JP2008259613A - Furniture with backrest - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a furniture with backrest which is excellent in strength and durability, has a light-weight and compact angle adjuster, and can be finely adjusted in angle. <P>SOLUTION: In the furniture with a backrest part which can be tiled to the front and back by the angle adjuster 14, the angle adjuster 14 includes an arm member 1 connected to the support frame of the backrest part, a gear part 4 formed integrally at the arm member 1, and a pawl member 6 locked to the gear part 4 so as to be freely engaged and disengaged for blocking backward tilting of the backrest part. The pawl members 6 has a plurality of tooth parts 6a locked to the gear part 4 at the end so as to be freely engaged and disengaged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to furniture with a backrest capable of adjusting the angle of the backrest.

  For example, conventional furniture with a backrest such as a chair having a backrest and a seat includes a metal fitting having an angle adjustment function between the backrest and the seat so that the inclination angle of the backrest can be adjusted. This angle adjuster locks the claw pieces on the gear teeth of the ratchet gear member and restricts the backrest portion from tilting backward with respect to the seat portion (see Patent Document 1).

However, the force applied to the gear teeth and the nail piece supports the human weight, and a very large force acts. Therefore, in order to increase the contact area between the gear teeth and the claw pieces to reduce the surface pressure, the claw pieces are enlarged and the gear teeth of the ratchet gear portion are enlarged.
Japanese Utility Model Publication No.59-20118

  The problem to be solved is that the force applied to the claw pieces and the gear teeth is increased, so that the claw pieces and the gear teeth need to be enlarged and the gear teeth pitch needs to be increased. As a result, the angle adjustment step number of the backrest portion is reduced. Thus, the backrest angle could not be finely adjusted. (In a normal chair, the number of angle adjustment steps to tilt backward is about 4 to 6.) Also, as the size of the claw pieces and gear teeth increases, the angle adjustment fittings are large and heavy. Is a point.

  Then, this invention is excellent in intensity | strength and durability, and it aims at provision of the furniture with a backrest which can adjust the angle finely provided with the lightweight and compact angle adjustment tool.

  Therefore, the furniture with a backrest according to the present invention is an furniture having a backrest that can be tilted back and forth by an angle adjuster, and the angle adjuster is connected to the support frame of the backrest; A gear portion formed integrally with the arm member; and a claw member that is detachably engaged with the gear portion to prevent the backrest from tilting backward, and the claw member is attached to the gear portion. It has a plurality of teeth at the tip that are detachably locked.

  In addition, an operation lever having a rotating small roller that contacts the back surface of the claw member opposite to the front surface having the plurality of tooth portions and presses the claw member against the gear portion is provided.

  Also, a sheet metal holding member provided in a seat frame and having a storage space that can store the claw member and the gear portion, and a spiral that elastically urges the arm member in a direction that always swings forward. A spring, and pivotally attaching the arm member and the holding member to lock the outer end locking portion of the spiral spring to the arm member, and bending a part of the holding member The inner end locking portion of the spiral spring can be locked to the protruding locking piece, and the spiral spring is formed by hollowing out the vicinity of the center portion to form the inner end locking portion.

  In addition, the operation lever has a torsion spring that can be locked at one end, and the arm member and the operation lever are pivotally attached to the upright piece that is bent and protruded from the holding member. The other end of the torsion spring is locked, and the elastic lever is urged so as to press the rotating small roller of the operating lever against the claw member, and the swinging of the operating lever is restricted by the standing piece. It is composed.

  Further, the pivot point of the claw member is closer to the gear part than the tangent line of the pitch circle of the gear part passing through the contact point between the tooth part at the center of the plurality of tooth parts and the gear part. Is provided.

  According to the furniture with a backrest of the present invention, since the claw member has a plurality of teeth at the tip, which are detachably engaged with the gear portion, the force applied to the claw member (to prevent tilting) is applied to the plurality of teeth. The force applied to each tooth portion can be reduced. That is, the gear portion and the claw member can be reduced in size and weight. Furthermore, since the gear teeth of the gear portion can be reduced and the number of gear teeth can be increased, the angle of the backrest portion can be finely adjusted. In addition, since the operation lever having the small rotating roller that presses the claw member is provided, the claw member can be reliably locked to the gear portion. In addition, since the inner end locking portion of the spiral spring can be locked to the locking piece that is formed by bending a part of the holding member, a separate locking component for the inner end of the spiral spring is required. Therefore, the number of parts can be reduced. Moreover, since it forms so that the center part vicinity of a spiral spring may be hollowed out, it can reduce in weight. Further, since the other end of the torsion spring is locked to the upright piece formed by bending and projecting a part of the holding member, the other end locking part for the torsion spring is not required, and the number of parts can be reduced. Furthermore, since the swing of the operation lever is configured to be restricted by the standing piece, the number of parts can be reduced without requiring a restriction member. Further, the pivot point of the claw member is disposed closer to the gear part than the tangent line of the pitch circle of the gear part passing through the contact point between the tooth part at the center of the plurality of tooth parts and the gear part. Therefore, even if an external force that causes a large fall acts on the backrest portion, the tooth portion of the claw member is reliably kept in a locked state (without coming off).

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
FIG. 1 is a perspective view showing an embodiment of furniture with a backrest according to the present invention.
In FIG. 1, reference numeral 17 denotes a backrest portion, which comprises a support frame 19 formed by bending a metal pipe member into a U-shape and welding a reinforcing member. Reference numeral 18 denotes a seat corresponding to the backrest 17 and is composed of a seat frame 20 formed by bending a metal pipe member similar to the support frame 19 into a U shape and welding a reinforcing member. . Then, one end of the support frame 19 is connected to one end of the seat frame 20 via an angle adjuster 14 which is an indirect metal fitting having an angle adjustment function, and the other end of the support frame 19 is a joint metal fitting which is an indirect metal fitting. The other end of the seat frame 20 is connected via 24. That is, the angle adjuster 14 is configured to change the inclination angle of the backrest 17.

  Here, the fitting 24 will be described with reference to the drawings. FIG. 2 is an exploded perspective view showing an example of a fitting. In FIG. 2, reference numeral 25 denotes a joint arm member formed by sheet metal. The joint arm member 25 has a pipe insertion cylindrical portion 25a and a pivot attachment boss surface 25b forming a pivot attachment through hole 25c. That is, the through-holes 25c, 25c of the two joint arm members 25, 25 are concentric, abutting the respective pivot attachment boss surfaces 25b, 25b, and pivotably pivoting by the pivot attachment rivet member 26 Is the fitting 24. As described above, the fitting 24 can swing the support frame 19 and the seat frame 20 by inserting the pipe insertion cylindrical portions 25a and 25a into the support frame 19 and the seat frame 20, respectively. It is linked to.

Next, the angle adjuster 14 will be described with reference to the drawings. 3 is a perspective view showing an example of the implementation of the angle adjuster, FIG. 4 is an exploded perspective view thereof, FIG. 5 is a right side view thereof, and FIG. 6 is a left side view thereof. . FIG. 7 is a sectional side view of the main part.
3 to 7, the support frame 19 and the seat frame 20 described above are omitted. Reference numeral 1 denotes an arm member formed by sheet metal, and the arm member 1 includes a gear portion 4 that forms a first pivot mounting hole 1c in the center and a first cylindrical portion 1a into which a support frame 19 can be fitted. Are integrally formed. The first cylindrical portion 1 a is formed by extending from the gear portion 4. Moreover, the locking hole 1b penetrated to the convex part 29 protruded from the 1st cylindrical part 1a is provided. The gear portion 4 has 19 gear teeth 4a in an arc range of approximately 145 ° (± 10 °). That is, 20 gear grooves are formed. As described with reference to FIG. 1, the first cylindrical portion 1 a is connected by externally fitting one end of the support frame 19.

  Reference numeral 2 denotes a holding member formed by sheet metal, and the holding member 2 forms a storage space portion 3 by side walls 27 and 28 arranged in a face-to-face manner and can be fitted with a seat frame 20. The second cylindrical portion 2a is integrally formed. The second cylindrical portion 2 a is formed by extending from the space portion 3. A part of one side wall 27 is bent and protruded in the outer direction opposite to the space 3 to form an upstanding piece 16 having a notch 16a. Further, a locking piece 15 is formed in which a part of the other side wall 28 is bent and protruded in the outward direction opposite to the space 3. Further, a second pivot hole 2c and a first support hole 2d penetrating the side walls 27 and 28 are formed. In the assembled state of the arm member 1 and the holding member 2, the gear portion 4 of the arm member 1 is accommodated in the space portion 3, and the first pivot hole 1 c of the arm member 1 and the second pivot hole of the holding member 2. 2c is pivotally attached. As described with reference to FIG. 1, the second cylindrical portion 2 a is connected by fitting one end of the seat frame 20.

  In addition, the front surface 7 has a plurality of tooth portions 6 a that can be locked to the gear portion 4, and a block-like claw member 6 having a back surface 9 on which a cam surface is formed. Further, the claw member 6 is housed in the space 3 of the holding member 2. Further, the first support hole 2d provided through the holding member 2 and the side surface of the claw member 6 are provided so that the plurality of teeth 6a of the claw member 6 can be engaged with the gear portion 4. The second support hole is pivotally attached to the rivet shaft 23.

  Further, a cylindrical rotating small roller 13 that contacts the back surface 9 of the claw member 6 and meshes the tooth portion 6a with the gear portion 4 and a shaft portion 21 that rotatably holds the rotating small roller 13 are integrally provided. The operation lever 12 has a third pivot hole 12c provided therethrough, and the second pivot hole 2c and the third pivot are formed on the outer surface of one side wall 27 of the holding member 2. The hole 12c is pivotally mounted concentrically. That is, the rotating small roller 13 inserted into the shaft portion 21 is configured to be able to operate to contact and separate from the back surface 9 by swinging the operation lever 12.

  Further, the locking pin 8 is inserted and fixed in the locking hole 30 of the arm member 1. Then, with the arm member 1 and the holding member 2 being pivotally attached, a spiral spring 10 that is always elastically energized so as to bring the first cylindrical portion 1a of the arm member 1 closer to the second cylindrical portion 2a of the holding member 2 is provided. Are attached. The spiral spring 10 has an inner end formed by bending an inner end of the spiral spring 10 on an engaging piece 15 of the holding member 2 while an outer end engaging portion 10b formed by bending an outer end is engaged with an engaging pin 8. The end locking portion 10a is locked. In addition, unlike the conventional spiral spring, the spiral spring 10 does not have a spring material formed in a spiral shape up to the central portion, but is hollowed out near the central portion to reduce the weight, and the inner end is bent to lock the inner end. The part 10a is formed.

  Further, the operation lever 12 is provided with a torsion spring 11 capable of engaging one end 11a, and the other end 11b of the torsion spring 11 is engaged with the notch 16a of the standing piece 16 of the arm member 1. Further, the torsion spring 11 presses the tooth portion 6a of the claw member 6 against the gear portion 4 by bringing the small rotating roller 13 rotatably held by the operation lever 12 into contact with the back surface 9 of the claw member 6. ing. In other words, the torsion spring 11 constantly urges and urges the operation lever 12 in the direction of the seat 18 (downward when viewed from the seated person). When the operation lever 12 is swung in the direction of the backrest portion 17 (upward when viewed from the seated person), the contact upper surface 12a of the operation lever 12 shown in FIG. The upper swing is restricted.

Further, the torsion spring 11 is inserted into the stepped portion 5b through the first pivoting shaft 5 having the flange portion 5a, and the pivoting shaft portion 5c protruding from the stepped portion 5b is connected to the first, second and third pivoting holes 1c. , 2c, 12c are inserted in a skewered manner and pivotally attached. That is, the arm member 1, and the holding member 2, and an operation lever 12 is pivotally attached swingably coaxially C ₁ around.

  In addition, the arrangement position of the pivot point S of the claw member 6 which is also a reference for the arrangement of the support holes 2d of the holding member 2 described above will be described with reference to the drawings. FIG. 9 is an enlarged explanatory view of a main part for explaining a state in which the arm member 1 receives a force in the backward tilt direction and the tooth part 6a and the gear part 4 are engaged with each other, and FIG. It is explanatory drawing which shows arrangement | positioning of a point. In FIG. 9, the tooth portion 6 a ′ at the center position (when there are an even number of tooth portions 6 a, the tooth close to the pivot point S from the center is the tooth portion 6 a ′ at the center position) and the gear of the gear portion 4. The contact point of the tooth 4a is P. Q indicated by a two-dot chain line is a pitch circle of the gear portion 4. L indicates a tangent line of the pitch circle Q passing through the contact point P. That is, as shown in FIG. 10, the pivot point S of the claw member 6 is disposed closer to the gear part 4 than the tangent line L in the horizontal direction in the W direction.

  The design of the present invention can be changed, and for example, a resilient member that assists the separation of the meshing between the tooth portion 6a of the claw member 6 and the gear portion 4 may be provided. In addition, it is desirable to attach a handle lever having a grip portion to the operation lever 12 so that the occupant can easily operate the lever. Further, the arm member 1 is formed with a stopper groove 31 in which the tip portion 30 of the claw member 6 can be locked, so that the gear portion 4 and the tooth portion 6a are separated so that the arm member 1 does not tilt too much forward. It is desirable that the distal end portion 30 of the member 6 is engaged with the stopper groove 31 to restrict the swinging of the arm member 1 in the forward tilt direction. Further, the gear teeth 4a and the tooth portions 6a are not limited to the numbers shown in the embodiment, and are free. Further, the spiral spring 10 may not be formed by hollowing out the vicinity of the center portion but may be manufactured so as not to form the vicinity of the center portion in the spring forming step.

The use method (action) of the furniture with a backrest of the present invention described above will be described with reference to the drawings.
FIG. 10 is a cross-sectional side view of an essential part for explaining a state in which the gear portion 4 and the tooth portion 6a are engaged with each other when α indicating the backward inclination angle of the backrest portion 17 with respect to the seat portion 18 is 90 °, and FIG. FIG. 12 is a sectional side view for explaining a state where the tooth portion 6a is separated from the gear 4, and FIG. It is a principal part cross-sectional side view explaining the meshed state.
In FIG. 10, the operation lever 12 is always elastically biased downward by the torsion spring 11. The small rotating roller 13 attached to the operation lever 12 contacts the back surface 9 of the claw member 6, and the tooth portion 6 a of the claw member 6 is pressed against the gear portion 4 of the arm member 1 to be engaged. At this time, the arm member 1 is elastically biased so as to always tilt forward by the spiral spring 10 described above. When the seat occupant (user) leans on the backrest portion 17 shown in FIG. 1, the load of the person is greater than the elastic biasing force of the spiral spring 10, so the arm member 1 tries to tilt backward. To do. However, since the plurality of tooth portions 6a of the claw member 6 mesh with the gear portion 4, the arm member 1 (backrest portion 17) is prevented from tilting backward. That is, the load is received by the plurality of tooth portions 6 a of the claw member 6.

  Next, when the angle of the backrest 17 is adjusted backward, the operation lever 12 is swung upward (the seat occupant pulls the operation lever 12). Then, as shown in FIG. 11, the small rotary roller 13 is separated while rotating along the back surface 9 of the claw member 6, and the claw member 6 tilts backward. Furthermore, since the arm member 1 is elastically biased forward by the spiral spring 10, it tends to tilt forward. Therefore, a load is applied to the backrest portion 17 shown in FIG. 1 to tilt the arm member 1 backward. Then, when the backrest portion 17 (arm member 1) is set to a desired position, the operation lever 12 is swung downward (returned to the original position). Then, the small rotating roller 13 comes into contact with the claw member 6 while rotating along the back surface 9, and the plurality of tooth portions 6 a of the claw member 6 are pressed against the gear portion 4 to be engaged with each other. That is, the angle of the backrest 17 is determined by preventing the arm member 1 from tilting in the front-rear direction. Thereafter, the load (weight) applied to the backrest 17 to the backward inclination is received by the plurality of teeth 6 a of the claw member 6. Further, when the operation lever 12 is pulled upward and swung, the contact upper surface 12a of the operation lever 12 abuts on the contact lower surface 16b of the upright piece 16 shown in FIG. ing.

  Next, when adjusting the angle of the backrest portion 17 in the forward tilt direction, the operation lever 12 is swung upward. As a result, the small rotating roller 13 rotates and separates along the back surface 9 of the claw member 6 and the claw member 6 tilts backward so that there is nothing to lock the arm member 1. Then, no load is applied to the backrest 17. Then, since the spiral spring 10 elastically biases the arm member 1 (backrest portion 17) in the forward tilt direction, the backrest portion 17 automatically swings in the forward tilt direction. Therefore, when the backrest portion 17 is set to a desired position, the operation lever 12 is swung downward. Then, the small rotating roller 13 comes in contact with the claw member 6 while rotating along the back surface 9, and the tooth portion 6 a of the claw member 6 is pressed against the gear portion 4 and meshed. That is, the angle of the backrest 17 is determined. Here, if the load is not applied to the backrest portion 17 by pulling it upward and swinging the operation lever 12, the backrest portion 17 tilts forward so as to be folded due to the elastic biasing force of the spiral spring 10, The stopper groove 31 is formed in the arm member 1 so that the distal end portion 30 of the claw member 6 can be locked even if the tooth portion 6a of the claw member 6 and the gear portion 4 are not meshed with each other. In this case, the arm member 1 is moved forward when the distal end portion 30 of the claw member 6 is locked in the stopper groove 31 and the gear portion 4 and the tooth portion 6a are separated (the operation lever 12 is pulled upward). It does not swing too much in the tilt direction.

  Further, regarding the meshing of the claw member 6 and the gear portion 4, the arm member 1 tilts to 180 ° in the initial state shown in FIG. 10 (backward tilt angle α is 90 °) and in FIG. In the example of FIG. 12, the gear portion 4 has 19 gear teeth (20 gear grooves) and the claw member 6 has 5 tooth portions 6a. Further, since the angle is 180 ° with one groove remaining, the arm member 1 can adjust the 90 ° section from 90 ° to 180 ° in 14 steps. In other words, the angle adjuster 14 as an example of the embodiment makes it possible to finely adjust the angle of the backrest 17 at an interval of approximately 6 ° 24 ′. That is, the number of angle switching steps can be set to 10 to 25 by increasing or decreasing the number of teeth 6a or gear teeth 4a or increasing or decreasing the number of meshing teeth.

  As described above, according to the present invention, in the furniture having the backrest 17 that can be tilted back and forth by the angle adjuster 14, the angle adjuster 14 is connected to the support frame 19 of the backrest 17 in the arm member 1. A claw member 6 that is integrally formed with the arm member 1 and a claw member 6 that is detachably engaged with the gear portion 4 to prevent the backrest 17 from tilting backward. Since the front end has a plurality of tooth portions 6a that are removably engaged with the gear portion 4, the force that prevents the claw member 6 from being tilted can be distributed and received by the plurality of tooth portions 6a. The force applied to the tooth portion 6a can be reduced. That is, the gear teeth 4a of the gear portion 4 can be reduced and the number of gears can be increased, so that the number of positioning steps of the backrest portion 17 can be increased. That is, the angle of the backrest portion 17 can be finely adjusted. Furthermore, the gear part 4 and the claw member 6 can be reduced in size and weight.

  Further, since the operation lever 12 having the small rotating roller 13 that contacts the back surface 9 opposite to the front surface 7 having the plurality of tooth portions 6a of the claw member 6 and presses the claw member 6 against the gear portion 4 is provided. The member 6 can be reliably pressed against the gear portion 4 to support the backrest portion 17. Further, since the small rotating roller 13 rotates and presses along the back surface 9 of the claw member 6, the operation lever 12 can be swung downward with a slight force and can be easily operated. Even when the operating lever 12 is swung upward, the small rotating roller 13 rotates and separates, so that the operating lever 12 can be easily operated.

  Further, the sheet metal holding member 2 having the storage space portion 3 that is provided continuously with the seat frame 20 and can store the claw member 6 and the gear portion 4 and the arm member 1 are always repelled in the direction of swinging forward. And the arm member 1 and the holding member 2 are pivotally attached to lock the outer end locking portion 10b of the spiral spring 10 to the arm member 1, and the holding member 2 The inner end locking portion 10a of the spiral spring 10 is configured to be able to be locked to the locking piece 15 that is partially bent and protruded, and the inner end locking portion is formed so that the spiral spring 10 is hollowed out in the vicinity of the center portion. Since 10a is formed, the spiral spring 10 can be reduced in weight. Further, since the inner end locking portion 10a of the spiral spring 10 can be locked to the locking piece 15 that is formed by bending a part of the holding member 2, the inner end locking of the spiral spring 10 is possible. No additional parts are required, reducing the number of parts and reducing costs. The holding member 2 includes a second cylindrical portion 2 a that can be connected to the seat frame 20, a space portion 3 in which the claw member 6 and the gear portion 4 are accommodated, and an inner end locking portion 10 a of the spiral spring 10. Can be integrally formed by sheet metal, so that the assembly process can be reduced and production can be performed at a low cost.

  Further, the operation lever 12 has a torsion spring 11 that can lock one end 11a, the arm member 1 and the operation lever 12 are pivoted, and a part of the holding member 2 is bent and protruded. The other end 11b of the torsion spring 11 is locked to the piece 16 to urge and push the small roller 13 of the operation lever 12 against the claw member 6 and to swing the operation lever 12 to the standing piece 16. Therefore, the number of parts can be reduced without requiring a separate regulating member. The holding member 2 includes a second cylindrical portion 2 a that can be connected to the seat frame 20, a space portion 3 in which the claw member 6 and the gear portion 4 are accommodated, and an inner end locking portion 10 a of the spiral spring 10. The upright piece 16 that restricts the swinging of the operation lever 12 can be integrally formed by sheet metal, so that the assembly process can be reduced and the production can be performed at low cost. In addition, since the swinging of the operation lever 12 is restricted by the standing piece 16, an erroneous operation of the operation lever 12 can be prevented. In addition, since the torsion spring 11 is used, it is possible to prevent malfunctions and malfunctions due to dust biting, catching on the spring seats, and the like, which were the causes of malfunction when using a tension spring or the like. Further, since the torsion spring 11 has the one end 11a that can be directly locked to the operation lever 12, a separate locking member is not required, the number of parts can be reduced, and light weight can be produced at low cost.

  Further, the tooth portion 6a 'at the center position among the plurality of tooth portions 6a and the tangent line L of the pitch circle Q of the gear portion 4 passing through the contact point P with the gear portion 4 are closer to the gear portion 4 to Since the pivot point S of the member 6 is disposed, the tooth portion 6a is formed in the gear portion 4 so that the claw member 6 is separated from the gear portion 4 by itself when the small rotating roller 13 is separated from the back surface 9 of the claw member 6. Can be removed smoothly. Further, when the small rotating roller 13 is in contact, the plurality of tooth portions 6a can be securely and smoothly engaged with the gear portion 4, and the teeth portion 6a reliably receives the load applied to the backrest portion 17 (arm member 1). be able to.

It is a perspective view which shows one Embodiment of this invention. It is a disassembled perspective view which shows an example of implementation of a fitting. It is a perspective view which shows an example of implementation of an angle adjustment tool. It is a disassembled perspective view which shows an example of implementation of an angle adjustment tool. It is a right view which shows an example of implementation of an angle adjustment tool. It is a left view which shows an example of implementation of an angle adjustment tool. It is a partial cross section side view explaining an angle adjustment tool. It is a principal part expanded explanatory view explaining the relationship between a tooth | gear part and a gear part. It is explanatory drawing explaining the pivot point of a nail | claw member. It is an operation explanatory view. It is an operation explanatory view. It is an operation explanatory view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Arm member 2 Holding member 3 Space part 4 Gear part 6 Claw member 6a Tooth part 6a 'The tooth part of the center position 7 Front 9 Back
10 Spiral spring
10a Inner end locking part
10b Outer end locking part
11 Torsion spring
11a One end
11b The other end
12 Control lever
13 Rotating small roller
14 Angle adjuster
15 Locking piece
16 Standing piece
17 Backrest
19 Support frame
20 Seat frame L Tangent P Contact point Q Pitch circle S Pivot point

Claims (5)

  In the furniture having the backrest (17) that can be tilted back and forth by the angle adjuster (14), the angle adjuster (14) is connected to the support frame (19) of the backrest (17). An arm member (1), a gear part (4) formed integrally with the arm member (1), and a rear part of the backrest part (17) by being detachably locked to the gear part (4). A claw member (6) for preventing tilting, wherein the claw member (6) has a plurality of teeth (6a) at its tip, which are detachably engaged with the gear (4). Furniture with backrest.   A small rotating roller that abuts against the back surface (9) opposite to the front surface (7) having the plurality of tooth portions (6a) of the claw member (6) and presses the claw member (6) against the gear portion (4). The furniture with a backrest according to claim 1, further comprising an operation lever (12) having (13).   A sheet metal holding member (2) connected to the seat frame (20) and having a storage space (3) capable of storing the claw member (6) and the gear portion (4), and the arm member (1). ) And a spiral spring (10) that elastically urges forward in the direction of swinging forward, and the arm member (1) and the holding member (2) are pivotally attached to the spiral spring ( 10) The outer end locking portion (10b) of 10) is locked to the arm member (1), and the spiral spring is fixed to the locking piece (15) formed by bending a part of the holding member (2). The inner end locking portion (10a) of (10) is configured to be lockable, and the spiral spring (10) forms an inner end locking portion (10a) by hollowing out the vicinity of the center portion. And furniture with a backrest as described in 2.   The operation lever (12) has a torsion spring (11) capable of locking one end (11a), and the arm member (1) and the operation lever (12) are pivotally attached to the holding member ( 2) The other end (11b) of the torsion spring (11) is locked to the upright piece (16) that is bent and protruded partially, and the small rotating roller (13) of the operating lever (12) 4. The structure according to claim 1, 2, or 3, wherein the operation lever (12) is restricted by the standing piece (16) while being urged and urged so as to be pressed against the claw member (6). Furniture with backrest.   The pitch circle (Q) of the gear part (4) passing through the contact point (P) between the tooth part (6a ') at the center position among the plurality of tooth parts (6a) and the gear part (4). The furniture with a backrest according to claims 1 to 4, wherein a pivot point (S) of the claw member (6) is disposed closer to the gear portion (4) than to the tangent (L).

Images