JP2548893B2 - 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 protrusion 2 having a substantially circular cross-sectional shape that protrudes from the side face and is capable of retracting into the pin body 1 from the side face, and a spring 3 that biases the engaging protrusion 2 to protrude from the side face of the pin body 1. The engaging projection 2 is built in, and the engaging projection 2 is formed on the sliding surface 4 for loading the retraction force inside the pin body 1 against the biasing force of the spring 3. Engagement protrusion 2
Engaging step portion 8 for engaging the retracted position in the inner direction of the pin body 1, and when the engaging protrusion 2 projects from the side surface of the pin body 1, engages with the scaffold building frame and the engaging protrusion 2 Spring 3
The engaging surface 5 that releases the engagement with the scaffolding construction frame by pressing it against the urging force of the spring, and the protrusion 2 is connected to the urging force of the spring 3 continuously with the tip of the engaging surface 5. On the other hand, a configuration is adopted in which the sub-sliding surface 9 for loading the retraction force is provided inside the pin body 1.

According to the second aspect of the present invention, the engaging projection 2 has a substantially horizontal cross-sectional shape which is constantly engaged with the pin body 1 and prevents the engaging projection 2 from being displaced in a lateral direction orthogonal to the axial direction. The configuration according to claim 1 is adopted in which the circular guide protrusion 6 is integrally formed.

According to the third aspect of the present invention, the engaging projection 2 is provided at one end of the connecting rod portion 7 extending axially along the inner wall of the pin body 1 or in the vicinity thereof, and the guide projection 6 is provided at the other end thereof or in the vicinity thereof. The contacting portion 7a of the spring 3 is integrally molded, and the contacting portion 7a of the spring 3 is provided at a position at an appropriate distance from the engaging projection 2 of the connecting rod portion 7.

Further, according to a fourth aspect of the present invention, the shaft of the engaging projection 2 is continuous with the rear end of the sliding surface 4 of the engaging projection 2 and is locked to the pin body 1 when the engaging projection 2 projects. The structure according to any one of claims 1 to 3 is adopted, in which a locking surface portion 19 for receiving a directional load is provided.

[0010]

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 the insertion, and the sliding surface 4 is caused by the abutting force. A force for retracting the engaging projection 2 into the pin body 1 against the urging force of the spring 3 is applied to the engaging projection 2 and the engaging projection 2 retracts into the pin body 1. 10
Allow the lower end of the to be inserted into the lower pin body 1,
Then, the engaging hole 11 on the side surface of the lower end portion of the upper vertical pipe 10
When the engagement protrusion 2 of the lower vertical pipe 10 is inserted into the position where the engagement protrusion 2 of the lower vertical pipe 10 faces, the engagement protrusion 2 is released from the retracting urging force of the upper vertical pipe 10, so that the engagement protrusion 2 moves to the spring 3. It is urged and protrudes to engage with the engagement hole 11, and the inner surface of the engagement hole 11 engages with the engagement surface 5 of the engagement projection 2 so that the upper and lower scaffolding frames a and b are engaged.
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 portion 8 for engaging the engaging projection 2 with the retracted position in the inner direction of the pin body 1 is provided in the middle of the sliding surface 4 of the engaging projection 2. Since it is formed, the engaging projection 2 can be maintained in a state of being retracted into the pin body 1 only by directly pressing the engaging projection 2 inward of the pin body 1, and the upper side The scaffolding frame can be easily disassembled from the lower scaffolding frame.

It should be noted that, 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 building frame a pushes the slightly protruding tip of the engaging projection 2 downward during insertion, which causes the engaging step 8 of the engaging projection 2 to move. Since it disengages from the inner peripheral surface 22 of the pin body 1 and is released from the retracted position, the engaging projection 2 projects from the side surface of the pin body 1, and the engaging projection 2 scaffolds while the scaffolding frame a is being inserted. The engagement hole 11 of the building frame a is automatically engaged.

According to the first aspect of the present invention, the retracting 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. Secondary sliding surface 9
Since the engagement projection 2 is retracted into the pin body 1 by the action of the engagement step portion 8, the tip of the engagement projection 2 slightly protrudes from the side surface of the pin body 1. Also, when the vertical pipe 10 is pulled out from the pin body 1, the engaging projection 2 is retracted into the pin body 1 against the biasing force of the spring 3 by the action of the sub-sliding surface 9. The vertical pipe 10 can be pulled out from the pin body 1 without any trouble.

According to the second aspect of the present invention, the engaging projection 2 is supported by the pin main body 1 by the guide projection 6 so as to prevent the lateral displacement thereof. Therefore, even if the vertical pipe 10 receives a load, The protrusion operation from the side surface of the pin body 1 and the pin body 1
The operation of retreating into the interior can be performed accurately, and the engagement state of the engagement protrusion 2 with the vertical pipe 10 can be maintained well.

According to the third aspect, the engaging projection 2 and the guide projection 6 are integrally formed by the connecting rod portion 7, and the connecting rod portion 7 is formed.
Since the contact portion 7a of the spring is provided at a position lower than the engaging projection 2 by a proper amount and the leaf spring 3 biases this portion, a load for retracting the engaging projection 2 acts. At this time, the guide protrusion 6 does not retract but only the engaging protrusion 2 side retracts, and the entire engaging member 12 can be prevented from retracting, and the retaining action is stable and highly reliable. Can be secured.

According to a fourth aspect of the present invention, the engaging projection 2 is continuously connected to the rear end portion of the sliding surface 4 and is locked to the pin body 1 when the engaging projection 2 is projected, so that the engaging projection 2 extends in the axial direction. Since the engaging surface portion 19 for receiving the 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 main body 1 and its axial direction. Since the load, that is, the load in the pulling-out direction of the scaffolding building frame a is received, the locking action is surely performed.

[0017]

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, and a connecting projection 17 is provided near the upper ends of the lower vertical pipes 10 and 10. A mating connecting hole 18 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 body 1 which entirely penetrates up and down, the pin center portion 1a is formed thick, and outer peripheral step portions 1d and 1e are formed 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 particularly well in FIG. 4, the engaging projection 2 is formed in a generally circular cross-section, and has a sliding surface 4 on the upper surface side of its tip end portion which is a downward inclined surface. The sliding surface 4 has a horizontal engaging surface portion 19 continuous to the rear end portion thereof. Further, an engaging surface 5 parallel to the engaging surface portion 19 is provided on the lower surface side of the engaging projection 2, and a sub-sliding surface 9 which is an inclined surface facing upward is continuously provided at the tip of the engaging surface 5. ing. Further, since the engaging projection 2 has a substantially circular cross-sectional shape, the engaging hole 11 is a circular hole that has been generally used and can be easily processed.

Further, the connecting rod portion 7 is integrally extended downward from the base end portion of the engaging protrusion 2, and is projected from the lower end portion of the connecting rod portion 7 in the same direction as the engaging protrusion 2 to be shorter than the engaging protrusion 2. Guide protrusion 6
Are integrally provided to form a substantially U-shaped engaging member 12. The engagement member 12 is preferably made of white malleable cast iron. A spring attachment projection 7a is formed at a position appropriately spaced from the engagement projection 2 on the back side of the connecting rod portion 7, and the central portion of the substantially arc-shaped leaf spring 3 is caulked or spotted on the spring attachment projection 7a. It is fixed by welding, or it is linked by engaging a small hole provided in the leaf spring 3 with a protrusion provided on the back side thereof. Both ends of the leaf spring 3 are elastically pressed against the inner peripheral surface of the pin body 1 without being fixed. As a result, the engaging protrusion 2 on the engaging member 12
Is urged by the leaf spring 3 to project from the side surface of the pin upper portion 1b of the pin body 1, and the guide protrusion 6 is always engaged with the guide hole 20 of the pin central portion 1a of the pin body 1. Further, since the guide projection 6 has a substantially circular cross-sectional shape, the guide hole 20 is an elliptical shape which has been conventionally used and can be easily processed. In the illustrated example, the connecting rod 7
The entire engaging member 12 including the above is formed into a substantially circular cross section. Further, the guide protrusion 6 is preferably recessed within the thickness of the pin central portion 1a, but as shown in the drawing, the tip end thereof may slightly project from the outer surface of the pin central portion 1a.

An engaging step portion 8 having an important function is provided at an intermediate portion of the sliding surface 4 of the engaging protrusion 2 as described later.

Further, a pair of connecting protrusions 17 on the lower side of the pin 1c of the pin body 1 are provided on the left and right, and both connecting protrusions 17 are fixed or engaged at both ends by a substantially U-shaped leaf spring 21 as described above. And the connection 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 pin upper portion 1b of the pin body 1 until it abuts the step portion 1d. At this time, since the spring mounting projection 7a projecting from the engagement projection 2 at an appropriate distance below is biased by the leaf spring 3, when a load for retracting the engagement projection 2 acts. As shown by phantom lines in FIG. 6, it is possible to prevent the guide protrusion 6 from retracting and only the engaging protrusion 2 side retracting, so that the entire engaging member 12 is retracted. Then, as the lower end of the vertical pipe 10 abuts on the step portion 1d, the engaging projection 2 of the pin body 1 faces the engaging hole 11 on the side surface of the vertical pipe 10 as shown by the solid line in FIG. Since the engaging projection 2 is released from the retracting urging force of the vertical pipe 10, the engaging projection 2 is urged by the leaf spring 3 to project, engage with the engaging hole 11, and engage the engaging surface. 5 contacts the inner edge of the engagement hole 11. Thus, vertical pipe 10
The lower end of the scaffold cannot be pulled out from the pin body 1, and the upper and lower scaffold building frames a and b are connected to each other. That is,
By simply inserting the lower end of the vertical pipe 10 of the upper scaffolding building frame a into the pin body 1 of the lower scaffolding building frame b, the two are automatically connected.

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 is responsible for the retaining force for preventing this, the vertical pipe 10 can be reliably locked to the pin body 1. You 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. It can be maintained reliably.

Further, according to the embodiment of the present invention, the engaging projection 2
The guide rod 6 and the guide protrusion 6 are integrally formed by the connecting rod portion 7. The spring attaching protrusion 7a is provided at a position below the engaging protrusion 2 of the connecting rod portion 7 by an appropriate distance, and the leaf spring 3 urges this portion. Therefore, when a load that causes the engaging protrusion 2 to retract is applied, the guide protrusion 6 does not retract, but only the engaging protrusion 2 side retracts, and the entire engaging member 12 is retracted. It is possible to prevent the water from getting into the sink, the retaining action is stable, and high reliability can be secured.

Further, according to the embodiment of the present invention, when the upper side scaffolding building frame a is detached from the lower side scaffolding building frame b, the detaching 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 in. In this state, the engaging hole 11
The engagement between the lower edge and the engagement surface 5 is released. After that, even if the pressing force on the engagement protrusion 2 is released, the engagement protrusion 2 is maintained at the retracted position by the engagement action of the engagement step portion 8. 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 in 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.

When the upper vertical pipe 10 is pulled out from the pin body 1 from this state, the sub-sliding surface 9 which is an upwardly inclined surface is provided continuously with the engaging surface 5, so that the sub-sliding surface 9 is engaged. The engagement of the lower edge of the hole 11 receives a load so that the engaging projection 2 retracts against the biasing force of the leaf spring 3, and the engaging projection 2 retracts into the pin body 1 to engage. The hole 11 is released from the engagement of the engagement protrusion 2, and the lower end portion of the vertical pipe 10 can be directly extracted from the pin upper portion 1b of the pin body 1.

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 building frame a pushes the tip of the engaging projection 2 slightly protruding from the pin main body 1 in the middle of the insertion, which causes the engaging step 8 of the engaging projection 2. Is disengaged from the inner peripheral surface 23 of the pin main body 1 and released from the retracted position, the engaging projection 2 projects from the side surface of the pin main body 1, and the engaging projection 2 is released while the scaffolding frame a is being inserted. It will automatically engage with the engagement hole 11 of the scaffolding 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 pin central portion 1 of the pin body 1 is shown.
The a is formed to be thicker than the pin upper and lower portions 1b and 1c, and the end portions of the upper and lower vertical pipes 10 are brought into contact with the step portions 1d and 1e formed therein, but this is not always necessary. As shown in this embodiment, the central portion 1a has the same thickness as the upper and lower portions 1b and 1c of the pin, and no step portion is formed. The end portions q of the upper and lower vertical pipes 10 are directly brought into contact with each other. May be. That is, since it suffices for the pin body 1 to have a wall thickness sufficient for the guide protrusion 6 to engage with the guide hole 20, the guide protrusion 6 is prevented from protruding from the pin body 1 in the present embodiment. Even if the respective ends of the pipe 10 come into direct contact with each other, the guide projection 6 does not become an obstacle. Further, as in the above embodiment, the pin central portion 1a
Even if the pin body 1 has a large wall thickness, it is not necessary to provide the guide protrusion 6 and hence the guide hole 20 in the thick pin central portion 1a. The guide hole 6 may be provided and the guide protrusion 6 may be engaged with the guide hole 20.

As can be seen by referring to FIG. 1, the pin body 1
Since the claw 15a of the scaffolding plate 15 is close to the side of the pin central portion 1a of the pin, if the guide projection 6 projects from the outer surface of the pin body 1, the claw 15a abuts the guide projection 6 and pushes it. Although there is a risk of retracting the inside of the main body 1, in the present invention, since the central portion of the leaf spring 3 is connected to the protrusion 7a protruding in the intermediate portion of the connecting rod portion 7, the engaging member 12 engages with the engaging protrusion. There is no possibility that the engagement by the engagement protrusion 2 will be released only by swinging about 2.

The scaffolding frames a and b described so far have been described as being applied to the connection of the substantially gate-shaped scaffolding frame composed of the vertical pipe 10 and the horizontal pipe 13 as described at the beginning. It is needless to say that the present invention can also be applied to the connection of scaffold building frames made of so-called single pipe without limitation.

[0038]

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, when the lower end of the upper scaffolding frame is pulled out from the connecting pin of the lower scaffolding frame, the operator only needs to lightly press the engaging projections on both scaffolds. Since the building frame can also be disassembled, disassembling work is extremely easy, and the scaffolding building frame can be efficiently disassembled with a minimum of workers.

Further, since the engaging projection is directly operated to engage with and disengage from the scaffold building frame, the engaging projection can be engaged and released with respect to the scaffold building frame accurately and reliably.

Further, since the engaging projection has a substantially circular cross section, the engaging hole can be a circular hole and can be easily processed by a general-purpose technique.

According to the first aspect of the present invention, the engaging projection can be maintained in the retracted state in 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.

Further, when the scaffold building frame is inserted into the pin body in the retracted state of the engagement projection 2, the lower end of the scaffold building frame slightly projects from the pin body 1 of the engagement projection during the insertion. The tip of the pin is pushed downward, which causes the engaging step of the engaging protrusion to disengage from the inner peripheral surface of the pin body and be released from its retracted position. The projecting protrusions and the engaging protrusions automatically engage with the engaging holes of the scaffolding frame while the scaffolding frame is being inserted.

Therefore, the operator only operates the engaging projections when the scaffolding frame is pulled out, and when the scaffolding frame is inserted into the pin body, the engaging projections are engaged. 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.

Further, according to claim 1, in the state where the engaging projection is retracted into the inside of the pin body by the action of the engaging step portion, the tip of the engaging projection slightly projects from the side surface of the pin body. However, since the scaffolding frame can be pulled out from the connecting pin without any trouble, the disassembling work of the scaffolding frame can be performed smoothly and efficiently also from this aspect.

According to the second aspect, since the guide projection is provided, the operation of the engagement projection can be accurately maintained. In addition, the guide protrusion that maintains the engaging protrusion accurately
Since it hardly projects from the outer surface of the connecting pin,
There is no risk of malfunction due to contact with other obstacles, and thus it can be used safely.

According to the third aspect of the present invention, the engaging projection and the guide projection are integrally formed at the connecting rod portion, and the lower portion of the connecting rod portion is urged by a spring at an appropriate distance from the engaging projection. Therefore, when a load that causes the engaging protrusion to retract is applied, the guide protrusion does not retract, only the engaging protrusion side retracts, and both the engaging protrusion and the guide protrusion sink. Can be prevented, the retaining action is stable, and high reliability can be secured.

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

[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 engagement member, and FIG. 4 (b) is a front view thereof.

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.

[Explanation of symbols]

 a, b Scaffolding frame 1 Pin body 2 Engagement projection 3 Leaf spring 4 Sliding surface 5 Engaging surface 6 Guide projection 7 Linking part 7a Spring mounting projection 8 Engaging step 9 Secondary sliding surface 10 Vertical pipe 11 Engaging Hole 16 Connection pin 19 Locking surface 20 Guide hole

Claims (4)

(57) [Claims] To 1. A hollow pin body 1, an engaging projection 2 from its side retreat inside of the pin body 1 of the incoming freely cross-sectional shape substantially circular with projecting from its side, the engaging projection 2 pin incorporates a spring 3 projecting urging from the side surface of the main body 1, the engaging projection 2, for loading the regression inputs inside of the pin body 1 against the engagement projections 2 the biasing force of the spring 3 and the sliding surface 4, the
The engaging protrusion 2 is formed on the sliding surface 4 of the pin body 1.
When the engaging projection 8 engages with the retracted position in the inner direction, and the engaging projection 2 projects from the side surface of the pin body 1 , it engages with the scaffolding frame and the engaging projection 2 is provided with the spring 3 . The engagement surface 5 that releases the engagement with the scaffolding construction frame by pressing against the power, and the tip of the engagement surface 5 continuously.
The projection 2 is retracted inside the pin body 1 against the biasing force of the spring 3.
A scaffolding frame connecting pin provided with an auxiliary sliding surface 9 for loading an input . 2. The engagement projection 2 is integrally formed with a guide projection 6 having a substantially circular cross-sectional shape, which is constantly engaged with the pin body 1 and prevents displacement of the engagement projection 2 in a lateral direction orthogonal to the axial direction. The scaffolding frame connecting pin according to claim 1, which is formed. 3. The spring 3 is integrally formed with an engaging projection 2 at one end or in the vicinity thereof and a guide projection 6 at the other end or in the vicinity thereof of a connecting rod portion 7 extending in the axial direction along the inner wall of the pin body 1. coupling pin scaffolding Kenwaku of claim 2, wherein formed by providing a position suitable distance the contact portion 7a from engaging projection 2 in the continuous rod portion 7 of the. 4. A continuously to the rear end portion of the sliding surface 4 of the engagement projection 2, receive the load in the axial direction of the engaging projection 2 engaged with the pin main body 1 when the projecting engagement projections 2 engaging The scaffolding frame connecting pin according to any one of claims 1 to 3, wherein the surface portion 19 is provided.