JP3196253U - Work stepladder - Google Patents

Abstract

An object of the present invention is to provide a working stepladder that can easily and quickly extend and contract a leg portion. A working stepladder is provided with a pair of support legs 2 that can be extended and contracted at both ends of a scaffold base plate part, both leg parts being formed of a rectangular tube, and the upper end of the base plate part. It comprises a pair of outer legs 21 that are attached on both sides of both ends, and inner legs 22 that are fitted into the outer legs and are slidable in the longitudinal direction. An engaging tooth portion 30 for locking that is serrated in the longitudinal direction is provided on the outer wall surface of each inner leg. An operation lever 31 is swingably provided on the outer wall surface of each outer leg, and a lock member 33 having a locking tooth portion 38 that engages with the engaging tooth portion is attached to the tip end portion of the lever. The lever urges the tip side toward the outer wall surface of the outer leg by the spring action of the spring, presses the lock member, engages the locking tooth with the engaging tooth, and moves the lever in the longitudinal direction of the inner leg. Lock movement. The lock is released by pressing the rear end of the lever against the spring with a finger or the like. [Selection] Figure 5

Description

  The present invention relates to a work stepladder for use in construction work sites, interior and exterior work such as ceilings and walls of buildings, electrical wiring work, and other various work. More specifically, the present invention relates to a work stepladder that can be used with its height adjusted according to the work site.

  2. Description of the Related Art Conventionally, a stepladder described in, for example, Japanese Utility Model Publication No. 61-71798 (Patent Document 1) is generally known as a working stepladder configured such that a leg portion is extendable and adjustable in height. Yes.

  In the stepladder described in Patent Document 1, the leg portion is formed in a telescopic structure in which a pair of inner and outer pipes are slidably fitted to each other in the longitudinal direction. Then, a plurality of through holes are formed in one pipe at a desired interval in the longitudinal direction, and a communication hole communicated with the through hole is formed in the other pipe. And the communication hole are in communication with each other, bolts or the like are inserted into both holes, and are tightened and fixed with nuts.

Japanese Utility Model Publication No. 61-71798

  According to the technique (prior art) described in Patent Document 1, the height of the stepladder can be adjusted to a desired height by adjusting the length of the leg. However, the prior art has the following problems.

  That is, in the prior art, when changing the length of the leg portion, the bottle or the like is extracted from the through hole and the communication hole, and then both pipes are advanced and retracted to communicate with each other. Therefore, it is difficult to align the bottles and the trouble of inserting the bottles and the like. As a result, it took a lot of time to adjust the leg length.

  The present invention has been made in view of the above circumstances, and the length of the leg portion can be easily and quickly adjusted, and the height of the work base plate portion can be fixed and locked to a desired length stably and securely. An object of the present invention is to provide a working stepladder capable of adjusting the angle.

In order to achieve the above object, one aspect of the present invention (first aspect) includes a scaffold base plate portion and a pair of extendable support legs provided opposite to both ends of the base plate portion. And a working stepladder provided with stopper means provided on the both leg portions,
The legs are
A leg main body formed with a pair of outer legs formed with a substantially rectangular tube having a lower end opening of a desired length, with the upper ends attached to both side portions at both ends of the base plate portion, An inner leg that is inserted into the outer leg and slidable in the longitudinal direction;
The stopper means includes
A desired number of engaging teeth for locking provided in a sawtooth shape in the longitudinal direction with a desired width on the outer wall surface of each inner leg;
An operating lever swingably provided on the outer wall surface of each outer leg;
A spring that constantly presses the distal end side of each lever toward the outer wall surface of the outer leg;
A locking member that engages with the engaging tooth, and a locking member attached to the tip of each lever;
Opened in a predetermined portion of each outer leg, and including an insertion hole into which the lock member can be inserted,
The lock member is pressed by the action of the spring, and the locking teeth are engaged with the engaging teeth to lock the inner leg.

  Another aspect of the present invention (second aspect) is the work stepladder according to the first aspect, wherein the base plate portion is configured to be folded in two from the substantially central portion toward the back side. It is characterized by that.

  Still another device of the present invention (third device) is the work stepladder according to the first device, wherein the supporting leg portions are provided at both ends of the base plate portion and on the back side of the base plate portion. It is provided so as to be foldable in the direction.

  According to still another aspect of the present invention (fourth aspect), the working stepladder according to the first to third aspects further includes a drop-off preventing means for preventing the inner leg from falling off from the outer legs. It is characterized by having.

According to this invention, there exist the following effects.
(1) The outer leg and the inner leg have a spring action of the locking tooth portion of the locking member attached to the tip of the operating lever provided swingably on the outer leg with respect to the engaging tooth portion provided on the inner leg. Is pressed and engaged to lock. Therefore, the outer leg and the inner leg can be locked and fixed stably and reliably at a desired position.
(2) The engagement state, that is, the lock state can be released by pressing the rear end side of the operation lever against the spring with a finger or the like against the outer wall surface side of the outer leg. Then, by releasing a finger or the like from the lever, the locking tooth portion of the locking member is engaged with the engaging tooth portion and locked. Therefore, the adjustment work of the length of the leg can be performed easily, quickly and satisfactorily.
(3) According to the second and third devices, the stepladder can be made compact by folding the base plate portion and the both leg portions. Therefore, in addition to the effects described above, the storage space for the stepladder can be reduced, and transportation and other handling operations are simplified.
(4) According to the fourth device, in addition to the effects described above, it is possible to prevent the inner leg from inadvertently falling off the outer leg.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematically the structure of the working stepladder of one Embodiment of this invention, Comprising: The figure (a) is an explanatory front view, The figure (b) is an explanatory plan view, The figure (c) is an explanatory side view FIG. It is a figure which expands a part of base plate part for scaffolds of the said stepladder, and is a figure which shows the structure schematically, Comprising: The figure (a) is an explanatory front view, The figure (b) is A of the figure (a). FIG. 4C is an explanatory cross-sectional view showing a part of the structure cut along line -A, and FIG. 4C is an explanatory front view showing a state in which the base plate portion is folded. It is explanatory front view which expands the leg part side for one support of the said stepladder, and shows the structure roughly. It is a figure which expands a part of one said leg part side of the said stepladder, and is a figure which shows the structure schematically, Comprising: The same figure (a) is an explanatory front view, The same figure (b) is one end of the said baseplate part. The explanatory front view which shows the part side and the figure (c) are explanatory front views which show the state which folded the said leg part. It is a figure which expands a part of one said leg part of the said stepladder, and shows the structure schematically, Comprising: The figure (a) is an explanatory longitudinal cross-sectional view, The figure (b) is the figure (a) of the figure. An explanatory left side view and FIG. 10C are explanatory side views showing a structure of a lever holder that supports and attaches an operation lever so as to be swingable. FIG. 5 is an explanatory longitudinal cross-sectional view schematically showing a configuration of an enlarged portion of the leg portion where stopper means is attached. FIG. 7A is a cross-sectional view taken along line BB in FIG. 5A, and FIG. 7B is a schematic view of a configuration of a fitting cylinder for preventing falling off that is fitted to the lower end of the leg portion. FIG. It is explanatory front view which shows the state which folded the stepladder.

  Hereinafter, an example of an embodiment of a working stepladder according to the present invention will be described with reference to the drawings.

  1 to 8 show a working stepladder according to an embodiment of the present invention.

  As shown in FIG. 1 to FIG. 8, the working stepladder according to the present embodiment includes a scaffold base plate 1 and a pair of extendable support legs provided opposite to both ends of the base plate 1. 2, 2, stopper means 3, 3 provided on both legs 2, 2, and drop-off prevention means 4.

  The said base plate part 1 is formed in the substantially rectangular shape of the desired width | variety, length, and thickness with the board | plate material which consists of an aluminum alloy other lightweight and robust raw material, for example. The width, length, and thickness of the base plate portion are not particularly limited. For example, the width: about 30 cm to about 50 cm, the length: about 1 m to about 3 m, and the thickness: about 3 cm to about 5 cm. Can do. However, the present invention is not limited to the above range.

  The base plate portion 1 of the present embodiment is configured to be foldable in half from the substantially central portion toward the back surface side. The base plate portion 1 of the present embodiment is configured by connecting a pair of scaffolding plates 10a and 10b formed in substantially the same dimensions with a joint so as to be foldable in a predetermined direction.

  Specifically, joint brackets 11a, 11a and 11b, 11b are fixed on both sides of one end of both scaffold plates 10a, 10b with rivets 12 ... 12 or the like. Both the brackets 11a and 11b are formed so as to overlap each other and have a common insertion hole (reference numeral omitted) for inserting the rivet 13 and the like into the overlapping portion of both the brackets 11a and 11b. Then, a rivet or the like is inserted into the insertion hole in a state where the end surfaces of the two scaffolding plates are in contact (joined), and the brackets 11a and 11b are pivotally fastened and connected to each other with the rivet or the like as a pivot. It is.

  As described above, the base plate portion 1 is configured to be folded in half from the substantially central portion toward the back surface side. Further, by opening the base plate portion from the folded state, when the both scaffold plates 10a and 10b become substantially horizontal (substantially flat), the front end surfaces of both scaffold plates are pressed and locked. Has been.

  Further, in the present embodiment, a hook-shaped fastening provided so that the base portion is pivotally attached by rivets or the like 14 to be in contact with the outer wall surfaces of both brackets 11a on both side portions on the distal end side of one scaffold plate 10a. Engagement shafts 16 that are provided to protrude from the outer wall surface of the bracket 11b on both sides of the metal fitting 15 and the tip side of the other scaffolding plate 10b and engage the tip portion (hook portion) of the hook-shaped fastener 15. With. Then, with the base plate portion 1 opened and the distal end surfaces of the two scaffold plates 10a and 10b in contact, the hook portions at the distal ends of the fasteners 15 are engaged with the engagement shafts 16 to fix the two scaffold plates. It is comprised so that the movement to the inner side direction of a field board may be stopped (locked). When the base plate 1 is folded, the engagement of the fasteners is released.

  In addition, the said structure as a means to fold a baseplate part was disclosed as an example, and is not limited to the structure of illustration, It can change into hinge-type or other arbitrary structures.

  The leg portions 2, 2 are opposed to each other at a predetermined interval, and a leg portion body 20 having a pair of outer legs 21, 21 that are attached to both side portions at both ends of the base plate portion 1, and each outer leg 21. And inner legs 22 and 22 provided so as to be slidable in the longitudinal direction.

  The both leg part main bodies 20 of this embodiment are formed in a substantially ladder shape by laying a desired number of horizontal bars 23... 23 on both outer legs 21 and 21. The horizontal rail 23 can be used as a step rail when ascending to the base plate portion 1 and also serves as a reinforcement for both outer legs 21.

  Each of the outer legs 21 is formed of, for example, an aluminum alloy or other metal material or the like and a substantially rectangular tube body having a desired length and a lower end opening. Each said outer leg 21 is formed in substantially the same length. Although the length of each outer leg 21 is not specifically limited, For example, it can form in about 80 cm-about 150 cm. However, it is not limited to the above range.

  Each of the inner legs 22 is formed of a tube having a desired length having a substantially square cross section corresponding to the inner wall surface of the outer leg 21. Each inner leg 22 is provided so as to be slidable (slidable) in the longitudinal direction by being inserted into the outer leg from the opening lower end side of the outer leg 21. As described above, the inner leg is slid (slid) in the longitudinal direction with respect to the outer leg, so that the leg 2 can be expanded and contracted to adjust the length of the leg.

  Although the length of each inner leg 22 is not specifically limited, For example, it can form in about 50 cm-about 120 cm. However, the present invention is not limited to the above range. An installation base 24 is fixed to the lower end of each inner leg 22.

  The supporting leg portions 2 are provided so as to be foldable in the direction of the back surface of the base plate portion 1.

  In this embodiment, as shown in detail in FIG. 4 and the like, the base plate portion 1 is provided so as to be opposed to the lower surface (back surface) on both side portions near both ends (and therefore near the outer ends of both scaffold plates). Brackets 25a and 25b for one joint are provided. Further, brackets 25c and 25d for the other joints are provided so as to protrude from the inner outer wall surface at the upper end of each outer leg 21 and are formed so as to overlap with the brackets 25a and 25b, respectively.

  Both the brackets 25a, 25b and 25c, 25d are provided with a common insertion hole (reference numeral is omitted) for inserting the rivet 26 and the like into the overlapping portion. Then, a rivet or the like is inserted into the insertion hole in a state where the upper end surface of each outer leg 21 is in contact (joined) with the lower surface (back surface) of the base plate portion 1, and each outer leg 21 is rotated around the rivet or the like as a pivot. Each outer leg is attached to the base plate part by movably fastening with rivets or the like.

  By the above, both the leg parts 2 are comprised so that folding in the back surface side direction of the baseplate part 1 is possible. Further, by opening both the leg portions 2 from the folded state, the upper end surface of each outer leg is in contact with the back surface (lower surface) of the base plate portion, and further movement is restricted and locked. It is comprised so that 1 may be supported and a stepladder may be stood up and installed.

  Further, in the present embodiment, hook-like fasteners 28 provided with base portions rotatably attached by rivets 27 or the like on both side portions near both end portions of the base plate portion 1 and the respective fasteners 28 are associated with each other. An engagement shaft 29 is provided that protrudes from the outer wall surface on the side surface of each outer leg and engages the hook portion at the tip of the hook-shaped fastener 28. Then, the both leg portions 2 are opened, and the outer leg is fixed by engaging the hook portion at the tip of the fastener 15 with the engagement shaft 29 in a state where the upper end surface is in contact with the back surface of the base plate portion 1. It is comprised so that the movement to the inner side direction may be stopped (locked). In addition, when folding both the leg parts 2, the said engagement of a fastener is cancelled | released.

  In addition, the said structure as a means to attach and provide both the leg parts 2 to a baseplate part so that folding is possible is disclosed as an example, and it can change into arbitrary structures other than illustration other than hinge type.

  The stopper means 3 is provided on the outer wall surface of each outer leg 21 and the engaging tooth portion 30 for locking provided on the outer wall surface of each inner leg 22, as shown in detail in FIGS. An operation lever 31, a spring 32 that constantly presses the distal end side of each lever 31 toward the outer wall surface of the outer leg, a lock member 33 that is attached to the distal end side of each lever 31, and a predetermined portion of each outer leg And an insertion hole 34 into which the lock member 33 can be inserted.

  A desired number of the engaging tooth portions 30 are provided on the outer wall surface of each inner leg 22 in a sawtooth shape in the longitudinal direction of the inner leg 22 with a desired width. That is, the engagement tooth part 30 is provided in the longitudinal direction of the inner leg 22 in the form of, for example, an uneven strip of a washing board. The width of the engaging tooth portion 30 is not particularly limited, but can be formed, for example, in a range of about 1/2 to about 2/3 of the width of the inner leg 22. In the present embodiment, an example in which the width is about 2/3 of the width of the inner leg 22 is disclosed. In this case, the width can be arbitrarily changed.

  The operation lever 31 is swingably provided on the outer wall surface of each outer leg 21. In the present embodiment, a lever holder 35 formed in a substantially U shape is provided by providing a pair of bearing plates 35b, 35b on both ends of the base plate 35a, and the holder 35 is screwed to the outer wall surface of each outer leg 21. It is fixed by other means. Both the bearing plates 35b are provided with bearing holes 35c, 35c provided to face each other. Both the holes 35c are formed as laterally elongated holes.

  Each lever 31 is provided with the intermediate portion mounted on a shaft 36. The shaft 36 is supported by inserting both ends into the holes 35c of the bearing plate 35b. Thereby, the lever 31 is provided so as to be able to swing around the shaft 36 as a fulcrum.

  The lever 31 is always pressed by the spring action of the spring 32 to urge the tip side toward the outer wall surface of the outer leg 21. In the present embodiment, a coil spring is employed as the spring 32.

  Each lock member 33 is provided by being attached to the tip of each lever 31 via an attachment member 37. As a result, each lock member 33 is configured so as to pass through the insertion hole 34 and be always pressed against the outer wall surface of the inner leg 22 by the spring action of the spring 32 to be elastically in pressure contact.

  A desired number of locking teeth 38 that engage with the engaging teeth 30 are provided on the inner surface of each lock member 33, that is, the inner leg surface. As a result, the locking tooth portion 38 of the locking member is pressed by the action of the spring 32 to engage and lock the engaging tooth portion 30, and the movement of the inner leg 22 in the longitudinal direction is restrained. .

  Further, by operating the rear end side of the lever 31 with a finger or the like and pressing it against the spring 32 against the outer wall surface side of the outer leg 21, the engaged state of the tooth portions 30 and 38, that is, the lock Since the state is released, each inner leg 22 can be slid (slid) in the longitudinal direction with respect to the outer leg 21. Then, by releasing a finger or the like from the lever, the lock member is pressed, and the locking tooth portion of the lock member is re-engaged with the engagement tooth portion to lock and fix the inner leg. Therefore, the leg length adjustment work can be easily and quickly performed with the above configuration.

  The drop-off prevention means 4 is a means for preventing the inner legs 22 from dropping from the outer legs 21.

  The drop-off prevention means 4 of the present embodiment is provided on the outer wall surface of each inner leg 22 by fitting with a recess 40 having a desired width and length provided in the longitudinal direction and the lower end of each outer leg 21. And a fitting cylinder 41 for preventing dropout.

  The concave portion 40 of the present embodiment is provided on the outer wall surface of each inner leg 22 on the side facing the engaging tooth portion 30. The recess 40 can be formed to a desired depth and width. Moreover, the length of the recessed part 40 can also be formed in desired length.

  The width of the recess 40 of this embodiment is formed to be approximately the same as the width of the engagement tooth portion 30. Further, the recess 40 is formed to have a length from the lower end portion of the inner leg 22 to the vicinity of the upper end portion of the inner leg 22, and the upper end of the recess 40 is engaged with an engagement protrusion described later of the fitting cylinder 41. An engagement surface 42 for preventing the falling off is formed.

  The fitting cylinder 41 is formed of a rubber material or other elastic material, and is configured by a substantially rectangular cylinder that fits and fits to the lower end portion of the outer leg 21. As shown in FIG. 7 and the like, the tubular body 41 is provided in the bottom wall portion 43 of the tubular body 41 and corresponds to the fitting hole 44 that fits and fits to the lower end portion of the inner leg 22 and the recessed portion 40. And an engaging convex portion 45 engaging with the engaging surface 42 provided at the upper end of the concave portion 40.

  With the above-described configuration, the inner leg 22 can move in the longitudinal direction in the outer leg 21, and the engaging surface 42 engages with the engaging convex portion 45, thereby further sliding downward. It is configured to regulate. Accordingly, the inner leg 22 is configured to be prevented from falling off the outer leg 21.

  The work stepladder of the present embodiment is configured as described above, and is used as a stepladder for various works as in the prior art.

  The above embodiment is disclosed as an example, and the present invention is not limited to the above embodiment, and can be arbitrarily changed without departing from the technical idea described in the claims of the utility model registration. It is a thing.

DESCRIPTION OF SYMBOLS 1 Base plate part 2 for scaffolds 2, 2 Leg part 3 for support Stopper means 21 Outer leg 22 Inner leg 30 Engagement tooth part 31 Operation lever 32 Spring 33 Lock member 38 Lock tooth part

Claims (4)

A working stepladder comprising a scaffold base plate, a pair of extendable support legs provided opposite to both ends of the base plate, and stopper means provided on both legs,
The legs are
A leg main body formed with a pair of outer legs formed with a substantially rectangular tube having a lower end opening of a desired length, with the upper ends attached to both side portions at both ends of the base plate portion, An inner leg that is inserted into the outer leg and slidable in the longitudinal direction;
The stopper means includes
A desired number of engaging teeth for locking provided in a sawtooth shape in the longitudinal direction with a desired width on the outer wall surface of each inner leg;
An operating lever swingably provided on the outer wall surface of each outer leg;
A spring that constantly presses the distal end side of each lever toward the outer wall surface of the outer leg;
A locking member that engages with the engaging tooth, and a locking member attached to the tip of each lever;
Opened in a predetermined portion of each outer leg, and including an insertion hole into which the lock member can be inserted,
A working stepladder configured to lock the inner leg by pressing the lock members by the action of the spring to engage the locking teeth with the engaging teeth.   2. The work stepladder according to claim 1, wherein the base plate portion is configured to be folded in half from a substantially central portion toward a back surface side direction.   2. The work stepladder according to claim 1, wherein the supporting leg portions are provided at both ends of the base plate portion so as to be foldable in a direction toward the back side of the base plate portion.   The work stepladder according to any one of claims 1 to 3, further comprising drop-off prevention means for preventing the inner legs from falling off the outer legs.

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