JP2007331554A - Caster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a caster to enable a lock operation by changing over between a braking/turning lock and a turning lock. <P>SOLUTION: This caster consists of a fixed bedplate, a cam support part journaling a rotary shaft of an input cam member, an operation member connected to the rotary shaft and extending outward, a first lever piece vertically lifting/lowering its tip by the displacement of the input cam member, a transmission shaft repulsively pushed down by the lowering of the tip of the first lever piece, a braking lock member downward displaced by the lowering of the transmission shaft, pushing a brake shoe to a wheel and braking it, a turning lock piece having a piece with an engagement projection part pushed up by the braking lock member, a first turning lock receiving part engaged with the engagement projection part and restricting the turning of a support yoke, a second lever piece having a tip vertically moving by the displacement of the input cam member to the turning lock cam face, and a second turning lock receiving part fixed to the support yoke and engaging the tip of the second lever piece. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a caster lock structure that can be switched between neutral, turning restriction, and braking / turning restriction.

The present applicant has already disclosed the configuration of Japanese Patent Application Laid-Open No. 2002-264604 as a configuration for simultaneously performing braking and turning control of casters. In this configuration, the input cam is arranged on the transmission shaft and the input cam is used. Since the transmission shaft is directly pushed down, it is necessary to provide a space for placing the input cam above the transmission shaft, and the total height of the caster is increased, and a plate-type swivel caster with a flat fixed base plate Could not be applied.
Further, in the above configuration, since braking and turning regulation are performed at the same time, it is impossible to make the wheel travelable only by turning regulation.
JP 2002-264604 A

  The present invention has been made in view of the above circumstances, and its main problem is that a plate-type swivel caster having a fixed base plate can be switched between a swivel restriction and a braking / turning restriction to be locked. It is to provide a caster provided with a mechanism.

In order to solve the above problem, the invention of claim 1
A fixed base plate that pivotally supports a support yoke that pivotally supports a wheel and that is fixed to a mounted body, and a cam support portion that is provided below the fixed base plate and pivotally supports a rotation shaft of an input cam member. A neutral cam surface provided on the input cam member, a braking / swivel lock cam surface continuously provided on one side with the cam surface as a center, and a swing lock surface provided on the other side. A cam surface, an operating member connected to the rotation shaft of the input cam member and extending outward, and pivotally attached to the cam support portion, and the input cam member is displaced to a braking / turning lock cam surface. The first lever piece that raises and lowers the tip up and down, and is inserted into the attachment base of the substantially cylindrical body that is fixed to the fixed base plate and is inserted into the support yoke so as to be raised and lowered. A transmission shaft that is pushed down so as to be repelled by lowering the tip; A braking lock member that is pivotally attached to the support yoke below the transmission shaft, and that has one end pivotally displaced downward by the lowering of the transmission shaft and presses the brake shoe provided at the lower portion against the tread surface of the wheel to brake the wheel. And a turning lock piece having a piece provided with an engaging projection pushed up by the pivot of the braking lock member, and a first fixed to the fixed base plate. A first turning lock receiving portion which is provided on the receiving portion member and engages the engaging protrusion of the turning lock piece to restrain the turning of the support yoke, and the input cam member is displaced to the turning lock cam surface. A second lever piece whose tip is moved up and down, and a second turning lock receiving portion which is provided on a second receiving member fixed to the support yoke and engages the tip of the second lever piece. Features.
In the invention of claim 2,
The second receiving part member is composed of a receiving part fixed to the lower end of a substantially cylindrical mounting base fixed at the upper part to the fixed base plate and fitted into the support yoke, and is formed of a concave part opening downward. 1 turning lock receiving part is formed,
The first receiving part member is composed of an upper plate part fixed together with a support yoke to a bearing case part that rotates integrally with the outer ring of the bearing part that is externally fitted to the mounting base part, and includes a concave part that opens upward. A two-turn lock receiving portion is formed.
In the invention of claim 3,
The input cam member forms a braking / swivel locking cam surface in one of the rotational directions adjacent to the neutral cam surface, and the rotational locking cam in the other rotational direction adjacent to the neutral cam surface. It is characterized by forming a surface.
In the invention of claim 4,
The operation member is formed of a single operation lever that is fixed to the rotation shaft of the input cam member and can rotate the rotation shaft.
In the invention of claim 5,
The operating member is provided in parallel on the left and right, and is connected to the rotating shaft of the input cam member via the first clutch mechanism, and the first operating lever is connected to the rotating shaft via the second clutch mechanism. And the second operating lever connected in an intermittent manner, and by operating the first operating lever, the rotational shaft of the input cam member is rotationally displaced from the neutral position to the braking / swivel lock position, and the second operating lever The rotation shaft of the input cam member is reversely displaced from the neutral position to the turning lock position by an operation.
In the invention of claim 6,
A pair of upper and lower operation members are provided side by side on the left and right, and are formed integrally with a first gear that is integrally attached to the rotation shaft of the input cam member so that the rotation shaft can be rotated. 1 control lever,
The rotating shaft is formed integrally with a second gear that is attached to an auxiliary rotating shaft that is spaced apart below the rotating shaft and meshes with the first gear at the upper or lower position via the first gear. And a second operation lever that can be rotated.
Furthermore, in the invention of claim 7,
A first operating lever and an interlocking member are provided side by side on the rotating shaft; a second operating lever is provided on the auxiliary rotating shaft;
The second operation lever includes a second gear portion that meshes with a first gear portion formed on the first operation lever, and a fourth gear portion that meshes with a third gear portion formed on the interlocking member. It is characterized by being.

As described above, since the transmission shaft is built in the caster as described above, it is not necessary to set the total height of the caster high, and the caster can be used in the same manner as a normal caster. It can be useful.
Further, by providing the operation member, the rotation shaft of the input cam member can be easily operated, which is extremely convenient.

Embodiments of the present invention will be described below with reference to the drawings.
Here, front and rear will be described based on a caster in a running posture, with the left side in FIG. 1 as the front and the right side as the rear.

[overall structure]
As shown in FIGS. 1 to 6 and FIGS. 8 to 10, the caster 1 includes a fixed base plate 2 that supports a support yoke 3 that pivotally supports a wheel 4 and that is fixed to an attached body. is doing.
On the fixed base plate 2, a cam support portion 6 that supports the rotating shaft 50 of the input cam member 5 is fixed below the fixed base plate 2.
Further, the rotating shaft 50 of the input cam member 5 extends outwardly and is connected to an operation member 7 described later.

A first lever piece 8 that pivots the tip up and down by the displacement of the input cam member 5 is pivotally attached to the cam support portion 6 by a first pin P1.
The caster 1 includes a transmission shaft 9 that is pushed down so as to be repelled when the tip of the first lever piece 8 pivots downward.
As the transmission shaft 9 is lowered, the brake lock member 40 that pivots is pivotally attached to the support yoke 3 by the third pin P3.
One end of the brake lock member 40 is displaced downward, and the brake shoe 41 can be pressed and locked against the tread surface of the wheel 4.

Further, there is provided a turning lock piece 60 whose other end is displaced upward by the pivot of the brake lock member 40 and is pushed up so as to be returned.
Since the turning lock piece 60 is provided with an engaging protrusion 63, a first turning lock is formed in which the engaging protrusion 63 is formed integrally with the fixed base plate 2 by the pivot of the braking lock member 40. Engage with the receiving portion 31 to restrain the turning.

Also, below the input cam member 5, a second lever piece 20 that pivots due to the displacement of the input cam member 5 and whose tip moves up and down is pivotally attached to the cam support portion 6 by a second pin P2. Yes.
Then, by pivoting the second lever piece 20, only the turning can be locked by engaging the second lever piece 20 with the second turning lock receiving portion 32 provided integrally with the support yoke 3.

[Fixed base plate]
The fixed base plate 2 is formed with a recess 2A at substantially the center, a circular hole is formed at the center of the recess 2A, and the upper portion of the mounting base 10 is fitted and fixed.
The fixing base 2 is fixed to a body to be attached (not shown) by screwing or the like, and the caster 1 is attached.

[Cam support part]
A cam support 6 is fixed to the fixed base plate 2 on the back surface behind the casters 1 in the traveling direction.
In the illustrated example, the cam support portion 6 includes a support portion main body 6a having a channel-shaped cross section and a pair of bracket pieces 6b that are bent outward at the upper end of the support portion main body 6a and fixed to the fixed base plate 2. ing.
A rotating shaft 50 of the input cam member 5 is pivotally supported at the rear center on the left and right side plates of the support body 6a.

Further, a second pin P2 serving as a pivot fulcrum of the second lever piece 20 is attached to the front thereof, and a first pin P1 serving as a pivot fulcrum of the first lever piece 8 is attached to the front upper side thereof. ing.
Further, a long hole 6c is formed in the bottom plate of the support portion main body 6a to restrict the movable range of the latch piece 21 bent below the second lever piece 20.

[First lever piece]
The first lever piece 8 has a substantially plate shape, and the first pin P1 is fitted in a mounting hole 8c provided at a midway position, and the power point is the rear (right side in the figure) in the caster traveling direction. The side 8a is disposed so as to contact the upper portion of the input cam member 5.
A midway portion that extends beyond the fulcrum position of the first lever piece 8 and continues to the action point side protrudes from an opening 2a formed in the peripheral wall of the recess 2A provided at the approximate center of the fixed base plate 2, and will be described later. It extends so that the pressurization part 8b used as an action point may contact | connect the head 9a of this transmission shaft 9.
The first lever piece 8 is urged in the unlocking direction, which is the clockwise direction in the figure, by the transmission shaft 9 urged upward by the pressurizing portion 8 b, and the force point side 8 a collides with the input cam member 5. Match.

[Second lever piece]
The second lever piece 20 has a substantially plate shape, and its rear end (right side in the figure) is bent to form a latching portion 21. Further, a bracket 22 is provided in the middle position and pivotally attached to the second pin P2.
The second lever piece 20 has a torsion spring 25 in which an annular portion is fitted around the second pin P2, one arm is hooked on the first pin P1, and the other arm is hooked on the second lever piece 20. As a result, the end 23 serving as the action point is urged in the locking direction, which is counterclockwise in the figure, and the force point side is in contact with the input cam member 5.

[Cam members for input]
As shown in FIG. 7, the input cam member 5 includes mountain-shaped first to fourth cam surfaces 51 to 54, and a pair of first and second projecting surfaces 55 formed on both sides of the cam surface. 56, a concentric arc part 57 provided continuously with the second projecting surface 56, and a projecting piece part 58 projecting from the end of the arc part 57 and continuing to the first projecting surface 55.

[Supporting yoke]
An upper portion of a support yoke 3 that pivotally supports a wheel 4 is attached to the fixed base plate 2 via a mounting base 10 so as to be rotatable.
A braking / turning restriction mechanism is built in the upper hollow of the support yoke 3 on the wheel 4. Although FIGS. 1 to 5 and FIGS. 8 to 10 have different support yokes, the invention is not particularly limited.

[Mounting base]
As shown in FIG. 6, the mounting base 10 has a substantially cylindrical body, the upper end is bent outward to fix the fixing base 2, and the lower end is bent outward to fix the tray 15. .
In other words, the mounting base 10 fixes the inner ring side of the radial bearing portion 12 between the fixed base portion 2 and the tray portion 15 via a spacer as necessary.

The saucer portion 15 is fixed integrally with the fixed base plate 2 via the mounting base portion 10, and has a first turning lock receiving portion 31 formed of a concave portion that opens downward.
An engagement protrusion 63 formed on a piece 61 above a spring material 60 as an example of a later-described turning lock piece can be inserted into the first turning lock receiving portion 31.
Further, a bearing case portion 14 is fixed to the outer ring side of the bearing portion 12, and an upper plate portion 13 that opens upward and an upper end portion of the downward support yoke 3 are fitted on the upper portion of the bearing case portion 14. It is fixed.

Accordingly, the upper plate 13 is integrated with the support yoke 3 via the bearing case portion 14 and is pivotably attached to the fixed base plate 2 and the mounting base 10 via the bearing portion 12.
And the upper plate part 13 has the 2nd turning lock | rock receiving part 32 which consists of a recessed part opened upwards.
The second turning lock receiving portion 32 is configured such that an end portion 23 on the left side in the drawing of the second lever piece 20 can enter.

[Transmission shaft]
A transmission shaft 9 is fitted into the through hole 11 at the center of the mounting base 10 so as to be slidable in the vertical direction.
Here, the through-hole 11 has an enlarged diameter portion 11a whose upper opening diameter is expanded with respect to the lower portion, and a coil spring 16 is attached to the transmission shaft 9 in the gap between the transmission shaft 9 and the enlarged diameter portion 11a. The outer ends of the coil spring 16 are fitted to each other with a slight gap between them, and the upper end of the coil spring 16 is abutted against the head 9 a of the transmission shaft 9.

The transmission shaft 9 is formed with a bowl-shaped head portion 9a in contact with the pressurizing portion 8b of the first lever piece 8 at the upper end, and the lower end has a cylindrical shape formed in a substantially hemispherical shape.
The transmission shaft 9 is urged upward by a coil spring 16 and is pressed from above by the pressing portion 8 b of the first lever piece 8.
is doing.

[Swivel lock member]
The swivel lock member 40 has a brake shoe 41 at the lower portion, and is composed of a pivoting body pivotally attached at a midway position closer to the rear by a third pin P3 attached to the support yoke 3.
A spherical recess 42 for receiving the lower end 9b of the transmission shaft 9 is formed in the upper part, and pivots about the third pin P3 as a fulcrum in conjunction with the elevation of the transmission shaft 9.
Reference numeral 43 denotes an adjustment screw for finely adjusting the position of the brake shoe 41.

[Spring lock spring material]
The turning lock spring material 60 is made of a spring material having a shape like an open split pin, and an annular portion 65 of a bent portion is externally fitted to a fourth pin P4 fixed to the support yoke 3. The rear portion 42 of the turning lock member 40 is fitted between the pieces 61 and 62.
That is, the tip of the lower piece 62 is latched at a midway position below the turning lock member 40, and the upper piece 61 is in contact with the upper portion of the rear portion 42 of the turning lock member 40. The member 40 tilts about the third pin P3 as a fulcrum, so that the space between the lower piece S2 and the upper piece 61 can be expanded and contracted, and the upper piece 61 can be displaced from the inclined posture to the substantially horizontal posture. It is like that.

Then, at a substantially horizontal position, the engaging projection 63 provided on the upper piece 61 enters the second turning lock receiving portion 32, and the movement of the tray 15 and the support yoke 3 is restricted to lock the turning. Can do.
At the same time, the brake shoe 41 provided on the front side of the braking lock member 40 pushed down by the spherical lower end 9 b of the transmission shaft 9 presses the tread surface of the wheel 4 to brake the wheel 4. Can do.

[neutral]
Next, the operation of the caster locking device will be described.
First, the neutral that can run and turn freely without any lock will be described.
In the case of neutral without braking or turning restriction, the second cam surface 52 of the input cam member 5 abuts against the power point side (right side in the figure) of the first lever piece 8 as shown in FIG. The point side (left side in the figure) holds the transmission shaft 9 in a standby position where it does not push down.
At the same time, the top of the second projecting surface 56 of the input cam member 5 pushes down the force point side (right side in the drawing) of the second lever piece 20, and the end 23 on the action point side extends from the recess of the second turning lock receiving portion 32. It is held at a released release position.

[Brake / swivel lock state]
Next, when performing braking and turning lock, as shown in FIG. 9, the rotating shaft 50 is rotated, and the third cam surface 53 of the input cam member 5 is on the power point side of the first lever piece 8 (right side in the figure). Is pushed up to lower the pressure part 8b side.
Due to the tilting of the first lever piece 8, the transmission shaft 9 slides downward along the through hole 11 of the mounting base 10, and the brake lock member 40 pivotally attached to the support yoke 3 side is pushed down in the direction of the wheel 4, The brake shoe 41 provided on the front end side of the brake lock member 40 is pressed against the tread surface of the wheel 4 to brake the wheel 4.

Further, the tilting of the brake lock member 40 pushes up the upper piece 61 of the turning lock spring material 60 that urges the brake lock member 40 in the brake release direction by the upward movement of the base end side thereof.
As described above, the engaging protrusion 63 is formed on the upper piece 61 of the turning lock spring material 60 to form a turning lock piece, and the second turning formed on the lower surface of the tray 15. The lock receiving portion 32 is fitted to restrict the turning of the support yoke 3 along with the braking of the wheel 4.

At the same time, the arc portion 57 of the input cam member 5 is in contact with the power point side (right side in the drawing) of the second lever piece 20 to hold the second lever piece 20 in the unlocked inclined posture.
At this time, since the projecting piece 58 abuts with the lower rear end of the cam support 6, the rotation of the input cam member 5 in the clockwise direction in the figure is restricted.

  As described above, by switching the input cam member 5, the caster is placed in three states: a neutral state in which turning control and braking are not performed, a turning lock in which only turning control is performed, and a braking and turning lock in which braking and turning control are performed simultaneously. Can be controlled.

[Rotation lock state]
Next, when performing the rotation lock, as shown in FIG. 10, the rotary shaft 50 is rotated, and the first cam surface 51 of the input cam member 5 is adjacent to the first projecting surface 55 which forms a step portion. The first lever piece 8 is abutted against the power point side 8a to hold the pressurizing portion 8b on the acting point side of the first lever piece 8 at a standby position where the transmission shaft 9 is not pushed down.

At this time, the corner portion between the second cam surface 52 and the first cam surface 51 does not protrude greatly from the center of the input cam member 5, so that the corner portion is slightly increased when the input cam member 5 rotates. Although the transmission shaft 9 is pushed down, the brake shoe 41 does not contact the wheel 4.
At the same time, the fourth cam surface 54 of the input cam member 5 faces the power point side (right side in the drawing) of the second lever piece 20, so that the power point side of the second lever piece 20 rises by the urging force, and the fourth cam surface 54 And a second projecting surface 56 that forms a step portion adjacent to this abuts against the force point side (right side in the drawing) of the second lever piece 20, and the end 23 on the action point side is the first turning lock receiving portion 31. Is held in the swivel lock position immersed in the recess.

[Operation member]
The operation member for operating the input cam member 5 is configured such that the neutral position is at the center, the brake / turning lock position is set when moved to one side from the neutral position, and the turn lock position is set when moved to the other.
FIGS. 11 and 12 include a single operation lever 100 having a base end fixed to the rotation shaft 50 of the input cam 5.
The operation lever 100 includes a flat pedal portion 101, side plate portions 103 provided on the left and right sides of the pedal portion 101, and a pair of large-diameter disk-shaped flange portions 104 provided at the distal ends of the side plate portions 103. And a shaft attachment portion 102 which is formed between the flange portions 104 and is fitted on and fixed to the rotary shaft 50.

  On the other hand, a pair of left and right brackets 105 project downward from behind the fixed base plate 2 and pivotally support the rotary shaft 50. Therefore, the rotary shaft 50 is rotated by tilting the pedal portion 101 up and down. Can be made.

Since the operation lever 100 is configured as described above, the intermediate position of the operation lever 100 is the neutral position (A) of the input cam 5 in FIG. 12, and when the pedal 101 is depressed, the input cam 5 is moved clockwise (a Direction) and can be displaced to the braking / swivel lock position (b).
Further, when the operation lever 100 is lifted from the neutral position (A), the input cam 5 can be rotated counterclockwise (direction b) in the figure to be displaced to the turning lock position (C).
Further, the input cam 5 can be displaced to the original neutral position (A) by depressing or kicking up the operation lever 100 from the respective lock position to an intermediate position.

  In the present invention, the operation member may control one caster 1 or may control a plurality of spaced casters simultaneously. In the latter case, the rotation shaft 50 of each caster 1 may be a single coaxial rotation shaft, and one operation member may be provided on the rotation shaft. In this case, the operation member may be disposed on the casters 1 or on the rotation shaft between the casters 1.

The operation members of different embodiments shown in FIGS. 13 and 15 have a structure in which the rotation shaft 50 of the input cam 5 is individually operated by the first operation lever 110 and the second operation lever 120 arranged substantially horizontally on the left and right. It has become.
The rotary shaft 50 is connected to the first operation lever 110 or the second operation lever 120 via a two-way cam and a clutch mechanism.

In the case of the illustrated example, the disc-shaped first clutch plate C1 and the second clutch plate C2 are fixed at a predetermined interval at the center of the rotation shaft 50 of the input cam 5.
In addition, a third clutch plate C3 urged in a connecting direction by a spring is provided outside the first clutch plate C1 on the rotary shaft 50 so as to be slidable in the approaching or separating direction along the rotary shaft 50. ing.
A first operating piece 135 having a two-way cam is fixed to the first clutch plate C1, and a first operation lever 110 is attached via a guide plate 112.

Similarly, the fourth clutch plate C4 urged in the connecting direction by a spring on the outer side of the second clutch plate C2 on the rotary shaft 50 is slidable in the approach or separation direction along the rotary shaft 50. Is provided.
A second operating piece 136 having a two-way cam is fixed to the second clutch plate C2, and the second operating lever 120 is attached to the second operating piece 136.

That is, the first operating lever 110 is formed with a pedal portion 111 that is substantially T-shaped and extends rearward.
Further, the front upper portion extending in the vertical direction of the pedal portion 111 is pivotally attached to the fixed position between the side walls of the cam support portion 6 by the fifth pin P5, and the lower portion is pivotally attached to the end portion of the guide plate 112 P6. Yes.

The guide plate 112 extends linearly and has a long hole 113 in the front, and a seventh pin P7 provided at the lower portion of the first tilting moving piece 135 is slidably fitted into the long hole 113. is doing.
Reference numeral 114 denotes a torsion spring as an example of a spring that urges the first operating lever 110 in a neutral position where the pedal portion 111 is substantially horizontal.

Accordingly, when the first operation lever 110 at the neutral position (A) indicated by the solid line in the figure is depressed downward, the pedal portion 111 is rotated clockwise in the figure by using the fifth pin P5 as a fulcrum, and the guide plate 112 is indicated by the dotted line. The first tilting moving piece 135 is tilted in the clockwise direction in the figure via the sixth pin.
As a result, the third clutch plate C3 and the first clutch plate C1 are connected, and the rotary shaft 50 is tilted clockwise in the drawing to rotate the input cam 5 from the neutral position (A) indicated by the solid line to the rotation / swivel lock indicated by the dotted line. It can be displaced to the position (b).

When no force is applied to the first operating lever 110, the restoring force of the spring 114 returns the first operating lever 110 from the dotted line position to the neutral position (A) shown by the original solid line (FIG. 14 (a)). )reference).
Here, the mechanical portions of the first operation lever 110 and the second operation lever 120 are housed in the housing 200 of the cam support portion 6, and the inner wall of the housing 200 serves as a stopper for the first operation lever 110. The counterclockwise rotation in the figure is restricted at the neutral position (A).

Next, as shown in FIGS. 14B and 14C, the second operation lever 120 has a front fan-shaped portion and a pedal portion 121 that extends linearly rearward.
The lower main part of the front part of the substantially fan-shaped body is pivotally attached to the housing 200 of the cam support part 6 by the eighth pin P8, and the upper part is formed with an arc-shaped long hole 123 along the fan shape. ing.
A ninth pin P9 as a cam fitted in a long hole 137 provided in the lower portion of the second tilting moving piece 136 is slidably fitted in the long hole 123.
Reference numeral 124 denotes a torsion spring as an example of a spring that urges the second operation lever 120 in a neutral position (A) where the pedal portion 121 is substantially horizontal.

Accordingly, when the second operating lever 120 at the neutral position (A) indicated by the solid line in the figure is stepped downward, the second pin is rotated clockwise with the eighth pin P8 as a fulcrum, and the second pin via the ninth pin P9. The tilting moving piece 136 is tilted counterclockwise in the drawing (see FIG. 14C).
As a result, the second clutch plate C2 and the fourth clutch plate C4 are connected and engaged, and the rotary shaft 50 is tilted counterclockwise in the drawing, so that the input cam 5 is indicated by a dotted line from the neutral position (A) indicated by a solid line. It can be displaced to the swivel lock position (c).

When no force is applied to the second operating lever 120, the restoring force of the spring 124 returns the second operating lever 120 to the original neutral position (A).
At this time, the second tilting moving piece 136 is fixed at the position as it is, the ninth pin P9 as a cam is not displaced, the elongated hole 123 is rotationally displaced, and only the second operation lever 120 is in the neutral position (i.e. ) (See FIG. 14B).

Accordingly, when the first operation lever 110 is stepped down from the neutral position (A), it is displaced to the rotation / turn lock position (B), and when the second operation lever 120 is stepped downward from the neutral position (B), the turn lock is established. Displace to position (b).
When one of the first operation lever 110 and the second operation lever 120 is stepped down and the other is stepped down, the rotating shaft 50 returns to the neutral position (A).

The operation member of still another embodiment shown in FIGS. 16 and 17 is interlocked by a first operation lever 150 provided with the rotating shaft 50 of the input cam 5 on the upper side and a second operation lever 160 provided on the lower side. It consists of an operating structure.
Also in this embodiment, the first operation lever 170 and the second operation lever 180 are arranged side by side.

The first operating lever 150 provided on the upper side rotates the first gear portion G1 fixed to the rotating shaft 50 of the input cam 5 by placing the pedal portion 151 in the midway position to the neutral position (A).
The first operation lever 150 is in the turning lock position (c) when the pedal portion 151 is in the upper position, is in the neutral position (b) when in the middle, and is in the braking / turning lock position (b) when in the lower position.

Below the first gear portion G1, an auxiliary rotation shaft 50 ′ is pivotally supported by the cam support portion 6 below the rotation shaft 50. The auxiliary rotation shaft 50 ′ meshes with the first gear portion G1. The second gear portion G2 is fixed.
The second operation lever 160 extends rearward from one end of the second gear portion G2.
The second operation lever 160 is in a braking / turning lock position (B) when the pedal portion 161 is in the upper position, is in a neutral position (A) when in the middle position, and is in a rotation lock position (C) when in the lower position. .

With the above-described configuration, when the pedal portion 151 of the first operation lever 150 is stepped down, the input cam 5 is rotated clockwise via the first gear portion G1, and the braking / turning lock position (B) is set. Become.
Further, the second gear part G2 rotates counterclockwise by the clockwise rotation of the first gear part G1, and the second operation lever 160 is displaced to the upper position.

When the pedal portion 161 of the second operation lever 160 is depressed to the bottom, the first gear portion G1 is interlocked and rotated counterclockwise through the clockwise rotation of the second gear portion G2, and the input cam 5 is counterclockwise. Rotate in the direction to the swivel lock position (c).
When the pedal 151 or 161 on the side that is on either the first operation lever 150 or the second operation lever 160 is stepped on to the original midway position, both the first and second operation levers 150 and 160 are in the midway position. Displaced to the neutral position (b).

18 to 22 show still another embodiment in which the operation member shown in the third embodiment is modified.
Also in this embodiment, the first operation lever 170 and the second operation lever 180 are arranged side by side.
The upper first operating lever 170 is fixed to the rotary shaft 50 that is pivotally supported by the cam support portion 6, and protrudes to one side end (left side as viewed from the pedal portion in the illustrated example). G10 is provided integrally.

Similarly, the lower second operating lever 180 is fixed to an auxiliary rotating shaft 50 ′ provided in parallel and spaced below the rotating shaft 50 so as to be rotatable.
And the 2nd gear part G20 which protrudes in the other side end of the 2nd operation lever 180 (The right position seeing from the pedal part on the right side in the illustration example and the said 1st gear part G10.) Is provided integrally. .

Further, the second operation lever 180 is integrally formed with a fourth gear portion G40 having a diameter larger than that of the third gear G30 at the side end opposite to the second gear portion G20.
An interlocking member 190 is fixed to the rotary shaft 50 at a position corresponding to the first operation lever 170.
The interlocking member 190 is provided with a third gear portion G30 that meshes with the fourth gear portion G40.

  Accordingly, in the second operation lever 180, the second gear portion G20 meshes with the first gear portion G10 of the first operation lever 170, and the fourth gear portion G40 meshes with the third gear portion G30 of the interlocking member 190.

  With the above-described configuration, when the pedal 171 of the first operating lever 170 is operated, the neutral position (A) is obtained when the pedal 171 is in the middle position, and the rotating shaft 50 rotates in the same direction when rotated counterclockwise in the figure. When the pedal portion 171 is moved upward, the turning lock position (c) is reached. When the pedal 171 is rotated clockwise from the neutral position (a) in the drawing, the rotating shaft 50 is interlocked and the pedal 171 is moved downward to perform braking / turning. The lock position (B) is reached (see FIG. 22A).

  Similarly, when the pedal 181 of the second operating lever 180 is operated, the neutral position (A) is reached when the pedal 181 is in the middle position, and when the pedal 181 is rotated counterclockwise in the figure, the rotary shaft 50 rotates clockwise in the figure. When the pedal portion 181 is moved upward, the brake / swivel lock position (B) is reached. When the pedal 181 is rotated clockwise from the neutral position (A) in the drawing, the rotary shaft 50 rotates in the opposite direction. When 181 goes down, the turning lock position (c) is reached (see FIG. 22 (a)).

  In other words, when the brake / turning lock is desired, the pedal 171 of the first operation lever 170 is depressed from the neutral position, and when the turn lock is desired, the pedal 181 of the second operation lever 180 is depressed from the neutral position, When the neutral position is desired, an operation of depressing a pedal that is raised upward to a neutral position (or raising a pedal that is lowered downward to a neutral position) may be performed.

In the present invention, the shape of the input cam is not limited to the embodiment, and it is only necessary that the input cam can be displaced in three stages: a neutral position, a turning lock position, and a braking / turning lock position.
Further, the operation member is not limited to the above embodiment as long as the input cam member can be rotationally displaced in the three stages.
In addition, it goes without saying that various design changes can be made without departing from the scope of the present invention.

It is a fragmentary sectional view which shows the locking device of the caster of Example 1. It is a side view of the caster of FIG. It is a longitudinal cross-sectional view of the back side of the caster. It is a front view of the caster. It is a top view of the caster. It is an expanded sectional view of the turning mechanism part of a caster. It is an enlarged view of the cam member for input. It is principal part sectional drawing which shows a neutral state. It is principal part sectional drawing which shows a braking and turning lock state. It is principal part sectional drawing which shows a rotation lock state. It is a top view which shows an example of the operation member which operates a rotating shaft. It is a side view explaining operation | movement of an operation member. FIG. 6 is a plan view showing an operation member of Example 2. (A) is a side view for explaining the operation of the first operation lever, (b) a side view for explaining the relation between the first operation lever and the second operation lever, and (c) is a side view for explaining the operation of the second operation lever. FIG. It is the same perspective view. FIG. 10 is a plan view illustrating an operation member according to a third embodiment. (A) is a side view explaining operation | movement of a 1st operation lever, (b) is a side view explaining operation | movement of a 2nd operation lever. FIG. 10 is a plan view illustrating an operation member according to a fourth embodiment. It is a longitudinal cross-sectional view which shows the principal part of an operation member. (A) is a right side view of the first operating lever, and (b) is a left side view thereof. (A) is a right side view of the second operating lever, and (b) is a left side view thereof. (A) is a side view for explaining the operation of the first operation lever, (b) is a side view for explaining the relationship between the second operation lever and the first operation lever, and (c) is a relationship between the second operation lever and the interlocking member. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Caster 2 Fixed base plate 3 Support yoke 4 Wheel 5 Input cam member 6 Cam support part 7 Operation member 8 1st lever piece 9 Transmission shaft 10 Mounting base 11 Through-hole 13 Top plate part 14 Bearing case part 16 Coil spring 20 1st 2 lever piece 21 latching piece 23 end 22 bracket 20 second lever piece 31 first turning lock receiving part 32 second turning lock receiving part 40 braking lock member 41 brake shoe 42 recess 50 rotating shafts 51 to 54 first to first 4 cam surfaces 55, 56 first and second projecting surfaces 60 spring material 61 upper piece 62 lower piece 63 engaging projections P1 to P8 first pin to eighth pin 100 operation lever 110 first operation lever 120 second Operation lever 150 First operation lever 160 Second operation lever 170 First operation lever 180 Second operation lever 190 Interlocking member

Claims (7)

A fixed base plate that pivotally supports a support yoke that pivots a wheel and is fixed to a mounted body;
A cam support provided below the fixed base plate and supporting the rotation shaft of the input cam member;
A neutral cam surface provided on the input cam member, a braking / turning lock cam surface provided continuously on one side with the cam surface as a center, and a turn lock cam surface provided on the other side When,
An operation member connected to the rotation shaft of the input cam member and extending outward;
A first lever piece pivotally attached to the cam support portion, wherein the input cam member moves up and down by moving the input cam member to the cam surface for braking and turning lock;
A transmission shaft that is fixed to a fixed base plate and is inserted into a mounting base of a substantially cylindrical body that is inserted into a support yoke so as to be movable up and down, and is repulsively pushed down by lowering the tip of the first lever piece;
A brake lock that is pivotally attached to the support yoke below the transmission shaft, and has one end pivotally displaced downward by the lowering of the transmission shaft and presses a brake shoe provided at the bottom against the tread surface of the wheel to brake the wheel. A member,
A turning lock piece having a piece provided with an engagement protrusion for urging the braking lock member in the braking release direction and pushed up by the pivot of the braking lock member;
A first turning lock receiving portion provided on a first receiving member fixed to the fixed base plate and engaging the engaging protrusion of the turning lock piece to restrain the turning of the support yoke;
A second lever piece whose tip moves up and down as the input cam member is displaced to the turning lock cam surface;
A caster comprising: a second turning lock receiving portion which is provided on a second receiving member fixed to the support yoke and engages a tip of the second lever piece. The second receiving member is composed of a saucer portion fixed to the lower end of the mounting base portion, the upper portion of which is fixed to the fixed base plate and fitted into the support yoke, and the first swiveling lock receiving portion including a recess opening downward is provided. Formed,
The first receiving part member is composed of an upper plate part fixed together with a support yoke to a bearing case part that rotates integrally with the outer ring of the bearing part that is externally fitted to the mounting base part, and includes a concave part that opens upward. The caster according to claim 1, wherein a two-turn lock receiving portion is formed.   The cam member for input forms a cam surface for braking / turning lock on one side of the rotation direction adjacent to the cam surface for neutral, and the cam surface for rotation lock on the other side of the rotation direction adjacent to the neutral cam surface The caster according to claim 1, wherein the caster is formed.   2. The caster according to claim 1, wherein the operation member comprises a single operation lever that is fixed to the rotation shaft of the input cam member and can rotate the rotation shaft. The operating member is provided on substantially the same plane side by side on the left and right, and is connected to the rotating shaft of the input cam member via the first clutch mechanism, and a second operating lever is connected to the rotating shaft. It consists of a second operating lever that is connected intermittently via a clutch mechanism,
By operating the first control lever, the rotational shaft of the input cam member is rotationally displaced from the neutral position to the braking / swivel lock position,
2. The caster according to claim 1, wherein the rotation shaft of the input cam member is reversely displaced from the neutral position to the turning lock position by operation of the second operation lever. The operation members are provided in a pair of upper and lower sides side by side, and are formed integrally with a first gear that is integrally attached to the rotation shaft of the input cam member, and can rotate the rotation shaft. An operating lever;
The rotating shaft is formed integrally with a second gear that is attached to an auxiliary rotating shaft that is spaced apart below the rotating shaft and meshes with the first gear at the upper or lower position via the first gear. The caster according to claim 1, further comprising a second operation lever capable of rotating. A first operating lever and an interlocking member are provided side by side on the rotating shaft, and a second operating lever is provided on the auxiliary rotating shaft,
The second operation lever includes a second gear portion that meshes with a first gear portion formed on the first operation lever, and a fourth gear portion that meshes with a third gear portion formed on the interlocking member. The caster according to claim 5, wherein the caster is provided.

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