JP3035778B1 - Leg fixing device - Google Patents

Abstract

An object of the present invention is to provide a leg fixing device capable of suppressing noise by suppressing an increase in the number of members and the number of manufacturing steps. SOLUTION: A plate-shaped latching member is provided on a column 3 of a first leg so as to be rotatable around an axis substantially parallel to a leg rotation center axis.
(11) is provided, and the base end of the hooking member (11) and the column 3 are connected by a support pin 12 with a head. On post 3,
A substantially flat latch member contact surface 3a is provided.
A compression coil spring 37 is provided between the head 12a of the support pin 12 and the base end of the latching member 11 to make the latching member 11 contact the latching member contact surface 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leg fixing device for a stepladder, a stepladder, a folding ladder and the like.

[0002]

2. Description of the Related Art For example, a stepladder / foldable stepladder, a folding ladder and the like are provided with two legs which are rotatably connected. Each leg has a pair of columns and a plurality of connecting columns. It is composed of a tread.

[0003] In a ladder combined stepladder, the legs are closed and folded when the ladder is stored, and when the ladder is used as a ladder, the legs are slightly opened, and when the ladder is used as a ladder, the legs are widely opened so as to be straight. It is. The ladder is provided with the following leg fixing device for fixing the ladder to the use state as a stepladder and the use state as a ladder, respectively. In other words, the base end of the latching member is rotatably attached to a support pin fixed to the side surface of the first leg support, and is used as a stepladder on the corresponding second leg support side surface. An engaging pin for fixing to a state and an engaging pin for fixing to a use state as a ladder are fixed. An engaging recess having an engaging pin fitting opening is formed in a portion on the rotation end side of the engaging member, and the engaging member is rotated in a predetermined direction so that the engaging recess is formed in each engaging pin. By engaging, the legs are respectively fixed in corresponding states. Further, by rotating the latching member in the opposite direction, the engaging recess is disengaged from the engaging pin, and the leg can freely rotate.

The foldable ladder has a retracted state in which the legs are folded and a use state in which the legs are opened in a straight line. To fix the legs in these two states, respectively, substantially the same as described above. A leg fixing device is provided. The folding stepladder has a retracted state in which the legs are folded and a use state in which the legs are opened by a predetermined amount. To fix the legs in these two states, respectively, almost the same leg fixing as described above. A device is provided.

In such a leg fixing device, if there is play between the latch member and the leg, the two collide with each other and generate noise, so that there is a gap between the base end of the latch member and the first leg. In addition to interposing an anti-vibration member for preventing direct contact between the two, and between the rotation end of the latch member and the second leg,
A device in which a vibration damping member for preventing direct contact between the two is interposed has been proposed (see Japanese Utility Model Registration No. 2500574).

[0006]

In the above-mentioned conventional leg fixing device, the number of members and the number of members are reduced because elastic members are interposed at both the base end and the rotation end of the latching member for noise reduction. It has the disadvantage of increasing the number of manufacturing steps.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a leg fixing device capable of suppressing noise while suppressing an increase in the number of members and the number of manufacturing steps.

[0008]

SUMMARY OF THE INVENTION A leg fixing device according to the present invention is a device for fixing two relatively rotated legs at a predetermined angular position, comprising a first leg. A plate-shaped locking member is provided so as to be rotatable about an axis substantially parallel to the leg rotation center axis.
In a leg fixing device in which an engaging portion that engages with a portion on the rotation end side of the latching member is provided, and a base end of the latching member and the first leg are connected by a support pin with a head. , The first leg having a substantially flat latch member abutting surface, wherein the latch member is disposed between the head of the support pin and the proximal end of the latch member. An elastic member to be brought into contact with the member contact surface is interposed.

The term "substantially flat surface" means a surface which allows a wide range of contact between the latch member and the leg, and a rib is provided on the outer surface of the leg or the column constituting the leg. You may.

According to the leg fixing device of the present invention, the first leg is provided with the hooking member abutting surface, and the base of the hooking member is provided between the head of the support pin and the base end of the hooking member. Since the elastic member that makes the end portion abut on the latch member contact surface of the first leg is interposed, the latch member and the first leg contact over a wide area, and the latch on the first leg is performed. The movement of the member is suppressed. As a result, even if there is a slight play between the pivoting end of the latching member and the second leg, the pivoting end of the latching member does not hit the second leg, and Even though the elastic member is provided only on the base end side of the stop member, a sufficient noise reduction function can be exhibited. Therefore, a latching member capable of suppressing noise while suppressing an increase in the number of members and the number of manufacturing steps is composed of a rectangular plate-shaped base member and a rectangular plate-shaped rotating end which are rotatably connected to each other. It may be composed of side members, and may be foldable at a connection portion between the two. In this case, it is preferable that the connecting end of the rotating end side member be overlapped with the inside of the connecting end of the base end side member. Thus, even with the foldable latch member, the rotating end of the latch member does not hit the second leg, and a sufficient noise reduction function can be exhibited.

The engaging portion comprises a shaft portion substantially parallel to the center axis of rotation of the leg and a head portion having a larger diameter than the shaft portion, and the latching member has a rectangular shape whose base end portion is supported by the first leg. A flat portion, and a bent portion that is bent so as to protrude outward from the leg rotation center axis from a portion on the rotation end side of the flat portion, and a size in which the head of the engaging portion enters the bent portion. The head insertion hole is provided, and a shaft portion engagement hole that is continuous with the head insertion hole and engages with the shaft portion of the engagement portion is provided in a portion on the rotating end side of the flat plate portion. is there. By doing so, play in the portion on the rotation end side of the latching member is suppressed, and the sound deadening function becomes more reliable.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show an embodiment in which the present invention is applied to a stepladder / ladder. In the following description, “front” refers to the left side of FIG. 2, “back” refers to the right side of FIG.

As shown in FIG. 1, the ladder / stepladder is a pair of front and rear legs (1a) and (1b) having upper ends connected to each other so as to be rotatable relative to each other. And a pair of left and right leg fixing devices (2).

Each leg (1a) (1b) is fixed to a pair of columns (3) having a U-shaped cross section with the opening facing inward in the left-right direction, and to be parallel to each other therebetween. And a plurality of steps (4). The upper ends (connection ends) of the right column (3) of the two legs (1a) and (1b) and the upper ends of the left column (3) are two steel plate-like connecting members (5) of the same shape. Are rotatably connected via a. The connecting member (5) has a rectangular part (5a) fixed to the outer surface of the column (3), and a projection protruding toward the column (3) corresponding to the column (3) to which the rectangular part (5a) is fixed. (5b). The rectangular portion (5a) is fixed to the outer surface of the support (3) with rivets, and the protruding portions (5b) of the connecting member (5) are connected to each other by rivet-shaped connecting pins (6).
Thus, the two legs (1a) and (1b) are
(6) can be mutually rotated about the center axis (leg rotation center axis).

In FIG. 1, a leg fixing device (2) fixes two legs (1a) and (1b) in a stepladder state.
, The two legs (1a) and (1b) rotate freely, and the rear leg (1b) is rotated from the stepladder state shown by the solid line in FIG. 1 to the ladder state shown by the chain line in the same figure. Can be switched to Then, the two legs (1a) and (1b) can be fixed in this ladder state by the leg fixing device (2).

Since the left and right leg fixing devices (2) have the same structure, the right one will now be described with reference to FIGS.

The right leg fixing device (2) includes a steel latch member (11) rotatably attached to a right support (3) of the front leg (1a) by a latch member support pin (12); A first engagement pin (13) for fixing in a stepladder state and a second engagement pin (14) for fixing in a ladder state are provided. First engagement pin (13)
Are provided at the same height as the retaining member support pin (12) of the right support (3) of the rear leg (1b). In addition, the second engagement pin (1
4) is provided at the upper end of the right column (3) of the rear leg (1b). The second engagement pin (14) is connected to the rectangular portion (5) of the connecting member (5).
Also serves as a rivet for fixing a) to the pillar (3) outer surface.
In addition, the retaining member support pin (12) of the right support (3) of the front leg (1a)
A third engaging pin (15) is provided at a position below the third engaging pin for accommodating the latching member (11) in a folded state.

As shown in an enlarged view in FIG. 2, the latching member (11) includes a rectangular plate-shaped base end member (19) rotatably connected to each other and a rectangular plate-shaped rotating end side. The front end of the proximal member (19) is a right support of the first leg (1a).
Supported by (3). The rotating end side member (20) is bent so as to protrude rightward (outward in the leg rotation center axis direction) along the upper edge of the elongated rectangular flat plate portion (21) and the flat plate portion (21). Upper bent part (22) and the lower bent part bent so as to project rightward from the lower edge of the rotation end side of the flat plate part (21)
(23) and a rear bent portion (24) bent so as to project rightward from the rear end (rotating end) of the flat plate portion (21). The base end member (19) and the pivot end member (20) are arranged such that the connection end of the pivot end member (20) is superimposed on the inside of the connection end of the base end member (19), By being connected by the connecting pin (35) at the lower part of the connecting portion, the whole can be folded in an inverted V-shape. The upper edge of the base member (19) abuts on the upper bent portion (22) of the rotating end member (20) from below, thereby preventing the V-shape as a whole. ing. Therefore, when the ladder-combined stepladder is in the stepladder state, the latching member (11) is folded in an inverted V-shape at an intermediate portion thereof, so that the latching member (11) is connected to the first engagement pin.
(13) It is possible to change from the stepladder state to the folded state without removing it from (13). Further, by extending the hook member (11) linearly from the inverted V-shape, the hook member (11) can be changed from the folded state to the stepladder state without removing the hook member (11) from the first engagement pin (13). it can. This facilitates use as a stepladder. When switching from the stepladder state to the ladder state, the latch member (11) is once removed from the first engagement pin (13), and then the rear end of the second engagement pin (1) corresponding to the ladder state is removed.
4) must be engaged.

The upper bent portion (22) and the rear bent portion (24)
The angle between the flat plate portion (21) and the lower bent portion (23) and the flat plate portion (21) is an obtuse angle of about 140 ° as shown in FIG. ing.

The first engagement pin (13) is made of steel, as shown in FIG. 4, and has a cylindrical stepped shaft portion (30) projecting a predetermined length from the outer surface of the column (3); A head (31) is provided integrally with the base end of the part (30), and the small diameter part of the shaft part (30) penetrates the outer wall of the column (3) and is riveted. The second engagement pin (14) and the third engagement pin (15) have the same shape as the first engagement pin (13).

As shown in an enlarged manner in FIG.
The head (31) of the first engagement pin (13) is attached to the lower bent portion (23) of (1).
Approximately square head insertion hole with front and rear width larger than the diameter of
Is provided, and the rear end of the flat plate portion (21) (portion on the rotation end side)
The shaft portion (3) of the first engagement pin (13) connected to the head insertion hole (26)
An arc-shaped shaft engaging hole (27) having a diameter larger than the diameter of (0) is provided. The shaft engaging hole (27) is the first
By engaging the shaft portion (30) of the engagement pin (13), the rotation of the locking member (11) is prevented, and the play of the rotating end of the locking member (11) is suppressed. Thus, a stable stepladder state is secured. The head insertion hole (26) is
This is for inserting the head (31) of the first engagement pin (13) while rotating (1). A shaft guide hole (28) having a width slightly larger than the diameter of the shaft (30) of the engagement pin (13) is provided between the head insertion hole (26) and the shaft engagement hole (27). Is provided.
The shaft portion (30) of the first engagement pin (13) passes through the shaft portion guide hole (28) and is housed in the shaft portion engagement hole (27), and is temporarily housed in the shaft portion engagement hole (27). The first engagement pin (13) is configured to be difficult to pass through the shaft guide hole (28).

The rear end of the flat plate portion (21) of the latching member (11) has a substantially trapezoidal shape slightly forward of the shaft portion engaging hole (27) and engages with a locking member (16) described later. Lock member engagement hole of (29)
The leg fixing device (2) is provided with a locking member (11).
Locking member for preventing the first member from coming off the first engagement pin (13)
(16) and an elastic member (17) for urging the lock member (16) counterclockwise (lock side). Lock member
(16) is plate-shaped, the shaft engaging hole (27) of the latch member (11)
The lock member (11) is rotatably attached to the rear end of the flat plate portion (21) by a lock member support pin (18) located above the lock member (11). In a state where the lock member (16) is urged counterclockwise by the elastic member (17), the shaft portion of the first engagement pin (13) is moved.
(30) a concave arc-shaped part (32) abutting diagonally from below, and a convex arc-shaped part (33) connected to the concave arc-shaped part (32) and closing the front upper part of the head insertion hole (26) And an outer bent portion (34) abutting from above on a lower edge portion of a lock member engaging hole (29) provided in the flat plate portion (21) of the latching member (11). . Lock member (1
6) is between the latch member (11) and the outer surface of the support (3),
Its horizontal movement is restricted. Elastic member (17)
Is a spring formed in a substantially U-shape. A center portion (17a) is wound around a lock member support pin (18), and one half portion is formed.
The end of (17b) is abutted from below on the upper edge of the latch member (11), and the end of the other half of the U-shape (17c) is outside the lock member (16). They are brought into contact with the folds (34) from above, respectively.

Referring to FIG. 5, the operation of fixing and releasing the fixing of the legs (1a) and (1b) will be described. In order to engage the rear end of the latch member (11) with the first engagement pin (13), the latch member (1
When 1) is rotated in a predetermined direction, first, a latch member (11)
The first engagement pin (1) is inserted into the head insertion hole (26) of the lower bent portion (23) of the
The head (31) of 3) enters. The head insertion hole (26) and the first engagement pin (1
Since it does not engage with 3), the latch member (11) can be subsequently rotated. At this time, the lock member (16) is pressed against the urging force of the elastic member (17) by the convex arc-shaped portion (33) being pushed by the shaft portion (30) of the first engagement pin (13). It is turned clockwise. Therefore, the locking member (11) rotates without being hindered by the lock member (16), and the shaft engaging hole (27) and the shaft (30) of the first engaging pin (13) are moved. The rotation is continued until the engagement occurs, and the rotation is stopped at the time of the engagement. Thus, the legs (1a) and (1b) are fixed in the stepladder state. Also, by rotating the locking member (11) in the opposite direction while rotating the locking member (16) clockwise by hand against the urging force of the elastic member (17), first, First through the shaft engaging hole (27)
The shaft (30) of the engagement pin (13) comes off, and then the head insertion hole (2
The head (31) of the first engagement pin (13) comes off from (6), and the legs (1a) (1b)
Can freely rotate. The fixing and release of the legs (1a) and (1b) in the ladder state and the folded state are the same as described above.

As shown enlarged in FIG. 6, the first leg (1a)
The outer surface (3a) of the pillar (3) is substantially flat, and this portion (the abutting member contact surface) of the outer surface (3a)
1) is in contact. The base end of the retaining member (11) and the support (3) are connected by a support pin (12) which is a rivet-shaped stepped pin. That is, the latch member (1
The support pin large-diameter shaft insertion hole (25) is provided in the base end member (19) of (1),
Support pin small-diameter shaft insertion holes (36) are provided on the outer wall of the support (3), respectively, and the tip of the large-diameter shaft (12b) of the support pin (12) is in contact with the locking member of the support (3). (3a), the small-diameter shaft portion inserted into the small-diameter shaft insertion hole (36) of the proximal-side member (19).
The tip of (12c) is riveted. Between the head (12a) of the pin (12) and the proximal end of the retaining member (11), the proximal end of the retaining member (11) is connected to the retaining member contact surface ( 3a)
A compression coil spring (37) is brought into contact with the compression coil spring (37). Between the compression coil spring (37) and the latch member (11) and the pin (1
Flat washers (38) and (39) are interposed between the riveted portion at the tip of 2) and the outer wall of the column (3), respectively. The support pin large-diameter shaft insertion hole (25) of the hooking member (11) is a long hole in the front and back, and the hooking member (11) is slightly moved with respect to the support pin (12). Can be.

According to the leg fixing device (2), the locking member
Since a compression coil spring (37) for contacting the base end of (11) with the latch member contact surface (3a) of the first leg (1a) is interposed,
The latch member (11) and the first leg (1a) are in contact with each other over a wide area, and the movement of the latch member (11) with respect to the first leg (1a) is suppressed. As a result, even if there is some play between the pivot end of the latch member (11) and the second leg (1b), the pivot end of the latch member (11) and the second There is no collision with the leg (1b), and a sufficient silencing function can be exhibited.

The compression coil spring shown in FIG. 6 has a general cylindrical shape.
As shown in FIG. 7, the head (12a) side of the pin (12) has a small diameter,
The hook member (11) may be a large-diameter conical coil spring (40). With this configuration, even if there is no flat washer between the compression coil spring (40) and the latch member (11), the latch member (11)
Can be pressed over a large area,
1) It is excellent in that rattling can be suppressed and the latch member (11) can be smoothly rotated.

The leg fixing device according to the present invention can also be applied to a folding ladder or a folding stepladder. In that case, only the engagement pin for fixing the leg in the retracted state and the engagement pin for fixing the leg in the use state may be provided. In the above embodiment, the latch member (11) is composed of two members (19) and (20).
Although it is supposed to be foldable, it is needless to say that the latching member may not be foldable.
Further, the cross-sectional shape of the support (3) may be not a U-shape but a square, and furthermore, the head (12a) of the pin (12) and the base end of the locking member (11) may Between the compression coil spring (37)
Instead of (40), another elastic member may be interposed to make the latch member (11) contact the latch member contact surface (3a) of the first leg (1a).

[Brief description of the drawings]

FIG. 1 is a perspective view showing a ladder and stepladder in which the leg fixing device of the present invention is used.

FIG. 2 is a side view of the leg fixing device.

FIG. 3 is an enlarged side view of a rotation end of a latch member of the leg fixing device.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a perspective view of the part of FIG. 3;

FIG. 6 is an enlarged horizontal sectional view of a base end of a latch member of the leg fixing device.

FIG. 7 is a view showing another embodiment of the base end portion of the locking member.
FIG.

[Explanation of symbols]

 (1a) (1b) Leg (2) Leg fixing device (3a) Latch member contact surface (11) Latch member (12) Latch member support pin (12a) Head (13) (14) Engagement pin (19) Base end member (20) Rotating end member (21) Flat plate (23) Lower bent part (26) Head insertion hole (27) Shaft engaging hole (30) Shaft (31) Head (37) (40) Compression coil spring (elastic member)

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E06C 1/39-1/393

Claims (3)

(57) [Claims] 1. Two legs (1a) (1b) which are relatively rotated.
For fixing the camera at a predetermined angular position.
The first leg (1a) is provided with a plate-shaped latch member (11) so as to be rotatable around an axis substantially parallel to the leg rotation center axis, and the second leg (1b) is Engaging portions (13) and (14) are provided to engage with the portion on the rotating end side of the member (11), and the base end of the latching member (11) and the first leg (1a) are A leg anchoring device joined by a support pin (12), wherein the first leg (1a) is provided with a substantially flat latch member contact surface (3a), and the head of the support pin (12) is provided. Part (12a) and latch member (11)
Elastic members (37) and (40) for contacting the latch member (11) with the latch member contact surface (3a) of the first leg (1a) are interposed between the base member and the base end of the first leg (1a). A leg fixing device characterized by the above-mentioned. 2. A locking member (11) comprising a rectangular plate-shaped base end member (19) and a rectangular plate-shaped rotating end member (20) rotatably connected to each other. The leg fixing device according to claim 1, wherein the connecting end of the moving end member (20) is overlapped inside the connecting end of the proximal end member (19). 3. An engaging portion (13) (14) comprising a shaft portion (30) substantially parallel to a leg rotation center axis and a head portion (31) having a larger diameter than the shaft portion (30).
A latching member (11) has a rectangular flat plate portion (21) whose base end is supported by the first leg (1a), and a leg rotation center from a portion on the rotation end side of the flat plate portion (21). A bent portion (23) bent so as to protrude outward from the axis, and the bent portion (23) has an engaging portion (13) (1).
A head insertion hole (26) large enough to receive the head (31) of (4) is provided. The leg fixing device according to claim 1, further comprising a shaft engaging hole (27) that engages with the shaft (30) of (13) and (14).