JP2023018147A5 - - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing stopper for preventing motion of an object to be motion-prevented .

As a structure for working at height , which is provided with a ladder body in which a plurality of treads are stepped between two supports, two ladder bodies are disclosed, for example, in Patent Document 1 below. There is known a stepladder in which the upper ends of two are connected to each other by hinge fittings so that they can be freely opened and closed . Further, as one form of stepladder, a stepladder that can also be used as a ladder by turning one of two ladder bodies upside down is known.

Japanese Patent Application Laid-Open No. 2003-193780

SUMMARY OF THE INVENTION An object of the present invention is to provide a rocking stopper capable of preventing the movement of an object to be inhibited when the object is turned upside down .

This invention consists of the following aspects in order to achieve said objective.

1) It is oscillatably provided on the movement-blocking object,
When the motion-preventing object is in the predetermined first posture, it swings in the first swinging direction due to its own weight and is arranged at the first position where the motion of the motion-preventing object is not blocked,
When the motion-preventing object is in the second posture that is upside down from the first posture, it swings in the second swinging direction opposite to the first swinging direction due to its own weight, thereby preventing the motion of the motion-preventing target. a rocking stop located in a possible second position;

2) The rocking stopper according to 1) above, wherein the movement-blocking object is an operating mechanism capable of unlocking the telescopic device by the locking mechanism.

3) A first contact portion is provided on a side portion of the swing stopper on the first swing direction side,
When the rocking stopper rocks in the first rocking direction, the first abutting part is brought into contact with the first abutted part provided in the rocking stopper accommodating part of the object to be prevented from moving. , the rocking stopper is held at the first position,
A second contact portion is provided on a side portion of the swing stopper on the second swing direction side,
When the rocking stopper rocks in the second rocking direction, the second abutting part is brought into contact with the second abutted part provided in the rocking stopper accommodating part of the object to be prevented from moving. , the rocking stopper of 1) or 2) above, wherein the rocking stopper is held in the second position.

4) A third contact portion is provided at a portion of the swing stopper on the swing tip side,
When the swing stopper is at the second position, the third abutment portion abuts against the third abutted portion provided at a position facing the third abutment portion, thereby preventing the motion of the motion-preventing object. , a rocking stopper according to any one of the above 1) to 3).

5) The rocking stopper according to any one of 1) to 4) above, wherein the rocking stopper is flat and can rock around a rocking axis extending in its thickness direction.

According to the swing stopper of the present invention, it is possible to prevent the motion of the motion-preventing object when the motion-preventing object is turned upside down.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an overall perspective view of a stepladder and ladder provided with a rocking stopper according to an embodiment of the present invention; FIG. 4 shows a locked state of an extendable leg device provided in the same ladder/stepladder , where (a) is a partial front view and (b) is a cross-sectional view taken along line BB of (a). FIG. 4 shows the telescopic leg device in an unlocked state, where (a) is a partial front view and (b) is a cross-sectional view taken along line BB of (a). It is a perspective view which shows the lower part of the same telescopic leg apparatus. It is a perspective view which decompose|disassembles and shows the lower part of the telescopic leg apparatus. (a) is a vertical vertical cross-sectional view showing the lower part of the telescopic leg device, and (b) is a cross-sectional view taken along line BB in (a). It is a perspective view which shows the upper part of the telescopic leg apparatus. It is a perspective view which decompose|disassembles and shows the upper part of the telescopic leg apparatus. It is a perspective view which decompose|disassembles and shows the upper operation lever of the telescopic leg apparatus. Fig. 3 is a vertical cross-sectional view showing the upper part of the telescopic leg device, where (a) shows a state in which the upper operating lever is in the unlock non-operating position, and (b) shows a state in which the upper operating lever is in the unlocking operation position; , and (c) shows the state when the ladder body is turned upside down.

Next, with reference to FIGS. 1 to 10, an embodiment of a ladder/ladder equipped with a rocking stopper according to the present invention will be described.
2(b), 3(b), and 10 are referred to as "front", and the left sides thereof as "rear " , and "left and right" as viewed from the front. left and right (for example, left and right in FIGS. 2(a), 3(a), and 6).

As shown in FIG. 1, the ladder-combined stepladder (1) consists of two ladder bodies (2F) and (2R), front and rear, which are connected at their upper ends by hinge fittings (201) so that they can be freely opened and closed. For example, by turning the front ladder body (2F) upside down, it can be used as a ladder.
Each of the front and rear ladders (2F) and (2R) consists of two hollow struts (3) on the left and right, and multiple struts (here 5) treads (4A), (4B), (4C), (4D), and (4E). The uppermost tread (4E) constitutes a top plate when used as a stepladder.
Between the tops of the left struts (3) and the tops of the right struts (3) of the front and rear ladder bodies (2F) and (2R), the gap stoppers (202) are bridged and stopped. The opening stopper (202) consists of two links rotatably connected at one end, and a hook provided at the other end of one of the links is a locking pin provided on the strut (3). It can be detachably attached to the
Telescopic leg devices (5) according to the present invention are provided below the left and right struts (3) of the front and rear ladder bodies (2A) and (2B), respectively.

2 to 10 show the detailed structure of the front ladder body (2F). Since the rear ladder body (2R) is substantially symmetrical with the front ladder body (2F), detailed illustration and description thereof will be omitted.
The left and right struts (3) of the front ladder body (2F) are made of a metal profile such as an aluminum alloy profile, and have a substantially U-shaped cross section that opens inward in the left-right direction.
Each of the treads (4A), (4B), (4C), (4D), and (4E) is also made of a metal profile such as an aluminum alloy profile, and is hollow and has a substantially rectangular cross section.
The left and right ends of the lowest tread (4A) and the second tread (second upper tread) (4B) are connected via a pair of front and rear brackets (101) and (102), respectively. It is attached to each of the left and right struts (3). A required gap (S) is formed between the left and right ends of these treads (4A) and (4B) and the left and right struts (3). The left and right ends of the third tier from the bottom (first upper tier) (4C) and the upper tiers (4D) and (4E) are inserted into the left and right struts (3). It is attached directly to the front and rear side walls of the strut (3) by, for example, rivets (11).

Telescoping leg devices (5) provided at the bottom of each of the left and right struts (3) of the front ladder body (2F) are slidably inserted into each strut (3) from the lower end and grounded at the end on the opposite insertion side. It comprises a telescopic leg member (6) having a portion (61) and a lock mechanism (7) for locking the telescopic leg member (6) at an arbitrary slide position.

The telescopic leg member (6) is made of a metal profile such as an aluminum alloy profile, and has a substantially rectangular cross section. The front and rear wall portions of the telescopic leg member (6) are curved in a substantially U shape so as to protrude toward each other. Slide guide ridges (63) are formed in an extended shape on the front and rear edges of the left and right outer wall portions of the telescopic leg member (6). It is slidably fitted in a vertical recessed groove (31) formed in the laterally outer edge of the inner surface of the front and rear wall portions (see FIG. 6(b)). An internal enlarged groove (62) opening inward in the left-right direction is formed in the left-right inner wall portion of the telescopic leg member (6).

The lock mechanism (7) is a rack (locked portion) provided on the lateral inner surface of each telescopic leg member (6) and having a large number of teeth (711) arranged in the longitudinal direction of the telescopic leg member (6). ) (71) and near the lower end of each strut (3) in the front ladder body (2F), more specifically, to attach the left and right ends of the lowest tread (4A) to the strut (3) The front and rear brackets (101) are attached to the front and rear brackets (101) so as to be swingable about a swing shaft (720) extending in the front-rear direction. A locking member (72) having a locking portion (721) formed thereon and a tooth (721a) of the locking portion (721) connecting the locking member (72) with a tooth (711) of the rack (71). ) and a spring (biasing member) (73) that biases in the direction of meshing (counterclockwise direction in FIG. 6(a)).
An operation lever portion (722) is provided at the left-right inner end portion of the locking member (72). By pressing the operation lever portion (722) upward, the elastic force of the spring (73) ( The locking member (72) moves in the direction (clockwise direction in FIG. 6A) in which the teeth (721a) of the locking portion (721) are disengaged from the teeth (711) of the rack (71) against the biasing force). is rocked.
In other words, the locking member (72) is in a lock position where the teeth (721a) of the locking portion (721) mesh with the teeth (711) of the rack (71), and the teeth (721a) of the locking portion (721). It is switchable between unlocked positions in which the teeth (711) of the rack (71) are disengaged.
The spring (73) is vertically interposed between the laterally inner portion of the locking member (72) and the lower surface of the lowermost tread (4A). A spring holding portion (724) extending upward in a branched manner is formed at an intermediate position in the length of the left-right direction inner portion of the locking member (72). The lower end of the spring (73) is inserted and held between the central portion (723) through which the spring (720) is inserted.
A metal cover member (103) having a substantially U-shaped cross section is fitted to the lower end of each column (3) so as to cover the opening of each column (3). The front and rear brackets (101) are attached to the front and rear walls of the column (3) from above the front and rear walls of the cover member (103) by rivets or the like. The cover member (103) is formed with a vertically rectangular communication window (103a) for exposing a portion of the teeth (711) of the rack (71). The teeth (721a) of the locking portion (721) of the locking member (72) mesh with the teeth (711) of the rack (71) through the communication window (103a).
It should be noted that the lock mechanism (7) is not limited to the illustrated one, and can be changed as appropriate. For example, the locking member (72) may be provided below the lowermost tread (4A) as described above, may be incorporated inside the tread (4A), or may be placed above the tread (4A). may be provided.

The telescopic leg device (5) is equipped with a remote control mechanism having the following configuration.
That is, on the back of the first upper tread (4C), which is the third tread counted from the bottom of the front ladder body (2F), left and right telescopic leg members (6) with left and right locking mechanisms (7) are attached. ) is provided so as to perform a predetermined operation, and an upper operating member (8) for interlocking the upper operating member (8) with each locking member (72). Two left and right transmission members (9) are provided along each strut (3). By operating the upper operation member (8) to perform a predetermined operation, each locking member (72) is switched to the unlocked position via each transmission member (9).
Considering the size of a normal ladder body, the third upper tread (4C) from the bottom is considered appropriate for the first upper tread where the upper operating member (8) is provided on the back side. Depending on the size of the body and the mode of use, the second step from the bottom or the fourth or more steps from the bottom may be used.

The upper operating members are attached to the rear surfaces of the substantially left and right halves of the first upper tread (4C) so as to be swingable about axes extending in the left-right direction and arranged close to each other. It consists of two left and right flap-shaped upper operating levers (8). By swinging these upper operating levers (8) in the unlocking operation direction (counterclockwise direction in FIGS. 10(a) and (b)) (A) to approach the back surface of the first upper tread (4C), , the locking member (71) can be switched to the unlocked position via the transmission member (9).
Each upper operating lever (8) has a lever body (81) made of a metal profile such as an aluminum alloy profile. The lever body (81) is flat and hollow, and has an inclined wall portion (811) extending obliquely forward and upward at its upper edge. A rearwardly curved fitting ridge (811a) for forming a hinge is formed at the tip edge of the inclined wall (811).
On the other hand, the upper edge portion of the back surface of the first upper tread (4C) is formed with a fitting concave groove (41) extending in the left-right direction. The hinge-forming fitting recessed groove (41) has a cross section extending obliquely forward and upward from the upper edge of the back surface of the first upper tread (4C), and its inner portion curves rearward. I am forced to
The hinge-forming fitting ridge (811a) of the lever body (81) is inserted into the hinge-forming fitting recessed groove (41) of the first upper tread (4C) through the opening thereof so that it can rotate freely. They are fitted together, whereby the lever body (81) is attached to the back side of the first upper tread (4C) so as to be able to swing around the fitting projection (811a).

A first end cap (82) is fitted over the left-right outer end of the lever body (81), which is closer to the column (3). The first end cap (81) is made of a synthetic resin molded product. A tapping screw (not shown) penetrates the end cap (81) and is screwed into a tapping screw hole (812) at the bottom of the lever body (81). It is fixed to the lever body (81).
The first end cap (82) is integrally provided with an arm portion (821) extending forward from its lower portion so as to protrude into the space below the first upper tread (4C).
A cam shaft (821a) extending toward the opening of each strut (3) is integrally formed at the middle position (or tip position) of the arm portion (821).
A rocking stopper (84) is provided at the base end of the arm (821) and is rockable about a shaft extending in the left-right direction. As shown in FIG. 10, the rocking stopper (84) is substantially bell-shaped when viewed from the side, and is a half-split insert formed so as to protrude outward in the left-right direction from one end thereof. By loosely inserting the portion (841) into the hole formed in the vertical wall portion of the arm portion (82 1 ) , the insertion portion (841) (841) ( oscillating axis) . As shown in FIGS. 10(a) and 10(b), when the ladder/ladder (1) is used as a stepladder, the swing stopper (84) rotates clockwise due to its own weight. The first abutment portion (842) provided on the side portion of the arm portion (82 1 ) swings in the swing direction, and the first contact portion (842) is the horizontal lower wall portion of the arm portion (82 1 ). It is laid sideways (first position) so as to abut against the contact portion (822) so that it does not interfere with the first upper tread (4C) when the upper operating lever (8) swings. On the other hand, as shown in FIG. 10(c), when one of the ladder bodies (for example, the front ladder (2F)) is turned upside down in order to use the ladder stepladder (1) as a ladder, the ladder body The swing stopper (84) swings by its own weight in the second swing direction , which is the counterclockwise direction in FIG. The contact portion (843) is brought into contact with the second contact portion (823) , which is a part of the first end cap (82) (the upper portion in FIG. 10(c)), and the upper operating lever (8) is moved. and the rear surface of the first upper tread (4C) (second position) . Therefore, when the ladder body is turned upside down as shown in the drawing, the third abutment portion (844) provided at the other end of the swing stopper (84) is in contact with the rear surface of the first upper tread (4C). The upper operating lever (8) moves in the unlocking operation direction (counterclockwise direction in FIG. 10(c)) by being brought into contact with the third contacted portion (42) formed by the corner portion between the lower surface and the lower surface. Since rocking is prevented, for example, even if the upper operating lever (8) is pushed while going up or down a ladder, the lock of the telescopic leg member (6) by the lock mechanism (7) is released by mistake. It can be used safely without

A second end cap (83) is fitted over the left-right inner end of the lever body (81) near the center of the length of the first upper tread (4C). The second end cap (83) is made of a synthetic resin molded product, and has an insertion portion (832) having a substantially cross-shaped cross section formed so as to protrude from one side of the second end cap (83). It is fixed to the same end by fitting it into the .
A leaf spring portion for lever return (biasing member for lever return) (831) is integrally formed with the second end cap (83). The leaf spring portion (831) has a substantially tongue-like shape when viewed from the front, and extends obliquely forward from the second end cap (83) outward in the left-right direction in a curved shape. ) and the back surface of the first upper tread (4C), and its spring elasticity urges the upper operation lever (8) away from the back surface of the first upper tread (4C). .

Each transmission member (9) has a gap (S ) and is slidable along the length of each strut (3). The lifting bar (91) has a substantially strip-like shape with front and rear edges bent outward in the left-right direction. The length of the lifting bar (91) is slightly shorter than the length from the lower surface of the first upper tread (4C) to the upper surface of the lowest tread (4A) on the left-right inner side of the column (3). is done. The width of the lifting bar (91) is slightly smaller than the width of the inner portion of the column (3) in the left-right direction.
A vertically elongated strip-shaped communication window (911) is formed at the lower end of the lifting bar (91). The communication window (911) is used when fitting and fixing the retaining cap (62) to the upper end of the telescopic leg member (6) inserted into the support (3). The retaining cap (62) has a retaining portion (621) that protrudes inward in the left-right direction. The leg member (6) is prevented from falling off the support (3). By providing a communication window (911) in the lifting bar (91), the retaining cap (62) can be fitted and fixed to the upper end of the telescopic leg member (6) in the final step of assembling the front ladder body (2F). becomes possible, facilitating the assembly work.

A slider (92) is slidably accommodated through an opening of the column (3) below the first upper tread (4C) within the column (3). Also, the slider (92) is connected to the upper end of the lifting bar (91).
The slider (92) is made of a synthetic resin molded product in the shape of a substantially square block, and the upper end of the lifting bar (91) is connected and fixed to the lower portion of the lateral inner surface of the slider (92) by rivets or the like.
The upper surface of the slider (92) is formed with a cam surface (921) that slopes forward upward. The cam shaft (821a) slides on the cam surface (921) as the upper operating lever (8) swings. The cam surface (921) and cam shaft (821a) form a cam mechanism (upper interlocking mechanism) that converts the swinging motion of the upper operating lever (8) into the vertical motion of the slider (92) and lifting bar (91). Configure. That is, when the upper operating lever (8) is swung in the unlocking operation direction (counterclockwise direction in FIGS. 10(a) and (b)), the cam shaft (821a) moves over the cam surface (921) at its lower end. By sliding from the bottom to the top, the slider (92) is pushed down and the lift bar (91) is slid downward.
The slider (92) is provided with a locking stopper (922) located above the lower end of the cam surface. The stopper portion (922) is a substantially horizontal rod-shaped member provided on the outer wall portion rising from the lateral outer edge of the cam surface (921) of the slider (92) so as to protrude toward the cam surface (921). When the upper operating lever (8) is swung away from the back surface of the first upper tread (4C), it is positioned above the camshaft (821a). Therefore, even if an unintended downward external force is applied to the lifting bar (91), for example, by touching the lifting bar (91) with a hand, the cam shaft (821a) is pushed from above by the stopper portion (922). This prevents the slider (92) and the lifting bar (91) from sliding downward and unlocking the telescopic leg member (6).

A pressing member (93) is attached to the lower end of the lifting bar (91). The pressing member (93) has a substantially vertically long plate shape and is made of, for example, a synthetic resin molding. The pressing member (93) has a stepped portion (932) that receives the lower end surface of the lifting bar (91) at an intermediate height position on the back surface thereof, and is connected and fixed to the lower end of the lifting bar (91) by, for example, a rivet. It is
The lower end of the pressing member (93) is narrower than the upper portion thereof, and the lower end of the pressing member (93) comes close to or contacts the upper surface of the locking portion (721) of the locking member (72). It is made into a pressing part (931) to be positioned.

Next, an operation procedure for unlocking the telescopic leg member (6) by the lock mechanism (7) using the remote control mechanism will be described.
That is, when the upper operating lever (8) is grasped together with the first upper step (4C) with one hand and swung in the unlocking operation direction, the cam shaft (821a) moves forward on the cam surface (921). The slider (92), the lifting bar (91) and the pressing member (93) are thereby slid downward. Then, the pressing portion (931) of the pressing member (93) presses the upper surface of the locking portion (721) of the locking member (72), rotating the locking member (72) in the unlocking direction, and the rack is opened. The meshing (engagement) between the teeth (711) of (71) and the teeth (721a) of the locking portion (721) is released. As a result, the telescopic leg member (6) is slidable relative to the column (3), so that the telescopic leg member (6) can be telescopically extended by a required length.
When the upper operating lever (8) is released, the locking member (72) is rotated in the locking direction by the elastic force of the spring (73), and the teeth (721a) of the locking portion (721) engage with the rack ( 71) meshes with the teeth (711), and the telescopic leg member (6) is locked again. Further, due to the rotation of the locking member (72), the locking portion (721) presses the pressing portion (931) of the pressing member (93) upward. Accordingly, the slider (92), the lifting bar (91) and the pressing member (93) are slid upward, and the cam shaft (821a) is slid rearward on the cam surface (921). , thereby causing the upper operating lever (8) to swing away from the back surface of the first upper tread (4C). Since the spring elastic force of the lever return leaf spring (831) also acts on the swinging of the upper operating lever (8) in the above direction, the upper operating lever (8) quickly reaches the standby position when not operated. sure to go back.
As described above, according to the telescopic leg device (5) of this embodiment, the unlocking operation of the telescopic leg member (6) is performed at the first upper part located on the third stage from the bottom of the ladder body (2F) (2R). Since it is operated by the upper operating lever (8) provided on the back of the tread (4C), it can be easily carried out in a comfortable standing posture.
In addition to the above-described unlocking operation for the left and right telescoping leg members (6), the left and right telescopic leg members (6) can be unlocked individually by grasping the left and right upper operating levers (8) together with the first upper tread (4C) with one hand at the same time. It is also possible to unlock the telescopic leg members (6) at the same time, which is very convenient.
Furthermore, according to the telescopic leg device (5) of this embodiment, even when one of the ladder bodies (2F) of the ladder/stepladder (1) is turned upside down and used as a ladder, the upper operation lever (8) is Since it does not appear in front or on the top surface (tread) of the first upper tread (4C), there is no risk of interfering with the use of the ladder.

INDUSTRIAL APPLICABILITY The present invention is preferably used as a swing stopper for preventing the movement of an object to be prevented from moving .

(1): Ladder and stepladder
(2F): Front ladder body
(2R): rear ladder body
(3): Strut
(4A): Bottom tread
(4B): 2nd upper tread (2nd tread counted from the bottom)
(4C): 1st upper tread (3rd tread counted from the bottom)
(41): Fitting concave groove for hinge formation
(42): Third contacted portion
(5): Telescopic leg device
(6): Telescopic leg member
(61): Ground part
(7): Lock mechanism
(71): Rack (locked part)
(711): Tooth (of rack)
(72): locking member
(721): locking part
(73): Spring (biasing member)
(8): Upper operation lever (upper operation member)
(81): Lever body
(811a): Fitting ridge for hinge formation
(82): First end cap
(820): Swing stopper housing
(821): Arm
(821a): Camshaft (cam mechanism, upper interlocking mechanism)
(822): first contacted portion
(823): second contacted portion
(83): Second end cap
(831): Leaf spring for lever return (biasing member for lever return)
(84): Rotation stopper
(841): Insertion part (swing shaft)
(842): First contact part
(843): Second contact part
(844): Third contact part
(9): Transmission member
(91): lifting bar
(92): Slider
(921): Cam surface (cam mechanism, upper interlocking mechanism)
(922): Locked state retaining stopper
(10) (11): Bracket
(S): Clearances between the left and right ends of the lowest tread and the left and right ends of the second upper tread and each strut

Claims (5)

It is oscillatably provided on the movement-blocking object,
When the motion-preventing object is in the predetermined first posture, it swings in the first swinging direction due to its own weight and is arranged at the first position where the motion of the motion-preventing object is not blocked,
When the motion-preventing object is in the second posture that is upside down from the first posture, it swings in the second swinging direction opposite to the first swinging direction due to its own weight, thereby preventing the motion of the motion-preventing target. a rocking stop located in a possible second position; 2. The rocking stopper according to claim 1, wherein the movement-blocking object is an operating mechanism capable of unlocking the telescopic device by the locking mechanism. A first contact portion is provided on a side portion of the swing stopper on the first swing direction side,
When the rocking stopper rocks in the first rocking direction, the first abutting part is brought into contact with the first abutted part provided in the rocking stopper accommodating part of the object to be prevented from moving. , the rocking stopper is held at the first position,
A second contact portion is provided on a side portion of the swing stopper on the second swing direction side,
When the rocking stopper rocks in the second rocking direction, the second abutting part is brought into contact with the second abutted part provided in the rocking stopper accommodating part of the object to be prevented from moving. 3. A rocker stopper according to claim 1, wherein the rocker stopper is held in the second position. A third contact portion is provided at a portion of the swing stopper on the swing tip side,
When the swing stopper is at the second position, the third abutment portion abuts against the third abutted portion provided at a position facing the third abutment portion, thereby preventing the motion of the motion-preventing object. The rocking stopper according to any one of claims 1 to 3. The rocking stopper according to any one of claims 1 to 4, wherein the rocking stopper is flat and can rock about a rocking axis extending in its thickness direction.

Images