JPH08177228A - Joint pin for scaffolding jambs - Google Patents

Abstract

PURPOSE: To facilitate joint work by worker himself by inserting vertical pipes of upper side scaffolding jambs in pin main bodies, and connecting the pin main bodies to the vertical pipes of the upper side scaffolding jambs to connect both up and down scaffolding jambs to each other. CONSTITUTION: When the lower end faces of vertical pipes10 are brought into contact with the upper end faces 17a of thick sections 17 of pin main bodies 16, interlocking holes 14 of the vertical pipes 10 are in a state to fit them to upper stage side open holes 22a of the pin main bodies 16, coming in and out energizing force for interlocking projections 21 is released, the projections 21 are interlocked with the interlocking holes 14 of the vertical pipes 10 from the open holes 22a by energizing force of flat springs 24, the pin main bodies 16 are connected to the vertical pipes 10 of upper side scaffolding jambs (a) with the projections 21, and both up and down scaffolding jambs (a) and (b) are connected to each other. By the constitution, the lower ends of the vertical pipes 10 of the upper side scaffolding jambs (a) are inserted in the main body upper parts 16a of the pin main bodies 16 mounted to the vertical pipes 10 of the lower side scaffolding jambs (b) to connect both up and down scaffolding jambs (a) and (b) automatically, and accordingly, joint work can be carried out very simply and easily by worker himself.

Description

Detailed Description of the Invention

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 assembling upwards.

[0002]

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

[0003] Conventionally, as this connecting means, connecting pins are provided at the upper and left upper end portions of the lower scaffolding construction frame, and the lower left and right end portions of the upper scaffolding construction frame are inserted into the connecting pins, and thereafter, approximately between them. A type that locks the arch-shaped lockout arm from the side surface to connect both,
For example, as shown in Japanese Utility Model Laid-Open No. 1-131753, a connecting pin is loosely fitted between upper and lower scaffold building frames, and the connecting pin is rotated by a required angle so that the uneven portions provided on the scaffold building frame and the connecting pin are mutually separated. There has been proposed a type in which the upper and lower scaffold building frames are connected to each other by being engaged with each other.

[0004]

In the prior art as described above, both the upper and lower scaffold building frames are separated from the work of inserting the upper scaffold building frame into the connecting pins of the lower scaffold building frame. It is necessary to lock the left and right lock arms between the two while holding the scaffolding frame, and to rotate the left and right connecting pins between the two. Therefore, at least two workers must perform the connecting work. However, there was a problem that the connection work was troublesome and inefficient.

An object of the present invention is to eliminate this difficulty.

[0006]

A scaffolding frame connecting pin 15 according to claim 1 of the present invention is centered around a fulcrum portion 20 supported by an inner side surface of a hollow pin body 16 such as a tube. It is a rockable lock pin 18, and an engaging projection 21 at one end thereof projects from an upper stage side through hole 22a of the pin main body 16 to engage with the scaffolding building frame a and is retractable into the through hole 22a. And the protruding shaft portion 23 at the other end always projects from the lower side through hole 22b of the pin body 16, and the engaging projection 21 of the lock pin 18 has the upper side through hole 22a.
A spring 24 for urging the locking pin 18 so as to project therefrom, and the locking pin 18 is swung against the spring urging force at the outer end portion of the projecting shaft portion 23 so that the engaging projection 21 is transparent. Hole 22
A release lever 25 for pulling the protruding shaft portion 23 so as to retract into the inside of a is provided.

According to a second aspect of the present invention, in the scaffolding frame connecting pin 15 according to the first aspect, the engaging projection 21 of the lock pin 18 has a downwardly inclined sliding surface 26 formed at the tip thereof. It has been done.

According to a third aspect of the present invention, the release lever 2 is provided in the scaffolding frame connecting pin 15 according to the first or second aspect.
The reference numeral 5 includes a frame piece 30 formed in a U shape by the back plate portion 30a and both side plate portions 30b, 30b, and a handle 31 integrally projecting from one end of the back plate portion 30a. The bottom portion of the pin body 16 of the character-shaped frame piece 30 with the front end surfaces of both side plate portions 30b, 30b abutting the outer surface of the pin body 16 and the handle 31 being positioned directly above the frame piece 30. The protruding shaft portion 23 of the lock pin 18 protruding from the side through hole 22b
By fitting the protruding shaft portion 23 to both side plate portions 30b, 30b.
The protrusion shaft portion 2 is pivotally attached to the protruding shaft portion 2 by a pin 32, and the U-shaped frame piece 30 is rotated downward via the handle 31.
3 is pulled.

According to a fourth aspect of the present invention, in the scaffolding construction frame connecting pin 15 according to any one of the first to third aspects, the lock pin 18 is a metal wire rod having a required diameter cut into a required length. A curved portion 18a is formed at a required portion and its projecting end portion is used as a fulcrum portion 20, and both ends of the metal wire are bent in the same direction as the projecting direction of the curved portion 18a,
An engaging protrusion 21 is formed on one of the bent portions 18b, and a protruding shaft portion 23 is formed on the other bent portion 18c.

[0010]

In the connecting pin 15 according to the first aspect of the present invention, after the lower end portion of the pin body 16 is attached to the upper end portion of the vertical pipe 10 of the lower scaffolding building frame b, the lock pin 18 is engaged. The vertical pipe 10 of the upper scaffolding frame a is inserted into the main body upper portion 16a of the pin body 16 with the protrusion 21 retracted into the upper-side through hole 22a of the pin body 16. During this insertion, the engaging projection 21 is elastically contacted with the inner surface of the vertical pipe 10 by the urging force of the spring 24. Then, when the vertical pipe 10 of the upper side scaffolding frame a reaches the insertion end position into the pin body 16, the engaging projection 21 engages with the engaging hole 14 of the vertical pipe 10 and becomes in the locked state. Engagement protrusion 21
The vertical pipe 1 of the pin body 16 and the upper side scaffolding frame a
0 and 0 are connected, and thereby the upper and lower scaffold building frames a and b are connected to each other.

When removing the upper scaffolding frame a from the lower scaffolding frame b, the release lever 25 is moved to the pin body 16
When the lock pin 18 swings against the spring biasing force by being manually pushed in a direction approaching the outer side surface of the engaging projection 21.
Moves into the through hole 22a and is unlocked. By pulling out the vertical pipe 10 of the upper scaffolding frame a in this state, the upper scaffolding frame a can be easily removed from the lower scaffolding frame b.

In the connecting pin 15 according to claim 2,
By inserting the vertical pipe 10 of the upper scaffold building frame a into the main body upper portion 16a of the pin main body 16, the downward sloped sliding surface of the engaging projection 21 protruding from the upper-stage through hole 22a of the pin main body 16 during the insertion. 26, whereby the engagement protrusion 21 resists the spring biasing force and the pin body 16
The engaging projection 2 receives a load that is pushed toward the inside of the
When the lower end of the vertical pipe 10 reaches the predetermined position of the pin body 16, the engaging projection 21 engages with the engaging hole 14 of the vertical pipe 10. It will be locked. Therefore, the vertical pipe 1 of the upper side scaffolding frame a
Only by inserting 0 into the pin body 16, the upper and lower scaffold building frames a and b are automatically connected.

In the connecting pin 15 according to claim 3,
When removing the upper side scaffolding frame a from the lower side scaffolding frame b, when the handle 31 of the release lever 25 is pulled down, the U-shaped frame piece 30 is in contact with the outer side surface of the pin body 16, both side plate portions 30b, 30b. Of the lock pin 18 is rotated about the lower end portion of the lock pin 18, and accordingly, the protruding shaft portion 23 protruding from the lower-stage through hole 22b of the pin body 16 is pulled outward.
The engaging projection 21 is centered on the fulcrum portion 20 and the upper side through hole 22a is formed.
It swings in the direction of moving in and out. Then, the U-shaped frame piece 3
0 is further rotated so that the lower end surface 30d of the frame piece 30 is brought into contact with and supported by the outer surface of the pin body 16, so that the engaging projection 21 retracts into the upper through hole 22a and unlocks. At the same time, the lock pin 18 is held in its unlocked position. In this unlocked state, the upper scaffolding frame a
The upper side scaffolding building frame a can be easily removed from the lower side scaffolding building frame b by pulling out from the upper body 16a of the pin body 16.

In the connecting pin 15 according to claim 4,
By forming the lock pin 18 by using a metal wire rod by press working or the like, the manufacturing becomes easier and easier than the case of forming the lock pin 18 by a metal plate material or a square material, and the lock pin 1
8, the bending strength of the engaging projections 21 connecting the pin body 16 and the vertical pipe 10 of the upper side scaffolding building frame a can be sufficiently increased, and the safety in use is improved. It can be ensured sufficiently and the service life can be extended.

[0015]

EXAMPLE FIG. 1 shows a state before the scaffold building frame a on the upper side and the scaffold building frame b on the lower side are connected to each other. Each scaffold building frame is composed of a pair of left and right vertical pipes 10, 10, and both vertical pipes. The horizontal pipes 11 and 11 connect the upper ends of the pipes 10 and 10 and the reinforcing bars 12 and 12 mounted over the vertical and horizontal pipes 10 and 11, and the scaffolding plate 13 is attached to the horizontal pipes 11a. It is designed to be suspended by engaging with. The scaffolding plate 13 is provided at the lower end of the vertical pipe 10.
The engaging hole 14 is provided facing the side, and the connecting pin 15 according to the present invention is inserted between the upper and lower vertical pipes 10, 10.

FIG. 2 shows a connecting pin 15 inserted between the upper and lower vertical pipes 10, 10. The connecting pin 15 has a cylindrical pin body 16 that penetrates vertically. The pin main body 16 has a main body upper portion 16a and a main body lower portion 16b formed on both upper and lower sides thereof with a thick portion 17 in the center portion therebetween, and the vertical pipe 1 of the upper side scaffolding frame a is formed on the main body upper portion 16a.
0 is inserted, the lower end surface of the pipe 10 is brought into contact with the upper end surface 17a of the thick portion 17 and positioned, and
The vertical pipe 10 of the lower scaffolding building frame b is inserted into 6b, and the upper end surface of the pipe 10 is the lower end surface 17b of the thick portion 17.
Is abutted against and positioned. Then, the upper and lower vertical pipes 10, 10 are inserted into the upper body 16a and the lower body 16b of the pin body 16 respectively and positioned, and the lock pin 18 constituting a part of the connecting pin 15 according to the present invention. Then, it is more connected to the pin body 16 by the conventionally known connecting projection 19.

As shown in FIG. 2A, the lock pin 18 is built in the circular tubular pin body 16 and is swingable around a fulcrum portion 20 supported by a required portion on the inner surface thereof. , The engaging projection 21 at one end thereof protrudes from the upper stage side through hole 22a formed in the upper body portion 16a of the pin body 16 and engages with the engaging hole 14 of the vertical pipe 10 of the upper side scaffolding building frame a. At the same time, it is freely retractable into the through hole 22a, and the protruding shaft portion 23 at the other end always projects from the lower through hole 22b formed in the thick portion 17 of the pin body 16. Further, the pin body 16 has a built-in leaf spring 24 for urging the lock pin 18 such that the engaging projection 21 thereof projects from the upper through hole 22a. There is provided a release lever 25 for pulling the projecting shaft portion 23 so as to swing the engaging projection 21 into the upper through hole 22a against the urging force of the projecting shaft portion 22a.

The lock pin 18 has a diameter of 9 mm, for example.
The iron wire rod (metal wire rod) is cut into a required length, and by pressing or the like, the curved portion 18 is formed in the intermediate required portion of the iron wire rod.
a is formed and the projecting end portion is used as the fulcrum portion 20, and both ends of the iron wire are bent in the same direction as the projecting direction of the bending portion 18a, and one of the bent portions 18b is engaged with the engaging projection 21. And the other bent portion 18c is used as the protruding shaft portion 23. In this case, since the outer diameter of the engaging protrusion 21 is 9 mm, the engaging protrusion 2
The inner diameters of the upper-stage through hole 22a of the pin body 16 and the engagement hole 14 of the vertical pipe 10 into which 1 can be inserted and engaged are, for example, 10 mm. Further, the inner diameter of the lower through hole 22b is set to the same level. Incidentally, the outer diameter of the pin body 16 is 4
The vertical pipe 10 has an outer diameter of 48.6 mm.

The lock pin 18 can be formed by cutting a metal plate material or pressing a metal square material, but the engaging hole 14 of the vertical pipe 10 is a round hole,
Moreover, since the inner diameter cannot be made too large, in the case of a metal plate material or a square member, the engaging projection 21 portion has a rectangular cross section, and therefore the lock pin 18 is formed by using a metal square material having a square cross section, for example. If so, the inner diameter is 1
The length of one side of the square section of the engaging protrusion 21 that can be engaged with the 0 mm engaging hole 14 is about 6.5 mm. In this case, the geometrical moment of inertia of the engaging projection 21 is about 149 mm ⁴ . On the other hand, when the lock pin 18 is formed by using the iron wire having the diameter of 9 mm as described above, the engaging projection 21 has a circular cross section and the diameter is 9 mm. The second moment of area of the part is about 322 mm ⁴ . Therefore, as is clear by comparing the two, when using a metal wire,
The second moment of area of the engaging projection 21 is much larger than that of the case of using a metal square bar, and sufficient bending strength can be obtained. Further, when the lock pin 18 is formed of a metal wire rod, the lock pin 18 is easier to manufacture than when the lock pin 18 is formed of a metal plate material or a square bar.

As shown in FIG. 2A and other drawings, the engaging projection 21 of the lock pin 18 is formed with a downwardly inclined sliding surface 26 at the tip thereof. Then, the upper side scaffolding frame a on the upper body 16a of the pin body 16
When the vertical pipe 10 is inserted, the lower end of the vertical pipe 10 comes into contact with the sliding surface 26 of the engaging projection 21 protruding from the upper through hole 22a, whereby the engaging projection 21 is urged by the leaf spring 24. Against this, a load that pushes the pin body 16 toward the inside thereof is received, and the pin body 16 retreats into the through hole 22a.

As shown in FIGS. 2A and 2B, the leaf spring 24 is formed in a mountain shape and has a top portion 24a.
Is attached to a side surface portion of the lock pin 18 near the engaging projection 21 with a screw 27, and both end portions 24b, 24b thereof are elastically contacted with the inner side surface of the pin body 16 opposite to the through holes 22a22b. In order to attach the leaf spring 24 to the lock pin 18, the protrusion 2 is attached to the side surface of the lock pin 18 as shown in FIG.
It is also possible to project 8 and provide a recess 29 into which the projection 28 can be fitted, on the top portion 24a of the leaf spring 24, and to fit the recess 29 into the projection 28.

The release lever 25 is made of a metal plate such as a steel plate and has a U-shaped frame piece 30 including a back plate portion 30a and both side plate portions 30b and 30b, and a handle 31 protruding from one end of the back plate portion 30a. 2 is integrally formed, and as shown in FIG. 2 (A), the U-shaped frame piece 30 has a tip end surface of both side plate portions 30b, 30b contacting an outer surface of the pin body 16. Along with the handle 31 positioned right above the U-shaped frame piece 30, the handle 31 is fitted into the protruding shaft portion 23 of the lock pin 18 protruding from the lower-stage side through hole 22b of the pin body 16, and the protruding shaft portion 23 is pivotally attached to both side plate portions 30b, 30b by a pin 32. The U-shaped frame piece 30 has both side plate portions 30.
Rotation guide surfaces 30c are provided at the lower end portions of the front end surfaces of b and 30b. Further, in this case, the pin 32 is connected to the both side plate portions 30.
The distance from the pin 32 to the lower end surfaces 30c of the b and 30b is longer than the distance from the pin 32 to the tip surfaces of the side plate portions 30b and 30b.

When the handle 31 is pulled in the direction of the arrow in FIG. 2 (A), the U-shaped frame piece 30 is in contact with the outer surface of the pin body 16, and the lower ends of the front end surfaces of the side plate portions 30b, 30b. The pin is pivoted around its pivotal guide surface 30c, and along with this, the projecting shaft portion 23 projecting from the lower-stage through hole 22b of the pin body 16 is pulled outward, whereby the lock pin 18 becomes a plate. The engaging projection 21 swings around the fulcrum portion 20 in the direction of retracting into the upper through hole 22a against the biasing force of the spring 24. Then, the U-shaped frame piece 30 is further rotated so that the lower end surface 30d of the frame piece 30 is brought into contact with and supported by the outer surface of the pin body 16, so that the engaging projection 21 is brought into contact with the upper through hole 22a. The lock pin 18 is retained in its unlocked position while retracting inside and being unlocked (see FIG. 4).

The connecting projection 19 for connecting the connecting pin 15 to the lower scaffold building frame b has a well-known structure.
As shown in FIG. 2A, a pair of left and right connecting projections 19 and 19 are attached to both ends of a leaf spring 33 having a substantially U-shaped cross section, and the connecting pin 15 has a main body. The through holes 34, 34 formed at the lower end of the lower portion 16b are constantly projected by the urging force of the leaf spring 33. Therefore, in use, the connecting projections 19, 19 projecting from the through holes 34, 34 are retracted into the connecting pin 15 against the urging force of the leaf spring 33, and the lower side Insert it into the upper end of the vertical pipe 10 of the scaffolding frame b, and connect both projections 19, 19 to the connecting holes 35, 3 of the vertical pipe 10.
5 is engaged. As a result, the connecting pin 15 is attached to the upper end of the vertical pipe 10 of the lower scaffold building frame b, and once attached, it is not necessary to remove it even when it is not used.

Next, the lower scaffolding frame b as described above.
To connect the upper scaffolding frame a to the lower scaffolding frame b via the connecting pin 15 attached to the vertical scaffolding frame of the upper scaffolding frame a as shown in FIG. By inserting 10 into the main body upper portion 16a of the pin main body 16, it abuts on the descending inclined sliding surface 26 of the engaging projection 21 projecting from the upper-stage through hole 22a of the pin main body 16 in the process of insertion, thereby engaging. The protrusion 21 receives a load that pushes it toward the inside of the pin body 16 against the urging force of the leaf spring 24, so that the lock pin 18 swings around the fulcrum portion 20 in the clockwise direction in the drawing. Then, as shown by the phantom line in the figure, the engaging projection 21 retracts into the upper through hole 22a, and at the same time, the protruding shaft portion 23 further projects from the lower through hole 22b. At this time, the release lever 25 is in a state as shown by the phantom line in the figure, for example.

As shown in FIG. 3B, when the lower end surface of the vertical pipe 10 comes into contact with the upper end surface 17a of the thick portion 17 of the pin body 16, the engaging hole of the vertical pipe 10 is formed. 1
4 is brought into a state of matching with the upper side through hole 22a of the pin body 16, whereby the retracting biasing force with respect to the engaging projection 21 is released, and the engaging projection 21 is pushed through the through hole 22a by the biasing force of the leaf spring 24. To the engaging hole 14 of the vertical pipe 10, and the engaging projection 21 connects the pin body 16 to the vertical pipe 10 of the upper scaffolding frame a, whereby the upper and lower scaffolding frames a and b are connected. Will be connected to each other.

As described above, by simply inserting the lower end of the vertical pipe 10 of the upper scaffolding building frame a into the upper body 16a of the pin body 16 attached to the vertical pipe 10 of the lower scaffolding building frame b, both upper and lower scaffolding scaffolds can be inserted. Since the building frames a and b are automatically connected, the connecting work can be performed by one operator extremely easily. Incidentally, the protruding shaft portion 23 of the lock pin 18 is inserted in the middle of inserting the vertical pipe 10 of the upper side scaffold building frame a.
Is further projected from the lower through hole 22b, the release lever 25 has a side plate portion 30b in which the U-shaped frame piece 30 is in contact with the outer surface of the pin body 16 as shown by the phantom line in FIG.
It will rotate clockwise around the upper end of the.

In this embodiment, a downwardly inclined sliding surface 26 is provided at the tip of the engaging projection 21 of the lock pin 18.
As described above, by simply inserting the vertical pipe 10 of the upper scaffolding frame a into the upper body 16a of the pin body 16, the upper and lower scaffolding frames a and b can be automatically connected.
When the sliding surface 26 is not provided at the tip of the engaging projection 21 of the lock pin 18, the worker inserts the vertical pipe 10 of the upper scaffolding building frame a into the upper body 16 a of the pin body 16 by an operator. The tip end portion of the engaging projection 21 protruding from the upper side through hole 22a is pushed to the inside of the pin body 16 against the urging force of the leaf spring 24, and the upper side through hole 22 is manually operated.
It suffices to allow the operator to retreat into the inside of a, and the work in this case can be easily performed by one operator.

On the other hand, when removing the upper scaffolding frame a from the lower scaffolding frame b, as shown in FIG. 4, if the handle 31 of the release lever 25 is pulled in the direction of the arrow in FIG. -Shaped frame piece 30 rotates about the lower end portions of the front end surfaces of both side plate portions 30b, 30b that are in contact with the outer surface of pin body 16, via its rotation guide surface 30c, and accordingly, the lower stage of pin body 16 The projecting shaft portion 23 projecting from the side through hole 22b is pulled outward, whereby the lock pin 18 resists the biasing force of the leaf spring 24 and the engaging projection 21 is centered on the fulcrum portion 20 and the upper projection side. It swings in the direction in which it retreats into the hole 22a. Then, the U-shaped frame piece 30 is further rotated, and the lower end surface 30d of the U-shaped frame piece 30 is moved to the pin body 16 as shown by the phantom line in FIG.
By engaging and supporting the outer side surface, the engaging projection 21 is completely retracted and unlocked in the upper through hole 22a as shown in the phantom line in the figure, and the lock pin 18 is unlocked. Held in position (see FIG. 4). Therefore, the upper side scaffolding frame a may be pulled out from the main body upper portion 16a of the pin main body 16 in the unlocked state in which the engagement projection 21 is retracted into the through hole 22a in this manner. At this time, since the lock pin 18 is held at the lock release position by the release lever 25, the work of pulling out the upper side scaffolding building frame a becomes very easy. After pulling out the upper side scaffolding frame a, if the handle 31 of the release lever 25 is pulled upward from the position shown by the phantom line in FIG. 4 and returned to the position shown by the solid line in FIG. 4, the lock pin 18 is in its original state. That is, the engagement projection 21 can be returned to the locked state in which the engagement projection 21 projects from the upper-stage through hole 22a of the pin body 16.

As described above, when the upper scaffolding frame a is removed from the lower scaffolding frame b, the handle 31 of the release lever 25 is simply pushed by hand in a direction approaching the outer surface of the pin body 16. Since it can be unlocked, the removal work can be performed very easily by one operator.

[0031]

According to the connecting pin of the first aspect of the present invention, the engaging projection of the lock pin built in the pin body attached to the vertical pipe of the lower scaffolding construction frame has the through hole of the upper stage side of the pin body. By inserting the vertical pipe of the upper scaffolding frame into this pin body while retracting inside, the pin body and the vertical pipe of the upper scaffolding frame are connected, and the upper and lower scaffolding frames are connected to each other. Since they can be connected, the connecting work can be easily performed by one worker. Also, when removing the upper side scaffolding frame from the lower side scaffolding frame, the lock is released by simply pushing the release lever by hand in the direction toward the outer surface of the pin body. It can be done easily and easily. Therefore, the work of connecting and removing the scaffolding frame can be efficiently performed.

According to the connecting pin of the second aspect, the upper and lower scaffolding frames can be automatically connected by simply inserting the vertical pipe of the upper side scaffolding frame into the pin body. The connection work with the side scaffolding frame can be performed very easily and easily.

According to the connecting pin of the third aspect, the lock between the pin body and the upper scaffolding construction frame by the engaging projection of the lock pin can be released and held at the unlocked position only by pulling down the handle. Therefore, the releasing operation becomes easy and easy, and the efficiency of the scaffolding frame removal work can be improved.

According to the connecting pin of the fourth aspect, since the lock pin is made of a metal wire rod, the manufacturing is simpler and easier than the case of being made of a metal plate or a square rod.
The mechanical strength of the lock pin, especially the bending strength of the engaging protrusion that connects the pin body and the vertical pipe of the upper scaffolding frame, can be sufficiently increased to ensure sufficient safety in use. , The service life can be extended.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing a use state of a connecting pin according to the present invention.

2A is a vertical cross-sectional side view showing an embodiment of a connecting pin according to the present invention, FIG. 2B is a cross-sectional view taken along line XX of FIG. 2A, and FIG. It is a side view which shows the other example attached to a lock pin.

3A is a vertical cross-sectional side view showing an operating state of a lock pin when the upper scaffolding frame is connected to the lower scaffolding frame, and FIG. 3B is a pin body and an upper side by the lock pin. It is a longitudinal section side view showing the state where the scaffolding construction frame was connected.

FIG. 4 is a vertical cross-sectional side view showing an operating state of the lock pin when the release lever is operated to remove the upper scaffold building frame from the lower scaffold building frame.

[Explanation of symbols]

 a Upper side scaffolding frame b Lower side scaffolding frame 10 Vertical pipe 14 Vertical pipe engaging hole 15 Connecting pin 16 Pin body 18 Lock pin 20 Support point 21 Engagement protrusion 22a Upper stage through hole 22b Lower stage through hole 23 Projection Shaft part 24 Leaf spring (spring) 25 Release lever 26 Sliding surface 30 U-shaped frame piece 30a Back plate part 30b Side plate part 31 Handle 32 pin

Claims (4)

[Claims] 1. A lock pin, which is swingable around a fulcrum portion supported by an inner surface of a hollow pin body such as a tubular body, the engagement protrusion of one end of which is on the upper side of the pin body. A lock pin that protrudes from the through hole, engages with the scaffolding building frame, is retractable into the through hole, and the protruding shaft portion of the other end always protrudes from the lower through hole of the pin body; A spring for urging the engaging projection so as to project from the upper through hole is built in, and the lock pin is rocked against the spring urging force at the outer end portion of the projecting shaft portion. A scaffolding construction frame connecting pin provided with a release lever for pulling the protruding shaft portion so as to retract the fitting protrusion into the through hole. 2. The connecting pin for a scaffolding construction frame according to claim 1, wherein the engaging projection of the lock pin has a downwardly inclined sliding surface formed at the tip thereof. 3. The release lever comprises a frame piece formed in a U shape by a back plate portion and both side plate portions, and a handle integrally projecting from one end of the back plate portion. Of the lock pin protruding from the lower-stage through hole of the pin body in a state in which the front end surfaces of both side plate portions of the frame member are in contact with the outer side surfaces of the pin body and the handle is located right above the frame member. It is fitted to the protruding shaft portion, and the protruding shaft portion is pivotally attached to both side plate portions by pins, and the U-shaped frame piece is rotated downward by the handle so that the lower end surface of the frame piece is outside the pin body. 3. The protruding shaft portion is pulled and held at that position by supporting the side surface in abutment.
Alternatively, the scaffolding frame connecting pin according to 2. 4. The lock pin has a curved portion formed at an intermediate required portion of a metal wire rod cut into a required length so that a projecting end portion thereof serves as a fulcrum portion, and both end portions of the metal wire rod are respectively curved portions. The scaffold construction according to any one of claims 1 to 3, wherein the scaffold is bent in the same direction as the protruding direction of, and the engaging protrusion is formed on one of the bent portions, and the protruding shaft portion is formed on the other bent portion. Frame connection pin.