JP7235704B2 - resistance applying device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistance applying device that applies resistance torque to a rotatable rotating body within a required angle range.

Conventionally, a locking mechanism having a deadbolt that advances and retreats under bias is well known. Patent Literature 1 listed below discloses an example of the locking mechanism, which will be described with reference to FIG. Assuming that the locking mechanism disclosed in Patent Document 1 is X, FIG. 7A shows a state when the locking mechanism X is unlocked, and FIG. 7B shows a state when the locking mechanism X is locked.

In addition to the deadbolt DB, the locking mechanism X is provided with a so-called daruma doll RM which is driven to rotate by an operation force of the duplicate key inserted therein, and an urging means HM for urging the daruma doll RM. The daruma doll RM has a driving arm KA extending radially outward from its own center of rotation, and the driving arm KA is also turned by rotating the daruma doll RM. The tip of the driving arm KA is located in the recess CP formed in the deadbolt DB and can be engaged with the deadbolt DB here, and the daruma doll RM turns to engage the tip of the driving arm KA with the deadbolt DB. By doing so, the deadbolt DB is moved back and forth. The biasing means HM comprises a tente-shaped push-down member PM, the proximal end of which is rotatably connected to the distal end of the drive arm KA of the doll RM by a pivot pin RP. The tip of the push-down member PM is inserted into the support hole SH of the support shaft SS which is rotatably erected. Also advances and retreats against At this time, the spring member S is inserted through the core of the push-down member PM, and one end of the spring member S abuts against the outer peripheral surface of the support shaft SS. A repulsive force is imparted. As a result, when the Daruma doll RM rotates clockwise in FIG. 7(a), the pivot pin RP connecting the driving arm KA and the push-down member PM connects the rotation center of the Daruma doll RM and the support shaft SS. The daruma doll RM is urged counterclockwise by the urging means HM, that is, in a direction opposite to the rotating direction of the daruma doll RM, until it crosses the straight line L (chain line). On the other hand, when the pivot pin RP crosses the straight line L and rotates clockwise, the daruma doll RM is urged clockwise by the urging means HM, that is, in the same direction as the rotation direction of the daruma doll RM. When the doll RM is urged clockwise to rotate, the dead bolt DB is also urged to advance, and the dead bolt DB is stopped by the engagement between the restricting protrusion PS and the guide groove GG. In the locking mechanism disclosed in Patent Document 1, when the Dharma doll RM is rotationally driven by the operating force of the duplicate key, the deadbolt DB stops at an intermediate position to ensure locking. It is required that the advance amount set in advance is surely advanced without fail. Therefore, the deadbolt DB is biased forward.

JP 2012-77586 A

In the locking mechanism disclosed in Patent Literature 1, the deadbolt DB is pushed forward for the reasons described above, so that when the limiting protrusion PS and the guide groove GG are engaged with each other, a collision sound is produced. occur. In order to reduce such collision noise, in the locking mechanism X, the deadbolt DB is connected to the oil damper OD by a rack and pinion system, and resistance torque is applied to the deadbolt DB. Therefore, in the locking mechanism X, the deadbolt DB may stop at an intermediate position due to the constant resistance torque applied to the deadbolt DB from the oil damper OD. This is because the resistance torque is applied by the oil damper OD in the final stage of the advance process of the deadbolt DB, although the force applied by the force applying means HM is weak.

Also, the oil damper OD has a housing in which a relatively highly viscous fluid such as silicon oil is enclosed, and a rotating member rotatably mounted in the housing. Since a resistance torque in the opposite direction is applied to the rotating member, there is a risk that the enclosed fluid will leak to the outside. Furthermore, since the viscous resistance of a fluid generally changes with temperature, the resistance torque applied by the oil damper changes between summer when the temperature is high and winter when the temperature is low.

The present invention has been made in view of the above-mentioned facts, and its main technical problem is to provide a rotary body that can rotate within a required angle range with a simple structure without using an oil damper. To provide a novel resistance applying device capable of applying resistance torque only in an angle range. Just to be sure, the above technical problem may occur not only in the locking mechanism disclosed in Patent Document 1, but also in various machine tools, mechanical devices, and the like.

According to the present invention, as a resistance applying device that can solve the above main technical problems, a resistance applying device that applies a resistance torque to a rotating body that can rotate within a required angle range,
At least one axial end of the rotating body is inserted into a fixed housing, and axial movement of the rotating body is restricted by the housing,
A friction plate is further disposed within the housing and axially adjacent to the rotating body, and the friction plate is restricted from moving in the circumferential direction by the housing, but allowed to move in the axial direction. The plate is biased toward the rotating body by a spring member,
A regulating projection projecting in the axial direction is provided on the rotor, and a regulating recess into which the regulating projection is inserted is provided on the friction plate, and the regulating recess extends circumferentially over the required angle. exists, and
A one-side protruding portion and the other-side protruding portion protruding in the axial direction extend in the circumferential direction on axial end surfaces of the rotating body and the friction plate that face each other in the axial direction,
When the rotating body rotates, the one-side protruding portion shifts from the first region overlapping the other-side protruding portion in the axial direction to the second region where they are separated in the circumferential direction, or from the second region to the second region. When it moves to one area and the one-side protrusion is in the first area, the axial end surfaces of the one-side protrusion and the other-side protrusion are in close contact with each other, and the resistance torque is applied to the rotating body. There is provided a resistance applying device characterized by:

Preferably, the required angular range is smaller than 180 degrees, and the one-side protrusion and the other-side protrusion are provided in pairs on opposite sides in the diametrical direction. It is preferable that one circumferential end of one or both of the one-side protruding portion and the other-side protruding portion is connected to an inclined portion whose amount of axial protrusion gradually decreases toward one side in the circumferential direction. .

In the resistance applying device of the present invention, the one-side protruding portion and the other-side protruding portion protruding in the axial direction extend in the circumferential direction on the axial end surfaces of the rotating body and the friction plate, which face each other in the axial direction. rotates, the one-side protrusion moves from the first region overlapping the other-side protrusion in the axial direction to or from the second region to the first region where they are circumferentially separated from each other. Since the friction plate is urged toward the rotating body by the spring member, when the one-side protrusion is in the first region, the axial end faces of the one-side protrusion and the other-side protrusion rotate in close contact with each other. A resistive torque is applied to the body. Therefore, with a simple structure, it is possible to apply resistive torque only in an arbitrary angle range within the required angle range to a rotating body that can rotate within the required angle range.

1 is a diagram showing the overall configuration of a resistance applying device configured according to the present invention; FIG. FIG. 2 is an exploded perspective view of the resistance applying device shown in FIG. 1; FIG. 2 is a diagram showing a single rotating body of the resistance applying device shown in FIG. 1 ; The figure which shows the housing of the resistance application apparatus shown in FIG. 1 alone. FIG. 2 is a diagram showing a single friction plate of the resistance applying device shown in FIG. 1 ; 4A and 4B are views for explaining the operation of the resistance applying device shown in FIG. 1; FIG. The figure which shows the conventional locking mechanism.

Reference will now be made in more detail to the accompanying drawings which illustrate preferred embodiments of a resistance applying device constructed in accordance with the present invention. Unless otherwise specified, "one side in the axial direction" and "other side in the axial direction" in the following description are based on the state shown in the AA cross section of FIG. The left side and "the other side in the axial direction" refer to the right side in the figure.

Referring to FIG. 1, a resistance applying device constructed in accordance with the present invention and designated generally by reference numeral 2 comprises a rotor 4 rotatable about a central axis o. 2 and 3 together with FIG. 1, the rotating body 4 has a generally cylindrical shape, and a connecting portion connected to a deadbolt by, for example, a rack-and-pinion method at the other end in the axial direction. 6 is provided. In the illustrated embodiment, the connecting portion 6 includes a pair of connecting projecting pieces 8 axially protruding from the other axial side end surface of the rotating body 4 and a pair of locally recessed portions at the axial other side end surface of the rotating body 4 . and a connection recess 10 . Each of the pair of connecting projecting pieces 8 and each of the pair of connecting recesses 10 are located diametrically opposite to each other, and the connecting projecting pieces 8 and the connecting recesses 10 are arranged at an angular interval of 90 degrees. A one-side protruding portion 12 that protrudes in the axial direction extends in the circumferential direction from the one-side end surface of the rotating body 4 in the axial direction. In the upper left view of FIG. 3, the one-sided protruding portion 12 is shown with light ink for easy understanding. Mainly referring to the upper left side view of FIG. 3, in the illustrated embodiment, a pair of one-sided projecting portions 12 are provided on opposite sides in the diametrical direction. Each of the pair of one-side protruding portions 12 has a fan shape with a central angle of 35 degrees, and has a width narrower in the circumferential direction than the other-side protruding portion 46 described later. A one-side inclined portion 14 is connected to the counterclockwise side end of each of the pair of one-side protrusions 12, the axial protrusion amount of which gradually decreases in the counterclockwise direction. The one-sided inclined portion 14 extends linearly. As can be understood by referring to the lower left side view of FIG. 3, a restricting protrusion 16 is further formed on one axial end surface of the rotating body 4 so as to protrude in the axial direction. One restricting protrusion 16 is arranged in the middle of each of the pair of one-sided protrusions 12 when viewed in the circumferential direction, and its cross section has a fan shape with a central angle of 40 degrees. An annular locking projection 18 projecting radially outward is formed on the outer peripheral surface of one axial end of the rotating body 4 .

As shown in FIG. 1, one axial end of the rotor 4 is inserted into the housing 20 . The housing 20 will be described with reference to FIGS. 2 and 4 together with FIG. and a cylindrical outer peripheral wall 24 extending toward. A circular through hole 26 is formed in the center of the end plate 22 . A pair of fixing pieces 28 each having an arcuate cross-section and protruding in the axial direction are formed on one end face of the end plate 22 in the axial direction on opposite sides in the diametrical direction. The housing 20 as a whole is fixed to the fixed wall (not shown) by engaging the pair of fixed pieces 28 with the fixed wall. Four engaging grooves 30 having a substantially rectangular cross section extending linearly in the axial direction are formed in the inner peripheral surface of the outer peripheral wall 24 at equal angular intervals in the peripheral direction. A guide groove 32 extending in the circumferential direction is also formed on the inner peripheral surface of the outer peripheral wall 24 . The guide groove 32 is formed on the other side of the outer peripheral wall 24 in the axial direction. A locking projection 34 is defined which projects radially inwardly due to the presence of the . Due to the presence of the locking groove 30, four locking projections 34 are provided at equal angular intervals in the circumferential direction. The locking projection 18 of the rotating body 4 is fitted into the guide groove 32 by elastically overriding the locking projection 34 , and the locking projection 34 prevents the locking projection 18 from coming off. Therefore, the groove width of the guide groove 32 is somewhat larger than the width of the locking projection 18 . As a result, the rotating body 4 is allowed to move in the circumferential direction by the housing 20, but is restricted from moving in the axial direction.

As shown in FIG. 1, a friction plate 36 is also disposed within the housing 20 and axially adjacent to the rotor 4 . 2 and 5 together with FIG. 1, the friction plate 36 protrudes radially outward from a circular main portion 38 arranged perpendicular to the central axis o and the outer peripheral surface of the main portion 38. A substantially rectangular locking piece 40 is provided. Four locking pieces 40 are formed at equal angular intervals in the circumferential direction, and the four locking pieces 40 are aligned with the four locking grooves 30 formed in the inner peripheral surface of the outer peripheral wall 24 of the housing 20, respectively. By locking, the friction plate 36 is restricted from moving in the circumferential direction by the housing 20, but is allowed to move in the axial direction. A circular through hole 42 is formed in the center of the main portion 38 . The through hole 42 is provided with an arcuate restricting recess 44 whose outer peripheral edge is locally enlarged. 6 together with FIGS. 1 and 2, the restricting protrusion 16 of the rotating body 4 is inserted into the restricting recess 44, and the restricting recess 44 controls the rotation of the rotating body 4 within the required angle range. to regulate. In the illustrated embodiment, the restricting recess extends over an angular range of 180 degrees, and the cross section of the restricting projection 16 is fan-shaped with a central angle of 40 degrees, so the required angular range is 140 degrees. degree. On the axial end surface of the friction plate 36 facing the rotor 4 , that is, on the other axial end surface of the friction plate 36 , an axially projecting other-side projecting portion 46 extends in the circumferential direction. In the upper left view of FIG. 5 and FIG. 6, the projecting portion 46 on the other side is shown with light ink for easy understanding. Mainly referring to the upper right view of FIG. 5, in the illustrated embodiment, a pair of the other-side projecting portions 46 are provided on opposite sides in the diametrical direction. Each of the pair of other-side protrusions 46 has a substantially fan shape with a central angle of 110 degrees (however, part of the inner peripheral edge is removed by the regulation recess 44), and is wider than the one-side protrusion 12 in the circumferential direction. is wide. The counterclockwise end of each of the pair of other-side protruding portions 46 is connected to the other-side inclined portion 48 whose axial protrusion amount gradually decreases in the counterclockwise direction. The other-side inclined portion 48 extends linearly.

The friction plate 36 described above is biased toward the rotor 4 by the spring member 52 . In the illustrated embodiment, the spring member 52 is a metal wave washer that extends inside the friction plate 36 before it is accommodated in the housing 20 and, as shown in FIG. 22 and the friction plate 36 .

Next, the operation of the resistance applying device 2 will be described with reference to FIG. 6 together with FIG. 6(a) to 6(c) are cross-sections taken along the line BB in FIG. 1, showing the positional relationship between the rotor 4 and the friction plate 36 when the rotor 4 is rotated within the required angular range. is shown. As will be described later, both FIGS. 6B and 6C show a state in which the close contact between the axial end surfaces of the one-side protruding portion 12 and the other-side protruding portion 46 is released. The plate 36 is slightly displaced to the other side in the axial direction from the position shown in the AA section of FIG. 1, but this is shown as not being displaced in the BB section of FIGS. there is

In the state shown in FIG. 6(a), the regulating projection 16 of the rotating body 4 is located at the clockwise end in the regulating recess 44 formed in the friction plate 36, and the regulating projection 16 rotates clockwise. The direction end face abuts the circumferential side face of the friction plate 36 defining the clockwise end of the regulation recess 44 . Since the rotor 4 cannot rotate clockwise from the state shown in FIG. 6(a), the state shown in FIG. 6(a) is the start point (or end point) of the required angle range. At this time, the one-side projecting portion 12 of the rotor 4 and the other-side projecting portion 46 of the friction plate 36 overlap each other when viewed in the axial direction, and the one-side projecting portion 12 is positioned at the clockwise end of the other-side projecting portion 46 . . Here, since the friction plate 36 is allowed to move in the axial direction by the housing 20 and is biased toward the rotating body 4 by the spring member 52, the axial end surface of the one-sided protrusion 12 is the friction plate 36. is in close contact with the axial end face of the other side protrusion 46 of the . When the rotating body 4 rotates counterclockwise from this state, since the circumferential movement of the friction plate 36 is restricted by the housing 20, the axial end surface of the other-side projecting portion 46 and the one-side projecting portion 12 are in close contact with each other. Resistance torque is applied to the rotating body 4 due to friction with the axial end face. Here, when the rotating body 4 rotates, the region where the one-side protrusion 12 overlaps the other-side protrusion 46 when viewed in the axial direction is defined as a first region and denoted by reference numeral 54 .

From the state shown in FIG. 6( a ), until the rotating body 4 rotates counterclockwise and the one-side protruding portion 12 reaches the other-side inclined portion 48 connected to the circumferential end of the other-side protruding portion 46 , there is no rotation. A constant resistive torque is applied to the body 4 . When the one-side protruding portion 12 passes through the other-side inclined portion 48 connected to the circumferential end of the other-side protruding portion 46, the axial end surface of the one-side protruding portion 12 and the axis of the other-side protruding portion 46 are in close contact with each other. Since the area with the direction end surface is gradually reduced, the resistance torque is gradually reduced.

Then, as shown in FIG. 6B, when the one-side protruding portion 12 passes through the other-side inclined portion 48 and is separated from the other-side protruding portion 46 in the axial direction, the axial end face of the one-side protruding portion 12 and The close contact with the axial end surface of the projecting portion 46 on the other side is released, and the resistance torque is not applied to the rotor 4 . At this time, the rotor 4 and the friction plate 36 may be separated completely. Then, as shown in FIG. 6(c), the restricting protrusion 16 of the rotating body 4 reaches the counterclockwise end of the restricting recess 44 of the friction plate 36, and the counterclockwise end face of the restricting protrusion 16 reaches the restricting recess 44. The counterclockwise rotation of the rotating body 4 is completed by coming into contact with the circumferential surface of the friction plate 36 defining the counterclockwise end. Therefore, the state shown in FIG. 6(c) is the end point (or start point) of the required angle range. Here, when the rotating body 4 rotates, a second region, indicated by reference numeral 56, is defined as a region in which the one-side protruding portion 12 is separated from the other-side protruding portion 46 in the axial direction in the circumferential direction.

In the resistance applying device of the present invention, the one-side protruding portion 12 and the other-side protruding portion 46, which protrude in the axial direction, extend in the circumferential direction from the axial end surfaces of the rotor 4 and the friction plate 36, which face each other in the axial direction. When the rotating body 4 rotates, the one-side protrusion 12 shifts from the first region 54 overlapping the other-side protrusion 46 when viewed in the axial direction to the second region 56 where the two are separated in the circumferential direction (or the second region 56). (from region 56 to first region 54). Since the friction plate 36 is biased toward the rotating body 4 by the spring member 52, when the one-side protrusion 12 is in the first region 54, the axial end faces of the one-side protrusion 12 and the other-side protrusion 46 are brought into close contact with each other, and resistance torque is applied to the rotor 4 . Therefore, with a simple structure, it is possible to apply resistance torque only within an arbitrary angle range within the required angle range to the rotating body 4 that can rotate within the required angle range.

When the rotating body 4 rotates clockwise from the state shown in FIG. 6C to the state shown in FIG. In the illustrated embodiment, the one-side inclined portion 14 and the other-side inclined portion 48 are connected to the circumferential ends of both the one-side projecting portion 12 of the rotor 4 and the other-side projecting portion 46 of the friction plate 36. Then, as the one-side protrusion 12 moves clockwise, the other-side protrusion 46 is automatically pushed down and rides on the axial end face thereof, and the axial end face of the one-side protrusion 12 of the rotating body 4 and the friction plate are again engaged. 36 is brought into close contact with the axial end face of the other side projecting portion 46 . In the illustrated embodiment, by connecting inclined portions to the circumferential ends of both the one-side protruding portion 12 of the rotor 4 and the other-side protruding portion 46 of the friction plate 36 , the friction plate is tilted due to the rotation of the rotor 4 . 36 is automatically displaced, but the friction plate 36 is temporarily forcibly displaced manually by a separate operating means (not shown) such as a lever, and the axial end surface of the one-sided protruding portion 12 of the rotating body 4 is again displaced. The friction plate 36 may be brought into close contact with the axial end face of the other-side projecting portion 46 .

When the resistance applying device 2 is used as a deadbolt damper in the locking mechanism described above, it is preferable to apply a resistance torque to the deadbolt at the beginning of its advance.

As described above, the resistance applying device configured according to the present invention has been described in detail with reference to the accompanying drawings. or change is possible. For example, in the illustrated embodiment, the size of the required angular range in which the rotating body can rotate is determined by cooperation between the restricting projections of the rotating body and the restricting recesses of the friction plates. , the regulating protrusion and the regulating recess are interchangeable. Also, the regulating protrusion and the regulating recess may be formed on the rotating body and the housing, respectively. Also, the circumferential width and the amount of axial protrusion of the one-side protruding portion of the rotor and the other-side protruding portion of the friction plate can be appropriately set. Furthermore, the rotating body, housing and friction plates may be made of synthetic resin or metal, and are appropriately selected according to the intended use.

2: Resistance applying device 4: Rotating body 12: Protruding part on one side 20: Housing 36: Friction plate 46: Protruding part on the other side 52: Spring member 54: First region 56: Second region

Claims (3)

A resistance applying device that applies resistance torque to a rotatable rotating body within a required angle range,
At least one axial end of the rotating body is inserted into a fixed housing, and axial movement of the rotating body is restricted by the housing,
A friction plate is further disposed within the housing and axially adjacent to the rotating body, and the friction plate is restricted from moving in the circumferential direction by the housing, but allowed to move in the axial direction. The plate is biased toward the rotating body by a spring member,
A regulating projection projecting in the axial direction is provided on the rotor, and a regulating recess into which the regulating projection is inserted is provided on the friction plate, and the regulating recess extends circumferentially over the required angle. exists, and
A one-side protruding portion and the other-side protruding portion protruding in the axial direction extend in the circumferential direction on axial end surfaces of the rotating body and the friction plate that face each other in the axial direction,
When the rotating body rotates, the one-side protruding portion shifts from the first region overlapping the other-side protruding portion in the axial direction to the second region where they are separated in the circumferential direction, or from the second region to the second region. When the one-side protruding portion is in the first region, the axial end surfaces of the one-side protruding portion and the other-side protruding portion come into close contact with each other, and the resistance torque is applied to the rotating body. A resistance applying device characterized by: 2. The resistance applying device according to claim 1, wherein said required angle range is smaller than 180 degrees, and said one-side protrusion and said other-side protrusion are provided in pairs on opposite sides in a diametrical direction. 2. An inclined portion whose axial protrusion amount gradually decreases toward one circumferential direction is connected to one circumferential end of one or both of the one-side protrusion and the other-side protrusion. 3. Or the resistance applying device according to 2 .

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