JP5901187B2 - stretcher - Google Patents

Description

  The present invention relates to a stretcher that can be folded and stored compactly.

  In general, a stretcher is composed of a pair of struts extending in the longitudinal direction and a sturdy sheet spanned between them. Some of these stretchers are designed so that they can be stored compactly when not in use. Each strut is divided into two, and when used, one end is inserted into the other and connected in the axial direction. There is something to do. In addition, there is a structure in which each support is divided into two support members near the center and can be bent only in one direction around a connection point provided between them. However, simply by making the support column foldable, the support members are close to each other when the support member is bent, so that a problem such as sandwiching an object between the two tends to occur.

  Therefore, as described in the following Patent Document 1, it is possible to fold in the mountain fold direction with the supporting column as two supporting members and with the loading surface facing upward, and between the supporting members when folded. Are disclosed in which a certain gap can be formed.

  As shown schematically in FIG. 14, each column is composed of two column members 104, 104 and a connecting member 114 that connects them, and each column member 104, 104 is connected to the connecting member 114. The pins 123 and 123 are connected to each other so as to be rotatable. The support members 104 and 104 are constrained to rotate more than a certain amount by contacting the inner surface of the connecting member 114, and the support members 104 and 104 cannot rotate any more when they are opened in a straight line from the folded state. ing.

  Therefore, even when a moment in the M direction in the drawing acts on each of the support members 104 and 104 by placing a person or an article on the stretcher, the straight state can be maintained without being folded. More specifically, the lower side of each of the support members 104, 104 (point P in the drawing) abuts against the inner surface of the connecting member 114, so that a reaction force against the moment is generated and the straight shape is maintained. Will do.

  On the other hand, since the pins 123 and 123 that are the rotation centers of the support members 104 and 104 are provided apart from each other, a gap can be created between the support members 104 and 104 in the folded state. It has become.

  Furthermore, although omitted in FIG. 14, in the configuration in Patent Document 1, each support member 104, 104 is formed into a pipe shape, and the lock member fitted into one inner surface of the one end is advanced toward the inner surface of the other end. It is possible to fit. Thus, by inserting the common lock member into the insides of both the column members 104, 104, it is possible to fix the column members 104 in an open state in a substantially straight line. Therefore, even when a moment occurs in the mountain fold direction, which is opposite to that when the stretcher is loaded, such as lifting the connecting member 114 from the lower side, that is, in the direction opposite to the M direction in the drawing, The support members 104 and 104 do not come into contact with each other and are not folded.

JP 2000-24037 A

  However, in the conventional configuration as described above, the operability is poor because the column member 1 is opened in a straight line and then the lock member is operated to shift to the locked state. The deployment operation takes time and cannot be used quickly in an emergency.

  Further, in the conventional stretcher described above, the deformation of the member is likely to occur due to the action of the moment generated when the stretcher is loaded, and problems such as a change in the overall shape accompanying such a deformation of the member and a deterioration in operability due to an increase in sliding resistance. Occurs.

  Specifically, in the stretcher having the conventional configuration shown in FIG. 14, the reaction force against the moment in the M direction in the figure when the stretcher is loaded is connected to the lower side (point P in the figure) of the support members 104 and 104. It is generated by contacting the inner surface of the member 114. Since the contact portion P is a point contact, a very large stress locally acts on the periphery thereof. Further, since the column member 104 is often configured in the shape of a hollow pipe for weight reduction, the reaction force described above acts in a bending direction with a low strength for the pipe, so that deformation tends to occur. Such a problem is also the same for the connecting member. Deformation is likely to occur due to the action of a very large local stress that causes bending in the thickness direction while making point contact with the inner surface.

  In this way, the strut members 104, 104 and the connecting member 114 are in point contact when loaded on a stretcher, and a large load is easily applied to cause deformation, so that the strut members 104, 104 are opened in a straight line. Cannot be maintained. Therefore, the form at the time of use is not stable, and the position where the lock is applied becomes unstable and the operability is deteriorated. Further, not only the deformation but also the strut members 104, 104 and the connecting member 114 are not only deformed but also scratched, so that the sliding resistance is increased, and there is a possibility that operations such as bending and unfolding become difficult. .

  Depending on the dimensional relationship, the reaction force against the moment generated when the stretcher is loaded is not between the support members 104, 104 and the inner surface of the connecting member 114, but exclusively between the support members 104, 104 and the lock member fitted therein. The point where the reaction force is generated is a point contact, and the point where the reaction force is generated is the bending direction of the low-strength plate, which causes the same problem as above. Become.

  An object of the present invention is to effectively solve such problems. Specifically, the column member is excellent in operability related to the expansion and folding of each column, and constitutes the column member when each column is bent. Another object of the present invention is to provide a stretcher that is less likely to cause an object to be sandwiched between them, and that is less likely to be deformed or damaged in each member such as a column member and malfunction caused by them.

  In order to achieve this object, the present invention takes the following measures.

That is, the stretcher according to the present invention is a stretcher in which a sheet is stretched over a pair of struts. Each strut includes two strut members, a connector for connecting both strut members in a foldable manner, and a strut member. A fixing means for fixing the strut members to each other in a state in which the axis is substantially straight, and the connecting device has a use position in which the end surfaces of the two strut members are in close contact or close to each other and the end surfaces are in contact with each other. These two strut members are connected so as to be relatively rotatable around a fulcrum set at a position separated from the axial center of both strut members between the folding position where both strut members are folded in a mountain fold, and the fixing means is Provided between both strut members, when the both strut members rotate to the use position, the lock state is controlled, and the locked state is released by an operation applied to a part of the fixing means. Monodea is, the operation unit to be subjected to the lock release operation is mounted rotatably to the base end to the fulcrum, it is formed as an operating lever is extended along an end portion on one of the strut members cage, by operating the operating lever in a direction in which said end portion is close to the post member of the one, characterized that you unlock state.

  If comprised in this way, while changing a support | pillar member from a mountain fold state to a linear state, end surfaces will face each other and it will transfer to a locked state, and it will be easy to cancel | release a lock | rock and to make it a mountain fold state again by cancellation | release operation. As a result, operability is improved. Furthermore, since the fulcrum is located at a position away from the axis of the support member, a certain distance is secured between the support members folded in a mountain, and the possibility of sandwiching surrounding articles can be reduced.

  Furthermore, in order to suppress the deformation and damage of the strut members due to the moment generated during loading, it is effective to reduce the local stress by applying the load caused by the moment in the direction of higher strength and making the contact location a surface contact. Therefore, when a moment in the valley fold direction acts on the both strut members in the use position, it is preferable that the end surfaces abut against each other to support the load generated by the moment.

  Further, in order to prevent the mechanism for locking or unlocking the strut member from causing a risk of sandwiching a surrounding article, the fixing means is attached to one strut member, and both strut members are provided. The first lock portion that enters the other strut member as it approaches the use position, and the first lock portion that is attached to the other strut member and that enters the use position of both strut members and engages both. It is suitable to comprise so that the 2nd lock | rock part which hold | maintains a support | pillar member in a use position may be provided.

  In addition, in order to improve the workability related to assembly and folding into the use state compared to the case where the pipe parts are directly locked to each other, in order to make the appearance effectively adjusted, each strut member is connected to the pipe part. The joint portion is integrally provided at the end portion of the pipe portion and has a joint portion with a fulcrum set at a position taken out from the pipe portion, and both joint portions are connected to each other at the fulcrum in a rotatable manner by a coupling tool, It is preferable that one joint portion enters into the other joint portion, and the first lock portion provided in one of the joint portions is engaged with the second lock portion provided in the other.

  In addition, in order to effectively secure the portion where the end faces abut and to effectively adjust the appearance, at the use position, the end face of the pipe part constituting one strut member and the joint part constituting the other strut member And a pipe part of one strut member and the pipe part of the other strut member are apparently provided in the external region. It is preferable to configure so as to be continuous in a single pipe shape.

  Further, in order to prevent the lock member from being easily released without a lock release operation at the time of locking, it is preferable to make the rotation direction of the column member different from the engagement / disengagement direction of the lock portion. One of the lock portions has a notch at the edge of the joint portion, and the other has a shaft portion that extends in a direction orthogonal to the axis of the column member and is elastically biased in one of the axis directions. With the rotation of the members toward the use position, the edge around the notch pushes the shaft against the elastic force, and when it reaches the use position, the shaft is rotated by the elastic force in the direction of rotation of both strut members. It is preferable that the configuration is such that the notch is engaged with the cutout along a different direction, and the shaft can be detached from the notch by the unlocking operation.

  Furthermore, in order to further improve the operability by incorporating a mechanism for unlocking in a compact manner, the operation unit to be unlocked can rotate the base end around the fulcrum inside the joint. And is formed as an operating lever that is pulled out from the joint portion and extended in a direction inclined with respect to the pipe portion of one of the strut members, and the end portion of the operating lever is close to the pipe portion. It is preferable that the first lock portion or the second lock portion is biased in the direction of releasing the engagement at a part of the base end by operating in the direction.

  According to the present invention described above, since deformation and damage due to moment generated when deployed and loaded are small, it can be used while maintaining its form and operational stability over a long period of time. It is possible to provide a stretcher having good operability that can be easily unlocked, and having a small risk of pinching an object by forming a gap between the support members when each support is bent. .

The bottom view of the stretcher which concerns on one Embodiment of this invention. The bottom view which shows the state which contracted the stretcher in the width direction rather than the state of FIG. The bottom view which shows the state which folded the stretcher in the longitudinal direction from the state of FIG. The side view in the state of FIG. 3 which folded the stretcher to the longitudinal direction. The expanded side view which shows the bending part periphery when the support | pillar in the same stretcher is expand | deployed and it exists in a locked state. The disassembled perspective view of the member around the bending part of the support | pillar in the stretcher. The expanded side view which shows the bending part periphery when it is set as the accommodation state which bent the support | pillar in the stretcher from the state of FIG. The expansion side view which shows the bending part periphery when the support | pillar in the same stretcher is developed from the stowed state of FIG. 7, and the front-end | tip upper part of the other joint part has entered into the inside of one joint part. FIG. 9 is an enlarged side view showing the periphery of the bent portion when the support on the stretcher is further expanded from the state of FIG. 8 and is in a state immediately before locking. The expanded side view which shows the bending part periphery when the lock | rock of the support | pillar in the same stretcher is made into the cancellation | release state. The fragmentary sectional perspective view which shows the bending part periphery when the connection pipe in the stretcher is made into a locked state. The bottom view which shows the bending part periphery when the connection pipe in the stretcher is made into a locked state. The bottom view which shows the bending part periphery of a connection pipe when the stretcher is made into the state contracted in the width direction rather than the state of FIG. The principal part enlarged side view which simplified and showed the bending part periphery of the support | pillar in the conventional stretcher.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the stretcher of this embodiment has a pair of support columns 3, 3 provided substantially along the longitudinal direction, a sheet 2 laid between them, and the support columns 3, 3 at a predetermined interval. It is comprised from a pair of connection pipes 6 and 6 hold | maintained in parallel. Resins or rubber grips 81 to 81 are respectively fitted to both ends of the columns 3 and 3 to form handle portions of the operator.

  In addition, the figure shows the time when it sees from the back surface side when the bottom face of the stretcher 1, ie, a loading surface, is made into a table | surface. Hereinafter, the direction in which the stretcher 1 of the present embodiment extends, that is, the left-right direction in the figure is referred to as the longitudinal direction, and the direction in which the pair of columns 3 and 3 are separated, that is, the up-down direction in the figure is referred to as the width direction. Furthermore, the directions of mountain fold and valley fold are referred to when the stacking surface of the stretcher 1 is directed upward.

  Each column 3, 3 constitutes one continuous rod-like body by connecting two column members 4a, 4b in the longitudinal direction via the bent portion 3a. The sheet 2 is formed in a generally rectangular shape by thick cloth, and the positions corresponding to the columns 3 and 3, that is, the positions corresponding to the upper side and the lower side in the figure, are continuous loops (not shown) in the longitudinal direction. Formed. By positioning each of the columns 3 and 3 through the loop, the sheet 2 is positioned in the width direction with respect to the column 3.

  Each of the connection pipes 6 and 6 constitutes one continuous rod-like body by connecting the connection pipe members 6a and 6b in the width direction via the bent portions 6c. And the edge part of each connection pipe 6 and 6 is attached to the lower part of the support | pillars 3 and 3 via the support parts 51-51. Therefore, an opening hole (not shown) is provided in the seat 2 at a position corresponding to each of the support portions 51 to 51, and the support portions 51 to 51 can be attached to the support columns 3 and 3 through the opening holes. . By doing so, it is possible to regulate the position of the seat 2 in the longitudinal direction with respect to the columns 3 and 3 simultaneously with the attachment of the connection pipes 6 and 6.

  The sheet 2 is provided with rectangular openings 2a and 2a for exposing the bent portions 3a and 3a provided on the support columns 3 and 3, respectively. By making such a shape, the sheet 2 does not act as a resistance when the columns 3 and 3 described later are bent, and further, excessive tension acts on the sheet 2 itself. It can be suppressed.

  The stretcher 1 having such a basic configuration has a configuration for contracting in the width direction as shown in FIG. That is, as described above, each of the connection pipes 6 and 6 is configured such that the connection pipe members 6a and 6b are connected via the bent portion 6c, and the connection pin 52 provided in the bent portion 6c is used as a base point. The connection pipe members 6a and 6b are rotatable relative to each other, and the connection pipe members 6a and 6b are rotatably supported by support portions 51 fixed to the columns 3 and 3. By doing so, the connecting pipe members 6a, 6b can be brought close to each other while being folded inward in the longitudinal direction in cooperation.

  Further, as will be described in detail later, the bent portion 6c locks the connection pipe members 6a and 6b so as to separate the support columns 3 and 3 and releases the locked state. The fixing means 7 is provided.

  Further, the stretcher 1 of this embodiment has a configuration for bending in the longitudinal direction as shown in FIG. 2 is a view in which the right side portion in the figure supported by the support members 4b and 4b is supported by the support members 4a and 4a by half-rotating in the front direction of the drawing with the center portion as a base point from the state of FIG. It shows a state of being superimposed on the middle left part.

  As described above, each of the support members 3 and 3 is configured as a form in which the support members 4a and 4b are connected via the bent portion 3a, and based on the connecting pin 23 as a connecting tool provided in the bent portion 3a. The column members 4a and 4b are relatively rotatable. By doing so, by rotating about the connecting pin 23 as a base point, the straight pillar members 4a and 4b can be folded in the mountain fold direction so as to overlap each other.

  Further, the connection pipe 6 provided on the column members 4a, 4a side and the connection pipe 6 provided on the column members 4b, 4b side are provided with different distances from the connecting pin 23. Therefore, when the columns 3 and 3 are bent around the connecting pin 23 as shown in FIG. 3, the connection pipes 6 and 6 do not overlap each other and do not interfere with each other.

  FIG. 4 shows the state of FIG. 3 viewed from the side. Since the connecting pin 23 is provided at a position separated from the axial center of the column 3, that is, both column members 4 a and 4 b, in the back surface direction of the seat 2 (see FIG. 1), the column members 4 a and 4 b are The positions separated from each other can be maintained. Therefore, it is possible to prevent surrounding articles from being sandwiched between the support members 4a and 4b by bending the support 3.

  As can be seen from the figure, the connection pipes 6 and 6 are positioned so as to be shifted in the back surface direction of the seat 2 (see FIG. 1) with respect to the column 3 and are supported by the support portions 51 and 51. Yes. By doing so, even when the sheet 2 (see FIG. 1) bends in the back direction when stacked on the stretcher 1, it is possible to avoid contact with the connection pipes 6 and 6. Moreover, the support part 51 is made into the form protruded from the support | pillar 3 to the back surface direction of the sheet | seat 2 (refer FIG. 1), and functions also as a leg part at the time of putting on the floor surface etc. in the state which expand | deployed the support | pillars 3 and 3.

  Hereinafter, the configuration of the bent portion 3a of the support column 3 described above will be described in detail. FIG. 5 shows an enlarged view of the periphery of the bent portion 3a in the support column 3 in the unfolded state as shown in FIG. FIG. 6 is an exploded perspective view showing the part in an exploded manner, and the configuration will be described using FIG. 6 with reference to FIG.

  One strut member 4a which is a constituent element of the strut 3 is composed of a metal pipe portion 12 and a joint portion 14 connected thereto. The pipe part 12 is configured by fitting a short large-diameter pipe 12b on the outer periphery of the end part on the joint part 14 side based on the small-diameter pipe 12a. A connecting hole 12d is provided at the center in the axial direction of the large-diameter pipe so as to be orthogonal to the axis, and the connecting bolt 22 can be inserted. The large-diameter pipe 12b is provided for the purpose of reinforcement at the end, and as long as such a configuration can be configured, the pipe portion 12 is not divided into the small-diameter pipe 12a and the large-diameter pipe 12b but by means such as cutting. You may comprise as one.

  The joint portion 14 is mainly configured by bending a metal plate. The overlapping portion 14b, which is formed by parallel bending mainly in an inverted U-shape, projects over the overlapping portion 14b. It is comprised from the partial pipe-shaped pipe connection part 14a formed in this. The pipe connecting portion 14a has an outer peripheral surface having a curvature substantially equal to the inner diameter of the pipe portion 12. The pipe connecting portion 14a is connected to the stepped portion 14e serving as a boundary between the overlapping portion 14b and the pipe connecting portion 14a. It can be inserted into. Further, the upper portion 14i of the joint portion 14 is formed as a pipe-like external region having a curvature substantially equal to the outer diameter of the pipe portion 12, and when the pipe portion 12 is fitted into the pipe connecting portion 14a, the pipe portion 12 From the outer periphery to the surface of the joint part 14 is smoothly continued.

  Moreover, the pipe connection part 14a is provided with the connection hole 14c so as to be orthogonal to the axial center. The connection hole 14c is set so as to be in a position corresponding to the connection hole 12d provided in the pipe part 12 when the pipe part 12 is fitted into the outer periphery of the pipe connection part 14a. For this reason, the joint portion 14 and the pipe portion 12 are integrated by inserting the connecting bolt 22 at a position where both the connecting holes 14c and 12d overlap and screwing a nut (not shown) from the opposite side. ing. In this figure, in addition to the nut, a washer that is usually used simultaneously with a bolt and a nut and a spring washer are also omitted, but it is preferably used as appropriate. This also applies to the following.

  The pipe connecting portion 14a is formed in a direction parallel to the parallel surface of the overlapping portion 14b, and the overlapping portion 14b is folded and unfolded at a position where it is taken down from the pipe portion 12 attached to the pipe connecting portion 14a. A connecting hole 14d serving as a supporting point is provided in a direction orthogonal to the parallel plane. By setting the fulcrum (connecting hole 14d) in this way, the pipe portion 12 can rotate while maintaining a direction parallel to the parallel plane formed by the overlapping portion 14b.

  Further, the other strut member 4b, which is a constituent element of the strut 3, is also composed of a metal pipe portion 13 and a joint portion 15 connected thereto, similarly to the strut member 4a. The pipe portion 13a is formed opposite to the left and right sides of the pipe portion 12, and similarly, based on the small-diameter pipe 13a, a short large-diameter pipe 13b is fitted on the outer periphery of the end portion on the joint portion 15 side. It is composed.

  Similarly to the joint part 14, the joint part 15 is mainly composed of a bent metal plate, and a superposed part 15b in which two parallel surfaces are formed by bending mainly in an inverted U shape, and the superposed part 15b. It is composed of a partial pipe-shaped pipe connecting portion 15a formed so as to protrude to one side. After the pipe portion 13 is fitted on the outer periphery of the pipe connecting portion 15a, the connecting holes 22c and 13d provided on both sides are inserted and fastened with a connecting bolt 22 and a nut (not shown). It can be integrated.

  The overlapping portion 15b in the joint portion 15 is formed to be slightly smaller in overall shape so that it can be nested inside the overlapping portion 14b in the joint portion 14 described above. The joint portion 15 is also provided with a connecting hole 15d as a fulcrum for rotation so that the joint portion 15 is located at a position corresponding to the connecting hole 14d when it is substantially overlapped when viewed from the side. . By inserting a connecting pin 23 as a connecting tool at a position where both the connecting holes 14d and 15d overlap each other, and fixing the tip with a nut (not shown), the joint portion 14 with the connecting pin 23 as a rotation center. , 15 are rotatably connected.

  Since the fulcrum (connecting holes 14d and 15d) serving as the center of rotation is located at a position separated from the axial center of the pipe portions 12 and 13, as described above, both the strut members 4a including the joint portions 14 and 15 are provided. 4b can maintain a position separated from each other even in a bent state.

  Further, when the support members 4a and 4b are developed in a straight line by the rotation, the joint portion 15 operates and overlaps to enter the inside of the joint portion 14. Therefore, the upper part of the joint part 15 opposite to the pipe connection part 15a is rounded along the axial direction so that the inner surface of the joint part 14 can smoothly enter without being caught. Forming.

  Further, when the support members 4a and 4b are deployed in a straight line, the end surface 13c of the pipe portion 13 constituting a part of the end surface of the support member 15 and the joint portion 14 constituting a part of the end surface of the support member 14 are arranged. The end surface 14h is in contact with each other.

  Further, in the bent portion 3a configured as described above, both the support members 4a and 4b are in a straight line, and the pipe portions 12 and 13 are connected via a partial pipe-shaped external region 14i formed in the joint portion 14. Further, it is further provided with a fixing means 5 that locks the rotational operation in an apparently continuous state of one pipe and releases the locked state. The fixing means 5 includes a notch portion 15g as a first lock portion attached to the joint portion 15 on the support member 4b side, and a second lock portion attached to the joint portion 14 on the support member 4a side. The lock pin 21 which is a shaft portion of the main part is provided as a main element.

  The notch portion 15g as the first lock portion is a long hole extending in the axial direction of the pipe connecting portion 15a in the vicinity of the upper side of the edge portion of the joint portion 14 facing the column member 4a of the overlapping portion 15b. It is provided so as to form a part. An inclined surface 15e that is cut off obliquely is formed at the edge further above the cutout portion 15g. Further, an introduction portion 15h for facilitating the introduction of the lock pin 21 is formed at the edge below the notch portion 15g.

  The lock pin 21, which is the shaft portion as the second lock portion, is arranged in a direction orthogonal to the extending direction of the notch 15g and can be engaged and disengaged in the notch 15g. It is. In order to enable such an operation, the following mechanism is provided in the joint portion 14 on the column member 4 a side as a part of the fixing means 5.

  A movable body 24 is provided inside the joint portion 14 so as to extend from the inside of the pipe connecting portion 14a toward the inside of the overlapping portion 14b. The movable body 24 is formed by bending a metal plate so as to have the same width as the inner surface of the pipe connecting portion 14a. This width is larger than the inner width formed by the two surfaces of the overlapping portion 15b in the joint portion 15. small. Therefore, although the movable body 24 is provided inside the joint portion 14, the movable body 24 does not interfere with the joint portion 15 entering the inside of the joint portion 14 and does not hinder its operation.

  The end of the movable body 24 on the side of the pipe portion 12 forms a spring guide portion 14g as a projection having a small width. A coil spring 25 is attached to the outside so as to support the inner surface on one end side. The other end side of the coil spring 25 is supported by a spring contact portion 14g provided at an end portion of the pipe connecting portion 14g in the joint portion 14. The spring abutting portion 14g is formed so that a part of the metal plate constituting the pipe connecting portion 14g is folded back inside the pipe connecting portion 14g, and the inner surface of the coil spring 25 can be supported on the outside thereof. I have to.

  The movable body 24 configured as described above is incorporated into the joint portion 14, specifically, so as to exist from the inside of the pipe connecting portion 14 a toward the inside of the overlapping portion 14 b, and further, the column member 4 b is supported by the coil spring 25. It is elastically biased to the side.

  Furthermore, the movable body 24 is provided with a pin insertion hole 24a in a direction orthogonal to the axis of the pipe connecting portion 14a. The lock pin 21 can be operated together with the movable body 24 by inserting and supporting the lock pin 21 in the pin insertion hole 24a.

  The lock pin 21 is provided on both side surfaces of the overlapping portion 14b in the joint portion 14 so that both ends thereof protrude from a long-hole-shaped pin sliding hole 14f extending in the axial direction of the pipe connecting portion 14a. Yes. Therefore, when the movable body 24 is assembled, the lock pin 21 is inserted from the outside of the joint portion 14 after the pin sliding hole 14f and the pin insertion hole 24a of the movable body 24 are aligned. The lock pin 21 has the same shape as a general bolt, one end side is formed with a large diameter as a head, and a screw is formed on the other end side. The lock pin 21 is inserted from the pin sliding hole 21 and fixed with a nut or the like from the protruding tip.

  With this configuration, the movable body 24 and the lock pin 21 that is the shaft portion are elastically urged by the coil spring 25, while maintaining the state orthogonal to the axis of the pipe portion 12 along the pin sliding hole 14f. It is possible to advance and retract in the same direction as the axis. When the support members 4a and 4b are used in a straight line, the lock pin 21 is engaged so as to advance into the notch 15g and a locked state is formed. While the lock pin 21 is engaged and disengaged in the same linear direction as the shaft center, the support members 4a and 4b are intended to perform relative rotational motion, so that the action directions of both are different and the lock is effectively locked. The state can be maintained.

  Furthermore, the fixing means 5 includes a mechanism for releasing the locked state. Specifically, an operation lever 26 as an operation part to be subjected to the unlocking operation is provided inside the joint part 15, and the connection hole 26 a provided on the side surface below the base end part is provided with the above-described connection pin 23. Thus, the joint portions 14 and 15 are inserted simultaneously and fixed so as to be rotatable.

  A pressing portion 26b is formed on the upper side of the base end portion of the operation lever 26 so as to have a narrow width and protrude upward. This portion enters the inside of the distal end portion of the movable body 24 described above, and is locked. The pin 21 can be pushed in the axial direction against the elastic biasing force. In order to provide a release force against such an elastic urging force, the operation lever 26 is formed with a grip portion 26c as a handle portion protruding from the base end portion, and the end portion 26d is held by the grip portion 26c. By applying a rotational force so as to be close to the pipe portion 13, the pressing portion 26 b can come into contact with the lock pin 21 to apply a release force.

  When the gripping part 26 is assembled as shown in FIG. 5, the end part 26d side is pulled out from the joint part 15 from the base end part on the rotation center side, and the gripping part 26c goes to the end part 26d. , And are inclined so as to be separated from the pipe portion 13. When the unlocking operation is performed, the end portion 26d is rotated so as to be close to the pipe portion 13 side.

  Each part of the support | pillar members 4a and 4b comprised as mentioned above becomes a positional relationship like FIG. 5 at the time of normal use. At this time, the support members 4a and 4b are unfolded in a straight line on the left and right, and the form in which the pipe parts 12 and 13 are apparently continuous in a single pipe shape together with the partial pipe-shaped external region 4i formed in the joint part 14. Become. With this configuration, consideration is given so as not to impair the beauty.

  In this state, a lock pin that is a shaft portion as a second lock portion supported by the movable body 24 on the column member 4a side with respect to the notch portion 15g as the first lock portion formed on the column member 4b side. The locked state is formed by engaging 21. In this way, since the joint portions 14 and 15 are arranged so as to overlap each other and are locked between the two, the assembly and folding into the use state are possible as compared with the case where the pipes are directly locked. This improves the workability and improves the appearance because the engaging portion that is locked is not exposed to the outside.

  Further, in such a use state, as described above, the end surface 13c of the pipe portion 13 constituting a part of the end surface of the column member 15, and the end surface 14h of the joint portion 14 constituting a part of the end surface of the column member 14 Are in contact with each other. By doing so, the end faces 13c and 14h receive a load generated by the moment in the valley folding direction, that is, the M direction in the drawing, and generate a reaction force against the moment. The loads received by the end surfaces 13c and 14h act in a direction perpendicular to the end surfaces 13c and 14h, and act as simple compressive stresses in the axial direction on the pipe portion 13 and the joint portion 14, respectively. That is, a load is not applied to a bending direction with a low strength on a member formed in a thin plate shape as in the prior art, and a load can be applied only in a compression direction with a high strength even for a thin plate. Furthermore, since the portion that receives the load is not a point contact but a surface contact unlike the conventional case, the local stress generated on the contact surface can be reduced, and the deformation and damage of the member can be further suppressed. Can be done.

  FIG. 7 shows a storage state in which the support column 3 is bent from the state of FIG.

  The column member 4a and the column member 4b rotate relatively in the mountain fold direction around the connecting pin 23 so that the pipe portions 12 and 13 are parallel to each other. In such a storage state, since the lock is not applied, the pipe portions 12 and 13 are not necessarily parallel. Further, depending on the dimensional adjustment of each portion, 180 ° or more from the time of use or 180 °. It is also possible to bend the following.

  As described above, since the position of the lock pin 23 serving as a fulcrum for the rotation of each column member 4a, 4b is located away from the axis of each column member 4a, 4b, In addition, a gap can be maintained between the pipe portions 12 and 13.

  FIG. 8 shows the way in which the support members 4a and 4b are developed from the state of FIG. This figure shows a state in which the joint portion 15 of the column member 4b gradually enters so as to overlap the joint portion 14 of the column member 4a, up to the notch 15g formed in the joint portion 15. Has entered the inner surface of the joint portion 14.

  The joint portion 15 has an inclined portion 15e and a rounded portion 15f formed at the upper end of the tip, and these portions function as escapes to avoid interference when the joint portion 15 enters the inside of the joint portion 14. It is possible to easily enter the inside of the joint portion 14.

  Further, the operation lever 26 is also rotated along with the rotational movement of the support member 4b.

  FIG. 8 shows a state in which the support members 4a and 4b are further expanded from FIG.

  As the joint portion 15 enters the inside of the joint portion 14, the lock pin 21 is pushed together with the movable body 24 along the pin sliding hole 14 f by the introduction portion 15 h formed at the edge of the joint portion 15. At the same time, the coil spring 25 for applying an elastic biasing force is contracted.

  Further, when the support members 4a and 4b are developed and straightened, the state shown in FIG. 5 is obtained. In this state, the pin sliding hole 14f for supporting the lock pin 21 and the position of the notch 15g are matched, so that the lock pin 21 is automatically pushed into the notch 15g by the action of the coil spring 25 and engaged. Lock state occurs.

  In this locked state, since the rotation direction of the column members 4a and 4b and the engagement / disengagement direction of the lock pin 21 are different, the locked state is not released unless the following releasing operation is performed.

  FIG. 10 shows a time when the operation lever 26 is operated to release the locked state. By rotating the operation lever end portion 26d so as to be close to the column member 4b, the pressing portion 26b formed on the upper end portion of the operation lever 26 by rotating the connection pin 23 as a fulcrum pin-slids the lock pin 21. It pushes to the support | pillar member 4a side along the moving hole 14f. By doing so, the engagement between the lock pin 21 and the notch 15g is released, and the column members 4a and 4b can be freely rotated as shown in FIGS.

  Moreover, the stretcher 1 in this embodiment has a function for contracting in the width direction as shown in FIG. Hereinafter, the configuration for this will be specifically described with reference to FIG.

  As described above, between the support members 4b and 4b (4a and 4a), the connection pipes 6 and 6 are provided via the support portions 51 and 51 provided at both ends so as to be parallel to each other while maintaining a predetermined interval. It is configured. The connection pipe 6 has a configuration in which the connection pipe members 6a and 6b are connected via the bent portion 6c, and the connection pipe members 6a and 6b are based on the connecting pin 52 provided on the bent portion 6c. It is configured to be capable of relative rotation. Further, each of the connection pipe members 6a and 6b is connected to a support portion 51 fixed to the support columns 3 and 3 by connecting pins 54 and 54 so as to be rotatable therearound. Further, the bent portion 6c includes a fixing means 7 that can be locked in a state where the connection pipe members 6a and 6b are substantially in a straight line and can be released from the locked state.

  A detailed configuration of the fixing means 7 will be described below based on the partial cross-sectional view shown in FIG. 11 with reference to FIG.

  First, the fixing means 7 includes a lock storage portion 61 having a U-shaped cross section formed by bending a metal plate. One connecting pipe portion 6 a is fixed to and integrated with the lock storage portion 61 by two fixing pins 55. The other connecting pipe portion 6b is connected to the lock storage portion 61 by a single connecting pin 52 so as to be rotatable about the connecting pin 52 as a fulcrum.

  Further, a lock member 63 that is slidable in the axial direction of the connection pipe portion 6 a is provided inside the lock storage portion 61. The lock member 63 is provided with an elastic biasing force in the axial direction of the connection pipe portion 6a by providing a coil spring 64 between the lock member 63 and a wall-like spring contact surface 61a provided in the lock storage portion 61. Yes. Further, the lock storage portion 61 is provided with a wall-like lock member contact surface 61b so as to face the spring contact surface 61a, and the lock member contact surface 61 regulates the movement of the lock member 63. The lock member 63 functions as a stopper, and the lock member 63 can move between the lock member contact surface 61 and the spring contact surface 61a while being elastically biased toward the distal end of the connection pipe portion 6a by the coil spring 64. it can.

  Further, the lock member 63 is formed with a stepped portion 63a and an inclined surface 63b. The stepped portion 63a is cut out to form a surface that is perpendicular to the axial direction of the connecting pipe portion 6a. The inclined surface 63b is connected to the stepped portion 63a and is formed as a flat surface inclined with respect to the axial direction of the connection pipe 6a.

  The step part 63a formed in this way can come into contact with the end surface 71 of the connection pipe 6b. The inclined surface 63b comes into contact with the contact portion 72 on the lock member 63 side which is a part of the outer periphery of the connection pipe portion 6b.

  Therefore, when the connection pipe portions 6a and 6b are rotated in the direction of folding, that is, in the direction of the arrow in the figure, the contact portion 72 is restricted from rotating by the inclined surface 63d, so that the connection pipe portions 6a and 6b There is a lock in between.

  Moreover, the end surface 71 of the connection pipe part 6b is formed so that it may incline rather than the surface perpendicular | vertical with respect to an axial center, and the said contact part 72 side may become long. In this way, when the connecting pipe portions 6a and 6b are rotated from the folded state to the expanded state, the end surface 71 comes into contact with the end surface 63c of the lock member 63 so as to be locked. When the member 63 is gradually pushed in against the elastic biasing force of the coil spring 64, and the connection pipe portions 6a and 6b are eventually straightened, the end surface 71 is separated from the end surface 63c and abuts against the stepped portion 63a to be locked. A state is automatically formed.

  In addition, in order to release such a locked state, a part of the lock member 63 is projected to the outside of the lock housing part 61, and the operation lever 62 is fixed and integrated with the part. By operating the operation lever 62 from the outside, the lock member 63 can be moved against the elastic biasing force of the coil spring 64. By doing so, the inclined surface 63b of the lock member 63 is largely separated from the abutting portion 72 of the connection pipe portion 6b, and the connection pipe portion 6b can be rotated around the connecting pin 52. The state can be released.

  By releasing the locked state as described above, the connection pipe portions 6a and 6b can be folded inward by the bent portion 6c as shown in FIG. At this time, since the connection pipe portions 6a and 6b are rotatably supported by the support portions 51 and 51 with the connecting pin 54 as a fulcrum, the column members 4b and 4b (4a and 4a) are maintained in a parallel state. However, both can be brought close to each other.

  The stretcher 1 configured as described above is used as follows.

  Usually, the stretcher 1 is stored in the most compact folded form as shown in FIGS. At this time, the stretcher 1 is in a state in which the connection pipes 6a and 6b are folded inward to be contracted in the width direction, and the other support members 4b and 4b are attached to the support members 4a and 4a. They are folded in the longitudinal direction so as to be parallel.

  From this state, the operator first unfolds the other column members 4b and 4b by rotating the other column members 4b and 4b around the fulcrum 23 with respect to the one column members 4a and 4a. As shown in FIG. 3, the support members 4a and 4b are aligned with the support members 4a and 4a, so that the support member 4a is placed inside the notch 15g provided on the support member 4b side as shown in FIG. The lock pin 21 provided on the side automatically enters and engages to form a locked state, which makes it impossible to fold.

  Further, from this state, the operator extends the connecting pipes 6 and 6 connected between the columns 3 and 3 from the bent state, and the columns 3 and 3 are separated and opened in the width direction as shown in FIG. And At this time, the contact side pipes 6a and 6b constituting the connection pipes 6 and 6 are in a straight line, so that the locked state by the fixing means 7 is automatically formed and the folding is impossible.

  In this way, the operator can automatically form the locked state in both the longitudinal direction and the width direction simply by unfolding the support columns 3 and 3 and the connecting pipes 6 and 6, and can be used more quickly than when the stretcher 1 is folded. Can be changed.

  Further, since each end surface of the column members 4a and 4b abuts against a moment in the valley fold direction generated when loading on the stretcher 1 and acts as a load perpendicular to the end surface, each member has high strength. Since the load can be applied only in the direction and the local stress can be reduced as the surface contact, deformation and damage of the member due to loading can be suppressed. Therefore, it can be used satisfactorily for a long time.

  As described above, the stretcher 1 of the present invention is a stretcher 1 in which the seat 2 is stretched over a pair of struts 3, 3. Each strut 3, 3 has two strut members 4 a, 4 b and both struts A connecting device 23 for connecting the members 4a and 4b so as to be bendable, and fixing means 5 for fixing the support members 4a and 4b in a state where the axes of the support members 4a and 4b are substantially straight; The connecting tool 23 is such that the end surfaces 14h and 13c of the two column members 4a and 4b are closely or closely opposed to each other and the end surfaces 14h and 13c are separated from each other, and both column members 4a and 4b are bent in a mountain fold. These are connected so as to be relatively rotatable around a fulcrum set at a position spaced from the axial center of both column members 4a, 4b between the folding position, and the fixing means 5 includes both the column members 4a, 4b. In between When both the column members 4a and 4b are rotated to the use position, the column member is shifted to a locked state for restricting the reverse rotation, and the locked state is released by an operation applied to a part of the fixing means 5. is there.

  Since it is configured in this manner, the end faces 14h and 13c face each other and shift to the locked state simply by changing the column members 4a and 4b from the mountain-folded state to the linear state. Since it can be folded, the operability is improved. Furthermore, since the fulcrum 23 where the support members 4a and 4b rotate is located away from the shaft center, a certain distance is secured between the support members 4a and 4b which are folded in a mountain, and the possibility of sandwiching surrounding articles can be reduced. .

  Further, when a moment in the valley fold direction acts on the support members 4a and 4b at the use position, the end surfaces 14h and 13c come into contact with each other to support the load generated by the moment 2. Therefore, the load generated during use can be received by the end surfaces 14h and 13c of the support members 4a and 4b, and deformation and damage of the support members 4a and 4b can be suppressed.

  Further, the fixing means 5 is attached to one of the support members 4b, the first lock portion 15g entering the inside of the other support member 4a as the both support members 4a and 4b approach the use position, A second lock portion 21 which is attached to the support column member 4a and engages with the first lock portion 15g entered at the use position of the support column members 4a and 4b to hold the support column members 4a and 4b at the use position; Since both the lock portions 15g and 21 are engaged and disengaged inside the column members 4a and 4b, the possibility of sandwiching surrounding articles between them can be reduced.

  The support members 4a and 4b are integrally provided at the ends of the pipe portions 12 and 13 and the pipe portions 12 and 13, and fulcrums 14d and 15d are set at positions where they are taken out from the pipe portions 12 and 13. Joint portions 14 and 15, and both the joint portions 14 and 15 are rotatably connected by the connecting tool 23 at the fulcrums 14 d and 15 d, and one joint portion 15 enters the other joint portion 14. Since the first lock portion 15g provided on one joint portion 15 is configured to engage with the second lock portion 21 provided on the other, the one joint portion 15 is located inside the other joint portion 14. Since the lock mechanism 5 may be configured such that the first lock portion 15g and the second lock portion 21 are engaged with each other at the position where the pipe portions 12 and 13 are directly engaged with each other. Assembly to use condition Together with the workability according to the folding is improved, appearance is improved because no appear in appearance.

  In addition, at the use position, the end surface 13c of the pipe portion 13 constituting the one strut member 4b and the end surface 14h of the joint portion 14 constituting the other strut member 4a are opposed to each other. A partial pipe-shaped outer region 14i is provided in a part, and in the outer region 14i, the pipe portion 13 of one strut member 4b and the pipe portion 12 of the other strut member 4a seem to be continuous in one pipe shape. Therefore, it is possible to effectively secure a portion where the end faces 13c and 14h come into contact with each other, and to effectively adjust the appearance.

  One of the first lock portion and the second lock portion has a notch 15g at the edge of the joint portion 15, and the other extends in a direction perpendicular to the axis of the column member 4a. The shaft portion 21 is elastically biased, and the edge portion 15h around the notch portion 15g pushes the shaft portion 21 against the elastic force in accordance with the rotation toward the use position between the support members 4a and 4b. When it reaches the use position, the shaft portion 21 engages with the notch portion 15g along a direction different from the rotation direction of the two column members 4a and 4b by elastic force, and the shaft portion 21 is notched by the unlocking operation. Since it is configured to be disengaged from 15g, once engaged, the disengagement direction of the shaft portion 21 with respect to the notch portion 15g is different from the rotation direction of both support members 4a and 4b, so the operation portion 26 is not operated. As long as locked It will not be released.

  Further, the operation portion 26 to be subjected to the unlocking operation has a base end 26a rotatably attached around the fulcrum 15d inside the joint portion 15, and pulls the end portion 26d out of the joint portion 15 to provide one support column. The operation lever 26 is extended in a direction inclined with respect to the pipe portion 13 of the member 4b, and the operation lever 26 is operated in a direction in which the end portion 26d is close to the pipe portion 13, so that a part of the base end Since the second lock portion 21 is biased in the direction to release the engagement at 26b, a mechanism for releasing the lock can be compactly incorporated inside the fixing means 5, and the lock release can be performed. The operability is also improved.

  The specific configuration of each unit is not limited to the above-described embodiment.

  For example, in the above-described embodiment, joint portions 14 and 15 that overlap each other are provided at the end portions of the column members 4a and 4b, and the first lock portion is provided on the inner joint portion 15 side of these joint portions 14 and 15. 15g and a lock pin 21 serving as a second lock portion on the outer joint portion 14 side. However, as long as the two can be engaged, the notch 15g and the lock pin are provided. It is also possible to provide 21 on either side. At this time, as long as the lock pin can be moved in a direction against the urging direction of the lock pin 21, the operation lever 26 may be provided on the column members 4 a and 4 b on either side.

  Other configurations can be variously modified without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Stretcher 2 ... Sheet | seat 3 ... Column 4a, 4b ... Column member 5 ... Fixing means 6 ... Connection pipe 12, 13 ... Pipe part 13c ... End surface 14 ... Joint part 14d ... Connection hole (fulcrum)
14h ... End face 14i ... (Partial pipe shape) External region 15 ... Joint part 15d ... Connection hole (fulcrum)
15g ... Notch (first lock)
21 ... Lock pin (shaft part) (second lock part)
23 ... Connecting pin (connector)
26. Operation lever (operation part)

Claims (7)

In a stretcher with a sheet spanned between a pair of struts,
Each of the columns includes two column members, a coupling that connects both column members so that the columns can be bent, and a fixing unit that fixes the column members in a state where the axis of the column members is substantially straight. And
The coupling tool has an axial center between both strut members between a use position in which the end surfaces of both strut members are closely or closely opposed and a folding position in which the end surfaces are separated and the both strut members are folded in a mountain fold. These are connected around a fulcrum set at a separated position so that they can rotate relative to each other.
The fixing means is provided between both strut members, shifts to a locked state that restricts reverse rotation when the both strut members rotate to the use position, and is operated by an operation applied to a part of the fixing means. all SANYO to release the lock state,
The operation part to be subjected to the unlocking operation is formed as an operation lever whose base end is rotatably attached around the fulcrum and whose end extends along one column member. by operating in the direction in which said end portion is close to the post member of the one, litter, characterized that you unlock state. 2. The stretcher according to claim 1, wherein when a moment in a valley folding direction acts on the two support members at a use position, their end faces come into contact with each other to support a load generated by the moment. The fixing means is attached to one of the support members, and both the support members are attached to the first support member and the other support member as the both support members approach the use position. The stretcher of Claim 1 or 2 provided with the 2nd lock part which engages with the said 1st lock part which approached in the use position of a support | pillar member, and hold | maintains both support | pillar members in a use position. Each strut member has a pipe part and a joint part integrally provided at the end part of the pipe part and having a fulcrum set at a position taken out from the pipe part, and both joint parts are connected at the fulcrum. And a first lock portion provided in one of the joint portions engages with a second lock portion provided in the other. The stretcher according to 3. In the use position, the end surface of the pipe part that constitutes one strut member and the end face of the joint part that constitutes the other strut member are configured to face each other, and a partial pipe-shaped external region is formed in a part of the joint part. The stretcher according to claim 4, wherein the pipe portion of one strut member and the pipe portion of the other strut member are apparently continuous in a single pipe shape in the outer region. One of the first lock portion and the second lock portion has a notch at the edge of the joint portion, and the other extends in a direction perpendicular to the axis of the column member and is elastically biased to one of the axis directions. As the shaft part has a shaft part and the support member rotates toward the use position, the edge part around the notch part pushes the shaft part against the elastic force, and when it reaches the use position, the shaft part is caused by the elastic force. 6 is configured to engage with the cutout portion along a direction different from the rotation direction of both support members, and to disengage the shaft portion from the cutout portion by an unlocking operation. The stretcher described in. The operation part to be subjected to the unlocking operation is attached so that the base end is rotatable around the fulcrum inside the joint part, and the end part is pulled out from the joint part and inclined with respect to the pipe part of one of the support members. It is formed as an operation lever extended in the direction, and by operating the operation lever in a direction in which the end portion is close to the pipe portion, a part of the base end of the first lock portion or the second lock portion is formed. The stretcher according to claim 4 or 5, wherein one of the stretchers is biased in a direction of releasing the engagement.

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