JP7145401B2 - table latch mechanism - Google Patents

Description

The present invention relates to a table latch mechanism. More specifically, it relates to a table latch mechanism for latching a table on the back of the seat back.

Patent Literature 1 discloses a configuration in which a table that can be used by a rear seat occupant is provided on the back portion of the seat back of an aircraft seat. The table is attached to a pair of left and right arms projecting from the seat back to the back side of the back. The table can be switched between a deployed position in which the table is laid down substantially horizontally on the back side of the seat back and a retracted position in which the table is folded on the back side of the seat back. On the back of the seat back is provided a rotary table latch mechanism that is hooked from above to the table folded on the back of the seat back to restrict the unfolding of the table.

Japanese Patent Application Laid-Open No. 2006-282132

The table latch mechanism is preferably provided so that the mounting structure is not exposed to the outside from the viewpoint of appearance, etc., and it is difficult to provide a structure that is easy to mount and remove and excellent in maintainability. Accordingly, the present invention provides a table latch mechanism that is easy to install and remove.

In order to solve the above problems, the table latch mechanism of the present invention employs the following means.

That is, the table latch mechanism of the present invention is a table latch mechanism for latching a table on the back of a seat back, and comprises a base fixed to the back of the seat back and a base attached to the back of the seat back to latch the table. a latch portion rotatably supported at a first rotational position and a second rotational position for releasing the latch. The latch portion extends from the back side to the front side of the base through a shaft portion that serves as a rotating shaft that passes through a through hole formed in the base portion from the back side, and a notch that protrudes radially from the shaft portion and extends radially from the through hole. and an overhang that is threaded through. The base part is rotatably connected to the surface part of the base part, and the open position allows the overhang part to pass through the notch from the back side to the front side, and the overhang that closes the notch from the front side and passes through the notch. It has a closure that can be rotated to and from a closed position that restricts withdrawal to the back side of the part.

According to the above configuration, the latch portion can be easily attached to and detached from the base portion fixed to the back portion of the seat back. That is, when attaching the latch portion to the base, the fastener is set to the open position, and after passing the shaft portion and overhanging portion of the latch from the back side to the front side through the through hole and the notch of the base, the fastener to the closed position. Further, when the latch portion is removed from the base portion, the fastener is switched to the open position, and the projecting portion of the latch is pulled out through the notch in the base portion to the front side.

Moreover, the table latch mechanism of the present invention may be further configured as follows. A base is secured to the frame of the seat back.

According to the above configuration, the latch portion can be independently attached to or removed from the base without removing other accessories. In other words, if the base is fixed to other equipment that is attached to the seat back frame, it may be difficult to reach the fasteners until the other equipment is removed from the seat back frame. . However, by fixing the base to the frame of the seat back, the latch can be easily attached to or removed from the base by itself.

1 is a perspective view showing a schematic configuration of a table latch mechanism according to a first embodiment; FIG. It is a perspective view showing rotation operation of a latch part. FIG. 4 is an exploded perspective view with the latch section removed from the base; FIG. 4 is an exploded perspective view of FIG. 3 as seen from the front side; It is a perspective view showing the state where the latch part was inserted in the base. FIG. 6 is a perspective view showing a state in which the latch part is rotated from FIG. 5 to a second rotation position; FIG. 7 is a perspective view showing a state in which the fastener has been switched to the closed position from FIG. 6; FIG. 8 is a perspective view showing a state in which the latch part is rotated to a first rotation position from FIG. 7;

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

<<1st Embodiment>>
(Regarding the schematic configuration of the table latch mechanism 4)
First, the configuration of the table latch mechanism 4 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8. FIG. In the following description, when directions such as front, back, up, down, left, and right are indicated, they refer to the respective directions shown in the respective drawings.

As shown in FIG. 1, a table latch mechanism 4 according to this embodiment is applied to an aircraft seat 1. As shown in FIG. The seat 1 has a seat back 2 forming a backrest portion for a seated person, and a seat cushion (not shown) forming a seating portion. A table 3 that can be unfolded and used by a rear seat occupant is provided on the back portion of the seat back 2 .

The table 3 can be switched between a deployed position in which it is used by laying it almost horizontally behind the back of the seat back 2, and a retracted position in which it is folded in a superimposed manner on the back of the seat back 2. be. A rotary operation type latch mechanism is provided on the back portion of the seat back 2, which is hooked from the upper side to the table 3 folded on the back portion to restrict its unfolding.

The latch mechanism, as shown in FIGS. and a latch part 20 attached to the base part 10 from the back side and rotatably supported. As shown in FIG. 4, the latch portion 20 includes a latch main body 21 that serves as a grip portion, a shaft portion 22 that forms a rotation shaft of the latch main body 21, and straight lines on both sides in the radial direction attached to the tip of the shaft portion 22. and a compression spring 24 passed through the shaft portion 22.

The shaft portion 22 is shaped like a round pin and protrudes forward from the front surface portion of the latch body 21 . The protruding portion 23 is made of a single elongated plate-like member, and is radially inserted into and integrated with the tip of the shaft portion 22 . The compression spring 24 has a coiled shape, and is passed through the shaft portion 22 from the front before the projecting portion 23 is inserted into the shaft portion 22 . After passing through the shaft portion 22 , the compression spring 24 is wound in the area between the latch main body 21 and the overhang portion 23 of the shaft portion 22 by inserting the overhanging portion 23 into the tip of the shaft portion 22 . It is assumed to be in a state where it is installed.

The base 10 consists of one resin plate member. The base portion 10 includes a circular through hole 11 through which the shaft portion 22 of the latch portion 20 can be inserted from the rear, and a notch 12 cut in a shape extending straight in the left-right direction through the through hole 11. and a pair of left and right metal fasteners 13 provided on both left and right sides of the notch 12. - 特許庁

The through hole 11 is formed through the center of a base 10B which is formed in the center of the surface portion 10A of the base portion 10 and protrudes forward in a substantially cylindrical shape. The through hole 11 has a hole shape that allows the tip of the shaft portion 22 to pass through to the front side of the pedestal 10B by passing the shaft portion 22 of the latch portion 20 from behind (see FIG. 5). As shown in FIG. 4, the notch 12 has a hole shape that communicates with the through hole 11 and widens the hole shape in the left-right direction into a slit shape.

When the shaft portion 22 of the latch portion 20 is passed through the through hole 11 from behind, the notch 12 is formed by aligning the direction of the projecting portion 23 at the tip of the shaft portion 22 with the shape of the hole and passing it from the rear. 23 has a penetrating shape that allows it to pass through to the front side of the pedestal 10B (see FIG. 5). As shown in FIG. 4, the pair of left and right fasteners 13 are separately provided on the right side and the left side of the base 10B. These fasteners 13 are configured to be integrally fixed by being fastened on the surface portion 10A of the base portion 10 by a fastening shaft 13A made of metal.

When the latch portion 20 is attached to the base portion 10 and when the latch portion 20 is removed from the base portion 10, each fastener 13 is loosened by the operation of loosening the fastening of each fastening shaft 13A. is held at the open position Q1 away from the In this state, each fastener 13 is in a state in which the projecting portion 23 of the latch portion 20 is allowed to move through the notch 12 from behind.

However, each fastener 13, as shown in FIG. 7, after the shaft portion 22 and overhanging portion 23 of the latch portion 20 are respectively passed through the through hole 11 and the notch 12 of the base portion 10, each fastening shaft 13A is By tightening using the illustrated fastening tool, the notch 12 on each side is switched from the front side (front side) to the closed position Q2. As a result, each fastener 13 can be prevented from moving rearwardly through the notch 12 even when the latch portion 20 is switched to a rotational position in which the overhang 23 is aligned with the notch 12 as shown in FIG. It will be in a state where it is possible to prevent the movement to be removed.

Specifically, as shown in FIG. 5 , each fastener 13 is loosened from the tightened state, and frictional engagement associated with metal-to-metal pressing between each fastening shaft 13A and each fastening shaft 13A is performed. It is integrated with the fastening shaft 13A and is moved to the open position Q1 while sliding in the counterclockwise direction in the drawing with respect to the base 10 made of resin. Further, as shown in FIG. 7, each fastener 13 is integrated with each fastening shaft 13A by frictional engagement caused by metal-to-metal pressing with each fastening shaft 13A due to the operation of tightening each fastening shaft 13A. It is moved to the closing position Q2 while sliding clockwise in the drawing relative to the base 10 made of resin.

Each fastener 13 is turned in the clockwise direction in the drawing by tightening each fastening shaft 13A, and is abutted against and locked to the pedestal 10B at the closed position Q2 where the cuts 12 on each side are closed. It's like

In the table latch mechanism 4 configured as described above, the latch portion 20 is attached to the base portion 10 as follows. As shown in FIG. 4, when attaching the latch portion 20 to the base portion 10, each fastener 13 shall be switched to the open position Q1 outside the formation region of each notch 12. As shown in FIG. From the above state, first, in order to pass the shaft portion 22 of the latch portion 20 through the through hole 11 of the base portion 10 , the orientation of the projecting portion 23 of the latch portion 20 is aligned with the orientation of the notch 12 of the base portion 10 .

In this embodiment, when the latch portion 20 is oriented to the second rotational position P2 extending leftward from the shaft portion 22, the orientation of the projecting portion 23 is aligned with the orientation of the notch 12. . The direction of the projecting portion 23 is aligned with the direction of the notch 12 even when the latch portion 20 is rotated to extend rightward from the shaft portion 22 .

Next, the shaft portion 22 and the protruding portion 23 of the latch portion 20 are passed through the through hole 11 and the notch 12 of the base portion 10 from the rear side to the front side (see FIG. 5). Thereby, as shown in FIG. 4 , the compression spring 24 wound around the shaft portion 22 of the latch portion 20 is pressed against the rear surface portion (rear surface portion) of the base portion 10 . As a result, an elastic force is applied between the rear surface of the base 10 and the front surface of the latch body 21 in the direction in which the latch 20 is pulled out rearward from the base 10 by the action of the spring force of the compression spring 24 . state.

Next, the latch portion 20 passed through the base portion 10 is turned downward to the first rotational position P1 with the shaft portion 22 as a fulcrum against the elastic force of the compression spring 24 (see FIG. 4). (See Figure 6). As a result, the protruding portion 23 is moved to a rotational position out of the formation region of the notch 12 , so that it is in an orientation state in which it is difficult to come out of the notch 12 rearward.

The latch portion 20 is in a state in which sliding friction is imparted so that the projecting portion 23 is always pressed onto the pedestal 10B of the base portion 10 by the action of elastic force applied from the compression spring 24 (see FIG. 4). . As a result, the operation of rotating the latch portion 20 with respect to the base portion 10 is imparted with a moderate sliding resistance and a click feeling.

Here, one piece (upper piece in FIG. 6) projecting radially from the shaft portion 22 of the projecting portion 23 is larger rearward than the other piece (lower piece in FIG. 6). It has a protruding shape. In addition, in the pedestal 10B of the base 10, the upper semi-cylindrical portion bounded by the notch 12 has a lower bulging height forward than the lower semi-cylindrical portion. 5 from the second rotational position P2 shown in FIG. 5 to the first rotational position P1 shown in FIG. It cannot be turned in the opposite direction from the rotational position P2.

That is, when the latch portion 20 is about to be rotated counterclockwise in the drawing from the second rotation position P2 shown in FIG. This is because the movement of the base 10 is restricted by contact with the greatly protruding lower semi-cylindrical portion of the pedestal 10B.

Next, as shown in FIG. 6, from the state in which the latch portion 20 is turned downward to the first rotational position P1, each fastening shaft 13A is tightened to switch each fastener 13 to the closed position Q2 (see FIG. 6). 7). This causes each fastener 13 to close the notch 12 in the base 10 . As a result, even when the latch portion 20 is rotated to the second rotational position P2 where the overhanging portion 23 and the notch 12 are aligned as shown in FIG.

By the above assembly, the latch portion 20 is supported so as to be switchable between the first rotational position P1 and the second rotational position P2 with respect to the base portion 10, as shown in FIG. When the latch portion 20 is switched to the first rotation position P1, the latch body 21 (see FIG. 2) is hooked, and the table 3 (see FIG. 1) is latched in a state where the expansion is restricted.

Further, as shown in FIG. 2, the latch part 20 is switched to the second rotational position P2, thereby moving the latch body 21 away from the upper rear surface of the table 3 described above with reference to FIG. reference) is released. Note that the procedure for removing the latch portion 20 from the base portion 10 is the reverse of the procedure for attaching the latch portion 20, so the description thereof will be omitted.

(summary)
In summary, the table latch mechanism 4 according to this embodiment has the following configuration. That is, the table latch mechanism (4) for latching the table (3) to the back of the seat back (2) comprises a base (10) fixed to the back of the seat, and a base (10) fixed to the back of the seat. It has a latch part (20) that is rotatably supported in a first rotational position (P1) that is attached to latch the table (3) and a second rotational position (P2) that releases the latch.

The latch portion (20) has a shaft portion (22) which serves as a rotation shaft and is passed through the through hole (11) formed in the base portion (10) from the rear side of the back. and an overhang (23) passed from the back side to the front side of the base (10) through a notch (12) radially extending from the hole (11).

An open position in which the base (10) is rotatably connected to the surface (10A) of the base (10) and the overhang (23) is allowed to move through the notch (12) from the dorsal back side to the front side. (Q1) and a closed position (Q2) in which the notch (12) is closed from the front side and the overhang (23) through the notch (12) is restricted from being pulled out to the back side by rotation. a fastener (13).

According to the above configuration, the latch portion (20) can be easily attached to or detached from the base portion (10) fixed to the back portion of the seat back (2). That is, when attaching the latch part (20) to the base (10), the fastener (13) is set to the open position (Q1), and the through hole (11) and the notch (12) of the base (10) are latched. After passing the shaft portion (22) and the projecting portion (23) from the back side to the front side, the fastener (13) can be switched to the closed position (Q2). Also, when the latch part (20) is removed from the base part (10), the fastener (13) is switched to the open position (Q1), and the overhang part (23) of the latch is pushed into the notch (12) of the base part (10). ) to the front side.

Also, the base (10) is fixed to the frame (2F) of the seat back (2). According to the above configuration, the latch part (20) can be independently attached to or removed from the base (10) without removing other accessories. That is, when the base (10) is fixed to other equipment attached to the frame (2F) of the seat back (2), the other equipment must be removed from the frame (2F) of the seat back (2). , it may become difficult to reach the fastener (13). However, by fixing the base (10) to the frame (2F) of the seat back (2), the latch part (20) can be easily attached to or removed from the base (10) alone.

<<About other embodiments>>
As described above, the embodiment of the present invention has been described using one embodiment, but the present invention can be implemented in various forms shown below in addition to the above embodiment.

1. INDUSTRIAL APPLICABILITY The table latch mechanism of the present invention can be widely applied not only to aircraft seats but also to seats for various vehicles such as automobiles, railroad vehicles, and ships. The harness bracket can also be widely applied to non-vehicle seats installed in facilities such as movie theaters and stadiums.

2. The protruding portion radially protruding from the shaft portion of the latch portion may protrude only in one radial direction from the shaft portion. Moreover, the protruding portion may protrude in three or more radial directions from the shaft portion. In that case, the notches formed in the base and the fasteners closing the notches are formed corresponding to the form of the projecting portion.

3. The latch portion may have a configuration in which the shaft portion and the projecting portion are passed through the through hole and the notch of the base portion in any rotational orientation. That is, the latch portion may be passed through the base portion in a direction that is not limited to the first rotational position or the second rotational position, but in any other rotational position.

4. The base may be configured to be fixed to the frame of the seat back or to an accessory attached to the same frame.

1 seat 2 seat back 2F back frame (frame)
3 Table 4 Table Latch Mechanism 10 Base 10A Surface 10B Base 11 Through Hole 12 Notch 13 Fastener 13A Fastening Shaft 20 Latch Part 21 Latch Main Body 22 Shaft 23 Overhang 24 Compression Spring P1 First Rotation Position P2 Second Rotating position Q1 Open position Q2 Closed position

Claims (2)

A table latch mechanism for latching a table on the back of the seat back,
a base fixed to the back portion;
a latch part attached to the base from the back side and rotatably supported at a first rotation position for latching the table and a second rotation position for releasing the latch;
The latch portion has a shaft portion which is a rotation shaft passed from the back side through a through hole formed in the base portion, and a notch projecting radially from the shaft portion and extending radially from the through hole to the base portion. and an overhang that passes from the back side to the front side,
The base portion is rotatably connected to the surface portion of the base portion, and an open position in which the overhang portion is allowed to pass through the cut from the back side to the front side, and an open position in which the cut is closed from the front side to close the cut. A table latch mechanism having a fastener that can be switched between a closed position and a closed position that restricts the pulling out of the overhanging portion through the notch toward the back side of the spine by rotation. 2. The table latch mechanism of claim 1, comprising:
A table latch mechanism in which the base is fixed to the frame of the seat back.

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