JPS5832700Y2 - chair - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a chair with armrests.

More specifically, the present invention relates to a seat chair in which the back part can be swung upright at a desired angle relative to the seat part, and the armrests can be raised to the use position as the back part is swung.

A conventional seat chair with armrests includes a back frame that is pivotably connected to a seat frame, a rocking position of the back frame relative to the seat frame can be locked, and the seat A free end of a support rod pivotally connected to the side of the frame and a free end of an arm rod pivotally connected to the side of the back frame are pivotally connected to each other, and an armrest is mounted on the upper arm rod. ing.

By the way, in order to pivotally attach the support rod and arm rod to each frame, an L-shaped mounting bracket having a through hole is provided in the pivot portion of each frame, and the end portions of the support rod and arm rod on the pivot side are bent. However, this bent part is made into a stepped shape and its tip is inserted into the through hole for support, but with this structure, an uneven load is applied to the armrest in the vertical or horizontal direction, and the uneven load is applied to the bent end. When acting on the one through hole through the
Otherwise, there was a problem that they were damaged and could not withstand long-term use.

Therefore, the present invention was devised to solve such problems, and the pivot points of the support rods and arm rods in each frame are provided with:
A reinforcing tube with a large diameter portion at the middle portion is inserted and fixed, and a through hole is formed in the pivot joint portion of each frame, and a large diameter hole and a small diameter hole that are connected to the through hole are formed in the large diameter portion. On the other hand, the pivot side ends of the support rod and the arm rod are bent, and the bent ends are stepped and the tips thereof have a small diameter, and the bent ends are made larger than the large diameter part. It is characterized in that it is inserted from the diameter hole through the through hole and into the small diameter hole, and is supported at four locations by the large diameter hole, the through hole, and the small diameter hole.

Embodiments of the present invention will be described below based on the drawings.

In the figure, 1 is a seat frame formed by bending a pipe material into a U-shape, and 2 is a back frame formed in the same way. , 3, a back frame 2 is pivotally connected to the seat frame 1.

As a result, the seat frame 1 and the back frame 2 can swing around the pivots 3a, 3a of the reclining mechanisms 3, 3, and the back frame 2 moves from the unfolded state to the front side (seat frame When the back frame 2 is free to swing toward the 1 side) and the swing toward the rear side (deployment direction) is locked, and the bending angle of the back frame 2 with respect to the seat frame 1 exceeds 90°, the back frame 2 It is constructed so that the swinging lock toward the rear side is released.

A reclining mechanism having such an effect is already well known, and a detailed explanation of its structure will be omitted.

Thus, the side frames 1 and 2 are entirely covered with a cushioning material 4 such as urethane foam, and the cushioning material 4 is wrapped with cloth 5.
A pair of support rods 6, 6 are pivotally attached to the middle of opposing circumferential sides of the back frame 2 so as to be pivotable about axes extending in the same direction as the pivots 3a, 3a. A pair of arm rods 7, 7 are provided in the middle of the circumferential sides facing each other.
The armrests 8, 8 are mounted on the arm rods 7, 7 with the fasteners 9, 3a pivotably mounted on the armrests 7, 7 so as to be pivotable about an axis extending in the same direction as the armrests 9, 3a.
9 and 10 degrees 10, and each free end of the support rods 6, 6 is fixed to the free end side stopper 10.10 of the arm rods 7, 7 with a pole extending in the same direction as the pivot shafts 3a, 3a. ) 11.
11 and oak) 12. Pivotally attached to be able to swing by 12,
The armrest 8° 8 is configured to rise and fall as the back frame 2 swings relative to the seat frame 1.

In this way, from the pivoting position of the support rods 6, 6 to the seat frame 1 to the pivoting position of both frames 1, 2, that is, the pivots 3a, 3
In contrast to the straight line length 11+12 in the figure passing through a to the position where the arm rods 7, 7 are pivotally attached to the back frame 2, the length of the straight line from the position where the support rods 6, 6 are pivotally attached to the seat frame 1 is 6,
6 arm rod 7, pivot position to the 7 side (i.e. pole) 11.1
1 to the position where the arm rods 7, 7 are pivotally attached to the back frame 2 (13+14) in the figure.

As a result, when the back frame 2 is in the unfolded state relative to the seat frame 1, the armrests 8, 8 fall down along both frames 1, 2, and the back frame 2 is extended relative to the seat frame 1.
When the armrests 8 and 8 are swung upright, the armrests 8 and 8 are attached to the seat frame 1.
It rises to the use position while maintaining a state approximately parallel to the surface.

The structure of the pivot joints of the support rods 6, 6 to the seat frame 1 and the structure of the pivot joints of the arm rods 7, 7 to the back frame 2 are as follows. A pivot point to the back frame 2 will be explained as an example.

That is, as shown in FIG. 3, a steel pipe with a diameter larger than that of the back frame 2 is used, and both ends of the steel pipe are drawn to fit the outer diameter of the back frame 2, so that the middle part is a reinforced pipe with a larger diameter. 13, and this reinforcing tube 13 is attached to the back frame 2.
The through hole 2 is inserted into the side part of the back frame 2 and
a, 2b, and the through holes 2a, 2b in the large diameter part.
A large-diameter hole 13a and a small-diameter hole 13b are provided oppositely, and the end of the arm rod 7 on the pivot side is bent at a right angle, and this bent end is stepped, and the tip thereof is formed with a small diameter. and a threaded portion 7a is formed at the tip, and the bent end of the upper arm rod 7 is
The large diameter hole 13a formed in the reinforcing tube 13 is inserted into the small diameter hole 13b formed in the reinforcing tube 7 via the through holes 2a and 2b formed in the back frame 2.
A nut 14 is screwed into the threaded portion 7a of the arm rod 7 protruding from b, and the arm rod 7 is attached to the back frame 2 by tightening the nut 14, whereby the arm rod 7 is fitted into the large diameter hole. 13a, small diameter hole 13b through hole 2a, 2b
It is supported with less rattling at these four locations.

The chair of the present invention is constructed as described above, and when in use, the back frame 2 is swung forward from the unfolded state with respect to the seat frame 1, and the back frame 2 is erected at a desired angle. At this time, the rearward swinging of the back frame 2 is locked, and the user can lean on the back frame 2.

In addition, as the back frame 2 swings forward, the armrests 8, 8 rise to the use position, and the armrests 8, 8
are substantially parallel to the seat frame 1, and the user can rest his arms on these armrests 8, 8.

In addition, when not in use, the back frame 2 is replaced with the seat frame 1.
After the back frame 2 is swung forward until it exceeds 90', the back frame 2 is swung rearward again to unfold the back frame 2 relative to the seat frame 1. 2, the armrests 8, 8 fall down along both frames 1, 2, and as a whole, the seat frame 1, the back frame 2, and the armrests 8, 8 are collapsed.
It has a flat plate shape and can be stored without being bulky.

As explained above, in the seat according to the present invention, a reinforcing tube with a large diameter portion in the middle is inserted and fixed into the pivot joints of the support rods and arm rods in the seat frame and the back frame. A through hole is provided in the pivot portion, and a large diameter hole and a small diameter hole that join the through hole are provided in the large diameter portion, and the ends of the support rod and the arm rod on the pivot attachment side are bent. , the bent end is stepped and the tip thereof has a small diameter, and the bent part is inserted from the large diameter hole of the large diameter part to the small diameter hole via the through hole, and the large diameter hole and the through hole are inserted. Since it is characterized by being supported at four places by holes and small diameter holes, the bent ends of the arm rod and the support rod can be connected to the through holes provided in the respective pivot parts of the seat part and the back frame. Instead of supporting only the frame, it is supported at four locations by the large diameter hole and small diameter hole of the reinforcing pipe inserted and fixed in the pivot joint part of each frame, and the middle part of the reinforcing pipe is the large diameter part, and the Since the large and small diameter holes are provided oppositely in the diameter portion, the distance between the supporting portions of the bent end portion can be increased to support the bent end portion stably, reliably and firmly, and thereby, Even if an unbalanced load is applied to the armrest in the vertical or horizontal direction and this unbalanced load acts on the support section through the bent end, this unbalanced load can be removed by
It can be reliably received by the supporting portion at each location, and therefore, the through hole can be used for a long period of time without the risk of being deformed or damaged by the uneven load.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway side view thereof, FIG. 2 is a plan view with the same portion omitted, and FIG. 3 is a partially enlarged sectional view. 1...Seat frame, 2...Back frame, 4...Cushion material, 6...Support rod, 7...Arm rod , 8...Armrest.

Claims (1)

[Scope of utility model registration request] The back frame is pivotably connected to the seat frame, and the swing position of the back frame with respect to the seat frame can be locked, and the support rod is pivotally connected to the side of the seat frame. In a seat chair in which a free end portion and a free end portion of an arm rod pivotally connected to a side portion of the back frame are mutually connected, and an armrest is attached on the arm rod, the support rod and A reinforcing tube with a large diameter portion at the middle portion is inserted and fixed into the pivot portion of the arm rod, and a through hole is formed in the pivot portion of each frame, and the large diameter portion is connected to the through hole. A large diameter hole and a small diameter hole are provided oppositely to each other, and the pivot side ends of the support rod and arm rod are bent, and the bent ends are stepped, and the tips thereof have a small diameter. The chair is characterized in that the part is inserted from the large diameter hole of the large diameter part into the small diameter hole via the through hole, and is supported at four locations by the large diameter hole, the through hole, and the small diameter hole. .