JP2009298197A - Wagon for sales in vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wagon for sales in a vehicle provided with a brake device in which a waste rubber is not dropped off on a floor surface when a caster is braked and rolling of the caster can be certainly braked even if the total weight of the wagon is relatively large. <P>SOLUTION: The wagon 1 for sales in the vehicle includes longitudinal directions X, Y, a load-carrying platform 2; a pair of casters 3a, 3a, 3b, 3b mounted to the front side X and the rear side Y on a bottom surface of the load-carrying platform 2; and the brake device 6 for braking at least the casters 3b, 3b positioned at the rear side of the casters 3a, 3a, 3b, 3b. The brake device is an inner enlargement type drum brake device 6 including a circular drum 13 integrally rotated with the casters 3b, 3b; and a brake action part for braking the casters 3b, 3b by abutting it on an inner peripheral surface 13a of the drum 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wagon for in-car sales used in a train such as a bullet train, and more particularly to a brake device for a caster of a wagon.

Conventionally, in order to smoothly and safely sell trains such as Shinkansen trains, the brakes are applied when the wagon is not operated, that is, when the seller releases both hands from the operating lever provided at the rear end of the loading platform. A wagon for in-car sales is known that includes a brake device that operates and is capable of rolling a caster when the brake is released and the control lever is gripped. For example, Patent Document 1 includes an operation lever, a link rod on which the operation lever is attached, and a brake shoe connected to the link rod.
Utility Model Registration No. 3050213

  In the wagon disclosed in Patent Document 1, since the rod-shaped lining member is in contact with the caster when the wagon is not operated, the wagon does not move inadvertently during in-vehicle sales. Further, when the wagon is moved, when the salesperson grasps the operation lever, the link rod is pulled up and the lining member is separated from the caster, so that the brake can be easily removed.

  However, when the wagon is moving, when the lining member is slid directly into contact with the caster and the rolling of the caster is restrained by the frictional resistance, the lining is usually made of natural or synthetic rubber. Therefore, rubber scraps are generated on the sliding contact surface due to friction, and the rubber scraps may fall on the floor surface every time they are stopped. It is troublesome to collect such rubber scraps after moving the wagon, and because carpets are laid on the floor surface in cars such as the Shinkansen, rubber scraps are scattered on the floor surface. It is not preferable in appearance.

  Also, the larger the total weight of the wagon, the greater the rotational torque of the caster. Therefore, when the wagon is loaded with food and drinks and souvenirs and the total weight exceeds 100 kg, the lining member is directly attached to the caster in this way. It is difficult to stop the caster that is rolling only by the brake device that is in sliding contact. In addition, the inside of a train such as the Shinkansen can be shaken greatly when the train is braked, so that even if a shake occurs, the braking force does not cause the stopped wagon to start moving freely. Is required.

  Therefore, in the present invention, when the rolling of the caster is stopped, the rubber scrap does not fall on the floor surface, and the rolling of the caster is ensured even if the total weight of the wagon is relatively large. The challenge is to provide a wagon for in-car sales with a brake device that can be stopped.

  In order to solve the above-mentioned problems, the present invention is directed to a front-rear direction, a cargo bed, a pair of casters attached to the front and rear of the bottom surface of the cargo bed, and at least the rear of the casters. And a brake device for braking a pair of casters.

  The present invention is characterized in that the brake device includes an arc-shaped drum that rotates integrally with the caster and a brake operation unit that abuts against an inner peripheral surface of the drum and brakes the caster. It is a drum brake device of the type.

The present invention includes the following preferred embodiments in addition to the features described above.
(1) The brake operating portion has an arc shape, is disposed to face the inner peripheral surface of the drum, and has an outer diameter that can be expanded, and is fixed to the outer surface of the brake shoe. A lining member formed, an operation lever capable of moving up and down extending from a rear end of the loading platform, a cam mechanism having a rotatable cam that expands the diameter of the brake shoe, and a cord connected to the operation lever; One end is connected to the cord, the other end is connected to the cam mechanism, and includes an arm that rotates the cam in conjunction with the vertical movement of the cord, and the brake shoe is a pair of semicircular arcs Between the end of the first movable part and the end of the second movable part facing the end of the first movable part. Located in front of and abutting them The cam is rotated by the code is pulled upward, the said brake shoe is pressed in a direction in which the first end portion of the movable portion and the end portion of the second movable portion are separated from each other is enlarged.
(2) The drum brake device includes: a base plate having a circular support portion to which the brake shoe is fixed; an extension portion extending outward from the support and facing away from the arm; and the brake shoe. It further includes a fixed U-shaped first spring element, and a coil-shaped second spring element interposed between the arm and the extending portion and biasing them in a direction away from each other.
(3) A coil-shaped third spring element is arranged in parallel with the second spring element between the arm and the extending portion.

  In the present invention, a brake device for an in-car sales wagon used in a train such as a Shinkansen train, and an arc-shaped drum that rotates integrally with a caster, and a lining member slidingly contact the inner peripheral surface of the drum to brake the caster. Because it is an inward-expanding drum brake device that includes a braking action part that performs, even if the total weight of the wagon exceeds 100 kg, it should reliably stop the caster and stop the wagon Can do. Further, according to this brake device, when the brake is operated, the lining member made of the rubber member is slidably contacted with the inner peripheral surface of the drum inside the drum, so that the rubber waste generated by the slidable contact is discharged outside the drum. There is nothing, and rubber scraps are not scattered on the floor of trains such as the Shinkansen lined with carpets.

  1 is a perspective view of a wagon 1, FIG. 2 is a partially broken perspective view of a drum brake device 6, FIG. 3 is an exploded perspective view of the drum brake device 6, and FIG. 4 is a cam mechanism as viewed from an arrow IV in FIG. FIG. In FIG. 1, the front of the wagon 1 is indicated by X and the rear is indicated by Y.

  As shown in FIG. 1, the wagon 1 includes a loading platform 2 having a plurality of tray shelves, a pair of casters 3a, 3a; 3b, 3b attached to the bottom surface of the loading platform 2 and facing each other in the front-rear direction X, Y; An operation lever 4 extending from the rear end of the loading platform 2 to the rear Y and capable of moving up and down, and a gripping portion 5 positioned below the operation lever 4 and facing the operation lever 4 in the vertical direction while being separated from each other in the braking state of the wagon 1. And an inwardly expanding drum brake device 6 for braking the casters 3b, 3b located in the rear Y. In the present embodiment, the drum brake device 6 is attached only to the casters 3b, 3b located in the rear Y, but if necessary, not only the rear Y casters 3b, 3b but also the casters 3a located in the front X. , 3a may be attached.

  The loading platform 2 has a flat convex shape, and fixes side plates 8a and 8b for supporting tray shelves arranged in parallel at a given distance in the vertical direction, and the lower ends of the side plates 8a and 8b. And a frame-like bottom plate 9 that forms A connecting end 4a of the operation lever 4 extends on the inner surfaces of the side plates 8a and 8b, and an upper end 10a of a cord 10 extending downward is connected to the connecting end 4a.

  The cord 10 further includes a lower end portion 10b fixed to the arm 11 of the drum brake device 6 extending forward X from the back surface of the casters 3b, 3b, and the arm 11 is operated by an operating lever via a link mechanism (not shown). These are connected to these so as to interlock with the vertical movement of 4. More specifically, when the operation lever 4 is pushed down, the arm 11 is pulled upward, the drum brake device 6 is released, and from the position where the operation lever 4 is pushed down upward, that is, the original position. When it is returned to the position, the arm 11 moves downward to return to the original position, and the drum brake device 6 operates.

  2, 3, and 4, the drum brake device 6 includes a fixed frame 12 that is fixed to the lower surface of the bottom plate 9, an arc-shaped drum 13 that rotates integrally with the casters 3 b and 3 b, And a brake actuating portion 14 that slidably contacts the inner peripheral surface and brakes the casters 3b, 3b. The casters 3b and 3b including the fixed frame 12, the drum 13 and the brake operating unit 14 are connected by a shaft 15 penetrating them.

  The fixed frame 12 has an upper end portion 12a fixed to the lower surface of the bottom plate 9, a first side portion 12b and a second side portion 12c extending downward from the upper end portion 12a, and the first side portion 12b includes A square hole 16 is formed, and a circular hole 17 and a hole 18 located above the hole 17 are formed in the second side portion 12 c so as to face the square hole 16.

  The drum 13 has a circular bottom portion 19, an outer peripheral wall portion 20 that protrudes outward from the peripheral edge of the bottom portion 19, and an inner surface forming an inner peripheral surface 13 a of the drum 13, and a first shaft through hole 21 a provided in the center. And a bearing 21 protruding from the outer peripheral edge of the first shaft through hole 21a and having a bearing (not shown) incorporated in the inner periphery thereof.

  The brake operation unit 14 includes a base plate 25 having an arcuate brake shoe 24 disposed along the inner peripheral surface 13a of the drum 13, and a lining that slides on the inner peripheral surface 13a of the drum 13 to brake the casters 3b and 3b. The members 26 a and 26 b, the cam mechanism 27 that expands the brake shoe 24, and the arm 11 that is connected to the cam mechanism 27 and interlocks the cord 10 and the cam mechanism 27.

  The brake shoe 24 has a semicircular arc shape, and includes a first movable portion 28 and a second movable portion 29 having rubber lining members 26 a and 26 b fixed to the outer surface thereof. The end portion 28 a and the first end portion 29 a of the second movable portion 29 face each other via the cam mechanism 27, and the second end portion of the first movable portion 28 and the second end portion of the second movable portion 29 are opposed to each other. Are fixed to each other via a pivot 30 having a male screw portion, thereby forming an arc shape. The first end portion 28a of the first movable portion 28 and the first end portion 29a of the second movable portion 29 opposed thereto are in contact with the rotatable cam 33, and an opening portion is formed at the center of the brake shoe 24. 32 is formed.

  Between the brake shoe 24 and the base plate 25, the 1st spring element 34 which consists of a pair of latching piece 34a, 34b which has a U-shape and the opposing edge part protrudes outward is interposed. The locking pieces 34a and 34b are inserted into the through holes near the first end portions 28a and 29a of the first and second movable portions 28 and 29, respectively. As described above, since the first spring element 34 is attached to the first and second movable portions 28 and 29, the brake shoe 24 is urged in the radial direction by the contracting action of the first spring element 34 to be circular. While exhibiting an arc shape, the expansion and contraction can be repeated according to the operation and non-operation of the drum brake device 6.

  The cam mechanism 27 includes a short rectangular cam 33, a rod 35 that can rotate the cam 33, and has a male screw portion, and a pin 36 that is fixed to the cam 33 from above. When the drum brake device 6 is released, the cam 33 is parallel to the first end portion 28a of the first movable portion 28 and the first end portion 29a of the second movable portion 29, and both side portions 33b that abut against them. 33c. Reinforcing members 37a and 37b made of steel plates are fixed to the first end portion 28a of the first movable portion 28 and the first end portion 29a of the second movable portion 29 by rivets, and the cam 33 of the reinforcing members 37a and 37b. The surface that abuts slightly protrudes outward, and the projecting portion abuts the lower end of the pin 36. Thereby, even if the brake shoe 24 repeatedly expands and contracts, the positions of the first end portion 28a of the first movable portion 28 and the first end portion 29a of the second movable portion 29 are not shifted and do not come outward. .

  Referring to FIGS. 2 and 3 again, the base plate 25 has a circular dish shape, a second shaft through hole 38 at the center, and an extending portion (not shown) extending from the periphery to the back side, A support portion 40 having a cylindrical portion 39 fitted into the bearing 21 of the drum 13 when the drum brake device 6 is assembled; an L-shaped extension portion 41 extending outward from the back surface of the support portion 40; A tongue piece 41a protruding upward from the extending portion 41; The support part 40 has a through hole 42, a projecting part 43 that is spaced from and opposed to the through hole 42 through the cylindrical part 39, and a locking piece 44 that projects to the back side. A hole 45 is formed in the tongue piece 41a, and a hole 46 and an insertion hole 47 that communicates with a notch 47a that cuts out the edge of the extension 41 are formed in the extension 41.

  The arm 11 has a pointed first end portion 11a, a second end portion 11b slightly bent downward, and a fixing portion 49 extending to the back side. A square hole 50 is formed between the first end portion 11 a and the fixing portion 49, a hole 51 is formed in the second end portion 11 b, and a hole 52 is formed in the fixing portion 49. In the extension portion 41, the covering member that forms the outer surface of the cord 10 is fixed by the fixture 54, and the wire 48 exposed from the cord 10 is inserted into the insertion hole 47 from the notch 47 a, It is fastened by a nut 55 in the hole 51 of the second end portion 11b of the opposite arm 11 (see FIG. 2).

  The arm 11 and the extension part 41 are spaced apart from each other in the up-down direction in the operating state of the drum brake device 6. Between the arm 11 and the extension part 41, a coiled second spring element 57 and A third spring element 58 is fixed in parallel. Specifically, the second spring element 57 has an upper end fixed by a bolt 60 inserted into the round hole 46 of the extending portion 41 and a lower end fixed by a bolt 61 inserted into the round hole 52. And located on the fixed portion 49. Further, the third spring element 58 is fixed between the second end portion 11 b of the arm 11 and the extending portion 41 so that the wire 48 penetrates the inside thereof. Thus, since the 2nd spring element 57 and the 3rd spring element 58 are being fixed between the arm 11 and the extension part 41, arm 11, the extension part 41, and the like are expanded by their pressure expanding action. Are biased in directions away from each other.

  In the brake operation unit 14 having such a configuration, in the assembled state, the male thread portion of the pivot 30 is connected to the support portion 40 with the first spring element 34 interposed between the support portion 40 and the brake shoe 24. The rod 35 is inserted into the screw hole 42 and tightened by a washer 64 and a nut 65, and the male screw portion of the rod 35 is inserted into the through hole of the protruding portion 43, and the rod 35 is inserted into the square hole 50 of the arm 11. The arm 11 is pivotally attached by a washer 66 and a nut 67. As a result, when the rod 35 is rotated by the vertical movement of the arm 11 and the arm 11 is positioned below, the cam 33 increases the outer diameter of the brake shoe 24, so that the lining members 26a and 26b of the brake shoe 24 are increased. Can be pressed against or slidably contacted with the inner peripheral surface 13a of the drum 13 to brake the casters 3b and 3b. On the other hand, when the operating lever 4 is pushed down and the arm 11 is pulled upward, the cam 33 Both side portions 33b and 33c are in contact with the first end portion 28a of the first movable portion 28 and the first end portion 29a of the second movable portion 29 in parallel, and the brake shoe 24 contracts in the circumferential direction. Therefore, the lining members 26a and 26b are separated from the inner peripheral surface 13a of the drum 13, and the casters 3b and 3b can rotate.

  In the assembled state of the drum brake device 6, the brake shoe 24 is fitted and inserted into the drum 13 so that the lining members 26 a and 26 b face the inner peripheral surface 13 a of the drum 13, and the cylindrical portion 39 of the support portion 40. Is inserted into the bearing 21 of the drum 13, and the brake operating portion 14 and the fixed frame 12 include a bolt 69 inserted into the hole 18 of the second side portion 12 c and the hole 45 of the tongue piece 41 a of the base plate 25, It is fixed by washers 70 and 71 and a nut 72. The shaft 15 includes a square hole 16 in the first side portion 12 b of the fixed frame 12, a first shaft through hole 21 a in the drum 13, an opening 32 in the brake shoe 24, and a second shaft through hole in the support portion 40. 38 and the hole 17 of the second side portion 12c of the fixed frame 12, and these members are connected by being fastened by washers 73 and 74 and a nut 75.

  In addition, each member constituting the drum brake device 6 may be partly or entirely formed as a single piece, and may be integrally formed. For fixing each member, in addition to using bolts and nuts, welding, Appropriate fixing means such as adhesion and screwing can be used.

  5A is a plan view of the brake operation unit 14 in a state where the drum brake device 6 is operated, and FIG. 5B is a plan view of the brake operation unit 14 in a state where the drum brake device 6 is released. . 5A and 5B, the drum 13, the inner peripheral surface 13a of the drum 13, and the pin 36 of the cam mechanism 27 are indicated by broken lines for convenience of explanation.

  As shown in FIG. 5A, in the state where the drum brake device 6 is operated, that is, when the casters 3b and 3b are braked, the operation lever 4 is at a position spaced upward from the gripping portion 5, and the cord 10 is not pulled upward (arrow P), and the arm 11 and the extending portion 41 of the base plate 25 are urged away from each other by the pressure expanding action of the second spring element 57 and the third spring element 58. The cam 33 rotates against the bias of the first spring element 34. At this time, the cam 33 is inclined with respect to the first end portion 28a of the first movable portion 28 and the second end portion 29a of the second movable portion 29, that is, the entire side portions 33b and 33c are the The first corner 28a and 29a are not in contact with each other, the inner corner of the side portion 33b is the first end 28a of the first movable portion 28, and the outer corner of the side portion 33c is the second movable portion 29. Each one abuts against the one end portion 29 a and presses in the circumferential direction of the brake shoe 24. Thus, the brake shoe 24 is expanded in diameter by the cam 33 with the pivot 30 as a fulcrum so that the first movable portion 28 and the second movable portion 29 are separated from each other, and the lining members 26 a and 26 b are arranged on the inner periphery of the drum 13. When the wagon 1 is moving, the drum 13 is prevented from rotating by the frictional resistance with the inner peripheral surface 13a of the rotating drum 13 and the casters 3b and 3b are braked. Is done.

  On the other hand, as shown in FIG. 5B, when the drum brake device 6 is released, that is, when the casters 3b and 3b are not braked, the salesperson puts both hands on the operation lever 4 and holds the operation lever 4. By pushing down so as to overlap the holding portion 5, the cord 10 is pulled upward, whereby the arm 11 extends the base plate 25 against the pressure expansion action of the second spring element 57 and the third spring element 58. The second spring element 57 and the third spring element 58 contract by being pulled toward the portion 41 side. At this time, due to the contracting action of the first spring element 34, the first end 28a of the first movable portion 28 and the first end 29a of the second movable portion 29 press the both side portions 33b and 33c of the cam 33. The cam 33 rotates clockwise (arrow Q in FIG. 5A), and the first end 28a of the first movable portion 28 and the first end of the second movable portion 29 shown in FIG. From the state inclined with respect to the portion 29a, both side portions 33b and 33c become parallel to the first end portion 28a of the first movable portion 28 and the first end portion 29a of the second movable portion 29, and abut against them. ing. Accordingly, the brake shoe 24 is contracted in the circumferential direction, and the lining members 26a and 26b are separated from the inner peripheral surface 13a of the drum 13, so that the drum 13 is caused by frictional resistance due to pressure contact and sliding contact with the lining members 26a and 26b. The rotation of is never restrained.

  Thus, the brake device 6 uses the frictional resistance force when the inner peripheral surface 13a of the drum 13 and the lining members 26a and 26b are brought into pressure contact and sliding contact by moving the operation lever 4 up and down, The wagon 1 can be stopped reliably, and the wagon 1 can be safely operated when selling in the train by a train such as a bullet train.

  Further, in order to operate the brake device 6, the second spring element 57 and the third spring element 58 urge the arm 11 and the extending portion 41 in a direction away from each other, and the cam 33 interlocked with the arm 11. However, since the brake shoe 24 must be expanded in diameter against the bias of the second spring element 57 and the third spring element 58, the elastic force generated by the second spring element 57 and the third spring element 58 is the first. The spring element 34 needs to be larger than the elastic force. However, if any one of the second spring element 57 and the third spring element 58 has a required elastic force for performing such an action, only one of them has the arm 11 and the extension portion. 41 may be interposed.

  According to the inward-expanding drum brake device 6 as in the present invention, it is possible to apply a larger braking force to the caster than a brake device that brakes the caster by directly bringing the lining of the brake shoe into sliding contact with the caster. Even if the total weight of the wagon exceeds 10 kg, the caster can be reliably stopped.

  Further, since the lining member is usually made of natural or synthetic rubber, when the brake is applied, when the lining member is brought into sliding contact with a caster, a rim, or a drum, rubber scraps are generated on the sliding contact surface by friction. , Each time you stop, rubber scraps may fall on the floor. It is troublesome to collect such rubber scrap every time the wagon moves, and because the carpet is laid on the floor in trains such as Shinkansen, rubber scrap is scattered on the floor. This is also not desirable visually.

  However, in the drum brake device 6 of the present invention, the rubber waste generated when the lining members 26a and 26b are brought into sliding contact with the inner peripheral surface 13a of the drum 13 is accumulated inside the drum 13 and discharged to the outside. Because there is no, it will not fall to the floor. Further, as shown in FIG. 3, in the case of the assembly-type drum brake device 6, the brake shoe 24 can be removed from the drum 13, so that it is possible to easily collect rubber waste and replace the lining members 26a and 26b. it can.

The perspective view of a wagon. The partially broken perspective view of a drum brake device. The exploded perspective view of a drum brake device. The enlarged view of a cam mechanism. (A) The top view of the brake action part in the operation state of a drum brake device. (B) The top view of the brake action part in the release state of a drum brake device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wagon for in-vehicle sales 2 Carriage 3a, 3a Caster 3b, 3b Caster 4 Operation lever 6 Drum brake device 10 Cord 11 Arm 11a First end 11b of arm Second end 12 of arm Fixed frame 13 Drum 13a Inner circumference of drum Surface 14 Brake operation part 24 Brake shoe 25 Base plates 26a, 26b Lining member 27 Cam mechanism 28 First movable part 28a First movable part first end 29 Second movable part 29a Second movable part first end 33 Cam 34 First spring element 40 Support portion 41 Base plate extension 57 Second spring element 58 Third spring element X Front Y Back

Claims (4)

For in-vehicle sales, including a front-rear direction, a loading platform, a pair of casters attached to the front and rear of the bottom surface of the loading platform, and a brake device for braking a pair of casters positioned at least rearward among the casters In the wagon
The brake device is an inwardly expanding drum brake device including an arc-shaped drum that rotates integrally with the caster, and a brake operation unit that abuts on an inner peripheral surface of the drum and brakes the caster. The wagon characterized by the above. The brake operating portion has an arc shape, is disposed to face the inner peripheral surface of the drum, and has an outer diameter that can be expanded, and a lining fixed to the outer surface of the brake shoe. A member, an operation lever that can move up and down extending from a rear end of the cargo bed, a cam mechanism having a rotatable cam that expands the diameter of the brake shoe, a cord connected to the operation lever, and one end portion Connected to the cord, the other end is connected to the cam mechanism, and includes an arm that rotates the cam in conjunction with the vertical movement of the cord,
The brake shoe is formed of a pair of semicircular arc-shaped first movable part and second movable part,
The cam is located between and in contact with the end of the first movable part and the end of the second movable part facing the end of the first movable part;
When the cord is pulled upward, the cam rotates, and the end of the first movable part and the end of the second movable part are pressed away from each other, and the diameter of the brake shoe is increased. The wagon according to claim 1.   The drum brake device is fixed to the brake shoe, a base plate having a circular support portion to which the brake shoe is fixed, an extension portion extending outward from the support portion and facing the arm, and spaced apart from the arm. 2. A U-shaped first spring element, and a coil-shaped second spring element interposed between the arm and the extending portion and biasing them in a direction away from each other. 2. The wagon according to 2.   The wagon according to any one of claims 1 to 3, wherein a coiled third spring element is arranged in parallel with the second spring element between the arm and the extension portion.

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