JP4019214B2 - ladder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ladder, and more particularly, to a ladder that improves convenience when used while standing against a wall.
[0002]
[Prior art]
A ladder made up of a pair of left and right side trees and a plurality of pedestals is leaned against a building and used for various purposes. When the ladder is leaned against the wall, the upper end of the sidewood will come into contact with the wall. In this state, work on the wall (wallpaper painting, painting, etc.) at the top of the ladder is too close to the wall. There was a problem that it was difficult.
[0003]
Therefore, it has been proposed to improve the workability to the wall by attaching and detaching attachments (ladder fixing jigs) that provide a predetermined interval with the wall as required (for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 5-89799 [0005]
[Problems to be solved by the invention]
In the conventional ladder described above, it is difficult to move and store the ladder with the attachment attached, so that it is necessary to attach and detach the attachment every time the work is performed on the wall, which takes time.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a ladder that can adjust the space between the wall and the wall to facilitate the work on the wall, and eliminates the trouble of attaching and detaching the attachment for the wall work.
[0007]
[Means for Solving the Problems and Effects of the Invention]
The ladder according to the present invention includes a pair of left and right side trees, a plurality of step bars, and a distance adjusting device between the wall, the distance adjusting device with the wall, and a fixing bracket fixed to the upper end of the side tree, In a ladder having a movable bracket that is rotatably supported, an abutting member that is attached to the movable bracket and abuts against a wall, and a stopper that fixes the movable bracket in a used state and a stored state , the fixed bracket is A square tube portion fitted and fixed in the hollow side tree, and a left and right rising wall provided above the square tube portion, the left and right rising wall including a shaft insertion hole penetrating the central portion thereof, There is a notch for stopper engagement at the time of storage provided on the periphery and a notch for stopper engagement at the time of use at a position approximately 90 ° away from this, and the movable bracket is inserted into the shaft insertion hole of the fixed bracket. Corresponding shaft insertion holes are provided between the opposing walls of the fixing bracket. A wide portion that can be accommodated, and a narrow portion that is formed in an inverted U shape and is fitted in a recess provided in the contact member, between the front and rear walls of the narrow portion, for stopper support The pin is blocked and a stopper storage hole is provided in a portion above the shaft insertion hole of the wide portion. The stopper is rotatably supported at the upper end portion of the stopper by the stopper support pin. The torsion coil spring wound around the support pin is urged in the direction of exiting from the stopper housing hole, and the lower end of the stopper hits the notch edge of the fixing bracket. And the engagement between the stopper and the stopper engaging notch edge of the fixing bracket is released by pressing the intermediate portion of the stopper. The
[0008]
The contact member is formed of an elastic material such as rubber or synthetic resin so as not to damage the wall and to prevent slipping.
[0009]
According to the ladder of the present invention, the wall gap adjustment device is attached to the upper end of the side tree so as to protrude upward, the movable bracket supported rotatably on the fixed bracket, and the movable bracket. Since it has an abutting member that abuts against the wall and a stopper that fixes the movable bracket in use and in the stowed state, the movable bracket should be In a state where the movable metal fitting is positioned between the upper end of the side tree and the wall, the movement of the movable metal fitting may be prevented by the stopper. And, when the movable bracket is rotated and positioned on the extension of the side tree, the movement of the movable bracket is blocked by the stopper, so that no interval is required between the wall and the wall when working on the wall. And during transportation and storage, it can be handled in exactly the same way as a ladder without a device for adjusting the distance from the wall.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In this specification, “front” refers to the right in FIG. 1, “rear” refers to the left in FIG. 1, and left and right refer to the front.
[0012]
The ladder according to the present invention comprises a lower ladder (1) composed of a pair of left and right side trees (2) and a plurality of step bars (3), and a pair of left and right side trees (5) and a plurality of step bars (6). The upper ladder (4) slidably connected after the ladder (1), the upper ladder lifting rope (7) passed to both ladders (1) and (4), and the upper end of the lower ladder (1) A pulley (8) around which the lifting rope (7) is wound, and a rope holding member (9) provided at the lower end of the upper ladder (4) to hold the end of the lifting rope (7) The ladder that prevents the lower ladder (1) from moving downward relative to the lower ladder (1) in use and allows the upper ladder (4) to move when the upper ladder (4) is moved upward by a predetermined amount or more from this state. A lock / unlock device (10) and a wall that is rotatably provided at the upper end of the upper ladder (4) and adjusts the distance between the wall (W) and the ladder when the ladder is leaned against the wall (W). And an interval adjusting device (11).
[0013]
A U-shaped guide bracket (12) that guides the upper ladder (4) is fixed to the upper end of the lower ladder (1), and the pulley (8) is fixed to the right side of the bracket (12). It is supported by the pulley support bracket (13).
[0014]
The ladder locking / unlocking device (10) is a well-known device and its details are omitted, but it is attached to a predetermined position on the inner surface of each side tree (5) of the upper ladder (4) so as to be swingable downward and a spring. Is provided with a locking claw (10a) that is urged in the direction of the lower ladder (1) and fits to the step ladder (3) of the lower ladder (1) and extends the upper ladder (4) When (10a) stops extending immediately after the step ladder (3) of the lower ladder (1), the locking claw (10a) engages with the step ladder (3), and the upper ladder (4) If the extension is stopped after the extension claw (10a) exceeds the stepped bar (3) of the lower ladder (1) by a predetermined amount or more, the extension claw (10a) engages with the stepped bar (3). It is released and a contractible state is obtained.
[0015]
The rope holding member (9) is made of an aluminum extruded profile, and is attached to the outer surface of the lower end of the side tree (5) of the upper ladder (4) with the direction of extrusion directed vertically. As shown in FIG. 2 in an enlarged manner, the rope holding member (9) has a rear rope insertion portion (21) extending in the vertical direction and having a circular cross section through which one end of the lifting rope (7) is inserted. A front rope insertion portion (22) extending in the vertical direction and having a circular cross section through which the other end of the lifting rope (7) is inserted, a rear rope insertion portion (21), and a front rope insertion portion (22) And a bolt head insertion portion (23) having a T-shaped cross section in which a portion extending in the vertical direction and including the head portion (14a) of the bolt (14) is slidably fitted. The diameters of the rope insertion portions (21) and (22) are set such that the lifting rope (7) can be inserted with play.
[0016]
As shown in FIGS. 3 to 7, the wall-to-wall distance adjusting device (11) includes a fixing bracket (31) fixed to the upper end of the side tree (5) of the upper ladder (4) so as to protrude upward. A movable metal fitting (32) rotatably supported by this, an abutting member (33) attached to the movable metal fitting (32) via a square tube-shaped auxiliary metal fitting (34), and a movable metal fitting (32) And a stopper (35) for fixing the device in a use state and a storage state. As shown in the solid line in FIG. 1 and FIG. 3, the movable metal fitting (32) is rotated by the stopper (35) in a state where the movable metal fitting (32) is rotated and positioned on the extension of the side tree (4). ) Is prevented, it is possible to work in the same way as a ladder that does not have a distance adjustment device (11) with the wall, and when a larger distance between the wall and the wall is desired when working on the wall. 1 in the state where the movable metal fitting (32) is positioned between the upper end of the side tree (4) and the wall (W) by rotating the movable metal fitting (32) as shown in the chain line of FIG. 1 and FIG. The required interval can be obtained by blocking the movement of the movable metal fitting (32) by the stopper (35). When this operation is completed, the movable metal fitting (32) is rotated and returned to the state shown in the solid line in FIG. 1 and in the state shown in FIG. ) Can be handled exactly the same as a ladder that does not have.
[0017]
The fixing bracket (31) includes a rectangular tube portion (31a) fitted into the upper end portion of the side wood (4) and riveted, and left and right rising walls (31b) provided above the rectangular tube portion (31a). The left and right rising walls (31b) include a shaft insertion hole (36) penetrating the central portion in the left-right direction, and a stopper engaging notch (not shown) provided at the upper end of the arc-shaped peripheral edge. 37) and an in-use stopper engaging notch (38) provided at a forward 90 ° position.
[0018]
The movable metal fitting (32) is made of an extruded profile and has a shaft insertion hole (39) corresponding to the shaft insertion hole (36) of the fixed metal fitting (31), and the left and right rising walls (31b) of the fixed metal fitting (31). It consists of a wide part (32a) that can be pivoted in between, and a narrow part (32b) that is formed in an inverted U shape and fitted into the rectangular tube-shaped auxiliary metal fitting (34). The narrow portion (32b) includes a front and rear wall and a top wall, and a stopper support pin (40) is secured between the front and rear walls. A stopper storage hole (41) having a rectangular cross section is provided in a portion of the wide part (32a) above the shaft insertion hole (39).
[0019]
The fixed metal fitting (31) and the movable metal fitting (32) are coupled by a rivet (42) inserted through the shaft insertion holes (36) and (39) of both metal fittings (31) and (32). The shaft insertion hole (36) of the fixed metal fitting (31) is sized so that the rivet (42) can be inserted loosely, and the shaft insertion hole (39) of the movable metal fitting (32) is inserted through the rivet (42) tightly. A flat washer (43) positioned between the right rising wall (31b) of the fixed bracket (31) and the wide portion (32a) of the movable bracket (32) Is fitted.
[0020]
The abutting member (33) is made of synthetic resin, and the outer surface thereof is provided with irregularities for increasing the anti-slip effect. The contact member (33) is provided with a recess (33a) for accommodating the entire auxiliary metal fitting (34), and the auxiliary metal fitting (34) fitted in the recess (33a) is provided with the contact member. (33) and a bolt (44) passing through the auxiliary metal fitting (34) and a nut (45) screwed to the bolt (44).
[0021]
The stopper (35) is formed in a vertically long plate shape, and a protruding portion (35a) having a front-rear direction through hole (46) through which the stopper support pin (40) is inserted is formed in the left-right direction at the upper end portion thereof. It is provided so as to protrude inward. The stopper (35) is released from the stopper housing hole (41) by a torsion coil spring (47) whose both ends are wound around the stopper support pin (40) and whose center is applied to the stopper (35) from the inside. The lower end (35b) of the torsion coil spring (47) is biased from the inside by the lower end (35b) hitting the edge of the notch (37) (38) of the fixing bracket (31). Is accepted. On the outer surface of the upper and lower intermediate parts of the stopper (35), there is provided an operation part (35c) with irregularities formed.By pressing this operation part (35c), the stopper (35) and the fixing bracket (31 ) With the edges of the notches (37) and (38).
[0022]
In the state shown in FIGS. 5 and 6, the wall distance adjusting device (11) is in the retracted state, and the lower portion of the stopper (35) is in the stopper engaging notch (37) when retracted in the fixing bracket (31). The movable metal fitting (32) fitted and fitted with the stopper (35) cannot be rotated with respect to the fixed metal fitting (31). In this state, when the operation part (35c) of the stopper (35) is pushed, the lower part of the stopper (35) is disengaged from the stopper engaging notch (37) during storage, and the stopper (35) and the fixing bracket (31) Is disengaged. Holding the operation part (35c) of the stopper (35) and holding the contact member (33) and pushing it forward, the contact member (33), auxiliary metal fitting (34), movable metal fitting (32) and The stopper (35) rotates together as a unit. At this time, the stopper (35) is urged by the torsion coil spring (47) and pressed against the inner surface of the rising wall (31b) of the fixing bracket (31), and does not hinder the rotation. When the contact member (33), the auxiliary metal fitting (34), the movable metal fitting (32) and the stopper (35) rotate 90 °, the stopper (35) biased by the torsion coil spring (47) In use, the stopper engages with the notch (38), and the lower end (35b) is stopped when it hits the edge of the notch (38) from the inside. Thus, the contact member (33) is fixed in a state rotated by 90 °, and in this state, the distance from the wall (W) can be increased by using the ladder. The operation of pushing the stopper (35) and rotating the contact member (33) is very simple, so it is used (the distance from the wall (W) is large) and stored (wall (W)). Can be switched without any trouble.
[0023]
In the above embodiment, the example in which the distance adjusting device (11) with the wall is provided in the double ladder is shown, but the distance adjusting device with the wall can of course be provided in only a series of ladders. .
[Brief description of the drawings]
FIG. 1 is a side view showing a ladder according to the present invention.
FIG. 2 is an enlarged perspective view of a rope support portion.
FIG. 3 is an enlarged side view showing a wall gap adjusting device.
FIG. 4 is an enlarged side view showing an apparatus for adjusting a distance from a wall, showing a use state thereof.
FIG. 5 is a side view with a part cut away showing an apparatus for adjusting a distance from a wall;
6 is a cross-sectional view taken along line VI-VI in FIG.
FIG. 7 is an exploded perspective view of an apparatus for adjusting a distance from a wall.
[Explanation of symbols]
(4) Side wood
(31) Fixing bracket
(31a) Square tube
(31b) Left and right rising walls
(32) Movable bracket
(32a) Wide part
(32b) Narrow part
(33) Contact member
(33a) Recess
(35) Stopper
(35b) Bottom edge
(36) Shaft insertion hole
(37) Notch for stopper engagement during storage
(38) Notch for stopper engagement when in use
(39) Shaft insertion hole
(40) Stopper support pin
(41) Stopper storage hole
(47) Torsion coil spring

Claims (1)

It is equipped with a pair of left and right side trees (4), a plurality of step bars (5), and a wall distance adjustment device (11). A fixed fixture (31) that is fixed, a movable bracket (32) that is rotatably supported by the fixed bracket, a contact member (33) that is attached to the movable bracket (32) and contacts the wall, and a movable bracket ( In a ladder having a stopper (35) for fixing 32) in a used state and a stored state ,
Fixing bracket (31) is hollow side wood (4) in the fitted encased in rectangular tube portion which is fixed with (31a), the rectangular tube and the left and right rising walls provided above (31a) (31b) The left and right rising walls (31b) are separated from the shaft insertion hole (36) penetrating through the central portion thereof by a storage stopper engaging notch (37) provided at the periphery of the shaft insertion hole (36) . position when using notched stopper engaging in has a (38), the movable bracket (32), have a shaft insertion hole (39) corresponding to the shaft insertion hole (36) of the fixing bracket (31) A wide portion (32a) that is rotatably accommodated between the opposing walls (31b ) of the fixing fixture (31) , and a recess (33a) formed in an inverted U shape and provided in the contact member (33 ) It consists of a narrow part (32b) fitted inside, and a stopper support pin (40) is passed between the front and rear walls of the narrow part (32b) , and the shaft of the wide part (32b) is inserted the portion above the hole (39), contact with the stopper accommodating hole (41) is provided A stopper (35) has its upper end portion is rotatably supported on the stopper support pin (40), the torsion coil spring wound around the stopper support pins (40) (47), the stopper accommodation hole ( 41) is biased by going in a direction out, by hitting the edge of the stopper (cut at the lower end of the 35) (35b) is fixed bracket (31) away (37) (38), a torsion coil spring ( the biasing force of 47) is received, by pressing the intermediate portion of the stopper (35), the engagement between the stopper engaging notched (37) (38) edge of the stopper (35) and the fixed bracket (31) A ladder characterized by being released.

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