JP4025782B2 - Telescopic leg - Google Patents

Description

  The present invention relates to a telescopic leg used for a tripod-stand bar-shaped telescopic leg having a three-point support structure or an outrigger telescopic leg in a mobile scaffold.

  Known literatures such as patent gazettes cannot be specifically cited as conventional telescopic legs, but the conventional telescopic legs are slidable into a cylindrical small diameter leg member and this small cylindrical diameter leg member. It consists of a cylindrical large leg member fitted externally, and a fixing pin for fixing the small leg member to the large leg member at a position where the small diameter leg member is extended or contracted by a required length with respect to the large leg member. A pin insertion hole penetrating in the diametrical direction is provided at one end of one end of the leg member, and a plurality of pin insertion holes penetrating in the diametrical direction are provided in the small diameter leg member at a constant pitch in the axial direction. By inserting a fixing pin from the pin insertion hole into the pin insertion hole of the small-diameter leg member, the small-diameter leg member is fixed to a position extended and contracted by a required length with respect to the large-diameter leg member.

  In the conventional telescopic legs, the cylindrical small-diameter leg member and the large-diameter leg member rotate with each other. It takes time to insert the fixing pin from the pin insertion hole of the large-diameter leg member into the required pin insertion hole of the small-diameter leg member. Therefore, the present invention provides a fixing pin that is a pin of the large-diameter leg member at a position where the small-diameter leg member and the large-diameter leg member are extended by a required length with respect to the large-diameter leg member without rotating the small-diameter leg member and the large-diameter leg member. An object of the present invention is to provide an extendable leg that can be easily and easily inserted from a through hole into a required pin insertion hole of a small-diameter leg member.

Means for solving the above problems will be described with reference numerals of the embodiments described later. The invention according to claim 1 is a cylinder in which a concave groove 8 is formed over the entire length on one side of the outer peripheral surface. Or columnar small leg member 5, a cylindrical large leg member 6 that is slidably fitted on the small leg member 5, and a small diameter leg member 5 with respect to the large diameter leg member 6. in elevator foot 2 consists of a fixed pin 7 for for fixing the large diameter leg member 6 at a position obtained by,
The large-diameter leg member 6 is provided with a pin insertion hole 9 penetrating in the diametrical direction at one end, and the small-diameter leg member 5 includes a plurality of pin insertion holes 10 penetrating in the diametrical direction from the concave groove 8 at a constant pitch in the axial direction. When the small-diameter leg member 5 is expanded and contracted with respect to the large-diameter leg member 6, the tip of the fixing pin 7 is once inserted into the concave groove 8 from the pin insertion hole 9 of the large-diameter leg member 6 and slid along the concave groove 8. An extendable leg adapted to be inserted into a required pin insertion hole 10 of the small-diameter leg member 5 while being guided ,
The fixed pin 7 is connected to a pin main body 7a longer than the diameter of the large-diameter leg member 6 and a distal end portion of the pin main body 7a so as to be bent, and the distal end portion has a shape corresponding to the concave groove 8 of the small-diameter leg member 5. The pin body 7a is inserted over the pin insertion hole 9 of the large-diameter leg member 6 and the pin insertion hole 10 of the small-diameter leg member 5, and the stopper pin 7b is inserted into the pin body 7a. It is characterized by being refracted with respect to the side surface of the large-diameter leg member 6 .

Claim 2 is the telescopic leg according to claim 1 , wherein the pin body 7a is inserted over the pin insertion hole 9 of the large diameter leg member 6 and the pin insertion hole 10 of the small diameter leg member 5, In a state where the stopper pin 7b is refracted with respect to the pin main body 7a and is attached to the side surface of the large-diameter leg member 6, the pin main body 7a is urged to the side opposite to the insertion direction, and the stopper pin 7b is thereby urged. A coil spring 14 for pressing against the side surface is fitted.

According to a third aspect of the present invention, in the telescopic leg according to the first or second aspect , the cylindrical reinforcing member 11 is fitted and fixed to one end portion of the large-diameter leg member 6, and the large-diameter leg member is attached to the cylindrical reinforcing member 11. A pin insertion hole 9 that matches the 6-side pin insertion hole 9 is provided.

  The effect of the invention by the above-described solution means will be described with reference numerals of embodiments described later. According to the telescopic leg of the invention according to claim 1, the small-diameter leg member 5 is telescopic with respect to the large-diameter leg member 6. The tip 13 of the fixing pin 7 is once inserted into the concave groove 8 from the pin insertion hole 9 on the large-diameter leg member 6 side, and is slid and guided along the concave groove 8 as it is. Without fixing the small leg member 5 and the large diameter leg member 6 to each other, the fixed pin 7 is inserted into the large diameter leg member 6 at a position where the small diameter leg member 5 is expanded or contracted by a required length with respect to the large diameter leg member 6. The hole 9 can be easily and easily inserted into the required pin insertion hole 10 of the small-diameter leg member 5, whereby the expansion / contraction adjustment work of the expansion / contraction leg 2 can be performed efficiently.

According to the present invention , the pin body 7a is inserted across the pin insertion hole 9 of the large-diameter leg member 6 and the pin insertion hole 10 of the small-diameter leg member 5, and the stopper pin 7b is refracted with respect to the pin body 7a. By making it follow the side surface of the large-diameter leg member 6, it is possible to prevent the fixing pin 7 from coming out. Further, since the tip end portion of the stopper pin 7b is formed in a shape corresponding to the concave groove 8 of the small-diameter leg member 5, the slide guide along the concave groove 8 of the small-diameter leg member 5 becomes easy.

According to the second aspect of the present invention, it is possible to effectively prevent the fixed pin 7 from coming off by fitting the coil spring 14 to the pin body 7a.

According to the third aspect of the present invention, the cylindrical reinforcing member 11 is fitted and fixed to one end of the large-diameter leg member 6 so that one end of the large-diameter leg member 6 is deformed or formed at this one end. It is possible to prevent the pin insertion hole 9 being deformed from being deformed.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a tripod stepladder comprising a three-point support structure having telescopic legs according to the present invention in a folded state, and (b) is a side view. FIG. 2 is a side view of the tripod stepladder in use. As shown in FIG. 1 (a), the tripod stepladder includes a ladder-like leg 1 having a substantially C-shaped open shape, and a rod-like extensible leg disposed on the rear side of the ladder-like leg 1. 2, the upper end portion of the ladder-like main body 1 is fixed to the top plate 3, and the upper end portion of the rod-shaped extensible leg 2 is pivotally attached to the top plate 3 for opening and closing. In use, as shown in FIG. 2, the ladder-like main body 1 and the rod-like telescopic legs 2 are opened by a stopper 4 such as a chain with the ladder-like main body 1 and the rod-like telescopic legs 2 opened at a required angle in the front-rear direction. And is supposed to hold.

  The rod-like telescopic leg 2 according to the present invention will be described with reference to FIGS. 3 to 8. As shown in FIGS. 4 and 7, the telescopic leg 2 has a groove 8 formed on one side of the outer peripheral surface over the entire length. A cylindrical small diameter leg member 5 made of an aluminum extrusion mold material, a cylindrical large diameter leg member 6 made of an aluminum extrusion mold material slidably fitted on the small diameter leg member 5, and a small diameter leg member 5 having a large diameter leg. It is comprised with the fixing pin 7 for fixing to the large diameter leg member 6 in the position extended and contracted the required length with respect to the member 6. FIG. In this embodiment, the small-diameter leg member 5 is formed in a cylindrical shape, but the small-diameter leg member 5 may be in a columnar shape (solid shape).

  As shown in FIGS. 3 and 8, a pin insertion hole 9 penetrating in the diametrical direction is provided at one end of the large-diameter leg member 6, and the small-diameter leg member 5 is provided as shown in FIGS. A plurality of pin insertion holes 10 penetrating in the diametrical direction from the concave groove 8 are provided at a constant pitch in the axial direction. As shown in FIGS. 3 to 5, an aluminum cylindrical reinforcing member 11 is fitted and fixed to one end of the large-diameter leg member 6. The cylindrical reinforcing member 11 has a pin on the large-diameter leg member side. A pin insertion hole 9 that matches the insertion hole 9 is provided. The cylindrical reinforcing member 11 is split.

  As can be seen from FIGS. 7A to 7C, the small-diameter leg member 5 is formed in a cylindrical shape, and is formed with a concave groove 8 having an arc-shaped cross section on one side portion of the outer peripheral surface. As can be seen from FIGS. 6 and 8, the large-diameter leg member 6 has a perfect inner circumference and is formed so as to be slidably fitted to the small-diameter leg member 5. As shown in FIGS. 8 (a) and 8 (b), both diametrical side portions 6o and 6o are formed on flat surfaces. The cylindrical reinforcing member 11 has a cross-sectional shape corresponding to the shape of the outer peripheral surface of the large-diameter leg member 6.

  In order to attach the cylindrical reinforcing member 11 to one end of the large-diameter leg member 6, as shown in FIGS. 3A and 3B, the split cylindrical reinforcing member 11 is connected to one end of the large-diameter leg member 6. At the position where the pin insertion hole 9 of the cylindrical reinforcing member 11 and the pin insertion hole 9 of the large-diameter leg member 6 are matched with each other, and the outer peripheral portion and the upper end outer peripheral portion (The welded portion is indicated by W), and the cylindrical reinforcing member 11 is integrally fixed to the large-diameter leg member 6 as shown in FIG.

  As shown in FIGS. 4 to 6 and 9, the fixing pin 7 includes a cylindrical pin body 7a that is sufficiently longer than the diameter of the large-diameter leg member 6, and a pivot pin 12 at the tip of the pin body 7a. And the distal end portion 13 is formed of a stopper pin 7b formed in a circular arc shape corresponding to the cross-sectional shape of the concave groove 8 of the small diameter leg member 5, and the small diameter leg member 5 is connected to the large diameter leg member. As shown in FIG. 5 (a), the tip 13 of the stopper pin 7b is once inserted into the groove 8 from the pin insertion hole 9 of the large-diameter leg member 6 when the groove 6 is expanded and contracted. 8 is inserted into a required pin insertion hole 9 of the small-diameter leg member 5 while being slid and guided along the pin 8, and the pin body 7a is inserted into the pin insertion hole 9 of the large-diameter leg member 6 and the pin insertion hole 10 of the small-diameter leg member 5. The stopper pin 7b is refracted with respect to the pin body 7a. Thus, it is adapted to follow the side surface of the large-diameter leg member 6.

  The pin body 7a of the fixed pin 7 is inserted into the pin insertion hole 9 of the large-diameter leg member 6 and the pin insertion hole 10 of the small-diameter leg member 5, and the stopper pin 7b is inserted into the pin body 7a. The pin main body 7a is urged to the side opposite to the insertion direction in a state where it is refracted and attached to the side surface of the large-diameter leg member 6, and the stopper pin 7b is pressed against the side surface of the large-diameter leg member 6 to prevent it from coming off. For this purpose, a coil spring 14 is fitted.

  9A is a front view of the pin main body 7a, and FIG. 9B is a side view of the pin main body 7a. As can be seen from this figure, the base end portion 7o of the pin main body 7a is crushed by a press to have a wide flat shape. Further, a notch groove 15 is formed on the tip side for connecting the stopper pin 7b in a refractive manner. A long hole 16 is formed in the stopper pin 7b on the base end side. Thus, in order to connect the stopper pin 7b to the pin body 7a, the base end portion of the stopper pin 7b is inserted into the notch groove 15 of the pin body 7a, and the stopper pin is inserted from the pin hole 17 formed at the tip portion of the pin body 7a. What is necessary is just to insert the pivot pin 12 so that the long hole 16 of 7b may be penetrated.

  In addition, as shown in FIGS. 9E and 9F, the coil spring 14 fitted to the pin main body 7a has an inner diameter of one end portion 14a sufficiently larger than the outer diameter of the pin main body 7a and a wide flat base end. It is smaller than the width of the portion 7o, and the inner diameter of the other end portion 14b is slightly larger than the outer diameter of the pin body 7a. Thus, as shown in FIG. 9 (f), the coil spring 14 is fitted into the pin body 7a so that one end portion 14a thereof is positioned on the wide flat base end portion 7o side.

  In using the telescopic leg 2 having the above-described configuration, in order to attach the small-diameter leg member 5 to the large-diameter leg member 6 so as to be extendable and contractible, the upper end side of the small-diameter leg member 5 is changed from the state shown in FIG. After inserting from the lower end of the large leg member 6, for example, the lower end of the small diameter leg member 5 is landed on the floor surface, and the fixing pin 7 is moved from the state where the large diameter leg member 6 is held by one hand. The tip of the fixed pin 7, that is, the tip of the stopper pin 7b, is recessed from the pin insertion hole 9 on the large-diameter leg member 6 side as shown in FIG. By entering the groove 8 and moving the large-diameter leg member 6 up and down appropriately, the tip of the stopper pin 7b is slid along the concave groove 8 as shown in FIG. 5 is the position where the required length of the large diameter leg member 6 has been expanded and contracted, and the tip of the stopper pin 7b has a small diameter. Dropping the required pin insertion hole 9 of the member 5 side.

  Then, the stopper pin 7b is inserted through the pin insertion hole 10 of the large-diameter leg member 6 and the pin insertion hole 10 of the small-diameter leg member 5, and the pin body 7a is pushed further, as shown in FIG. 6 (b). The stopper pin 7b protrudes from the pin insertion holes 9 and 10, and the pin body 7a is inserted through the pin insertion hole 10 of the large-diameter leg member 6 and the pin insertion hole 10 of the small-diameter leg member 5, and then the stopper pin 7b. Is bent at right angles to the pin main body 7a so as to follow the side surface of the large-diameter leg member 6, the pin main body 7a is urged by the coil spring 14 in the direction opposite to the insertion insertion direction, whereby the stopper pin 7b is The fixing pin 7 is pressed against the side surface of the large leg member 6 and is locked in a state where it is prevented from coming off, and there is no possibility that the pin insertion holes 9 and 10 will come out unexpectedly.

  Accordingly, the small-diameter leg member 5 can be fixed to the large-diameter leg member 6 at a position where the required length of the small-diameter leg member 5 is expanded or contracted with respect to the large-diameter leg member 6.

  As described above, when the small-diameter leg member 5 is expanded and contracted with respect to the large-diameter leg member 6, the distal end portion 13 of the fixing pin 7 is once inserted into the concave groove 8 from the pin insertion hole 9 on the large-diameter leg member 6 side. By sliding and guiding the lever along the concave groove 8, the small-diameter leg member 5 and the large-diameter leg member 6 can be expanded and contracted by a required length with respect to the large-diameter leg member 6 without rotating the small-diameter leg member 5 and the large-diameter leg member 6. In this position, the fixing pin 7 can be easily and easily inserted from the pin insertion hole 9 of the large-diameter leg member 6 into the required pin insertion hole 10 of the small-diameter leg member 5, thereby adjusting the expansion and contraction of the telescopic legs 2. Can be performed efficiently. In this case, the distal end portion of the stopper pin 7 b is formed in a shape corresponding to the concave groove 8 of the small-diameter leg member 5, so that it becomes easy to slide and guide along the concave groove 8 of the small-diameter leg member 5.

  In this telescopic leg 2, the cylindrical reinforcing member 11 is externally fitted and fixed to one end portion of the large-diameter leg member 6, and is thus reinforced. It is possible to prevent the one end portion from being deformed and the pin insertion hole 9 from being deformed.

  In addition, a hole 18 is formed in the fixed flat pin 7 at the base end portion of the pin main body 7a in the fixed pin 7, and one end of a cable body 19 (see FIG. 5) made of a chain or a string is formed in the hole 18. By fixing the other part and fixing the other end to the required part of the large-diameter leg member 6, the expansion / contraction adjustment work of the expansion / contraction leg 2 can be performed more efficiently, and the fixing pin 7 can be lost. Can be prevented.

In this embodiment, the fixing pin 7 is composed of the pin main body 7a and the stopper pin 7b that is refractably connected to the tip of the pin main body 7a. However, only one pin corresponding to the pin main body 7a is used. In this case, the tip of the pin may be formed in a shape corresponding to the concave groove 8 of the small-diameter leg member 5. Further, the fixing pin 7 may be constituted by a pin main body 7a and a stopper pin 7b that is refractably connected thereto, and the coil spring 14 may be omitted. In this case, the protrusion 20 (FIG. 6 (b) and FIGS. 9 (a) and 9 (b)) provided on one end side of the pin body 7a.
Therefore, the pin main body 7a does not come out of the pin insertion hole 9 on the large-diameter leg member 6 side.

BRIEF DESCRIPTION OF THE DRAWINGS The front view shown in the state which folded the tripod stepladder which consists of a three-point support structure which has an expansion-contraction leg concerning this invention, (b) is a side view. It is a side view of the tripod stepladder in use state. (a) is a perspective view showing a state before attaching the cylindrical reinforcing member to one end of the large-diameter leg member, and (b) is a perspective view showing a state where the cylindrical reinforcing member is attached. It is a perspective view shown in the state where a small diameter leg member, a large diameter leg member, and a fixing pin were separated from each other. (a) is a perspective view showing a state where the expansion / contraction adjustment operation of the expansion / contraction leg is performed, and (b) is a perspective view showing a state where the expansion / contraction adjustment is finished and fixed with a fixing pin. 5A is an enlarged cross-sectional view of the telescopic leg shown in FIG. 5A along the horizontal plane including the lock pin. FIG. 5B is an enlarged cross-sectional view of the telescopic leg shown in FIG. 5B including the lock pin. FIG. 3 is an enlarged cross-sectional view taken along a horizontal plane. (a) is a partially omitted side view of the small-diameter leg member, (b) is a cross-sectional view taken along the line II of (a), and (c) is a side view of the same-diameter small leg member viewed from the concave groove side. FIG. 4B is a partially omitted side view of the large-diameter leg member, and FIG. (a) Front view of pin body, (b) Side view of pin body, (c) Front view of stopper pin, (d) Side view of stopper pin, (e) Side view of coil spring (F) is a perspective view showing an entire fixing pin in which a coil spring is fitted to a large-diameter leg member.

Explanation of symbols

2 Telescopic leg 5 Small leg member 6 of telescopic leg Large leg member 7 of telescopic leg Fixing pin 7a of telescopic leg Pin body 7b Stopper pin 8 Groove of small leg member 9 Diameter large leg member pin insertion hole 10 Small leg member Pin insertion hole 11 Cylindrical reinforcing member 13 Tip 14 of fixed pin Coil spring

Claims (3)

A cylindrical or columnar small diameter leg member having a concave groove formed on one side of the outer peripheral surface over the entire length, a cylindrical large diameter leg member slidably fitted on the small diameter leg member, and a small diameter leg in telescopic leg comprising a fixing pin for fixing the member to a large diameter leg members at a position obtained by stretching required length to the large diameter leg member,
The large-diameter leg member is provided with a pin insertion hole penetrating in the diametrical direction at one end, and the small-diameter leg member is provided with a plurality of pin insertion holes penetrating in the diametrical direction from the concave groove at a constant pitch in the axial direction. The tip of the fixed pin is once inserted into the concave groove from the pin insertion hole of the large large leg member and slidably guided along the concave groove. An extendable leg inserted into a required pin insertion hole ,
The fixed pin is composed of a pin body longer than the diameter of the large-diameter leg member, and a stopper pin that is refractably connected to the tip portion of the pin body, and the tip portion is formed in a shape corresponding to the concave groove of the small-diameter leg member. The pin body is inserted over the pin insertion hole of the large-diameter leg member and the pin insertion hole of the small-diameter leg member, and the stopper pin is refracted with respect to the pin body and attached to the side surface of the large-diameter leg member. Telescopic legs. The pin body is inserted over the pin insertion hole of the large-diameter leg member and the pin insertion hole of the small-diameter leg member, and the stopper pin is refracted with respect to the pin body and attached to the side surface of the large-diameter leg member. The telescopic leg according to claim 1 , further comprising: a coil spring for urging the pin main body in the state opposite to the insertion direction and pressing the stopper pin against the side surface of the large-diameter leg member.   The cylindrical reinforcing member is fitted and fixed to one end of the large-diameter leg member, and the cylindrical reinforcing member is provided with a pin insertion hole that matches the pin insertion hole on the large-diameter leg member side. Telescopic legs as described in.

Images