JP2714924B2 - Lock pins for scaffolding members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock pin used to prevent a connecting portion of a scaffold member from being used when the scaffold member is mainly used as a column member.

[0002]

2. Description of the Related Art Connection of a scaffold member such as a strut member is usually performed.
The base of another scaffold member is fitted into the tenon provided at the tip of one scaffold member, and then a separately prepared lock pin is passed through the holes formed on the side surfaces of these tenon and base. This is done by inserting and retaining.

[0003] Therefore, the conventional connection operation requires two operations of fitting the scaffold member and inserting the lock pin, which is complicated. In addition, in order to increase work efficiency in the work of assembling a scaffold, usually, a large number of scaffold members are continuously fitted, and then the work is performed by inserting a lock pin for each connection portion. It is easy to forget to insert the
It is a danger.

As a solution to this inconvenience, the inventor of the present application has provided a pin member at the tip of a substantially U-shaped leaf spring body, and provided a lock pin having an upper slope and a lateral slope at the tip of the pin member. It was proposed (Japanese Utility Model Application No. 4-54773). this is,
When the pin member is provided in the tenon and the pin member is projected from the hole, and the scaffold member is fitted into the tenon, the pin member retracts once due to the upper slope, and then protrudes to perform a retaining function to twist the scaffold member. The pin member can be retracted and pulled out by the lateral slope.

[0005] The above-mentioned lock pin improves the working efficiency, but when a large output force is applied to the scaffold member, the pin member retreats and comes off. This occurs as follows. When a large extraction force is applied to the scaffold member, an upward force acts on the lower end of the tip of the pin member, and a downward force acts on the upper end of the root. A relatively large gap is provided between the pin member and the hole so that the pin member can smoothly project and retreat. For this reason, the pin member is inclined so that the tip is upward, and the lower end of the pin member is inclined. Due to this slope, the lower end of the hole of the scaffold member retreats the pin member, and the scaffold member comes off.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the above-mentioned lock pin so that it can withstand a larger extraction force and hardly occurs.

[0007]

According to the present invention, there is provided a leaf spring body which is substantially U-shaped and has a property of expanding both ends thereof, and a tenon portion of a scaffold member provided on the outer surface of the tip end of the leaf spring body. A pin member that penetrates through the hole on the side surface, fits into the hole of the scaffold member that fits into the tenon, and acts as a stopper, and is formed at the top of the tip of the pin member, and fits the scaffold member into the tenon. An upper slope for retreating the pin member, a lateral slope formed on a lateral end portion of the pin member and retracting the pin member when the scaffold member fitted to the tenon is twisted, and an upper upper end of the upper slope of the pin member. An upper engaging portion which is formed on the portion and which engages with the upper end portion of the outer surface of the tenon when the force for extracting the scaffold member is applied, and which prevents the pin portion from tilting; When the force to pull out the scaffold member is applied to the Engage the inner surface of the lower end, a locking pin of the scaffold member characterized by having a lower engagement portion to prevent the pin portion is inclined.

[0008]

According to the lock pin of the present invention, when a pulling force is applied to the scaffold member, the upper engaging portion of the pin member engages with the upper end of the outer surface of the tenon portion, and the lower engaging portion engages with the lower end of the inner surface. However, the pin member is prevented from tilting so that its tip is directed upward.
For this reason, even if a large extraction output is applied, it becomes difficult to remove.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be specifically described.

The lock pin 10 comprises a leaf spring body 11 provided with pin members 12 and 12.

The lock pin 10 is provided in a tenon portion 14 at the upper end of the scaffold member 13, and when another scaffold member 15 is fitted to the tenon portion 14, the holes 16, 16 of the tenon portion 14 are provided.
Using the holes 17 and 17 of the scaffold member 15, a function of retaining is provided.

The leaf spring body 11 is formed by forming a metal plate material into a substantially U-shape, and both ends have elasticity to expand outward.

The pin members 12, 12 are made of a metal casting or the like, and are caulked on the outer surface of the distal end of the leaf spring body 11, respectively. The base portion 18 of the pin member 12 is
The tip 19 projects from the hole 16 and is sized and shaped to fit into the hole 17 of the scaffolding member 15. Further, the hole is formed so that the pin member 12 can easily enter and exit the holes 16, 17. An appropriate gap is provided between the gaps 16 and 17.

The upper slope 20 is provided at the tip 19 of the pin member 12.
Is obliquely removed. Side slope 21
Has a shape obtained by obliquely removing the tip lateral portion of the tip portion 19 of the pin member 12. In addition, the horizontal oblique image 21 is provided so that both the pin members 12 and 12 are located on the right side of the pin members when viewed from the upper end of the tenon portion 15.

The upper engaging portion 22 is provided on the upper slope 2 of the pin member 12.
0 The upper end protrudes upward from the root 18. The lower engaging portion 23 is formed by adding a portion projecting downward from the back surface to the lower end of the root portion 18 of the pin member 12.

Since the lock pin 10 has the above configuration, it is used as follows.

The lock pin 10 is inserted in advance from the front end of the tenon 14 of the scaffold member 13 and attached to the front end of the tenon 14 as shown in the figure, so that the pin members 12 protrude from the holes 16.

When connecting another scaffolding member 15 to this scaffolding member 13, the root of the other scaffolding member 15 must be
Fit into In this case, the lower end of the scaffold member 15 hits the upper slope 220, and the pin members 12, 12
It is retreated into 6, 16 and is fitted without trouble. When the hole 17 of the scaffolding member 15 overlaps the hole 16 of the tenon portion 14 in this manner, the pin member 12 projects and enters the hole 17 to perform a retaining function.

When separating the two scaffold members 13 and 15,
The scaffold member 15 is slightly rotated counterclockwise with respect to the scaffold member 13. Then, the edge of the hole 17 hits the lateral slope 21, and the pin members 12, 12 are pushed into the mortise hole 16. Therefore, the scaffold member 15 may be pulled out in this state.

When the scaffold member 15 is stopped with the lock pin 10 and a pulling force is applied to the scaffold member 15, the pin member 12 is pulled up as shown in FIG.
Engage with the upper end of the outer surface of the hole 16 of the tenon 14. The lower engaging portion 23 engages with the lower end of the inner surface of the hole 16 of the tenon portion 14. Therefore, even if the ejection force increases, the pin member 12 is prevented from tilting so that the tip is directed upward, and the lower end of the pin member 12 is kept horizontal. Without being retracted, the removal of the scaffold member 15 is stopped.

When the pull-out strength was actually measured using the prototype, the lock pin 10 was found to have a strength of 1.5 to 2.0.
Tons. For comparison, when the lock pin from which the upper and lower engaging portions were removed was similarly measured, the extraction strength was 50 to 200 kg. Since the pull-out strength required for practical use indicated by the Temporary Industrial Association is 1 ton, it can be said that this lock pin 10 has a sufficient pull-out strength.

[0022]

According to the lock pin of the present invention, as described above,
It has an upper engaging part and a lower engaging part.Even when a large output force is applied, the pin member does not tilt and is not retracted, so it effectively acts as a retaining function and has a high extraction strength. can get.

Of course, the lock pin is attached to the scaffold member in advance, and only by fitting the scaffold member into the tenon portion, the locking pin functions as a stopper, and can be separated by slightly twisting and pulling out the scaffold member. By using this lock pin, the conventional lock pin insertion work can be omitted, and the connection work can be made more efficient. Also, forgetting to insert the lock pin is prevented, and safety is improved.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing a use state of the example.

FIG. 3 is an enlarged vertical cross-sectional view of a pin member portion in a usage state of the same example and when output is applied.

FIG. 4 is an enlarged front view of a pin member of the same example.

FIG. 5 is an enlarged bottom view of the pin member portion of the same example.

[Explanation of symbols]

10 ... lock pin, 11 ... leaf spring body, 12 ... pin member,
13 ... scaffold member, 14 ... tenon part, 15 ... scaffold member, 16
... holes in the tenon, 17 ... holes in the scaffold, 18 ... root, 1
9: tip part, 20: upper slope, 21: side slope, 22: upper engaging part, 23: lower engaging part.

Claims (1)

(57) [Claims] 1. A leaf spring body having a substantially U-shape and having a property of expanding both ends thereof, and a leaf spring body provided on an outer surface of a distal end of the leaf spring body and penetrating a hole in a tenon side surface of a scaffold member. A pin member that fits into the hole of the scaffold member that fits into the tenon, and acts as a stopper, and is formed at the top of the tip of the pin member. When the scaffold member is fitted into the tenon, the pin member retracts. A slope, formed on the tip lateral portion of the pin member,
When the scaffold member fitted to the tenon is twisted, a lateral slope for retracting the pin member and an upper slope on the upper end of the pin member are formed at the upper end of the pin member. An upper engaging portion that engages with the upper end portion of the outer surface and prevents the pin portion from tilting, and is formed at the lower end base portion of the pin member, and when a force for extracting the scaffold member is applied, the hole of the tenon portion is formed. A lock pin for a scaffolding member, comprising a lower engaging portion that engages with a lower end portion of an inner surface and prevents the pin portion from tilting.