JP3443035B2 - Connecting pins for scaffolding frames - 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 scaffolding frames upward, a connecting means for connecting the vertically facing scaffolding frames to each other is required. As this connecting means, connecting pins are provided so as to project from the left and right upper end portions of the lower scaffold building frame, and the left and right upper end portions of the upper scaffold building frame are inserted therein.

However, in the conventional connecting pin, the hollow pin main body is provided with an engaging projection that is biased by the spring and projects outside the pin main body, and the engaging projection is spring-loaded. There is provided a sliding surface that applies a retraction force to the inside of the pin body against the urging force of the pin body, and an engagement step portion that engages the engagement protrusion with the retracted position in the inner direction of the pin body.

In using this connecting pin, by inserting the lower end of the vertical pipe of the upper scaffolding frame into the pin body in which the lower end side is connected to the vertical pipe of the lower scaffolding frame, on the way of insertion, The lower end of the vertical pipe abuts on the sliding surface of the engaging protrusion, and the engaging protrusion retracts into the pin body due to the retraction force applied by the contact force, and the lower end of the vertical pipe is inserted into the pin body. During the insertion, the engaging projection is biased by the spring to engage with the engaging hole at the lower end of the vertical pipe, and in the locked state, the upper and lower scaffold building frames are connected to each other.
When removing the scaffolding frame, the engaging protrusions protruding from the lower end of the vertical pipe of the upper side scaffolding frame are pushed in the direction of withdrawal by the operator's foot or the like, and the engagement is performed during the withdrawal. Since the projection engages with the engagement step and is held in the retracted position, that is, the released 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, in the state where the upper and lower scaffolding building frames are connected, the tip projection portion of the engaging projection projecting outward from the lower end portion of the vertical pipe of the upper side scaffolding building frame. By pressing, the engaging projection is held in the unlocked position, so if an object or a worker's foot hits the tip protrusion of the engaging projection during work, this engaging projection is pushed and the The engaging projection is released while
There was a risk of causing an unexpected situation.

In view of the above problems, the present invention ensures that the engagement projections are not easily released when the scaffolding frames are connected to each other, thus ensuring work safety. The purpose of the present invention is to provide a connecting pin.

[0007]

According to a first aspect of the present invention, there is provided a scaffolding frame connecting pin, wherein a support rod 12 is provided inside a hollow pin body 7 and extends axially along an inner wall of the pin body 7. An engaging projection 9 and a connecting projection 11 which are provided at the upper end and the lower end of the support rod 12 and project to the outside of the pin body 7, respectively.
A spring 13 for urging the projections 9 and 11 so as to project to the outside of the pin body 7 via a support rod 12 is provided, and a lock member 20 that projects an operation piece 19 to the outside is provided on the pin body 7. Between the support rod 12 and the lock rod, which is parallel to the inner wall of the pin body 7, and the non-lock posture in which the upper end of the member is tilted away from the inner wall of the pin body 7 from the lock posture. The operation piece 1 is provided so that the posture can be changed.
9 is caused to tilt the lock member 20 from the locked posture to the non-locked posture, so that the engaging projection 9 is retracted into the pin body 7 against the spring biasing force.

According to a second aspect of the present invention, in the scaffolding frame connecting pin according to the first aspect, the connecting projection 11 at the lower end of the support rod 12 is used.
Is attached to the support rod 12 so that the support rod 12 can slide a little forward and backward in the longitudinal direction thereof.

According to a third aspect of the present invention, in the scaffolding frame connecting pin according to the first or second aspect, the tip end portion of the engagement protrusion 9 has the lock member 20 in the unlocked posture and the engagement protrusion 9 is spring-loaded. Even when retracting against the force, it is in a state of slightly protruding from the outer surface of the pin main body 7, and the tip of the engaging projection 9 is pressed so that the engaging projection 9 further moves into the pin main body 7. When the lock member 20 is retracted, the lock member 20 is released from the pressed state with the support rod 12, and is tilted to the lock posture 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. Each scaffold building 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 scaffolding plate 4 is suspended from the pipe 2 by engaging its claws 4a with the lateral pipe 2. An engaging hole 5 is formed at the lower end of each vertical pipe 1 facing the scaffolding 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 building frames a and b facing each other.

FIG. 2 is an external perspective view of the connecting pin 6. In FIG. 2A, a lock member 20 described later is in a locked posture, and an engagement projection 9 projects outside the pin body 7. FIG. 3B shows a state in which the lock member 20 is in the unlocked posture and the engagement projection 9 is retracted into the pin body 7. 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 vertical cross-sectional views showing the operation when connecting the upper scaffold building frame a to the lower scaffold building frame b by the connecting pin 6 and when removing the upper scaffold building frame a.

As can be seen from these figures, the connecting pin 6
Has a circular tube-shaped pin body 7, and a short tube member 8 is fitted and fixed to an axially central portion of the pin body 7.
And an outer peripheral step portion 8 between the pin upper portion 7a and the pin lower portion 7b.
The vertical pipe 1 of the upper scaffolding building frame a that forms a and 8b and is inserted into the pin upper portion 7a and the vertical pipe 1 of the lower scaffolding building frame b that is inserted into the pin lower portion 7b have their respective end surfaces on the outer circumference. Positioning is performed by abutting on the stepped portions 8a and 8b, and at that position, the engaging projection 5 projecting from the pin body 7 engages with the engaging hole 5 at the lower end of the vertical pipe 1, and the vertical direction of the lower scaffolding building frame b The connecting projection 10 of the pin body 7 is adapted to engage with the connecting hole 10 at the upper end of the pipe 1. Instead of the short pipe member 8, the axial center portion of the pin body 7 may be integrally formed to be thick.

The engaging projection 9 is provided on the upper end of a support rod 12 extending in the axial direction along the inner wall of the pin body 7 so as to extend vertically and laterally. The lower end of the support rod 12 is provided with a connecting projection 11. The connecting projection 11 is attached to the support rod 12 so that it can slide a little forward and backward in the longitudinal direction of the support rod 12, although it is provided to project in the same vertical direction as the engaging projection 9. On the back side of the support rod 12, a central portion in the longitudinal direction of a leaf spring 13, which is arcuate in side view and is slidably contacted with the inner wall surface of the pin body 7, is fixed to the central portion in the longitudinal direction. Due to the biasing force of the leaf spring 13, the engagement protrusion 9 and the coupling protrusion 11 cause the pin hole 14a of the pin upper portion 7a and the pin lower portion 7
Each of the pin holes 14b of b is projected to the outside. Further, a sliding surface 17 that is inclined downward is formed on the upper surface side of the engagement projection 9 and the engagement projection 9 is formed.
A sub-sliding surface 1 which is inclined upward at the lower end of the lower surface of the
8 is formed.

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

Further, the pin body 7 is provided with an operation piece 19 on the outside.
The locking member 20 that protrudes from the support rod 12 is positioned in parallel with the inner wall of the pin body 7 as shown in FIG. The pin body 7 is tilted away from the inner wall of the pin body 7 so as to be capable of changing its posture to an unlocked posture as shown in FIG. 5 (A). By tilting to the non-locked posture, the engaging projection 9 is retracted into the pin body 7 against the biasing force of the leaf spring 13.

The lock member 20 is shown in FIG. 3 and FIG. 6 (B).
As can be seen from the above, the operating piece 19 is integrally projected on the outer surface side of the rectangular body portion 21 fitted in the support rod 12 having a U-shaped cross section through the narrow engaging portion 22, and Part 21
The stepped portion 26 for locking is formed between the upper end projecting portion 21a and the upper end surface of the narrow engagement portion 22, and on the pin body 7 side, as shown in FIG. A substantially T-shaped guide groove 25 including an upper lateral groove 23 into which the operating piece 19 of the lock member 20 can be inserted / removed and a vertical groove 24 into which the narrow engagement portion 22 can be engaged / disengaged is provided. And the pin body 7 are provided. Then, when attaching the lock member 20 to the pin body 7, as shown in FIG. 6B, the body portion 21 of the lock member 20 is engaged with the support rod 12 rather than the longitudinal intermediate portion thereof. Inserted into the pin body 7 in a state of being fitted to a position close to the protrusion 9 side, projecting the operating piece 19 from the laterally elongated groove portion 23 of the T-shaped guide groove 25 to the outside,
By engaging the narrow engagement portion 22 with the longitudinal groove portion 24, the state shown in FIGS. 2A and 3A and 3B is obtained.

2A and 3A and 3B show a state in which the lock member 20 is in the lock posture, and in this lock posture, the narrow engagement portion 22 is T. The vertically elongated groove portion 24 of the character-shaped guide groove 25 is fitted so as to be tiltable,
The operation piece 19 projects substantially horizontally, and the body portion 21 is positioned parallel to the inner wall of the pin body 7. From this locked state, as shown in FIG. 5A, the operation piece 19 is raised upward to tilt the main body portion 21 so that its upper end side is away from the inner wall of the pin main body 7, and the lock member 2
By changing the attitude of 0 to the unlocked attitude, the upper end side of the support rod 12, that is, the engaging projection 9 side tilts against the urging force of the spring 13 about the connecting projection 11 at the lower end, As a result, the engagement projection 9 is retracted toward the inside of the pin body 7 and is in the released state as shown in FIG. 5 (A). At this time, the locking stepped portion 26 of the lock member 20 is locked at the corner between the upper end of the laterally elongated groove portion 23 of the T-shaped guide groove 25 and the inner wall of the pin body 7, and the inner surface side upper end portion of the body portion 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 posture.

Even when the engaging projection 9 is in the released state in which it is retracted against the spring biasing force as described above, the tip portion of the engaging projection 9 is the pin body 7 as shown in FIG. 5 (A). Is slightly protruding from the outer surface of the. Then, by pushing the tip end portion of the engaging protrusion 9 from such a state to further retract the engaging protrusion 9 into the pin body 7, the lock member 20 is released from the pressed state with the support rod 12. As a result, as shown in FIG. 5 (B), it is tilted from its non-locked posture to its locked posture by its own weight.

In using the scaffolding frame connecting pin 6 constructed as described above, first, the connecting protrusion 11 protruding outward from the pin hole 14b resists the biasing force of the leaf spring 13 and the pin body 7 is pushed. In the state of being retracted inward, the pin lower portion 7b of the pin body 7 is inserted into the upper end portion of the vertical pipe 1 of the lower scaffolding building frame b, and the connecting projection 11 is engaged with the connecting hole 10 of the vertical pipe 1. The state is as shown in FIG. Thereby, the pin body 7 is attached to the upper end of the vertical pipe 1 of the lower scaffolding building frame b, and thereafter, it is not necessary to remove it even when the scaffolding building frame is not used. At this time, the lock member 20 is in the locked posture, and the engagement protrusion 9 is held at the lock position protruding outside the pin body 7 by the biasing force of the leaf spring 13.

Next, the vertical pipe 1 of the upper side scaffolding frame a is
Pin upper part 7a of the pin body attached to the lower scaffold building frame b
4A, the lower end of the vertical pipe 1 comes into contact with the sliding surface 17 of the engaging projection 9 during the insertion, and the engaging projection 9 is moved by the retraction force applied by the abutting force. As shown in FIG. 5, the pin body 7 is retracted to the released state. At this time, the lock member 20 is in the lock posture as shown in FIG.

Then, the tip end of the engaging projection 9 is further moved downward in a state of being in contact with the inner surface of the vertical pipe 1 of the upper scaffolding building frame a, and as shown in FIG. When the lower end of the vertical pipe comes into contact with the outer peripheral stepped portion 8a of the pin upper portion 7a, the vertical pipe 1
The engaging projections 9 are located opposite to the engaging holes 5 of
The engagement protrusion 9 projects by the biasing force of the leaf spring 13 and engages with the engagement hole 5 of the vertical pipe 1, whereby the upper side scaffolding frame a and the lower side scaffolding frame b are connected to each other. Become.

When removing the upper side scaffolding frame a from the lower side scaffolding frame b, the operation piece 19 of the lock member 20 in the locked posture as shown in FIG. 4B is shown in FIG. 5A. Thus causing the locking member 20 to tilt from the locked posture to the unlocked posture, the engagement projection 9
Resists the biasing force of the leaf spring 13 and retracts into the pin body 7,
Since it is released, in this state, the vertical pipe 1 of the upper scaffold building frame a may be pulled out from the pin body 7 attached to the vertical pipe 1 of the lower scaffold building frame b.

At this time, as shown in FIG. 5 (A), the tip of the engaging projection 9 slightly projects from the outer surface of the pin body 7. Since the sub-sliding surface 18 that is inclined toward the side is formed, the lower end edge of the engaging hole 5 of the vertical pipe 1 abuts the sub-sliding surface 18 when the vertical pipe 1 is pulled out, so that the engaging protrusion 9 It resists the biasing force of the leaf spring 13 and further retracts into the inside of the pin body 7, so that the vertical pipe 1 can be pulled out without any trouble.

When the engaging projection 9 is further retracted into the pin body 7 as described above, the lock member 20 is released from the pressed state with the support rod 12 and is shown in FIG. 5 (B). As described above, the vehicle tilts from the non-locked posture to the locked posture by its own weight, and automatically returns to the original state (initial state). For this reason, it is not necessary to return to the original state the next time it is used, and never forget to lock it.

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 truly 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, it is possible to operate with a normal structure. The piece 19 may be difficult to pull up and may not be able to 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 while being held in the vertical lateral orientation with respect to the support rod 12. Even in such a case, the operation piece 19 can be easily pulled up and the vertical pipe 1 can be pulled out.

That is, when the vertical pipe 1 is inserted into the pin body 7 in an inclined state, the engaging hole 5 of the vertical pipe 1 bites into the engaging projection 9 and the supporting rod 12 is inserted. Is in a state of being integrated with the pin body 7, the tilting operation of the lock member 20 by the operation piece 19 cannot be performed. However, in the case as described above, the connecting projection 11 is 2 m behind the support rod 12 in the longitudinal direction of the support rod 12.
By being able to slide about m, the connecting projection 11 may slide 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 projection 9. Therefore, the operation piece 19 can be easily pulled up, and the engagement projection 9 can be retracted into the pin body 7 to extract the vertical pipe 1.

Connecting pin 6 for scaffolding frame as described above
According to this, the engagement projection 9 is retracted to the inside of the pin body 7 simply by inserting the vertical pipe 1 of the upper side scaffolding frame a into the pin upper portion 7a of the pin body attached to the lower side scaffolding frame b. After being in the released state, it projects by the biasing force of the leaf spring 13 and engages with the engagement hole 5 of the vertical pipe 1, whereby the upper side scaffolding frame a is automatically connected to the lower side scaffolding frame b. Will be.

When the upper side scaffolding frame a is removed from the lower side scaffolding frame b, the locking member 20 is pressed against the support rod 12 by retracting the engaging projection 9 into the pin body 7. It is released from, and tilts from the non-locked posture to the locked posture by its own weight, and automatically returns to the original state (initial state), so there is no need to return to the original state the next time you use it There is nothing to forget.

When the vertical pipe 1 of the upper scaffolding frame a is pulled out from the pin main 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 pin body. When it is inserted in a state inclined with respect to 7, it may be difficult to pull up the operation piece 19 and it may become impossible to extract it, but the connecting projection 11 is in a vertical horizontal direction with respect to the support rod 12. Support rod 1 while being held by
(2) Since it can be slid slightly back and forth in the longitudinal direction, even in such a case, the operation piece 19 can be pulled up and the vertical pipe 1 can be easily pulled out.

[0030]

According to the scaffolding frame connecting pin of the invention of claim 1, if the locking member is set in the locked posture by the operation piece, the engaging protrusion can be held in a locked state protruding to the outside of the pin body. Even if an object or a worker's foot hits the tip projection of the engaging projection while the connecting pin is in use, the engaging projection does not become in the released state, and the safety of work can be secured. 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 retracts to the inside of the pin body and is released, and the spring is released. It is projected by the biasing force of and engages with the engagement hole of the vertical pipe, whereby the upper side scaffolding frame can be automatically connected to the lower side scaffolding frame.

According to a 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 slidable in the longitudinal direction of the supporting rod so that the vertical pipe of the upper side scaffolding frame is lowered. When pulling out from the pin body attached to the vertical pipe of the side scaffolding frame, even if the vertical pipe of the upper side scaffolding frame is inserted in a state inclined with respect to the pin body, it is possible to raise the operation piece. As a result, the vertical pipe can be easily pulled out.

According to the third aspect of the present invention, the tip portion of the engaging projection is provided with the pin body of the pin body even when the locking member is in the unlocked posture and the engaging projection is retracted against the spring biasing force. When the tip of the engaging projection is pressed and the engaging projection is further retracted into the pin body in a state of slightly protruding from the outer side surface, the lock member is released from the pressed state with the support rod. , The lock member is tilted to the lock posture by its own weight, and therefore, when the upper side scaffolding frame is removed from the lower side scaffolding frame, the locking member is supported by retracting the engaging projection into the pin body. It is released from the pressing state with and is tilted from the non-locked posture to the locked posture by its own weight, and automatically returns to the original state (initial state), so the next time you use it,
There is no need to restore it to its original state, and you will never forget to lock it.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state before the upper scaffolding frame and the lower scaffolding frame are connected.

2A and 2B are external perspective views showing a connecting pin, FIG. 2A shows a state in which a lock member is in a lock posture, and an engaging protrusion projects to the outside of a pin body; FIG. 2B shows a lock member. Shows a state in which the engaging protrusion is retracted into the pin body in the unlocked posture.

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

FIG. 4A is a vertical cross-sectional view of the connecting pin showing a state in which the vertical pipe of the upper scaffolding frame is being inserted into the pin body, and FIG. 4B is a state in which the vertical pipe is completely inserted into the pin body. FIG. 6 is a vertical sectional view of a connecting pin showing

FIG. 5 (A) is a vertical cross-sectional view showing a state in which the lock member is tilted from the locked position to the unlocked position when the vertical pipe of the upper scaffolding building frame is pulled out from the pin body;
FIG. 6 is a vertical cross-sectional view showing a state in which the lock member returns to the original state when the vertical pipe is pulled out from the pin body.

FIG. 6A is a perspective view showing a part of the pin body, showing a T-shaped guide groove, and FIG. 6B is an engaging projection and a connecting projection projecting from both ends of the supporting rod. FIG. 6 is a perspective view showing a lock member that engages with a support rod.

FIG. 7A is a front view of a support rod, and engagement protrusions, connection protrusions, and leaf springs attached to the support rod as seen 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 holes 6 connecting pins 7-pin body 9 Engagement protrusion 11 Connecting projection 12 Support rod 13 leaf spring 17 sliding surface 18 Secondary sliding surface 19 Operation piece 20 Lock member

Claims (3)

(57) [Claims] 1. A support rod extending axially along the inner wall of the pin body inside the hollow pin body, and engagements provided at the upper and lower ends of the support rod and projecting to the outside of the pin body, respectively. Provided with a protrusion and a connecting protrusion, and a spring for urging the protrusions so as to protrude to the outside of the pin body through a support rod, and the pin body supports a lock member protruding the operation piece to the outside. Provided so that the posture can be changed between the rod and the rod, which is parallel to the inner wall of the pin body, and in a non-locked posture in which the upper end of the member tilts away from the inner wall of the pin body from the lock posture. A scaffolding frame connecting pin in which the engaging projection is retracted into the pin body against the spring biasing force by inclining the lock member from the locked posture to the unlocked posture by inducing the operation piece. 2. The scaffolding frame connecting pin according to claim 1, wherein the connecting projection at the lower end portion of the supporting rod is attached to the supporting rod so as to be able to slide slightly forward and backward in the longitudinal direction thereof. 3. The tip of the engaging projection is in a state of slightly protruding from the outer surface of the pin body even when the locking member is in the unlocked posture and the engaging projection is retracted against the spring biasing force. When the tip of the engaging projection is pressed and the engaging projection is further retracted into the pin body, the lock member is released from the pressed state with the support rod and locked by its own weight. The scaffolding frame connecting pin according to claim 1 or 2, wherein the scaffolding frame connecting pin is tilted to a posture.