JP2000328779A - Connecting pin for scaffold vertical frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting pin capable of securing safety in work without easily putting an engaging projection in a release state in a state of mutually connecting scaffold vertical frames. SOLUTION: In this connecting pin for a scaffold vertical frame, a support rod 12 extending along an inner wall of a pin main body 7, an engaging projection 9 and connecting projection 11 being arranged in upper/lower both end parts of the support rod 12 and respectively projecting outside the pin main body 7 and a spring 13 for energizing both projections 9, 11 so as to project outside the pin main body 7 via the support rod 12, are arranged inside the pin main body 7, a lock member 20 for projecting an operation piece 19 is arranged on the pin main body 7 so that an attitude can be changed over a lock attitude and a non-lock attitude so that the engaging projection 9 retreats inside the pin main body 7 against energizing force of the spring 13 by tilting the lock member 20 to the non-lock attitude from the lock attitude by raising up the operation piece 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In order to assemble scaffolding frames sequentially upward at a building site of a building, connecting means for connecting scaffolding frames facing up and down to each other is required. As this connecting means, connecting pins are protruded from the left and right upper ends of the lower scaffold building frame, and the left and right upper ends of the upper scaffold building frame are inserted into the connecting pins.

In the conventional connecting pin, however, an engaging projection which is urged by a spring and protrudes to the outside of the pin body is provided inside the hollow pin body, and this engaging projection is attached to the spring projection. A sliding surface for applying a regression force to the inside of the pin body against the urging force of the pin body, and an engaging step portion for engaging the engaging protrusion with a retreat position in the inward direction of the pin body.

In the use of this connecting pin, the lower end of the vertical pipe of the upper scaffolding frame is inserted into a pin body having its lower end connected to the vertical pipe of the lower scaffolding frame. The lower end of the vertical pipe abuts on the sliding surface of the engagement projection, and the retraction force applied by the abutting force causes the engagement projection to retreat inside the pin main body, and the lower end of the vertical pipe to be inserted into the pin main body. During the insertion, the engaging projections are urged by the springs to engage with the engaging holes at the lower end of the vertical pipe, and become locked, whereby the upper and lower scaffold building frames are connected to each other.
Then, when removing the scaffolding frame, if the engaging projection protruding from the lower end of the vertical pipe of the upper scaffolding frame is pressed in the retreating direction by the operator's toe or the like, the engaging is performed during the retreating. Since the projection is engaged with the engaging step and is held at the retracted position, that is, the release position, the vertical pipe of the upper scaffolding frame can be pulled out from the pin body and the scaffolding frame can be removed.

[0005]

In the above-mentioned conventional connecting pin, when the upper and lower scaffolding frames are connected to each other, the tip projecting portions of the engaging projections projecting outward from the lower end of the vertical pipe of the upper scaffolding frame. By pressing the engaging projection, the engaging projection is held at the unlocked position. Therefore, if an object or the foot of an operator hits the tip projecting portion of the engaging projection during the work, the engaging projection is pushed and the information is transmitted. In the meantime, the engagement projections are released,
There was a risk of an unexpected situation.

The present invention has been made in view of the above-mentioned problems, and it has been found that the engagement projections do not easily become a released state in a state where the scaffolding frames are connected to each other, so that work safety can be ensured. It is an object of the present invention to provide a connecting pin.

[0007]

According to the first aspect of the present invention, there is provided a connecting pin for a scaffolding frame, comprising: a supporting rod 12 extending in an axial direction along an inner wall of a pin body 7 inside a hollow pin body 7; An engagement projection 9 and a connection projection 11 provided at an upper end and a lower end of the support rod 12 and protruding outside the pin body 7, respectively;
A spring 13 is provided to urge the projections 9 and 11 out of the pin body 7 via the support rod 12. A lock member 20 having an operation piece 19 projecting to the outside is provided on the pin body 7. Between the support rod 12 and the lock position parallel to the inner wall of the pin body 7, and a non-lock position in which the upper end of the member is tilted away from the inner wall of the pin body 7 from the lock position. The operation piece 1 is provided so that the posture can be changed.
9, the locking member 20 is tilted from the locked position to the unlocked position, whereby the engaging projection 9 is retracted into the pin main body 7 against the urging force of the spring.

According to a second aspect of the present invention, there is provided the connecting pin for a scaffolding frame according to the first aspect, wherein the connecting projection is provided at a lower end of the support rod.
Is attached to the support rod 12 so as to be able to slide a little in the longitudinal direction.

According to a third aspect of the present invention, in the connecting pin for a scaffolding frame according to the first or second aspect, the distal end portion of the engaging projection 9 has a locking member 20 in a non-locking posture and the engaging projection 9 has a spring. Even when the pin is retracted against the force, the pin is slightly protruded from the outer surface of the pin body 7, and the tip of the engaging projection 9 is pressed, so that the engaging projection 9 is further inserted into the pin body 7. By being retracted, the lock member 20 is released from the state of being pressed against the support rod 12, and is tilted to the lock position by its own weight.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a state before an upper scaffolding frame a and a lower scaffolding frame b are connected to each other. Each scaffolding frame a, b is composed of left and right vertical pipes 1, 1 and a horizontal pipe 2 connecting both pipes 1, 1 and reinforcing bars 3, 3 attached between the vertical and horizontal pipes 1, 2. A scaffold plate 4 is suspended from the pipe 2 by hooking its claws 4 a on the horizontal pipe 2. An engagement hole 5 is formed at the lower end of each vertical pipe 1 so as to face the scaffold plate 4 side.
The connecting pin 6 according to the present invention is inserted between the vertical pipes 1 and 1 of the upper and lower scaffolding frames a and b.

FIG. 2 is a perspective view of the external appearance of the connecting pin 6. FIG. 2A shows a locking member 20, which will be described later, is in a locking position, and an engaging projection 9 projects outside the pin body 7. FIG. (B) shows a state in which the lock member 20 is in the unlocked position and the engagement protrusion 9 is retracted into the pin body 7. FIG. 3A is a front view of the connecting pin 6 in the state shown in FIG. 2A, and FIG. 3B is a longitudinal sectional view thereof. 4 and 5 are longitudinal sectional views showing the operation when the upper scaffolding frame a is connected to the lower scaffolding frame b by the connecting pin 6 and when the upper scaffolding frame a is removed.

As can be seen from these figures, the connecting pins 6
Has a tubular pin body 7, and a short tube member 8 is fitted and fixed to an axial center of the pin body 7,
Outer peripheral step 8 between the upper pin 7a and the lower pin 7b
a, 8b, and the vertical pipe 1 of the upper scaffolding frame a inserted into the pin upper part 7a and the vertical pipe 1 of the lower scaffolding frame b inserted into the pin lower part 7b, each end face having the outer periphery Positioned in contact with the steps 8a and 8b, the engaging projection 9 projecting from the pin body 7 engages with the engaging hole 5 at the lower end of the vertical pipe 1 at that position, and the vertical of the lower scaffolding frame b The connection protrusion 11 of the pin body 7 is engaged with the connection hole 10 at the upper end of the pipe 1. Note that, instead of the short pipe member 8, the central portion in the axial direction of the pin body 7 may be integrally formed with a thick wall.

The engaging projection 9 is vertically and horizontally projected at the upper end of a support rod 12 extending in the axial direction along the inner wall of the pin body 7, and the lower end of the support rod 12 has a connecting projection 11. Although projecting in the same vertical and horizontal direction as the engagement projection 9, the connection projection 11 is attached to the support rod 12 so as to be able to slide a little in the longitudinal direction of the support rod 12. On the back side of the support rod 12, a longitudinal center part of a plate spring 13 having an arcuate shape in a side view, both ends of which are slidably elastically contacted with the inner wall surface of the pin body 7, is fixed to the longitudinal center part thereof. The urging force of the leaf spring 13 causes the engaging projection 9 and the connecting projection 11 to move the pin hole 14a and the pin lower
b project from the pin holes 14b to the outside. A sliding surface 17 that is inclined downward is formed on the upper surface side of the engagement protrusion 9.
Sub-sliding surface 1 that slopes upward at the lower end on the lower side
8 are formed.

As can be seen from FIGS. 3, 6, and 7, the support rod 12 is formed in a substantially U-shaped cross section by a plate-like body 12a and both side walls 12b, 12b.
The engaging projection 9 is fixed to one end (upper end) of the 2a by a mounting shaft 30. The other end (lower end) of the plate-shaped main body 12a has a long hole 3 elongated in the longitudinal direction of the plate-shaped main body 12a.
The mounting shaft 32 of the connecting protrusion 11 is inserted into the elongated hole 31, whereby the connecting protrusion 11 is held in a state in which the connecting protrusion 11 is held in a vertically horizontal position with respect to the supporting rod 12. It can slide about 2 mm back and forth in the direction. The leaf spring 13 is attached to the plate-shaped main body 12a by a caulking material 33.

The pin body 7 has an operation piece 19 externally.
The locking member 20 with the protrusion is positioned between the supporting rod 12 and the locking position parallel to the inner wall of the pin body 7 as shown in FIG. The attitude is provided so as to be changeable over a non-locking posture as shown in FIG. 5A tilted away from the inner wall of the pin main body 7, causing the operation piece 19 to move the locking member 20 from the locking posture. By tilting to the unlocked position, the engagement projection 9 is retracted into the pin body 7 against the urging force of the leaf spring 13.

The lock member 20 is shown in FIGS. 3 and 6B.
As can be seen from the figure, the operation piece 19 is integrally protruded from the outer surface side of the rectangular main body portion 21 fitted into the support rod 12 having the U-shaped cross section via the narrow engaging portion 22 and the main body. Part 21
The locking step 26 is formed between the upper end protruding portion 21a and the upper end surface of the narrow engaging portion 22. As shown in FIG. A substantially T-shaped guide groove 25 comprising an upper horizontally long groove 23 into which the operation piece 19 of the lock member 20 can be inserted and detached and a vertically long groove 24 from which the narrow engagement portion 22 can be disengaged is formed by the short pipe member 8. And the pin body 7. When attaching the lock member 20 to the pin main body 7, the main body 21 of the lock member 20 is engaged with the support rod 12 more than the intermediate portion in the longitudinal direction, as shown in FIG. The operation piece 19 is inserted into the pin main body 7 in a state where the operation piece 19 is fitted to a position close to the projection 9 side, and is protruded outside from the horizontally long groove portion 23 of the T-shaped guide groove 25.
By engaging the narrow engagement portion 22 with the vertically elongated groove portion 24, a state as shown in FIG. 2A and FIGS. 3A and 3B is obtained.

FIGS. 2A, 3A, and 3B show a state in which the lock member 20 is in the locked position. In this locked position, the narrow engagement portion 22 is in the T position. Is engaged with the vertically long groove portion 24 of the V-shaped guide groove 25 so as to be tiltable,
The operation piece 19 projects substantially horizontally, and the main body 21 is located parallel to the inner wall of the pin main body 7. From this locked posture, the operation piece 19 is raised upward as shown in FIG. 5 (A), and the main body 21 is tilted so that the upper end thereof is separated from the inner wall of the pin main body 7, and the lock member 2 is rotated.
By changing the position of the support rod 12 to the unlocked position, the upper end side of the support rod 12, that is, the engagement projection 9 side is tilted about the connection projection 11 at the lower end against the urging force of the spring 13, and As a result, the engagement protrusion 9 retreats to the inside of the pin body 7 as shown in FIG. At this time, the locking step 26 of the lock member 20 is locked at the corner between the upper end of the elongated groove 23 of the T-shaped guide groove 25 and the inner wall of the pin body 7, and the upper end of the inner surface of the main body 21 is The lock member 20 is pressed against the support rod 12, and in this state, the lock member 20 is held in the unlocked position.

As described above, even when the engagement projection 9 is in the released state in which the engagement projection 9 is retracted against the urging force of the spring, the tip end of the engagement projection 9 can be used as shown in FIG. Slightly protruding from the outer side surface. In this state, the locking member 20 is released from the pressed state with the support rod 12 by pressing the distal end of the engagement projection 9 to further retract the engagement projection 9 into the pin body 7. Then, as shown in FIG. 5 (B), the vehicle is tilted from the unlocked position to the locked position by its own weight.

When using the connecting pin 6 for a scaffolding frame constructed as described above, first, the connecting projection 11 protruding to the outside from the pin hole 14b is pressed against the pin body 7 against the urging force of the leaf spring 13. In the state of being retracted inside, the pin lower portion 7b of the pin main body 7 is inserted into the upper end of the vertical pipe 1 of the lower scaffolding frame b, and the connection projection 11 is engaged with the connection hole 10 of the vertical pipe 1. The state is as shown in FIG. As a result, the pin body 7 is attached to the upper end of the vertical pipe 1 of the lower scaffolding frame b, and there is no need to remove it thereafter even when the scaffolding frame is not used. At this time, the lock member 20 is in the lock position, and the engagement protrusion 9 is held at the lock position protruding outside the pin main body 7 by the urging force of the leaf spring 13.

Next, the vertical pipe 1 of the upper scaffolding frame a is
Pin upper part 7a of the pin body attached to lower side scaffolding frame b
4A, the lower end of the vertical pipe 1 abuts on the sliding surface 17 of the engagement projection 9 during the insertion, and the engagement projection 9 is moved by the retreat force applied by the contact force. As shown in (1), the pin is retracted into the inside of the pin body 7 to be in a released state. At this time, the lock member 20 is in the lock posture as shown in FIG.

Then, the distal end of the engaging projection 9 is further moved downward in a state of contact with the inner surface of the vertical pipe 1 of the upper scaffolding frame a, and as shown in FIG. When the lower end of the vertical pipe abuts on the outer peripheral step 8a of the pin upper part 7a, this vertical pipe 1
The engagement protrusion 9 is positioned opposite to the engagement hole 5 of
The engaging projection 9 projects by the urging force of the leaf spring 13 and engages with the engaging hole 5 of the vertical pipe 1, whereby the upper scaffolding frame a and the lower scaffolding frame b are connected to each other. Become.

When removing the upper scaffolding frame a from the lower scaffolding frame b, the operation piece 19 of the lock member 20 in the locked position as shown in FIG. 4B is shown in FIG. 5A. In this manner, the lock member 20 is tilted from the locked position to the non-locked position, so that
Retreats into the pin body 7 against the urging force of the leaf spring 13,
In this state, the vertical pipe 1 of the upper scaffolding frame a may be pulled out from the pin body 7 attached to the vertical pipe 1 of the lower scaffolding frame b.

At this time, as shown in FIG. 5A, the distal end of the engaging projection 9 slightly protrudes from the outer surface of the pin main body 7, but the distal end of the engaging projection 9 on the lower surface side faces upward. Since the sub-sliding surface 18 inclined toward the vertical pipe 1 is formed, the lower end edge of the engaging hole 5 of the vertical pipe 1 comes into contact with the sub-sliding surface 18 when the vertical pipe 1 is withdrawn. Against the urging force of the leaf spring 13, it is further retracted into the pin main body 7, so that there is no hindrance to extracting the vertical pipe 1.

When the engaging projection 9 is further retracted into the pin body 7 as described above, the lock member 20 is released from the state of being pressed against the supporting rod 12, and is shown in FIG. 5B. As described above, the vehicle is tilted from the unlocked position to the locked position by its own weight, and automatically returns to the original state (initial state). Therefore, there is no need to return to the original state at the next use, and there is no forgetting to lock.

When the vertical pipe 1 of the upper scaffolding frame a is pulled out from the pin body 7 attached to the vertical pipe 1 of the lower scaffolding frame b, the vertical pipe 1 of the upper scaffolding frame a is pinned. There is no problem when the vertical pipe 1 is inserted in a state of being parallel to the main body 7, but when the vertical pipe 1 is inserted in a state of being inclined with respect to the pin main body 7, if a normal structure is used, In some cases, the raising operation of the piece 19 becomes difficult, and the piece 19 cannot be pulled out. In such a case, as described above, since the connecting projection 11 can be slid about 2 mm back and forth in the longitudinal direction of the support rod 12 in a state in which the connection projection 11 is held in the vertical and horizontal posture with respect to the support rod 12. Even in such a case, the raising operation of the operation piece 19 can be easily performed, and the vertical pipe 1 can be extracted.

That is, when the vertical pipe 1 is inserted in an inclined state with respect to the pin body 7, the engaging hole 5 of the vertical pipe 1 bites against the engaging projection 9, and the support rod 12 is inserted. Is in a state of being integrated with the pin main body 7, so that the tilting operation of the lock member 20 by the operation piece 19 cannot be performed. However, in the case described above, the connecting projection 11 is positioned 2 m in the longitudinal direction of the supporting rod 12 with respect to the supporting rod 12.
By being slidable by about m, the connecting projection 11 may be slid appropriately back and forth in the longitudinal direction of the support rod 12, and the engaging hole 5 of the vertical pipe 1 may bite into the engaging protrusion 9. Therefore, the raising operation of the operation piece 19 can be easily performed, and the engagement pipe 9 can be retracted into the pin main body 7 to extract the vertical pipe 1.

The connecting pins 6 for scaffolding frames as described above
According to the above, by simply inserting the vertical pipe 1 of the upper scaffolding frame a into the pin upper portion 7a of the pin body attached to the lower scaffolding frame b, the engaging projection 9 retreats to the inside of the pin main body 7. After being released, it is projected by the urging force of the leaf spring 13 and engages with the engagement hole 5 of the vertical pipe 1, whereby the upper scaffolding frame a is automatically connected to the lower scaffolding frame b. Will be.

When the upper scaffolding frame a is detached from the lower scaffolding frame b, the locking member 20 is pressed into contact with the support rod 12 by the retreat of the engaging projection 9 into the pin body 7. From the unlocked position to the locked position due to its own weight, and automatically return to the original state (initial state), so there is no need to return to the original state the next time it is used. Never forget.

When the vertical pipe 1 of the upper scaffolding frame a is removed from the pin body 7 attached to the vertical pipe 1 of the lower scaffolding frame b, the vertical pipe 1 of the upper scaffolding frame a is If the connection projection 11 is inclined with respect to the support rod 7, it may be difficult to raise the operation piece 19 and the removal may not be possible. Support rod 1 held in
(2) Since the slider can be slightly slid back and forth in the longitudinal direction, even in such a case, the operation piece 19 can be raised and the vertical pipe 1 can be easily removed.

[0030]

According to the connecting pin for scaffolding frame of the invention according to the first aspect, if the lock member is in the locked position by the operation piece, the engaging projection can be held in the locked state protruding outside the pin body. Even if an object or an operator's foot hits the projecting end of the engaging projection during use of the connecting pin, the engaging projection is not released, and safety in operation can be ensured. Also, by simply inserting the vertical pipe of the upper scaffolding frame into the upper part of the pin of the pin body attached to the lower scaffolding frame, the engaging projection retreats to the inner side of the pin body and is released, and then the spring is released. And the upper scaffolding frame can be automatically connected to the lower scaffolding frame.

According to the second aspect of the present invention, the connecting pipe at the lower end of the supporting rod is attached to the supporting rod so as to be able to slide slightly in the longitudinal direction of the supporting rod, thereby lowering the vertical pipe of the upper scaffolding frame. When pulling out from the pin body attached to the vertical pipe of the side scaffolding frame, it is possible to raise the operation piece even if the vertical pipe of the upper scaffolding frame is inserted in a state inclined to the pin body As a result, the vertical pipe can be easily extracted.

According to the third aspect of the present invention, even when the locking member is in the unlocked position and the engaging protrusion is retracted against the biasing force of the spring, the tip end of the engaging protrusion can be fixed to the pin body. The locking member is released from the state of being pressed against the support rod by being slightly protruded from the outer side surface, the tip of the engagement protrusion being pressed, and the engagement protrusion being further retracted into the pin body. When the upper scaffolding frame is detached from the lower scaffolding frame, the locking member is retracted into the pin main body so that the locking member is supported by the support rod. Is released from the pushing state, and it tilts from the unlocked position to the locked position due to its own weight, and automatically returns to the original state (initial state).
There is no need to return to the original state, and you will never forget to lock.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state before connection between an upper scaffolding frame and a lower scaffolding frame.

FIGS. 2A and 2B are external perspective views showing a connection pin, in which FIG. 2A shows a state in which a lock member is in a lock position and an engagement protrusion projects outside the pin body, and FIG. Shows a state in which the engagement protrusion is retracted into the pin main body in the unlocked posture.

3A is a front view of a connecting pin in a state shown in FIG. 2A, and FIG. 3B is a longitudinal sectional view thereof.

FIG. 4A is a longitudinal sectional view of a connecting pin showing a state in which a vertical pipe of an upper scaffolding frame is being inserted into a pin body, and FIG. 4B is a state in which the vertical pipe has been completely inserted into the pin body. It is a longitudinal cross-sectional view of the connecting pin shown in FIG.

FIG. 5A is a longitudinal sectional view showing a state in which a lock member is tilted from a lock position to a non-lock position when the vertical pipe of the upper scaffolding frame is pulled out from the pin body;
FIG. 6 is a longitudinal sectional view showing a state where the lock member returns to an original state when the vertical pipe is pulled out from the pin main body.

6A is a perspective view showing a T-shaped guide groove showing a part of a pin body, and FIG. 6B is an engagement projection and a connection projection projected from both ends of a support rod. FIG. 5 is a perspective view showing a lock member engaged with a support rod.

FIG. 7A is a front view of a support rod, and an engaging projection, a connecting projection, and a leaf spring attached thereto, as viewed from the front side of the support rod, and FIG. 7B is a side view thereof.

[Explanation of symbols]

 a Upper scaffolding frame b Lower scaffolding frame 1 Vertical pipe 5 Engagement hole 6 Connection pin 7 Pin body 9 Engagement projection 11 Connection projection 12 Support rod 13 Leaf spring 17 Sliding surface 18 Subsliding surface 19 Operation piece 20 Lock member

Claims (3)

[Claims] 1. A support rod extending in an axial direction along an inner wall of a pin body inside a hollow pin body, and engagements provided at an upper end and a lower end of the support rod and projecting outside the pin body, respectively. A projection and a coupling projection are provided, and a spring is provided for urging the projections to project outside the pin body via a support rod, and the pin body supports a lock member projecting an operation piece to the outside. Between the rod and the lock, the posture can be changed between a locked posture parallel to the inner wall of the pin body and a non-locked posture in which the upper end of the member is tilted away from the inner wall of the pin body from the locked posture. A connecting pin for a scaffolding frame, wherein the operating piece is caused to tilt the lock member from the locked position to the unlocked position so that the engaging projection retreats into the pin main body against the urging force of the spring. 2. The connecting pin for a scaffolding frame according to claim 1, wherein the connecting projection at the lower end of the supporting rod is attached to the supporting rod so as to be able to slide a little in the longitudinal direction. 3. The tip of the engaging projection projects slightly from the outer surface of the pin body even when the locking member is in the unlocked position and the engaging projection is retracted against the urging force of the spring. When the tip of the engaging projection is pressed and the engaging projection is further retracted into the pin body, the locking member is released from the state of being pressed against the supporting rod, and the locking member is locked by its own weight. The connecting pin for a scaffolding frame according to claim 1 or 2, wherein the connecting pin is tilted to a posture.