JPH08752U - Step fixing device for stepladder - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To prevent generation of noise by eliminating rattling of a tension member. SOLUTION: Two ladder bodies 5 that are connected so that they can be freely opened and closed.
One of the first and second ladder bodies 52 has a tension member 2 whose one end is rotatably attached, the other ladder body 51 is provided with an engagement pin 56, and the other end of the tension member 2 is provided. A downwardly open notch 21 is provided at the lower end, a lock member 22 for locking the engagement between the engagement pin 56 and the notch 21 is provided for unlocking operation, and a large diameter portion 56a is formed at the projecting end of the engagement pin 56. When the notch 21 of the tension member 2 is engaged with the lower portion of the lock member 22 from above from the engagement pin 56, the lock member 22
A cam portion that abuts the large-diameter portion 56a is formed so as to open in the unlocking direction, and the engaging pin 56 is pressed and urged by the lock member 22 to separate the tension member 2 from the ladder body 51.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to an open leg fixing device for a stepladder.

[0002]

[Prior art]

 As is well known, the stepladder is composed of two ladder bodies connected so that they can freely move in a butterfly manner.The ladder bodies are folded in two when stored or carried, and when used, the ladder bodies are made to fold open to allow them to stand by themselves. Or, they are deployed in a straight line and lean against a building.

This stepladder is provided with an open leg fixing device for fixing the state in which the ladder bodies are in the crotch-opening state. This spread leg fixing device fixes the spread leg angle of both ladder bodies by bridging a slender plate-shaped tension member between the side surfaces of the ladder bodies. The tension member is provided with a pivotal support portion at one end side thereof, and is attached to the pivotal support pin provided on the side surface of one of the ladder bodies in a rotatable and detachable state by this pivotal support portion. . Further, a hook mechanism is provided on the other end side of the tension member, and the hook mechanism can be engaged with or disengaged from an engaging projection provided on the side surface of the other ladder body. (See, for example, Japanese Utility Model Publication No. 3-557858).

[0004]

[Problems to be solved by the device]

 However, since the pivot part was attached to the pivot pin with play (particularly along the axial direction of the pivot pin), the other end of the tension member was hooked on the engaging protrusion. Every time the stepladder was moved in this state, the other end of the tension member collided with the ladder body, causing a rattling noise and annoying noise, which was noisy. For example, also in the one disclosed in Japanese Utility Model Publication No. 3-55758, the other end of the tension member reciprocates between the large-diameter portion formed at the protruding end of the engaging projection and the ladder body. Vibration and noise are generated.

Further, in the technique disclosed in Japanese Utility Model Publication No. 3-55758, in order to engage the other end of the tension member with the engagement protrusion, the tension member is first rotated. By doing so, the engagement hole provided at the other end of the tension member is aligned with the engagement protrusion by visual inspection, and then the tension member is pushed in to insert the engagement protrusion into the engagement hole. It is necessary to slightly rotate it, and such operation is complicated and quick work cannot be done.Because of this structure, the other end of the tension member is pulled out toward the tip of the engaging projection. There is a problem that the play necessary for the above must be provided in the pivotal part, and the play will increase the rattling.

The present invention has been made in view of the above circumstances, and reduces the vibration of the tension member when moving the stepladder so that the other end of the tension member functions as a ladder. A stepladder that prevents noise from being generated due to collision and that can easily and quickly engage the other end of the tension member with the engaging protrusion of the ladder body. The object is to provide a spread leg fixing device.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention takes the following technical means. That is, the present invention has a tension member whose one end is rotatably attached to one of the two ladder bodies that can be freely opened and closed, and has an engaging projection on the other ladder body. Is provided, an engaged portion to which the engaging projection is removably engaged is provided at the other end of the tension member, and the engaging projection engages with the engaged projection. Is provided between the tension member and the vibration isolator so as to press the projection end of the engagement projection toward the ladder body. It is characterized by being urged by an urging means interposed.

Furthermore, according to the present invention, the engaging projection is pin-shaped and has a large diameter portion at its projecting end, and the engaged portion penetrates the front and back of the tension member and opens downward. The notch is formed so that it can be engaged with the engagement protrusion from above, and the large diameter portion of the engagement protrusion engaged with the engaged portion abuts on the surface of the tension member. The other end of the tension member is prevented from coming off in the protruding end direction of the engaging protrusion, and the engaged portion of the tension member is engaged with the lower portion of the vibration-proof member against the engaging protrusion from above. At the same time, a cam portion is formed that abuts the large-diameter portion so as to open in a direction in which the vibration-damping member is separated from the tension member, and the cam portion is formed of the engaging projection engaged with the engaged portion. It is characterized in that it is designed as a downward retaining portion.

According to the present invention, when the engaged portion provided at the other end of the stretching member is engaged with the engaging protrusion of the ladder body, the stretching structure is provided. By biasing the anti-vibration member by the biasing means interposed between the member and the anti-vibration member, the projecting end of the engaging projection is pressed toward the ladder body side. The tension member itself is urged from the engaging projection in the direction away from the ladder body along the projecting direction. As a result, the other end of the tension member is prevented from vibrating or hitting the ladder body, and rattling or noise is prevented.

Further, the present invention has a tension member whose one end is rotatably attached to one of the two ladder bodies which are freely connected to each other so that the other ladder body is connected to the other ladder body. An engaging pin is provided, and at the other end of the tension member, a notch is formed so as to penetrate the front and back of the tension member and open downward, so that the engagement pin can be engaged from above. Is provided, and a lock member that prevents the engaging pin from coming off from the notch when the engaging pin engages with the notch is provided so as to be unlockable, and the protruding end of the engaging pin is provided. Has a large-diameter portion that comes into contact with the surface of the tension member to prevent the other end of the tension member from coming off in the protruding direction of the engagement pin. The lock member when the notch of the tension member is engaged from above. It is characterized in that a cam portion that comes into contact with the large diameter portion is formed so as to open in the unlocking direction.

According to the present invention, by having such a characteristic configuration, when the tension member is lowered from the upper side toward the engagement protrusion (engagement pin) provided on the ladder body, the engagement is performed. When the lower cam portion of the vibration-proof member (lock member) comes into contact with the large-diameter portion of the protrusion, the vibration-proof member (lock member) is opened so as to be separated from the tension member (that is, the lock member). It is opened in the unlocking direction). When the tension member is further lowered, the engagement protrusion engages with the engaged portion (notch) provided at the other end of the tension member, and the engagement state is changed by the vibration isolating member (lock member). It is held so that it can be released. In this way, the other end can be locked and locked on the ladder by simply lowering the tension member, so that the work can be performed easily and quickly, and such a lock structure can be configured simply. be able to.

[0012]

[Embodiment of device]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the open leg fixing device 1 according to the present embodiment is configured such that when two ladder bodies 51 and 52, which are connected to each other by a stepladder 50 so as to be able to open and close the legs, are at least crotch-opened, the side surfaces of these ladder bodies are mutually separated. It comprises a tension member 2 used for bridging between, and a pivotal support portion 3 is provided at one end of the tension member 2 and a hook mechanism 20 is provided at the other end. ing. The basic structure itself is almost the same as the conventional one. Further, the tension member 2 is formed in a slender plate shape using a metal plate or the like, and the pivot support portion 3 is formed as a hole penetrating the front and back surfaces of the tension member 2. On the other hand, by inserting the pivot pin 55 having the large diameter portion 55a (see FIG. 2A) at the projecting end portion and attaching it to the side surface of the one ladder body 52, the tension member 2 In that the hook mechanism 20 is held so as to be rotatable and non-removable, the hook mechanism 20 can be engaged with and disengaged from the engaging projection 56 (see FIG. 8) attached to the side surface of the other ladder body 51 (see FIG. 8). The details will be described later), etc., and are similar to the conventional ones.

In the tension member 2 of the present invention, as shown in FIG. 2, at the end portion on the side where the pivotal support portion 3 is provided, the vibration damping is performed so as to face the side surface of the ladder body 52 facing the end portion. Tool 5 is provided. The vibration isolator 5 is made of an elastic material (for example, a polyethylene-based, silicon-based resin material, rubber, or the like), and has a truncated cone-shaped main body portion 6, and A flange portion 8 is provided so as to project from the main body portion 6 through a constricted portion 7. A pin insertion hole 10 is formed so as to penetrate the main body portion 6, the constricted portion 7 and the central portion of the flange portion 8. Has been formed. A rib 9 that is slightly shorter than the dimension of the body portion 6 in the thickness direction is provided around the opening of the pin insertion hole 10 in the body portion 6.

When the material for forming the vibration isolator 5 is soft enough to be deformed with a fingertip, the vibration isolator 5 can be attached to the tension member 2 as follows. That is, while the flange portion 8 is deformed in such a manner that the flange portion 8 is crushed in the radial direction, the flange portion 8 is pushed into the pivotal support portion 3 from the back side of the tension member 2, and the constricted portion 7 reaches the pivotal support portion 3. At this time, the deformation of the flange portion 8 is released, and the tension member 2 is held between the flange portion 8 and the main body portion 6. On the other hand, when the forming material of the vibration isolator 5 is hard enough to be hardly deformed by the fingertip, the following is performed. That is, the flange portion 8 is left unformed (only the constricted portion 7 projects from the main body portion 6 by a length approximately twice its completed size), and the constricted portion 7 is stretched. Insert it from the back side of 2 into its pivotal support 3. Then, of the constricted portion 7, heat is applied to the portion of the constricted portion 3 protruding to the front side so that the portion is crushed to the opening peripheral portion of the pivoted portion 3 or the entire periphery thereof is bent outward. By forming the flange portion 8 with the above, the tension member 2 is sandwiched between the flange portion 8 and the main body portion 6. To attach the tension member 2 with the vibration isolator 5 to the ladder body 52, first insert the pivot pin 55 (before attaching to the ladder body 52) into the pin insertion hole 10 of the vibration isolator 5. The pivot pin 55 is attached to the side surface of the ladder body 52.

The tension member 2 attached to the ladder body 52 in this manner is urged by the vibration isolator 5 such that the end portion on the pivotal support 3 side is always separated from the side surface of the ladder body 52. The opening peripheral portion of the pivotal support portion 3 (the flange portion 8 of the vibration isolator 5 in this embodiment) is pressed against the retaining large diameter portion 55a of the pivotal support pin 55, and the pivotal support portion 3 and the pivotal support pin 55. There is no play in the axial direction of the pivot pin 55 between and. Therefore, when the stepladder 50 is moved, the tension member 2 does not rattle and noise does not occur. This is the same regardless of the orientation of the tension member 2 about the pivot pin 55. Therefore, as shown in FIG. 1, not only when the ladder bodies 51 and 52 are in the crotch-opened state, but also when the ladder bodies 51 and 52 are folded in two or in a straight line, or at a stage in the middle of reaching them. Even if there is, rattling, that is, noise does not occur. The vibration isolator 5 is formed so that the rib 9 in the main body portion 6 does not come into contact with the side surface of the ladder body 52. The play can be forcibly formed between the support pin 55 and the support pin 55. Therefore, when the hook mechanism 20 of the tension member 2 is hooked on or removed from the engaging protrusions 56 to 58 or the like provided on the ladder bodies 51, 52, the hook mechanism 20 of the tension member 2 is used. Since it can be reasonably swung in the direction away from the ladder body 51, no trouble occurs.

The shape and structure of the vibration isolator 5 can be variously changed, and the main body portion 6 can be solid as shown in FIGS. 3 and 4. Note that the vibration isolator 5 shown in FIG. 3 does not have the constricted portion 7 and the flange portion 8 used for mounting on the tension member 2. Therefore, in order to facilitate the assembly work instead of these, the structure is provided with a dowel 11, and the tension member 2 also has a hole (not shown) for receiving the dowel 11 in the peripheral portion of the pivot portion 3. Was formed. Alternatively, the vibration isolator 5 may be attached to the tension member 2 using an adhesive, or even if no means for attachment is used. The vibration isolator 5 is not limited to the one using the elastic force of the material itself, and is a mechanical one in which the coil spring 13 is sandwiched between two seat members 12 as shown in FIG. You can also

By the way, in holding the tension member 2 rotatably with respect to the side surface of the ladder body 52, unlike the above-described embodiment, a pivot pin 55 is integrally provided on the pivot portion 3 side. In some cases, a hole for fitting the pivot pin 55 may be formed on the side surface of the ladder body 52. Also in this case, the vibration isolator 5 may be provided between the pivotal support portion 3 of the tension member 2 and the side surface of the ladder body 52. Next, the hook mechanism 20 of the tension member 2 will be described. As shown in FIGS. 6 and 7, the hook mechanism 20 covers the front side of a notch 21 (engaged part) formed so as to penetrate the front and back of the tension member 2 and open downward. As described above, the plate-shaped lock member 22 (anti-vibration member) is attached. The upper end of the lock member 22 is fitted to the stepped pin 31 so as to be suspended and held by the tension member 2, and the lock member 22 is inserted into the stepped pin 31 and stretched. A spring 30 (biasing means) interposed between the vibration isolating member 22 and the vibration isolating member 22 presses and biases the surface of the tension member 2. The lock member 22 is formed with a central hole 23 penetrating through the front and back surfaces of the plate surface so as to match the notch 21. The lower part of the opening peripheral part of the central hole 23 has the upper end part in the notch 21. Is slightly slid in and the lower end is inclined so as to separate from the tension member 2. The upper half of the central hole 23 is covered with a vibration-proof cover 24 that bulges in a dome shape toward the front side.

With the hook mechanism 20 having such a configuration, as shown in FIG. 8, an engaging projection 56 (a pin-like one having a large diameter portion 56a at the projecting end is provided on the side surface of the ladder body 51. ), The tension member 2 is lowered from the upper side, and when the lower inclined portion (cam portion) of the lock member 22 comes into contact with the large diameter portion 56a of the engagement projection 56, the lock member 2 22 is opened so as to be separated from the tension member 2 against the spring 30. When this state is further advanced, as shown in FIG. 9, the central hole 23 of the lock member 22 is fitted into the large diameter portion 56a of the engaging protrusion 56, and as a result, the lock member 22 is again attached to the tension member 2. It is closed so as to come into contact with the surface, this state is biased and held by the spring 30, and the engagement projection 56 engaged with the engaged portion 21 by the lower cam portion of the lock member 22 is pulled out downward. Is blocked. The urging force of the spring 30 at this time acts so that the vibration-proof cover 24 of the lock member 22 presses and urges the large-diameter portion 56a of the engaging projection 56 toward the surface side of the tension member 2. As a reaction, the tension member 2 as a whole receives a biasing force in a direction away from the side surface of the ladder body 51. Thus, the tension member 2 is held in a state where there is no play in the axial direction with respect to the engaging projection 56, and rattling, that is, noise is not generated even when the stepladder 50 is moved.

In order to release the engagement of the hook mechanism 20 with the engagement protrusion 56, the tension member 2 is rotated upward while the lower inclined portion of the lock plate 22 is opened toward the front side. do it.

[0020]

[Effect of device]

 The present invention has the above-mentioned structure, and when the engaging protrusion of the ladder body is engaged with the engaged portion provided at the other end of the tension member, the vibration isolating member engages with the engaging protrusion. Since the other end of the tension member can be held in a state of being separated from the ladder body by the reaction of pressing, it is possible to prevent rattling and the above-mentioned noise at the other end of the tension member. Since the vibration-proof member presses the tip end of the engaging projection, the other end of the tension member can be reliably separated from the ladder body even with the biasing means having a relatively small biasing force. As a result, an unreasonable force due to the urging force of the urging means does not act on each part, so that the durability is improved, and the urging means and anti-vibration member hinder the engagement between the engaging projection and the engaged part. It is possible to facilitate the engaging operation.

Further, according to the present invention, by simply lowering the tension member, the engagement projection (the engagement pin) is formed on the lower open engagement portion (notch) provided at the other end of the tension member. ) Can be engaged and the engaged state can be locked, so that the suspension operation of the tension member can be performed easily and quickly, and the lock member and the vibration isolating member can be combined into one member. It is possible to reduce the number of components and the cost by sharing it with each other, and since it is not necessary to provide a play at the pivotal support portion at one end of the tension member, rattling and noise at the other end of the tension member can be prevented. Can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a stepladder in which an open leg fixing device according to the present invention is implemented.

2 (a) is an enlarged cross-sectional view taken along the line AA of FIG.
(B) is a perspective view which extracts and shows only a vibration isolator.

FIG. 3 is a perspective view showing a second embodiment of a vibration isolator.

FIG. 4 is a partially cutaway perspective view showing a third embodiment of a vibration isolator.

FIG. 5 is a cross-sectional view showing a fourth embodiment of a vibration isolator.

FIG. 6 is an enlarged view of part B in FIG.

7 is a cross-sectional view taken along line CC of FIG.

FIG. 8 is a cross-sectional view showing a state in which the hook mechanism engages with the engagement protrusion.

FIG. 9 is a cross-sectional view showing a state after engagement of the hook mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Opening leg fixing device 2 Stretching member 21 Engaged part 22 Anti-vibration member (lock member) 30 Energizing means 50 Stepladder 51 Ladder body 52 Ladder body 56 Engagement projection (engagement pin) 56a Large diameter part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shigehiko Koishikawa, 4-170 Tanaka Co., Ltd., Higashi-Osaka City, Osaka Prefecture (72) Inventor, Rei Nagashima 4-170, Tanaka, Higashi-Osaka City, Osaka Prefecture, Pika Corporation

Claims (3)

[Scope of utility model registration request] 1. A ladder member (2) having one end rotatably attached to one ladder body (52) of two ladder bodies (51, 52) which are connected so that they can be freely opened and closed. An engaging projection (56) is provided on the other ladder body (51), and the engaging projection (56) is detachably engaged with the other end of the tension member (2). The vibration-proof member (22) is provided with a mating portion (21) and comes into contact with the projecting end portion of the engaging projection (56) when the engaging projection (56) is engaged with the engaged portion (21). Is provided, and the anti-vibration member (2
2) is a tension member (2) and a vibration isolator (2) for pressing the tip end of the engagement protrusion (56) toward the ladder body (51) side.
An open leg fixing device for a stepladder, characterized in that it is urged by an urging means (30) interposed between and. 2. The engagement projection (56) is in the shape of a pin and has a large diameter portion (56a) at its projecting end portion, and the engaged portion (2).
Reference numeral 1) is a notch formed so as to penetrate the front and back of the tension member (2) and open downward, and is engageable from above with the engagement protrusion (56). The large diameter portion (56) of the engaging protrusion (56) engaged with the joint portion (21).
The contact of (a) with the surface of the tension member (2) prevents the other end of the tension member (2) from slipping out toward the tip of the engaging protrusion (56), and the vibration damping member (22). In the lower part of the engaging projection (56), the engaged part (2
A cam portion is formed which abuts against the large diameter portion (56a) so as to open the vibration isolating member (22) in a direction of separating it from the tension member (2) when engaging 1) from above. Engaging projection (56) whose part is engaged with the engaged part (21)
The open leg fixing device for a stepladder according to claim 1, wherein the device is formed as a retaining portion for the downward direction of the step. 3. A ladder member (2) having one end rotatably attached to one ladder body (52) of two ladder bodies (51, 52) which are connected so that they can be freely opened and closed. An engaging pin (56) is provided on the other ladder body (51) so that the other end of the tension member (2) penetrates the front and back of the tension member (2) and opens downward. A notch (21) which is formed on the engaging pin (56) and can engage with the engaging pin (56) from above, and the notch (21).
When the engagement pin (56) is engaged with the engagement pin (5
A lock member (22) for preventing the 6) from coming off from the notch (21) is provided so as to be unlockable, and the projection of the engaging pin (56) is provided on the surface of the tension member (2). A large-diameter portion (56a) that abuts and prevents the other end of the tension member (2) from coming off in the protruding direction of the engagement pin (56).
And the lock member (22) is unlocked when the notch (21) of the tension member (2) is engaged with the engaging pin (56) from above from below the lock member (22). An open leg fixing device for a stepladder, characterized in that a cam portion that abuts against the large diameter portion (56a) is formed so as to open in the direction.