JP5427094B2 - Temporary staircase step angle adjustment device - Google Patents

Description

  The present invention relates to a step angle adjusting device for a temporary staircase that is temporarily installed so that an operator ascends and descends at a construction site.

  This type of temporary staircase is a step member between a temporary staircase side frame composed of a pair of left and right single pipes (steel pipes) that are temporarily installed at an angle between the upper floor and the lower floor. (Footboard) is constructed. At this time, the angle of the pair of left and right temporary staircase side frames usually changes depending on various surrounding conditions. On the other hand, the step member must always be installed horizontally. A step angle adjusting device is required. Thus, as described in Patent Documents 1 and 2, the conventional step angle adjusting device for temporary staircases is provided for the temporary staircase on the left and right sides of a step member installed between a pair of left and right temporary staircase side frames. A clamp and a locking member for the side frame are provided, and the clamp is rotatably supported on a step member around a concentric horizontal axis, and a rotating member that rotates integrally with the clamp is provided. The rotating member is provided with locked portions at appropriate intervals in the circumferential direction of the horizontal axis, and the locking member is attached to the step member so as to be detachable from the locked portion. ing. Specifically, in the step angle adjusting device described in Patent Document 1, the locking member moves in the horizontal axis direction to engage / disengage with the locked portion on the rotating member side. In the step angle adjusting device described in Patent Document 2, the locking member is of a lever type that is supported by a support shaft parallel to the horizontal axis.

JP-A-6-193250 Japanese Patent No. 2946327

  In each of the step angle adjusting devices described in Patent Documents 1 and 2, a bolt and nut for fixing the locking member at the locking position is necessary. When adjusting the step angle, the bolt nut is loosened using a tool. Since an operation and a strong fastening operation are required, the operation is troublesome and a great amount of labor is required. In addition, if the bolts and nuts loosen for some reason, the locking member on the step member side may come off from the locked part of the rotating member on the clamp side, and the step member may become free. was there.

  The present invention proposes a step angle adjusting device for a temporary staircase that can solve the conventional problems as described above, and the step angle adjusting device for a temporary staircase according to the present invention according to claim 1. Is a pair of left and right temporary staircase side frames (2a, 2b) when the reference numerals used in the description of the embodiment are shown in parentheses for easy understanding of the relationship with the embodiment described later. A clamp (7), a locking member (9), and a stopper member (10) for the temporary staircase side frames (2a, 2b) are provided on the left and right sides of the step member (1) installed between the clamp members. (7) is supported by the step member (1) so as to be rotatable around concentric horizontal axes, and provided with a rotating member (8) that rotates integrally with the clamp (7). The rotating member (8) is provided with locked portions (8a) at appropriate intervals in the circumferential direction of the horizontal axis. The stop member (9) is attached to the step member (1) so that the distal end portion (9a) can be engaged with and disengaged from the locked portion (8a) and is movable in the radial direction of the rotating member (8). The stopper member (10) is attached to the step member (1) so as to be movable in the vertical direction perpendicular to the moving direction of the locking member (9). When in the position, it engages with the locking member (9) at the forward limit position where the tip end portion (9a) engages with the locked portion (8a), and the locking member (9) It is configured to prevent the backward movement to be detached from the locked portion (8a).

  When carrying out the present invention, specifically, as described in claim 2, the rotating member (8) is provided with a peripheral wall portion (17b) concentric with the horizontal axis, and the peripheral wall portion ( 17b) constitutes the locked portion (8a) by holes provided at appropriate intervals in the circumferential direction, and the step member (1) is provided inside the peripheral wall portion (17b) of the rotating member (8). A projecting plate (31) to be inserted protrudes, and a locking hole into which the tip end portion (9a) of the locking member (9) penetrating the locked portion (8a) is inserted into the protruding plate (31). (31a) can be provided.

  According to a third aspect of the present invention, the locking member (9) includes a horizontal plate portion (26a) having a distal end portion (9a) that is detachable from the locked portion (8a). The vertical plate portion (26b) hanging from the inner side of the horizontal plate portion (26a), the vertical plate portion (26b) is fixed through the long hole (27) and the long hole (27). When the pin (28a, 28b) is attached to the side of the step member (1) to be movable within a certain range, and the locking member (9) is moved to the outer side of the horizontal plate portion (26a). The operation pieces (30a, 30b) can be connected in series.

  In the case of adopting the configuration according to the third aspect, as described in the fourth aspect, the side of the step member (1) is provided on the horizontal plate portion (26a) of the locking member (9). The presser foot (29) that overlaps with can be projected. According to a fifth aspect of the present invention, the stopper member (10) is fixed to the upper surface of the side frame member (4a, 4b) of the step member (1) and protrudes laterally. ) In the vertical direction, and at the upper end is provided with a head (10a) that rides on the mounting member (32) when in the lower limit position, and the stopper member (10) in the lower limit position In addition, it can be configured to be adjacent to the rear side of the horizontal plate portion (26a) of the locking member (9) in the forward limit position.

  According to the configuration of the present invention described in claim 1, the left and right sides of the step member are coupled to the pair of left and right temporary stair side frames by clamps, respectively, and the pair of left and right temporary stair side frames are placed at the temporary stair position. After installation at an appropriate angle, the step member is rotated around the horizontal axis to be in a substantially horizontal state. In this state, the locking member is slid toward the rotating member on the clamp side, and the tip of the step member is moved to the rotating member. To be engaged with one locked portion. In this state, the stopper member is lowered to the lower limit position, and the stopper member is switched to a state in which the stopper member is prevented from moving backward from the forward limit position. Thus, the step member between the pair of left and right temporary stair side frames is locked in a substantially horizontal posture, but the stopper member lowered to the lower limit position is set to a predetermined height, that is, a locking member that moves backward. Step in a substantially horizontal posture unless the operation of pulling up to a height that does not interfere and the operation of retracting the locking member at the forward limit position to disengage the tip from the locked portion of the rotating member on the clamp side The member cannot be unlocked.

  Therefore, not only is it freed from troublesome and labor-intensive operations such as loosening and fastening operations of bolts and nuts using tools, but the locked state of the step member is not maintained by the fastening force of the bolts and nuts. In addition, there is no possibility of a dangerous situation in which the lock of the step member is unexpectedly released due to vibration or the like, and the safety is greatly improved. In addition, it is impossible to reliably determine from the appearance whether the fastening force of the bolt and nut is sufficient, but in the configuration of the present invention, the step member depends on whether or not the stopper member is lowered to the lower limit position. Since it can be determined whether or not it is locked, whether or not the step member is locked can be determined very simply and reliably from the appearance, and this can also be used safely.

  When the step member is locked at a predetermined angle, a large bending force acts on the distal end portion of the locking member due to a large load acting on the step member when the worker ascends and descends. However, according to the configuration of the second aspect, the tip end portion of the locking member that penetrates the locked hole on the rotating member side to the inside of the protruding plate on the step member side to which the locking member is attached. Since it can be supported by the locked hole, a dangerous situation where the leading end of the locking member bends from the locked hole on the rotating member side due to a large load acting on the step member when the worker ascends and descends Can be prevented in advance. And the front-end | tip part of the said latching member and the projection member by the side of the step member which supports this can be covered and protected by the rotation member by the side of a clamp.

  Moreover, according to the structure of Claim 3, locking member itself and its attachment structure become simple, and this invention can be implemented easily and cheaply. Moreover, the operation of moving the locking member back and forth can be easily performed with the operation piece. Further, the locking member has an L-shaped cross section except for a tip portion that can be freely inserted into and removed from the locked portion of the rotating member, and is strong against bending. The cover plate can prevent the locking member from escaping upward with respect to the step member due to a large load acting on the step member when the worker ascends and descends. Therefore, it is possible to sufficiently ensure safety while adopting a simple structure including a long hole and a fixing pin for attaching the locking member to the step member.

  Furthermore, according to the structure of claim 5, the stopper member is provided with one head-attached pin only by providing an attachment member that is fixed to the upper surface of the side frame member of the tep member and protrudes laterally. In addition, the stopper member can be easily attached, and it is not necessary to provide a special portion for engaging the stopper member on the locking member side. Therefore, the present invention can be implemented easily and inexpensively.

Fig. A is a transverse plan view showing one step member of the temporary staircase, and Fig. B is a side view showing one step member of the temporary staircase. It is a partially vertical side view which shows the angle adjustment apparatus in a locked action state. FIG. 3 is an enlarged sectional view taken along line XX in FIG. 2. FIG. 3 is a transverse plan view of FIG. 2. It is a partially vertical side view which shows the angle adjustment apparatus in a lock release state. It is a partial exploded front view of the principal part of an angle adjustment apparatus. It is a side view which shows the rotation member to which a clamp and the said clamp are attached.

  In FIG. 1, 1 is a step member, 2a and 2b are a pair of left and right temporary staircase side frames using a single pipe (steel pipe), and 3A and 3B are angle adjusting devices attached to the left and right sides of the step member 1. . The step member 1 is connected and integrated between the front and rear end portions and the center portion of the left and right side frame members 4a and 4b using square steel pipes by connecting frame members 5a to 5c similarly using square steel pipes, and an expanded metal on the upper surface side. It is a conventionally well-known thing comprised by extending | stretching tread surface formation members 6, such as. The angle adjusting devices 3A and 3B have a bilaterally symmetric structure, and are constituted by a pipe clamp 7, a rotating member 8, a locking member 9, and a stopper member 10, respectively.

  Hereinafter, the pipe clamp 7 will be described in detail with reference to FIGS. 2 to 7. The pipe clamp 7 includes a base member 11, a presser member 13 that is pivotally supported on one end of the base member 11 around the support shaft 12, and a base member. A fastening bolt 15 that is pivotally supported around the support shaft 14 at the other end of the shaft 11 and that can be freely fitted to and detached from the free end bifurcated portion 13a of the pressing member 13, and a nut that is screwed into the fastening bolt 15 16, with the temporary staircase side frames 2 a and 2 b fitted between the base member 11 and the presser member 13, the fastening bolt 15 is fitted to the free end bifurcated portion 13 a of the presser member 13, Arbitrary positions in the length direction of the temporary stair side frames 2a and 2b are obtained by screwing the nut 16 positioned outside the free end bifurcated portion 13a of the pressing member 13 to tighten the pressing member 13 toward the base member 11 side. It can be fixed to

  The rotating member 8 is attached to the outside of the base member 11 of the pipe clamp 7 having the above configuration. The rotating member 8 is formed by integrally connecting a short cylindrical peripheral wall portion 17b on one side from the periphery of the circular plate portion 17a. As shown in FIGS. 6 and 7, the center of the circular plate portion 17a is provided. At the position, a square hole 18a formed by a burring peripheral wall 18b protruding on the same side as the peripheral wall portion 17b is provided, and at a position slightly apart from the square hole 18a of the circular plate portion 17a, the side opposite to the peripheral wall portion 17b is provided. Two protrusions 19a and 19b formed by a burring peripheral wall projecting in the direction are integrally provided. The flat bottom plate portion 11a of the base member 11 of the pipe clamp 7 has a square hole 20 having substantially the same size as the square hole 18a and two through holes 21a and 21b into which the two protrusions 19a and 19b are fitted. Is provided. The cylindrical peripheral wall portion 17b of the rotary member 8 is provided with rectangular locked holes 8a that are long in the axial direction of the rotary member 8 at equal intervals in the circumferential direction.

  The pipe clamp 7 and the rotating member 8 are fastened to each other by a bolt 22 and a nut 23 with a square shaft portion. That is, the rotating member 8 is fitted to the outside of the bottom plate portion 11a of the base member 11 in the pipe clamp 7, the two protrusions 19a and 19b are fitted into the two through holes 21a and 21b, and the square holes 18a and 20 are matched with each other. The square shaft portion 23a of the nut 23 with the square shaft portion is inserted into the square hole 18a of the rotary member 8 and the square hole 20 of the bottom plate portion 11a of the base member 11 from the inside of the rotary member 8, and the bolt 22 is screwed through the nut 23 with a square shaft portion in the square hole 20 from the base member 11 side of the pipe clamp 7, and the head body 22 a of the bolt 22 and the nut body 23 b of the nut 23 with the square shaft portion Thus, the bottom plate portion 11a of the base member 11 of the pipe clamp 7 and the burring peripheral wall 18b of the square hole 18a of the rotating member 8 are sandwiched and turned to the outside of the base member 11 of the pipe clamp 7. Member 8 is attached. In this state, the pipe clamp 7 and the rotating member 8 are fitted to the two protrusions 19a and 19b and the two through holes 21a and 21b, and the square shaft portion 23a and the square hole 18a of the nut 23 with the square shaft portion. 20 is integrated so that relative rotation is impossible, and the bolt 22 is fixed to the two.

  The pipe clamp 7 to which the rotating member 8 is fixed as described above is attached to the front side of the lateral side surfaces of the side frame members 4a and 4b of the step member 1 by the bolts 22 and the double nuts 24. That is, as shown in FIG. 6, the side frame members 4 a and 4 b of the step member 1 are provided with through holes 25 through which the bolts 22 can be inserted just concentrically in the horizontal direction and projecting inward from the rotating member 8. The bolt 22 is inserted through the through-hole 25, the double nut 24 is inserted into the bolt 22 projecting inside the side frame members 4a and 4b, and the three members of the pipe clamp 7, the rotating member 8 and the bolt 22 attach the bolt 22. Fasten to the center for rotation. In order to prevent the three of the pipe clamp 7, the rotating member 8, and the bolt 22 from being fixed to the side frame members 4 a and 4 b so as not to rotate due to excessive tightening of the double nut 24, the nut 23 with a square shaft portion is used. Alternatively, a sleeve having a required length may be externally fitted to the bolt 22, and the sleeve may be clamped and fixed between the nut 23 with a square shaft portion and the double nut 24 in the axial direction.

  The locking member 9 has an L-shaped cross section composed of a horizontal plate portion 26a and a vertical plate portion 26b that is continuously bent at a right angle downward from the inner side of the horizontal plate portion 26a. A side frame is formed by a longitudinal hole 27 in the front-rear direction provided in 26 b and two fixing pins 28 a and 28 b that horizontally penetrate the side frame members 4 a and 4 b of the step member 1 in a state of passing through the long hole 27. Along the lateral sides of the materials 4a and 4b, they are attached so as to be movable in the front-rear direction within a certain range. On the side frame members 4 a and 4 b of the step member 1, a pressing member 29 made of a thick plate is provided so as to be fixed on the horizontal plate portion 26 a of the locking member 9, and the lower surface of the pressing member 29 is fixed to the locking member 9. The horizontal plate portion 26a is configured to slide forward and backward. Further, the locking member 9 is integrally provided with a front end portion 9a extending forward from the horizontal plate portion 26a and a pair of front and rear operation pieces 30a, 30b projecting upward outside the pressing member 29. ing.

  Thus, the locking member 9 can be moved back and forth within the relative movement range of the long hole 27 with respect to the two fixing pins 28a and 28b. 9a can be passed through one of the locked holes 8a provided in the peripheral wall portion 17b of the rotating member 8. At this time, the distal end portion 9a of the locking member 9 penetrating the locked hole 8a penetrates simultaneously. A protruding plate 31 having a locked hole 31 a that can be formed is fixedly projected on the side frame members 4 a and 4 b of the step member 1 so as to be adjacent to the inside of the peripheral wall portion 17 b of the rotating member 8.

  The side frame members 4a and 4b of the step member 1 are fixed to the upper surfaces of the side frame members 4a and 4b in the region from the upper position of the pressing member 29 to the rear end positions of the side frame members 4a and 4b. A mounting member 32 utilizing a square steel pipe is provided. The stopper member 10 penetrates the mounting member 32 so as to freely move up and down, and a cylinder provided with a head 10a on the upper end when the stopper member 10 is lowered to the lower limit position. The stopper member 10 made of a shaft-like member and lowered to the lower limit position is disposed adjacent to the rear side of the horizontal plate portion 26a of the locking member 9 moved to the forward limit position.

  The step member 1 provided with the angle adjusting devices 3A and 3B on the left and right sides uses the pipe clamp 7 of the angle adjusting devices 3A and 3B, as described above, and a pair of left and right temporary stair side frames 2a and 2b. Are attached at appropriate intervals. The pair of left and right temporary stair side frames 2a and 2b are arranged and fixed at a predetermined angle depending on the place where the staircase is temporarily installed. Is fixed in a substantially horizontal posture, the angle θ between the temporary stair side frames 2a and 2b and each step member 1 shown in FIG. 1B is adjusted by the angle adjusting devices 3A and 3B.

  That is, as shown in FIG. 5, the stopper member 10 is pulled up using the operation pieces 30 a and 30 b in a state where the lower end of the stopper member 10 is raised above the horizontal plate portion 26 a of the locking member 9. Is moved backward to the retreat limit position in a direction away from the rotating member 8, and the tip end portion 9a is detached from the locked hole 8a of the peripheral wall portion 17b of the rotating member 8 to switch to the unlocked state, whereby the side frame for the temporary staircase The step member 1 becomes rotatable about the bolt 22 with respect to the pipe clamp 7 and the rotating member 8 fixed to 2a and 2b. At this time, when the hand is released from the stopper member 10 that has been lifted, the lower end of the stopper member 10 that descends due to gravity gets on the horizontal plate portion 26a of the locking member 9 at the retreat limit position. In this state, the step member 1 is rotated around the bolt 22 and adjusted to a substantially horizontal posture, and the tip end portion 9a of the locking member 9 is opposed to one of the locked holes 8a of the peripheral wall portion 17b of the rotating member 8. Let Next, as shown in FIGS. 2 and 4, the locking member 9 is moved forward to the forward limit position using the operation pieces 30 a and 30 b, and the tip end portion 9 a is covered with the peripheral wall portion 17 b of the rotating member 8. By passing through one of the locking holes 8 a and passing through the locked hole 31 a of the protruding plate 31, the step member 1 is brought into a locked state in which it cannot rotate around the bolt 22. When the locking member 9 is moved forward to the forward limit position, the stopper member 10 whose lower end is on the horizontal plate portion 26 a of the locking member 9 is moved horizontally from the lower end of the stopper member 10. Since the plate portion 26a is moved forward, the plate portion 26a is lowered by gravity, is stabilized at the lower limit position where the head portion 10a rides on the mounting member 32, and the locking member 9 at the forward limit position is prevented from moving backward.

  As described above, the angle of each step member 1 installed between the pair of left and right temporary staircase side frames 2a and 2b can be adjusted to a substantially horizontal posture, and the step member 1 after the angle adjustment is a stopper member 10. It is possible to safely use it as a temporary stair step because it cannot be rotated around the bolt 22 unless it is subjected to a two-step operation of lifting the locking member 9 and moving the locking member 9 backward.

  Note that the structure for supporting the locking member 9 so as to be movable back and forth within a certain range is not limited to the structure of the above-described embodiment, and any structure may be used. When the fixing pins 28a and 28b are used, the long holes 27 are provided on the side frame members 4a and 4b side of the step member 1, and the two fixing pins 28a and 28b are attached to the vertical plate portion 26b of the locking member 9. You can also Further, the structure for fixing the rotating member 8 to the base member 11 of the pipe clamp 7 is not limited to the structure of the above embodiment. For example, the rotating member 8 is fixedly integrated with the base member 11 of the pipe clamp 7 by welding. May be.

  Furthermore, although the rectangular through-hole (locked hole 8a) is provided as the locked portion of the rotating member 8, the locked portion is configured by a recessed portion formed by cutting from the peripheral edge of the peripheral wall portion 17b of the rotating member 8. It is also possible. Further, the locking member 9 is not limited to one made of a plate material having an L-shaped cross section. For example, the locking member 9 can be constituted by a rod-like member that penetrates through cylindrical support members fixed to the side frame members 4a and 4b of the step member 1 so as to be movable back and forth.

  The temporary staircase step angle adjusting device according to the present invention has a step member erected between a temporary staircase side frame comprising a pair of left and right single pipes between an upper floor and a lower floor at a construction site. This can be used for temporary construction of stairs for ascending and descending workers.

DESCRIPTION OF SYMBOLS 1 Step member 2a, 2b Temporary stair side frame 3A, 3B Angle adjusting device 4a, 4b Step member side frame material 7 Pipe clamp 8 Rotating member 8a Locked hole 9 Locking member 9a Tip part 10 Stopper member 11 Pipe clamp Base member 13 Pipe clamp holding member 15 Pipe clamp fastening bolt 17b Rotating member peripheral wall 18a, 20 Square hole 19a, 19b Protrusion 22 Bolt 23 Square shaft nut 24 Double nut 26a Horizontal plate portion of locking member 26b Vertical plate portion of locking member 27 Long hole 28a, 28b Fixing pin 29 Holding member 30a, 30b Operation piece 31 Projection plate 32 Mounting member

Claims (5)

  A clamp, a locking member, and a stopper member for the temporary stair side frame are provided on the left and right sides of the step member installed between the pair of left and right temporary stair side frames, and the clamps are concentric horizontal axes. A rotating member that is pivotally supported by a step member so as to be rotatable around the clamp and that rotates together with the clamp is provided. The rotating member has a locked portion at an appropriate interval in the circumferential direction of the horizontal axis. The locking member is attached to the step member so that a distal end portion thereof can be engaged and disengaged with respect to the locked portion and is movable in a radial direction of the rotating member, and the stopper member is fixed to the locking member. When attached to the step member so as to be movable in the vertical direction perpendicular to the moving direction of the member, and when this stopper member is in the lower limit position, it is in the forward limit position where the tip portion engages with the locked portion. That the locking member engages with the of the locking member being configured to block rearward movement of withdrawal from the engaged portion, the step angle adjustment device of temporary stairway.   The rotating member has a peripheral wall portion concentric with the horizontal axis, and the locked portion is configured by holes provided in the peripheral wall portion at appropriate intervals in the circumferential direction. A protruding plate that enters the inside of the peripheral wall portion of the rotating member protrudes, and the protruding plate is provided with a locked hole into which a distal end portion of the locking member that penetrates the locked portion is fitted. Item 10. The step angle adjusting device for a temporary staircase according to Item 1.   The locking member includes a horizontal plate portion having a tip portion detachable with respect to the locked portion, and a vertical plate portion depending from an inner side of the horizontal plate portion. The portion is attached to the side of the step member by a long hole and a fixing pin that passes through the long hole so as to be movable within a certain range, and when the locking member is moved to the outer side of the horizontal plate portion The step angle adjusting device for a temporary staircase according to claim 1 or 2, wherein operation pieces are continuously provided.   4. The step angle adjusting device for a temporary staircase according to claim 3, wherein a pressing member that overlaps the horizontal plate portion of the locking member protrudes from a side of the step member.   The stopper member penetrates the mounting member fixed to the upper surface of the side frame member of the step member and protrudes laterally in the vertical direction, and the upper end is located on the mounting member when it is in the lower limit position. 5 or 4, wherein a head portion for riding is provided, and the stopper member at the lower limit position is configured to be adjacent to the rear side of the horizontal plate portion of the locking member at the forward limit position. Step angle adjusting device for temporary staircase as described.

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