JP4767749B2 - Brake device for transport vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brake device for a carrier having a simple structure which is capable of reliably applying a brake by a relatively small operational force, and adjusting the braking force. <P>SOLUTION: A pair of brake shoes 12 for applying the brake by pressing upper portions of wheels of a pair of fixed casters are mounted on both sides of a brake shoe supporting bar 13 in a downward height-adjusting manner. A straight brake arm 15 with a brake pedal mounted on a terminating end thereof is oscilatably and pivotally supported by a pivotally supporting part with its fore end being provided on a bottom of a truck frame. The brake shoe supporting bar 13 is arranged orthogonal to the brake arm 15, and connected to a middle part of the brake arm 15 via a link coupling part 14. The brake shoe 12 is formed in a rectangular box shape with a lower end thereof being opened. An adjustment screw 12a is protruded from an upper part thereof. The adjustment screw 12a is screwed to a screw hole 13a formed in the brake supporting bar 13. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention is used in a store such as a mass retailer, a supermarket, and the like. A brake for a transport vehicle suitable as a brake for a carry cart that can be used to display and transport a product as it is in a store. Relates to the device.

  Conventionally, as a manual transport vehicle used in large stores such as supermarkets and mass retailers, it has a structure in which ladder-like vertical frames are erected on both sides of a plate-like carriage provided with four or six casters. Carry cart is known. This type of carry cart, for example, stacks box-shaped products on a cart or places long products in a line and places them on the cart, transports them as they are in the store, and uses them to display products. Is done. Since a carry cart, that is, a transport vehicle is used to display such products, the transport vehicle requires a reliable brake device.

  As a conventional brake device for this type of transport vehicle, a brake device having a structure in which a caster tire attached to a bottom portion of a carriage is directly pressed by a brake shoe to apply a brake is used. A caster brake device generally has a structure in which a press lever is provided at a wheel-supporting hawk part of each caster, and a brake shoe is pressed against a tire by the press lever to apply a brake.

  For this reason, it is necessary to perform the brake operation for each caster, and the caster located at the center bottom of the carriage is difficult to operate because the operation lever is located inside the bottom even if a brake device is attached. was there.

  Therefore, conventionally, in a transport vehicle provided with two pairs of free casters at the front and rear and a pair of fixed casters at the center bottom, the brake shoe is pressed against the pair of fixed casters at the center of the bottom by operating the brake pedal. A brake device for applying a brake is proposed in Patent Document 1 below.

However, since this brake device transmits the operating force of the brake pedal to the brake shoe via the brake wire or the link member, the mechanism is complicated, and the brake operating force of the pedal is accurately controlled by the extension of the wire and the looseness of the link. There was a possibility that it could not be transmitted. In view of this, the present inventor has proposed a brake device that improves the above-described points and transmits the brake force of the brake pedal to the brake shoe in the following Patent Document 2.
JP-A-9-175401 JP 2005-313684 A

  However, although this brake device uses a linear brake arm as a lever bar and can amplify the brake operation force by lever action to apply a strong brake, it is difficult to adjust the brake force. When the straight line portion is bent or deformed or the bending angle of the bent portion is changed to reduce the braking force, there is a problem that it is difficult to adjust the braking force.

  The present invention has been considered in view of the above points, and has a simple structure, and can brake strongly with a relatively light operating force and can adjust the braking force. The purpose is to provide.

To this end, the brake device for a transport vehicle according to the present invention is a brake device for a transport vehicle in which a pair of fixed casters is provided at the substantially center of the bottom of the carriage frame, and the fixed casters are braked by operation of a brake pedal. A pair of brake shoes that press the upper part of the wheels of a pair of fixed casters and apply the brakes are attached to both sides of the brake shoe support bar so that the height can be adjusted downward, and the straight line with the brake pedal attached to the end A brake arm is pivotally supported at a pivotal support portion provided at the bottom of the carriage frame, and a brake shoe support rod is disposed perpendicular to the brake arm and is connected to the brake arm via a link coupling portion. In the brake device that is connected to the intermediate portion of the brake arm and is formed by a straight portion between the pivot support portion of the brake arm and the link coupling portion, Rekishu are both formed in a rectangular box shape having an open lower end, is formed by projecting the adjustment screw at the top, the screw holes are provided on both side ends of the brake shoe support bar, adjusting screw into the screw hole A fixing nut is attached to the brake shoe support bar by screwing it to the height of the brake shoe support bar. The guide hole is formed in the vertical direction on both sides of the intermediate part between the link coupling part and the brake shoe, and the guide rods mounted in the vertical direction in the horizontal frame of the carriage frame are inserted into the guide holes on both sides, respectively. characterized in that was.

  In the brake device for a transport vehicle having the above-described configuration, the brake operation is performed by depressing the brake pedal at the end of the brake arm. At this time, the brake arm rotates downward via the pivotal support at the tip, and the brake arm The brake shoe coupled to the intermediate portion near the tip of the vehicle via the link coupling portion presses the upper portion of the wheel of the fixed caster downward to apply the brake.

  At this time, the force that depresses the brake pedal is transmitted directly to the brake shoe via the brake arm and the link connecting portion between the brake arm, and the lever of the brake pedal is used as a lever by using the linear brake arm as a lever bar. The depressing force is amplified and transmitted directly to the brake shoe, allowing strong braking. For this reason, even when the brake pedal is depressed relatively lightly, the brake can be applied with a sufficient braking force.

  In addition, the brake arm is disposed by forming a straight line portion without a bent portion from a pivotal support portion at a tip thereof to a brake pedal portion bent in a crank shape through a link coupling portion. Because the brake arm is used as a lever bar and the brake operation force is amplified by the lever action and the brake shoe is pressed against the wheel to apply the brake, the brake can be applied strongly, and the straight part of the brake arm is deformed Therefore, a stable braking force can be generated for a long time.

  In addition, when braking, the brake shoe, which has a rectangular box shape with an opening at the lower end, presses the wheel of the fixed caster against the floor from above, so the wheel is sandwiched between the brake shoe and the floor surface. A braking force is applied so as to be applied, whereby a large braking force can be applied and the wheels can be reliably locked.

  In addition, the vertical position of the brake shoe can be adjusted by adjusting the screw amount of the adjustment screw provided on the upper part of the brake shoe. Therefore, when the brake force is reduced due to bending deformation of the brake arm, etc. The brake force can be adjusted by adjusting the vertical position of the shoe.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings of FIGS. FIG. 1 shows a perspective view of a carry cart as a transport vehicle, and FIG. 2 shows a partial bottom view thereof. This carry cart is provided with two pairs of free casters 6, 6 at the front and rear of the bottom of the carriage frame 1, with a pair of fixed casters 5, 5 at the center bottom, and shelf frames on both sides of the carriage frame 1. 7 and 7 are erected.

  The bogie frame 1 is composed of a vertical frame 3 and a horizontal frame 2, and is formed in a substantially king-shaped shape in plan view. Casters 5 and 5 are mounted, and a pair of free casters 6 and 6 are attached to the bottoms of both sides of the lateral frame 2 at the front and rear ends of the carriage frame 1, respectively.

  The horizontal frames 2 before and after the carriage frame 1 are formed in a rectangular box shape that opens downward, and a free caster holding member 34 to which the free casters 6 and 6 are fixed is disposed inside the horizontal frame 2 so as to be movable up and down. Yes. In addition, a rectangular cylindrical shelf frame holding portion 4 is vertically fixed to the center of the upper surface of the front and rear horizontal frames 2, and the base portions 8 of the shelf frames 7 and 7 are formed inside the shelf frame holding portion 4 from above. Inserted and fixed with screws.

  The shelf frame holding portion 4 has an end portion of the vertical frame 3 of the carriage frame 1 that is separated from the upper surface of the horizontal frame 2 and fixed in a horizontal direction. The central portion of the vertical frame 3 is fixed to the upper surface side of the central horizontal frame 2. Thus, the bogie frame 1 has a configuration in which the vertical frame 3 is positioned above the horizontal frame 2. When the base plate 30 on the bogie frame 1 is opened upward to be in the undulated state, the horizontal direction of the bogie frame 1 ( From the left and right directions, the carriage frames 1 of other carry carts can be overlapped so as to be adjacent to each other and nested.

  The base plate 30 is divided into two in the front-rear direction on the carriage frame 1 and is configured to open its center portion upward in a double-spread manner. The end portion of the base plate 30 is located above the center portion via a pivot 31. It is held so that it can be pivoted so as to open, and can be raised and lowered. A concave portion is formed on the bottom surface of each base plate 30, and when lying down, the vertical frame 3 enters the concave portion, and the left and right end portions of each base plate 30 are placed on the upper surface of the horizontal frame 2. In addition, a holding portion for holding the vertical frame 3 is provided in the concave portion at the bottom of the base plate 30. When the base plate 30 is in a lying state, the holding portion holds the vertical frame 3 so that the cart The backlash of the base plate 30 at the time of use is prevented.

  Further, as shown in FIG. 3, a universal caster elevating mechanism 33 that elevates and lowers the free casters 6 and 6 according to the undulation operation (rotation operation) of the base plate 30 is provided at the pivotal support portion 31 that pivotally supports each base plate 30. Is provided. The universal caster elevating mechanism 33 has a vertical cylindrical base 8 fixed to the lower part of the cart frame 1 and the shelf frame 7. Inside the base 8, an elevating part 36 that moves only in the vertical direction while being guided by the inner wall surface of the base 8 is accommodated in a vertically slidable manner. The elevating part 36 is formed in a cylindrical shape with a substantially U-shaped cross section and can be raised and lowered. The lower end of the elevating part 36 is fixed to the upper surface of a rectangular box-shaped universal caster holding member 34 opened upward by welding or the like.

  As shown in FIG. 3, the universal caster holding member 34 is partially inserted from below into the rectangular box-shaped horizontal frame 2 that opens downward. The universal caster holding member 34 is attached to the horizontal frame 2. On the other hand, it can move up and down. Further, a horizontal elevating shaft portion 35 is mounted through the upper wall portion of the elevating portion 36. That is, the horizontal elevating shaft portion 35 is inserted through the through holes formed in the left and right side wall portions of the elevating portion 36 and is fixed and attached with the clasp.

  As shown in FIG. 3, vertical holes 38 are formed in the left and right side walls of the base 8, and the horizontal elevating shaft 35 is inserted into the long holes 38. Further, a horizontal fixed shaft portion 37 is attached to the left and right side wall portions of the base portion 8 at an upper position near the long hole 38. The horizontal fixed shaft portion 37 is inserted through through holes formed in the left and right side wall portions of the base portion 8 and is fixed by a stopper. A rotating arm 40 is provided between the horizontal elevating shaft portion 35 and the pivotal support portion 31 of the base plate 30.

  The rotating arm 40 has a rotating shaft portion that is rotatably fitted to the horizontal elevating shaft portion 35 at a base portion thereof, and is rotatable about the horizontal elevating shaft portion 35. The rotating shaft portion of the rotating arm 40 is formed of a cylindrical member, and one end of a curved plate portion curved in a crank shape is fixed to the upper end of the rotating shaft portion by welding or the like. That is, the pivot arm 40 is formed in a crank shape, and when the pivot arm 40 is pivoted upward, the curved portion rises and contacts the horizontal fixed shaft portion 37. Further, by the upward rotation of the rotation arm 40, the horizontal elevating shaft portion 35 receives a downward pressing force and moves downward.

  A pair of fixed casters 5 and 5 attached to the bottom of the horizontal frame 2 at the center of the carriage frame 1 are operated by depressing (depressing) the brake pedal 11 so that the brake shoe 12 is mounted on the fixed casters 5 and 5. A brake device 10 is provided that presses against and applies a brake.

  In this brake device 10, a pair of brake shoes 12, 12 that press the upper parts of the wheels of the fixed casters 5, 5 to apply a brake project downward from both sides of the brake shoe support rod 13, and the brake pedal 11 A straight brake arm 15 attached to the crank part at the end is pivotally supported by a pivoting part 16 provided at the bottom of the vertical frame 3 of the carriage frame 1 so as to be swingable. Further, the brake arm 15 and the brake shoe support bar 13 are arranged orthogonally, and the vicinity of the intersection of the brake arm 15 and the brake shoe support bar 13 is link-coupled via the link coupling part 14. The brake shoe support rod 13 and the brake shoes 12, 12 are pushed down to apply a brake by turning downward with the support portion 16 as a fulcrum.

  As shown in FIG. 4, the brake arm 15 is configured by arranging two linear metal rods side by side, and a pivotal support portion 16 is formed by welding a metal tube to the tip of the linear brake arm 15. The end is bent at a right angle to the lower side to form a crank portion, and a metal brake pedal 11 is welded horizontally to a horizontally bent portion at the end of the crank portion. In addition, a link coupling portion 14 is formed in the middle portion near the pivot portion 16 at the tip end of the brake arm 15 in a form in which a pin is inserted into the hole and linked.

  On the other hand, as shown in FIGS. 6 and 8, the brake shoe 12 is formed in a rectangular box shape having an open lower end, and the upper end of the wheels of the fixed casters 5 and 5 is pressed by the lower end surface to apply the brake. In addition, the brake shoe support rod 13 is protruded downward from the bottom of both side ends of the brake shoe support rod 13 via an adjusting screw 12a. That is, the adjustment screw 12a (for example, a bolt) is fixed to the upper part of the rectangular box-shaped brake shoe 12 having an open lower end so as to protrude upward. On the other hand, a screw hole 13a is provided at the bottom near both ends of the brake shoe support rod 13 by fixing a nut, for example, and an adjusting screw 12a is screwed into the screw hole 13a from below, so that the protruding length of the brake shoe 12 is increased. Is adjustable. Although not shown, the adjusting screw 12a can be fixed to the brake shoe support bar 13 at an arbitrary position by screwing a fixing nut onto the tip of the adjusting screw 12a and tightening.

  A link coupling portion 14 projects from the upper center of the brake shoe support bar 13. As shown in FIG. 6, the brake shoe support rod 13 and the brake arm 15 are arranged so as to be orthogonal to each other with the link coupling portion 14 as an intersection, and pins are inserted into the holes of the link coupling portions 14 and 14 at the intersection. Thus, the link coupling portion 14 of the brake arm 15 and the link coupling portion 14 of the brake shoe support bar 13 are linked. The link coupling portion 14 of the brake shoe support rod 13 is formed in a slightly vertically long shape, and is disposed so as to protrude through the upper surface plate of the horizontal frame 2 positioned on the lower side and in the vertical frame 3 positioned on the upper side. .

  Further, as shown in FIG. 8, guide holes 13b are formed in the vertical direction on both sides of the brake shoe support rod 13, and the guide rod 20 is vertically arranged in the horizontal frame 2 at a position corresponding to the guide hole 13b. It is attached in the direction. When the brake shoe support bar 13 is mounted in the horizontal frame 2, the guide bar 20 is inserted into the guide hole 13b, and can be moved up and down while being guided within a predetermined range.

  As shown in FIGS. 2 and 3, such a brake arm 15 of the brake device is disposed in the vertical frame 3 of the carriage frame 1 so as to accommodate the linear portion and the pivot portion 16. Via the vertical frame 3. A brake shoe support bar 13 having brake shoes 12 attached on both sides is housed in the horizontal frame 2 on the lower side of the vertical frame 3 and is guided by the guide bar 20 so as to be movable up and down.

  The link coupling portion 14 of the brake shoe support bar 13 penetrates through the opening provided in the center of the horizontal frame 2 and enters the vertical frame 3, and the link coupling portion 14 in the middle portion of the brake arm 15 is inserted via a pin. Linked together. Further, the brake shoe 12 projecting from the bottom of both sides of the brake shoe support rod 13 via the adjusting screw 12a so as to be adjustable in height passes through an opening opened at the upper part of the bracket of the fixed caster 5 and passes through the inside of the bracket. It is the structure which presses the upper part of the wheel of a caster from the top.

  The end portion of the brake arm 15 is bent at a right angle downward as a crank portion, and a portion extending downward penetrates the horizontal frame 2 and the free caster holding member 34 downward through a through hole provided in the horizontal frame 2. The distal end of the brake arm 15 bent at a right angle downward is bent horizontally, and the brake pedal 11 is fixed horizontally at the distal end. A brake spring 19 is mounted between the vicinity of the bent portion of the brake arm 15 and the vertical frame 3, and the brake spring 19 constantly urges the brake arm 15 to the non-brake side.

  Further, as shown in FIG. 3, the brake lock member 17 is swingably attached to the bottom of the free caster holding member 34 below the horizontal frame 2 via a shaft 17a. The brake lock member 17 is formed in a U shape in a plan view, and a horizontal shaft 17a is pivotally supported on the upper portion, and is supported so as to be swingable through the shaft 17a. Further, locking portions 17 b for locking the brake pedal 11 are formed at the lower portions on both sides of the brake lock member 17. A torsion spring (not shown) is mounted on the shaft 17a, and the brake lock member 17 is urged toward the side where the brake pedal 11 is locked to the locking portion 17b by the torsion spring. When the brake pedal 11 is depressed, the brake pedal 11 is locked to the locking portion 17b of the brake lock member 17 and locked in a state where the brake is applied. When releasing the brake, a brake release pedal 18 described later is operated. Thus, the brake lock member 17 is swung, and the brake pedal 11 is unlocked.

  A brake release pedal 18 is attached to the right side of the brake lock member 17, and when the brake release pedal 18 is stepped downward when the brake lock member 17 locks the brake as shown in FIG. The brake pedal 11 is disengaged from the locking portion 17b, and the brake is released.

  Next, the operation of the brake device 10 of the carry cart having the above configuration will be described. When the brake shoe 12 is away from the fixed caster 5, that is, when the brake pedal 11 is not depressed, the fixed caster 5 as shown in FIG. Is in a brake-released state, and the carry cart can be moved as an original transport vehicle.

  On the other hand, in order to use the carry cart as a merchandise display shelf, when the brake is applied and the brake is locked, the brake pedal 11 is depressed. When the brake pedal 11 is depressed, as shown in FIG. 7, the brake arm 15 rotates clockwise about the pivotal support portion 16 at the tip thereof and is connected to the intermediate portion of the linear brake arm 15. The brake shoes 12 at both ends of 13 are pushed down, and the upper part of the wheel of the fixed caster 5 is pressed, and the fixed caster 5 is braked and locked. At this time, since the vertical movement of the brake shoe support bar 13 is guided by the guide hole 13b and the guide bar 20, the brake shoes 12 at both ends move up and down stably and a stable braking force acts.

  Further, the brake operating force for depressing the brake pedal 11 is a brake shoe support rod as a moment for rotating the brake arm 15 about the pivot portion 16 through the straight portion of the crank portion bent at right angles to the crank shape. 13 and applied to the brake shoe 12. At this time, since the portion from the pivotal support portion 16 of the brake arm 15 to which the load is most applied as a braking force to the link coupling portion 14 and the front side of the crank portion is formed in a straight line, the brake arm 15 is good and serves as a lever. By acting, the lever action can amplify the brake operation force and apply it to the wheel from the brake shoe 12 to lock the fixed caster 5.

  Furthermore, when a brake arm that normally acts as a lever is bent and a bending load is applied in the bending direction, the bent portion is likely to be plastically deformed in the bending direction, but the brake arm that causes the straight portion to act as a lever In No. 15, it is possible to apply a large load without causing plastic deformation, thereby enabling strong braking.

  Further, since the brake shoe 12 that is pushed down during the brake operation presses the wheel of the fixed caster 5 on the floor from above, a braking force is applied so that the wheel is sandwiched between the brake shoe 12 and the floor surface. Thus, a large braking force can be applied and the wheels can be reliably locked.

  Then, when the brake pedal 11 is depressed and the brake arm 15 is rotated, the brake pedal 11 is locked to the locking portion 17b of the brake lock member 17 as shown in FIG. 7, and the brake state is locked. In this state, the wheels of the fixed casters 5 are pressed by the brake shoes 12, and the brake lock state is maintained.

  On the other hand, when releasing the brake, the brake release pedal 18 is depressed. When the brake release pedal 18 is depressed, the brake lock member 17 rotates in the clockwise direction in FIG. 7, and the brake pedal 11 locked to the locking portion 17b is disengaged. 19 is rotated upward by the urging force of 19, the brake shoe 12 is lifted via the link coupling portion 14 and the brake shoe support rod 13, is separated from the wheels of the fixed caster 5, and the brake is released.

  On the other hand, since the vertical position of the brake shoe 12 can be adjusted by the screwing amount of the adjusting screw 12a provided on the upper part of the brake shoe 12, when the brake force is reduced due to bending deformation of the brake arm 15, the brake shoe is supported. The brake force can be adjusted by adjusting the vertical position of the brake shoe 12 with respect to the rod 13.

  As described above, according to the brake device for a transport vehicle of the present invention, the brake arm has a bent portion from the pivotal support portion at the tip thereof to the front side of the brake pedal bent in a crank shape via the link coupling portion. Because it is formed and arranged with a straight part with no straight line, to use a linear brake arm as a lever bar, amplify the brake operation force by lever action and press the brake shoe against the wheel to apply the brake, The brake can be applied strongly, and the straight portion of the brake arm is less likely to be deformed, and a stable braking force can be generated for a long period of time. Furthermore, the brake shoe that is pushed down during brake operation presses the upper part of the wheel of the fixed caster against the floor, so that a braking force is applied so that the wheel is sandwiched between the brake shoe and the floor surface. Thus, a large braking force can be applied to securely lock the wheel. Also, because the brake shoe can be adjusted in its vertical position by the screw amount of the adjustment screw provided on the upper part of the brake shoe, when the braking force is reduced due to bending deformation of the brake arm, etc. The brake force can be adjusted by adjusting the vertical position of the shoe.

1 is a perspective view of a transport vehicle according to an embodiment of the present invention. It is a partial bottom view of the transport vehicle. It is sectional drawing which shows the brake device of the transport vehicle. (A) is a top view of the brake arm of the brake device, and (b) is a side view of the brake arm. (A) is a front view of the brake shoe support bar of the brake device, and (b) is a side view of the brake shoe support bar. It is a top view of a brake arm and a brake shoe support rod. It is sectional drawing which shows the brake device at the time of brake operation. It is a perspective view of a brake shoe and a brake shoe support rod.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bogie frame 2 Horizontal frame 3 Vertical frame 5 Fixed caster 6 Swivel caster 10 Brake device 11 Brake pedal 12 Brake shoe 12a Adjustment screw 13 Brake shoe support rod 13a Screw hole 13b Guide hole 14 Link coupling part 15 Brake arm

Claims (1)

A brake device for a transport vehicle, wherein a pair of fixed casters is provided at substantially the center of the bottom of the carriage frame, and the fixed casters are braked by operation of a brake pedal,
A pair of brake shoes that press the upper part of the wheels of the pair of fixed casters to apply a brake are attached to both sides of the brake shoe support bar so that the height can be adjusted downward, and the brake pedal is attached to the end. A straight brake arm is pivotally supported at a pivotal support portion provided at the bottom of the carriage frame, and the brake shoe support rod is disposed perpendicular to the brake arm, and a link coupling portion. The brake device is connected to the intermediate portion of the brake arm via the brake arm, and a linear portion is formed between the pivot support portion of the brake arm and the link coupling portion.
The brake shoe is formed in a rectangular box shape having an opening at the lower end, and is formed by protruding an adjustment screw on the upper portion, and screw holes are provided at both end portions of the brake shoe support rod,
The adjustment screw is screwed into the screw hole and attached so as to be adjustable in height, and a fixing nut for fixing the height-adjusted adjustment screw to the brake shoe support rod is provided on the tip side of the adjustment screw. Screwed together,
The brake shoe support rod is formed with guide holes in the vertical direction on both sides of the intermediate portion between the link coupling portion and the brake shoe, and the guide holes on the both sides are formed in the vertical direction in the horizontal frame of the carriage frame. A brake device for a transport vehicle, wherein each of the attached guide rods is inserted .

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