JP4228294B2 - Intermediate shelf support device for load carrying cart - Google Patents

Description

  The present invention relates to a support device for a foldable intermediate shelf provided in a load carrying cart.

As a load carrying cart, a back panel and left and right side panels are erected on the cart, and an intermediate shelf that is supported horizontally inside these panels can be folded up in a posture to stand along any one specific panel A configured load carrying cart is known. As a conventional support device for an intermediate shelf of this type of load carrying cart, for example, as described in Patent Document 1, a base portion of the intermediate shelf is supported on the specific panel so as to be swingable up and down via a long hole and a pin. The intermediate shelf is held in the standing folded position by engaging the hook on the specific panel side with the intermediate shelf folded in the standing position.
Japanese Utility Model Publication No. 2-107562

  In the conventional configuration that requires a means such as a hook for holding the intermediate shelf in the upright folding position as described above, it is necessary to perform an operation of locking the hook or the like while the intermediate shelf is supported in the upright folding position with one hand. This makes it difficult to fold the intermediate shelf. Further, the intermediate shelf must be in the form of a mesh panel that can hook a hook or the like, or to which a member to be locked such as a hook is attached, and the configuration of the intermediate shelf is also restricted. Of course, in the configuration described in Patent Document 1, for example, without holding the intermediate shelf in the upright folding posture with the hook, by contacting the bearing member having the long hole on the intermediate shelf side to the specific panel side, It is possible to hold the intermediate shelf in the upright folded position, but in this case, if the intermediate shelf in the upright folded position is accidentally lifted or the intermediate shelf in the upright folded position is lifted due to vibration or the like, the intermediate shelf There is a risk of falling to the posture side, which is problematic in terms of safety.

  An object of the present invention is to provide an intermediate shelf support device for a load carrying carriage that can solve the above-described conventional problems, and means for attaching the same will be described with reference numerals of embodiments to be described later. As shown, the back panel 2 and the left and right side panels 3 and 4 are erected on the carriage 1, and the intermediate shelf 5 supported horizontally inside these panels 2 to 4 is any one specific panel (side panel). 3) In the load carrying cart configured to be foldable to stand up along 3), the specific panel (side panel 3) can be moved up and down along the vertical member 13a constituting the specific panel and the specific An elevating member 14a supported on a horizontal member 12a constituting the panel is provided, and on the intermediate shelf 5 side, one side of which is supported by the elevating member 14a so as to be swingable up and down by a horizontal support shaft 16a, Swing the middle shelf 5 upward from the horizontal position A shelf-side cam portion 22 that acts on the horizontal member 12a of the specific panel to move the elevating member 14a upward, and a horizontal direction orthogonal to the horizontal support shaft 16a when the intermediate shelf 5 is in a horizontal posture. Is provided with an operation member 21 that is movable within a certain range, and the elevating member 14a is provided with a locking recess 23 into which the operation member 21 is fitted when the intermediate shelf 5 is in a standing posture, and the intermediate shelf 5 And an elevating member side cam portion 24 that pushes up the operating member 21 and guides it onto the engaging recess 23 when the oscillating member moves upward from a horizontal posture, and the intermediate shelf 5 is in an upright posture and the elevating member When 14a is supported on the horizontal member 12a, a fall prevention portion (shelf side cam portion 22) adjacent to the inside of the horizontal member 12a is provided on the intermediate shelf 5 side.

  In carrying out the present invention having the above-described configuration, as described in claim 2, the fall-preventing portion can be shared by the shelf-side cam portion 22. Further, as described in claim 3, the intermediate shelf 5 is provided with a pair of bearing members 15a and 15b protruding toward the specific panel (side panel 3) in the axial direction of the horizontal support shaft 16a. The bearing members 15a and 15b are pivotally supported on the elevating members 14a and 14b by horizontal support shafts 16a and 16b, the shelf cam portions 22 are formed on the outer end sides of the bearing members 15a and 15b, and the inner end side is formed. A long hole 20 for supporting the operation member 21 is provided, and both end portions of the rod-shaped operation member 21 can be supported by the long holes 20 of the bearing members 15a and 15b.

  When the configuration described in claim 3 is adopted, a pair of the elevating members 14a and 14b are provided so as to correspond to the respective bearing members 15a and 15b, and each bearing member is provided. 15a and 15b have both side plate portions 18 sandwiching the elevating members 14a and 14b, respectively. In each side plate portion 18, the bearing members 15a and 15b are respectively connected to the elevating members 14a and 14b by the horizontal support shafts 16a and 16b. The shelf-side cam portions 22 are formed on the outer end sides of the both side plate portions 18 and the long holes 20 can be provided on the inner end sides. Further, in this case, as described in claim 5, each of the elevating members 14a and 14b is a U-shaped planar shape that is fitted around the vertical members 13a and 13b, and both side plates projecting toward the intermediate shelf 5 side. The horizontal support shafts 16 a and 16 b are supported by the portion 19, and the locking recess 23 and the elevating member side cam portion 24 can be formed in each of the both side plate portions 19.

  Further, as described in claim 6, the operation member 21 can be configured to descend by gravity and fit into the locking recess 23 when the intermediate shelf 5 is in the standing posture. As described in claim 7, a spring 25 for urging the operation member 21 toward the horizontal support shafts 16a and 16b can be provided.

  According to the intermediate shelf supporting device for a load carrying cart according to the present invention having the above-described configuration, the intermediate shelf is not supported by the long hole and the pin as in the prior art, but can be swung up and down with a horizontal support shaft with respect to the lifting member. Therefore, there is no possibility that the intermediate shelf in the horizontal posture will move in the horizontal direction. Therefore, the intermediate shelf can be supported stably and safely simply by placing the free end side of the intermediate shelf in the horizontal posture on the adjacent panel side via the hook or the like. Moreover, when the free end side is lifted to fold the intermediate shelf, the base of the intermediate shelf is automatically raised together with the lifting member by the action of the shelf-side cam portion, and then the shelf-side cam portion is the horizontal member on the panel side. As the conventional shelf is supported by long holes and pins as in the conventional structure, the shelf-side fall prevention part is adjacent to the inside of the panel-side horizontal member, and the intermediate shelf is folded upright. It can be held in a posture. That is, there is no need for a separate locking means such as a hook for holding the intermediate shelf in the upright folding position as in the prior art, and not only the folding operation of the intermediate shelf is easy and easy, but also the intermediate shelf is locked with a hook or the like. Since no part is required, the configuration of the intermediate shelf is not restricted.

  Furthermore, when the intermediate shelf is in the upright folding position as described above, the shelf-side operation member automatically fits into the locking recess of the panel-side lifting member in the process, and the Even if the intermediate shelf is locked in the standing folding position, the intermediate shelf in the standing folding position has the first holding function due to the adjoining of the horizontal member on the panel side and the fall prevention part on the shelf side, and the shelf side The operation member and the second holding function by the engagement of the locking recesses of the panel side lifting member are held in the standing folded posture. Therefore, when returning the intermediate shelf in the standing folded position to the horizontal position, the first holding function is released by lifting the intermediate shelf in the standing folded position, and the operating member is detached from the locking recess of the panel-side lifting member. The intermediate shelf can only be turned to the horizontal position after both the release of the second holding function by the operation to be performed, so that the intermediate shelf in the standing and folding position can be lifted by an erroneous operation or vibration. Even if there is nothing, since the panel-side elevating member rises integrally with the intermediate shelf, the second holding function is not released even if the first holding function is released. With the holding function, the intermediate shelf is surely held in the standing folded position, and safety is improved.

  In addition, according to the structure of Claim 2, the number of parts reduces compared with the case where a shelf side fall prevention part is comprised separately from a shelf side cam part door, and a structure can be simplified and implemented at low cost. it can.

  Moreover, according to the structure of Claims 3-5, the intensity | strength and stability of the intermediate | middle shelf support apparatus of this invention can be improved, According to the structure of Claim 6, it is described in Claim 7. The structure is simpler than the structure and can be implemented at low cost. Conversely, according to the structure described in claim 7, the operation of the second holding function described above can be ensured.

  A specific example of the present invention will be described below with reference to the accompanying drawings. A load carrying cart in this embodiment is a rear panel 2 and left and right side panels 3 and 4 erected around the cart 1, The intermediate shelf 5 is pivotally supported by the side panel 3 so as to be swingable up and down. Reference numeral 6 denotes a stay that is detachably mounted on the middle height of the front side of the left and right side panels 3 and 4.

  More specifically, the cart 1 includes a bottom panel 7 supported on the lower side of the back panel 2 so as to be swingable up and down, and wheels 8a and 8b provided below the left and right ends of the back panel 2. And the side panel 4 on the side that does not support the intermediate shelf 5 can be folded so as to overlap the back panel 2. To the side of the back panel 2. Further, the bottom panel 7 turned to the horizontal position with respect to the back panel 2 is coupled to the left and right side panels 3 and 4 with the left and right sides supported by the lower sides of the left and right side panels 3 and 4. The intermediate shelf 5 is supported by the other side panel 4 when the intermediate shelf 5 is turned to the horizontal posture with respect to the side panel 3.

  Thus, as shown in FIG. 1A, the above-described load carrying cart can use the intermediate shelf 5 by turning the intermediate shelf 5 in a horizontal posture and laying it between the left and right side panels 3 and 4. . When the intermediate shelf 5 is not used, the intermediate shelf 5 can be in an upright folded position along the side panel 3 as shown in FIG. 1B. Further, as shown in FIG. 1C, the stay 6 is removed from the side panel 4 and suspended on the front side of the side panel 3, and the bottom panel 7 is erected along the back panel 2, and the bottom panel 7 is moved to the back panel. By folding the side panel 4 inward so as to be sandwiched between the two, the entire load transport cart can be folded into an L-shaped plane, and the folded load transport cart can be nested in the same number as required. Is.

  The back panel 2 and the left and right side panels 3 and 4 have basically the same structure. As shown in FIG. 2, a gate-shaped peripheral frame (such as a round pipe material) is formed on the angle member 10 constituting the lower side. 11 is erected, and horizontal members (such as steel shapes) 12 and 12a are installed in a plurality of vertical stages between both end support portions 11a and 11b of the peripheral frame 11, and the upper side member 11c of the peripheral frame 11 and the angle member 10 are Between them, vertical members (such as round bar members thinner than the surrounding frame 11) 13, 13a, 13b are installed at appropriate intervals in the length direction of the horizontal member 12.

  As shown in FIGS. 2 and 3, the vertical members 13 a and 13 b adjacent to the both end support portions 11 a and 11 b of the peripheral frame 11 on the middle horizontal member 12 a of the side panel 3 are respectively provided with elevating members 14 a and 14 b. A pair of bearing members 15a and 15b that are externally fitted so as to be movable up and down and are fixedly projected from one side of the intermediate shelf 5 are concentric with the lifting members 14a and 14b by horizontal support shafts (bolt nuts) 16a and 16b. The intermediate shelf 5 is supported so that it can swing up and down with the horizontal support shafts 16a and 16b as fulcrums. When the intermediate shelf 5 is turned downward, the inverted L-shaped hooks 17 a and 17 b placed near the both ends of the middle horizontal member 12 a of the side panel 4 are fixed from the other side of the intermediate shelf 5. The intermediate shelf 5 is supported by the hooks 17a and 17b in a horizontal posture.

  As shown in FIGS. 4 and 5, the elevating members 14a and 14b are U-shaped in a planar shape that is fitted around the vertical members 13a and 13b of the side panel 3, and the bearing members 15a and 15b are elevating members 14a. , 14b, and both side plate portions 19 extending to the intermediate shelf 5 side of the elevating members 14a, 14b and both side plate portions 18 of the bearing members 15a, 15b are perpendicular to the side panel 3. It is pivotally connected by horizontal support shafts (bolts and nuts) 16a and 16b adjacent to the members 13a and 13b. When the intermediate shelf 5 is supported in a horizontal posture by the hooks 17a and 17b, the both side plates 18 of the bearing members 15a and 15b are positioned so as to be positioned between the horizontal support shafts 16a and 16b and the intermediate shelf 5. Horizontally oriented long holes 20 are provided, and the operation member 21 is provided with both bearing members 15a and 15b so that both end portions of the round bar-shaped operation member 21 penetrate freely in the long hole length direction. It is erected between.

  Thus, as shown in FIG. 5A, when the intermediate shelf 5 is supported by the hooks 17a and 17b in the horizontal posture on the side plates 18 of the bearing members 15a and 15b, the horizontal support shafts 16a and 16b are supported. A shelf-side cam portion 22 that protrudes to the side opposite to the side where the intermediate shelf 5 is located and extends on the horizontal member 12a of the side panel 3 is formed. An open locking recess 23 and an elevating member side cam portion 24 adjacent to the outside of the locking recess 23 are formed.

  As described above, the intermediate shelf 5 is rotated downward around the horizontal support shafts 16a and 16b, and the hooks 17a and 17b of the intermediate shelf 5 are placed on the horizontal member 12a in the middle of the side panel 4. When assembled, as shown in FIG. 5A, the elevating members 14a and 14b pivotally supporting the intermediate shelf 5 are placed and supported on the horizontal member 12a of the side panel 3 by gravity, and in this state The intermediate shelf 5 is configured to be horizontal. In this state, the intermediate shelf 5 can be used as a loading platform, but when the intermediate shelf 5 is not used, the intermediate shelf 5 is rotated upward around the horizontal support shafts 16a and 16b.

  As shown in FIG. 5B, the shelf side cam portions 22 of the bearing members 15a and 15b that rotate integrally with the intermediate shelf 5 by the upward rotation of the intermediate shelf 5 are lowered around the horizontal support shafts 16a and 16b. To the horizontal member 12a of the side panel 3 so that the elevating members 14a and 14b are pushed up. That is, as the intermediate shelf 5 is rotated upward, the intermediate shelf 5 is automatically pushed up along the vertical members 13a and 13b of the side panel 3 together with the elevating members 14a and 14b.

  On the other hand, as shown in FIG. 5B, the operation member 21 supported by the long holes 20 of the bearing members 15a and 15b that rotate together with the intermediate shelf 5 by the upward rotation of the intermediate shelf 5 is oriented vertically. In the long hole 20 that changes to the vertical axis, it descends in the direction approaching the horizontal support shafts 16a and 16b due to gravity, but the intermediate shelf 5 (bearing members 15a and 15b) around the horizontal support shafts 16a and 16b is turned upward. As the operation proceeds, the operation member 21 is pushed up by the cam portions 24 on the lifting members 14a and 14b side, and the operation member pushed up by the raising / lowering member side cam portion 24 when the intermediate shelf 5 rotates to a substantially vertical posture. 21 reaches the upper position of the locking recess 23 on the elevating members 14a and 14b side, and as shown in FIG. 6A, the operation member 21 descends in the long hole 20 due to gravity, and the locking recess on the elevating members 14a and 14b side. 23 To become. In other words, when the intermediate shelf 5 is rotated to a substantially vertical posture, the long holes on the bearing members 15a and 15b side so that the operation member 21 can be fitted into the locking recesses 23 on the lifting members 14a and 14b side. The position of 20 and the positions of the cam portions 24 and the locking recesses 23 on the lifting members 14a and 14b side are set.

  By rotating the intermediate shelf 5 upward to a substantially vertical posture as described above, the intermediate shelf 5 is automatically substantially vertical with the operation member 21 and the locking recess 23 with respect to the elevating members 14a and 14b. At this time, the shelf-side cam portions 22 of the bearing members 15a and 15b integrally formed with the intermediate shelf 5 are positioned on the inner side of the horizontal member 12a of the side panel 3. Is configured to do. Accordingly, by lowering the intermediate shelf 5 locked in the substantially vertical posture by the operation member 21 and the locking recess 23 along the vertical members 13a and 13b of the side panel 3, as shown in FIG. The portion 22 enters the inside of the horizontal member 12 a of the side panel 3, and in this state, the elevating members 14 a and 14 b are placed and supported on the horizontal member 12 a of the side panel 3.

  As described above, the intermediate shelf 5 can be switched to the folding posture in which the intermediate shelf 5 stands up along the side panel 3. The intermediate shelf 5 in this folding posture is connected to the horizontal member 12 a of the side panel 3 and the intermediate shelf 5 side. A first holding function by adjoining the cam part 22 and a second holding function by engaging the operation member 21 on the intermediate shelf 5 side and the locking recesses 23 of the elevating members 14a and 14b on the side panel 3 side, The intermediate shelf 5 is lifted along the vertical members 13a and 13b of the side panel 3 from the inside position of the horizontal member 12a of the side panel 3, and the cam on the side of the intermediate shelf 5 is temporarily held. Even if the portion 22 is released upward and the first holding function is released, the intermediate shelf 5 is reliably held in the upright folding posture by the second holding function, and there is no risk of unexpectedly falling down. In other words, in the above embodiment, the cam portion 22 on the side of the intermediate shelf 5 constitutes the fall prevention portion of the intermediate shelf 5 in the standing and folding posture, but the side panel is similar to the shelf side cam portion 22. It is also possible to project a protruding member that can enter the inside of the three horizontal members 12a from the intermediate shelf 5 separately from the bearing members 15a and 15b, and to use this protruding member as a fall prevention portion.

  When the intermediate shelf 5 held in the standing folded posture is returned to the horizontal posture and used as a loading platform, first, the intermediate shelf 5 in the standing folded posture is first set to the vertical members 13a and 13b of the side panel 3, as shown in FIG. 6B. The first holding function is released by moving the cam portion 22 on the side of the intermediate shelf 5 upward from the inner position of the horizontal member 12a of the side panel 3 so as to slide upward. Next, as shown in FIG. 6C, the operation member 21 is pulled upward against gravity, and is slid upward in the long hole 20 so as to be separated upward from the locking recess 23 on the lifting members 14a and 14b side. Release the second holding function. This two-stage operation is replaced with a single operation of pulling up the operation member 21 of the intermediate shelf 5 held in the upright folding position, and the second holding function is first released, and the operation member 21 that is subsequently lifted has a long hole. It is also possible to release the first holding function by lifting the intermediate shelf 5 through the upper end of 20.

  If the intermediate shelf 5 is free with respect to the elevating members 14a and 14b as described above, the intermediate shelf 5 is turned downward around the horizontal support shafts 16a and 16b as shown in FIGS. The hooks 17a and 17b are placed and engaged with the horizontal member 12a of the side panel 4 as shown in FIG. At this time, the elevating members 14a and 14b are moved down by gravity integrally with the side of the intermediate shelf 5 supported via the horizontal support shafts 16a and 16b, and on the horizontal member 12a of the side panel 3 as shown in FIG. 5A. Since it is placed, the intermediate shelf 5 is horizontally supported by the middle horizontal member 12a of the left and right side panels 3, 4 as described above.

  In the above-described embodiment, when the intermediate shelf 5 is rotated upward from the horizontal posture, the operation member 21 moves up and down by moving in the elongated hole 20 in the direction approaching the horizontal support shafts 16a and 16b by gravity. Although it is configured to engage with the locking recess 23 on the side of the members 14a and 14b, as shown in FIG. 8, the operating member 21 is positively biased in a direction approaching the horizontal support shafts 16a and 16b. The spring 25 can be used in combination so that the operation can be performed reliably. As shown in the figure, the spring 25 can be a tension coil spring interposed between two horizontal ends 16a and 16b near the two ends of the operating member 21 passing through the long hole 20; It can also be constituted by a compression coil spring or a leaf spring that presses the two portions in the vicinity of both ends penetrating the long hole 20 of the member 21 toward the horizontal support shafts 16a and 16b. Further, these springs 25 can be provided at one intermediate position in the length direction of the operation member 21.

  Further, the pair of elevating members 14a and 14b can be integrally connected by a connecting member to numerically form one elevating member. On the other hand, the bearing members 15a and 15b are projected from the intermediate shelf 5, but a notch recess is formed on the side of the intermediate shelf 5 so that the bearing portions on the lifting and lowering members 14a and 14b are loosely fitted. The intermediate shelf 5 can be directly supported on the elevating members 14a and 14b by a horizontal support shaft. In addition, when one wide elevating member is used as described above, a locking recess 23 is provided in one middle portion of the width, and the intermediate shelf 5 can be fitted into this one locking recess. Various operation members can also be provided.

  The load carrying cart provided with the intermediate shelf 5 supported by the present invention is not limited to a foldable load carrying cart as in the above embodiment, and may be a load carrying cart having a structure that cannot be folded, It may be a load transport cart with a structure that can be folded by other methods. The intermediate shelf 5 may be pivotally supported on the back panel 2 so as to be swingable up and down. Furthermore, the support method on the free end side of the intermediate shelf 5 is not particularly limited.

Fig. A is a schematic perspective view showing a state in which the intermediate shelf is used, Fig. B is a schematic perspective view showing a state in which the intermediate shelf is switched to the upright folding position, and Fig. C is a schematic perspective view showing a state in which the load carrying carriage is folded into a plane L shape. It is. Fig. A is a side view of the load carrying cart, and Fig. B is a front view of the load carrying cart (the back panel is not shown). It is a partially notched cross-sectional top view explaining an intermediate shelf support structure. It is a cross-sectional top view of the support apparatus principal part of an intermediate shelf. FIG. A is a longitudinal front view of the main part of the support device of the intermediate shelf, and FIG. B is a vertical front view of the main part of the support device showing an intermediate state when the intermediate shelf is folded. Fig. A is a longitudinal front view of the main part of the support device of the intermediate shelf in the standing folded state, and Figs. B and C are vertical front views of the main part of the support device for explaining the initial operation when the intermediate shelf is returned to the horizontal posture. . FIGS. A and B are longitudinal sectional front views of the main part of the support device for explaining the operation of the final stage when the intermediate shelf is returned to the horizontal posture. It is a vertical front view of the principal part of the support device showing another embodiment.

Explanation of symbols

1 Bogie 2 Back panel 3, 4 Left and right side panels 5 Intermediate shelves 12, 12 a Side panel horizontal members 13, 13 a, 13 b Side panel vertical members 14 a, 14 b Lifting members 15 a, 15 b Bearing members 16 a, 16 b Horizontal support shafts (bolts nut)
17a, 17b Hook 18 Both side plate portion 19 of bearing member Both side plate portion 20 of elevating member Long hole 21 Round bar shaped operation member 22 Shelf side cam portion 23 Locking recess 24 Elevating member side cam portion 25 Spring

Claims (7)

  Carrying load that is constructed so that a back panel and left and right side panels are erected on the carriage, and an intermediate shelf that is horizontally supported inside these panels can be folded up along any one specific panel. In the dolly, the specific panel is provided with an elevating member that can be moved up and down along a vertical member constituting the specific panel and supported on a horizontal member constituting the specific panel. On the side of the intermediate shelf, the side of which is pivotally supported by a horizontal support shaft, when the intermediate shelf is swung upward from the horizontal position, it acts on the horizontal member of the specific panel to raise the elevating member. A shelf-side cam portion to be moved, and an operation member that is movable within a certain range in a horizontal direction orthogonal to the horizontal support shaft when the intermediate shelf is in a horizontal posture. When the robot is in a standing position There are provided a locking recess into which the member is fitted, and an elevating member side cam portion that pushes up the operation member and guides it to the locking recess when the intermediate shelf swings upward from a horizontal posture. An intermediate shelf support device for a load carrying carriage, wherein the fall prevention portion adjacent to the inside of the horizontal member is provided on the intermediate shelf side when the elevating member is supported on the horizontal member in a standing posture.   The intermediate shelf support device for a load carrying carriage according to claim 1, wherein the fall prevention portion is constituted by the shelf side cam portion.   A pair of bearing members projecting toward the specific panel are provided on the intermediate shelf so as to project in the axial direction of the horizontal support shaft, and each of the bearing members is supported by the elevating member on the horizontal support shaft. The shelf-side cam portion is formed on the outer end side, and a long hole for supporting the operation member is provided on the inner end side, and both end portions of the rod-shaped operation member are supported by the long holes of both bearing members. The intermediate shelf supporting device for a load carrying carriage according to claim 1 or 2.   A pair of the elevating members is provided so as to correspond to each bearing member, and each bearing member includes both side plate portions sandwiching the elevating member, and in each side plate portion, each bearing member is attached to each elevating member on the horizontal support shaft. The intermediate part of the load carrying cart according to claim 3, wherein the shelf-side cam portion is formed on each of the outer end sides of the both side plate portions and the elongated hole is provided on each of the inner end sides. Shelf support device   Each of the elevating members has a U-shape in a planar shape that is externally fitted to the vertical member, and supports the horizontal support shaft by both side plate portions protruding toward the intermediate shelf side, and the locking to each side plate portion. The intermediate shelf supporting device for a load carrying carriage according to claim 4, wherein the recess and the elevating member side cam portion are formed.   The middle of the load carrying cart according to any one of claims 1 to 5, wherein the operation member is configured to descend by gravity and fit into the locking recess when the intermediate shelf is in a standing posture. Shelf support device. The intermediate shelf supporting device for a load carrying carriage according to any one of claims 1 to 5, further comprising a spring for urging the operating member toward the horizontal support shaft.

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