JP2011225185A - Brake structure, and carry cart incorporating the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid an excessive wear of a cart wheel to be braked and make an appearance excellent.SOLUTION: In the brake structure, the brake is applied to the cart wheel 4 mounted to the lower end of a support 3 having a brake operation part 10 including a handle 2 and a brake lever 11 on the upper end. The brake structure includes members 31, 32 or the like which are provided in the inner part of the support 3 and to which the brake operation at the brake operation part 10 is transmitted, and a brake arm 54 which operates in cooperation with the members 31, 32 or the like to which the brake operation is transmitted. A brake pad 54c mounted to the brake arm 54 is pressed to the outer peripheral surface of a drum 8a of a wheel 8 of the cart wheel 4 to apply the brake to the cart wheel 4.

Description

  The present invention relates to a brake structure and a carry cart incorporating the same. More specifically, the present invention is a brake structure suitable for application to various carry carts such as a medical cart for medical equipment and medical materials such as oxygen cylinders and infusions, or a brake mechanism for walking assistance vehicles and walking vehicles. And a carry cart incorporating the same.

  As a conventional brake mechanism applied to a walking assistance vehicle, for example, as shown in FIGS. 17A and 17B, a pair of left and right opposingly attached to the lower end of the rear frame 108 via an axle 110 between wheels. A structure of a brake mechanism for the rear wheels 109, 109, a swing arm 101 attached to a position above the rear wheel 109 of the rear frame 108 via an intermediate swing shaft 102, and a rear end side of the swing arm 101 A brake pad 103 that is attached to the lower surface of the left and right rear wheels 109 and protrudes above the rear wheels 109, a brake lever 105 that is swingably attached below the grip 106 at the upper end of the front frame 107, and an upper end that is the brake lever 105. And a brake wire 104 whose lower end is connected to the front end of the swing arm 101. Then, by gripping the grip 106 and the brake lever 105 and swinging the brake lever 105 to pull up the wire 104, the swing arm 101 is swung up by pulling up the front end portion, and the lower surface on the rear end side of the swing arm 101 The brake pad 103 attached to the rear wheel 109 is pressed against the grounding surface (in other words, the outer peripheral surface) of the rear wheels 109 and 109, and the rear wheels 109 and 109 are braked by friction between the brake pad 103 and the grounding surface of the wheel. Yes (Patent Document 1).

JP 9-168414 A

  However, in the brake structure in the brake mechanism of Patent Document 1, the brake pad 103 is pressed against the ground contact surface of the rear wheels 109 and 109 so that the rear wheels 109 and 109 are braked by friction between the two. The wheel is grounded and the brake pads are pressed against the heavily worn parts and the friction is used to brake the wheels, which will accelerate the wear of the wheels and shorten the life of the wheels. There is a problem that it ends up.

  Further, in the brake structure of the brake mechanism of Patent Document 1, if the ground contact surface of the wheel is worn away and becomes smooth due to wear, friction between the brake pad 103 and the ground contact surface of the rear wheel 109 becomes small, and it is difficult to apply wheel braking. It is hard to say that safety is high.

  Further, in the brake structure in the brake mechanism of Patent Document 1, the brake pad 103 is pressed against the ground contact surface (that is, the outer peripheral surface) of the wheel via the swing arm 101, so that the swing arm 101 and the brake pad 103 are exposed. It is hard to say that the appearance is good.

  Therefore, an object of the present invention is to provide a brake structure capable of avoiding excessive wear of a wheel to be braked and improving the appearance, and a carry cart incorporating the brake structure.

  In order to achieve this object, the brake structure according to claim 1 is a brake structure for braking a wheel attached to a lower end of a post having a brake operation part including a handle and a brake lever at an upper end. A brake pad that is provided inside the brake and transmits a brake operation in the brake operation unit, and a brake arm that operates in conjunction with the member that transmits the brake operation, and is attached to the brake arm Is pressed against the outer peripheral surface of the drum of the wheel so as to brake the wheel.

  According to a second aspect of the present invention, in the brake structure according to the first aspect, the brake pad is attached to the upper surface of the brake arm, and the member to which the brake operation is transmitted by the brake operation at the brake operation unit is pulled up. The brake arm is lifted so that the brake pad is pressed against the lower outer peripheral surface of the wheel drum.

  A carry cart according to claim 6 incorporates the brake structure according to claim 1.

  Therefore, according to these brake structures and a carry cart incorporating the brake structure, the brake pad is not pressed against the wheel ground surface but is pressed against the wheel drum so that the brake is applied to the wheel. Is applied.

  According to a third aspect of the present invention, in the brake structure according to the first aspect, the brake pad is made of resin. In this case, an appropriate frictional force is exhibited between the brake pad and the wheel drum.

  According to a fourth aspect of the present invention, in the brake structure according to the first aspect, a mechanism for adjusting a position of the brake arm relative to a member to which the brake operation is transmitted to a connecting portion between the member to which the brake operation is transmitted and the brake arm. Is further provided. In this case, the distance between the drum of the wheel and the brake arm is adjusted by adjusting the position of the brake arm with respect to the member to which the brake operation is transmitted.

  According to a fifth aspect of the present invention, in the brake structure according to the first aspect, the strut includes an inner pipe and an outer pipe into which the inner pipe is slidably inserted, and a member to which a brake operation is transmitted. Has a first transmission member on the brake operation unit side and a second transmission member on the wheel side, and the first transmission member in accordance with the change in the overall length of the column due to the inner pipe being inserted into and removed from the outer pipe. By changing and fixing the connection point with the second transmission member, the brake operation at the brake operation section is transmitted to the brake arm via the first transmission member and the second transmission member even when the length of the column changes. To be. In this case, the length of the entire column is adjusted to adjust the height of the handle, and even when the height of the handle changes, the brake operation is reliably transmitted.

  According to the brake structure of claim 1, claim 2, and claim 6, and the carry cart incorporating the brake structure, the brake pad is pressed against the drum of the wheel so that the wheel is braked. Therefore, it is possible to avoid wear of the wheel due to a brake operation, to avoid shortening the service life of the wheel, and to improve the safety by reliably braking the wheel. In addition, since the brake arm and the brake pad can be arranged inside the wheel of the wheel, the appearance can be improved.

  According to the brake structure of the third aspect, the distance between the wheel drum and the brake arm can be adjusted so that the brake pad is completely separated from the wheel drum when the brake is not operated. At the same time, it is possible to brake the wheel with an appropriate amount of operation with respect to the brake lever, thereby improving the comfort of the brake operation.

  According to the brake structure of the fourth aspect, an appropriate frictional force can be exerted between the brake pad and the wheel drum, so that the safety can be further improved.

  According to the brake structure of the fifth aspect, the brake operation can be transmitted while the height of the handle can be adjusted, so that the convenience of the user can be improved. Become.

1 is a front perspective view showing a carry cart for an oxygen cylinder according to an embodiment to which a brake structure of the present invention is applied (the steering wheel uppermost state / four-wheel configuration). It is a back perspective view showing the carry cart for oxygen cylinders of the embodiment to which the brake structure of the present invention is applied (steering wheel uppermost state / four-wheel configuration). It is a front perspective view which shows the carry cart for oxygen cylinders of the embodiment to which the brake structure of this invention is applied (handle lowest position state / four-wheel form). 1 is a front perspective view showing a carry cart for an oxygen cylinder (handle uppermost state / two-wheel configuration) of an embodiment to which a brake structure of the present invention is applied. It is a schematic structure figure explaining the whole brake mechanism composition of an embodiment. (A) is the longitudinal cross-sectional view seen from the left. (B) is the longitudinal cross-sectional view seen from back. It is the longitudinal cross-sectional view seen from the left explaining the structure (state which the brake lever is not operated) which concerns on the operation part by the side of a handle among the brake mechanisms of embodiment. It is the longitudinal cross-sectional view seen from the left explaining the structure (state in which the brake lever is operated in order to operate a brake) concerning the operation part by the side of a handle among the brake mechanisms of an embodiment. It is the longitudinal cross-sectional view seen from the back explaining the structure (state which the brake lever is not operated) which concerns on the operation part by the side of a handle among the brake mechanisms of an embodiment. It is a disassembled perspective view explaining the structure which concerns on the connection transmission part of the brake operation in the support | pillar expansion-contraction part among the brake mechanisms of embodiment. It is a disassembled perspective view explaining the structure which concerns on the connection transmission part of the brake operation in the support | pillar expansion-contraction part among the brake mechanisms of embodiment. It is a cross-sectional view explaining the structure (state which the operation button is not operated) which concerns on the connection transmission part of the brake operation in the support | pillar expansion-contraction part among the brake mechanisms of embodiment. It is a longitudinal cross-sectional view explaining the structure (state in which the operation button is not operated) which concerns on the connection transmission part of the brake operation in the support | pillar expansion-contraction part among the brake mechanisms of embodiment. It is a longitudinal cross-sectional view explaining the structure (state in which the operation button is operated in order to expand and contract a support | pillar) which concerns on the connection transmission part of the brake operation in the support | pillar expansion / contraction part among the brake mechanisms of embodiment. It is a disassembled perspective view explaining the brake structure which concerns on the wheel braking part by the side of a front wheel among the brake mechanisms of embodiment. It is a figure explaining the brake structure which concerns on the wheel braking part by the side of a front wheel among the brake mechanisms of embodiment. (A) is a longitudinal cross-sectional view in the II line | wire of FIG. 15 (A). FIG. 15B is a longitudinal sectional view taken along line II-II in FIG. It is a figure explaining the brake structure which concerns on the wheel braking part by the side of a front wheel among the brake mechanisms of embodiment. FIG. 15A is a longitudinal sectional view taken along line III-III in FIG. FIG. 15B is a longitudinal sectional view taken along line IV-IV in FIG. It is a figure explaining the brake structure which concerns on the wheel braking part by the side of a front wheel among the brake mechanisms of embodiment. (A) is the front view which removed the surrounding wall of the front side of an outer side pipe. (B) is a longitudinal cross-sectional view in the VV line of FIG.14 (B). It is a bottom view explaining the brake structure concerning the wheel braking part on the front wheel side among the brake mechanisms of an embodiment. It is a side view showing the conventional brake structure applied to the brake mechanism of a walk auxiliary vehicle. It is a front view which shows the conventional brake structure applied to the brake mechanism of a walk auxiliary vehicle.

  Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

  FIG. 1 to FIG. 16 show an example of an embodiment of a brake structure of the present invention and a carry cart incorporating the same. In the present embodiment, the case where the brake structure of the present invention is applied to the brake mechanism of the oxygen cylinder carry cart 1 shown in FIGS. 1 to 3 will be described as an example. In the present specification, vertical, front / rear, and left / right are defined with reference to a person who holds the handle 2 and uses the oxygen cart carry cart 1.

  A carry cart 1 for an oxygen cylinder according to this embodiment includes a handle 2, a support column 3 to which the handle 2 is attached at the upper end, a front wheel 4 and a rear wheel 5 are attached, and a position closer to the lower end of the support column 3. And a pair of left and right base plates 6 and 6 which are arranged to be opposed to each other. In the oxygen cylinder carry cart 1 according to the present embodiment, the base plates 6 and 6 can swing with respect to the support column 3, and the four-wheel configuration (FIGS. 1A, 1B, and 2) and the two-wheel configuration (FIG. 3). Can be taken. In the oxygen cylinder carry cart 1 of the present embodiment, the support column 3 is further configured by an inner pipe 3A having a handle 2 attached to the upper end and an outer pipe 3B into which the inner pipe 3A is slidably inserted. The height of the handle 2 is adjusted by the inner pipe 3A being pulled into the outer pipe 3B or pulled out from the outer pipe 3B (the handle uppermost state: FIGS. 1A, 1B, and 3, the handle lowermost) State: Fig. 2). In the oxygen cylinder carry cart 1 of the present embodiment, the concentrated oxygen cylinder is placed in the car 9 attached to the front surface of the outer pipe 3B.

  And, the brake mechanism of the oxygen cylinder carry cart 1 of the present embodiment is broadly operated as shown in FIG. 4 in the brake operation at the operation portion 10 on the handle 2 side and the expansion / contraction portion at the upper end portion of the outer pipe 3B of the column 3. It consists of a connection transmission part 30 and a wheel braking part 50 on the front wheel 4 side. 4A, illustration of the rear wheel 5 and the base plate 6 is omitted, and in FIG. 4B, illustration of portions of the rear wheel 5 and the base plate 6 on the rear wheel 5 side is omitted.

(1) Operation Part Of the brake mechanism of the oxygen cylinder carry cart 1 of this embodiment, the operation part 10 on the handle 2 side will be described first.

  As shown in FIGS. 5 and 6, the operation unit 10 is connected to the handle 2, the brake lever 11, the brake block 12 provided in the handle 2, and the brake lever 11 and is swingable to the brake block 12. The first link 13 is supported, and the second link 14 is connected to the first link 13.

  The handle 2 includes a cylindrical support portion 2a and a grip 2b formed at the upper end of the support portion 2a. A slit 2c is formed at the upper end of the front peripheral wall of the support portion 2a (that is, below the grip 2b). The grip 2b is formed in an annular shape that projects forward from the upper end of the support portion 2a. In the present embodiment, the upper portion of the handle 2 (specifically, the upper half of the grip 2b and the portion corresponding to the lid of the cylindrical support portion 2a) are separate members, and the upper portion is removed. In this state, the members housed in the handle 2 and the column 3 are attached and assembled.

  The lower half of the support portion 2a is formed to have a smaller outer diameter than the upper portion and is inserted into the upper end portion of the inner pipe 3A. A cylindrical handle case 7 is attached to the outer periphery of the upper end of the inner pipe 3A. The handle 2 is fixed to the upper end of the inner pipe 3A by inserting and fixing the two bolts 7a, 7a penetrating the left peripheral walls of the handle case 7, the inner pipe 3A, and the support portion 2a. Is done.

  The brake lever 11 is supported by an annular grip 11a disposed below the grip 2b of the handle 2 and a slit 2c on the front peripheral wall of the handle 2 that extends rearward from the center of the rear end of the grip 11a. The swing support shaft 11b enters the portion 2a.

  The brake block 12 is attached to the upper end near the rear end in the support portion 2 a of the handle 2. Specifically, a vertical groove is formed on the inner peripheral surface of the left and right peripheral walls of the support portion 2a, and the brake block 12 is attached to the support portion 2a by inserting left and right end portions of the brake block 12 into the groove. It is done. The brake block 12 includes a base portion 12a and side walls 12b and 12b that extend upward from the left and right end portions of the base portion 12a and face each other (in other words, the brake block 12 is formed and arranged in a U-shape when viewed from the front). A through hole 12c is formed in each side wall 12b, 12b.

  The first link 13 is formed in a square plate shape, and the support portion 2a of the handle 2 is erected in a state where the square bent portion 13a is set to the front (that is, the brake lever 11 side) according to the position of the slit 2c. It is provided in the inside.

  And the bending part 13a of the 1st link 13 and the rear-end part of the rocking | fluctuation spindle 11b of the brake lever 11 are connected and fixed. In this embodiment, both are fixed by two bolts.

  Cylindrical engagement convex portions 13b and 13b are provided on the left and right side surfaces of the upper end portion of the first link 13 (specifically, the end portion extending obliquely upward and rearward from the bent portion 13a). The mating protrusion 13b is slidably fitted into the through hole 12c of the brake block 12. Accordingly, the first link 13 is attached to the support portion 2a of the handle 2 via the brake block 12 so as to be swingable about the engagement convex portion 13b.

  On the other hand, a cylindrical connecting convex portion 13c is provided on the right side surface of the lower end portion of the first link 13 (specifically, the end portion extending generally downward from the bent portion 13a).

  The brake lever 11 and the first link 13 are configured such that the swing support shaft 11b of the brake lever 11 contacts the lower end of the slit 2c on the front peripheral wall of the support portion 2a of the handle 2, and the upper end portion of the first link 13 is a brake block. When the brake lever 11 is not operated (in other words, when no force is applied), the downward swing is restricted and the position is fixed.

  The second link 14 is formed in a bowl-shaped plate shape, and is provided in the support portion 2a of the handle 2 with one tip directed forward (ie, the brake lever 11 side) and the other tip directed downward (see FIG. 5 and FIG. 6, strictly speaking, the lower end portion of the second link 14 protrudes from the lower end opening of the support portion 2a).

  A through-hole 14a is formed at the end of the second link 14 facing forward, with the front-rear horizontal direction being the longitudinal direction of the opening. And the connection convex part 13c of the 1st link 13 lower end part is slidably fitted by the said penetration long hole 14a, and, thereby, the 1st link 13 and the 2nd link 14 are the connection convex part 13c and the penetration long hole. 14a is connected in a slidable state.

  On the other hand, the upper end portion of the first transmission member 31 is attached to the end portion facing downward of the second link 14. In the present embodiment, the second link 14 and the first transmission member 31 are connected by the connecting pin 14d that passes through the through hole 14b at the lower end of the second link 14 and the through hole 31a at the upper end of the first transmission member 31. .

  According to the operation unit 10 having the above configuration, as shown in FIG. 5B, when the grip 2b of the handle 2 and the grip 11a of the brake lever 11 are clamped, the grip 11a is pulled up, and the brake lever 11 swings. The first link 13 connected to the support shaft 11b swings around the engaging projection 13b. Thereby, the lower end portion of the first link 13 is pulled up, the second link 14 connected to the first link 13 is pulled up via the connecting convex portion 13c of the lower end portion, and the lower end portion of the second link 14 The first transmission member 31 connected to is pulled up. In other words, a brake operation command given to the brake lever 11 by the user of the oxygen cylinder carry cart 1 and applied to the brake lever 11 is transmitted to the first transmission member 31 by the mechanism of the operation unit 10.

  A concave portion 14c in the vertical direction is formed at the upper end of the bent portion of the second link 14, and the brake pin 15 is engaged with the concave portion 14c. Further, in order to connect the first link 13 and the second link 14, the front-rear horizontal direction is generally the longitudinal direction at the end facing the front of the second link 14 as a through hole into which the connection convex portion 13 c of the first link 13 is fitted. A through long hole 14a is formed. With this configuration, the recess 14c and the brake pin 15 provide a guide function for moving the second link 14 straight in the vertical direction, and the first link 13 swings around the engagement protrusion 13b. When moving, the connecting projection 13c moves up and down while moving back and forth in the through-hole 14a. That is, when the first link 13 swings by operating the brake lever 11, the second link 14 and the first transmission member 31 move straight in the vertical direction.

  The brake pin 15 also functions as a brake lock. Specifically, the concave portion 14c of the second link 14 is composed of an upper band-shaped portion and a lower arc portion having a diameter larger than the width of the band-shaped portion, and the axis of the brake pin 15 is thin with a small diameter. It is comprised from the axial part 15a and the thick axial part 15b with a large diameter (inside the circle of FIG. 5B). In normal use in which the brake operation is repeatedly performed, the insertion position of the brake pin 15 is adjusted so that the thin shaft portion 15a of the brake pin 15 meshes with the concave portion 14c of the second link, and the oxygen cylinder carry cart 1 is moved. For example, when parking and keeping the brake applied (FIG. 5B), the brake pin 15 is inserted into a position where the thick shaft portion 15b of the brake pin 15 fits into the lower arc portion of the concave portion 14c of the second link. Is adjusted.

(2) Connection transmission part Next, the connection transmission part 30 of the brake operation in the expansion-contraction part of the outer pipe 3B upper end part of the support | pillar 3 among the brake mechanisms of the oxygen cart carry cart 1 of this embodiment is demonstrated.

  The connection transmission unit 30 adjusts the height of the handle 2 by changing the length of the entire support column 3 by sliding the inner pipe 3A in and out of the outer pipe 3B when the height of the handle 2 is adjusted. In addition, the positional relationship between the inner pipe 3A and the outer pipe 3B can be fixed, and the brake operation by the operation of the brake lever 11 of the operation unit 10 arranged at the upper end of the column 3 is arranged at the lower end of the column 3. For the first transmission member 31 on the operation unit 10 side and the second transmission member 32 on the wheel braking unit 50 side that transmits to the wheel braking unit 50, the first transmission member 31 and the second transmission member 32 when the height of the handle 2 is adjusted. The positional relationship between the first transmission member 31 and the second transmission member 32 is fixed and the first transmission member 31 is fixed from the operating portion 10 when the height of the handle 2 is fixed. A mechanism for making it possible to transmit the transmitted brake operation in the second transmission member 32.

  As shown in FIGS. 7 to 10, the connection transmission unit 30 for the brake operation in the oxygen cylinder carry cart 1 of the present embodiment includes an inner pipe 3 </ b> A and an outer pipe into which the inner pipe 3 </ b> A is slidably inserted. 3B, which can be expanded and contracted, an operation unit 10 disposed at the upper end of the column 3, a wheel braking unit 50 disposed at the lower end, an operation unit 10 and a wheel disposed inside the column 3 In the telescopic frame provided with a linkage mechanism that connects the brake unit 50 to enable linkage operation, the first transmission member 31 that is integrated with the operation unit 10 and interlocked therewith, and the first transmission member 31 that is integrated with the wheel brake unit 50 and interlocked therewith. Two transmission members 32, a connection pin 33 that penetrates the peripheral wall of the inner pipe 3A and the peripheral wall of the outer pipe 3B and connects them in the expansion and contraction direction of the support column 3, and the connection pin 33 protrudes from the inner pipe 3A. The swinging member 34 that is operated in the inserting direction, the biasing member 35 that constantly biases the swinging member 34 so as to push the connecting pin 33 toward the inner pipe 3A, and the connecting pin by swinging the swinging member 34. An operation button 39 for performing an operation of pulling out the distal end portion 33b of the 33 from the inner pipe 3A, and a swinging member 34 in which one end formed with an engaging portion 36c with the first transmission member 31 is always urged by the urging member 35. The second transmission member 36 is pressed against the first transmission member 31 via the connection pin 33 and the second transmission member 32 is connected to the other end side so as to be swingable, and the first transmission member 31 is moved up and down. A retainer member 37 that holds the second swinging member 36 so as to be able to swing back and forth while holding the second swinging member 36 in a slidable direction, and an engaging portion 36c of the second swinging member 36 that is attached to the retainer member 37 is formed. One end to the first And a second biasing member 38 which with the second oscillating member 36 constantly biases as away from the member 31.

  Then, by pushing the operation button 39 and swinging the swinging member 34, the distal end portion 33b of the connecting pin 33 is pulled out from the inner pipe 3A to extend and contract the column 3 (in other words, the sliding between the inner pipe 3A and the outer pipe 3B). At the same time as the locked state is released, the urging force that presses the engaging portion 36c of the second swinging member 36 against the first transmission member 31 is released, and the engaging portion 36c is forced by the force of the second urging member 38. Is separated from the first transmission member 31, and the connection between the first transmission member 31 and the second transmission member 32 is released.

  The support column 3 is formed by fitting two pipes in a nested manner, and a plurality of through holes are provided side by side in the axial direction, that is, in an expansion / contraction direction, and a through hole is provided in the peripheral wall of the outer pipe 3B. The degree of insertion of the inner pipe 3A with respect to the outer pipe 3B is adjusted, the height of the handle 2 attached to the upper end is adjusted, and it is fixed by screws or pins inserted across the through holes of both pipes 3A, 3B. Is.

  A plurality of through-holes 40, 40,... Are provided in the peripheral wall of the inner pipe 3A at regular intervals in the axial direction, and one through-hole 41 is provided at a position near the upper end of the outer pipe 3B. And the support | pillar 3 is arbitrarily set by inserting the front-end | tip part 33b of the connection pin 33 provided by penetrating the through-hole 41 of the outer side pipe 3B in any one of several through-holes 40, 40, ... The length can be fixed. In this embodiment, a plurality of through holes 40, 40,... Are formed in the rear peripheral wall of the inner pipe 3A, and a through hole 41 is formed in the rear peripheral wall of the outer pipe 3B.

  The first transmission member 31 whose upper end is connected to the second link 14 of the operation unit 10 is formed in an elongated plate shape, and is arranged in the vertical direction in the column 3 with both plate surfaces facing left and right. . The first transmission member 31 has a through hole 31a at its upper end and a plurality of recesses at the same interval as the interval between the plurality of through holes 40, 40,... Provided in the peripheral wall of the inner pipe 3A. 31b, 31b, ... are formed at the rear edge.

  On the other hand, the second transmission member 32 whose lower end is coupled to the arm mounting block 52 so as to be interlocked with the arm mounting block 52 of the wheel braking unit 50 includes a rod-shaped main body portion 32a that is bent in the front-rear direction and a plate-shaped upper end. It consists of the part 32b, and is arrange | positioned in the support | pillar 3 in the up-down direction. The first transmission member 31 and the second transmission member 32 are partially overlapped in the support column 3 when the handle is in the highest position, and are largely overlapped when the handle is in the lowest position.

  In this embodiment, the cover 42 is attached to the upper end portion of the outer peripheral surface of the rear peripheral wall of the outer pipe 3B, the swing member 34 is disposed in the cover 42, and the outer pipe 3B of the cover 42 is disposed. The operation button 39 is disposed through a surface facing the rear peripheral wall. In addition, the code | symbol 46 in a figure is a cover which covers the upper end of the outer side pipe 3B.

  The swing member 34 is attached to the cover 42 so as to be swingable back and forth by a swing shaft 45 (hereinafter referred to as an in-cover swing shaft) penetrating left and right through the through hole 34a in the upper and lower intermediate portion.

  The operation button 39 is arranged so as to be aligned with the position of the through hole 41 in the peripheral wall of the outer pipe 3B and to be operated in the front-rear direction. Further, the tip of the operation button 39 in the cover 42 is in contact with a portion near the upper end of the swing member 34, and when the operation button 39 is pushed in, an urging force is applied to push the upper portion of the swing member 34 toward the column 3 side. .

  In the present embodiment, a torsion spring is used as the biasing member 35. The torsion spring 35 is wound around the in-cover swing shaft 45. The torsion spring 35 is interposed between the surface of the cover 42 that faces the rear peripheral wall of the outer pipe 3B and the swinging member 34, and exerts a biasing force that pushes the lower portion of the swinging member 34 toward the column 3 side. Always applied to the swing member 34.

  The connecting pin 33 is swingably attached to the lower portion (the long hole 34b) of the swinging member 34 by a connecting pin rotating shaft 43 that passes through the through hole 33a in the left-right direction. The connecting pin 33 penetrates the through-hole 41 in the peripheral wall of the outer pipe 3B and the through-hole 40 in the peripheral wall of the inner pipe 3A when the swinging member 34 is pushed toward the support column 3 side. However, when it is separated from the column 3, it is pulled out from the through hole 40 in the peripheral wall of the inner pipe 3A, and only enters the through hole 41 in the peripheral wall of the outer pipe 3B.

  With the above-described configuration, when the operation button 39 is not operated, the lower portion of the swing member 34 is urged toward the support column 3 by the action of the torsion spring 35 and attached to the lower portion of the swing member 34. Since the connecting pin 33 is stabilized in a state where it passes through the peripheral wall of the outer pipe 3B and the peripheral wall of the inner pipe 3A, the state where both the pipes 3A and 3B are fixed is maintained.

  On the other hand, when the operation button 39 is operated and pushed in, the upper end of the swing member 34 is pushed toward the support column 3 by the tip of the operation button 39 in the cover 42, and the swing member 34 passes through the through hole 34a. The lower part of the connecting pin 33 attached to the lower part of the swinging member 34 is pulled out from the through hole 40 on the peripheral wall of the inner pipe 3A. Thus, the inner pipe 3A can slide with respect to the outer pipe 3B.

  In the second swing member 36, a front through hole 36a and a rear through hole 36b are formed at a lower end portion, and an engaging portion 36c with the first transmission member 31 is formed at a position near the upper end.

  The second rocking member 36 and the second transmission member 32 are connected by a pin 44 that penetrates the through hole 36b on the rear side of the lower end portion of the second rocking member 36 and the through hole 32c of the upper end portion 32b of the second transmission member 32. Connected.

  Further, in the present embodiment, a recess 31 b is formed in the rear edge portion of the first transmission member 31, and the engaging portion 36 c of the second swing member 36 is in the left-right direction that fits into the recess 31 b of the first transmission member 31. It is formed as an engagement shaft.

  Therefore, the first transmission member 31 and the second transmission member 32 are linked and the positional relationship is fixed when the engaging portion 36c of the second swinging member 36 is fitted in the recess 31b of the first transmission member 31. When the engaging portion 36c is disengaged from the recessed portion 31b, the positional relationship is released.

  The retainer member 37 is formed with a housing portion 37a at the rear end portion in a state of being disposed in the support column 3, and is provided with three through-pins in the left-right direction disposed in the vertical direction penetrating the housing portion 37a. 37d, 37c, 37b) from the top. Further, a slit 37e communicating with the housing portion 37a is formed in the upper wall of the housing portion 37a of the retainer member 37. In addition, the slit 37e is formed in the width | variety which clamps the 1st transmission member 31 so that sliding is possible.

  The second rocking member 36 is housed in the housing portion 37a of the retainer member 37, and can swing back and forth with respect to the retainer member 37 by passing the lower through pin 37b through the front through hole 36a in the lower end portion. Attached to.

  In the present embodiment, a torsion spring is used as the second urging member 38. The torsion spring 38 is wound around a through pin 37 c in the middle of the retainer member 37. The torsion spring 38 is interposed between the front wall of the accommodating portion 37a of the retainer member 37 and the second swinging member 36, and applies a biasing force that separates the upper portion of the second swinging member 36 from the support column 3. Always applied to the swing member 36.

  The first transmission member 31 is inserted into a slit 37e communicating with the accommodating portion 37a of the retainer member 37, and an upper penetrating pin 37d penetrating the accommodating portion 37a in the left-right direction and an engaging portion 36c of the second swinging member 36. Between the two.

  It is possible to adjust the entire length of the column 3, that is, the height of the handle 2 by the connection transmission unit 30 described above, and the first transmission member 31 and the second transmission in a state where the entire length of the column 3 is fixed. It is possible to fix the positional relationship with the member 32 and enable the linkage operation, and to operate the brake of the wheel braking unit 50 via the first transmission member 31 and the second transmission member 32 for the brake operation in the operation unit 10.

  Specifically, when the operation button 39 is not operated and no pushing force is applied, the operation button 39 is attached to the swing member 34 that swings back and forth around the swing shaft 45 in the cover that passes through the upper and lower intermediate portions. A biasing force that pushes the lower portion toward the support column 3 is always applied by the torsion spring 35 that is a biasing member, and the connecting pin 33 attached to the lower portion of the swing member 34 is always pressed toward the support column 3 side. Then, the connecting pin 33 passes through the through hole 41 in the peripheral wall of the outer pipe 3B and the through hole 40 in the peripheral wall of the inner pipe 3A and is stabilized in a state in which the relative positional relationship between both is fixed. That is, the connection transmission unit 30 maintains a state where the height of the handle 2 is locked.

  Further, the connecting pin 33 pushes forward the upper part of the second swinging member 36 attached to the retainer member 37 disposed in the column 3 so as to be swingable back and forth around the penetrating pin 37b penetrating the lower end portion. . Then, the engaging shaft 36c as the engaging portion on the upper part of the second swinging member 36 is fitted in the concave portion 31b of the first transmission member 31, and is stabilized in a state where the relative positional relationship between the members 36 and 31 is fixed. . That is, the connection transmission unit 30 is connected to the first transmission member 31 and the second transmission member 32 via the second swinging member 36 to fix the positional relationship and locked so that both the members 31 and 32 are interlocked. Hold. In order to ensure the engagement between the engagement shaft 36c of the second swing member 36 and the recess 31b of the first transmission member 31, the front end of the first transmission member 31 and the upper penetration of the retainer member accommodating portion 37a are penetrated. It is possible to prevent the first transmission member 31 from swinging forward due to contact with the pin 37d.

  On the other hand, while the operation button 39 is operated and a pushing force is applied, the upper part is pushed forward and the swing member 34 swings. Thereby, the tip portion 33b of the connecting pin 33 attached to the lower portion of the swing member 34 is pulled out from the through hole 40 in the peripheral wall of the inner pipe 3A. That is, the connection transmission part 30 cancels | releases fixation of the positional relationship of the inner side pipe 3A and the outer side pipe 3B, and enables adjustment of the length of the support | pillar 3 whole.

  Further, when the distal end portion 33b of the connecting pin 33 is pulled out from the inner pipe 3A, the force pushing the upper portion of the second swing member 36 forward is released. Then, the upper portion of the second swing member 36 is pulled away from the first transmission member 31 by the biasing force of the second biasing member 38. That is, the connection transmission unit 30 releases the fixed positional relationship between the first transmission member 31 and the second transmission member 32.

  According to the connection transmission unit 30 having the above configuration, the height of the handle 2 can be adjusted by fixing and releasing the positional relationship between the inner pipe 3A and the outer pipe 3B, and the inner pipe 3A. It is possible to transmit the brake operation transmitted to the first transmission member 31 via the operation unit 10 to the second transmission member 32 even when the positional relationship between the outer pipe 3B and the outer pipe 3B changes.

(3) Wheel braking part Next, the wheel braking part 50 by the side of the front wheel 4 among the brake mechanisms of the oxygen cylinder carry cart 1 of this embodiment is demonstrated. In addition, the 2nd transmission member 32 of the connection transmission part 30 is a brake wire for the wheel braking part 50, and the 2nd transmission member 32 is also called the brake wire 32 below.

  As shown in FIGS. 12 to 16, the wheel braking portion 50 of the brake mechanism in the oxygen cylinder carry cart 1 of the present embodiment includes a stopper block 51 housed in the lower end portion inside the outer pipe 3 </ b> B and the stopper block 51 below. The arm attachment block 52, the biasing member 53 interposed between the stopper block 51 and the arm attachment block 52, the brake arm 54 attached to the lower end surface of the arm attachment block 52, and the brake arm 54. And an adjustment screw 55 provided on the lower end side of the arm mounting block 52. A brake wire 32 through which a brake operation at the operation unit 10 is transmitted through the connection transmission unit 30 passes through the stopper block 51, the urging member 53, and the arm attachment block 52. 13 and 14, the illustration of the rear wheel 5 and the base plate 6 is omitted, and in FIGS. 15 and 16, the illustration of the rear wheel 5 and the portion of the base plate 6 on the rear wheel 5 side is omitted.

  And the brake structure of this invention applied to the wheel braking part 50 of the brake mechanism of this embodiment is attached to the lower end of the support | pillar 3 which has the brake operation part 10 containing the handle | steering-wheel 2 and the brake lever 11 in an upper end. A brake structure that applies braking to the wheel 4, and is provided inside the column 3, members 31, 32, etc., to which the brake operation at the brake operation unit 10 is transmitted, and members 31, 32 to which the brake operation is transmitted. The brake pad 54c attached to the brake arm 54 is pressed against the outer peripheral surface of the drum 8a of the wheel 8 of the wheel 4 so as to brake the wheel 4. I have to.

  In the brake structure of the present embodiment, the brake pad 54c is further attached to the upper surface of the brake arm 54, and the members 31, 32, etc. to which the brake operation is transmitted by the brake operation in the brake operation unit 10 are pulled up, thereby the brake arm 54 is pulled up so that the brake pad 54 c is pressed against the lower outer peripheral surface of the drum 8 a of the wheel 8.

  The stopper block 51 is fixed at a position near the lower end inside the outer pipe 3B. In the present embodiment, the stopper block 51 is fixed to the outer pipe 3B by a screw that penetrates the peripheral wall of the outer pipe 3B.

  Here, the brake wire 32 of the present embodiment is once bent from the position near the rear end in the outer pipe 3B to the front side of the axial center position, and further, at the position (height) of the stopper block 51, the brake pipe 32 of the outer pipe 3B. Bends to the axial center position (FIG. 14B). By bending in this way, when the grip 2b of the handle 2 and the brake lever 11 are strongly squeezed and an excessive force is applied to the brake wire 32, a part of the force is absorbed by the elasticity of the bent portion. Thus, the various members of the operation unit 10, the connection transmission unit 30, and the wheel braking unit 50 are prevented from being damaged or damaged.

  And since the stopper block 51 penetrates the brake wire 32 bent in the front-rear direction at the position of the stopper block 51, a through long hole 51a having the front-rear direction as the longitudinal direction of the opening is formed.

  The arm mounting block 52 is provided below the stopper block 51, and when the brake operation is not performed, a part of the lower end protrudes from the lower end opening of the outer pipe 3B. A recess is formed in each of the center of the upper end surface and the center of the lower end surface of the arm mounting block 52, and a through hole 52a that connects these two recesses is formed at the axial center position. The arm mounting block 52 is movable up and down with respect to the outer pipe 3B. Guide pins 52b are attached to the left and right side portions of the arm mounting block 52 in the left-right direction, and the peripheral walls of the left and right side portions of the outer pipe 3B are penetrated with the vertical direction at the position near the lower end. A long hole is formed. And the guide function which moves the arm attachment block 52 straight up and down is exhibited by engaging the guide pin 52b with the said penetration long hole.

  The urging member 53 is provided between the stopper block 51 and the arm mounting block 52, and the arm mounting block 52 is provided with the upper end facing the stopper block 51 fixedly mounted on the outer pipe 3B. Is urged downward. In the present embodiment, a compression coil spring is provided as the biasing member 53.

  In the present embodiment, a recess is formed in the center of the lower end surface of the stopper block 51, and the upper end portion of the compression coil spring 53 is fitted into the recess, and the compression coil spring 53 is inserted into the recess of the upper end surface of the arm mounting block 52 described above. A lower end portion is fitted, and a compression coil spring 53 as an urging member is disposed.

  The brake wire 32 penetrates the through-hole 51a of the stopper block 51, penetrates the hollow portion in the axial direction of the compression coil spring 53, further penetrates the through-hole 52a of the arm mounting block 52, and has a lower end. The portion protrudes into the recess in the lower end surface of the arm mounting block 52.

  And the brake arm with respect to the brake wire 32 in the connection part of the brake wire 32 and the brake arm 54 which is a member which transmits a brake operation to the lower end part of the brake wire 32 which protrudes in the recessed part of the arm attachment block 52 lower end surface An adjusting screw 55 as a mechanism for adjusting the position of 54 is fitted. Specifically, in the present embodiment, a male screw is formed at the lower end portion of the brake wire 32 and a female screw is formed in the hole at the axial center position of the adjusting screw 55 so that the adjusting screw 55 is fitted to the lower end portion of the brake wire 32. It is done. At this time, the head of the adjustment screw 55 is accommodated in the recess in the lower end surface of the arm mounting block 52, and only the shaft portion projects from the lower end surface of the arm mounting block 52.

  The adjustment screw 55 is fixed when the positional relationship between the inner pipe 3A and the outer pipe 3B is fixed and the positional relationship between the first transmission member 31 and the second transmission member 32 is fixed. This is for adjusting the distance between the outer peripheral surface of the wheel drum 8a and the surface of the brake pad 54c to be appropriate. Specifically, by turning the adjusting screw 55, the outer thread of the wheel drum 8a is adjusted by adjusting the degree of entry of the male screw at the lower end of the brake wire 32 into the hole at the axial center position of the adjusting screw 55. The distance from the surface of the brake pad 54c is adjusted.

  The brake arm 54 includes a plate-like main body 54a extending from the axial center position of the outer pipe 3B in the direction of the left and right front wheels 4 and 4, and pad mounting portions 54b protruding upward from the left and right ends of the main body 54a. The brake pad 54c is attached to the pad attachment portion 54b. In addition, illustration of the brake pad 54c is abbreviate | omitted in FIG.

  The brake arm 54 is attached to the lower end surface of the arm attachment block 52. In the present embodiment, the main body 54a is pressed against the lower end surface of the arm mounting block 52, and is fixed and attached by four bolts 54e.

  Here, in the brake structure of the present invention, the brake pad is pressed against the drum of the wheel instead of the ground contact surface of the wheel to apply the brake. In the present embodiment, the brake pad 54c is pressed against the lower outer peripheral surface of the drum 8a of the wheel 8 of the front wheel 4 to brake the front wheel 4.

  For this reason, the brake arm 54 is formed to have a dimension in the left-right direction in which the pad attachment portions 54b, 54b at the left and right ends are respectively positioned below the drums 8a, 8a of the left and right wheels 8, 8. When the positions of the arm mounting block 52 to which the brake arm 54 is mounted and the drum 8a of the wheel 8 are shifted in the front-rear direction, the pad mounting portion 54b is positioned approximately below the axial center position of the drum 8a. The dimensions of the brake arm 54 in the front-rear direction and the planar shape of the main body 54a are adjusted so that they can be performed.

  The pad attachment portions 54b and 54b are formed as convex portions facing upward in the front-rear direction at the left and right ends of the main body 54a of the brake arm, and a groove in the front-rear direction is formed on the upper surface of the convex portion. And the brake pad 54c is fixed and attached to the said groove | channel of the front-back direction.

  The brake pad 54c is for pressing the front wheel 4 by being pressed against the drum 8a of the wheel 8 and friction with the drum 8a. In the present invention, the material of the brake pad 54c is not limited to a specific material as long as it exhibits a frictional force when pressed against the drum 8a. Specifically, for example, a resin pad is used.

  Further, when the left and right pad mounting portions 54b, 54b are positioned below the drum 8a and are mounted on the lower end surface of the arm mounting block 52, the brake arm 54 is caused to pass through the shaft portion of the adjusting screw 55. For this purpose, a through hole 54d is formed.

  With the above configuration, when the brake wire 32 is pulled up by a brake operation, an upward force is applied to the arm mounting block 52 via the adjustment screw 55, and the brake arm 54 moves upward together with the arm mounting block 52. Then, the brake pads 54c at the left and right ends of the brake arm 54 are pressed against the drum 8a of the wheel to brake the front wheel 4.

  On the other hand, when the brake operation is not performed, a downward force is applied to the brake arm 54 by the urging force applied to the arm mounting block 52 by the urging member 53 and the weight of the arm mounting block 52, the brake arm 54, and the like. The brake pad 54c is stabilized at a position below the drum 8 of the wheel, so that the front wheel 4 can be freely rotated.

  According to the brake structure of the present invention configured as described above, the brake pad 54c is pressed against the wheel drum 8a of the wheel 4 so that the wheel 4 is braked. Thus, it is possible to avoid wear of the wheel 4 and to shorten the life of the wheel 4 and to reliably brake the wheel 4 to improve safety. In addition, since the brake arm 54 and the brake pad 54c can be disposed inside the wheel 8 of the wheel 4, the appearance can be improved.

  In addition, although the above-mentioned form is an example of the suitable form of this invention, it is not limited to this, A various deformation | transformation implementation is possible in the range which does not deviate from the summary of this invention. For example, in the present embodiment, the brake pad 54c is pressed against the lower outer peripheral surface of the wheel drum 8a. However, the position where the brake pad 54c is pressed is not limited to this, and the outer periphery of the wheel drum 8a is not limited thereto. It can be anywhere on the surface. Specifically, for example, the brake pad 54c is attached to the lower surface of the brake arm 54 and the first transmission member 31 and the second transmission member 32 are pushed down by the brake operation at the operation unit 10, and the brake arm 54 is moved by the brake operation. The brake pad 54c may be pressed down and pressed against the upper outer peripheral surface of the wheel drum 8a.

  Moreover, the structure gathered in the connection transmission part 30 is not limited to the thing in this embodiment. That is, as long as the inner pipe that constitutes the column is fixed by changing the connection location of the first transmission member and the second transmission member in accordance with the change in the length of the entire column due to the insertion and removal of the outer pipe Any thing is good.

DESCRIPTION OF SYMBOLS 1 Carry cart for oxygen cylinders 2 Handle 3 Strut 4 Wheel 8 Wheel 8a Drum 10 Brake operation part 11 Brake lever 31 First transmission member 32 Second transmission member 54 Brake arm 54c Brake pad

Claims (6)

  A brake structure that brakes a wheel attached to a lower end of a support column having a brake operation unit including a handle and a brake lever at an upper end, and is provided inside the support column so that the brake operation in the brake operation unit is performed And a brake arm that operates in conjunction with the member to which the brake operation is transmitted, and a brake pad attached to the brake arm is pressed against the outer peripheral surface of the drum of the wheel of the wheel. And braking the wheel.   The brake pad is attached to the upper surface of the brake arm, and the brake arm is pulled up by pulling up a member to which the brake operation is transmitted by the brake operation in the brake operation unit, and the brake pad is moved to the drum of the wheel. The brake structure according to claim 1, wherein the brake structure is pressed against a lower outer peripheral surface of the brake.   The brake structure according to claim 1, wherein the brake pad is made of resin.   The brake structure according to claim 1, further comprising a mechanism for adjusting a position of the brake arm with respect to a member to which the brake operation is transmitted to a connecting portion between the member to which the brake operation is transmitted and the brake arm. .   The strut includes an inner pipe and an outer pipe into which the inner pipe is slidably inserted, and a member to which the brake operation is transmitted is a first transmission member on the brake operation unit side and a first member on the wheel side. A second transmission member, and the connection position of the first transmission member and the second transmission member is changed in accordance with a change in the overall length of the support column when the inner pipe is inserted into and removed from the outer pipe. By being fixed, the brake operation at the brake operation portion is transmitted to the brake arm via the first transmission member and the second transmission member even when the length of the column changes. The brake structure according to claim 1.   A carry cart incorporating the brake structure according to claim 1.

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