A linkage folding plastic workbench

Abstract

The present invention relates to a linkage folding plastic workbench, comprising a tabletop mechanism and a foot rod mechanism. The tabletop mechanism comprises a crossbeam, a static tabletop and a dynamic tabletop. A screw mechanism is arranged on the crossbeam, and is characterized in that a slide rail is arranged on the side wall of the crossbeam, and a locking slide rail is arranged at the end of the slide rail; the upper end of the first foot rod is hinged to the crossbeam, the upper end of the second foot rod is hinged to the upper part of the first foot rod, the upper end of the third foot rod is slidably connected to the locking slide rail through a pin shaft, and the lower end of the third foot rod is hinged to the lower part of the first foot rod; a locking mechanism is arranged above the locking slide rail. The present invention has a crossbeam, multiple foot rods and a three-fold folding support bar. The first foot rod is driven to rotate and fold by sliding and flipping the third foot rod, and the second foot rod is driven to fold with the cooperation of the folding support bar, and the folding of the stand is completed in one step; it also has a locking mechanism, and the locking and unlocking of the foot rod is realized by the engagement and cooperation of a rotatable locking slot and a pin shaft.

Description

Technical Field

[0001] The invention belongs to the field of woodworking workbenches, and in particular relates to a linkage folding plastic workbench. Background Art

[0002] The woodworking workbench is used to clamp wood so as to process and handle the wood. In order to reduce the space occupied by the workbench and facilitate storage, carrying and transportation, the workbench legs can be folded. Common folding structures include single leg rods folding alone, X-shaped leg rods folding across each other, herringbone leg rods first closing together and then flipping and folding, etc. However, the above folding structures require multiple steps to complete the folding operation, or the folded legs are not compact enough with the table top. Summary of the invention

[0003] The present invention mainly aims at the problems existing in the folding structure of the tripod and invents a linked folding plastic workbench, which has a crossbeam, multiple leg rods and a three-fold folding strut. The sliding and flipping of a certain leg rod drives the rotation and folding of another leg rod, and the folding of other leg rods is driven with the cooperation of the leg rod strut, and the folding of the tripod is completed in one step. The present invention also has a locking mechanism, which utilizes the engagement of a rotatable locking slot and a pin shaft to achieve locking and unlocking of the leg rod.

[0004] The above technical problems of the present invention are implemented through the following technical solutions: a linked folding plastic workbench, including a table top mechanism and a foot rod mechanism supporting the table top mechanism, the table top mechanism including two parallel cross beams, a static table top and a dynamic table top connected to the two cross beams, the cross beams are provided with a screw mechanism for moving the dynamic table top horizontally, the dynamic table top is connected to the screw mechanism, and is characterized in that one end of the cross beam is set as a hinged end, and the other end is set as an operating end, a slide rail is set on the side wall of the cross beam, the slide rail extends axially from the operating end of the cross beam to the hinged end, and the end of the slide rail close to the operating end has a locking slide rail extending vertically upward.

[0005] Both the static table and the dynamic table are equipped with clamping blocks to assist in clamping the wood; the dynamic table moves relatively under the pushing action of the screw mechanism to achieve clamping of the wood; the clamping distance is adjustable to accommodate wood of different specifications.

[0006] The upper end of the first foot rod is hinged to the hinged end of the cross beam through a hinge, the first foot rod is inclined, and the lower end of the first foot rod is inclined downward and extends in the direction of the operating end of the cross beam; the upper end of the second foot rod is hinged to the upper part of the first foot rod through a hinge, and the second foot rod is inclined in the direction away from the first foot rod; the upper end of the third foot rod is slidably connected to the locking slide rail through a pin shaft, and the lower end of the third foot rod is hinged to the lower part of the first foot rod through a hinge.

[0007] The crossbeam is configured as a hollow semi-square tube with a U-shaped cross section, including a top plate, a left plate and a right plate respectively perpendicular to the top plate; the left plate and the right plate are provided with horizontally aligned slide rails and locking slide rails; the upper end of the third foot rod is located between the left plate and the right plate; the upper end of the first foot rod is located between the ends of the left plate and the right plate.

[0008] When the upper end of the third leg rod slides along the slide rail, the lower end of the third leg rod is lifted and tilted upward, thereby driving the lower end of the first leg rod to be lifted and tilted synchronously, and the first leg rod rotates upward as a whole; since a three-section folding support bar is connected between the first leg rod, the second leg rod and the third leg rod, the third leg rod is also driven to gradually rotate and approach the first leg rod; finally, the third leg rod, the first leg rod and the second leg rod are folded horizontally and stacked in sequence from top to bottom; the folded leg rod mechanism is parallel to the crossbeam and is tightly attached to the bottom of the crossbeam, very close to the table top.

[0009] A locking mechanism is provided at the operating end of the cross beam and above the locking rail. The locking mechanism is hinged to the side wall of the cross beam through a hinge. The locking mechanism is provided with a concave locking slot. When the pin is at the upper end of the locking rail, the locking slot can engage with the pin to limit the downward movement of the pin. When the locking operation is performed, the locking slot clamps the pin from bottom to top, and the pin and the third foot rod are slightly lifted while rotating until the pin is locked at the upper end of the locking rail and cannot slide along the rail. When unlocking, the locking slot is rotated in the opposite direction. When the locking slot and the pin are disengaged from each other, the pin moves down into the rail, moves along the rail and drives the third foot rod to rotate; when the pin slides to the other end of the rail, the third foot rod is horizontal.

[0010] A three-section folding stay is connected between the middle parts of the first foot rod, the second foot rod and the third foot rod.

[0011] Preferably, the cross beam is configured as a hollow semi-square tube with a U-shaped cross-section, including a top plate, a left plate and a right plate respectively perpendicular to the top plate; the left plate and the right plate are provided with the horizontally aligned slide rails and the locking slide rails; the upper end of the third foot rod is located between the left plate and the right plate; the upper end of the first foot rod is located between the left plate and the right plate at the hinged end of the cross beam.

[0012] Preferably, the static table top is fixed to the top plate of the cross beam and close to the hinged end; the dynamic table top is located on the cross beam and close to the operating end; the screw mechanism includes a screw rod and a nut sliding seat threadedly connected to the screw rod, the screw rod is supported by the cross beam, and the screw rod is supported by the cross beam and extends from the operating end to the middle of the cross beam; a hollow slide is provided on the top surface of the cross beam, and the slide extends from the top surface close to the operating end to the middle of the top surface; the upper part of the nut sliding seat passes through the slide and is connected to the dynamic table top.

[0013] Preferably, the operating end and the middle of the cross beam are fixed with bearing plates with shaft holes, and the two ends of the screw are connected to the bearing plates; the end of the screw exposed from the cross beam is connected to a rotating handle. The rotating handle is operated to rotate the screw to drive the nut slide to move, and finally drive the dynamic table to move.

[0014] Preferably, the folding struts include a first strut, a second strut, and a third strut; wherein, the middle portion of the first strut is hinged to the middle portion of the first leg rod through a hinge; one end of the second strut is hinged to the middle portion of the second leg rod through a hinge, and the other end of the second strut is hinged to the end portion of the first strut through a hinge; one end of the third strut is hinged to the middle portion of the third leg rod through a hinge, and the other end of the third strut is hinged to the end portion of the first strut through a hinge; the above-mentioned hinges may adopt structures such as rivets and pins.

[0015] Preferably, a first limiting member for limiting the rotation direction is provided at the hinged portion of the first stay and the second stay, and the first limiting member is provided as a folded edge extending vertically relative to the side of the first stay or the second stay; a second limiting member for limiting the rotation direction is provided at the hinged portion of the first stay and the third stay, and the second limiting member is provided as a folded edge extending vertically relative to the side of the first stay or the third stay. The first stay, the second stay, and the third stay are all strips, and a relatively inclined bending portion is provided in the middle of the first stay, and a relatively inclined bending portion is provided in the middle of the third stay.

[0016] The folding struts are folded in a Z shape. The folding of the third leg rod and the first leg rod drives the relative rotation and folding of the third leg rod and the first leg rod. The movement of the first leg rod drives the second leg rod to rotate and gradually approach the first leg rod.

[0017] Preferably, the locking mechanism comprises a mounting portion and a locking slot, wherein the mounting portion has a horizontally penetrating mounting through hole; at the same time, a hinge column is vertically fixed on the side wall of the crossbeam, and the mounting portion is connected to the hinge column through the mounting through hole. The locking slot can only be driven to rotate when the mounting portion rotates as a whole.

[0018] Preferably, the locking mechanisms at the operating ends of the two parallel cross beams face each other, and an operating horizontal plate is connected between the two mounting parts at opposite positions. External force acts on the operating horizontal plate to drive the mounting parts to rotate, thereby engaging or disengaging the locking slot and the pin shaft. The operating horizontal plate is connected to the two mounting parts at the same time. When external force acts on the operating horizontal plate to flip it, the two mounting parts and the locking slot rotate synchronously to complete the locking or unlocking operation.

[0019] Preferably, a limit baffle is connected between the two mounting parts in opposite positions, and the lower edges of the two ends of the limit baffle are provided with limit grooves. At the same time, a torsion spring is connected to the hinge column, and the steel wire rod extending from the torsion spring toward the limit baffle can be embedded in the limit groove to prevent the operating horizontal plate and the limit baffle from rotating excessively.

[0020] Preferably, the upper end of the second foot rod is connected to the articulated seat, and the lower end of the third foot rod is connected to the articulated seat; the main body of the articulated seat is sleeved on the foot rod, and two parallel articulated plates with axial holes are connected to the side walls of the main body of the articulated seat, and the two articulated plates are clamped on both sides of the foot rod and are hinged by pins; the articulated seat and the articulated plates realize the articulation between the foot rods on the one hand, and on the other hand, are used to control the distance between the foot rods after folding, and the length of the articulated plates is set according to the width or diameter of the foot rods to minimize the gap between the folded foot rods.

[0021] A cross piece is connected between the two parallel foot supports, between the two parallel third foot rods, and between the two parallel second foot rods, so that the two foot supports are linked and the overall firmness of the foot supports is increased.

[0022] In summary, the present invention has the following advantages compared with the prior art:

[0023] The present invention comprises a crossbeam, a tripod and a three-fold folding support bar. The third leg bar slides and flips to drive the first leg bar to rotate and fold, and the second leg bar is folded with the cooperation of the folding support bar, so that the folding of the tripod is completed in one step. The present invention also comprises a locking mechanism, which utilizes the engagement of a rotatable locking slot and a pin shaft, and the operating cross plate is connected to the two mounting parts at the same time. When an external force acts on the operating cross plate to flip it, the two mounting parts and the locking slot rotate synchronously to complete the locking or unlocking operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 is a side view of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the foot rod mechanism of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the foot rod mechanism of the present invention;

[0028] Figure 5 yes Figure 4 A magnified view of part A;

[0029] Figure 6 It is a schematic diagram of the folding process of the present invention.

[0030] The numbers in the figure are: 1. foot rod mechanism; 10. pin shaft; 11. first foot rod; 12. second foot rod; 13. third foot rod; 2. cross beam; 3. slide rail; 4. locking slide rail; 5. screw rod mechanism; 51. screw rod; 52. slide rail; 53. rotating handle; 6. locking mechanism; 61. locking slot; 62. mounting portion; 63. hinged column; 64. operating horizontal plate; 65. limit baffle; 66. limit slot; 67. cross member; 7. folding stay; 71. first stay; 72. second stay; 73. third stay; 74. first limiting member; 75. second limiting member; 8. hinged seat; 91. static table top; 92. dynamic table top. Specific implementation method 51

[0032] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0033] Embodiment 1:

[0034] like Figure 1 , 2 As shown in Figures 3, 4 and 5, a linkage folding plastic workbench includes a table top mechanism and a foot rod mechanism 1 for supporting the table top mechanism; the table top mechanism includes two parallel cross beams 2, a static table top 91 and a dynamic table top 92 connected to the two cross beams 2, a screw mechanism 5 for translating the dynamic table top 92 is installed on the cross beam 2, the dynamic table top 92 is connected to the screw mechanism 5, the static table top 91 and the dynamic table top 92 are both made of plastic, and clamps are installed on the table tops.

[0035] Specifically, the cross beam 2 is a hollow semi-square tube with a U-shaped cross section, consisting of a top plate, a left plate and a right plate respectively perpendicular to the top plate; one end of the cross beam 2 is set as a hinged end, and the other end is set as an operating end, which is the end for moving the operating table and folding the operating foot rod.

[0036] The static table top 91 is fixed to the top plate of the cross beam 2 and is close to the hinged end, while the dynamic table top 92 is located on the cross beam 2 and is close to the operating end; and there is a hollow slide 52 on the top surface of the cross beam 2, and the slide 52 extends from the top surface close to the operating end to the middle of the top surface.

[0037] The screw mechanism 5 is mainly composed of a screw rod 51 and a nut sliding seat; a bearing plate with an axial hole is fixed at the operating end and the middle part of the cross beam 2, and the two ends of the screw rod 51 are respectively connected to the bearing plates, the nut sliding seat is threadedly connected to the screw rod, and the upper part of the nut sliding seat passes through the slideway 52 and is connected to the dynamic table top 92; the end of the screw rod 51 exposed from the cross beam 2 is connected to the rotating handle 53.

[0038] The cross beam 2 has downward protrusions on the left and right plates near the hinged end, and axial holes are symmetrically arranged on the protrusions; horizontally aligned slide rails 3 are symmetrically arranged on the left and right plates of the cross beam 2, and the slide rail 3 is a hollow groove and extends axially from the operating end of the cross beam 2 to the hinged end, and the end of the slide rail 3 near the operating end has a locking slide rail 4 extending vertically upward.

[0039] The upper end of the first foot rod 11 is hinged to the hinge end of the cross beam 2, specifically the axial hole of the raised portion, through a hinge such as a rivet or a pin; the upper end of the first foot rod 11 is located between the left plate and the right plate of the cross beam 2; the first foot rod 11 is inclined, and the lower end of the first foot rod 11 extends downwardly in an inclined direction toward the operating end of the cross beam 2.

[0040] The upper end of the second leg rod 12 is hinged to the upper part of the first leg rod 11 through a hinge such as a rivet or a pin, and the second leg rod 12 is inclined in a direction away from the first leg rod 11 .

[0041] The upper end of the third leg rod 13 is slidably connected to the locking slide rail 4 through a pin shaft 10 , and the lower end of the third leg rod 13 is hinged to the lower part of the first leg rod 11 through a hinge such as a rivet or a pin.

[0042] The foot bar can be in the shape of a hollow semi-square tube or a hollow semi-circular tube.

[0043] A cross member 67 is connected between two parallel third foot rods 13, and the cross member 67 is located at the lower part connected to the third foot rod 13; a cross member 67 is connected between two parallel second foot rods 12, and the cross member 67 is located at the lower part connected to the second foot rod 12; the cross member 67 is configured as a plate bent at a right angle, including a horizontal plate and a vertical plate, and the plate surface of the horizontal plate has a plurality of through holes for hanging temporary tools or placing temporary tools.

[0044] The upper end of the second foot rod 12 is connected to the hinge seat 8, and the lower end of the third foot rod 13 is connected to the hinge seat 8; the main body of the hinge seat 8 is a semi-tubular sleeve that matches the foot rod structure, and the main body of the hinge seat 8 is sleeved on the foot rod. The edges of the two side walls at the opening of the main body of the hinge seat 8 extend to form two parallel hinge plates, which have axial holes. The two hinge plates are clamped on both sides of the foot rod and are hinged by pins.

[0045] A locking mechanism 6 is installed at the operating end of the cross beam 2 and above the locking rail 4. The locking mechanism 6 is mainly composed of a mounting portion 62 and a locking slot 61. The mounting portion 62 is configured as a plate, and a horizontally penetrating mounting hole is provided on its upper portion; the locking slot 61 is located at the lower portion of the mounting portion 62, and is formed by a recessed edge of the mounting portion 62; at the same time, a hinge column 63 is vertically fixed on the side wall of the cross beam 2 facing the other cross beam 2, and the mounting portion 62 is connected to the hinge column 63 via the mounting hole; when the pin shaft 10 is at the upper end of the locking rail 4, the locking slot 61 can engage with the pin shaft 10 to limit the downward movement of the pin shaft 10.

[0046] The two parallel cross beams 2 have locking mechanisms 6 at their operating ends facing each other, and an operating cross plate 64 is connected between the two opposite mounting portions 62, and the operating cross plate 64 is horizontally connected between the two cross beams 2; when external force acts on the operating cross plate 64, it can drive the mounting portion 62 to rotate, thereby engaging or disengaging the locking slot 61 and the pin shaft 10 with each other.

[0047] A limit baffle 65 is also connected between the two relatively positioned mounting portions 62. The limit baffle 65 and the operating cross plate 64 are located on two relatively positioned sides. The lower edges of the two ends of the limit baffle 65 are provided with recessed limit grooves 66. At the same time, a torsion spring is connected to the hinge column 63. The steel wire rod extending from the torsion spring toward the limit baffle 65 can be embedded in the limit groove 66 to limit the rotation range.

[0048] A three-section folding stay 7 is connected between the middle parts of the first leg rod 11, the second leg rod 12, and the third leg rod 13; the folding stay is mainly composed of a first right stay 71, a second stay 72, and a third stay 73 connected.

[0049] Among them, the middle part of the first support bar 71 is hinged to the middle part of the first leg rod 11 through a hinge such as a rivet or a pin; one end of the second support bar 72 is hinged to the middle part of the second leg rod 12 through a hinge such as a rivet or a pin, and the other end of the second support bar 72 is hinged to the end of the first support bar 71 through a hinge such as a rivet or a pin; one end of the third support bar 73 is hinged to the middle part of the third leg rod 13 through a hinge such as a rivet or a pin, and the other end of the third support bar 73 is hinged to the end of the first support bar 71 through a hinge such as a rivet or a pin.

[0050] A first limiting member 74 for limiting the rotation direction is provided at the hinged portion between the first support 71 and the second support 72; specifically, the first limiting member 74 is configured as a folded edge extending vertically relative to the side of the first support 71, and the folded edge is below the hinged portion; a second limiting member 75 for limiting the rotation direction is provided at the hinged portion between the first support 71 and the third support 73; specifically, the second limiting member 75 is configured as a folded edge extending vertically relative to the side of the first support 71, and the folded edge is above the hinged portion.

[0051] In order to match the misalignment distance between the foot rods, the middle of the first support bar 71 has a relatively inclined bending portion, and the middle of the third support bar 73 also has a relatively inclined bending portion to prevent the support bar from being forcibly twisted due to the misalignment of the foot rods.

[0052] like Figure 6 As shown, the folding process is as follows: the locking mechanism is unlocked, and when the upper end of the third leg rod slides along the slide rail, the lower end of the third leg rod is lifted along with the upward tilt, thereby driving the lower end of the first leg rod to be lifted synchronously, and the first leg rod rotates upward as a whole; under the action of the folding support bar, the second leg rod is also driven to gradually rotate and approach the first leg rod; finally, the third leg rod, the first leg rod, and the second leg rod are folded horizontally and stacked in sequence from top to bottom; the folded leg rod is parallel to the crossbeam, and is tightly attached to the bottom of the crossbeam, and is very close to the table top.

[0053] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A linkage folding plastic workbench, comprising a tabletop mechanism and a foot rod mechanism (1) supporting the tabletop mechanism, wherein the tabletop mechanism comprises two parallel cross beams (2), a static tabletop (91) and a dynamic tabletop (92) connected to the two cross beams, a screw mechanism (5) for translating the dynamic tabletop is arranged on the cross beam, and the dynamic tabletop is connected to the screw mechanism, characterized in that: One end of the cross beam is arranged as a hinged end, and the other end is arranged as an operating end. A slide rail (3) is arranged on the side wall of the cross beam. The slide rail extends axially from the operating end of the cross beam to the hinged end. The end of the slide rail close to the operating end has a locking slide rail (4) extending vertically upwards. The upper end of the first foot rod (11) is hinged to the hinged end of the cross beam member through a hinge member, the first foot rod is inclined, and the lower end of the first foot rod extends downwardly in a direction toward the operating end of the cross beam member; The upper end of the second foot rod (12) is hinged to the upper part of the first foot rod through a hinge, and the second foot rod is inclined in a direction away from the first foot rod; The upper end of the third foot rod (13) is slidably connected to the locking slide rail via a pin shaft (10), and the lower end of the third foot rod is hinged to the lower part of the first foot rod via a hinge; A locking mechanism (6) is provided at the operating end of the cross beam and above the locking slide rail. The locking mechanism is hinged to the side wall of the cross beam through a hinge. The locking mechanism is provided with a concave locking slot (61). When the pin shaft is at the upper end of the locking slide rail, the locking slot can engage with the pin shaft to limit the downward movement of the pin shaft. A folding support bar (7) is connected between the middle parts of the first foot bar, the second foot bar and the third foot bar; The folding stays include a first stay (71), a second stay (72), and a third stay (73); wherein the middle portion of the first stay is hinged to the middle portion of the first leg rod via a hinge; one end of the second stay is hinged to the middle portion of the second leg rod via a hinge, and the other end of the second stay is hinged to the end portion of the first stay via a hinge; one end of the third stay is hinged to the middle portion of the third leg rod via a hinge, and the other end of the third stay is hinged to the end portion of the first stay via a hinge; A first limiting member (74) for limiting the rotation direction is provided at the hinged portion between the first support and the second support, and the first limiting member is provided as a folded edge extending vertically relative to the side of the first support or the second support; a second limiting member (75) for limiting the rotation direction is provided at the hinged portion between the first support and the third support, and the second limiting member is provided as a folded edge extending vertically relative to the side of the first support or the third support; The locking mechanism comprises a mounting portion (62) and a locking slot (61), the mounting portion having a horizontally penetrating mounting through hole; at the same time, a hinge column (63) is vertically fixed on the side wall of the crossbeam, and the mounting portion is connected to the hinge column; The locking mechanisms at the operating ends of the two parallel cross beams face each other, and an operating cross plate (64) is connected between the two mounting parts that are located opposite to each other, and an external force acts on the operating cross plate to drive the mounting parts to rotate, thereby engaging or disengaging the locking slot and the pin shaft. A limit baffle (65) is also connected between the two mounting parts in opposite positions, and the lower edges of the two ends of the limit baffle are provided with limit grooves (66). At the same time, a torsion spring is connected to the hinge column, and the steel wire rod extending from the torsion spring toward the limit baffle can be embedded in the limit groove.

2. The linkage folding plastic workbench according to claim 1 is characterized in that: The cross beam is configured as a hollow semi-square tube with a U-shaped cross section, including a top plate, a left plate and a right plate respectively perpendicular to the top plate; the left plate and the right plate are provided with the horizontally aligned slide rails and the locking slide rails; the upper end of the third foot rod is located between the left plate and the right plate; the upper end of the first foot rod is located between the left plate and the right plate at the hinged end of the cross beam.

3. The linkage folding plastic workbench according to claim 2 is characterized in that: The static table top is fixed to the top plate of the cross beam and is close to the hinged end; the dynamic table top is located on the cross beam and is close to the operating end; the screw mechanism comprises a screw rod (51) and a nut sliding seat threadedly connected to the screw rod, the screw rod is supported by the cross beam, and the screw rod is supported by the cross beam and extends from the operating end to the middle of the cross beam; a hollow slideway (52) is provided on the top surface of the cross beam, and the slideway extends from the top surface close to the operating end to the middle of the top surface; the upper part of the nut sliding seat passes through the slideway and is connected to the dynamic table top.

4. The linkage folding plastic workbench according to claim 3 is characterized in that: The cross beam has bearing plates with shaft holes fixed to its operating end and middle part, and both ends of the screw are connected to the bearing plates; the end of the screw exposed outside the cross beam is connected to a rotating handle (53).

5. The linkage folding plastic workbench according to claim 1 is characterized in that: The upper end of the second foot rod is connected to the hinge seat (8), and the lower end of the third foot rod is connected to the hinge seat; the main body of the hinge seat is sleeved on the foot rod, and the side wall of the main body of the hinge seat is connected to two parallel hinge plates with shaft holes, and the two hinge plates are clamped on both sides of the foot rod and are hinged through a pin shaft; a cross piece (67) is connected between the two parallel foot brackets, between the two parallel third foot rods, and between the two parallel second foot rods.

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