the pin body 1, the sub-sliding surface 9 is engaged with the engaging hole 11 of the vertical pipe 10 during the pulling-out process. The inner edge of the pin abuts, whereby the engaging projection 2 receives a load that resists the biasing force of the leaf spring 3 and causes it to retract into the inside of the pin main body 1.
Will retreat into the pin body 1 and the lower end of the vertical pipe 10 will allow the pin body 1 to be pulled out from the pin upper portion 1b.

When the upper scaffolding frame a is connected to the pin body 1 attached to the lower scaffolding frame b again,
Since the engaging projection 2 of the pin body 1 is maintained at the retracted position into the pin body 1 as described above, it is sufficient to simply insert the upper vertical pipe 10 into the pin upper portion 1b of the pin body 1. As described above.

In addition, the lower end of the scaffolding frame a pushes the tip of the engagement projection 2 slightly protruding from the pin body 1 in the middle of the insertion thereof, which causes the engagement step of the engagement projection 2. Since 8 is disengaged from the inner peripheral surface 23 of the pin body 1 and released from its retracted position, the engaging projection 2 is fixed to the pin body 1.
Of the scaffolding building frame a, the engaging projections 2 are automatically engaged with the engaging holes 11 of the scaffolding building frame a.

Therefore, the operator's operation on the engaging projection 2 is only the retreat operation when pulling out the scaffolding frame a, and the engaging operation of the engaging projection 2 when inserting the scaffolding frame a into the pin body 1. That is, there is no need to perform any operation for projecting this, and the scaffolding frame a can be automatically locked just by inserting it into the pin body 1.

Thus, the assembling work and the disassembling work of the upper and lower scaffold building frames a and b can be easily performed by one operator.

FIG. 8 shows another embodiment of the present invention. In the above embodiment, the central portion of the pin body 1 is thicker than the upper and lower portions 1b and 1c of the pin 1a. The end portions of the upper and lower vertical pipes 10 come into contact with the step portions 1d and 1e formed on the central portion 1a as shown in this embodiment. The step portions may not be formed to have the same thickness as the pin upper and lower portions 1b and 1c, and the ends q of the upper and lower vertical pipes 10 may directly abut each other. That is, in the present invention, the guide protrusion 6 only needs to be thick enough to contact the guide hole 20 in the pin body 1, and the guide protrusion 6 does not protrude from the pin body 1. Even if the respective end portions directly contact each other, the guide protrusion 6 does not become an obstacle. Therefore, as in the above embodiment, the thick portion 1 is formed in the central portion.
Even in the pin body 1 formed in a, it is not necessary to provide the guide hole 20 at the position where the guide protrusion 6 corresponds to the thick portion 1a as in the above embodiment, that is, this thick portion, and the pin body 1
The guide hole 2 at the position of the upper pin 1b or the lower pin 1c of the
0 may be provided and the guide protrusion 6 may be engaged with it.

As can be seen by referring to FIG. 1, the pin body 1
Since the claws 15a of the scaffolding plate 15 are close to the side of the thick portion a at the center of the pin, if the guide protrusions 6 project from the outer surface of the pin body 1, the guide protrusions 6 abut on the claws 15a. There is a risk that this will retract into the pin body 1 and the engaging projection 2 will also retract due to this, but in the present invention, the guide projection 6 does not project from the pin body 1, so there is a risk of this. Absent. However, the tip of the guide protrusion 6 may protrude from the pin body 1 to the extent that the contact of the claw 15a is not hindered.

In particular, as in the embodiment shown in FIG. 8, the pin body 1
When the guide protrusion 6 is positioned on the pin upper portion 1b or the pin lower portion 1c of the pin, the guide protrusion 6 is used as the claw 1 of the scaffolding plate 15.
The tip portion of the guide protrusion 6 may considerably protrude from the pin body 1 since there is little risk of contact with the pin 5a.

FIG. 9 shows another embodiment of the present invention. In the embodiment, the guide protrusion 6 is formed below the engaging protrusion 2. This is not always necessary, and as shown in FIG. 9, the guide protrusion 6 is located on the upper side of the engaging protrusion 2 via the connecting rod portion 7, and the guide hole 20 is formed in the pin body 1 at this position. Good.

The scaffolding frames a and b described above are
As described at the beginning, the case of applying to the connection of the substantially gate-shaped scaffolding construction frame composed of the vertical pipe 10 and the horizontal pipe 13 has been described, but the present invention is not limited to this, and the connection of a scaffolding construction frame made of a so-called single pipe is described. Of course, it can also be applied to.

FIG. 10 shows an embodiment in which upper and lower scaffolding building frames a and b mainly composed of a single pipe 24 are connected using a pair of engaging projections 2 and 2. This embodiment is shown in FIG. , A pair of engaging protrusions 2 and 2 are provided on the pin body 1 in mutually opposite directions, and in order to pull out the pin body 1 from the upper and lower scaffold building frames a and b from the state shown in the drawing, Engagement protrusion 2
It is clear from the above description that the above can be pressed with a slight downward bias, and the upper engagement protrusion 2 can be pressed with a slight upward bias.

[0041]

According to the first aspect of the present invention, the upper and lower scaffold building frames are automatically connected only by inserting the lower end of the upper scaffold building frame into the connecting pin of the lower scaffold building frame. Therefore, the connection work is further simplified, and the scaffolding frame can be assembled efficiently with a minimum number of workers.

Further, according to claim 1 of the present invention, when the lower end of the upper scaffolding frame is pulled out from the connecting pin of the lower scaffolding frame, the operator engages the engaging projection at the tip of the foot. Since both scaffolding frames can be disassembled by simply pressing, the disassembling work is extremely easy, and the scaffolding frame can be disassembled efficiently with a minimum number of workers.

According to the first aspect of the present invention, since the engaging projection is directly operated to engage and disengage from the scaffold building frame, the engaging projection can be accurately engaged and released with respect to the scaffold building frame. It can be done reliably.

According to the first aspect of the present invention, the engaging projection can be maintained in the retracted state inside the pin main body only by directly pressing the engaging projection inward of the pin main body.
The upper scaffolding frame can be easily disassembled from the lower scaffolding frame, and the engaging projections can be directly operated to keep the engaging step of the engaging projections retracted into the pin body. Therefore, the engagement protrusion can be reliably released.

According to the first aspect, when the scaffolding building frame is inserted into the pin body in the retracted state of the engaging projection, the lower end of the scaffolding building frame is inserted from the pin body of the engaging projection during the insertion. The slightly protruding tip is pressed downward, which causes the engagement step of the engagement projection to disengage from the inner peripheral surface of the pin body and to be released from its retracted position. The engaging protrusions project from the side surface of the main body and automatically engage with the engaging holes of the scaffolding building frame while the scaffolding building frame is being inserted.

Therefore, the operation of the engaging projection by the operator is only the retreat operation when pulling out the scaffolding frame, and the engaging operation of the engaging projection when the scaffolding frame is inserted into the pin body, that is, the projecting thereof. Assembling the scaffolding frame is unnecessary because there is no need to perform any operation, and it will be automatically locked simply by inserting the scaffolding frame into the pin body. In the cycle of disassembly work, only one operation of the connecting pin is required, and these on-site works can be performed remarkably quickly and easily.

According to the second aspect of the present invention, the operation of the engagement projection can be accurately maintained, and the guide projection that accurately maintains the engagement projection is almost projected from the outer surface of the connecting pin. Since it does not exist, there is no danger of contact with other obstacles and causing malfunction, and thus it can be used safely.

Further, even if the guide protrusion is projected from the connecting pin, it can be provided at a position where it does not hinder the malfunction of the guide protrusion, so that the range of application to various scaffold construction frames can be greatly expanded.

Further, according to the third aspect, since the engaging projection is formed integrally with the guide projection through the connecting rod portion, it exerts an action of strongly receiving the external force from the upper side scaffolding construction frame. , The durability can be significantly improved.

According to the present invention, the engaging projection is biased by the spring to project so that the engaging surface portion of the engaging projection is directly engaged with the pin main body, so that the axial load, and hence the axial load. Since the load in the pull-out direction of the scaffolding construction frame is received, the locking action is surely performed.

According to a fifth aspect of the present invention, the tip of the engaging projection slightly protrudes from the side surface of the pin body when the engaging projection is retracted into the pin body by the action of the engaging step portion. However, since the scaffolding frame can be pulled out from the connecting pin without any trouble, the scaffolding frame can be disassembled smoothly and efficiently from this aspect as well.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a front view of the main part.

FIG. 3 is a vertical sectional front view of the same.

FIG. 4 is a perspective view of the main part.

FIG. 5 is a vertical sectional front view showing an operating state of the main part.

FIG. 6 is a vertical sectional front view showing an operating state of the main part.

FIG. 7 is a vertical sectional front view showing an operating state of the main part.

FIG. 8 is a vertical sectional front view showing the other embodiment.

FIG. 9 is a vertical sectional front view showing still another embodiment of the present invention.

FIG. 10 is a vertical sectional front view showing another embodiment of the present invention.

[Explanation of symbols]

 a, b Scaffolding frame 1 Pin body 1 2 Engagement protrusion 3 Spring 4 Sliding surface 5 Engaging surface 6 Guide protrusion 7 Linking rod portion 8 Engaging step portion 9 Sub-sliding surface 10 Vertical pipe 11 Engaging hole 16 Connecting pin 19 Locking surface 20 Guide hole 24 Single pipe

Claims (5)

(57) [Claims] 1. A hollow pin body (1) having an engaging projection (2) projecting from its side surface and capable of retracting from the side surface into the pin body (1), and the projection (2) protruding from the side surface of the pin body (1). The spring 3 for urging is built-in, and the engaging protrusion 2 has the protrusion 2
Is formed on the way of the sliding surface 4 for loading retraction force inside the pin body 1 against the biasing force of the spring 3.
The engaging projection 2 in the retracted position in the inner direction of the pin body 1.
And an engaging step portion 8 for engaging with the scaffold building frame when the engaging projection 2 projects from the side surface of the pin body 1, and the engaging projection 2 resists the biasing force of the spring 3. And a connecting surface 5 for releasing the engagement with the scaffolding construction frame by pressing and pushing the scaffolding construction frame connecting pin. 2. The engagement projection 2 is integrally formed with a guide projection 6 which is constantly engaged with the pin body 1 and prevents the engagement projection 2 from being displaced in a lateral direction orthogonal to the axial direction. Paragraph 1 connection pin for scaffolding frame 3. The scaffolding construction frame according to claim 2, wherein the guide protrusion 6 is integrally formed with the engaging protrusion 2 via a connecting rod portion 7 extending in the axial direction along the inner wall of the pin body 1. Connecting pin 4. The engagement projection 2 receives the axial load of the engagement projection 2 continuously with the rear end of the sliding surface 4 and is locked to the pin body 1 when the engagement projection 2 is projected. Locking surface part 19
A scaffolding frame connecting pin according to any one of claims 1 to 3, wherein 5. The projection 2 is provided continuously with the tip of the engagement surface 5 of the engagement projection 2 to load the projection 2 against the urging force of the spring 3 into the interior of the pin body 1. A scaffolding frame connecting pin according to any one of claims 1 to 4, wherein a sub-sliding surface 9 is provided.