JP4459799B2 - Towing conveyor - Google Patents

Description

  The present invention relates to a traction conveyance device, and more particularly, to a manual conveyance device driven by traction such as a hand cart or a carry case.

  2. Description of the Related Art Conventionally, as a traction conveyance device provided with a pulling rod that is formed to be telescopically connected by connecting a plurality of pipe bodies in a telescope shape, those described in Patent Document 1 and Patent Document 2 are known. In these conventional examples, the towing and transporting device is a cart, and the pulling rod is formed by connecting the upper ends of a pair of struts with a handle, and each strut has a proximal end pipe, an intermediate pipe, and a distal end having different diameters. By forming the pipes in a telescopic manner, the pipe on the inner peripheral side is accommodated inside the pipe on the outer peripheral side, or is extended and retracted by drawing it out of the pipe on the outer peripheral side.

  Further, in order to maintain the length of the pulling rod when the cart is used, a locking means is provided at the lower end of each of the leading pipe and the intermediate pipe, and each of the intermediate pipe and the proximal pipe is provided. A hole is provided in the upper end. The locking means includes a metal ball that is movable in the radial direction of the pipe, and a pin-like advance / retreat member that includes a large diameter portion and a small diameter portion and is movable in the longitudinal direction of the pipe. By pushing the metal ball into the hole by the portion, the relative movement of the tip pipe and the intermediate pipe, the intermediate pipe and the base pipe is restricted, and the pulling rod is maintained in the extended posture. In addition, the advancing / retracting member is urged to a position where the large-diameter portion is opposed to the metal ball by the spring, so that the metal ball is elastically locked in the hole as it is extended, and the pulling lever is in the extended posture with one touch. Retained.

Further, in order to allow the pulling rod to be retracted by remote operation, a wire is inserted into the hollow portion inside the tip pipe, and an operating body is provided above the pulling rod. One end of the wire is connected to the operating body, the other end is connected to the advancing / retracting member of the locking means provided on the tip pipe, and when the operating body is operated, the advancing / retreating member pushes the metal ball into the hole by the large diameter portion Is moved upward, and the small-diameter portion is opposed to the metal ball. Therefore, if the pulling rod is pushed down from above in this state, the metal ball can be retracted from the hole and the tip pipe can be accommodated inside the intermediate pipe. By pressing the advancing / retracting member and moving it downward, the contact point of the advancing / retreating member of the intermediate pipe with the metal ball changes from the large diameter portion to the small diameter portion, so that the intermediate pipe can move into the proximal pipe.
JP-A-8-53068 JP-A-8-244617

  However, in the above-described first and second conventional examples, the length of the pulling rod that can be maintained by the locking means is only one aspect of the above-mentioned extended posture, so that the cart is pulled depending on the height of the cart user. It may be difficult.

  The present invention has been made to solve the above drawbacks, and an object of the present invention is to provide a traction transportation device that is easy to use.

According to the present invention, the object is
A pulling rod 2 that is formed to be telescopically formed by connecting the pipe body 1 in a telescope shape having three or more stages,
A lock body 3 which is fixed to the pipe body 1 and accommodated in the pull rod 2 and elastically locks the adjacent pipe bodies 1 and 1 so as not to move relative to each other, and holds the pull rod 2 in a non-degenerate state. A plurality of
The lock body 3 includes a small diameter portion 23a and a large diameter portion 23b, and a lock ball 25 is formed to be movable in the radial direction of the pipe body 1 by a slider 23 that is movable in the longitudinal direction of the pipe body 1. The lock formed on the upper end portion of each pipe body 1 (1B, 1C) fixed to the lower end portion of each pipe body 1 (1A, 1B) arranged on the upper stage side in the extended posture 2 The lock ball 25 is engaged with the hole 21 to hold the adjacent pipe body 1, 1 (1A, 1B, or 1B, 1C) in a non-degenerate manner, and the slider 23 is compressed by a large diameter portion 23b by a compression spring 28. The lock ball 25 is urged to a position where the lock ball 25 is pushed into the lock hole 21,
The slider 23 of the lock body 3 ′ at the uppermost position is connected to an operation lever 19 formed on the pulling rod 2 via a linear body 26, and the slider 23 is moved by the operation of the operation lever 19 to move the lock ball 25. The slider 23 of the lock body 3 ″ positioned below the lock body 3 ′ is brought into contact with the small diameter portion 23a by releasing the lock body 3 ′ at the uppermost position and retracting the pulling rod 2 from above. The lock spring 25 can be pushed down so as to match the small diameter portion 23a against the compression spring 28 and can be unlocked, and the pull rod 2 can be shifted to a retracted posture .
And, adjusting the locking holes 29, 29 ... on the lower side of the pipe body 1B adjacent Oite the uppermost portion is formed, engaging the locking ball 25 of the locking member 3 uppermost position 'to adjust the lock hole 29 By being stopped , the pipe bodies 1A and 1B adjacent to each other at the uppermost step portion are formed to be constrained at a plurality of relative positions within the non-engagement release operation range of the lock body 3 ″ located below the lock body 3 ′. This is achieved by providing a traction and conveying device in which the length of the pulling rod 2 can be adjusted.

  According to the present invention, the towing and transporting device is fixed to the pipe body 1A located at the innermost peripheral side and positioned at the uppermost stage of the pulling rod 2 by the lock body 3 'at the uppermost position, The uppermost pipe body 1A and the outer circumference of the pipe body 1 are accommodated in the hollow portion of 1A or the adjacent second-stage pipe body 1B and positioned at the uppermost stage in the extended pulling lever 2 By constraining the second-stage pipe body 1B adjacent to the side at a plurality of relative positions, the overall length of the pulling rod 2 can be adjusted. In order to adjust the length of the pull rod 2, it is necessary to unlock the lock body 3 that is elastically locked as it extends, but when the pull rod 2 is retracted, the lock body 3 is appropriately unlocked. By using the upper lock body 3 ′, it is possible to adjust the length of the pulling lever 2 only by performing the same operation as in the degeneracy, which makes it easy to use. Further, since there is no need to make any special modification or change to the above-described conventional example except for the restraint of the pipe bodies 1A, 1B adjacent to the uppermost part by the uppermost locking body 3 ′, the conventional example By using this structure, it is possible to easily adjust the length of the pulling rod 2 without changing the operation at the time of extending / retracting the pulling rod 2.

The length adjustment of the pulling rod 2 by the lock body 3 ′ at the uppermost position is performed by, for example, providing a plurality of holes along the longitudinal direction in the second-stage pipe body 1B and locking the lock body 3 ′. It is possible to perform the operation so that the hole can be selected, and if the operation unit that can be remotely operated is provided on the upper part of the pulling rod 2 as in the conventional example, the lock body 3 ′ can be unlocked by an easy operation, or It is possible to prevent the holes that are not desired to be locked from being loosely locked. Further, the length of the second-stage pipe body 1B substantially matches the length in the retracted posture of the pulling rod 2 that is appropriately determined in consideration of the portability of the cart. It is possible to set a specific length range suitable for .

  Therefore, according to the present invention, the pulling lever 2 can be made compact when retracted by the telescope structure, and the portability is enhanced, and the portability is not impaired by the lock body 3 housed inside the pulling rod 2. The length during use can be adjusted, and usability can be improved.

  In the above, the case where the length of the pulling rod 2 can be adjusted, that is, the length of the pulling rod 2 as a use state can be adjusted to improve the usability of the towing and transportation device. Usability of the towing and transporting device can be improved by further improving the portability of the pulling rod 2 to be formed when not in use. That is, the above-described conventional example has a drawback in that it needs to be taken with care because the pulling rod 2 cannot be held in the retracted posture.

The present invention has been made to eliminate such drawbacks, and aims to provide a cart that is easy to use by improving portability.
A pull rod 2 Shin be reduced freely formed by connecting the pipe 1 to the telescopic to a three or more stages,
A lock body 3 which is fixed to the pipe body 1 and accommodated in the pull rod 2 and elastically locks the adjacent pipe bodies 1 and 1 so as not to move relative to each other, and holds the pull rod 2 in a non-degenerate state. A plurality of
The lock body 3 includes a small diameter portion 23a and a large diameter portion 23b, and a lock ball 25 is formed to be movable in the radial direction of the pipe body 1 by a slider 23 that is movable in the longitudinal direction of the pipe body 1. The lock formed on the upper end portion of each pipe body 1 (1B, 1C) fixed to the lower end portion of each pipe body 1 (1A, 1B) arranged on the upper stage side in the extended posture 2 The lock ball 25 is engaged with the hole 21 to hold the adjacent pipe body 1, 1 (1A, 1B, or 1B, 1C) in a non-degenerate manner, and the slider 23 is compressed by a large diameter portion 23b by a compression spring 28. The lock ball 25 is urged to a position where the lock ball 25 is pushed into the lock hole 21,
The slider 23 of the lock body 3 ′ at the uppermost position is connected to an operation lever 19 formed on the pulling rod 2 via a linear body 26, and the slider 23 is moved by the operation of the operation lever 19 to move the lock ball 25. The slider 23 of the lock body 3 ″ positioned below the lock body 3 ′ is brought into contact with the small diameter portion 23a by releasing the lock body 3 ′ at the uppermost position and retracting the pulling rod 2 from above. The lock spring 25 can be pushed down so as to match the small diameter portion 23a against the compression spring 28 and can be unlocked, and the pull rod 2 can be shifted to a retracted posture.
The lower pipe body 1B adjacent to the uppermost stage part is formed with a lock hole 21 at the lower end part, and the remaining pipe bodies 1 (1C) arranged on the lower stage side in the extended posture of the pulling rod 2 A second lock hole 21 ′ is formed at the lower end of each of the lock bodies 3 ″ below the uppermost position so that the slider 23 has the small-diameter portion 23 a and the large-diameter portion 23 b opposite to the top and bottom. The second small-diameter portion 23a ′ and the second large-diameter portion 23b ′ are provided, and the second lock ball 25 ′ is opposed to the compression spring 28 by the second large-diameter portion 23b ′. engaged with the lock hole 21 'is intended to provide a 牽 pull conveyor that holds the pull rod 2 to degenerate position.

  According to the present invention, the pulling rod 2 which is telescopically formed and can be extended and contracted and has excellent portability can be held in the contracted posture by the locking means 4. Accordingly, since it is possible to prevent the pulling rod 2 from being unreasonably stretched, the traction conveyance device can be carried by holding a handle formed on the upper portion of the pulling rod 2, for example, and the portability can be further improved. .

The lock means 4 is sufficient if it can hold the pulling rod 2 in a retracted posture, and can be configured by screwing, for example. However, as in the conventional example described above, the locking means and the hole are used. If it is, the operability can be improved .

  On the other hand, if the pulling rod 2 can be held in the extended posture, it is possible to stabilize the transportation of the load. In this case, the pulling rod 2 is held in the contracted / extended posture by the same locking means 4. For example, the structure of the pulling rod 2 can be simplified, and the manufacturing cost and the like of the traction conveyance device can be reduced. Further, when the lock means 4 is housed inside the pulling rod 2, that is, in the hollow portion of the pipe body 1, the appearance becomes smart and the portability can be further improved.

  On the other hand, in the case where the pipe body 1 is configured to be connected in three or more stages, the intermediate pipe and the proximal pipe are provided by the locking body 3 ″ positioned below the uppermost position, that is, the locking means of the intermediate pipe in the conventional example. In addition, it is necessary to be able to hold the adjacent pipes in a contracted state, and to release the locking means when the pulling lever 2 is extended, so that it is positioned below the uppermost position. The lock body 3 ″ may be configured so that it can be individually locked and unlocked. For example, as will be described in detail in an embodiment described later, the lock body 3 ′ is moved to the uppermost portion by the lock body 3 ′ at the uppermost position. When the adjacent pipe bodies 1A, 1B are held in the contracted state, the lock body 3 "below the uppermost position holds the adjacent pipe bodies 1, 1 in the contracted state against the biasing force. By configuring so, it is possible to further improve the operability.

  As can be seen from the above description, according to the present invention, it is possible to provide an easy-to-use traction / transport device by adjusting the length of the pulling rod.

  In addition, since the pulling rod can be held in the contracted posture, it is possible to provide a traction transport device that is easy to use.

  FIG. 1 shows an embodiment of the present invention. In this embodiment, the towing and transporting device is a hand cart, and is connected to a pull rod 2 formed by connecting upper ends of a pair of support columns 10 and 10 with a handle 11, and a lower end portion of the pull rod 2. It has a loading platform 12 and wheels 13.

  As shown in FIGS. 1 and 2, the column 10 has a pipe (pipe body 1) made of three metals, that is, an upper pipe 1A, a middle pipe 1B, and a lower pipe 1C. The outer diameter of the upper pipe 1A is as follows. The middle pipe 1B is slightly smaller than the inner diameter of the middle pipe 1B, and the outer diameter of the middle pipe 1B is slightly smaller than the inner diameter of the lower pipe 1C, so that the middle pipe 1B is located on the outer circumference side of the upper pipe 1A, and the outer circumference side of the middle pipe 1B. The lower pipe 1C is arranged in a telescopic shape having three stages from the retracted position shown in FIG. 5 to the extended position shown in FIGS. Further, the relative movement range in the extending direction between the inner and outer pipes 1 and 1 when the upper pipe 1A and the middle pipe 1B are used as the inner pipe 1 and the middle pipe 1B and the lower pipe 1C is used as the outer pipe 1 is shown. In order to regulate, a cap 14 is fixed to the lower end of the upper pipe 1A or the like that forms the inner peripheral side, and a stopper portion 15 is formed at the upper end of the middle pipe 1B or the like that forms the outer peripheral side.

  As shown in FIG. 2 and the like, the cap 14 has a stepped columnar shape having a large-diameter overhanging portion 14b projecting outside the pipe 1 below the thin-diameter insertion portion 14a inserted into the hollow portion of the pipe 1. And is fixed by fitting the insertion portion 14a to the lower end of the upper pipe 1A or the like and caulking the lower end of the pipe 1A or the like as appropriate. The overhanging portion 14b has an outer diameter that is larger than the outer diameter of the pipe 1 on the inner peripheral side to be mounted and smaller than the inner diameter of the pipe 1 on the outer peripheral side. A protruding step is formed. Further, the stopper portion 15 has the inner end of the pipe 1 on the outer peripheral side inward so as to have an inner diameter that is larger than the outer diameter of the pipe 1 on the inner peripheral side and smaller than the outer diameter of the overhanging portion 14b. It is formed by protruding. As shown in FIG. 2 and the like, the stopper portion 15 is fixed to the upper end portion of the lower pipe 1C by integrally forming a step portion protruding in the inner diameter direction of the pipe 1 at the upper end portion in the intermediate pipe 1B. It is formed by the reinforcing member 16. The reinforcing member 16 functions to maintain the distance between the columns 10 and 10 at the positions by connecting the columns 10 and 10 to each other at the upper ends of the lower pipes 1C and 1C, and is formed of a synthetic resin material. Then, it is fixed to the upper end portion of the lower pipe 1C of each support column 10 with screws or the like (not shown).

  Therefore, the support column 10 can be extended until the cap 14 comes into contact with the stopper portion 15, and is in a maximum extended state at the time of contact. As for the contraction direction of the support column 10, the lower end of the lower pipe 1C is closed by the end cap 15 fitted around the lower pipe 1C, so that the lower pipe 1C is prohibited from moving downward from the lower pipe 1C. The movement range is restricted.

  As shown in FIG. 2 and the like, the handle 11 is formed in a hollow shape with connecting openings 18a into which the upper end portions of the upper pipe 1A are fitted at both ends, and restrains the interval between the upper end portions of both the columns 10 and 10. A case body 18 is provided. The case body 18 is formed by screwing an upper case piece and a lower case piece (not shown) formed by injection molding a synthetic resin material, and the case body 18 is provided with a boss 18b for such screwing. The case body 18 is curved so that the lower side of the case body 18 is swollen as a whole about the center in the longitudinal direction in the connected state to the support column 10 so as to be easily gripped when towing the hand cart. Is opened with an operation opening 18c that allows access to an operation lever 19 to be described later.

  As shown in FIG. 1, the loading platform 12 is a frame-like member that is substantially the same as the conventional example described above, and a main frame 12 a formed by bending a metal pipe into a U-shape, and a main frame 12 a It has the auxiliary | assistant frame 12b and the leg piece 12c connected so that vertical rotation is possible. The main frame 12a is supported at the free end side by the rod-shaped rotary shaft 20 that penetrates the end cap 15 described above, and can rotate vertically with respect to the pulling rod 2 and is in a horizontal position that is substantially perpendicular to the pulling rod 2. And a vertical posture along the pulling rod 2 can be rotated. The auxiliary frame 12b and the leg piece 12c are formed in a crankshaft shape by bending the central portion of the rod-shaped metal wire into a substantially convex shape, and both ends are connected to the main frame 12a. The auxiliary frame 12b expands the load receiving portion of the main frame 12a by rotation, and the plan view changes into a storage posture in which the convex portion is stored inside the main frame 12a and an extended posture protruding from the main frame 12a. To do. Further, the leg piece 12c supports the load receiving portion of the loading platform 12 together with the wheels 13, and when the main frame 12a takes a horizontal posture, the convex portion takes a support posture in which the main frame 12a protrudes downward from the main frame 12a. In the vertical posture of the frame 12a, the convex portion takes the storage posture along the main frame 12a.

  The wheel 13 is substantially the same as the conventional example, and is formed by attaching rubber tires 13b to both ends of an axle 13a rotatably supported by the end cap 15 described above, and is formed on a single axle connecting two rubber tires 13b. . The rubber tires 13b are arranged on both sides of the pulling rod 2 so as to sandwich the pair of support columns 10 and 10 from the outside, and avoid the contact between the load placed on the main frame 12a and the rubber tire 13b, and stably transport the load. In order to facilitate this, a main frame 12a that takes a horizontal posture from the main frame 12a to the upper side of the rubber tire 13b and a tire cover frame 12d that is bent in an L shape so as to extend along the column 10 are extended.

  Therefore, when a load is placed on the main frame 12a or the auxiliary frame 12b which is supported by the rubber tires 13b and 13b and the leg pieces 12c and takes a horizontal posture and the pulling lever 2 is tilted, the back of the pulling rod 2 and the tire cover frames 12d and 12d The luggage is supported at two points by the two rubber tires 13b, 13d so that the luggage can be easily transported by the wheels 13 by pulling the pulling rod 2 in this state. Further, when the luggage is not transported, the hand cart can be folded to approximately the same size as the loading platform 12 by retracting the pulling lever 2 and bringing the main frame 12a into a vertical posture. Further, since the end cap 15 is provided with a support piece 15a that protrudes downward to the same height as the bottom surface of the rubber tire 13b, the handpiece is supported by four-point support of the rubber tires 13b and 13b and the support pieces 15a and 15a in the folded state. A cart can be made self-supporting, and a storage property is improved more. Since the support piece 15a is arranged at an eccentric position on the loading platform 12 side with respect to the axle 13a in plan view, it does not come into contact with the ground or the like when towing the hand cart.

  Further, in this embodiment, in order to be able to hold the pulling rod 2 described above in the extended posture or the retracted posture, the lock means 4 is accommodated in the support column 10, and the handle 11 can be operated to release the lock means 4. The above-described operation lever 19 is provided. The lock means 4 includes a lock body 3 attached to the lower ends of the upper pipe 1A and the middle pipe 1B by the cap 14, and a lock hole 21 drilled in the middle pipe 1B and the lower pipe 1C forming the outer pipe 1. The lock body 3 is engaged with the lock hole 21 to restrict relative movement between the inner and outer pipes 1 and 1 so that the pulling rod 2 is held in the extended / retracted posture.

  As shown in FIG. 2 and the like, the lock body 3 includes a slider 23 inserted into a slider guide hole 22 provided in the cap 14, and a lock ball 25 held in the lock ball guide hole 24. The slider guide hole 22 is formed along the longitudinal direction of the pipe 1, and the lock ball guide hole 24 is formed so as to extend from the slider guide hole 22 to the outer periphery of the pipe 1 in the radial direction of the pipe 1.

  The slider 23 is a stepped pin made of a synthetic resin material having a small diameter portion 23a and a large diameter portion 23b. The slider 23 is inserted into the stepped slider guide hole 22 and can move in the longitudinal direction of the pulling lever 2. Either the small diameter portion 23a or the large diameter portion 23b faces the lock ball guide hole 24 communicating with the slider guide hole 22. On the other hand, the lock sphere 25 is a metal spherical body having a diameter slightly larger than the length of the lock sphere guide hole 24, and is inserted into the lock sphere guide hole 24 so as to be movable in the radial direction of the pipe 1. When the slider 23 faces the lock ball guide hole 24 with the large diameter portion 23b, a part thereof is pushed out from the lock ball guide hole 24, and when the slider 23 faces the small diameter portion, the lock ball guide hole 24 and the slider guide It is accommodated in the hole 22. Therefore, by moving the slider 23 in the longitudinal direction of the pipe, that is, upward or downward, the lock ball 25 can be accommodated in the cap 14 or protrude outward from the cap 14, and formed on the pipe 1 on the outer peripheral side. The lock ball 25 can be engaged with and disengaged from the lock hole 21. As shown in FIG. 2 and the like, the slider 23 is provided with a pin 27 for the lock body 3 ″ attached to the middle pipe 1B by the linear body 26 described later in the lock body 3 ′ attached to the upper pipe 1A. This prevents the slider guide hole 22 from coming off.

  On the other hand, the lock hole 21 has a slightly smaller diameter than the lock ball 25 and is formed at the upper and lower ends of the outer pipe 1 so that the pulling rod 2 can be held in an extended / retracted posture by the protrusion of the lock ball 25. . That is, when the lower end portion of the upper stage pipe 1A or the like to which the lock body 3 having the lock ball 25 is fixed and the upper end part of the middle stage pipe 1B or the like in which the lock hole 21 is drilled are locked, the extension posture of the pull rod 2 is increased. The lower end of each of the upper pipe 1A and the middle pipe 1B is locked, and the retracted posture of the pull rod 2 is maintained.

  Further, the slider 23 is urged by the compression spring 28 and formed with an inclined surface 23c so that the pulling rod 2 can be held in the expansion / contraction posture with one touch in accordance with expansion / contraction. As shown in FIG. 2 and the like, the compression spring 28 urges the slider 23 in a direction in which both ends are held by the slider 23 and the cap 14 and the lock ball 25 faces the large-diameter portion 23b. On the other hand, the inclined surface 23c moves the slider 23 against the urging force of the compression spring 23 so that the narrow diameter portion 23a of the slider 23 faces the lock ball 25 when the lock ball 25 cannot enter the lock hole 21. From the small diameter portion 23a, a component force is generated or a component force is generated to push the lock ball 25 out of the pipe body 1 by the biasing force of the compression spring 28 when the lock ball 25 faces the lock hole 21. It is formed so that the diameter gradually increases toward the large diameter portion 23b. Therefore, when the lock hole 21 does not face the lock ball guide hole 24, the slider 50 resists the urging force of the compression spring 28 so that the lock ball 25 whose movement is restricted by the pipe 1 on the outer peripheral side faces the small diameter portion 23 a. 23, and the lock ball 25 is pushed out of the cap 14 by the inclined surface 23c along with the opposing surface, so that the lock body 3 can be elastically locked to the lock hole 21 as the pulling rod 2 extends.

  On the other hand, in order to release the lock ball 25 from the lock hole 21, the handle 11 is formed by accommodating the operation lever 19 described above inside the case body 18. As shown in FIG. 2 and the like, the operation lever 19 includes a button portion 19a exposed to the outside of the case body 18 through the operation opening 18c described above, and a connection opening 18a of the case body 18 from both ends of the button portion 19a. The arm portion 19b is provided with a pair of arm portions 19b and 19b, and the arm portion 19b has a guide opening 19c through which the boss 18b described above is opened. Connect slidably in the vertical direction. Note that a lower portion of the button portion 19 a, that is, a portion exposed from the case body 18 is formed in a curved surface so as to be continuous with the case body 18.

  Further, in order to unlock the lock ball 25 by operating the operation lever 19, a linear body 26 is accommodated in the hollow portion inside the upper pipe 1A. The linear body 26 is connected to the slider 23 attached at one end to the arm 19b and at the other end to the upper pipe 1A to transmit the operating force to the operating lever 19 to the slider 23 of the upper pipe 1A. By moving up and down, the lock ball 25 is moved from the state facing the large diameter part 23 b to the state facing the small diameter part 23 a, that is, the lock ball 25 is retracted from the lock hole 21.

  In this embodiment provided with the locking means 4 and the operation lever 19 as described above, as shown in FIGS. 2 and 3A, the operation lever 19 is pushed by pushing the button portion 19a upward so as to grasp the handle 11. The slider 23 'of the lock body (the lock body 3' at the uppermost position) of the upper pipe 1A is urged downward by the compression spring 28, and the linear body 26 is pushed by pushing the button portion 19a. The lock ball 25 is formed so as to face the small-diameter portion 23a by moving upward by the upward movement. Therefore, if the lock body 3 ′ of the upper pipe 1 A is released by operating the operation lever 19, the lock ball 25 is pressed by the peripheral edge of the lock hole 21 by pushing down the pulling rod 2 from the upper side as it is. 14, the upper pipe 1A can be accommodated in a hollow portion inside the middle pipe 1B.

  On the other hand, the lock body (the lock body 3 ″ positioned below the uppermost lock body 3 ′) attached to the middle pipe 1B can be unlocked by being lowered with respect to the middle pipe 1B of the upper pipe 1A. 23 ″ is urged upward and is pushed down by the cap 14 of the upper pipe 1A, so that the lock ball 25 is formed so as to face the small diameter portion 23a. Therefore, as shown in FIG. 3B, the lock body 3 ″ of the middle pipe 1B is released when the upper pipe 1A is completely accommodated. This time, the middle pipe 1B can be accommodated inside the lower pipe 1C.

  Further, in the case where the pulling rod 2 is retracted in this way, if the operation of the operation lever 19 is released, the lock body 3 'of the upper pipe 1A is now elastically inserted into the lock hole 21 at the lower end of the middle pipe 1B. As a result, the upper pipe 1A and the middle pipe 1B are maintained in the degenerated state. On the other hand, at this time, the lower pipe 1B is regulated by the end cap 15 so that the lower pipe 1B is in a contracted state with the lower pipe 1C, and the lock body 3 ″ of the middle pipe 1B includes the cap 14 and the end cap 15 of the upper pipe 1A. The slider 23 ″ is pushed down so that the lock ball 25 faces the small diameter portion 23a as described above. For this reason, in order to maintain the contracted state of the intermediate pipe 1B and the lower pipe 1C in such a depressed state, the locking means 4 has a second small diameter portion 23a on the slider 23 ″ of the lock body 3 ″ of the intermediate pipe 1B. ', The second large diameter portion 23b' and the second inclined surface 23c ', the lock body 3 "is provided with a second lock ball 25', and the middle pipe 1B has a second lock ball. A guide hole 24 ′ is provided, and a second lock hole 21 ′ that engages with the second lock ball 25 ′ is provided in the lower pipe 1 </ b> C.

  The second large diameter portion 23b ', the second small diameter portion 23a', the second inclined surface 23c ', the second lock ball 25', the second lock ball guide hole 24 ', and the second lock As shown in FIGS. 5 and 6, the hole 21 ′ has a slider 23 ″ so as not to interfere with the aforementioned large diameter portion 23 b, small diameter portion 23 a, lock ball 25, lock ball guide hole 24, and lock hole 21. The second large-diameter portion 23b 'and the second small-diameter portion 23a' are formed upside down, so that the lock of the intermediate pipe 1B as described above. When the body 3 ″ is pushed down, the second large-diameter portion 23b ′ faces the second lock ball 25 ′, and the second lock ball 25 ′ engages with the second lock hole 21 ′, so that the middle pipe The relative movement of 1B and lower pipe 1C is restricted, and middle pipe 1B and lower pipe 1C is restrained degeneratively. To release the restraint, the lock body 3 'of the upper pipe 1A is unlocked by the operating lever 19 and the pulling rod 2 is extended upward, and the lock body 3 "of the middle pipe 1B is compressed by raising the cap 14 of the upper pipe 1A. And the slider 23 ″ is moved upward by the elastic return force of the spring 28, whereby the second small diameter portion 23a ′ is opposed to the second lock ball 25 ′. Two lock balls 25 ′ are accommodated in the cap 14. Since the second large-diameter portion 23b ′ and the second small-diameter portion 23a ′ are formed via the inclined surface 23c as described above, the second lock ball 25 ′ is formed along with the extension of the pulling rod 2. The slider 23 "moves smoothly so that the second small diameter portion 23a faces each other, or the second lock ball 25 'smoothly engages with the second lock hole 21' as the pulling rod 2 retracts. To do.

  In addition, in this embodiment, the cart has a plurality of adjustments having substantially the same dimensions as the lock holes 21 between the lock holes 21, 21 at the upper and lower ends of the intermediate pipe 1B so that the overall length can be adjusted. Provided with lock holes 29, 29,. The adjustment lock hole 29 is provided between the middle pipe 1B and the upper pipe 1A by engaging the lock body 3 'of the upper pipe 1A in the middle of the lock holes 21 and 21 for holding the pull rod 2 in the extended state and the retracted state. The pull-out amount is adjusted so that the overall length of the pull rod 2 can be adjusted. As shown in FIG. 4, a plurality of the pull-up rods 2 are provided at equal pitches in the longitudinal direction of the intermediate pipe 1B. For this reason, by engaging the lock body 3 ′ of the upper pipe 1 </ b> A with the arbitrary adjustment lock hole 29, the overall length of the pulling rod 2 can be adjusted using the length of the middle pipe 1 </ b> B.

  Accordingly, as shown in FIG. 5, in the above-described cart, in the retracted position, the lock body 3 ′ at the lower end of the upper pipe 1A is engaged with the lock hole 21 at the lower end of the middle pipe 1B, and at the lower end of the middle pipe 1B. By locking the lock body 3 ″ in the lock hole 21 at the lower end of the lower pipe 1C, the full length of the pull rod 2 can be constrained, and the pull rod 2 does not stretch unnaturally when being carried. It can also be carried by grasping the handle 11. To extend the pulling rod 2 from this state, it is only necessary to press the operation button portion 19a of the handle 11, whereby the lock body 3 'of the upper pipe 1A is moved to the middle pipe 1B. The upper pipe 1A can be pulled out from the inside of the middle pipe 1B, and the upper pipe 1A can be pulled out from the middle pipe 1B. What locking body 3 'of the middle pipe 1B are unlocked by the elastic restoring force of the spring 28, it can be drawn middle pipe 1B from the lower pipe 1C in conjunction with each other.

  After that, if the handle 11 is pulled up to extend the pull rod 2, the lock body 3 "of the middle pipe 1B is now elastically locked into the lock hole 21 at the upper end of the lower pipe 1C, and the middle and lower pipes. 1B and 1C are constrained in the extended state, and the lock body 3 ′ of the upper pipe 1A is elastically locked in the adjustment lock hole 29 arranged at the lowermost part of the middle pipe 1B. If 19a is pressed, the engagement with the lowermost adjustment lock hole 29 of the lock body 3 'of the upper pipe 1A can be released, and the handle 11 and the operation button part 19a are operated as they are, or any adjustment lock hole 29 or The length of the pulling rod 2 can be adjusted by pulling the upper pipe 1A from the middle pipe 1B to the position where the lock body 3 'of the upper pipe 1A is locked in the lock hole 21 at the upper end of the middle pipe 1B. Further, when the pulling rod 2 is returned to the retracted posture from this state, it is only necessary to press the operation button portion 19a again to shrink the pulling rod 2 downward, and the upper pipe 1A is pressed by the operation button portion 19a. The upper pipe 1A can be accommodated in the middle pipe 1B by releasing the lock body 3 ', and the lower end of the middle pipe 1B is locked by the lowering of the upper pipe 1A with respect to the middle pipe 1B. Since 3 ″ is also released from the lock hole 21 at the upper end of the lower pipe 1C, the middle pipe 1B can also be accommodated inside the lower pipe 1C. It is possible to shift to a degenerated posture.

1 is an overall perspective view showing the present invention. It is principal part sectional drawing which shows the internal structure in the expansion | extension attitude | position of the pulling rod 2. FIG. It is principal part sectional drawing which shows the operation | movement at the time of lock release of a lock body, (a) is a figure which shows operation | movement of the lock body of an upper stage pipe, (b) is a figure which shows operation | movement of the lock body of a middle stage pipe. It is a figure which shows the structure which adjusts the full length of a pull rod. It is principal part sectional drawing which shows the internal structure in the retracted posture of a pulling rod. It is a figure which shows the state which hold | maintained the pulling rod in the retracted attitude | position with the lock body of the middle stage pipe, (a) is the sectional view on the 6A-6A line of FIG. 5, (b) is the sectional view on the 6B-6B line of (a). .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe body 1 'Pipe body adjacent to the uppermost part 2 Pulling rod 3 Locking body 3' Locking body in the uppermost position 3 "Locking body located in the lower stage 4 Locking means

Claims (3)

A pulling rod that is telescopically formed by connecting pipe bodies in a telescope shape consisting of three or more stages,
A plurality of lock bodies fixed to the pipe body and accommodated inside the pull rod, and elastically locking the adjacent pipe bodies so that they cannot move relative to each other as they extend, and holding the pull rod in a non-degenerate manner,
The lock body has a small diameter portion and a large diameter portion, and a lock ball is formed to be movable in the radial direction of the pipe body by a slider which is movable in the longitudinal direction of the pipe body. The lock ball is locked to a lock hole formed in the upper end portion of each pipe body that is fixed to the lower end portion of each pipe body that is arranged on the lower stage side, and the adjacent pipe bodies are held indestructible. The slider is urged to a position for pushing the lock ball into the lock hole by the large diameter portion by the compression spring,
The slider of the lock body at the uppermost position is connected to the operation lever formed on the pulling rod via a linear body, and the slider is moved by operating the operation lever so that the small diameter portion is aligned with the lock ball and the uppermost position is moved. The lock body at the position is unlocked and the pulling lever is retracted from above, so that the slider of the lock body positioned below the lock body is pushed down against the compression spring so that the small diameter portion is aligned with the lock ball. unlocking can be operated Te a, are migrated to be able to form a pull rod to degenerate attitude,
And, on the lower side of the pipe adjacent Oite the uppermost portion is adjusted lock hole is formed, the in the lower than the locking member by engaging the locking balls of the locking member of the uppermost position in the adjustment lock hole A pulling and conveying device that is formed so as to be able to restrain an adjacent pipe body at a plurality of relative positions within a plurality of relative positions within a non-engagement release operation range of the lock body, and is capable of adjusting the length of the pulling rod. A pull rod to be stretched or squeezed freely formed by connecting a pipe in telescopic to a three or more stages,
A plurality of lock bodies fixed to the pipe body and accommodated inside the pull rod, and elastically locking the adjacent pipe bodies so that they cannot move relative to each other as they extend, and holding the pull rod in a non-degenerate manner,
The lock body has a small diameter portion and a large diameter portion, and a lock ball is formed to be movable in the radial direction of the pipe body by a slider which is movable in the longitudinal direction of the pipe body. The lock ball is locked to a lock hole formed in the upper end portion of each pipe body that is fixed to the lower end portion of each pipe body that is arranged on the lower stage side, and the adjacent pipe bodies are held indestructible. The slider is urged to a position for pushing the lock ball into the lock hole by the large diameter portion by the compression spring,
The slider of the lock body at the uppermost position is connected to the operation lever formed on the pulling rod via a linear body, and the slider is moved by operating the operation lever so that the small diameter portion is aligned with the lock ball and the uppermost position is moved. The lock body at the position is unlocked and the pulling lever is retracted from above, so that the slider of the lock body positioned below the lock body is pushed down against the compression spring so that the small diameter portion is aligned with the lock ball. Can be unlocked and formed to be able to shift the pulling lever to a retracted position,
A lock hole is also formed at the lower end of the lower pipe body adjacent in the uppermost stage, and the remaining pipe bodies arranged on the lower stage in the extended posture of the pulling rod are second at the lower end. The lock body is formed at a position lower than the uppermost position, and the second small diameter portion and the second large diameter portion in which the small diameter portion and the large diameter portion are inverted to the top and bottom of the slider. the provided, 牽 pull conveyor that holds the pull rod engages the second locking hole by the second locking ball against the compression spring and the second large-diameter portion to degenerate position. A cap is fixed to a lower end portion of each pipe body arranged on the upper side in the extending posture of the pulling rod, and the lock body is held by the cap,
The traction conveyance device according to claim 1 or 2, wherein the slider of each lock body below the uppermost position is pushed down by a cap by retracting the pull rod .

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