JP2012165957A - Angle adjustment metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an angle adjustment metal fitting to solve a conventional problem.SOLUTION: The angle adjustment metal fitting includes: a first member 1; a second member 2 swingably and pivotally connected with the first member 1 around a first axis Cand including a gear part 4; and a floating wedge member 6 forming a tooth flank 7 held in the first member 1 side and engageable with the gear part 4 in one surface side, and forming an abutting surface 9 abutting on a wedge face 8 formed in the first member 1 side in the other surface side thereof, and wherein the tooth flank 7 is engaged with the gear part 4, the abutting surface 9 abuts on the wedge face 8, for suppressing the second member 2 from swinging in one direction to the first member 1. The angle adjustment metal fitting includes a sub unit 26 integrally forming an elastic plate spring member 13 elastically energizing in the direction to push the floating wedge member 6 to the gear part 4 of the second member 2 and a top plate member 29 for preventing the intrusion of foreign matter arranged so as to cover the gear part 4 of the second member 2 from above.

Description

  The present invention relates to an angle adjusting bracket.

Conventionally, the present applicant has proposed an angle adjusting bracket as a joint member that adjusts an angle formed by a member on one side and a member on the other side (see Patent Document 1).
For example, a chair having a back portion 15 and a seat portion 16 as shown in the perspective view of FIG. 1 has an angle adjustment function between the back portion 15 and the seat portion 16 so that the inclination angle of the back portion 15 can be adjusted. It has metal fittings.

  The conventional angle adjusting bracket shown in FIG. 8 is held on the first arm 101 side, the second arm 102 pivotally connected to the first arm 101 and provided with a gear portion 104, and the first arm 101 side. The one surface side is a tooth surface 107 that can mesh with the gear portion 104, and the other surface side is a contact surface 109 that contacts the wedge surface 108 formed on the first arm 101 side, and the tooth surface 107 meshes with the gear portion 104. And a floating wedge member 106 that prevents the second arm 102 from swinging in one direction with respect to the first arm 101 when the abutment surface 109 abuts on the wedge surface 108, and further includes a floating wedge member A resilient member 113 that resiliently biases 106 in a direction to press the gear 106 to the gear portion 104 of the second arm 102, and a foreign matter intrusion prevention member 126 disposed so as to cover the gear portion 104 of the second arm 102 from above. A, a.

Japanese Patent No. 4418382

  However, as shown in FIG. 9, the elastic member 113 according to the conventional angle adjusting bracket is a spring member in which a steel wire is formed in an elongated rectangular shape, and has a cut 114 at one end thereof. The elastic member 113 has a difference (elasticity) between one end having the cut 114 and the other end connected in a continuous manner, and the mounting direction is limited. Therefore, there is a fear that the mounting direction of the elastic member 113 may be wrong when the angle adjusting bracket is assembled. Further, when a plurality of elastic members 113 are stored in a parts warehouse or a parts box, there is a drawback that they are entangled with each other (see FIG. 9).

  Also, as shown in FIGS. 8 and 10, the conventional foreign matter intrusion prevention member 126 includes a belt-like top plate portion 129 and a lower portion of the top plate portion 129, and the top member 129 is attached to the shaft member 120. And a support piece 128 for supporting. The foreign matter intrusion prevention member 126 has a larger volume of the support piece portion 128 (in an auxiliary role) than the top plate portion 129 provided for the purpose of preventing the foreign matter from entering the gear portion 104. There was a problem that material costs were wasted.

  Then, an object of this invention is to provide the angle adjustment metal fitting which solves said problem.

  An angle adjusting bracket according to the present invention is held on the first member side, a second member pivotally pivotable about the first member and the first axis and having a gear portion, and held on the first member side. And one surface side is a tooth surface that can mesh with the gear portion, and the other surface side is a contact surface that abuts against a wedge surface formed on the first member side, and the tooth surface meshes with the gear portion and corresponds. A floating wedge member comprising: a floating wedge member having a contact surface abutting against the wedge surface and suppressing the second member from swinging in one direction with respect to the first member. An elastic spring plate spring member that elastically urges the second member in a direction to press against the gear portion, and a foreign material intrusion prevention top plate member that covers the gear portion from above are integrally formed. It comprises a subunit body.

The integrated subunit body is assembled by mechanically connecting the elastic spring plate member and the top plate member in advance.
Further, the integrated subunit body may be formed by insert molding in which the elastic spring member is installed in a molding die.
Further, the elastic leaf spring member is a Z-shaped point-symmetrical shape around the center of gravity when viewed from the side, and has an intermediate connecting portion and a latch connected in a bent shape from both ends of the intermediate connecting portion. And one part.

  According to the angle adjusting bracket of the present invention, it is possible to prevent the mounting direction of the elastic leaf spring member from being wrong, and it is possible to assemble one after another quickly. Further, it can be manufactured at low cost by eliminating waste of material costs. It is possible to efficiently prevent foreign matters such as dust from entering between the gear portion and the floating wedge member, thereby preventing the occurrence of a failure.

It is a perspective view of the chair which has an angle adjustment metal fitting. It is the perspective view which showed one Embodiment of the angle adjustment metal fitting of this invention. It is a fracture perspective view of an angle adjustment metal fitting. It is a cross-sectional side view of an angle adjustment metal fitting. It is the perspective view which showed the subunit body before an assembly. It is the perspective view which showed the subunit body. It is a principal part expanded side view for an effect | action description. It is the cross-sectional side view which showed the conventional angle adjustment metal fitting. It is the explanatory simplified figure which showed the elastic member which concerns on the conventional angle adjustment metal fitting. It is the explanatory side view which showed the foreign material penetration | invasion prevention member which concerns on the conventional angle adjustment metal fitting.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
As shown in FIG. 1, the angle adjusting bracket A of the present invention is used, for example, in a joint portion of a chair having a back portion 15 and a seat portion 16, and the inclination angle between the seat portion 16 and the back portion 15 is changed. An angle adjusting function is provided between the first member 1 (fixed to the seat portion 16 side) and the second member 2 (fixed to the back portion 15 side) so that adjustment is possible. In addition, the angle adjusting bracket A of the present invention can be used for a sofa, a headrest, a footrest, etc. in addition to a chair, and can be incorporated into a swinging of two constituent members. It can also be used for shelves that swing and open doors.

As shown in FIGS. 2 to 4, the angle adjusting bracket A according to the present invention is pivotally connected to the first member 1, the first member 1, and the first axis C ₁ so as to be swingable and the gear portion 4. The second member 2 is provided with a tooth surface 7 that is held on the first member 1 side and can be meshed with the gear portion 4, and the other surface abuts against the wedge surface 8 formed on the first member 1 side. The contact surface 9 is engaged with the gear portion 4 and the contact surface 9 is in contact with the wedge surface 8 to prevent the second member 2 from swinging in one direction with respect to the first member 1. And a floating wedge member 6.

Furthermore, the angle adjusting bracket A covers the spring plate member 13 that elastically biases the floating wedge member 6 in the direction of pressing the floating wedge member 6 against the gear portion 4 of the second member 2 and the gear portion 4 of the second member 2 from above. Thus, the subunit member 26 in which the foreign body intrusion prevention top plate member 29 is integrated is provided.
The elastic leaf spring member 13 is a Z-shaped spring member as viewed from the side formed by bending a thin steel plate material, and is connected to both ends of the belt-like intermediate connecting portion 13A and the intermediate connecting portion 13A ( A pair of locking pieces 13B and 13C formed in a substantially right-angled shape. In the side view shown in FIG. 4, the leaf spring member 13 has a center of gravity G at the middle position in the vertical direction of the intermediate connecting portion 13 </ b> A and in the thickness direction. The portions 13B and 13C are formed as point-symmetric shapes around the center of gravity G. That is, the leaf spring member 13 is formed to have the same shape even when the locking pieces 13B and 13C are repeated upside down.
The foreign material intrusion prevention top plate member 29 is a molded product made of synthetic resin, and its lateral width W is set to be slightly larger than the interval between the wall portions 17 and 17 of the first member 1 described later. The top plate member 29 is formed such that one end portion 29A in the longitudinal direction is inclined downward and the other end portion 29B is inclined upward (raised). An insertion hole 30 communicating in the longitudinal direction is formed at an intermediate position of the top plate member 29.

As shown in FIGS. 5 and 6, the integrated subunit body 26 is assembled by mechanically connecting the elastic spring member 13 and the top plate member 29 in advance.
The elastic leaf spring member 13 is fitted by sliding one of the two locking pieces 13C into the insertion hole 30 of the top plate member 29 from the one end 29A side. The sub-unit body 26 is assembled as a single component by connecting the elastic spring member 13 and the top plate member 29 in a pre-process for assembling the angle adjusting bracket A of the present invention. The elastic spring member 13 may be attached to the top plate member 29 (a pair of upper and lower) locking pieces 13B and 13C, and the mounting operation is easy and quick without worrying about the vertical direction. Can work.

Here, the structure of the angle adjusting bracket A will be further described.
2 to 4, the first member 1 includes a case portion 3 having a pair of facing wall portions 17, 17 and a cylindrical first attachment portion 18 extending from the case portion 3. The first mounting portion 18 is inserted into the seat portion 16 so as to be fixed. Walls 17 and 17, the central portion of each, is provided with a through-hole 21, and forms a shaft hole around the first axis _{C 1.}
The second member 2 includes two gear plate portions 45, 45 parallel to each other, a gear portion 4 that is housed in the case portion 3, and a cylindrical second mounting portion that extends from the gear portion 4. 19, and the second mounting portion 19 is inserted into the back portion 15 side so as to be fixed. The gear plate portions 45, 45 are provided with through holes 22, 22 at the center portions thereof, and form shaft holes centered on the first axis C ₁ .
Gear portion 4 is formed along an arc line around the first axis _{C 1,} quadrant (90 °) slightly (10 ° to 30 ° approximately) given to the range (100 ° to 120 °) exceeding Has gears (teeth) of equal pitch.
The first member 1 and the second member 2 are pivoted by a shaft member 20. That is, with the gear portion 4 of the second member 2 sandwiched between the wall portions 17 and 17 of the first member 1, the shaft member 20 is connected to the through holes 21 and 21 of the first member 1 and the second member 2. The second member 2 can be swung around the first axis C _{1 with} respect to the first member 1 by being inserted into the through holes 22, 22 and crimped.

The first member 1 (in the case portion 3) includes a wedge-shaped window portion 5. The wedge-shaped window portion 5 is formed in the same shape on the wall portions 17 and 17 of the case portion 3, respectively, and the case portion 3 has a penetrating shape.
As shown in FIGS. 4 and 7, the wedge-shaped window portion 5 is formed in an arc shape so as to be concave toward the first axis C ₁ side in a side view, and has a larger diameter than the gear portion 4. outward from the side formed arcuate wedge surface 8, it is formed with a circular arc surface 23 around the first axis C ₁ inward side (the smaller diameter than the gear portion 4). Accordingly, the gear teeth of the gear portion 4 are visible from the wedge-shaped window portion 5.
The wedge surface 8 is formed in a circular arc shape and becomes a wedge-shaped hole that shrinks in the clockwise direction. In other words, the wedge surface 8 is formed so as to gradually approach the gear portion 4. That is, a space is formed between the outer wedge surface 8 and the outer peripheral tooth surface of the gear portion 4, and the floating wedge member 6 is movably disposed in the space.

  As shown in FIG. 7, the floating wedge member 6 has a tooth surface 7 having a plurality of gear teeth formed on a concave curved surface that is the same as the radius of curvature of the pitch circle of the gear portion 4 on one surface side. It is comprised so that the surface 7 and the gear part 4 may mesh | engage. Further, the other surface side of the floating wedge member 6 has a contact surface 9 formed so as to be (substantially) the same as the radius of curvature of the wedge surface 8. The width dimension of the floating wedge member 6 is set to be substantially the same as the width dimension of the case portion 3 of the first member 1. That is, both side edges of the abutting surface 9 of the floating wedge member 6 can abut on the wedge surface 8 of the wedge-shaped window portion 5 (wall portions 17, 17). Although not shown in the figure, the floating wedge member 6 may be produced by cutting a long drawn steel material into a predetermined length.

The floating wedge member 6 forms a guide gradient surface (stepped surface) 27 at the rear edge of the tooth surface 7, and the wedge-shaped window portion 5 forms a guide gradient surface 27 on the arcuate surface 23 on the inner side. The contact stepped portion 28 is formed so as to be able to come into contact. The wedge-shaped window portion 5 includes a retracting space portion 11 that accommodates the floating wedge member 6 and releases the meshed state between the tooth surface 7 and the gear portion 4.
Further, the second member 2 has a push-back protrusion 10 for pressing the floating wedge member 6 on one end side (upper end side) of the gear portion 4, and the retraction space portion 11 of the wedge-shaped window portion 5. An extrusion protrusion 12 that pushes out the accommodated floating wedge member 6 is provided on the other end side (lower end side) of the gear portion 4.

  When the first member 1 and the second member 2 are pivoted by the shaft member 20, the floating wedge member 6 is inserted into the wedge-shaped window portion 5, and the tooth surface 7 and the gear portion 4 are engaged with each other. The locking piece portion 13B of the elastic spring member 13 is locked to the locking portion 31 provided at the lower part of the case portion 3 of the first member 1, and the intermediate connecting portion 13A is brought into contact with the contact surface 9. Thus, the floating wedge member 6 is always configured to be bullet-biased in the direction in which it is pressed against the gear portion 4. The sub-unit body 26 is fitted and held between the floating wedge member 6 and the case portion 3 of the first member 1, and the top plate member 29 always surrounds the gear portion 4 and the floating wedge member 6 from above. Thus, foreign matter such as dust is prevented from entering between the gear portion 4 and the floating wedge member 6. With this configuration, the failure frequency of the angle adjusting bracket A is reduced.

Next, as shown in FIG. 2, the angle adjusting bracket A includes a drop-off prevention cover 33 that prevents the floating wedge member 6 from dropping from the wedge-shaped window portion 5.
The fall-off prevention cover 33 is disposed so as to surround the case portion 3 of the first member 1 from the left and right outer sides with the floating wedge member 6 inserted through the wedge-shaped window portion 5. It is an approximately U-shaped thin plate. Specifically, the drop-off prevention cover 33 has a side wall 34 and a bottom wall 35. The side wall 34 is formed with a small step portion 36 at a position corresponding to the wedge-shaped window portion 5 of the case portion 3, and a separation surface portion 34 a that forms a slight gap with the outer surface of the wall portion 17. The separation surface portion 34 a is configured so that the frictional force between the end surface of the floating wedge member 6 and the side wall 34 is low and does not prevent the floating wedge member 6 from moving smoothly in the wedge-shaped window portion 5. The side wall 34 is provided with a hole 37 through which the shaft member 20 is inserted at a position corresponding to the through hole 21.

The angle adjusting bracket A of the present invention can be changed in design. For example, the integrated subunit body 26 is formed by insert molding in which the elastic leaf spring member 13 is installed in a molding die ( It may be formed integrally with the top plate member 29.
Although illustration is omitted, in the present invention, insert molding refers to a state in which a resin material is poured in a state where the plate spring member 13 is inserted into a mold for the top plate member 29, and the plate spring is inserted into the top plate member 29. This is a molding method in which parts of the member 13 are integrated so as to be buried, and a highly accurate molded product can be formed.

The use method (action) of the angle adjusting bracket of the present invention described above will be described.
In FIG. 1, the back portion 15 and the seat portion 16 are inclined so as to be separated from each other and developed into a plane shape, in other words, the first member 1 and the second member 2 are linear (180 ° phase). ) and a state (hereinafter, the referred to as the maximum expanded state) gradually second member 2 is swung to the first axis C ₁ around the attitude folding at any tilt angle between the first member 1 It can be held and swung until the back portion 15 is in an upright state (hereinafter referred to as a maximum folded state) that is substantially perpendicular to the seat portion 16.

FIG. 7 is an enlarged view of an essential part showing the operation of the floating wedge member 6 in the gear portion 4 and the wedge-shaped window portion 5.
FIG. 7A corresponds to the maximum deployed state, and the floating wedge member 6 engages with the gear portion 4 and abuts against the wedge surface 8 so that the second member 2 does not swing (clockwise in FIG. 4). It is locked to.
When the second member 2 is swung so that the back portion 15 stands up from here, as shown in FIG. 7 (b), the gear portion 4 is moved by the elastic leaf spring member 13 (see FIG. 4) of the subunit body 26. The floating wedge member 6 that meshes while being resiliently biased is separated from the wedge surface 8 of the wedge-shaped window portion 5 by its abutment surface 9 so that a slight amount is provided between the floating wedge member 6 and the wedge-shaped window portion 5. A gap d is generated. Then, the second member 2 is further swung, and the guide gradient surface 27 of the floating wedge member 6 is in contact with the contact stepped portion 28 of the wedge-shaped window portion 5 as shown in FIG. Thus, the floating wedge member 6 escapes due to the gap d and the tooth surface 7 is separated from the gear portion 4, and the tooth surface 7 of the floating wedge member 6 gets over the gear portion 4 with a clicking sound.
Thus, the floating wedge member 6 has the tooth surface 7 meshed with the gear portion 4 (with the elastic biasing force of the elastic leaf spring member 13), and the contact surface 9 abutted with the wedge surface 8, By the wedge action of the floating wedge member 6 sandwiched between the portion 4 and the wedge surface 8, the second member 2 is prevented from expanding with respect to the first member 1, and the back portion 15 and the seat portion 16 are arbitrarily folded. Hold at an angle (tilt angle).

  Then, as shown in FIG. 7 (d), when the second member 2 swings to the maximum folded state with respect to the first member 1, the push-back protrusion 10 presses the floating wedge member 6. Thereafter, as shown in FIG. 7 (e), the floating wedge member 6 is pushed by the push-back protrusion 10, and the guide gradient surface 27 resists the elastic urging force of the elastic leaf spring member 13 and the wedge-shaped window portion. The fifth stepping portion 28 is overcome and accommodated in the retreat space portion 11. In other words, the floating wedge member 6 is accommodated in the retreat space 11 so as to be separated from the gear portion 4 and the meshing state between the tooth surface 7 and the gear portion 4 is released. Therefore, the second member 2 is released from the rocking restriction with respect to the first member 1 and can be freely expanded and folded.

  Then, when the second member 2 is swung to the maximum unfolded state which is linear with respect to the first member 1, the gear portion 4 is retracted by the pushing projection 12 as shown in FIG. The floating wedge member 6 (the guiding gradient surface 27) accommodated in the portion 11 is pressed, and the tooth surface 7 and the gear portion 4 are returned to the meshing state by the elastic urging force of the elastic plate spring member 13.

  In other words, in the wedge-shaped window portion 5, the floating wedge member 6 moves to the gear portion 4 and the wedge surface 8 in the process of gradually swinging the second member 2 from the maximum unfolded state to the maximum folded state. The first member 1 having the wedge-shaped window portion 5 and the second member 2 having the gear portion 4 can be adjusted at any folding angle (tilt angle) by the wedge action. When the second member 2 is swung beyond the maximum folded state, the floating wedge member 6 is accommodated in the retreat space portion 11 against the elastic urging force of the elastic plate spring member 13. Thus, the first member 1 and the second member 2 can swing with respect to each other. Then, when the second member 2 is returned to the maximum deployed state, the floating wedge member 6 is pushed out of the retracting space portion 11 to restore the tooth surface 7 and the gear portion 4 to the meshed state.

The sub-unit body 26 covers the gear portion 4 and the floating wedge member 6 of the second member 2 from above by the top plate member 29, and a part of the chair cloth body is interposed between the gear portion 4 and the floating wedge member 6. Prevent foreign material such as dust and dirt from entering.
The sub-unit body 26 is mechanically or insert-molded so that the elastic spring plate member 13 and the top plate member 29 are integrally connected in advance so that they can be easily picked up and attached one after another during assembly work. It is possible to significantly reduce the tangling of the elastic leaf spring members 13. Moreover, the top plate member 29 for preventing foreign matter intrusion can be formed with a relatively small amount of resin material, thus saving material costs.

As described above, the angle adjusting bracket according to the present invention is a first member 1, a second member that is pivotably pivoted about the first member 1 and the first axis C ₁ and includes the gear portion 4. 2, a tooth surface 7 that is held on the first member 1 side and can be meshed with the gear portion 4 on one surface side, and a contact surface 9 that abuts on a wedge surface 8 formed on the first member 1 side on the other surface side. A floating wedge member 6 that prevents the tooth surface 7 from meshing with the gear portion 4 and the contact surface 9 against the wedge surface 8 to restrain the second member 2 from swinging in one direction with respect to the first member 1. Are provided so that the floating wedge member 6 is elastically biased in the direction of pressing the floating wedge member 6 against the gear portion 4 of the second member 2 and the gear portion 4 is covered from above. Since the subunit body 26 is integrated with the foreign substance intrusion prevention top plate member 29 provided, the elastic spring member 13 It can be installed without making a mistake in direction, and can be assembled quickly one after another. Moreover, the top member 29 for preventing foreign matter intrusion can be manufactured at low cost. It is possible to prevent the occurrence of a failure by preventing a foreign matter such as a part of a chair cloth or dust from entering between the gear portion 4 and the floating wedge member 6 so as not to operate.

  In addition, since the integrated subunit body 26 is assembled by mechanically connecting the elastic spring plate member 13 and the top plate member 29 in advance, it is easy to mount and mass production is possible.

  Further, since the integral subunit body 26 is formed by insert molding in which the elastic spring member 13 is installed in a molding die, the subunit body 26 can be manufactured with high accuracy and attached. And mass production is possible.

  The elastic leaf spring member 13 is Z-shaped with a point symmetry around the center of gravity G in a side view, and is connected in a bent shape from the intermediate connecting portion 13A and both ends of the intermediate connecting portion 13A. Since the locking piece portions 13B and 13C are formed, the same shape is obtained even when the locking piece portions 13B and 13C are repeated upside down (up and down), and are attached to the top plate member 29 or into the mold. Can be carried out easily and quickly.

DESCRIPTION OF SYMBOLS 1 1st member 2 2nd member 4 Gear part 6 Floating wedge member 7 Tooth surface 8 Wedge surface 9 Contact surface 13 Resilient spring member 13A Intermediate | middle connection part 13B, 13C Locking piece part 26 Subunit body 29 Top plate member C ₁ 1st axis G Center of gravity

Claims (4)

A first member (1), a second member (2) pivotably pivoted about the first member (1) and the first axis (C ₁ ) and provided with a gear portion (4); A wedge surface (8) formed on the side of the first member (1) and having the other surface side on the side of the first member (1), the one surface side being held on the first member (1) side and meshing with the gear portion (4). ), The tooth surface (7) meshes with the gear portion (4) and the corresponding contact surface (9) contacts the wedge surface (8). (2) An angle adjusting bracket comprising: a floating wedge member (6) that suppresses swinging of the first member (1) in one direction with respect to the first member (1).
A resilient leaf spring member (13) that resiliently biases the floating wedge member (6) against the gear portion (4) of the second member (2), and the gear portion (4) from above. An angle adjusting bracket comprising: a subunit body (26) in which a foreign body intrusion prevention top plate member (29) disposed so as to cover is integrated.   The angle adjusting bracket according to claim 1, wherein the integral subunit body (26) is assembled by mechanically connecting the elastic leaf spring member (13) and the top plate member (29) in advance. .   The angle adjusting bracket according to claim 1, wherein the unitary subunit body (26) is formed by insert molding in which the elastic leaf spring member (13) is placed in a molding die.   The elastic leaf spring member (13) is Z-shaped in a point-symmetric shape around the center of gravity (G) in a side view, and includes an intermediate connecting portion (13A) and both ends of the intermediate connecting portion (13A). The angle adjusting bracket according to claim 1, 2 or 3, further comprising: a locking piece portion (13B) (13C) provided continuously in a bent shape.

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