JP4198029B2 - Chair and armrest device thereof - Google Patents

Description

  The present invention relates to a chair and an armrest device thereof.

  An armrest device for a chair generally includes an elbow post disposed on the left and right sides of a seat and an elbow rest on which an elbow of a seated person is placed, and there is an apparatus that can adjust the height of the elbow rest.

In an armrest device that can adjust the height of the armrest, for example, as disclosed in Patent Document 1, generally, a cylindrical outer case with an armrest attached is fitted to the elbow strut so that it can be raised and lowered, and a lock mechanism is provided inside the outer case. Furthermore, the operation button for unlocking is exposed from the hole formed in the front surface of the outer case.
JP 2002-51869 A

  When adjusting the height of the elbow rest, the outer case should be lifted and lowered while holding the outer case while holding the finger on the operation button and pulling the operation button with the finger. And the small area that the finger takes on the operation buttons, the burden on the finger is heavy and sometimes pain is felt.

In addition, when a person adjusts the height of the elbow rest while sitting, it is unnatural to keep pulling a small operation button with a finger (keep pushing) because the wrist is in a diagonally downward position. For this reason, it was difficult to adjust the height of the elbow rest.

  An object of the present invention is to improve such a current situation.

According the invention of claim 1 relates to an armrest device, the armrest support is disposed on the side of the seat, a lifting unit which is mounted in a freely height adjustment to the armrest support, elbow provided on the upper end of the lifting unit includes bets, the elevating unit has a full cylindrical outer case fitted from the outside to the armrest support, the outer casing, the lock is released and the lifting movement seated person with the outer case grips The lever is provided so as to extend long in the vertical direction.

Furthermore, while the front surface of the outer case is open so as to extend vertically, the lever is arranged in a circular arc shape so as to cover the opening of the outer case and extend vertically. When held together with the case, the lock is released by rotating or sliding backward, and the outer case is formed with a step portion into which the side portion of the lever is fitted, As a result, when the lever and the outer case are gripped, the outer peripheral surfaces of the outer case and the lever are smoothly and continuously formed into a cylindrical shape.

The present invention includes a chair provided with the armrest device according to claim 1 as described in claim 2 .

Effects and effects of the invention

  According to the present invention, since the lever for releasing the lock of the height adjusting mechanism extends vertically up and down, the contact area with the seated person's hand is large, and thus the burden on the finger can be eliminated. Further, since the lock can be released by grasping any part of the outer case, the height of the elbow rest can be adjusted by bringing the arm closer to a more natural posture. Together, these two can easily adjust the height of the elbow pads without burden.

Further, since the lever serves as a cover for covering the opening of the outer case, the number of members can be suppressed accordingly, and the operability is further improved because the lever has a large area. Furthermore, since the lever is formed as a unitary structure with the outer case, it can be excellent in design.

  Next, embodiments of the present invention will be described with reference to the drawings.

(1). Summary of the structure of the chair First, an outline of the chair on the basis of FIG. FIG. 1 is a side view of a chair. As shown in FIG. 1, the chair includes a leg 1 with casters, a seat 2, a backrest 3, and an armrest device 4. The leg 1 is provided with a leg support 5 that is freely extendable and rotatable, and a support base 6 is fixed to the upper end of the leg support 5.

  The seat 2 is attached to the seat frame body 8 via the outer shell 7, and the front end portion of the seat frame body 8 can be tilted and retracted backward by the first shaft 9 to the front end portion of the support base 6. Installed.

  In addition, the front end portion of the back frame body 10 is connected to the rear base portion of the support base 6 so as to be able to tilt backward by the third shaft 11, and a back column 12 is provided at the rear portion of the back frame body 10, The backrest 3 is attached to the back column 12.

  Further, a portion of the back frame body 10 behind the third shaft 11 and the rear portion of the seat frame body 8 are connected by a second shaft 13 so as to be relatively rotatable. For this reason, when the backrest 3 tilts backward, the seat 2 also moves backward while tilting back together.

(2). Fixing Elbow Posts As shown in FIG. 2 , the armrest device 4 includes an elbow post 34 made of a round pipe, and the elbow post 34 is a bridge member (not shown) fixed to the back frame body 10. Z) . However, details are omitted.

(3) elevation of. Armrest apparatus Next, an outline of the armrest device 4 on the basis of FIG. 3 the following drawings. Figure 3 is a perspective view of members constituting the lifting unit, FIG 4 is exploded perspective view of members constituting the armrest portion, FIGS. 5 to 12 is a perspective view showing the positional relationship between the assembly procedure of the members, FIG. 13 Among these, (A) is a longitudinal front view of the elevating part, and the partial drawings (B) to (D) are cross-sectional views of the corresponding English character portions of (A). First, the elevating part will be described.

For example, as shown in FIG. 3, the elevating part includes an outer case 41 that is slidably and rotatably fitted to the elbow post 34, and an inner case 42 that is a front and rear split type fitted to the elbow post 34 from the inside. And a hollow elevating cylinder 43 fitted in the hollow portion of the inner case 42, and an engagement rod 44 fitted in the elevating cylinder 43.

The front and rear inner cases 42 are tightly fitted inside the elbow struts 34 so as to overlap each other, and are held so as not to be removed by screws 45 such as countersunk screws (without using fasteners such as screws). to, may be such as snaps by utilizing the elasticity of the claws provided on the inner casing 42.). Further, as shown in FIG. 13 , a large number of engagement holes 47 are formed at appropriate intervals in the inner case 42 located rearward.

For example, as shown in FIG. 13, engaging rod 44 is pivotally supported on the lifting cylinder 43 by a pin 48 to tilt in the longitudinal direction around the upper and lower intermediate portion, and the lower end of the engaging rod 44 A rearward engagement claw 49 is formed in the part, and this engagement claw 49 can be engaged with and disengaged from the engagement hole 47 of the inner case 42 through a window hole formed in the elevating cylinder 43.

As shown in FIGS. 3 and 13, an operating body (button) 50 extending toward the front side is fitted to the upper end of the engagement rod 44, and the operating body 50 is a forward-facing hole provided in the upper end portion of the elevating cylinder 43. It is exposed from 51 to the near side. Further, a pin 52 is provided at the front end of the operating body 50, and the engaging claw 49 of the engaging rod 44 is fitted into the engaging hole 47 by fitting the compression coil spring 53 onto the operating body 50. It is energized to become.

  Therefore, when the operating body 50 is pushed rearward, the engaging rod 44 is rotated, the engaging claw 49 is detached from the engaging hole 47, and the elevating cylinder 43 can be moved up and down.

For example, as shown in FIG. 5, a stopper 54 is attached to the lower end portion of the elevating cylinder 43. The stopper 54 is made of a synthetic resin and includes left and right stopper claws 54 a that can be elastically deformed. The left and right claws 54 a are exposed to the outside from a window hole provided in the lifting cylinder 43.

  The left and right stopper claws 54 a are deformed to escape when the elevating cylinder 43 is fitted into the inner case 42. Further, when the lifting cylinder 43 is once fitted into the inner case 42 and then pulled out, the stopper claw 54a is caught by the locking portion formed on the upper inner surface of the inner case 42, thereby preventing the lifting cylinder 43 from coming off.

  In addition, the stopper claw 54a has a role of preventing the lifting cylinder 43 from rattling when the lifting cylinder 43 is moved up and down, and thus has an advantage of being able to prevent catching during the lifting and lowering.

The outer case 41 is formed in a tapered shape whose diameter increases toward the upper part, and the front surface of the outer case 41 is greatly opened in a range of about two thirds of the upper part (the opening part is denoted by reference numeral 55). Show . )

For example, as shown in FIGS. 3, 10, 11, and 13, a lever 56 having substantially the same length as that of the outer case 41 is disposed on the front surface of the outer case 41, and the lever 56 is provided in the lower portion thereof. By setting the orientation pin portion 57 (see FIG. 13C) in the left and right outward holes 58 provided in the outer case 41, the lever 56 is set to rotate in the front-rear direction around the pin portion 57. ing.

The lever 56 has an arc shape in cross section, and is set so that the lateral width and the curvature increase as it goes upward according to the outer case 41. For this reason, when the lever 56 is gripped and overlapped with the outer case 41, the outer case 41 and the lever 56 are in a state of forming a single cylinder as a whole.

For example, as can be understood from FIG. 13C , the outer case 41 is formed with a flat step portion 59 so that the left and right side portions of the lever 56 are fitted. For this reason, the outer peripheral surface of the outer case 41 and the lever 56 can continue smoothly. The upper end portion of the lever 56 is pushed forward by the operating body 50, and the lower end of the lever 56 contacts the outer case 41, thereby restricting forward tilting.

As can be understood from FIG. 13A , when the outer case 41 and the lever 56 are gripped, the lever 56 is rotated, and the engagement rod 44 is rotated by this rotation, and the engagement claw 49 is engaged. Detach from hole 47.

For example, as shown in FIGS. 3, 5 and 6, the disc 61 is fixed to the upper end of the elevating cylinder 43, while the upper end of the outer case 41 overlaps the disc 61 from below as shown in FIG. 9. An upper plate 62 is integrally formed, and the upper plate 62 is fastened to the disc 61 with screws 63. For this reason, the raising / lowering cylinder 43, the outer case 41, and the lever 56 move up and down integrally. As shown in FIG. 6 (A), outward projections 61a are provided at both front and rear ends of the disc 61, while a recess (not shown) is fitted on the upper inner peripheral surface of the outer case 41. Z).

The elevating cylinder 43 is fitted into the outer case 41 from above. For this reason, the upper plate 62 of the outer case 41 is cut out so that the elevating cylinder 43 can penetrate (see FIG. 9). As shown in FIG. 13A, a lever portion 64 is provided on the inner surface of the upper portion of the lever 56 in close contact with or in contact with the upper portion of the outer case 41. This is mainly provided for securing the strength and for preventing the lever 56 from coming into contact with the inner wall of the outer case 41 (it can also function as a stopper for regulating the opening angle) . .

(4). Elbow rest Next, the elbow rest will be described with reference to FIGS. 14A is a longitudinally separated side view of the armrest portion, and FIGS. 14B to 14D are perspective views of the members.

As shown in FIG. 14 and FIG. 4 , the elbow rest includes an elbow rest 65 constituting the upper end and a lower lid 66 constituting the lower end, and a space between the elbow rest 65 and the lower lid 66. The lower bush 67, the collar 68, the lower metal fitting 69, the left and right sliders 70, the click bush 71, the click spring body 72, the petal spring washer 73, the flat washer 74, and the main screw 75 are protruded in order from the bottom. The upper metal fitting 76 is arranged.

A cushion layer 65a made of a soft resin is integrally formed on the upper surface of the elbow pad 65 by insert molding (separated in FIG. 4 ).

As shown in FIG. 15 , the elbow rest 65 and the lower lid 66 are integrally fixed with screws 77. Further, the lower lid 66 has an elongated hole 78 for allowing the lower lid 66 to slide in the longitudinal direction.

Figure 16 (A) is a longitudinal side view of the elbow portion, FIG. 17 is a XVII-XVII view plan view of FIG. 16 (A). As shown in FIG. 6 , the lower bush 67 is provided with a plurality of downward pin portions 67c, while the disc 61 of the elevating cylinder 43 has a small hole 61b into which the pin portion 67c is fitted.

  Further, a notch 67b that opens upward is formed in the small diameter portion 67a of the lower bush 67, while an inward key portion 71a that fits into the notch 67b is formed on the inner peripheral surface of the rotary bush 71. Therefore, the click bush 71 is held so as not to rotate. Note that other methods may be employed to hold the click bush 71 in a non-rotatable manner. Further, the click bush 71 is not necessarily required, and other retaining means may be employed.

  The lower metal fitting 69 is slidably fitted in the longitudinal direction with respect to the lower lid 66 and cannot be displaced in the width direction, and is held by the click bush 71 so as not to be detached. Therefore, the lower metal fitting 69 can only rotate.

The upper metal fitting 76 is fixed to the lower lid 66 with screws 79 (for example, FIG. 8) . Further, as shown in FIG. 16 , downward claws 65 a formed on the elbow pads 65 are engaged with the left and right side edges of the upper metal fitting 76. In this case, in FIG. 16A , the claw 65a is engaged with the lower end of the side plate 76a, but in FIG. 16B, an engagement hole 76b is formed in the side portion of the upper metal piece 76. In this case, since the length of the claw 65a is shortened, the claw 65a can be prevented from being broken during transportation or the like, and the structure of the molding die is simplified.

Further, in FIG. 16 (B), the which is abutted against the distal end portion 76c of the side plate 76a of the upper fitting 76 on the inner surface of the lower cover 66. For this reason, it is excellent in stability.

For example, as shown in FIG. 4, the upper and lower metal fittings 76 and 69 extend in the front-rear direction, and the lower metal fitting 69 is formed with a flange 69a (see, for example, FIG. 6) extending outward in the left-right direction . The upper metal fitting 76 includes a downward side plate 76 a so as to cover the lower metal fitting 69, and a slider 70 is interposed between the left and right side portions of the upper and lower metal fittings 69, 76.

As shown in FIG. 17 , the slider 70 is held so that it cannot be displaced forward and backward by being fitted to the flange 69 a of the lower metal fitting 69, and includes a spring piece 70 a for stretching between the side plates of the upper and lower metal fittings 69 and 76. ing.

  While the lower metal fitting 69 is not slidable, the elbow rest 65, the lower lid 66, and the upper metal fitting 76 are slidable while being guided by the lower metal fitting 69. A moderate frictional resistance is given to the slide by the slider 70.

  The click bush 71 is held non-rotatable as described above. Further, it is held non-rotatable via a spring washer 72. In addition, recesses (or protrusions) 71 a are formed on the outer periphery of the click bush 71 at appropriate intervals, while a spring body 72 having a protrusion that fits into the recess of the click bush 71 is attached to the lower metal fitting 69.

  For this reason, when the elbow rest 65 is rotated, the projection 72a of the spring body 72 is fitted into and removed from the recess 71a of the click bush 71, so that the posture is maintained and the click feeling can be received every time the elbow rest 65 rotates by a certain angle. Further, since a downward pressing force is applied to the lower metal fitting 69 by the spring washer 73 via the click bush 71, an appropriate resistance is applied to the sliding and turning of the elbow rest 65.

(5). Others Although the embodiment of the present invention has been described above, the present invention can be embodied in various aspects other than the above-described embodiment. For example, lever is not revolvable, it is also possible to longitudinal sliding. The lift lock mechanism can be of various principles.

  The elbow rest may be fixedly provided on the elevating part, or may be attached so as to perform other movements such as swinging up and down and sliding left and right. Note that the lever does not necessarily have the same dimensions as the outer case, and is sufficient if the occupant can operate the arm without placing the arm in an unreasonable posture. It can be said that a height of about two is sufficient. The width dimension is preferably the same as the width of the outer case.

It is a side view of the chair concerning an embodiment. It is a perspective view of an armrest device. It is a perspective view of the member which comprises an raising / lowering part. It is a separation perspective view of the member which constitutes an elbow rest part. It is a perspective view which shows the 1st process of an assembly. It is a perspective view which shows the 2nd process of an assembly. It is a perspective view which shows the 3rd process of an assembly. It is a perspective view which shows the 4th process of an assembly. It is a perspective view which shows the 5th process of an assembly. It is a perspective view which shows the 6th process of an assembly. It is a perspective view which shows the 7th process of an assembly. It is a perspective view which shows the 8th process of an assembly. (A) is a longitudinal front view of the elevating part, and the partial drawings (B) to (D) are cross-sectional views of the corresponding alphabetical characters in (A). (A) is a longitudinally separated side view of the elbow rest, and (B) to (D) are perspective views of the members. It is sectional drawing which shows the relationship between an elbow rest and a lower cover. It is a vertical front view of an elbow rest part. It is the XVII-XVII view top view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 Armrest apparatus 34 Elbow support | pillar 41 Outer case which forms a part of raising / lowering part 42 Inner case 43 Lifting cylinder 44 Engagement rod 55 Opening part 56 of outer case 56 Lever
57 Inward pin that becomes the pivot center of the lever
58 Outer case outward hole
59 Outer case step 65 Elbow rest 66 Lower lid

Claims (2)

And armrest support which is disposed on the side of the seat, a lifting section height adjustably mounted to the armrest support, and a elbow stay provided at the upper end of the elevating section, the lift portion on the armrest support includes a full cylindrical outer case fitted from the outside, the outer casing is provided with a lever to which the outer case and the seated person together with the lifting and lowering gripping the lock is released, so as to extend longer in the vertical direction ing,
In addition,
While the front surface of the outer case is open so as to extend vertically, the lever is arranged in a circular arc shape so as to cover the opening of the outer case and extend vertically. When held together, the lock is released by rotating or sliding backward, and the outer case is formed with a step portion into which the side portion of the lever is fitted. When the lever and the outer case are gripped, the outer peripheral surface of the outer case and the lever smoothly and continuously forms a cylinder shape.
Is supposed to
Chair armrest device. A chair provided with the armrest device according to claim 1.

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