JP3053871U - Lifting chair - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention relates to an elevator chair, and more particularly, to an elevator chair that can be sufficiently raised and lowered with a small operation stroke just by pressing a pedal and has excellent operability. SOLUTION: This invention pivotally attaches a lower frame placed on an installation surface to serve as a base, an upper frame supporting a seat portion of a seat, and an upper frame and a lower frame so that the upper and lower frames move up and down in parallel. A parallel link mechanism, a pump for supplying pressure oil each time the operation pedal is depressed, an operating cylinder for raising the rod with the supplied pressure oil, a lifting link that moves up and down by moving the rod up and down, and the lifting link A hydraulic unit comprising an elevating / lowering operating unit integrally provided at the upper end of the unit and attached to the upper frame, a release lever for draining pressure oil from the operating cylinder to the pump side and lowering the rod, and Urging means for urging upward.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a lift chair, and more particularly to a lift chair that can be sufficiently lifted and lowered with a small operation stroke just to depress a pedal and has excellent operability.

[0002]

[Prior art]

 An up-and-down chair is known to use a pantograph-type link to raise and lower the seat, as shown in, for example, Japanese Utility Model Application Publication No. Sho 63-45644. However, it is expensive because an electric motor is used. In addition, since the link supporting the seat portion is directly operated to move up and down, there is a disadvantage that a large load is applied to the link and the link is easily broken.

[0003]

[Problems to be solved by the invention]

 This invention was created to solve the above-mentioned drawbacks, and the main problem is that the upper frame supporting the seat is supported by both the parallel link mechanism and the hydraulic unit to distribute the stress. The lower frame, which supports the seat with the operating part of the hydraulic unit, is moved directly up and down, so that the chair can be moved up and down efficiently without wasting power when moving up and down. To provide.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, in the invention of claim 1, a lower frame which is placed on an installation surface and serves as a base, an upper frame which supports a seat portion of a chair, and an upper and lower frame are provided. A parallel link mechanism pivotally mounted between the upper and lower frames so as to ascend and descend in parallel, a pump for supplying pressure oil each time the operation pedal is depressed, an operating cylinder for raising the rod with the supplied pressure oil, An elevating link that moves up and down by an up and down movement, an elevating and lowering part integrally provided at the upper end of the elevating link and attached to an upper frame, and drains pressure oil from the working cylinder to the pump side to lower the rod. Technical means is provided that comprises a hydraulic unit comprising a release lever for releasing the operating lever and a biasing means for constantly biasing the operation pedal upward.

In the invention of claim 2, a pair of parallel link mechanisms is disposed on both sides of the upper and lower frames in the front-rear direction or the left-right direction, and a hydraulic unit is provided at the center, and the parallel link mechanism is provided at the center. The upper and lower frames are provided with a pair of upper and lower receiving plates that pivotally connect one end of the link member. A pair of guide plates having horizontally extending long holes are provided in a pair of upper and lower sides on the other front and rear sides, and one end side of the link member is pivotally connected to a receiving plate, and the other side of the link member is a guide. The link member is pivotally attached to the guide plate slidably along the long hole of the plate, and when the upper frame is raised, the pivot position on the other side of the link member approaches the pivot position on one side, and the upper frame is separated upward. Guide up to the upper frame At the time of downward ascent, a technical measure is taken in which the pivotal position on the other side of the link member is separated from the pivotal position on one side and guides the upper frame to a position approaching the lower frame.

Further, according to the invention of claim 3, the technical means is that the bottom substrate fixed above the lower frame is held in a hollow position, and the lower part of the hydraulic unit is fixed on the bottom substrate. Have taken.

[0007]

[Embodiment of the invention]

 Hereinafter, a preferred embodiment of the lift chair according to the present invention will be described with reference to the drawings. The elevating chair C shown in FIGS. 1 to 5 has a known seat portion C1 and a backrest portion C2 on the elevating mechanism A. The elevating mechanism A includes an upper and lower frame composed of a pipe formed in a substantially rectangular frame shape, and a pair of parallel link mechanisms L, L disposed near the left and right ends between the lower frame 1 and the upper frame 2. And a hydraulic unit H for raising and lowering the upper frame 2.

As shown in FIG. 2 and FIG. 3, the parallel link mechanism L is arranged in a pair on the left and right sides of the upper and lower frames 1 and 2 so as to be spaced apart from each other. It consists of a link member that crosses

A lower substrate 1a is fitted and fixed above the lower frame 1, and the lower substrate 1a is held by the lower frame 1 at a hollow position above the installation surface. This is because when a hydraulic unit to be described later is mounted on the bottom substrate 1a, when the bottom substrate 1a bends downward due to a load applied to the hydraulic unit, the bottom substrate 1a expands below the lower end surface of the lower frame 1 and swings. This is because the lower end surface of the lower frame 1 is always at the lowermost position to stabilize the chair.

A seat substrate 2a is fitted and fixed above the upper frame 2, and in the illustrated example, the upper frame 2 and the seat substrate 2a are formed so as to be flush with each other. This portion serves as a bottom plate of a seat portion of a seat chair (not shown) to support the seat chair.

Next, as shown in FIG. 2, the rear ends of the link members 3 and 4 of the parallel link mechanism L are pivotally mounted on one of the front and rear sides of the upper and lower frames 1 and 2, that is, on the rear side in the illustrated example. Brackets 3a, 4a of receiving plates pivotally connected at P3, P4 are provided in a pair at the top and bottom. Further, guide plates 3b and 4b having a horizontally extending elongated hole 5 are provided in a pair on the other side of the front and rear of the upper and lower frames 1 and 2, in the illustrated example, on the front side. The pivots P3 ', P4' at the front end of the link members 3, 4 are slidably pivoted along the slots 5, 5 of the guide plates 3b, 4b.

Therefore, when the upper frame 2 is lifted, the pivots P3 ′, P4 ′ on the front side of the link members 3, 4 approach the mounting positions of the pivots P3, P4 on the rear side along the elongated holes 5 to form an X-shape. The upper frame 2 is guided upward by narrowing the vertical crossing angle of the link members 3 and 4 (widening the horizontal crossing angle). When the upper frame 2 is moved downward, the pivots P3 'and P4' on the front side of the link members 3 and 4 are separated from the pivots P3 and P4 on the rear side along the elongated hole 5 and advance forward to form an X-shaped link. The upper and lower crossing angles of the members 3 and 4 are widened (the left and right crossing angles are narrowed) to guide the upper frame 2 to the lower side.

Next, the hydraulic unit H includes a pump 6 for supplying pressure oil to the base H1 each time the operation pedal 6a is depressed, an operating cylinder 7 for raising the rod 7a with the supplied pressure oil, and the rod H A lifting link 8 that moves up and down by the up and down movement of 7a, a lifting and lowering operating section 9 that is provided integrally with the upper end of the lifting and lowering link 8 and that is fixed to the upper frame 2, and pressurized oil from the operating cylinder 7 to the pump 6 side The hydraulic unit comprises a release lever 6b which drains and lowers the rod 7a to lower the raising / lowering operating part 9 via the raising / lowering link 8.

The lifting link 8 is provided in a pair in such a manner as to be symmetrical with respect to the center, and is provided in a pair in the shape of a rectangle having a combination of an upper link 8a and a lower link 8b pivotally connected at the center by a pivot P5. (See FIGS. 1 and 5). That is, the lower end of each lower link 8b is pivotally connected to the base H1 of the hydraulic unit via the pivots P6 and P6, and the upper end of the upper link 8a is pivotally connected to the lifting / lowering operation unit 9 via the pivots P7 and P7.

A connecting plate 7b is fixed to the upper end of the rod 7a of the cylinder 7 erected on the base H1, and both ends of the connecting plate 7b extend outward as they descend. The upper ends of the inclined interlocking plates 8c, 8c are pivotally connected at a pivot P8, and the lower ends of the connecting plates 7b are pivotally connected to a middle position of the lower link 8b by a pivot P9.

In the illustrated example, the operation pedal 6a protrudes forward of the chair, and is set at a standby position slightly above the installation surface. Here, as shown in FIG. 5, the operation pedal 6a pivotally connects the first link 61 having a pedal to the support plate B with the pivot P10 as a fixed pivot point in order to extend and contract the rod 6d of the piston 6c. The second link 62, the third link 63, and the fourth link 64 are arranged so as not to collide with the pump 6 respectively, and the rod 6d of the piston 6c is mounted at an intermediate position of the fourth link 64. The rear side pivotally supports the upper end of the stay 65 pivotally attached to the base H1. A coil spring S compressed between the fourth link 64 and the base H1 is provided at the rear end of the fourth link 64, and the operating pedal 6a is constantly urged upward through the link. ing.

Therefore, when the user depresses the operation pedal 6a, the coil spring S is compressed against the urging force, and when the foot force is not applied, the operation pedal 6a is moved upward by the return force of the coil spring S. After returning to the standby position, the next step is easy. As described above, by depressing the operation pedal 6a with a foot, the rod 6d of the piston 6c is pulled up, the pump 6 is pressurized so as to supply a fixed amount of pressure oil, and the pressure oil is supplied to the cylinder 7. The rod 7a is raised as described above.

Next, when the force is no longer applied to the operation pedal 6a after being depressed, the spring S pulls down the rod 6d of the pressurizing piston and returns the operation pedal 6a to its original upper standby position so that it can be easily depressed. . By repeatedly depressing the operation pedal 6a, the upper frame 2 can be gradually raised via the lifting / lowering operation portion 9.

The release lever 6b protrudes forward of the chair, similarly to the operation pedal 6a, and has a grip at the tip. When used, the grip is rotated to discharge pressure oil from the cylinder 7 to the pump side. Operate valve V in the opening direction. As a result, the rod 7a can be lowered, and the upper frame 2 can be lowered at once through the raising / lowering operating portion 9.

It is preferable to surround the elevating mechanism A with a bellows-type or telescope-type cylindrical elastic member F (shown by a wavy line in FIG. 1) so as to cover the elevating mechanism A. The extension member may be provided with a hole such that the distal ends of the operation pedal 6a and the release lever 6b protrude. Thus, the mechanism can be hidden, and the hands and feet of the user can be prevented from entering. In this invention, the operation pedal is connected by a plurality of links, and the operation is transmitted to the rod of the piston for pump pressurization. However, it is needless to say that the design is appropriately changed depending on the structure of the hydraulic unit. In other words, it goes without saying that various design changes can be made without departing from the gist of the present invention.

[0021]

[Effect of the invention]

 The lift chair of this invention has excellent durability and stability because the upper frame supporting the seat is supported by both the parallel link mechanism and the hydraulic unit to distribute the stress. The lower frame that supports the seat is directly raised and lowered by the operating part of the hydraulic unit, so there is no waste of power when moving up and down, and it can be operated lightly even by a weak elderly person. It is possible to move the chair part up and down efficiently, which is extremely useful. In addition, since a motor is not used and a mechanical structure is used with a simple configuration, the cost can be reduced, which is suitable for industrial mass production.

[Brief description of the drawings]

FIG. 1 is a schematic side view mainly showing a hydraulic unit of a lifting mechanism of a lifting chair.

FIG. 2 is a schematic side view of an elevating mechanism showing an operation of a parallel link mechanism with a hydraulic unit omitted from illustration.

FIG. 3 is a cross-sectional view as viewed from the back.

FIG. 4 is a partial view seen from a plane.

FIG. 5 is a side view of a lowered state.

[Explanation of symbols]

 Reference Signs List A Lifting mechanism H Hydraulic unit H1 Base L Parallel link mechanism 1 Lower frame 1a Bottom board 2 Upper frame 2a Seat board 3, 4 Link member 3a Bracket 3b Guide plate 5 Slot 6 Pump 7 Cylinder 7a Rod 8 Lifting link 9 Lifting operation section

Claims (3)

[Utility model registration claims] 1. A lower frame mounted on an installation surface and serving as a base, an upper frame supporting a seat of a chair, and an upper and lower frame pivotally mounted between the upper and lower frames so as to move up and down in parallel. A parallel link mechanism, a pump that supplies pressure oil each time the operation pedal is depressed, an operating cylinder that raises a rod with the supplied pressure oil, a lifting link that moves up and down by moving the rod up and down, and an upper end of the lifting link A hydraulic pressure unit comprising a lifting / lowering operating portion integrally provided with the upper frame, a release lever for draining pressure oil from the working cylinder to the pump side and lowering the rod, and the operation pedal always upward. A lifting chair comprising: urging means for urging. 2. A pair of parallel link mechanisms are disposed on both sides of the upper and lower frames in the front-rear direction or the left-right direction, and a hydraulic unit is provided at the center. The parallel link mechanism is pivotally mounted at the center to form an X-shape. It is composed of intersecting link members, and a pair of upper and lower receiving plates for pivotally connecting one end of the link member is provided on one side of the front and rear of the upper and lower frames, and extends horizontally on the other side of the front and rear of the upper and lower frames. A pair of upper and lower guide plates having a long hole are provided, and one end side of the link member is pivotally attached to the receiving plate, and the other side of the link member is slidable along the long hole of the guide plate. When the upper frame is lifted, the linking position on the other side of the link member approaches the pivoting position on one side to guide the upper frame to the upwardly separated position. On the other side of the member Lift chair seat according to claim 1, characterized in that the wearing position becomes to guide to a position approaching the upper frame to the lower frame away from the pivot position of one side. 3. The lifting device according to claim 2, wherein a bottom substrate fixed above the lower frame is held in a hollow position, and a lower portion of the hydraulic unit is fixed on the bottom substrate. Chair.