JP2021115988A - Stop device in caster - Google Patents

Abstract

To provide a stop device for preventing rolling of a wheel in a caster.SOLUTION: A stop device comprises: an arm (10) which is extended laterally from a wheel support body (1) that supports a wheel; a stop body (12) comprising a travel inhibition part (19) which is so made as to freely advance and retreat along the arm, comes into contact with a tread (3A) of the wheel by advancement, and is separated from the tread by retreat; a spring (17) which energizes the stop body in a retreat direction; and a control lever (13) which is pivoted to the arm (10) to be so made as to be rotatable between a resting posture (P1) and an operation posture (P2), and comprises cam means (31) which allows retreat of the stop body (12) when the same is so made as to be the resting posture (p1), and advances the stop body (12) when the same is so made as to be the operation posture (P2), thereby giving driving force that presses the travel inhibition part (19) against the tread (3A) of the wheel, to the stop body (12).SELECTED DRAWING: Figure 2

Description

The present invention relates to a restraining device for stopping a vehicle from traveling by blocking the rolling of wheels in casters used for various purposes.

Conventionally, a stopping device for stopping the caster from being unable to travel has been provided. For example, by rotating a pedal-type lever, the stopping plate is pressed against the tread of the wheel, and rolling is prevented by frictional resistance. It is generally configured as follows.

Japanese Unexamined Patent Publication No. 2001-260827 Japanese Unexamined Patent Publication No. 2008-290628

Casters are used for various purposes. For example, casters with jacks for columns in temporary scaffolding, casters for aerial work platforms, and other casters that support heavy structures, use a stop plate for the wheels. It is difficult to reliably stop the tread only by the frictional resistance that makes simple contact with the tread, and the tread may shift with respect to the stopping plate. If the wheels shift even a little, the support of the heavy structure becomes unstable, and there is a risk of causing a serious accident.

Further, for the purpose of enabling turning during traveling, casters in which a wheel support such as a fork member that pivotally supports the wheel is laterally rotatable or swingable around the vertical axis are generally provided. In order to safely support heavy structures such as temporary scaffolding and worktables at heights, it is desirable to prevent not only wheel rolling but also swinging at the same time.

As for the caster restraint device, there is a request to solve the above-mentioned problems, but a solution to this problem has not been proposed.

The present invention provides a restraint device in a caster that solves the above problems, and what the first invention constitutes as a means is a restraint device provided on a wheel support that pivotally supports a wheel in the caster. An arm extending laterally from the wheel support, and a restraining body having a traveling restraint portion that is freely advancing and retreating along the arm, comes into contact with the tread of the wheel by advancing, and separates from the tread by retreating. A spring that urges the restraining body in the retreating direction and a spring that is pivotally connected to the arm make it rotatable between the resting posture and the operating posture. It is composed of an operation lever provided with a cam means for applying a driving force for pressing the traveling restraint portion to the tread of the wheel by advancing the restraining body when the restraining body is in the posture, and the traveling restraint of the restraining body is provided. The portion is formed by providing a slit extending in the transverse direction of the tread of the wheel, and forming a forward blocking means and a reverse blocking means of the wheel by a parallel edge extending along the slit.

In the embodiment of the present invention, the caster is connected to the lower side of the mounting fixed body provided with the fixed receiving member by laterally rotatably connecting the wheel support supporting the wheels around the vertical axis. The body is provided with a rotation restraining portion that comes into contact with the fixed receiving member of the mounting fixed body by advancing and separates from the fixed receiving member by retreating, and rotates the operating lever so as to be in an operating posture. When the restraining body is advanced by the cam means, the rotation restraining portion is configured to be pressed against the fixed receiving member.

Preferably, the guide means is configured by inserting the restraint between the pair of arms constituting the arm and fitting recesses provided on both side edges of the restraint into the upper and lower edges of the arm. The restraint body is configured to be able to move forward and backward along the arm via the guide means.

In a preferred embodiment, the restraint connects a drive plate portion that is advanced against a spring by a cam means by bending a metal plate, and an upper portion of the drive plate portion and the rotation restraint portion. It is provided with an upper support plate portion, a lower support plate portion that connects the lower portion of the drive plate portion and the travel restraint portion, and the travel restraint portion extends downward from the lower support plate portion via a predetermined angle. A bent portion is formed between the travel restraint portion and the lower support plate portion, the restraint body is advanced along the arm by the cam means, the rotation restraint portion abuts on the fixed receiving member, and the travel restraint portion A control means for changing the angle of the bent portion so that the traveling restraint portion is along the tangent line of the tread by further applying a driving force by the cam means to the restraining body from the state where the wheel is in contact with the tread of the wheel. It is configured.

According to the present invention, it is possible to provide a restraining device that exerts an excellent restraining effect by reliably blocking the rolling of the wheels.

Further, according to the present invention, it is possible to provide a restraining device capable of stopping the lateral rotation or swinging rotation of the wheel support at the same time as stopping the rolling of the wheel.

It is a side view which shows the caster equipped with the stop device which concerns on one Embodiment of this invention. It is a perspective view which shows the restraint device in the disassembled state. The operation of the restraint device is shown, (A) is a side view showing the restraint release state in a cross section, and (B) is a side view showing the restraint action state in a cross section. The cam means of the operating lever are shown. FIG. FIG. 3C is an explanatory view of the cam means when the operating lever is in the operating posture. The action of the restraining device is shown, (A) is a cross-sectional view showing the action when the operating lever is in the resting posture, and (B) is a cross-sectional view showing the action when the operating lever is rotated toward the operating posture. , (C) are cross-sectional views showing the operation when the operating lever is in the operating posture. The state when the restraint device is operated is shown, (A) is a perspective view showing the caster and the restraint device, and (B) is an enlarged cross-sectional view showing the relationship between the rotation restraint portion and the tread of the wheel.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the caster pivotally supports the wheel 3 on the forks 1a and 1a of the wheel support 1 via the axle 2, and the wheel support 1 is the lower side of the mounting fixed body 4. As shown by the arrow M in the figure, they are connected to each other via a center axis (not shown) so as to be rotatable laterally or swingable around the vertical axis.

In the case of the illustrated example, the wheel 3 forms a center portion 3a which is medium and high in the width direction of the tread 3A. The tread 3A is preferably made of a tire molded from an elastic material, but may be integrally molded with the same material as the wheel 3.

The illustrated embodiment illustrates a caster with a jack for a support in a temporary scaffold, and the mounting fixing body 4 has a support nut 7 screwed into a screw shaft member 6 erected from a fixing seat 5, and a handle 8 is used. A scaffolding support (not shown) is externally attached to the screw shaft member 6 in a state where the support nut 7 is positioned at a predetermined height position of the screw shaft member 6 by rotating the support nut 7 and the lower end of the support nut is attached to the support nut. It is configured to be supported by 7. However, it goes without saying that the present invention is not limited to the illustrated embodiment, and the mounting fixed body 4 may be mounted and fixed to an article that requires casters.

Therefore, the restraining device according to the embodiment of the present invention is located at the base end portion of the forks 1a and 1a and the fixing receiving member 9 made of a flange plate fixed to the fixing seat 5 of the mounting fixing body 4. It is composed of metal plate arms 10 and 10 extending laterally from the wheel support 1, a spring unit 11, a restraining body 12, and an operating lever 13, and is inside the upper portion of the arms 10 and 10. Is provided with a plate-shaped locking portion 14.

(Spring unit)
The spring unit 11 connects the horizontal plate portions 15 and 15 inserted along the inside of the arms 10 and 10 with the insertion end portions of the horizontal plate portions 15 and 15 by bending the metal plate. The connecting plate portion 16 is integrally formed. A spring 17 made of a coil spring is arranged between the horizontal plate portions 15 and 15, and the end portion of the spring 17 in the insertion direction is fitted into the boss portion 16a provided on the connecting plate portion 16. It is fixed by.

The horizontal plate portions 15 and 15 are provided with holes 15a that match the pivot holes 10a formed in the arms 10 and 10 in a state of being inserted along the inside of the arms 10 and 10, and are composed of bolts and nuts. The pivot 18 is inserted through these holes and attached to the shaft. In the case of the illustrated embodiment, the locking claws 15b having a hook shape are formed on the upper edges of the horizontal plate portions 15 and 15 in the insertion direction, and the locking claws 15b are engaged with the locking portions 14. By stopping, the horizontal plate portion 15 is fixed so as not to rotate around the pivot axis 18.

(Stop body)
It is mounted between the restraining body 12 and the horizontal plate portions 15 and 15 of the spring unit 11, is configured to be able to move forward and backward along the arms 10 and 10, and comes into contact with the tread 3A of the wheel 3 when advanced. A traveling restraint portion 19 that separates from the tread when the track is retracted and a rotation restraint portion 20 that contacts the fixed receiving member 9 when the track is advanced and is separated from the fixed receiving member when the track is retracted. It is provided.

In the case of the illustrated embodiment, the restraint body 12 has a drive plate portion 21 that is brought into contact with the spring 17 by bending one metal plate, an upper portion of the drive plate portion 21, and the rotation restraint portion. It includes an upper support plate portion 22 that connects 20 and a lower support plate portion 23 that connects the lower portion of the drive plate portion 21 and the travel restraint portion 19.

At this time, the rotation restraint portion 20 and the travel restraint portion 19 are formed by bending the metal plate, and as shown in FIG. 2, the rotation restraint portion 20 is a fixed receiver made of a circular flange plate. It is curved in an arc shape along the peripheral edge of the member 9. On the other hand, the traveling stop portion 19 is formed in a flat plate shape so as to cover the tread 3A including the center portion 3a, and is provided with a slit 24 extending in the transverse direction of the tread 3A.

The travel restraint portion 19 extends downward from the lower support plate portion 23 in a folded state via a predetermined angle θ1, and therefore is folded between the travel restraint portion 19 and the lower support plate portion 23. The curved portion 25 is formed.

The restraining body 12 is located between the pair of arms 10 and 10 and is mounted inside the horizontal plate portions 15 and 15, and the upper and lower edges of the arms 10 and 10 are placed on both sides of the drive plate portion 21. The recesses 26a and 26a that are fitted to the portions are formed, thereby forming a guide means 26 that guides the restraining body 12 in an advancing and retreating manner along the arm.

(Operating lever)
The operating lever 13 is formed of a pair of strip-shaped metal plates arranged side by side, and constitutes lever portions 27, 27 arranged side by side at wide intervals and drive units 28, 28 arranged side by side at narrow intervals. The lever portions 27, 27 are connected and fixed by the connecting rod 29, and the driving portions 28, 28 are connected and fixed by the locking rod 30.

The drive portions 28, 28 are located between the pair of arms 10, 10 and are inserted inside the horizontal plate portions 15, 15, and the shaft support holes matching the pivot holes 10a and the holes 15a. 28a is provided, and by pivotally supporting the operating lever 13 with the pivot 18 via the shaft support hole 28a, the operating lever 13 is pivotally supported so as to be rotatable between the resting posture P1 and the operating posture P2. A cam means 31 is provided on the tip end side of the drive unit 28 extending beyond the shaft support hole 28a.

Therefore, the restraining body 12 is always elastically urged in the backward direction by the spring 17, the drive plate portion 21 is in contact with the cam means 31 of the operating lever 13, and the operating lever 13 is moved from the resting posture P1 to the operating posture P2. The cam means 31 pushes the drive plate portion 21 to move the restraining body 12 forward when the cam means 31 rotates toward the vehicle.

(Action)
As shown in FIG. 3A, when the operating lever 13 is in the obliquely upward resting posture P1, the locking rod 30 is a notch-shaped receiver formed between the end edge and the upper edge of the arm 10. It comes into contact with the portion 10b and prevents the operating lever 13 from rotating in the upright posture direction (counterclockwise direction in the drawing). At this time, the cam means 31 allows the restraining body 12 to retract by the spring 17, whereby the traveling restraining portion 19 is separated from the tread 3A of the wheel 3 and the rotation restraining portion 20 is separated from the fixed receiving member 9. It is separated from. That is, the casters are not stopped, the wheels 3 can freely roll and travel freely, and the wheel support 1 can rotate sideways or swing with respect to the mounting fixed body 4. Has been done. In this state, the drive plate portion 21 of the restraining body 12 urged in the backward direction by the spring 17 is in contact with the cam means 31, thereby holding the operating lever 13 in the resting posture P1.

As shown in FIG. 3B, when the operating lever 13 is set to the operating posture P2 in an obliquely downward direction, the cam means 31 advances the restraining body 12 against the spring 17, and the rotation restraining portion 20 is fixed to the receiving member. 9 is pressed to prevent the wheel support 1 from laterally rotating or swinging, and at the same time, the traveling stop portion 19 is pressed against the tread 3A of the wheel 3, thereby causing the wheel 3 to roll. Stop and make it impossible to drive.

The user can manually rotate the operating lever 13 between the resting posture P1 and the operating posture P2, but the lever portions 27, 27 arranged side by side separated by the connecting rod 29 are used as pedals. It can also be done by foot movement.

(Cam means)
FIG. 4 shows a preferred embodiment of the cam means 31. The cam means 31 is located on the outer periphery centered on the shaft support hole 28a, and is linear along the drive plate portion 21 of the restraint body 12 when the operation lever 13 is in the resting posture P1 as shown in FIG. 4 (A). As shown in FIG. 4C, the resting portion 31A, the actuating portion 31B formed in a straight line along the drive plate portion 21 of the restraint body 12 when the operating lever 13 is set to the operating posture P2, and the resting portion 31 An intermediate portion 31C is formed between the 31A and the operating portion 31B.

With respect to the radial distance from the center of the shaft support hole 28a, the resting portion 31A is formed at the position defined as the shortest distance R1, and the operating portion 31B is formed at the position defined as the longest distance R2. The intermediate portion 31C is formed so that the rest portion 31A and the operating portion 31B are continuously connected by an arc.

As shown in FIG. 4A, when the resting posture P1 is set, the drive plate portion 21 of the restraining body 12 urged in the backward direction by the spring 17 makes line contact or surface contact with the resting portion 31A, so that the operating lever 13 is held so as not to rotate easily, and the resting posture P1 is maintained (see FIG. 3A).

As shown in FIG. 4B, when rotating from the resting posture P1 to the operating posture P2, the drive plate portion 21 is gradually advanced against the spring along the arc of the intermediate portion 31C and rotates. The restraint portion 20 is pressed against the fixed receiving member 9, and the traveling restraint portion 19 is pressed against the tread 3A of the wheel 3.

When the operating posture P2 is set as shown in FIG. 4C, the operating portion 31B is operated by line contact or surface contact with the drive plate portion 21 while the above-mentioned forward state of the drive plate portion 21 is maintained. The lever 13 is held so as not to rotate easily, and the operating posture P2 is maintained (see FIG. 3B). At this time, as shown in FIG. 3B, the traveling stop portion 19 is pressed against the tread 3A along the tangent line T of the tread 3A of the wheel 3.

(Structure and action of bent part)
As shown in FIG. 5A, when the restraining body 12 is retracted by the spring 17 with the operating lever 13 in the resting posture P1, the bent portion 25 holds a predetermined angle θ1. Therefore, as shown in FIG. 5B, when the operating lever 13 is rotated toward the operating posture P2, the drive plate portion 21 is advanced by the intermediate portion 31C of the cam means 31. Preferably, the rotation restraining portion 20 comes into contact with the fixed receiving member 9 and the traveling stopping portion 19 comes into contact with the tread 3A before the end of the intermediate portion 31C (the starting end of the operating portion 31B) comes into contact with the drive plate portion 21. It is configured in. Therefore, from this state, when the end of the intermediate portion 31C comes into contact with the drive plate portion 21 due to the rotation of the cam means 31, the drive plate portion 21 is further pushed in the forward direction.

Therefore, as shown in the drawing, the drive plate portion 21 is bent and the bent portion 25 is bent so as to have an angle θ2 (θ2 <θ1). This bending does not remain as a permanent strain, but is caused by the flexibility or elasticity of the metal plate, and is immediately restored when the restraining body 12 is retracted by returning the operating lever 13 to the resting posture P1. The flexible or elastic repulsive force makes it possible to strongly press the traveling restraint portion 19 against the tread 3A.

In this way, the bent portion 25 constitutes the control means 32 that changes from the angle θ1 to the angle θ2, whereby, as shown in FIG. 5C, the operating lever 13 is rotated to the operating posture P2. The traveling restraint portion 19 pressed against the tread 3A of the wheel 3 while being moved and held is configured to be suitably along the tangent line T of the tread 3A.

(Structure and action of slit)
As shown in FIG. 6B, the traveling restraint portion 19 pressed along the tangent line T of the tread 3A is configured to press the slit 24 toward the line D in the centripetal direction orthogonal to the tangent line T. ing.

Therefore, the parallel edge portion along the slit 24 is configured to bite into the surface of the tread 3A to increase the frictional resistance, and the pair of parallel edges is provided with the forward rotation blocking means 24a that opposes the forward rotation F of the wheel 3. , The reverse rotation prevention means 24b that opposes the reverse rotation B is formed.

Moreover, when the wheel 3 provided with the center portion 3a which is set to be medium and high in the width direction of the tread 3A is used, as a result of the forward blocking means 24a and the reverse blocking means 24b biting into each other, the meat portion of the center portion 3a is formed by the slit 21. Since the bulging meat portion 3b is generated by entering the inside, the frictional resistance is further increased, and the rolling of the wheel 3 is surely prevented so as not to cause any deviation movement.

In the case of the illustrated example, the slit 24 is formed of a slot-shaped elongated hole penetrating the traveling stop portion 19, but is not limited to this, and is composed of a bottomed concave elongated groove formed by cutting or pressing. You may. Further, two ribs parallel to the traveling stop portion 19 may be provided so as to form a slit 24 by the space between the ribs.

1 Wheel support 1a Fork 2 Axle 3 Wheel 3A Tread 3a Center part 3b Bulging part 4 Mounting fixing body 5 Fixed seat 6 Screw shaft member 7 Support nut 8 Handle 9 Fixed receiving member 10 Arm 10a Pivot hole 10b Receiving part 11 Spring unit 12 Stopper 13 Operating lever 14 Locking part 15 Horizontal plate part 15a Hole 15b Locking claw 16 Connecting plate part 16a Boss part 17 Spring 18 Pit shaft 19 Traveling stop part 20 Rotation stop part 21 Drive plate part 22 Upper support Plate 23 Lower support Plate 24 Slit 24a Forward blocking means 24b Reverse blocking means 25 Bending section 26 Guide means 26a Recess 27 Lever section 28 Drive section 28a Shaft support hole 29 Connecting rod 30 Locking rod 31 Cam means 31A Resting section 31B Intermediate part 31C Acting part 32 Control means

Claims (4)

It is a restraining device provided on the wheel support (1) that supports the wheels on the casters.
An arm (10) extending laterally from the wheel support (1),
A restraining body (12) provided with a traveling restraint (19) that is free to move forward and backward along the arm, comes into contact with the tread (3A) of the wheel by moving forward, and separates from the tread by moving backward.
A spring (17) that urges the restraining body in the backward direction, and
By being pivotally connected to the arm (10), it is made rotatable between the resting posture (P1) and the operating posture (P2), and when the resting posture (P1) is set, the restraining body (12) is retracted. A cam that gives a driving force to the restraint (12) to press the traveling restraint (19) against the tread (3A) of the wheel by advancing the restraint (12) when the working posture (P2) is set. It consists of an operating lever (13) with means (31).
The traveling stop portion (19) of the stop body is provided with a slit (24) extending in the transverse direction of the tread of the wheel, and the parallel edge extending along the slit prevents the wheel from moving forward (24a) and from moving backward. A restraining device in a caster, characterized in that it is formed by forming means (24b). In a caster formed by connecting a wheel support (1), which supports a wheel on an axis, laterally rotatably around a vertical axis under a mounting fixed body (4) provided with a fixed receiving member (9). It is a restraining device installed on the wheel support.
The restraining body (12) is provided with a rotation restraining portion (20) that comes into contact with the fixed receiving member (9) of the mounting fixed body by advancing and separates from the fixed receiving member by retreating.
When the operation lever (13) is rotated so as to be in the operating posture (P2) and the restraining body (12) is advanced by the cam means (31), the rotation restraining portion (20) is fixedly received. The restraining device in a caster according to claim 1, wherein the member (9) is configured to be pressed against the member (9). The restraint body (12) is inserted between the pair of arms (10, 10) constituting the arm, and recesses (26a) provided on both side edges of the restraint body are fitted to the upper and lower edges of the arm. The caster according to claim 1 or 2, wherein the guide means (26) is formed by the above means, and the restraint body is configured to be able to move forward and backward along the arm via the guide means. Stop device. The restraining body (12) has a drive plate portion (21) that is advanced against a spring by the cam means (31) by bending a metal plate, and an upper portion of the drive plate portion and the rotation thereof. The traveling restraint portion (22) is provided with an upper support plate portion (22) connecting the restraining portion (20) and a lower support plate portion (23) connecting the lower portion of the driving plate portion and the traveling restraining portion (19). A bent portion (25) is formed between the traveling restraint portion and the lower support plate portion so that 19) extends downward from the lower support plate portion (23) via a predetermined angle.
The cam means (31) advances the restraint body (12) along the arm, the rotation restraint portion (20) abuts on the fixed receiving member (9), and the travel restraint portion (19) is a wheel tread (3A). ), And by further applying the driving force by the cam means (31) to the restraining body (12), the traveling restraining portion (19) is bent so as to be along the tangent line (T) of the tread. The restraint device in a caster according to claim 2 or 3, wherein the control means (32) for changing the angle of the unit (25) is configured.

Images