JP2013249717A - Scaffold support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a wall of a building from being damaged when a scaffold support is fitted to the wall.SOLUTION: A scaffold support comprises a support lever having scaffold member grip means at a rear end and a fixture 81 which is inserted into an insertion hole 39 bored in a wall 31 to move forward and back while disabled to rotate. A bolt 53 is projected at a front end of the support lever, and a nut 61 is threadably engaged with the bolt. The fixture has a female screw 83 at a rear end and also has a support shaft 85 at a front end at right angles to the length direction of the fixture. A rotary arm 87 is supported on the support shaft to be freely opened and closed, and the fixture has an opening part 89 allowing the rotary arm to rotate. A spring 90 energizing the rotary arm in a closing direction is fitted between the fixture and the rotary arm, three support shafts are arranged substantially triangularly at the front end of the fixture, and a base end of the rotary arm is supported on the respective support shafts to allow the three rotary arm to be open substantially radially, the respective rotary arms having plane parts pressed against a vertical plane of a wall.

Description

  The present invention relates to a scaffold support, and for example, relates to a scaffold support for supporting a scaffold disposed in a state of being close to the wall when performing construction such as painting or repairing a wall in a building. Is.

As shown in FIG. 12 to FIG. 15, the present applicant has disclosed in Japanese Patent No. 4851165,
The front end of the support rod 37 is composed of a support rod 37 provided with a scaffold member grasping means 35 for grasping the scaffold member 33 at the rear end and a fixture 41 inserted into an insertion hole 39 formed in the wall 31. Is provided with a bolt 53 projectingly, a nut 61 is screwed into the bolt 53 via a washer 59, and a female screw 63 corresponding to the bolt 53 is formed at the rear end of the fixture 41,
The insertion hole 39 penetrates the wall 31;
The front end of the fixture 41 is provided with a support shaft 65 in a direction perpendicular to the length direction of the fixture 41, and the support shaft 65 is rotated so that a pair of rotating arms 73a and 73b can be opened and closed. The fixture 41 is provided with an opening 69 so as to allow the pivot arms 73a and 73b to pivot,
A spring 75 is attached between the fixture 41 and the rotating arms 73a and 73b to bias the rotating arms 73a and 73b in a closing direction.
A bolt 53 at the front end of the support rod 37 is screwed into the female screw 63 of the fixture 41, and the front end of the bolt 53 is held between the ends of the rotating arms 73 a and 73 b that are held closed by the force of the spring 75. Let
The fixing tool 41 is inserted into the insertion hole 39, and the bolt 53 is rotated by rotating the support rod 37 with the front portion of the fixing tool 41 protruding from the insertion hole 39 to the outside of the wall 31. Thus, the rotating arms 73a and 73b are pushed open and opened against the force of the spring 75, and the support rod 37 is further retracted to press the rotating arms 73a and 73b against the vertical surface of the wall. A scaffold support (hereinafter referred to as “conventional scaffold support (A)”) is provided.

Further, as shown in FIGS. 16 to 18, the above-mentioned Japanese Patent No. 4851165
A supporting rod 1 provided with a scaffolding member gripping means for gripping the scaffolding member at the rear end, and a substantially cylindrical fixture 7 inserted into an insertion hole 5 drilled in the wall 3;
A bolt 9 projects from the front end of the support rod 1, and a nut 13 is screwed into the bolt 9 via a washer 11,
The fixing tool 7 is provided with a detent 14 on the outer periphery and is provided with a central hole 15 penetrating the fixing tool 7, and a female screw 17 corresponding to the bolt 9 is formed at the rear end of the central hole 15. A front portion of the hole 15 is formed into a tapered shape to form a tapered portion 19, and a pressing rod 21 having a front end 21 a formed into a tapered shape is fitted into the central hole 15, and the front portion of the fixture 7 is elongated. There is also disclosed a scaffolding support (hereinafter referred to as “conventional scaffolding support (B)”) in which the front part serves as the expansion part 23 by dividing the front part into four in the vertical direction.

Japanese Patent No. 4851165

  Although the conventional scaffold support (A) is excellent, it has been found that there are the following problems.

(A) The rotating arms 73a and 73b in the conventional scaffold support (A) are cross sections formed by raising both side portions 76a and 76a of a substantially rectangular plate-like body 76 at a substantially right angle, as shown in FIG. Since the substantially U-shaped body is formed so that the edge portions 76b and 76b of the both side portions 76a and 76a face the surface of the wall 31, when the scaffold support is attached to the wall 31 of the building, the both side portions 76a and 76a. The edges 76b and 76b may bite into the wall 31 and damage the wall 31.

(B) Since only one pair (two) of the pivot arms 73a and 73b in the conventional scaffold support tool (A) is used, a large force is applied to each of the pivot arms 73a and 73b to damage the wall 31. The risk of doing so is even greater.

  On the other hand, the conventional scaffold support tool (B) fixes the fixing tool in the insertion hole by pressing the expansion portion of the fixing tool against the inner surface of the insertion hole formed in the wall. Although the insertion hole does not need to penetrate the wall, the conventional scaffold support (B) has the following problems.

(C) Since the fixing tool is fixed in the insertion hole by pressing the extended portion of the fixing tool against the inner surface of the insertion hole formed in the wall, the fixing tool moves backward in the insertion hole. There is a risk. In other words, the scaffold may swing back and forth.

(D) Each time the scaffold swings back and forth, the insertion hole of the soft wall material expands, and there is a risk that the fixture will come out of the insertion hole.

(E) If the extension part of the fixture is too wide, the wall material explodes and the fixing force of the insertion hole is lost.

(F) When the fixture comes out of the insertion hole of the wall or the wall material explodes and the fixing force of the insertion hole is lost, there is a risk that the support rod will fall and the scaffold will collapse.

  The present invention solves the above-mentioned problems in the conventional scaffold supports (A) and (B), and provides a scaffold support that does not cause damage to the walls when the scaffold supports are attached to a building wall. It was something that was made.

  In order to solve the above problems, the present invention provides the following scaffold support.

(1) A support rod provided with a scaffold member gripping means for gripping the scaffold member at the rear end, and a fixture that is inserted into an insertion hole formed in the wall so as to be movable forward and backward and not rotatable. A bolt is projected from the front end of the screw, a nut is screwed onto the bolt via a washer, a female screw corresponding to the bolt is formed at the rear end of the fixture, and the bolt is formed at the front end of the fixture. A support shaft perpendicular to the length direction of the fixture is provided, and a pivot arm is rotatably supported on the support shaft so that the pivot arm can be opened and closed. An opening is provided so as to allow, and a spring that biases the rotating arm in a closing direction is attached between the fixture and the rotating arm,
A bolt at the front end of the support rod is screwed into the female screw of the fixture, and the front end of the bolt is positioned between the ends of the rotating arm held in a closed state by the force of the spring,
The fixing tool is inserted into the insertion hole, and the bolt is rotated forward by rotating the support rod with the front part of the fixing tool protruding outward from the insertion hole. In a scaffolding support that opens and opens the moving arm against the force of the spring, and further retracts the support rod to press the rotating arm against the vertical surface of the wall.
Three support shafts are arranged in a substantially triangular shape at the front end of the fixture, and by supporting the base end of the rotation arm on each support shaft, the three rotation arms are opened substantially radially. None
Furthermore, each of the rotating arms is configured such that the planar portion is pressed against the vertical surface of the wall (Claim 1).

(2) The insertion hole is formed from the outside of the wall to the inside of the wall without penetrating the wall, and the end of the insertion hole in the wall allows the rotation arm to rotate. A large-diameter portion is formed, and each rotating arm is brought into pressure contact with a vertical surface in the large-diameter portion in the wall (Claim 2).

[Invention of Claim 1]
According to the first aspect of the present invention, three support shafts of the rotating arm are arranged in a substantially triangular shape at the front end of the fixture, and the base end of the rotating arm is supported by each support shaft. Since the three rotating arms are opened substantially radially, the three rotating arms are pressed against the vertical surface of the wall. Therefore, the force applied to each rotating arm is small, and the possibility that the rotating arm bites into the wall is small.

  Since each of the rotating arms has a flat portion pressed against the vertical surface of the wall, the possibility that each rotating arm bites into the wall is further reduced. Therefore, there is no possibility that the wall is damaged by the rotating arm.

  Further, since the three rotating arms are pressed against the vertical surface of the wall at substantially equal angular intervals, the scaffold support is fixed to the wall in a more stable state.

[Invention of Claim 2]
The insertion hole is formed from the outside of the wall to the inside of the wall without penetrating the wall, and the end of the insertion hole in the wall is a large-diameter portion that allows the rotation arm to rotate. Therefore, the rotating arm does not protrude from the inner surface of the wall (the side facing the inside of the building) in the large-diameter portion, and each rotating arm is in the wall even though the inner surface of the wall is completely intact. As a result of pressure contact with the vertical surface in the large-diameter portion, all of the above problems (c) (d) (e) (e) etc. in the conventional scaffold support (B) are solved.

FIG. 1 is a side view showing an example of a scaffold support according to the present invention. FIG. 2 is a side view showing a bolt, a fixture, a wall and the like of the scaffold support tool. FIG. 3 is a cross-sectional view showing a state in which the front part of the fixture protrudes from the insertion hole toward the inside of the building in the wall in the scaffold support tool. FIG. 4 is a cross-sectional view showing a state in which the same scaffold support is fixed to the wall. FIG. 5 is a cross-sectional view showing another example of the scaffold support according to the present invention. FIG. 6 is a cross-sectional view showing a state in which another example of the scaffold support according to the present invention is fixed to a wall. FIG. 7 is a front view of a scaffold support according to the present invention. FIG. 8 is a front view showing a reinforcing cover of the fixture. 9 is a cross-sectional view taken along line XI-XI in FIGS. FIG. 10 is another cross-sectional view taken along line XX in FIGS. 4 and 6. FIG. 11 is a cross-sectional view corresponding to FIGS. 9 and 10 in the conventional scaffold support tool (A). FIG. 12 is a side view showing a conventional scaffold support (A). FIG. 13: is another side view which shows the conventional scaffold support tool (A). FIG. 14: is sectional drawing which shows the state which protruded the front part of the fixing tool from the insertion hole in the conventional scaffold support tool (A). FIG. 15: is sectional drawing which shows the state which is tightening the nut in the conventional scaffold support tool (A). FIG. 16: is sectional drawing which shows the volt | bolt and fixing tool in the conventional scaffold support tool (B). FIG. 17 is a cross-sectional view showing a state in which a conventional scaffold support (B) is fixed to a wall. FIG. 18 is a front view of a fixture in a conventional scaffold support (B).

  Hereinafter, although this invention is demonstrated with reference to FIGS. 1-10, about the member, components, part, etc. which are common in the said conventional scaffold support tool (A), the code | symbol in the conventional scaffold support tool (A) The same code is used. In addition, the rotation arm etc. of the fixing tool in FIGS.

  In this application, “front” refers to the direction from the scaffold toward the wall (left direction in the figure), and “rear” refers to the direction opposite to “front” (right direction in the figure). The “outside of the wall” refers to the side of the wall facing the scaffold member.

  The examples shown in FIGS. 1 to 4 and 7 to 10 will be described.

  First, the points that the present invention is in common with the conventional scaffold support (A) will be described.

What is indicated by reference numeral 31 is a wall of the building, and what is indicated by reference numeral 33 is a scaffold member constituting a scaffold disposed in a state of being close to the wall 31.

The scaffold support according to the present invention is inserted into a support rod 37 provided with a scaffold member gripping means 35 for gripping the scaffold member 33 at the rear end and an insertion hole 39 formed in the wall 31 so as to be movable forward and backward and non-rotatably. And a fixing tool 81.

The wall 31 is formed by ALC, siding, mortar, etc., for example.

For example, as shown in FIG. 1, the scaffold member gripping means 35 has a pair of sandwiching pieces 43a and 43b attached to a shaft 45 so as to be openable and closable, and one end of a bolt 47 is pivotally attached to one of the sandwiching pieces 43a. A pair of nuts 49 is screwed onto the bolt 47, the bolt 47 is detachably locked to a concave locking portion 51 formed at the tip of the other holding piece 43b, and a pair of nuts 49 are tightened to tighten a pair. The sandwiching pieces 43 a and 43 b are pressed against the scaffold member 33.

A bolt 53 is projected from the front end of the support rod 37.

In the example shown in FIG. 1, an inner collar 55 is slid into a cylindrical support collar 37, and the inner collar 55 is fixed to a predetermined position with respect to the support collar 37 by a screw 57 that penetrates the support collar 37 inward and outward. I am doing so.

A nut 61 is screwed onto the bolt 53 via a washer 59.

A female screw 83 corresponding to the bolt 53 is formed at the rear end of the fixture 81.

 It is assumed that the fixture 81 has a shape that can move forward and backward in the insertion hole 39 but does not rotate in relation to the insertion hole 39 formed in the wall 31.

In the case shown in FIGS. 1 to 4, the insertion hole 39 penetrates the wall 31 in the front-rear direction.

  The front end of the fixture 81 is provided with a support shaft 85 perpendicular to the length direction of the fixture 81. A pivot arm 87 is rotatably supported on the support shaft 85 so as to be freely opened and closed. The fixture 81 is provided with an opening 89 so as to allow the rotation arm 87 to rotate. A spring 90 that biases the rotating arm 87 in a closing direction is attached between the fixture 81 and the rotating arm 87.

  Next, the difference between the present invention and the conventional scaffold support (A) will be described.

  In the present invention, as shown in FIG. 7, three support shafts 85 are arranged in a substantially triangular shape at the front end of the fixture 81. By supporting the base ends 87a, 87a, 87a of the rotating arms 87, 87, 87 on the respective support shafts 85, 85, 85, the three rotating arms 87, 87, 87 are opened substantially radially. To make. As described above, the angle between the pivot arms 87, 87, 87 opened substantially radially is about 120 degrees. Incidentally, the fixing member 81 is provided with three openings 89, 89, 89 for allowing the rotation arms 87, 87, 87 to rotate.

  What is indicated by reference numeral 92 is a reinforcing member fixed to the front end of the fixture in order to reinforce the fixture 81. It is desirable to fix the reinforcing cover 91 to the front end of the fixture 81. For example, the reinforcing cover 91 is fixed to the reinforcing member 92 by fixing means such as bolts.

  Further, each of the rotating arms 87, 87, 87 is configured such that the planar portions 87 b, 87 b, 87 b are in pressure contact with the vertical surface 31 a of the wall 31.

That is, in the example shown in FIG. 9, the turning arm 87 has a substantially U-shaped cross section formed by raising both side portions 88a, 88a of a substantially rectangular plate-shaped body 88 at a substantially right angle, The back surface portion of the plate-like body 88 is the planar portion 87b.

  In the example shown in FIG. 10, the rotating arm 87 is a flat thick plate, and one surface thereof is the flat portion 87b.

  When using the scaffold support tool in the above example, the bolt 53 at the front end of the support rod 37 is screwed into the female screw 83 of the fixture 81, and the front end of the bolt 53 is held in a closed state by the force of the spring 90. It is located between the tips of the three rotating arms 87, 87, 87. See FIG.

Subsequently, the fixture 81 is inserted into the insertion hole 39 formed in the wall 31, and the front portion of the fixture 81 is protruded outward of the wall 31 from the insertion hole 39. By rotating the support rod 37 in this state, the bolt 53 is rotated and moved forward. When appropriate, the front end of the bolt 53 opens each rotating arm 87 against the force of the spring 90 and opens it. See FIG. In this state, the support rod 37 is moved backward to bring the rotating arms 87, 87, 87 into contact with the vertical surface 31 a of the wall 31.

Further, the nut 61 screwed into the bolt 53 is tightened, and the washer 59 is pressed against the rear surface of the wall 31. See FIG.

As described above, the fixture 81 is fixed to the wall 31. That is, the support rod 37 is fixed to the wall 31. Therefore, the scaffold member 33 is gripped by the scaffold gripping means 35 at the rear end of the support rod 37.

When the bolt 53 is retreated by rotating the bolt 53 with the front portion of the fixture 81 projecting outward from the wall 31 from the insertion hole 39, each rotating arm 87 of the fixture 81 is moved by the spring 90. It closes by force and returns to its original position in the fixture 81. Therefore, by fixing the support rod 37 in the scaffold direction, the fixture 81 screwed to the front end of the bolt 53 can be collected and reused.

Note that the insertion hole drilled in the wall is repaired as appropriate after the construction.

  Then, the example shown in FIGS. 5-10 is demonstrated.

The insertion hole 39 is formed from the outside of the wall 31 to the inside of the wall 31 without penetrating the wall 31, and the end portion of the insertion hole 39 in the wall 31 is rotated by the rotating arm. The large-diameter portion 39a is allowed to move. The insertion hole 39 provided with the large diameter portion 39a is formed by an appropriate drill so that the large diameter portion 39a is substantially cylindrical.

  Further, the respective rotating arms 87, 87, 87 are brought into pressure contact with the vertical surface 31 b in the large diameter portion 39 a in the wall 31.

  Also in this case, as in the case described above, the fixture 81 screwed to the front end of the bolt 53 can be recovered and reused.

31 Wall 31a Vertical surface 31b Vertical surface 33 Scaffolding member 35 Scaffolding member gripping means 37 Support rod 39 Inserting hole 39a Large diameter portion 43a Holding piece 43b Holding piece 45 Shaft 47 Bolt 49 Nut 51 Concave locking portion 53 Bolt 55 Inner collar 57 Screw 59 Washer 61 Nut 73a Rotating arm 73b Rotating arm 76 Plate-like body 76a Side portion 76b Edge portion 81 Fixing tool 83 Female screw 85 Support shaft 87 Rotating arm 87a Base end 87b Planar portion 88 Plate-like body 88a Side portion 89 Opening Part 90 spring 91 reinforcing cover 92 reinforcing member

Claims (2)

A support rod provided with a scaffold member grasping means for grasping the scaffold member at the rear end, and a fixture that is inserted into an insertion hole formed in the wall so as to be movable forward and backward and non-rotatably. Projecting a bolt, a nut is screwed into the bolt via a washer, an internal thread corresponding to the bolt is formed at the rear end of the fixing tool, and the fixing tool is formed at the front end of the fixing tool. A support shaft in a direction perpendicular to the length direction is provided, the support shaft is rotatably supported so that the rotation arm can be opened and closed, and the fixing tool is allowed to rotate. Provided with an opening, and a spring for biasing the rotating arm in a closing direction is attached between the fixture and the rotating arm,
A bolt at the front end of the support rod is screwed into the female screw of the fixture, and the front end of the bolt is positioned between the ends of the rotating arm held in a closed state by the force of the spring,
The fixing tool is inserted into the insertion hole, and the bolt is rotated forward by rotating the support rod with the front part of the fixing tool protruding outward from the insertion hole. In a scaffolding support that opens and opens the moving arm against the force of the spring, and further retracts the support rod to press the rotating arm against the vertical surface of the wall.
Three support shafts are arranged in a substantially triangular shape at the front end of the fixture, and by supporting the base end of the rotation arm on each support shaft, the three rotation arms are opened substantially radially. None
The scaffold support according to claim 1, wherein each of the rotating arms has a flat portion pressed against a vertical surface of the wall.   The insertion hole is formed from the outside of the wall to the inside of the wall without penetrating the wall, and the end portion of the insertion hole in the wall is a large-diameter portion that allows the rotation arm to rotate. 2. The scaffold support according to claim 1, wherein each rotating arm is pressed against a vertical surface in the large-diameter portion in the wall.

Images