JP2016044506A - Leg lock device of scaffold base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leg lock device of a scaffold base excellent in easiness-to-use, capable of executing a lock and a lock release of a leg of a scaffold base by simpler operation.SOLUTION: A flap 5 is rockably installed in an end part of a top plate 2. A pin insertion hole 342a is formed on a fixing plate 34 of a connection metal fitting 33 of a leg 3 to the top plate. An end part of a lock pin 7 installed in the flap is inserted into the pin insertion hole. The flap and the lock pin are energized inward in the lateral direction by a compression coil spring 8. A rotary plate 35 of the connection metal fitting is formed with a first locking recessed part 352a for locking-stopping an end part of the lock pin when rotating the leg up to a use position, a second locking recessed part 352b for locking-stopping the end part of the lock pin when rotating the leg up to a storage position and a guide edge part 352c provided between both locking recessed parts and guiding the end part of the lock pin. When rocking the flap outward in the lateral direction, the end part of the lock pin is disconnected from the locking recessed part, and the leg can be rotated.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a scaffolding platform used as a scaffold for work in a construction site or the like, and more specifically, a leg that is foldable at the left and right ends of the top plate of the scaffolding platform is used in a downward-facing position. The present invention also relates to a locking device for locking at each of the storage positions folded on the back side of the top plate.

  As this type of locking device, one disclosed in Patent Document 1 is generally known. This locking device is fixedly attached to both the front and rear sides of the left and right ends of the top plate, and is rotatably attached to the outside of the fixed plate and fixed to the upper ends of the front and rear struts of the legs. A rotating plate that is attached, two front and rear lock pins provided on the back side of the left and right ends of the top plate so as to be movable in the front-rear direction, and a spring that biases each lock pin outward in the front-rear direction The fixed plate is provided with a pin insertion hole, the first plate insertion hole that matches the pin insertion hole when the leg is rotated to the use position, and the leg is in the storage position. A second pin insertion hole is provided that matches the pin insertion hole when the second pin insertion hole is rotated. Each of the front and rear lock pins has a substantially L shape in which an inner end in the front-rear direction is bent in a drooping manner. According to this locking device, either one of the pin insertion holes is matched with the pin insertion hole, and the outer end portion of the lock pin is inserted and inserted into these holes, so that the leg can be used at the use position and the storage position. It is possible to lock. When releasing the locked state of the leg, hold the hanging inner end of the lock pin with your hand and slide it inward in the front-rear direction so that the outer end is one of the pin insertion hole and pin insertion hole. Therefore, the leg may be rotated in the required direction in this state.

  However, in the case of the conventional locking device described above, when the legs are rotated from the use position to the storage position or vice versa, the inner ends of the two front and rear lock pins are simultaneously pulled inward in the front-rear direction. After unlocking, it is necessary to rotate the leg in the required direction, which has a problem in operability.

Utility Model Registration No. 2595978

  SUMMARY OF THE INVENTION An object of the present invention is to provide a scaffolding leg locking device that can be locked and unlocked by a simpler operation and is easy to use.

Scaffolding leg locking device according to the present invention,
The upper ends of the two front and rear struts are attached to the front and rear side portions of the left and right ends of the top plate via connecting brackets, and the connecting brackets are front and rear side portions of the left and right ends of the top plate. The front and rear two fixed plates each fixedly attached to the front and rear, and the front and rear two fixedly attached to the front and rear fixed plates so as to be rotatable around a horizontal axis and fixedly attached to the upper ends of the front and rear columns. A locking device for locking a leg at each of a use position facing downward at the front end and a storage position folded on the back side of the top board,
The upper edge of the flap is attached to the left and right ends of the top plate so that it can swing around the axis extending in the front-rear direction.
Long pin insertion holes in the left and right direction are formed in the front and rear fixed plates,
The lock pin is attached to the flap so that its end can be inserted into the pin insertion hole of the front and rear fixing plate,
The flap and the lock pin are urged inward in the left-right direction by the urging means,
A first locking recess for locking the end of the lock pin when the leg is rotated to the use position at the edge of each of the front and rear rotation plates, and a lock pin when the leg is rotated to the storage position A second locking recess for locking the end, and an arcuate guide edge provided between the first locking recess and the second locking recess for guiding the end of the lock pin; ,
By swinging the flap outward in the left-right direction, the end of the lock pin can be disengaged from the first locking recess or the second locking recess and the leg can be rotated from the use position to the storage position or vice versa. (Claim 1).

In the lock device described above, the end of the lock pin is locked to the first locking recess of the rotating plate, and the lock pin is biased inward in the left-right direction by the biasing means at this position. The leg is locked in the use position with the tip downward. Similarly, the end of the lock pin is engaged with the second locking recess of the rotating plate, and the lock pin is urged inward in the left-right direction by the urging means at this position, so that the leg It is locked in the storage position folded on the back side.
Then, when the flap is swung outward in the left-right direction against the urging force by the urging means from each of the above locked states, the end of the lock pin comes from the first locking recess or the second locking recess. Since it is released and unlocked, the leg can be rotated from the use position to the storage position or vice versa.
Therefore, according to the leg locking device of the scaffolding base according to the present invention, the leg can be locked and unlocked at the use position and the storage position by a very simple operation, and the usability is improved.

  As a preferred embodiment of the scaffolding leg locking device according to the present invention, there is provided a cover wall extending downward from the upper edge portion of each of the left and right end surfaces of the top plate at a distance from the flap. A flap main body having a lock pin holding portion that is swingably disposed in a space between the end surface and the cover wall, and an operation lever extended so as to protrude from the lower edge portion of the flap main body to the space. (Claim 2).

  In the locking device of the above aspect, since the flap is covered with the cover wall when the scaffolding platform is viewed from the front and rear direction, for example, a part of the operator's body or material contacts the flap and locks. There is no risk of the state being released unexpectedly, and the appearance is good. Further, the unlocking operation is excellent in operability because it is only necessary to move the operation lever provided on the flap outward in the left-right direction using, for example, one hand.

  In the above-described scaffolding leg locking device according to the present invention, it is preferable that the biasing means comprises at least one compression coil spring interposed between the facing portions of the cover wall and the flap.

  If a compression coil spring is used as the urging means as described above, there is no risk of breaking at the root portion as in the case of using a tension coil spring, which is excellent in durability and has a simple mounting structure. be able to.

  Moreover, in the leg locking device according to the aspect of the present invention, the left and right end surfaces of the top plate and the cover wall are constituted by end surface / cover wall constituting members made of a shape material, and the flap is made of the shape material. A hinge shaft extending in the front-rear direction is formed at one predetermined position of both the structural members, and is fitted to the other predetermined position so as to be rotatable relative to the hinge shaft. A hinge groove to be matched may be formed (claim 4).

  In the case of the above configuration, since the structure of the lock device is simplified, the manufacture becomes easy. Further, in the case of the above configuration, the swinging movement of the flap is stable, and the biasing force by the biasing means is uniformly applied to the entire flap, and eventually to the lock pin, without requiring detailed setting and adjustment of the biasing means. Since it can be made to act, it does not hinder the operation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, wherein (a) is a plan view showing a scaffolding base with a leg locked in a use position, and (b) is a front view thereof. It is a front view which shows the scaffold base of the state which locked the leg in the accommodation position. It is a perspective view which decomposes | disassembles and shows the locking device of a leg. It is a front view of a locking device in the state where a leg was locked in a use position. It is sectional drawing which follows the VV line of FIG. It is sectional drawing of the locking device in the state which locked the leg in the use position. It is sectional drawing of the locking device in the state which unlocked and rotated the leg.

An embodiment of the present invention will be described below with reference to FIGS.
In the following description, “front” refers to the bottom of FIG. 1A, “back” refers to the top of FIG. 1A, and “left and right” is viewed from the front. The right and left of the case (left and right in FIG. 1A and FIG. 1B) shall be said.

  As shown in FIG. 1, a scaffolding base (1) according to this embodiment includes a top plate (2) made of an extendable scaffolding plate and a pair of foldable attachments attached to the left and right ends of the top plate (2). It is provided with a leg (3).

The telescopic scaffolding plate (2) that constitutes the top plate connects the first scaffolding plate member (20A) and the second scaffolding plate member (20B) extending in the left-right direction so that they can move relative to each other in the length direction. It is made.
Each scaffold plate member (20A) (20B) is of a slat-like shape, extending in the left-right direction and arranged at a predetermined interval in the front-rear direction (21) (21A); (21) (21B) and connecting frame members (22A) (22B) connecting the left and right ends of the main members (21) (21A); (21) (21B).
The interval between adjacent main members (21), (21A), and (21B) is slightly larger than the front-rear width of the main members (21), (21A), and (21B). And between the main members (21) and (21A) of the first scaffold plate member (20A), the main members (21) and (21B) of the second scaffold plate member (20B) are arranged so as to be relatively movable in the left-right direction. In this state, the left and right ends of the main material (21) (21A); (21) (21B) in each scaffold plate member (20A) (20B) are connected by the connecting frame material (22A) (22B). ing.
The main material (21) of the first scaffold plate member (20A) and the second scaffold plate member (20B) is the same as the main material (21A) (21B) located on the front side of the member (20A) (20B). The hollow cross section is formed from a metal hollow shape such as an aluminum alloy having a substantially vertical rectangle.
The main material (21A) located at the front side portion of the first scaffold plate member (20A) includes an upper hollow portion (211), a lower hollow portion (212), and an upper hollow portion (211) each having a transverse rectangular cross section. And a vertical connecting wall portion (213) for connecting the lower surface rear edge of the lower hollow portion (212) and the upper surface rear edge of the lower hollow portion (212), and these portions (211) (212) (213) An open recess (214) is formed (see FIG. 5). This main material (21A) is also formed from a hollow metal material such as an aluminum alloy.
Although not shown in detail, the main material (21B) located in the front side portion of the second scaffold plate member (20B) is composed of an upper hollow portion, a lower hollow portion, and an upper hollow portion each having a transverse rectangular cross section. A vertical connecting wall portion that connects the lower surface front edge and the upper surface front edge of the lower hollow portion, and a recess opened rearward is formed by these portions. The main material is also formed from a metal hollow shape such as an aluminum alloy.
The connecting frame member (22A) positioned at the right end portion of the first scaffold plate member (20A) and the left end portion of the second scaffold plate member (20B) has a horizontal rectangular frame shape when viewed from the left-right direction. The right ends of the main members (21) and (21A) of the first scaffold plate member (20A) and the left ends of the main members (21) and (21B) of the second scaffold plate member (20B) are respectively connected to the connecting frame member ( In the state of being inserted into 22A), it is joined and fixed to the upper and lower walls and front and rear walls of the connecting frame member (22A) by rivets or the like.
The left and right end portions of the telescopic scaffold plate (2), that is, the left end portion of the first scaffold plate member (20A) and the connecting frame member (22B) positioned at the right end portion of the second scaffold plate member (20B) will be described later.
1 and 2 show the telescopic scaffolding plate (2) at the maximum extension. The front side of the main member (21B) located at the front side of the second scaffold plate member (20B) is in contact with the left edge of the front wall portion of the right connection frame member (22A) of the first scaffold plate member (20A). A plate-like stopper (9) for restricting the stretchable scaffolding plate (2) from extending further is attached.

Each leg (3) has a ladder shape with two front and rear columns (31) and a plurality of horizontal steps (32) secured to both columns (31). The upper end portion of the column (31) is foldably attached to the left and right end portions of the top plate (2) by the connecting metal fitting (33).
As shown in Figure 2, when the left and right legs (3) are folded and stored on the back side of the top plate (2), the left leg (3) is up and the right leg (3) is down. Both legs (3) are stacked.

The telescopic scaffolding plate (2) constituting the top plate is provided with a locking device (4) for locking the first scaffolding plate member (20A) and the second scaffolding plate member (20B) at an arbitrary relative position.
Although a detailed description and illustration of the locking device (4) are omitted, a slide bar (41) constituting a part of the locking device (4) is provided along the length direction on the front side portion of the first scaffold plate member (20A). It is attached.
The bar (41) is formed from a metal pipe having a circular cross section. The length of the bar (41) is slightly shorter than the length of the first scaffold plate member (20A). The left end portion of the bar (41) is fixed to the left end portion of the main material (21A) located on the front side portion of the first scaffold plate member (20A) by the fixing bracket (6).

As shown in FIG. 5, the fixing bracket (6) has a base portion (61) having a substantially vertical cross section and a rear portion extending from the upper edge of the rear wall of the base portion (61) to be overlapped on the upper surface of the main material (21A). An overhang part (62) and a lower overhang part (63) extending rearward from the lower edge of the rear wall of the base part (61) and overlapping the lower surface of the main material (21A) are provided. The rear wall of the base portion (61) is divided at the center of the height, and a cross-section arc-shaped holding portion (64) for holding the slide bar (41) from above and below is formed at the upper and lower cut ends. Has been.
Then, the tip of the mounting bolt (65) passed through the connecting wall portion (213) of the main material (21A) is screwed into a bolt hole horizontally formed at a predetermined length position of the bar (41). Thus, the bar (41) is fixed.
In order to balance the first scaffolding plate member (20A) at the right end of the main material (21) located at the rear side of the second scaffolding plate member (20B), the fixing bracket (6) The same thing is attached (refer Fig.1 (a)).

3 to 7 show details of the locking device (30) of the leg (3) of the scaffolding base (1).
These drawings show the configuration of the locking device (30) in the front side portion of the left end portion of the top plate (2). Only the illustrated part will be described below.

The connecting bracket (33) that attaches the upper end of the front and rear struts (31) of the left leg (3) to the front and rear parts of the left end of the top plate (2) is the front and rear sides of the left end of the top plate (2). The front and rear fixing plates (34) are fixedly attached to the respective parts, and the front and rear fixing plates (34) are attached to the front and rear fixing plates (34) so as to be rotatable about the horizontal axis, and And two front and rear rotating plates (35) fixedly attached to the upper end.
An upper edge portion of the flap (5) is attached to the left end portion of the top plate (2) so as to be swingable about an axis extending in the front-rear direction.
Each fixed plate (34) has a pin insertion hole (342a) that is long in the left-right direction.
One lock pin (7) is attached to the flap (5) so that both ends thereof can be inserted into the pin insertion holes (342a) of the front and rear fixing plates (34).
The flap (5) and the lock pin (7) are biased rightward (inward in the left-right direction) by the compression coil spring (8) (biasing means).
A first locking recess (352a) to which the end of the lock pin (7) is locked when the leg (3) is rotated to the use position (see FIG. 1) at the edge of each rotating plate (35) And a second locking recess (352b) in which the end of the lock pin (7) is locked when the leg (3) is rotated to the storage position (see FIG. 2), and the first locking recess (352a) ) And the second locking recess (352b) and an arcuate guide edge (352c) for guiding the end of the lock pin (7) is formed.
Then, the end of the lock pin (7) is disengaged from the first locking recess (352a) or the second locking recess (352b) by swinging the flap (5) leftward (toward the left-right direction). The left leg (3) can be rotated from the use position to the storage position or vice versa.

The connecting frame member (22B) located at the left end of the first scaffold plate member (20A) is a vertical wall extending in the front-rear direction so as to cover the left end openings of the main members (21) (21A) and the fixing bracket (6). 221), an upper horizontal wall (222) that extends from the upper edge of the vertical wall (221) to the right and is superimposed on the upper surface of the main material (21) (21A) and the fixing bracket (6), and a vertical wall (221) The main material (21) (21A) and the lower horizontal wall (223) superimposed on the lower surface of the fixing bracket (6) are extended to the right from the lower edge of the upper and lower horizontal walls (222) (223) The main material (21) (21A) and the fixing bracket (6) are respectively fixed to the upper and lower surfaces with rivets or the like. The left and right outer surfaces of the vertical wall (221) of the connection frame member (22B) constitute the left end surface of the top plate (2).
A cover wall (224) extending on the opposite side of the upper horizontal wall (222) is integrally formed on the upper edge of the vertical wall (221) of the connecting frame member (22B). The cover wall (224) extends leftward from the upper edge of the vertical wall (221), and then extends obliquely downward to the left. The lower edge portion of the cover wall (224) is formed of a bent edge portion (224a) having a substantially L-shaped cross section that is bent at a right angle toward the right and further bent so that the tip is inclined obliquely upward to the right.
That is, the connecting frame member (22B) also functions as an end surface / cover wall constituting member constituting the end surface of the top plate (2) and the cover wall (224). The connecting frame member (22B) is made of a metal shape such as an aluminum alloy.
A hinge groove (225) extending in the front-rear direction and having a circular cross section is formed at the intersection of the vertical wall (221) and the cover wall (224) in the connecting frame member (22B). The opening of the hinge groove (225) faces diagonally to the left.

  The flap (5) is disposed in the space between the left end surface of the top plate (2) (that is, the vertical wall (221) of the connecting frame member (22B)) and the cover wall (224) so as to be swingable in the left-right direction and A flap main body (51) having a lock pin holding portion (511) and an operation lever (52) extending rightward so as to protrude out of the space from the lower edge portion of the flap main body (51) are integrally provided. Yes. The flap (5) is made of a metal shape such as an aluminum alloy.

The flap main body (51) has a plate-like shape extending in the front-rear direction, and its upper edge is bent in a crank shape.
Also, a hinge shaft (512) having a circular cross section that is fitted into the hinge groove (225) so as to be rotatable relative to the hinge groove (225) is formed continuously to the upper edge of the flap main body (51).

The lock pin holding portion (511) is formed of a groove with a circular cross section formed to open to the left at the lower edge portion of the flap main body (51).
The lock pin (7) is made of a metal round bar and is held in the flap (5) by being tightly fitted into the lock pin holding portion (511) made of the groove, and swings together with the flap (5). It is supposed to be made. Further, the lock pin (7) has such a length that both end portions thereof protrude from the front and rear ends of the groove (511).
In addition, the lock pin (7) may be divided into two front and rear round bars in addition to the one round bar as described above.

  An internal enlarged groove (513) extending in the front-rear direction and opening to the left is formed in the middle part of the height of the flap main body (51). One end of the compression coil spring (8) is fitted into the internal enlarged groove (513). The other end of the compression coil spring (8) is fitted and held between two upper and lower horizontal ridges (224b) formed at predetermined intervals on the inner surface of the cover wall (224). Further, in order to prevent the compression coil spring (8) from moving in the front-rear direction, a fixing screw (53) passes through the bottom of the internal enlarged groove (513) in the flap main body (51), and the compression coil spring ( 8) It is screwed so as to be inserted into it (see FIGS. 6 and 7).

  The control lever (52) has two upper and lower arc-shaped wall portions (521) and (522) that extend rightward from the lower edge portion of the flap main body (51) and whose cross section is an arc shape centering on the hinge shaft (512). And a connecting wall portion (523) that connects the tips of the upper and lower arc-shaped wall portions (521) and (522), and a drooping while slightly curving from the tip of the lower arc-shaped wall portion (522) to the lower right. And a wall portion (524) (see FIGS. 6 and 7). The hanging wall portion (524) functions as a knob for swinging the flap (5). When the flap (5) swings, the upper surface of the upper arcuate wall (521) is in sliding contact with the lower surface of the guide wall (225) that extends to the left from the lower edge of the vertical wall (221) of the connecting frame member (22B). It is supposed to be made.

The fixing plate (34) is provided on the front surface of the fixing bracket (6) with a rivet or the like, connected to the left side of the fixing portion (341), and connected to the connecting frame member (22B) and the flap. Cover (342) covering the front end of (5), and a connecting portion provided on the lower side of the fixed portion (341) and the lower right side of the cover (342) and having a shaft insertion hole (343a) ( 343).
The fixed portion (341) is formed with a laterally oval punched portion (341a).
The covering portion (342) is formed with a pin insertion hole (342a) through which the front end portion of the lock pin (7) is inserted. The pin insertion hole (342a) is a long hole that is long in the left-right direction, more specifically, a swinging center of the flap (5), that is, a short arc-shaped hole centering on the hinge shaft (512). The pin insertion hole (342a) regulates the swing range of the flap (5), and hence the movement range of the lock pin (7).
A presser frame (36) having an L-shaped cross section is fitted over the left edge portion of the cover (342). Two tapping screws (37) pass through the presser frame (36) and the covering portion (342) of the fixing plate (34) and are formed horizontally at two locations on the inner surface of the cover wall (224). The fixing plate (34) is connected and fixed to the connecting frame member (22B) by being screwed into the tapping screw groove (224c) having a substantially C-shaped cross section.
A bent edge (342b) bent at a right angle toward the rear is formed on the lower edge of the cover (342) so as to overlap the lower surface of the bent edge (224a) of the cover wall (224). (See Figure 3).
The shaft insertion hole (343a) formed in the connecting portion (343) is positioned to the right of the flap (5) below the top plate (2). The portion (343b) around the shaft insertion hole (343a) in the connecting portion (343) reduces the contact area with the rotating plate (35), and the rotating plate (35) can be rotated smoothly. In order to do so, it is projected in a substantially hemispherical shape toward the front.
In addition, in the rear part of the left end part of the first scaffold plate member (20A), the fixing plate (34) is fixed to the rear surface of the main material (21).

The rotating plate (35) is provided continuously to the fixed portion (351) fixed to the front upper end portion of the support column (31) with a rivet and the right and upper right portions of the fixed portion (351), and the fixed plate It is a vertically long one provided with a connecting portion (352) having a shaft insertion hole (352d) that matches the shaft insertion hole (343a) of (34).
The fixing portion (351) is formed into a substantially vertical rectangle so as to be overlapped with the upper front end portion of the support post (31).
The right edge of the connecting portion (352) extends obliquely upward to the right from the fixed portion (351), and a shaft insertion hole (352d) is provided close to the middle of the length of the right edge. Then, the bolt (361) is inserted through the washer (363) into the shaft insertion hole (342a) (352d) of the fixed plate (34) and the rotating plate (35), and a nut ( 362) is screwed, so that both plates (34) and (35) are relatively rotatable around a bolt (361) (horizontal axis).
From the upper edge to the left edge of the connection part (352), it has an arc shape centered on the shaft insertion hole (352d). A first locking recess (352a) is formed at the lower portion of the arc-shaped left edge of the connecting portion (352), and a second locking recess (352b) is formed at the arc-shaped upper edge of the connecting portion (352). A portion between the first locking recess (352a) and the second locking recess (352b) is a guide edge (352c). The first locking recess (352a) is a large substantially U-shape that reaches the upper edge of the fixed portion (351). The front end of the lock pin (7) is locked to the upper end of the first locking recess (352a). The second locking recess (352b) is substantially U-shaped.

  As shown in FIG. 1 and FIG. 2, the fixed plate (34) and the rotating plate (35) provided on both the front and rear sides of the right end of the top plate (2), The connected bolt (361), that is, the distance from the center of relative rotation of both plates (34) and (35) to the upper end of the column (31) is on both the front and rear sides of the left end of the top plate (2). Compared to the fixed plate (34) and the rotating plate (35) provided, the radius of the guide edge (352c) of the rotating plate (35) is also slightly increased. Yes. With the above configuration, the right leg (3) can be folded under the left leg (3) that has been folded first on the back side of the top plate (2).

Next, a method of using the locking device (30) for the leg (3) of the scaffold (1) will be described below.
First, as shown in FIG. 1 and FIGS. 4 to 6, when the leg (3) of the scaffolding base (1) is in a downward-facing state, the end of the lock pin (7) is attached to the rotating plate (35). The locking pin (7) is locked to the first locking recess (352a), and the lock pin (7) is flap (5) so that the end of the lock pin (7) does not come off from the first locking recess (352a). At the same time, it is biased inward in the left-right direction by the spring elastic force of the compression coil spring (8).
Then, the worker climbs on the top plate (2) of the scaffolding base (1) installed at the required location via the ladder-shaped leg (3) and works here. Since (3) is locked at the use position with the tip downward by the locking device (30), there is no risk of accidental rotation during work, and it can be used safely. In addition, since the outer side of the flap (5) in the left-right direction is covered with the cover wall (224), for example, when raising or lowering the leg (3), a hand or foot hits the operation lever (52) of the flap (5). Thus, there is no risk of the lock state being released unexpectedly, and safety is improved.

Next, when moving the scaffolding base (1) from the above-mentioned usage state to the state where the legs (3) are folded (see FIG. 2), the operation lever (52) of the flap (5) is moved to the compression coil spring (8). Pull outwards in the left-right direction with your hand against the spring elastic force. Here, since the flap (5) is swingably attached to the connecting frame member (22B) via the hinge shaft (512) and the hinge groove (225), the above operation can be performed smoothly and easily. Can do. As a result of the above operation, the end of the lock pin (7) moves outward in the left-right direction along the pin insertion hole (342a) of the fixing plate (34), and the end of the lock pin (7) is moved accordingly. When the rotating plate (35) is disengaged from the first locking recess (352a), the rotating plate (35) and thus the leg (3) are unlocked so that the leg (3) is attached to the top plate ( Fold it to the back side of 2) (see Fig. 7). At this time, the end of the lock pin (7) smoothly moves relatively along the guide edge (352c) of the rotating plate (35) and is guided to the second locking recess (352b).
When the leg (3) is rotated by the required angle and folded to the back side of the top plate (2), the end of the lock pin (7) is turned by the spring elastic force of the compression coil spring (8). It fits into the second locking recess (352b) of (35) and is engaged therewith, and is again locked (see FIG. 2). In this state, the scaffolding (1) is transported or stored.

As described above, according to the locking device (30) for the leg (3) of the scaffolding base (1) according to this embodiment, the locking and unlocking of the leg (3) in the use position and the storage position are extremely simple operations. Compared with the conventional device described in Patent Document 1 described above, usability and convenience are greatly improved.
In the case of the above device (30), since the flap (5) is covered with the cover wall (224), the operator's limbs, materials, etc. come into contact with the flap (5) and the locked state is released unexpectedly. The appearance is also good. In addition, the unlocking operation is excellent in operability because the operation lever (52) provided on the flap (5) is simply held and moved outward in the left-right direction.
Further, in the locking device (30), since the compression coil spring (8) is used as a means for biasing the flap (5), it is excellent in durability and its mounting structure is simple. Cost can be reduced.
Further, according to the locking device (30), the left and right end faces of the top plate (2) and the connecting frame member (22B) (end face / cover wall constituting member) constituting the cover wall (224) and the flap (5 ) Is made of a metal shape, and the two constituent members (22B) and (5) can swing relative to each other by the hinge shaft (512) and the hinge groove (225) that are provided integrally therewith. Since the structure is simplified and manufacturing is easy, the swinging motion of the flap (5) is stable, and there is no need for fine position setting and adjustment of the compression coil spring (8). Since the spring elastic force of the compression coil spring (8) can be applied uniformly to the entire flap (5) and eventually to the lock pin (7), there is no problem in operation.

  The above-described embodiment is merely an example, and it is of course possible to implement the present invention as a mode appropriately modified without departing from the scope described in the claims.

(1): Scaffolding stand
(2): Top board (extensible scaffold board)
(22B): Connecting frame material (end face / cover wall component)
(224): Cover wall
(225): Hinge shaft
(3): Leg
(30): Leg locking device
(31): Prop
(33): Connecting bracket
(34): Fixed plate
(342a): Pin insertion hole
(35): Rotating plate
(352a): First locking recess
(352b): Second locking recess
(352c): Guide edge
(361): Bolt (horizontal axis)
(5): Flap (Flap component)
(51): Flap subject
(511): Lock pin holder
(52): Control lever
(7): Lock pin
(8): Compression coil spring (biasing means)

Claims (4)

The upper ends of the two front and rear struts are attached to the front and rear side portions of the left and right ends of the top plate via connecting brackets, and the connecting brackets are front and rear side portions of the left and right ends of the top plate. The front and rear two fixed plates each fixedly attached to the front and rear, and the front and rear two fixedly attached to the front and rear fixed plates so as to be rotatable around a horizontal axis and fixedly attached to the upper ends of the front and rear columns. A locking device for locking a leg at each of a use position facing downward at the front end and a storage position folded on the back side of the top board,
The upper edge of the flap is attached to the left and right ends of the top plate so that it can swing around the axis extending in the front-rear direction.
Long pin insertion holes in the left and right direction are formed in the front and rear fixed plates,
The lock pin is attached to the flap so that its end can be inserted into the pin insertion hole of the front and rear fixing plate,
The flap and the lock pin are urged inward in the left-right direction by the urging means,
A first locking recess for locking the end of the lock pin when the leg is rotated to the use position at the edge of each of the front and rear rotation plates, and a lock pin when the leg is rotated to the storage position A second locking recess for locking the end, and an arcuate guide edge provided between the first locking recess and the second locking recess for guiding the end of the lock pin; ,
By swinging the flap outward in the left-right direction, the end of the lock pin can be disengaged from the first locking recess or the second locking recess and the leg can be rotated from the use position to the storage position or vice versa. A locking device for a foot of a scaffolding, characterized in that A cover wall is provided that extends downward from the upper edge of each of the left and right end faces of the top board with a gap from the flap.
A flap main body having a lock pin holding portion that is swingably disposed in a space between the end surface of the top plate and the cover wall, and extends so as to protrude from the lower edge portion of the flap main body to the outside of the space The scaffolding leg locking device according to claim 1, further comprising an operation lever.   3. The scaffolding leg locking device according to claim 2, wherein the urging means comprises at least one compression coil spring interposed between the facing portions of the cover wall and the flap. The left and right end faces and the cover wall of the top plate are configured by end face / cover wall constituent members made of a shape material, and the flap is made of a flap constituent member made of a shape material, and one of the two constituent members A hinge shaft extending in the front-rear direction is formed at a predetermined location, and a hinge groove is formed at the other predetermined location so as to be relatively rotatable with the hinge shaft. The locking device for the foot of the scaffolding according to 2 or 3.

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