JP5280554B1 - Angle adjustment bracket - Google Patents

Abstract

An angle adjusting fitting that can be easily and inexpensively manufactured by sheet metal plastic working and has few failures is provided.
SOLUTION: The angle-adjustable hinge in which the first member 1 and second member 2 which is fabricated from sheet metal material is cross swingably pivotally connected to the pivot axis C ₁ around the first member 1 and the The first member 1 is held between the two members 2 and restricts the second member 2 from swinging in one direction with respect to the first member 1. And the thick part 29 which increased the plate | board thickness dimension T in the press-contact part 10 and 20 of the 2nd member 2 is formed by sheet metal plastic working.
[Selection] Figure 3

Description

  The present invention relates to an angle adjusting bracket.

Conventionally, the present applicant has proposed an angle adjusting bracket as a joint member for adjusting the angle formed by two arm members (hereinafter referred to as a first member and a second member) (see Patent Document 1).
The angle adjusting bracket described in Patent Document 1 is configured such that a floating wedge member is interposed between the first member and the second member, and the second member is restricted from swinging in one direction with respect to the first member. Has been.

Japanese Patent No. 4418382

However, the conventional angle adjusting bracket is a force required to suppress the swing of the first member and the second member when attached to a seat chair or the like having a back portion and a seat portion to support the human weight. Is expected to be very large. In particular, the first member and the second member pressed against the floating wedge member are subjected to a very large force, so that cracks may occur in the peripheral portion of the wedge-shaped window formed on the first member side, The gear part of the member was fatigued.
Therefore, the first member and the second member are manufactured using a measure to increase the overall thickness of the first member and the second member to increase the thickness, or a material having higher rigidity than that of the conventional product. However, in addition to the difficulty in manufacturing by sheet metal plastic working, there is a drawback that the cost of raw materials increases.

  Therefore, an object of the present invention is to provide an angle adjustment fitting that can be easily and inexpensively manufactured by sheet metal plastic working and has few failures.

An angle adjusting bracket according to the present invention is an angle adjusting bracket in which a first member and a second member manufactured from a sheet metal material are pivotally connected to each other around a swing axis, and the second member includes: The first member has a wedge surface that forms a wedge-shaped space between the first gear and the gear portion; and A sandwiched pressure member is held in the wedge-shaped space between the wedge surface of the first member and the gear portion of the second member, and the sandwiched member meshes with the gear portion on one side. A tooth surface having a plurality of possible teeth is formed, a contact surface that contacts the wedge surface is formed on the other surface side, the tooth surface meshes with the gear portion, and the corresponding contact surface contacts the wedge surface. the second member is configured to restrict the swinging in one direction relative to the first member in contact with, the first member is a sheet metal plastic The upright piece formed by bending the inner peripheral edge of the through-hole of a sheet metal material of a predetermined shape punched in the process into an L-shape by pressing is crushed by pressing from the tip edge side, and is locally A thickened portion having an increased thickness is formed, and the thickened portion is provided on the wedge surface that is a pressure contact portion of the first member with respect to the sandwiched member to reinforce the wedge surface, The second member crushes an upright piece formed by bending an outer peripheral edge of a sheet metal material of a predetermined shape punched by sheet metal plastic working into an L shape by press working from the tip edge side thereof. Thus, a thickened portion having a locally increased thickness is formed, and the thickened portion is provided in the gear portion that is a pressure contact portion of the second member with respect to the clamped member, and the gear portion is Reinforced, the thickness portion is 1.5 times the plate thickness before processing of the sheet metal material Is formed over .5 times the width of, and to locally increase the thickness 1.5 to 2.5 times of the augment thickness dimension of the unprocessed thickness dimension, the press contact portion and the object to be In addition to reducing the contact surface pressure with the pinching member, the pressure contact portion is configured to locally improve the strength and rigidity of the pressure contact portion against the reaction force received from the pinched member .

According to the angle adjusting bracket of the present invention, the strength and rigidity of the press contact portions of the first member and the second member can be improved, cracks and fatigue failure can be prevented, and the contact surface pressure of the press contact portions can be reduced. The thickness of the first member and the second member can be locally reduced while reducing the overall thickness of the first member and the second member, so that the cost of raw materials can be kept low, and the sheet metal plastic working can be performed. The manufacture of the first member and the second member is facilitated.

1 is an overall view showing an embodiment of the present invention. It is a section perspective view of the angle adjustment metal fitting of the present invention. It is a section perspective view of the angle adjustment metal fitting of the present invention. It is a section perspective view showing the 1st member. It is a section perspective view showing the 2nd member. It is the perspective view which showed the manufacturing method of an angle adjustment metal fitting. It is the perspective view which showed the manufacturing method of an angle adjustment metal fitting. It is the perspective view which showed the manufacturing method of an angle adjustment metal fitting. It is the perspective view which showed the manufacturing method of an angle adjustment metal fitting. It is the perspective view which showed the manufacturing method of an angle adjustment metal fitting. It is a principal part expanded sectional view which showed the manufacturing method of an angle adjustment metal fitting. It is a principal part expanded sectional view which showed the manufacturing method of an angle adjustment metal fitting. It is a principal part expanded sectional view which showed the manufacturing method of an angle adjustment metal fitting.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
As shown in FIGS. 1 to 3, the angle adjusting bracket of the present invention is such that a first member 1 and a second member 2 made of a sheet metal material are pivotally pivoted around a swing axis C _1. And a clamped member 6 that is held between the first member 1 and the second member 2 and restricts the second member 2 from swinging in one direction with respect to the first member 1. A thick portion 29 having an increased thickness T is formed by sheet metal plastic working at the press contact portions 10 and 20 of the first member 1 and the second member 2 with respect to the sandwiched member 6. .

  In addition, the first member 1 and the second member 2 are pivotally connected by the pivot shaft 13, and the thick portion 29 having an increased plate thickness T is formed on the sliding contact portions 11 and 21 with the pivot shaft 13. It is formed by sheet metal plastic working.

  The pinched member 6 has a contact surface 9 on one side which is a tooth surface 7 which can be engaged with the gear portion 4 formed on the second member 2 and whose other surface is in contact with a wedge surface 8 formed on the first member 1. The tooth surface 7 meshes with the gear portion 4 and the contact surface 9 contacts the wedge surface 8 so that the second member 2 is restricted from swinging in one direction with respect to the first member 1. Has been.

As shown in FIGS. 3 and 4, the first member 1 has a thick portion 29 formed over the entire periphery 5 </ b> A of the wedge-shaped window portion 5 having the wedge surface 8.
Further, the first member 1 has a pair of facing wall portions 17, 17, and circular through holes 12, 12 centering on the swing axis C ₁ are formed in the wall portions 17, 17. A thick portion 29 is formed over the entire circumference of 12,12.
The first member 1 includes a case portion 30 including a pair of wall portions 17 and a cylindrical attachment piece portion 18 extending from the case portion 30. The through holes 12 and 12 are disposed at the center of each of the wall portions 17 and 17 to penetrate the case portion 30, and the radius thereof is set to the same radius as that of the pivot shaft 13.

The wedge-shaped window portion 5 is formed so as to penetrate the pair of wall portions 17 and 17 in the same shape, and the case portion 30 is formed as a penetrating shape. The wedge-shaped window portion 5, the inner is formed to be concave as viewed around the pivot axis C _1, the wedge face 8 is formed on the outer side of the peripheral portion 5A. The wedge-shaped window portions 5 and 5 are configured so as to form a (wedge-shaped) space portion between the wedge surface 8 and the gear portion 4, and the clamped member 6 is movably fitted in the space portion. Has been. That is, in the first member 1, the wedge-shaped window portion 5 (the wedge surface 8) is a pressure contact portion 10 with the sandwiched member 6, and the thick portion 29 is formed on the peripheral portion 5 </ b> A of the wedge-shaped window portion 5. As a result, the strength and rigidity of the wedge-shaped window 5 serving as the pressure contact portion 10 are locally improved, and the contact surface pressure is reduced. In addition, the wedge-shaped window portion 5 includes a retracting space portion 15 that accommodates the pinched member 6 and releases the meshed state of the tooth surface 7 and the gear portion 4. The reason why the thick portion 29 is formed over the entire periphery 5A of the wedge-shaped window portion 5 is to avoid stress concentration.

As shown in FIGS. 3 and 5, the second member 2, the thick portion 29 is formed along the gear portion 4 formed around the pivot axis C _1.
In the second member 2, the gear portion 4 is a pressure contact portion 20 with the pinched member 6, and the thick portion 29 is formed along the gear portion 4, so that the gear portion as the pressure contact portion 20 is formed. 4 strength and rigidity are locally improved and the contact surface pressure is reduced.

The second member 2 has a gear portion 4 in which a large number of teeth are formed in a range (100 ° to 120 °) whose central angle slightly exceeds 90 ° (10 ° to 30 °) when viewed from the swing axis C _1. have. The second member 2 has a push-back protrusion 25 on one end side (upper side) of the gear part 4, and has an extrusion protrusion 24 on the other end side (lower side) of the gear part 4. . The thick portion 29 is also formed on the push-back protrusion 25 and the push-out protrusion 24.

Further, the second member 2 has a pair of facing plate portions 23, 23 in which the gear portion 4 is formed, and the facing plate portions 23, 23 have a circular bearing hole centered on the swing axis C _1. 26 and 26 are formed, and a thick portion 29 is formed over the entire circumference of the bearing holes 26 and 26.
The second member 2 has a cylindrical attachment piece 19 extending from the facing plate portions 23, 23. Further, the second member 2 can accommodate the facing plate portions 23, 23 between the wall portions 17, 17 (case portion 30) of the first member 1. That is, the facing plate portions 23 and 23 of the second member 2 are sandwiched between the wall portions 17 and 17 of the first member 1, and the pivot shaft 13 is connected to the through holes 12 and 12 of the first member 1. The first member 1 and the second member 2 are pivotably connected by being inserted into the bearing holes 26 and 26 of the two members 2 and fixed by caulking one end. That is, in the first member 1, the through holes 12, 12 are the sliding contact portions 11 with the pivot shaft 13, and in the second member 2, the bearing holes 26, 26 are slid with the pivot shaft 13. It is the contact part 21. The first member 1 and the second member 2 have the strength and rigidity of the sliding contact portions 11 and 21 with the pivot shaft 13 by forming the thick portions 29 in the through holes 12 and 12 and the bearing holes 26 and 26. Is improved locally and the contact surface pressure is reduced.

As shown in FIGS. 1 to 3, the first member 1 has a resilient member 14 that resiliently urges the pinched member 6 in a direction to press against the gear portion 4. The elastic member 14 is a metal spring member. Both end portions are fixed to the case portion 30, and the central portion is in contact with the central region of the contact surface 9 of the pinched member 6. Further, the first member 1 includes a foreign matter intrusion prevention member 16 that surrounds the case portion 30 from above. The foreign matter intrusion prevention member 16 prevents foreign matter from entering between the gear portion 4 and the pinched member 6.
Furthermore, a fall prevention cover 33 is provided so as to surround the case portion 30 of the first member 1 from the left and right outside. The dropout prevention cover 33 prevents the pinched member 6 from dropping from the wedge-shaped window portion 5.

Next, a method for manufacturing the above-described angle adjusting bracket will be described.
The manufacturing method of the angle adjusting bracket will be described with reference to FIGS. 6 to 8 taking the second member 2 which is a component of the angle adjusting bracket of the present invention as an example. A sheet metal material of a predetermined shape punched by sheet metal plastic working The standing piece portion 41 is formed along the outer peripheral edge 40A of 40 or the inner peripheral edge 40B of the through hole. Next, the standing piece portion 41 is crushed from the tip edge 42 side to form the thick portion 29.
At this time, the upright piece 41 is formed on the sheet metal material 40 shown in FIG. 11 by sheet metal plastic working (press work). As shown in FIG. 12, the standing piece 41 is formed by bending the outer peripheral edge 40A and the through-hole inner peripheral edge 40B of the sheet metal material 40 into an L shape. Then, as shown in FIG. 13, the thickened portion 29 having a predetermined width dimension W is formed by crushing from the side of the leading edge 42 of the standing piece portion 41 by sheet metal plastic working (press work). In contrast to the unprocessed sheet thickness dimension T _{0 of} the sheet metal material 40 shown in FIG. 11, the reinforcing section sheet thickness dimension T ₁ of the thick portion 29 in FIG. 13 is set to 1.5 to 2.5 times. . Further, the width dimension W of the thick portion 29 is set to 1.5 to 2.5 times the unprocessed sheet thickness dimension T ₀ of the sheet metal material 40.

As shown in FIG. 9, the gear portion 4 is formed along the outer peripheral edge 40 </ b> A of the sheet metal material 40 (the outer peripheral edge of the facing plate portion 23), and then, as shown in FIG. 10, the facing plate portions 23 and 23. The second member 2 is manufactured by sheet metal plastic working (bending) so as to face each other.
Although not shown in the drawings, the manufacturing method of the first member 1 performs the same processing on the inner peripheral edge of the through-hole of the sheet metal material punched into a predetermined shape to form the wedge-shaped window portion 5 and the peripheral portion of the through-hole 12. Since it is a method of forming the thick part 29, description is abbreviate | omitted.

Next, the angle adjustment function of the first member 1 and the second member 2 will be described. 2 and 3, the tooth surface 7 of the pinched member 6 is engaged with the gear portion 4, the wedge surface 8 is in contact with the contact surface 9, and the second member 2 is in contact with the first member 1. Restricts (locks) swinging in one direction.
At this time, since the thickened portion 29 is formed in the wedge-shaped window portion 5, the strength and rigidity are improved (with the pressure contact portion 10 reinforced), the contact surface pressure is reduced, and the wedge surface 8 comes into contact. The force from the surface 9 can be received with certainty. That is, the durability of the first member 1 is high and failure can be prevented as compared with the conventional product in which the wedge-shaped window portion 5 has cracked after about 3000 uses. Further, since the thick portion 29 is formed along the gear portion 4, the strength and rigidity are improved (the press contact portion 20 is reinforced), and the contact surface pressure between the gear portion 4 and the tooth surface 7 is low. Become. Therefore, the danger that a large torque will act on the gear part 4 will be reduced, the durability of the second member 2 will be high, and failure can be prevented.

When the second member 2 is swung in the other direction with respect to the first member 1, the contact surface 9 of the pinched member 6 is separated from the wedge surface 8, and the tooth surface 7 clicks the gear portion 4 and makes a sound. Stand up and get over. When the second member 2 swings over a predetermined angle with respect to the first member 1, the push-back protrusion 25 presses the pinched member 6 to release the engagement between the tooth surface 7 and the gear portion 4, and swings. It becomes movable (free) state. Then, when the second member 2 is swung in one direction with respect to the first member 1, the pushing projection 24 pushes the pinched member 6 from the retreat space 15 and meshes the tooth surface 7 and the gear portion 4. The first member 1 and the second member 2 can be maintained at an arbitrary folding angle (inclination angle).
Since the first member 1 and the second member 2 are formed in the sliding contact portions 11 and 21 (the through hole 12 and the bearing hole 26) with the pivot shaft 13, the thick portion 29 is formed. The strength and rigidity of 21 are improved, the contact surface pressure is reduced, the durability is high, and the durability is long.

  The design of the present invention can be changed, and for example, the foreign matter intrusion prevention member 16 or the dropout prevention cover 33 may be omitted.

As described above, the angle-adjustable hinge according to the present invention, the angle-adjustable hinge in which the first member 1 and second member 2 which is fabricated from sheet metal material is cross swingably pivotally connected to the pivot axis C ₁ around And having a pinched member 6 that is held between the first member 1 and the second member 2 and restricts the second member 2 from swinging in one direction with respect to the first member 1. Since the thickened portion 29 having the increased thickness T is formed by sheet metal plastic working at the press contact portions 10 and 20 of the first member 1 and the second member 2 with respect to the pressed member 6, the first member 1 In addition, the strength and rigidity of the press contact portions 10 and 20 of the second member 2 can be improved, cracks and fatigue failure can be prevented, and the contact surface pressure between the press contact portions 10 and 20 and the pinched member 6 can be reduced. Since it is possible to locally strengthen the press contact portions 10 and 20 against the sandwiched member 6 while reducing the overall thickness T of the first member 1 and the second member 2, the cost of raw materials can be kept low, And manufacture of the 1st member 1 and the 2nd member 2 by sheet metal plastic working becomes easy.

  In addition, the first member 1 and the second member 2 are pivotally connected by the pivot shaft 13, and the thick portion 29 having an increased plate thickness T is formed on the sliding contact portions 11 and 21 with the pivot shaft 13. Since it was formed by sheet metal plastic working, the strength and rigidity of the sliding contact portions 11 and 21 with the pivot shaft 13 can be improved, and the contact surface pressure between the sliding contact portions 11 and 21 and the pivot shaft 13 can be reduced. Since the sliding contact portions 11 and 21 with the pivot shaft 13 can be locally strengthened while reducing the thickness T of the first member 1 and the second member 2 as a whole, the cost of raw materials can be kept low. And manufacture of the 1st member 1 and the 2nd member 2 by sheet metal plastic working becomes easy.

  Further, the pinched member 6 has a tooth surface 7 that can be meshed with the gear portion 4 formed on the second member 2 on one surface side and a contact surface that contacts the wedge surface 8 formed on the first member 1 on the other surface side. The tooth surface 7 is meshed with the gear portion 4 and the contact surface 9 is in contact with the wedge surface 8 so as to restrict the second member 2 from swinging in one direction with respect to the first member 1. Therefore, even if the pinched member 6 is a compact and small member, it can handle a large load and have sufficient strength.

The first member 1, the thick portion 29 is formed over the peripheral portion 5A entire circumference of the wedge-shaped window portion 5 having a wedge surface 8, the second member 2 is formed around the pivot axis C ₁ Since the thick portion 29 is formed along the gear portion 4, stress concentration can be avoided at the press contact portions 10 and 20 (with respect to the pressed member 6), and cracks and fatigue failure can be reliably ensured. Can be prevented.

Further, the first member 1 has a pair of facing wall portions 17, 17, and circular through holes 12, 12 centering on the swing axis C ₁ are formed in the wall portions 17, 17. A thick portion 29 is formed over the entire circumference of 12, 12, and the second member 2 includes a pair of facing plate portions 23, in which the gear portion 4 is formed and accommodated between the pair of wall portions 17, 17. has 23, circular bearing hole 26, 26 around the pivot axis _{C 1} in the facing plate portions 23, 23 are formed by the thick portion 29 is formed over the entire circumference of the bearing hole 26, 26 Therefore, stress concentration can be avoided in the sliding contact portions 11 and 21 with the pivot shaft 13, and cracks and fatigue failure can be reliably prevented.

  Moreover, according to the manufacturing method of the angle adjustment metal fitting which concerns on this invention, along the outer peripheral edge 40A or the through-hole inner peripheral edge 40B of the predetermined-shaped sheet metal raw material 40 pierced by sheet metal plastic working, a standing piece part 41, and then the standing piece portion 41 is crushed from the tip edge 42 side to form the thick portion 29, so that a portion where cracks and fatigue breakage are likely to occur (pressure contact portion against the pinched member 6) 10, 20 or the sliding contact portions 11, 21) with the pivot shaft 13, the thick portion 29 can be formed, the strength and rigidity can be improved locally, and the contact surface related to the press contact / slide Pressure can be reduced. In this way, cracks and fatigue failure can be prevented from occurring in the component, and an angle adjusting bracket with few failures can be manufactured.

DESCRIPTION OF SYMBOLS 1 1st member 2 2nd member 4 Gear part 5 Wedge-shaped window part 5A Peripheral part 6 Clamped member 7 Tooth surface 8 Wedge surface 9 Abutting surface 10 Pressure contact part 11 Sliding contact part 12 Through-hole 13 Pivoting shaft 17 Wall Part 20 Pressure contact part 21 Sliding contact part 23 Face-to-face plate part 26 Bearing hole 29 Thick part 40 Sheet metal material 40A Outer peripheral edge 40B Through hole inner peripheral edge 41 Standing piece part 42 Tip edge C ₁ Oscillation axis T ₀ Before processing Thickness dimension T ₁ Thickening section thickness dimension W Width dimension

Claims (1)

Used for seat chairs and the like having a back portion and a seat portion, and the first member (1) and the second member (2) made of a sheet metal material can swing around the swing axis (C ₁ ). A pivoted angle adjustment bracket,
The second member (2) has a gear portion (4) in which a large number of teeth are formed around the swing axis (C ₁ ), and the first member (1) includes the gear portion ( 4) with a wedge surface (8) forming a wedge-shaped space between
The clamped member (6) is held in the wedge-shaped space between the wedge surface (8) of the first member (1) and the gear portion (4) of the second member (2). The pinched member (6) has a tooth surface (7) having a plurality of teeth meshable with the gear portion (4) on one surface side, and contacts the wedge surface (8) on the other surface side. The second member (9) has a contact surface (9) in contact with the tooth surface (7) meshing with the gear portion (4) and the corresponding contact surface (9) is in contact with the wedge surface (8). 2) is configured to restrict swinging in one direction relative to the first member (1),
The first member (1) is an upright piece formed by bending a through-hole inner peripheral edge (40B) of a sheet metal material (40) of a predetermined shape punched by sheet metal plastic working into an L shape by press working. The portion (41) is crushed by pressing from the tip edge (42) side to form a thick portion (29) having a locally increased thickness, and the thick portion (29) Provided on the wedge surface (8), which is the pressure contact portion (10) of the first member (1) with respect to the sandwiched member (6), to reinforce the wedge surface (8);
The second member (2) is an upright piece (41) formed by bending an outer peripheral edge (40A) of a sheet metal material (40) having a predetermined shape punched by sheet metal plastic working into an L shape by pressing. ) Is crushed by pressing from the tip edge (42) side to form a thick portion (29) having a locally increased thickness, and the thick portion (29) Provided in the gear part (4), which is a pressure contact part (20) of the second member (2) with respect to the member (6), to reinforce the gear part (4);
The thick portions (29) and (29) are formed over a width dimension (W) that is 1.5 to 2.5 times the plate thickness dimension (T ₀ ) before processing of the sheet metal material (40), and By increasing the thickness locally to an increased thickness (T ₁ ) of 1.5 to 2.5 times the pre-processing thickness (T ₀ ), the pressure contact parts (10), (20) and While reducing the contact surface pressure with the said to-be-clamped member (6), the said press-contact part (10) (20) with respect to the reaction force which this press-contact part (10) (20) receives from this to-be-clamped member (6) An angle adjusting bracket characterized in that it is configured to improve locally the strength and rigidity.

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