Sheet tensioning device

Abstract

To provide a sheet tensioning device capable of reducing the labor required when tucking and tensioning a sheet on the underside of a mattress, and applicable regardless of the size of a bed frame.SOLUTION: A sheet tensioning device 10 according to the present invention is the sheet tensioning device for tensioning a sheet, which has a plurality of hook portions arranged along at least one pair of edges, onto a mattress formed in a substantially rectangular parallelepiped shape. The sheet tensioning device comprises a plurality of tensioning units arranged to face each other at two pairs of opposing edge portions of a bed frame, and support members arranged between the tensioning units to support the mattress at a predetermined height. At least one of the tensioning units arranged to face each other is mounted on a base unit such that a tray is capable of reciprocating movement in a direction perpendicular to the opposing sides of the bed frame, below the position where the support members support the mattress. An engagement / disengagement member follows the tray.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a sheet-stretching device, and more particularly to a technique for easily changing sheets when making a bed. [Background technology]

[0002] For example, in hotels and nursing homes, there are many beds for users to sleep in, and sheets are placed on the beds to cover the mattresses. Every time the bed is used, the sheets are removed and new, clean sheets are placed.

[0003] A sheet is made of a piece of cloth material in a substantially rectangular shape that is larger than the mattress. In order to stretch the sheet so as to wrap around a mattress in a substantially rectangular shape, the sheet is first placed on the mattress in an unfolded state, and then the mattress is partially lifted up, and the end of the sheet is folded over the back side of the lifted mattress. The operation of folding the end of the sheet over the back side of the mattress requires inserting a hand under the mattress and reaching toward the center of the mattress to pull the end of the sheet. Then, the folded sheet is pulled evenly under the mattress toward the center to adjust it so that no wrinkles are formed. In order to install a single sheet, such an operation must be performed on all four sides of the mattress, and it takes a lot of effort to install the sheet neatly and without wrinkles. Moreover, the number of beds installed in hotels and nursing homes is enormous, and it is a heavy burden to change the sheets of all the beds with limited manpower.

[0004] Therefore, technologies have been proposed to reduce the labor involved in changing sheets.For example, the technology described in Patent Document 1 involves hooking a sheet-pulling hook onto a number of loops provided along the edge of the sheet, and then turning a handle for driving the sheet-pulling hook to move the hook downward to set the sheet (Patent Document 1).

[0005] In addition, the technology described in Patent Document 2 involves hooking belt fasteners at both ends of a belt with length adjustment function onto sheet fasteners provided on multiple edges of opposing sides of the sheet, and shortening the length of the belt while wrapping the belt around the bottom of the mattress, thereby pulling the opposing sheet fasteners against each other and applying the sheet without wrinkles (Patent Document 2).

[0006] While the techniques disclosed in Patent Documents 1 and 2 allow the sheet to be installed with relatively little effort, they only allow the edges of the sheet to be pulled downward and cannot be tucked under the mattress, which results in an unattractive appearance.

[0007] In other words, in order to lay the sheet out in a way that looks good, it is necessary to fold the edges of the sheet over the underside of the mattress, but with the technology disclosed in Patent Documents 1 and 2 above, the edges of the sheet hang down from the sides and front and back of the mattress, making it impossible to lay the sheet out in a beautiful way.

[0008] Furthermore, particularly in hotels and other accommodation facilities, there are multiple sizes of bed frames depending on the type of room, even in the same facility, and there is a problem in that it is costly to prepare equipment suitable for each different size bed frame. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 2922464 [Patent Document 2] JP 2001-292882 A Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been made in consideration of these problems, and aims to provide a sheet-stretching device that can reduce the effort required when folding and stretching a sheet on the underside of a mattress, and that can be used regardless of the size of the bed frame. [Means for solving the problem]

[0011] The inventors of the present invention discovered that by installing a transport mechanism on the underside of the mattress that can move back and forth parallel to specific opposing sides of the bed frame, it is possible to fold the ends of the sheet onto the underside of the mattress without effort, and thus arrived at the present invention.

[0012] The present invention provides the following solutions.

[0013] The sheet-stretching device according to a first feature is a sheet-stretching device that stretches a sheet that is formed in a roughly rectangular shape having two pairs of opposing sides and has a plurality of hook portions arranged along the edges of at least one of the two pairs of opposing sides, onto a mattress that is formed in a roughly rectangular shape.

[0014] The sheet-stretching device is composed of a plurality of stretching units arranged to face each other on two sets of opposing edges of the bed frame, and a support member arranged between the stretching units to support the mattress at a predetermined height.

[0015] Each of the tensioning units includes a base unit that is formed in a roughly rectangular shape when viewed from above and is placed on the bed frame, a tray that is installed on the base unit, and a hanging member that is housed in the tray and has a hanging portion that can be hung and detached from the hook portion.

[0016] At least one of the tensioning units arranged to face each other is mounted on the base unit so that the tray can move back and forth in a direction perpendicular to the opposing sides of the bed frame below the position where the support member supports the mattress, and the hanging / detaching member moves following the tray.

[0017] According to the first aspect of the invention, a sheet stretching device is composed of a plurality of stretching units arranged opposite each other and a support member arranged between the plurality of stretching units and supporting the mattress at a predetermined height. Therefore, by appropriately arranging the plurality of stretching units on the bed frame, a sheet stretching device can be provided that can stretch sheets in directions perpendicular to each of the long and short sides of the bed, regardless of the size of the bed.

[0018] In addition, since each stretching unit is formed by a unit having a base unit, a tray, and a hanging / detaching member, by preparing multiple stretching units, it is possible to provide a sheet-stretching device that can be used for beds of various sizes.

[0019] Moreover, because the base unit that plays a role in supporting the tensioning unit is formed separately from the support member that supports the mattress, it is only necessary to change the size of the support member to accommodate slight differences in the size of the bed frame or mattress, and bed frames of different sizes can be accommodated without changing the size of the tensioning unit including the base unit. In other words, because the tensioning unit is not involved in supporting the mattress, even if there are differences in the size of the bed frame or mattress, there is no need to change the size of the tensioning unit itself, and a tensioning unit of a given size can be used to accommodate beds of various sizes, making mass production easier and leading to cost reduction.

[0020] Furthermore, at least one of the opposing tensioning units is mounted on the base unit below the position where the support member supports the mattress so that the tray can move back and forth in a direction perpendicular to the opposing sides of the bed frame, and since the hooking member follows the tray, by simply pushing the tray toward the center of the mattress with the hooking part hooked onto the sheet hook, the end of the sheet can be easily folded toward the underside of the mattress, and the sheet can be tensioned over the mattress without effort and wrinkles.

[0021] The invention relating to the second feature is the invention relating to the first feature, wherein the tray has a roughly square-shaped storage section for storing the hanging member, and a fall-out prevention section at the end of the storage section for preventing the stored hanging member from falling out, and the hanging member is composed of a plate section equipped with a hanging section that can be hung and detached from the hook section.

[0022] According to the second feature of the invention, the tray has a roughly square-shaped storage section for storing the hanging member, and a retaining section at the end of the storage section for preventing the stored hanging member from falling out, and the hanging member is composed of a plate section with a hanging part that can be detached from the hooking part, so that the hanging member can be removed from the tray as needed. Therefore, the hanging part of the hanging member removed from the tray can be easily hooked onto the hooking part provided at the end of the sheet, making the tensioning work easier. Also, by positioning the hanging member below the retaining section with the hanging part hooked onto the hooking part, the hanging member can be tensioned while being prevented from falling out of the tray.

[0023] The third feature of the invention is the first or second feature of the invention, wherein the tray is capable of reciprocating in a direction perpendicular to a pair of opposing sides by a rail portion provided on the base unit.

[0024] According to the third feature of the invention, the tray can be moved back and forth in a direction perpendicular to a pair of opposing sides using guides or rails provided on the base unit, so that a mechanism capable of reciprocating movement can be constructed without using a complex mechanism.

[0025] The fourth feature of the invention is the third feature of the invention, further comprising a locking mechanism for restricting movement of the tray.

[0026] According to the fourth feature of the invention, a locking mechanism is further provided to restrict movement of the tray, so that the tray can be moved to a desired position, tension is applied, and then the desired position can be maintained.

[0027] The fifth feature of the invention is the fourth feature of the invention, in which the hooking / detaching portion is formed by a plurality of hook-shaped members.

[0028] According to the fifth feature of the invention, the hook-and-loop portion is composed of a plurality of hook-shaped members, so that by simply moving one tray, the end of the sheet within a predetermined range can be pulled, thereby saving the effort required to tension the sheet. Effect of the Invention

[0029] According to the present invention, it is possible to reduce the labor required to fold and stretch a sheet over the underside of a mattress, and it is also possible to provide a sheet-stretching device that can be used regardless of the size of the bed frame. [Brief description of the drawings]

[0030] [Figure 1] Fig. 1 is a schematic diagram showing the overall configuration of a sheet 20 which is an object to be stretched by a sheet stretching device 10 according to this embodiment. Fig. 1(a) is a plan view of the entire sheet 20, and Fig. 1(b) is a partially enlarged view. [Diagram 2] FIG. 2 is a schematic diagram showing in a simplified manner the overall configuration of the sheet-stretching device 10 according to this embodiment, where FIG. 2(a) is a perspective view and FIG. 2(b) is a plan view. [Diagram 3] FIG. 3 is an exploded perspective view of the sheet-stretching device 10 according to this embodiment, with FIG. 3(a) showing a perspective view and FIG. 3(b) showing a plan view. [Figure 4] FIG. 4 is a schematic diagram for explaining the extension unit 100 that can reciprocate in a direction perpendicular to the sides of the bed frame 30, FIG. 4(a) is a perspective view, and FIG. 4(b) is a plan view. [Diagram 5] FIG. 5 is a schematic diagram showing details of a hanging member 130 constituting the tensioning unit 100, FIG. 5(a) being a perspective view, and FIG. 5(b) being a plan view. [Figure 6] FIG. 6 is a schematic diagram showing a tensioning unit 100 of a fixed structure that does not reciprocate, among the tensioning units 100 according to this embodiment. [Figure 7]FIG. 7 is a schematic diagram showing the procedure for spreading the sheet 20, which is the target to be stretched by the sheet stretching device 10 according to this embodiment, over the mattress 40. [Figure 8] FIG. 8 is a schematic diagram showing a procedure for attaching the hanging member 130 to the sheet 20. As shown in FIG. [Figure 9] FIG. 9 is a schematic diagram showing a state in which a sheet 20 is stretched using the sheet-stretching device 10 according to this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that this is merely an example, and the technical scope of the present invention is not limited to this example.

[0032] [Overall configuration of the sheet stretching device 10] The overall configuration of the sheet-stretching device 10 according to this embodiment and the sheet 20 to be stretched will be described with reference to Figs. 1 to 3. Fig. 1 is a schematic diagram showing the overall configuration of the sheet 20 to be stretched by the sheet-stretching device 10 according to this embodiment. Fig. 1(a) shows a plan view of the entire sheet 20, and Fig. 1(b) shows an enlarged partial view. Fig. 2 is a schematic diagram showing the overall configuration of the sheet-stretching device 10 according to this embodiment in a simplified manner. Fig. 2(a) shows a perspective view, and Fig. 2(b) shows a plan view. Fig. 3 is an exploded perspective view of the sheet-stretching device 10 according to this embodiment. In this embodiment, the upper side refers to the upper side in the direction of gravity, and the lower side refers to the lower side in the direction of gravity. In addition, the surface of the mattress 40 described later refers to the surface on which the user sits when used for sleeping, and the back side of the mattress 40 refers to the surface on the bed frame 30 side.

[0033] The sheet-stretching device 10 of this embodiment stretches the sheet 20, which is formed in a substantially rectangular shape having two pairs of opposing sides (short sides 21a and long sides 21b) as shown in Fig. 1 and has a plurality of hooks 22 arranged along the edges of at least one of the two pairs of opposing sides (short sides 21a and long sides 21b) for pulling the sides 21a, 21b in a direction substantially perpendicular to the sides 21a, 21b, without wrinkles, around a mattress 40 formed in a substantially rectangular parallelepiped shape and placed above a bed frame 30. The state shown in Fig. 2 is the state before the mattress 40 is placed on the support member 200 of the sheet-stretching device 10.

[0034] Before describing the tensioning device 10 of this embodiment, a sheet 20 to be tensioned by the sheet tensioning device 10 will be described with reference to Fig. 1. The sheet 20 has a sheet body 21 formed in a substantially rectangular shape having opposing short sides 21a and long sides 21b, and a plurality of hooking parts 22 for pulling the sides 21a, 21b of the sheet body 21 in a direction substantially perpendicular to the sides 21a, 21b are formed along the edge. As shown in Fig. 1(b), the hooking parts 22 on the short side 21a of the sheet body 21 are formed by uniformly forming sewn parts 23t at a first predetermined interval T1, which are sewn in a direction perpendicular to the edge, on a string-like member 23 having a predetermined width arranged along the edge of the short side 21a, to generate a plurality of loops. Similarly, multiple loops are generated by uniformly forming sewn portions 23t at second predetermined intervals T2 on string-like members 23 having a predetermined width arranged along the edge of long side 21b. In this embodiment, the multiple hook portions 22 are formed by sewing string-like members 23 to the fabric of sheet 20 at predetermined intervals, but the means for forming hook portions 22 is not limited to this. For example, multiple short string-like members having both ends sewn to the fabric of sheet 20 may be provided along the edge of the side.

[0035] The overall configuration of the sheet-stretching device 10 of this embodiment will be described with reference to Figures 2 and 3. As shown in Figure 2, the sheet-stretching device 10 is composed of multiple stretching units 100 arranged to face each other on two sets of opposing edges of a bed frame 30, and a support member 200 arranged between the multiple stretching units 100 on the bed frame 30 and supporting the mattress 40 at a predetermined height.

[0036] The tensioning units 100 are arranged to face each other at two sets of opposing edge portions of the bed frame 30, and at least one of the pair of tensioning units 100 arranged to face each other is configured to be able to reciprocate in a direction perpendicular to the side of the bed frame 30, and can pull the edge of the sheet 20 toward the center of the bed frame 30. For example, in the example shown in FIG. 2, one of a pair of tensioning units 100 facing each other and arranged near the long side of the bed frame 30 can pull the edge of the sheet 20, while the other only holds the edge of the sheet 20. Also, of a pair of tensioning units 100 facing each other and arranged near the short side of the bed frame 30, the foot-side tensioning unit 100 can pull the edge of the sheet 20, but the head-side tensioning unit 100 only holds the edge of the sheet 20. Thus, in the example shown in Figure 2, one of a pair of tensioning units 100 arranged opposite each other has a structure capable of reciprocating motion, and the other tensioning unit 100 has a fixed structure, but both of the pair of tensioning units 100 arranged opposite each other may have a structure capable of reciprocating motion.

[0037] The support member 200 is installed on the top surface of the bed frame 30 between the bed frame 30 and the mattress 40, and is processed into an appropriate planar shape. The support member 200 is a member that supports the mattress 40, and has a predetermined height higher than the position at which the slide unit 120 reciprocates in the tensioning unit 100 described later so that the slide unit 120 can reciprocate. For example, in this embodiment, the height of the support member 200 is 45 mm, and the height of the tensioning unit 100 is 40 mm. Also, as shown in FIG. 3, the support member 200 is composed of a support 210 formed of a material with cushioning properties capable of supporting the mattress 40, such as polystyrene foam or honeycomb, and a cover body 220 that covers the surface of the support 210, and a groove corresponding to the rail part 112 of the tensioning unit 100 described later is formed in the support 210.

[0038] [Configuration of tensioning unit 100] Next, the tensioning unit 100 having a structure capable of pulling the edge of the sheet 20 will be described with reference to Figs. 4 and 5.

[0039] Fig. 4 is a schematic diagram illustrating the tensioning unit 100 that can reciprocate in a direction perpendicular to the side of the bed frame 30. Fig. 4(a) shows a perspective view, and Fig. 4(b) shows a plan view. Fig. 5 is a schematic diagram showing the details of the hanging member 130 that constitutes the tensioning unit 100. Fig. 5(a) shows a perspective view, and Fig. 5(b) shows a plan view.

[0040] Each tensioning unit 100 has a base unit 110 formed by a frame-shaped body that is approximately rectangular in plan view and supports a slide unit 120 so that it can move back and forth, the slide unit 120 connected to the base unit 110 so that it can move back and forth in a direction perpendicular to the opposing sides of the bed frame 30, and a hanging member 130 equipped with a hanging portion 131 that can be hung and detached from the hook portion 22 of the sheet 20.

[0041] The base unit 110 is provided with a frame-shaped base portion 111 which is formed in a roughly rectangular shape when viewed from above and is elongated in a direction parallel to the edge on which it is installed, and which is placed on the bed frame 30, a rail portion 112 for the reciprocating movement of the slide unit 120 described later, and a locking mechanism 113 which regulates the movement of the slide unit 120.

[0042] The base 111 is a member placed on the top surface of the bed frame 30, and is formed of a frame-like member having a generally rectangular shape in a plan view. A rail portion 112 is fixed to the base 111 to support the slide unit 120 so that the slide unit 120 can reciprocate.

[0043] The rail portion 112 is a rod-shaped member fixed to the base portion 111, and is extended so as to face in a direction perpendicular to the side of the bed frame 30 when the extension unit 100 is placed on the edge of the bed frame 30.

[0044] The locking mechanism 113 positions the slide unit 120 that has been moved to an appropriate position so that it does not move unexpectedly, and is composed of a pressing member that can reciprocate in a direction perpendicular to the direction in which the slide unit 120 reciprocates. The pressing member has an uneven portion that can engage with an uneven portion formed in the engagement portion 124 described later, and restricts the movement of the slide unit 120 by pressing the pressing member while the uneven portion of the locking mechanism 113 and the uneven portion of the engagement portion 124 are engaged. Note that the locking mechanism 113 may be any mechanism that can prevent unexpected movement of the slide unit 120, and may be any mechanism other than an uneven portion, such as a clamping mechanism or a pressing mechanism.

[0045] Next, a description will be given of the slide unit 120. The slide unit 120 includes a tray 121 that houses the hanging member 130, a retaining portion 122 that prevents the hanging member 130 from falling off the tray 121, a guide portion 123 that is slidably connected to the rail portion 112 of the base unit 110, and an engagement portion 124 that cooperates with a lock mechanism 113 of the base unit 110 to regulate the movement of the slide unit 120.

[0046] The tray 121 is a frame-like member formed in a generally rectangular shape in a plan view elongated in a direction parallel to the edge to be installed, below the position where the support member 200 supports the mattress 40, and capable of reciprocating in a direction perpendicular to the side of the bed frame 30. The tray 121 according to this embodiment has a storage section 121a capable of storing the hanging / detaching member 130 inside the member formed in a frame shape.

[0047] The retaining portion 122 is a member that prevents the detachable member 130 housed in the housing portion 121a from falling out, and is formed of a plate-like member that is rotatably connected to the tray 121 by a hinge 122a. In other words, the retaining portion 122 is provided with the hinge 122a that allows it to rotate with respect to the tray 121, and is configured to be switchable between a retained state in which the plate-like body is in a substantially horizontal state and an open state in which the plate-like body faces a substantially vertical direction. With this configuration, the retaining portion 122 is configured to be switchable between a retained state in which the detachable member 130 housed in the housing portion 121a is partially covered from above and an open state in which the detachable member 130 is not covered. Then, the retaining portion 122 is housed in the housing portion 121a and then set to the retained state, whereby the detachable member 130 follows the tray 121. Note that the configuration of the retaining portion 122 is not limited to this, and may be a hole or a slit, etc., as long as it is configured to prevent the detachable member 130 from falling out.

[0048] The guide portion 123 is a rod-shaped member having an insertion hole through which the rail portion 112 provided on the base unit 110 can be inserted, and is fixed to the rear surface side of the tray 121. The rail portion 112 of the base unit 110 reciprocates within the insertion hole of the guide portion 123 of the slide unit 120, thereby enabling the slide unit 120 to slide relative to the base unit 110. Note that the guide portion 123 may be configured to be reciprocable relative to the rail portion 112, and may be something other than a rod-shaped member having an insertion hole.

[0049] The engaging portion 124 is a rod-shaped member fixed to the tray 121 and / or the guide portion 123, and has a plurality of projections and recesses formed along the reciprocating direction. The projections and recesses formed along the reciprocating direction of the engaging portion 124 cooperate with the projections and recesses of the locking mechanism 113 described above to regulate the movement of the slide unit 120.

[0050] 4 shows the tensioning unit 100 that can reciprocate in a direction perpendicular to the side of the bed frame 30, but as for the tensioning unit 100 with a fixed structure that does not reciprocate, as shown in Fig. 6, it is composed only of the tray 121 and the retaining part 122 of the tensioning unit 100 that can reciprocate, so the explanation is omitted. As shown in Fig. 6, the base part 110 in the tensioning unit 100 with a fixed structure that does not reciprocate is composed of a frame-shaped member that is approximately rectangular in plan view and located below the tray 121.

[0051] Next, the hanging member 130 will be described. As shown in FIG. 5, the hanging member 130 according to this embodiment is composed of a plate portion 131 having a generally rectangular shape in plan view that is long in a direction parallel to the edge where the stretching unit 100 is installed and has a shape that can be accommodated in the accommodation portion 121a of the tray 121, and a plurality of hanging portions 132 that can be hung and detached from the hooking portion 22 at the edge of the sheet 20, which are formed on one side in the longitudinal direction of the plate portion 131. That is, a plurality of hanging portions 132 made of hook-shaped members are formed on one side of the plate portion 131 that is formed in a generally rectangular shape. The hanging portions 132 are set so as to pull the hooking portion 22 of the sheet 20 that is engaged with the hanging portion 132 in the same direction when the tray 120 is moved toward the center of the bed frame 30.

[0052] [Sheet stretching procedure using the sheet stretching device 10] Next, the procedure for stretching the sheet 20 using the sheet-stretching device 10 according to this embodiment will be described with reference to Figs. 7 to 9. Fig. 7 is a schematic diagram showing the procedure for spreading the sheet 20, which is the target of the sheet-stretching device 10 according to this embodiment, on the mattress 40. Fig. 8 is a schematic diagram showing the procedure for hanging the hanging / removing member 130 on the sheet 20. Fig. 9 is a schematic diagram showing the state in which the sheet 20 is stretched using the sheet-stretching device 10 according to this embodiment. In Figs. 7 and 9, the sheet-stretching device 10 according to this embodiment is hardly shown because it is sandwiched between the mattress 40 and the bed frame 30. At this time, the mattress 40 is placed on the support member 200, and the slide units 120 are in a state in which they can reciprocate without being restricted in their movements.

[0053] First, as shown in FIGS. 7(a) to (c), the sheet 20 is spread on the mattress 40 placed on the support member 200 of the sheet-stretching device 10 according to this embodiment (step S100).

[0054] At this time, since each side of the sheet 20 is larger than the sides of the mattress 40, the end of the long side 21b may be folded so that the hook portion 22 on the long side 21b is placed on the mattress 40, as shown in FIG. 7(c).

[0055] In this embodiment, as shown in Fig. 7(a), the sheet 20 is wound around the winding rod 50 with the end of the long side 21b folded, and the winding rod 50 around which the sheet 20 is wound is rolled over the mattress 40 (Fig. 7(b)), thereby spreading the sheet 20 out onto the mattress 40. In this way, by simply rolling the winding rod 50 over the mattress 40, the sheet 20 can be spread out with the hook portion 22 of the long side 21b exposed above the mattress 40, as shown in Fig. 7(c).

[0056] It should be noted that the winding rod 50 as shown in Figure 7(a) is not essential, and as long as the mattress sheet 20 of this embodiment can be spread out on the mattress 40, it is possible to spread it out from a folded rectangular state, for example, without using the winding rod 50.

[0057] Next, as shown in FIG. 8, the detachable portion 132 of the hanging member 130 is engaged with the hooking portion 22 provided on the long side 21b of the sheet 20, and the detachable portion 132 of the hanging member 130 is engaged with the hooking portion 22 provided on the short side 21a (step S110). At this time, as shown in FIG. 8(a) and FIG. 8(b), the hanging member 132 is engaged with the hooking portion 22 so that the hanging member 132 is positioned outside the mattress 40. After the hanging member 132 is engaged with the hooking portion 22, the hanging member 130 may be turned over several times on the mattress 40 to wrap the sheet 20 around the hanging member 130. By performing this operation, the sheet 20 can be pulled reliably when the hanging member 130 is accommodated in the accommodation portion 121a and stretched. The above-mentioned operation of engaging and inverting is performed for all of the hooking members 130 engaged with the long sides 21b and short sides 21a. In this embodiment, as shown in Fig. 8(b), one hooking member 130 is attached to the hook portion 22 of one long side 21b, one hooking member 130 is attached to the hook portion 22 of one short side 21a, and a total of four hooking members 130 are attached to two sets of short sides 21a and long sides 21b.

[0058] Then, although not shown, the hanging members 130 attached to the hooking parts 22 on the short side 21a and the hooking parts 22 on the long side 21b are accommodated in the accommodation parts 121a of the tray 121 in the tensioning unit 100 arranged on the corresponding edges (step S120). At this time, the tray 121 provided in the slide unit 120 is slid out from below the mattress 40, and the hanging members 130 are accommodated in the accommodation parts 121a. This operation of accommodating the hanging members 130 in the accommodation parts 121a of the tray 121 is performed for all four hanging members 130.

[0059] Then, the retaining portion 122, which is rotatably connected to the tray 121 by means of the hinge 122a, is tilted horizontally to bring the hook-and-loop member 130 into a retaining state that prevents the hook-and-loop member 130 from slipping out of the storage portion 121a (step S130).

[0060] Furthermore, in the tensioning unit 100 equipped with the slide unit 120, the tray 121 is manually pushed in and moved toward the center of the mattress 40 (step S140). This action allows the hooking part 132 on the back side of the mattress 40 to pull the hooking part 22 of the sheet 20 toward the center of the mattress 40, and at least in the area where the hooking part 132 is installed, the sheet 20 can be folded toward the back side of the mattress 40 without wrinkling.

[0061] At this time, in the sheet stretching device 10 of this embodiment, as shown in FIG. 2, a fixed-structure stretching unit 100 without a slide unit 120 is arranged on the side opposite the stretching unit 100 equipped with a slide unit 120, so that the end of one side of the sheet 20 can be pulled by the slide unit 120 starting from the fixed-structure stretching unit 100, and the end of the sheet 20 can be folded onto the back side of the mattress 40 without forming wrinkles on the opposing pair of sides.

[0062] By repeating this operation on the other pair of opposing sides, the ends of the sheet 20 can be pulled on the opposing long and short sides starting from the fixed-structure tensioning unit 100, and the ends of the sheet 20 can be folded onto the back side of the mattress 40 without forming wrinkles, as shown in Figure 9.

[0063] When both of the stretching units 100 arranged on a pair of opposing sides are equipped with the slide units 120, the ends of the sheets 20 may be pulled by the slide units 120 one by one.

[0064] According to the sheet-stretching device 10 configured in this manner, the sheet-stretching device 10 is made up of a plurality of stretching units 100 arranged facing each other and a support member 200 arranged between the plurality of stretching units 100 and supporting the mattress 40 at a predetermined height. Therefore, by appropriately arranging the plurality of stretching units 100 on the bed frame 30, it is possible to provide a sheet-stretching device 10 that can stretch the sheets 20 in directions perpendicular to each of the long and short sides, regardless of the size of the bed.

[0065] In addition, since each stretching unit 100 is formed by a unit having a base unit 110, a tray 121, and a hanging member 130, by preparing multiple stretching units 100, it is possible to provide a sheet stretching device 10 that can be used for beds of various sizes.

[0066] Moreover, since the base unit 110, which plays a role in supporting the tensioning unit 100, is formed separately from the support member 200 that supports the mattress 40, it is only necessary to change the shape and size of the support member 200 to accommodate slight differences in the size of the bed frame 30 or the mattress 40, and bed frames 30 of different sizes can be accommodated without changing the size of the tensioning unit 100 including the base unit 110. In other words, since the tensioning unit 100 is not involved in supporting the mattress 40, even if there are differences in the sizes of the bed frame 30 or the mattress 40, there is no need to change the size of the tensioning unit 100 itself, and a tensioning unit 100 of a predetermined size can be used to accommodate beds of various sizes, facilitating mass production and leading to cost reduction.

[0067] Furthermore, at least one of the opposing tensioning units 100 is installed on the base unit 110 below the position where the support member 200 supports the mattress 40, so that the tray 121 can move back and forth in a direction perpendicular to the opposing side of the bed frame 30, and since the hanging member 130 moves following the tray 121, the end of the sheet 20 can be easily folded toward the back side of the mattress 40 by simply pushing the tray 121 toward the center of the mattress 40 with the hanging portion 132 hooked onto the hook portion 22 of the sheet 20, and the sheet 20 can be tensioned over the mattress 40 without effort and without wrinkles.

[0068] In addition, the tray 121 includes a roughly square-shaped storage section 121a that stores the hanging member 130, and includes a retaining section 122 at the end of the storage section 121a that prevents the stored hanging member 130 from falling out. The hanging member 130 is composed of a plate section 131 that includes a hanging section 132 that can be detached from the hook section 22, so that the hanging member 130 can be removed from the tray 121 as needed. Therefore, the operation of hooking the hanging section 132 of the hanging member 130 removed from the tray 121 to the hook section 22 provided at the end of the sheet 20 can be easily performed, and the stretching work can be performed more easily. In addition, by positioning the hanging member 130 below the retaining section 122 with the hanging section 132 hooked on the hook section 22, the hanging member 130 can be stretched while being prevented from falling out of the tray 121.

[0069] Furthermore, since tray 121 can move back and forth in a direction perpendicular to a pair of opposing sides using rail portion 112 provided on base unit 110, a mechanism for reciprocating movement can be constructed without using a complex mechanism.

[0070] In addition, a lock mechanism 113 is further provided to restrict the movement of the tray 121, so that the tray 121 can be moved to a desired position, tension can be applied, and then the desired position can be maintained.

[0071] In addition, since the hooking / detaching portion 132 is composed of a plurality of hook-shaped members, the end of the sheet 20 within a predetermined range can be pulled simply by moving one tray 121, thereby saving the labor required to tension the sheet 20.

[0072] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Furthermore, the effects described in the embodiments of the present invention are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments of the present invention.

[0073] Furthermore, the above-described embodiment has been described in detail in order to clearly explain the present invention, and the present invention is not necessarily limited to having all of the configurations described. [Industrial Applicability]

[0074] The sheet stretching device of the present invention can be applied to facilities where bed making requires a great deal of effort, such as beds in hotels and nursing homes. The technology of the present invention can also be applied to facilities that require stretching various types of cloth, such as sofa covers and train seats, in addition to bed sheets. [Explanation of symbols]

[0075] 10 Sheet stretching device 100 Tensioning Unit 110 Base Unit 111 Base 112 Rail section 113 Locking mechanism 120 Slide unit 121 Tray 121a Storage unit 122 Stopper 122a Hinge 123 Guide part 124 Engagement part 200 Support member 210 Storage unit 220 Cover body 20 sheets 21 Sheet body 21a Long side 21b Short side 22 Hook 23 String-like member 23t Sewing section 30 Bed Frame 40 Mattress 50 Winding rod

Claims

1. A sheet stretching device stretches a sheet, which is formed in a generally rectangular shape in a plan view having two pairs of opposing sides and has a plurality of hooks arranged in parallel along the edges of at least one of the two pairs of opposing sides, on a mattress formed in a generally rectangular parallelepiped shape and placed on a bed frame, The sheet-stretching device is composed of a plurality of stretching units arranged to face each other at two sets of opposing edge portions of the bed frame, and a support member arranged between the plurality of stretching units and supporting the mattress at a predetermined height, Each of the tensioning units includes a base unit formed in a generally rectangular shape in a plan view and placed on the bed frame, a tray installed on the base unit, and a hanging member that is accommodated in the tray and has a hanging portion that can be hung on and detached from the hook portion; At least one of the tensioning units arranged to face each other is installed on the base unit so that the tray can reciprocate in a direction perpendicular to the opposite sides of the bed frame below a position where the support member supports the mattress, and the hook-and-loop member moves following the tray. Sheet tensioning device.

2. The tray includes a substantially square-shaped storage section for storing the detachable member, and includes a retaining portion at an end of the storage section for preventing the stored detachable member from falling out, The hooking / detaching member is constituted by a plate portion having a hooking / detaching portion that can be hooked and detached to the hook portion.

2. The sheet tensioning device of claim 1.

3. The tray is reciprocally movable in a direction perpendicular to the pair of opposing sides by a rail portion provided on the base unit.

3. A sheet tensioning device according to claim 1 or 2.

4. A locking mechanism is further provided to restrict the movement of the tray.

4. The sheet tensioning device of claim 3.

5. The hook-and-loop portion is formed by a plurality of hook-shaped members.

5. The sheet tensioning device of claim 4.

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