JP2006242268A - Brake device for manual transfer roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an undercarriage loaded with an object to be transferred from falling down a slope and enable the undercarriage to come to a stop even when a pulling power or a pressuring force by an operating handle is released at a midpoint, say, in a hill. <P>SOLUTION: A brake device for a manual transfer roller is provided with a ratchet gear 31, a sector-shaped cam member 33, and a pair of right and left ratchets 32. The rachet gear 31 has a tooth profile fitting insertion hole part 31A in its center so that the fitting insertion hole part 31A is insertion-engaged with a drive shaft 8 on the shaft end side having a roller for traveling. Then the ratchet gear 31 is provided with a ratchet tooth part 31B on its outer periphery. Then the cam member 33 is provided above the ratchet gear 31 so that the cam member 33 can freely oscillate in the right-and-left rotating directions through the medium of a switching operation lever. The pair of right and left ratchets 32 is symmetrically arranged in the right-and-left positions of the cam member 33 in a state that the pair of right and left ratchets 32 is oscillation-energized so that the cam member 33 is sandwitched from both sides. Then either one of the pair of right and left ratchets 32 is engaged with an engagement position with the ratchet tooth part 31B or released for oscillation by moving in contact from the arc part 33A of the sector of the cam member 33 to the triangle part 33B side by the rotation of the cam member 33 through the medium of the switching operation lever. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is used for, for example, a heavy-duty loading / unloading and installation in various factories, construction sites, etc., and is a manual conveyance roller for performing conveyance manually or manually without requiring traction power. Even so, the present invention relates to a brake device for a manual transport roller that can transport a transported object without difficulty by rotating in only one direction without being moved backward and downward.

Conventionally, for transporting various heavy objects, for example, a truck with traveling rollers attached to the four corners of the lower surface of the pedestal is used, and various heavy objects are placed on the pedestal and moved together with the trolley. It is said. A turntable is rotatably supported on the base, and the direction and direction of the conveyed product can be changed on the assumption that the object to be conveyed is placed on the turntable. Further, an operation handle is attached to either side of the front and rear side wall surfaces of the carriage, and the carriage is moved by pushing or pulling a grip portion at the other end of the operation handle by hand.
nothing special

  However, in the conventional cart, when moving an inclined surface such as a slope with a cart with a heavy object placed thereon, the cart itself is not provided with a brake device. The trolley must be moved at a stretch while always maintaining the traction force or pressing force of the vehicle and preventing reverse movement during transportation. In addition, in order to provide the carriage with a brake device that allows traveling in only one direction and does not reverse, an extra installation space is required inside, and the structure itself becomes complicated. Moreover, the actual situation is that a brake device having a simple configuration for eliminating such conventional drawbacks does not yet exist.

  Therefore, the present invention was created in view of the conventional circumstances as described above, and by forming a pack type external ratchet type brake device that can be easily attached to and detached from an existing carriage. When moving an inclined surface such as a hill with a carriage with a heavy object placed on it, even if the traction force or pressing force through the manual operation handle is not always maintained, it is possible to keep it at a reasonable pitch interval. Provided is a brake device for a manual transport roller that can move a carriage and can stop the carriage without falling down an inclined surface even if the tractive force or pressing force through an operation handle is canceled halfway. For the purpose.

In order to solve the above-described problem, in the present invention, a brake is applied to the traveling roller 2 supported on the frame 1 that is movable via the operation handle 10 in a state where various objects to be conveyed P are placed. A brake device 20 for a manual conveyance roller that is detachably attached to the side wall surface of the frame 1 so as to exert an action, and the brake device 20 is disposed on an end portion side of the shaft 4 to which the traveling roller 2 is fitted. A ratchet gear 31 having a toothed insertion hole 31A in the center and a ratchet tooth 31B on the outer periphery so as to be inserted and held, and swingable in the left-right rotation direction via the switching operation lever 35. The fan-shaped cam member 33 disposed on the upper side of the ratchet gear 31 and the cam member 33 are arranged symmetrically at the left and right positions of the cam member 33 in a state of being oscillated and urged so as to sandwich the cam member 33 from both sides. By rotation of the cam member 33 in either the left or right direction via the replacement operation lever 35, one of the cam members 33 comes into contact with the triangular portion 33B from the circular arc portion 33A of the fan, and the ratchet tooth portion 31B contacts the ratchet tooth portion 31B. The brake device 20 includes a pair of left and right ratchets 32 that are locked or unlocked at the meshing position.
At this time, at the rotation neutral position of the switching operation lever 35, the pair of left and right ratchets 32 abut on the arc portion 33A of the fan of the cam member 33, so that the ratchet teeth 31B of the ratchet gear 31 and the ratchet 32 are engaged. It can be configured to be released simultaneously on the left and right. Further, the brake device 20 can be arranged inside a pack-like brake housing 22 that can be fixed with screws to the side wall surface of the frame 1.
Furthermore, the switching operation lever 35 can include a click rotation mechanism unit 38 on the outer surface of the brake housing 22 so as to lock the switching operation lever 35 at either the left or right rotational position.
In addition, the ratchet tooth portion 31B of the ratchet gear 31 is inserted and held on the hexagonal drive shaft 8 that is extended toward the end of the shaft 4 and can be finely adjusted forward or backward. Can do.

In the brake device 20 for a manual transport roller according to the present invention configured as described above, when the inclined surface Q is moved manually or manually, for example, with the object P being placed, a switching operation is performed. By rotating the cam member 33 in either the left or right direction via the lever 35, either one of the ratchets 32 is brought into contact with the triangular portion 33B side from the arc portion 33A of the fan of the cam member 33 to thereby move the ratchet gear 31. By locking and swinging at the meshing position with the ratchet tooth portion 31B, rotation in one direction of the ratchet gear 31 is prevented, and the traveling roller 2 fitted to the shaft 4 is restricted to rotation in only one direction, Prevent reverse rotation.
As a result, even if the tractive force or the pressing force through the operation handle 10 is canceled in the middle, the manual conveying roller itself does not rotate reversely and the inclined surface Q does not fall or fall.
On the other hand, when moving the horizontal plane with the transported object P placed, when the switching operation lever 35 is set to the rotation neutral position, the pair of left and right ratchets 32 are brought into contact with the arc portion 33A of the fan of the cam member 33. The ratchet teeth 31B of the ratchet gear 31 and the ratchet 32 are disengaged simultaneously on the left and right sides, so that the ratchet gear 31 is in a free rotating state and the traveling roller 2 fitted on the shaft 4 can freely rotate in the left and right direction. Let me.
The brake housing 22 allows the brake device 20 itself to be attached to the side wall surface of the frame 1 and allows the brake device 20 to be removed and removed.
The click rotation mechanism unit 38 enables the rotation positioning of the cam member 33 by locking the switching operation lever 35 at either the left or right rotation position.
The ratchet gear 31 fitted and held on the hexagonal drive shaft 8 that can be finely adjusted forward or backward is used for fine adjustment of the positioning of the frame 1 around the drive shaft 8 on the inclined surface Q. Rotation in one direction, for example, the downward direction of the inclined surface Q is prevented.

  According to the present invention, a pack-type externally attached ratchet brake device 20 built in the brake housing 22 is formed so as to be screwed and fixed to a cart that can be easily attached to and detached from an existing cart. Thus, when moving the inclined surface Q such as a slope with the carriage while the object to be transported P is placed, it is not necessary to keep the traction force or the pressing force through the operation handle 10 constantly. The carriage can be moved at a proper pitch interval, and even if the tractive force or pressing force through the operation handle 10 is canceled halfway, the carriage can be stopped without falling on the inclined surface Q, and the positioning is delicate. Also make it possible.

  That is, this is because the brake device 20 according to the present invention has a tooth-shaped fitting insertion hole 31A at the center and a ratchet on the outer periphery so that the running roller 2 is fitted and held on the end side of the shaft 4. A ratchet gear 31 having a tooth portion 31B, a fan-shaped cam member 33 arranged on the upper side of the ratchet gear 31 so as to be swingable in the left-right rotation direction via a switching operation lever 35, and the cam member 33 from both sides. The cam member 33 is symmetrically disposed at the left and right positions of the cam member 33 in a state of being oscillated and biased so as to be sandwiched, and either of the cam members 33 is rotated by the cam member 33 via the switching operation lever 35 in either the left or right direction. A pair of left and right ratchets that are brought into contact with and shifted from the circular arc portion 33A of the fan 33 toward the triangular portion 33B to be locked or released at the meshing position with the ratchet tooth portion 31B. Therefore, even if the tractive force or the pressing force via the operation handle 10 on the inclined surface Q is canceled halfway, the manual conveyance roller itself is held without falling. Therefore, the carriage can be moved on the inclined surface Q at a small pitch interval without difficulty.

  At this time, at the rotation neutral position of the switching operation lever 35, the pair of left and right ratchets 32 come into contact with the arc portion 33A of the fan of the cam member 33, so that the ratchet teeth 31B of the ratchet gear 31 and the ratchet 32 are engaged. Since the left and right are released at the same time, the traveling roller 2 itself is in a free-rotating state, and can be easily moved manually in the front-rear direction manually or the like when moving the horizontal plane.

  Further, the brake device 20 is arranged inside the pack-like brake housing 22 that can be fixed with screws to the side wall surface of the frame 1, so that the brake device 20 itself can be attached to or removed from the side wall surface of the frame 1. Can be done easily.

  Further, the switching operation lever 35 includes a click rotation mechanism portion 38 for locking the switching operation lever 35 at either the left or right rotation position on the outer surface of the brake housing 22. Therefore, the cam member 33 is idled together with the switching operation lever 35 during traveling on the inclined surface Q, so that the ratchet teeth 31B of the ratchet gear 31 and the ratchet 32 are disengaged. Can be prevented.

  In addition, the ratchet tooth portion 31B of the ratchet gear 31 is inserted and bite into the hexagonal drive shaft 8 that is extended toward the end of the shaft 4 and can be finely adjusted forward or backward. Further, fine adjustment of the forward or backward movement by the drive shaft 8 on the inclined surface Q can be easily performed, and fine positioning is also possible.

  Note that the reference numerals added in the means for solving the above-described problems and the effects of the invention are given for easy reference to the parts showing the components shown in the drawings. The present invention is not limited to the structure / shape indicated by the reference numeral.

  The best mode for carrying out the present invention will be described below with reference to the drawings. Reference numeral 1 shown in the figure is a frame constituting a manual conveying roller according to the present invention. As shown in FIG. 1 and FIG. 3, the flat surface has a substantially rectangular shape, for example, and the opening is directed downward, and the running rollers 2 formed of, for example, urethane resin are supported on the four corner sides. is there. The frame 1 itself is formed of a solid material such as a lightweight and strong aluminum alloy that can withstand and load the object to be conveyed P, and the surface is coated with an environment-friendly powder coating.

  Also, on the lower surface side of the frame 1, roller support chambers 3 are provided at four corners by being partitioned by partition plates 6 orthogonal to each other. The shaft 4 is rotatable through bearings 5 fitted to the central partition plate 6 for forming the roller support chambers 3 on the left and right sides and the left and right side wall surfaces of the frame 1 facing the partition plate 6. It is supported. The running roller 2 made of, for example, urethane resin or the like is fitted into each of the shafts 4 so as to be fitted along the key groove 4A that is slightly elongated at the left / right symmetrical position of the shaft 4, thereby The traveling rollers 2 are arranged in the roller bearing chambers 3 at the four corners.

  On the other hand, the turntable 7 is rotatably supported on the top plate portion at the top of the frame 1 by a rotating shaft supported via a pivot bearing formed on the top plate portion, an oil washer disposed on the top plate surface, a ball bearing, and the like. It is. The transported object P placed on the turntable 7 is supported by the side of the frame 1, and the turntable 7 itself is connected to the frame 1 in any direction with respect to the transported object P. Relative alignment of each other is possible.

  Further, hexagonal drive shafts 8 are integrally formed at both ends of both shafts 4, and when carrying the delicate conveyance positioning with the conveyed object P placed on the manual conveyance roller, By rotating the drive shaft 8, the manual conveyance roller itself can be finely adjusted forward or backward.

  Further, rib portions 9 project from left and right symmetrical positions on the front and rear side wall surfaces of the frame 1, and each of the mounting hole portions 9 </ b> A formed so as to face each other in the left and right rib portions 9 has a long operation. A U-shaped one end portion of the mounting distal end portion 11 bent in a lateral U-shape at the distal end of the handle 10 can be inserted from either the forward or reverse direction. As a result, the operation handle 10 is attached to either one of the front and rear side wall surfaces of the frame 1, and the manual conveying roller is moved by pushing or pulling the grip portion 10A at the other end of the operation handle 10 by hand. It is as.

  Further, as shown in FIG. 3 and FIG. 4, support pin members 12 project from the left and right rib portions 9 so as to be parallel to the attachment hole portion 9 </ b> A to which the operation handle 10 is attached. In addition, by supporting the U-shaped curved portion formed at the mounting tip 11 of the operation handle 10 from below with the support pin member 12, the operation handle 10 itself is in an elevation posture even if the grip portion 10A is released from the hand. Can be maintained at any time.

  The brake device 20 according to the present invention is attached to the side wall surface of the frame 1 from which the hexagonal drive shaft 8 is formed which is formed at the end of the shaft 4 of the traveling roller 2 so as to be detachable. . When the manual conveying roller is moved on the inclined surface Q via the operation handle 10 with various objects to be conveyed P placed thereon, the braking device 20 brakes the traveling roller 2 supported on the frame 1. The action is exerted so that the manual conveying roller itself does not fall on the inclined surface Q. The installation position of the brake device 20 may be any of the front and rear shafts 4 and may be on the side opposite to the drive shaft 8.

  The brake device 20 is formed in a pack shape having a spacer portion 21 and a brake housing 22 that are fixedly fitted and fixed to each other by screw fastening so that a ratchet gear 31, a ratchet 32, a cam member 33, a spring 34, and the like are housed. ing. That is, the spacer portion 21 has drive shaft insertion holes 23 that are inserted into the drive shaft 8 at the end of the shaft 4 and project a part of the tip end portion outward, and are provided at the four corners of the spacer portion 21. A screw insertion hole 25 is formed corresponding to the four screw holes 24 formed on the side wall surface of the frame 1.

  The brake housing 22 has a vertically long rectangular recess 27 formed on one side surface of the spacer portion 21, and the brake housing 22 has a recess 27 so as to face the drive shaft insertion hole 23 of the spacer portion 21. A cylindrical shaft portion of the ratchet gear 31 is rotatably fitted in a shaft hole 28 formed on the lower side. The shaft portion of the ratchet gear 31 has a tooth-shaped, for example, twelve-sided insertion hole portion 31A at the center so as to be fitted and held on the drive shaft 8 on the end portion side of the shaft 4, and a triangular protrusion on the outer periphery. A ratchet tooth portion 31B is provided.

  Further, a slightly smaller shaft hole 29 formed on the upper side in the recess 27 projects into the flat side surface side of the cam member 33 having a substantially fan shape with the upper arc portion 33A and the lower triangular portion 33B. The projecting portion 33C is inserted, and the tip of the projecting portion 33C projecting to the outside of the brake housing 22 is fitted into the central hole of the substantially flat trapezoidal switching operation lever 35, and then secured by the spring pin 36. It is. Thus, by rotating the switching operation lever 35 clockwise or counterclockwise, the cam member 33 disposed on the upper side of the ratchet gear 31 itself can swing in the left-right rotation direction. A slight gap is formed between the cam member 33 and the spacer portion 21, and a separator 37 is interposed here.

  As shown in FIG. 5, the brake housing 22 has a substantially hemispherical shape at each of the 180 ° left-right position, 135 ° left-right position, and 45 ° left-right position around the rotation center of the switching operation lever 35 integrated with the cam member 33. On the outer surface of the brake housing 22 by allowing the spherical body of the short plunger 38B attached to the left and right back surfaces of the switching operation lever 35 to be engaged with any one of these recesses 38A. , A click rotation mechanism portion 38 for locking the switching operation lever 35 at either the left or right rotational position is formed.

  In addition, the rear end portions of the pair of left and right ratchets 32 are pivotally attached to the upper edge of the recess 27, and the pair of left and right ratchets 32 swings and biases the cam member 33 from both sides. A spring 34 is interposed between the tip end side of the ratchet 32 and the left and right edge ends in the recess 27 so as to cause the spring 34 to move.

  In this way, the ratchet 32 is provided at each of the left and right symmetrical positions of the cam member 33 in a state where the cam member 33 is rocked and biased so as to sandwich the cam member 33 from both sides. By doing so, one of the ratchets 32 is changed from the arc portion 33A of the fan of the cam member 33 to the linear portion on the triangular portion 33B side by rotating the cam member 33 in either the left or right direction via the switching operation lever 35. The contact ratchet 32 is rotated to the meshing position with the ratchet tooth portion 31B, and the other ratchet 32 remains in contact with the arc portion 33A of the fan of the cam member 33 and the meshing with the ratchet tooth portion 31B is released. It can be maintained.

  On the other hand, at the rotation neutral position of the switching operation lever 35, the pair of left and right ratchets 32 are simultaneously in contact with the arc portion 33 </ b> A of the fan of the cam member 33. They are released at the same time.

  Next, in order to explain an example of assembly, use, and operation of the embodiment configured as described above, a ratchet gear 31, ratchet 32, cam member 33, spring in the recess 27 of the brake housing 22 in advance. In a state where 34 or the like is incorporated, each of the spacer portion 21 and the brake housing 22 is matched and fixed by screw fastening. When the brake device 20 is attached to the side wall surface of the frame 1, the ratchet gear 31 is inserted into the hexagonal drive shaft 8 at the end of the shaft 4 from the drive shaft insertion hole 23 side of the spacer portion 21 as shown in FIG. The drive shaft 8 is inserted and held in the insertion hole 31A of the tooth type. In this state, the screw insertion holes 25 at the four corners of the spacer portion 21 are aligned with the screw holes 24 at the four corners of the side wall surface of the frame 1, and the screws 26 are inserted into the screw insertion holes 25 and screwed into the screw holes 24 of the frame 1. Then, the brake device 20 is attached to the side wall surface of the frame 1 by firmly fixing the spacer portion 21 to the frame 1. In addition, what is necessary is just to remove the screw | thread 26 and remove the spacer part 21 from the frame 1 side wall surface, when removing the brake device 20. FIG.

  When the manual transfer roller is moved on the horizontal plane with the transfer object P placed on the turntable 7, as shown in FIGS. 5 and 7, the switching operation lever 35 should be set to the rotation neutral position. For example, when a pair of left and right ratchets 32 abut on the arc portion 33A of the fan of the cam member 33 at the same time, the meshing between the ratchet teeth 31B of the ratchet gear 31 and the ratchet 32 is released at the same time on the left and right. You can move backwards freely.

  As shown in FIGS. 8 and 9, when the manual transport roller is moved on the inclined surface Q ascending to the right with the transported object P placed thereon, the switching operation lever 35 is clicked and rotated. When it is rotated 45 degrees counterclockwise by 38, the cam member 33 is also rotated together. Then, the right ratchet 32 is brought into contact with the triangular portion 33B from the circular arc portion 33A of the fan of the cam member 33 by the urging force of the spring 34, and the right ratchet 32 meshes with the ratchet tooth portion 31B of the ratchet gear 31. . At this time, the ratchet 32 on the left side remains in contact with the arc portion 33A of the fan of the cam member 33 and maintains a state where the meshing with the ratchet tooth portion 31B is released.

  As a result, the ratchet 32 prevents the ratchet gear 31 from rotating counterclockwise, and the tractive force or the pressing force via the operation handle 10 is released halfway, or the operation handle 10 is released from the hand. Even so, the manual conveyance roller 2 itself does not fall leftward along the inclined surface Q, for example.

  Moreover, even if the traction force or the pressing force through the operation handle 10 is not always maintained, the manual conveying roller can be moved upwardly on the inclined surface Q at a reasonable small pitch interval. Further, when the positioning of the frame 1 is finely adjusted by turning the drive shaft 8 on the inclined surface Q, the ratchet gear 31 is prevented from rotating counterclockwise, that is, rotating downward on the inclined surface Q. Become.

  As shown in FIGS. 10 and 11, when the manual conveyance roller is moved on the inclined surface Q that rises to the left with the object P placed thereon, the switching operation lever 35 is clicked by the click rotation mechanism unit 38. When it rotates 45 degrees clockwise, the cam member 33 also rotates together. The left ratchet 32 is brought into contact with the triangular portion 33B from the circular arc portion 33A of the fan of the cam member 33 by the urging force of the spring 34, and the left ratchet 32 meshes with the ratchet tooth portion 31B of the ratchet gear 31. . At this time, the right ratchet 32 remains in contact with the arcuate portion 33A of the fan of the cam member 33 and maintains a state in which the meshing with the ratchet tooth portion 31B is released.

  As a result, the ratchet 32 prevents the ratchet gear 31 from rotating clockwise, and the tractive force or pressing force via the operation handle 10 is released halfway, or the operation handle 10 is released from the hand. However, the manual conveyance roller itself does not fall rightward along the inclined surface Q.

  In this way, the manual conveying roller can be moved upwardly on the inclined surface Q at a reasonable small pitch interval without always maintaining the traction force or the pressing force through the operation handle 10. Become. On the inclined surface Q, when the fine adjustment of the positioning of the frame 1 is performed by turning the drive shaft 8, the ratchet gear 31 is prevented from rotating clockwise, that is, rotating downward on the inclined surface Q. It becomes.

  Although not shown in the drawings, when the transported object P is placed and transported, when a plurality of transport rollers are arranged on the bottom surface of the transported object P, the transport rollers positioned on the left and right in the transport direction are In some cases, the driving rod 8 is connected to a synchronous rod that is operated in a synchronized manner, and even in this case, the stop control can be similarly performed by attaching the brake device according to the present invention to any one of the conveying rollers.

It is a perspective view of the use condition which shows the best form for implementing this invention. It is a perspective view which shows the state which similarly attaches a brake device to a manual conveyance roller. FIG. 6 is a partially cutaway plan view of the manual transport roller with the brake device attached thereto. FIG. 6 is a partially cutaway side view of the manual transport roller in use. FIG. 6 is a side view including a partly enlarged plan view in a state where the drive shaft of the manual transport roller is also mounted. It is a sectional view of a brake device in the state where it was similarly attached to the drive shaft of a manual conveyance roller. It is a sectional side view inside a brake housing | casing in a brake release state similarly. It is a side view which shows the brake device of the state which rotated the switching operation lever counterclockwise similarly on the inclined surface where it goes up to the right. FIG. 5 is a side cross-sectional view showing the inside of the brake housing in a state where the rotation of the traveling roller is prevented in the counterclockwise direction on the inclined surface that also rises to the right. It is a side view which shows the brake device of the state which rotated the switching operation lever clockwise similarly on the inclined surface which went up to the left. FIG. 6 is a side cross-sectional view showing the inside of the brake housing in a state in which the rotation of the traveling roller is prevented in the clockwise direction on the inclined surface that is also leftward.

Explanation of symbols

P ... Conveyed object Q ... Inclined surface 1 ... Frame 2 ... Traveling roller 3 ... Roller bearing chamber 4 ... Shaft 4A ... Key groove 5 ... Bearing 6 ... Partition plate 7 ... Turntable 8 ... Drive shaft 9 ... Rib 9A ... Mounting hole 10 ... Operation handle 10A ... Grip part 11 ... Mounting tip 12 ... Support pin member 20 ... Brake device 21 ... Spacer part 22 ... Brake housing 23 ... Drive shaft insertion hole 24 ... Screw hole 25 ... Screw insertion hole 26 ... Screw 27 ... Recess 28 ... Shaft hole 29 ... Shaft hole 31 ... Ratchet gear 31A ... Insertion hole portion 31B ... Ratchet tooth portion 32 ... Ratchet 33 ... Cam member 33A ... Arc portion 33B ... Triangle portion 33C ... Projection portion 34 ... Spring 35 ... Switching control lever 36 ... Spring pin 37 ... Separator 38 ... Click rotation mechanism 38A ... Dimple 38B ... Short plunger

Claims (5)

  For manual transport rollers that are detachably attached to the side wall of the frame so that the braking action is applied to the running roller supported by the frame that can be moved via the operation handle with various heavy objects placed The brake device has a tooth-shaped fitting insertion hole at the center and a ratchet tooth on the outer periphery so as to be fitted and held on the end side of the shaft fitted with the traveling roller. The ratchet gear provided, a fan-shaped cam member disposed on the upper side of the ratchet gear so as to be swingable in the left-right rotation direction via a switching operation lever, and swingingly biased so as to sandwich the cam member from both sides The cam member is symmetrically arranged at the left and right positions of the cam member, and one of the cam members is rotated from the arc of the fan of the cam member by rotating the cam member in either the left or right direction via the switching operation lever. A brake device for a manual conveying roller, characterized by comprising a pair of left and right ratchets that are brought into contact with and moved to the shape portion side to be locked or released at a meshing position with a ratchet tooth portion. .   The pair of left and right ratchets are brought into contact with the arc portion of the fan of the cam member at the rotation neutral position of the switching operation lever so that the meshing between the ratchet teeth of the ratchet gear and the ratchet is released at the same time. The brake device for manual conveyance rollers according to 1.   The brake device for a manual transport roller according to claim 1 or 2, wherein the brake device is arranged inside a pack-like brake housing which can be fixed with screws to the side wall surface of the frame.   The brake device for a manual transport roller according to claim 3, wherein the switching operation lever includes a click rotation mechanism unit to lock the switching operation lever at either the left or right rotational position on the outer surface of the brake housing. The ratchet tooth portion of the ratchet gear is fitted and held on a hexagonal drive shaft extending toward the end portion of the shaft and capable of fine adjustment in forward or reverse. The brake device for manual conveyance rollers as described.

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