JP4958320B2 - Rotation operation mechanism using coil spring - Google Patents

Description

The present invention relates to a one-way clutch .

2. Description of the Related Art Conventionally, a coil spring type one-way clutch that transmits a drive side rotation to a driven side only in one direction is known.

A conventional coil spring type one-way clutch is locked with a structure in which one end of a coil spring that receives a load in the locking direction is inserted and disposed in a groove of a member. For this reason, if an excessive rotational force acts in the locking direction on the one end locking portion of the coil spring, an excessive load in the refraction direction may be applied to the one end locking portion of the coil spring, causing damage.
The present invention aims to solve the above problems.

In order to achieve the above object, the present invention provides a shaft (6), a coil spring (72) fitted and arranged on the outer peripheral surface of the shaft (6), and a drive side rotatable with respect to the shaft (6). The drive side of the drive side member (9) is transmitted to one end of the coil spring (72) so that the drive force of the drive side member (9) in the forward and reverse directions with respect to the shaft (6) is transmitted. One end of the coil spring (72) is connected to the member (9), and the driving member (9) is changed by changing the direction of the driving force of the driving member (9) with respect to the shaft (6). A rotational operation mechanism that can be fixed to or released from the shaft (6) via the coil spring (72), and is a member on the driving side at one end of the coil spring (72). From (9) The one end of the coil spring (72) is driven by this driving force, the coil spring (72) is wound around the outer peripheral surface of the shaft (6), and the coil spring ( 72), the driving side member (9) and the shaft (6) are fixed, and the driving force of the driving side member (9) is transferred to the shaft via one end of the coil spring (72). (6) , the connection portion between the drive side member (9) and one end of the coil spring (72) is pulled out, and one end of the coil spring (72) is pulled out to pull out (72c). and then, by rounding the distal end of the lead portion (72c) to form annular portion (72b), insert the screws (94) to該輪shaped portion (72b), said annular portion by a screw (94) and (72b) It is obtained by the serial fixed to the driving side of the member (9) configuration.

In the present invention, since a ring-shaped portion is provided at the end portion of the coil spring that receives the load in the locking direction, and the ring-shaped portion is fixed to the member with a screw, an excessive load is applied to the end portion of the coil spring in the locking direction. There is no risk of damage if applied.

It is sectional drawing of the AA line of the principal part of the raising / lowering apparatus which concerns on this invention. It is a left view of the principal part of a raising / lowering apparatus. It is a right view of the principal part of a raising / lowering apparatus. It is a top view of the principal part of a raising / lowering apparatus. It is a BB line cross section of the principal part of a raising / lowering apparatus, (A) shows the initial state of a belt pulley, (B) shows the state which rotated the belt pulley 1 time. It is an expanded sectional view of a rotation operation mechanism. It is an expanded sectional view of a belt pulley. It is an external view of the principal part of a raising / lowering apparatus. It is an external view of the coil spring used for this apparatus. It is a top view of a raising / lowering apparatus. It is a front view of a raising / lowering apparatus. It is a front view which shows other embodiment of a raising / lowering apparatus.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIGS. 10 and 11 show an elevating device for elevating the base member 4 such as a shelf arranged inside the frame 2 such as a refrigerator, and is provided inside the frame 2. The elevating device moves the base member 4 in the ascending / descending direction as the shaft 6 (rotating member), the belt 8 (long member) driven by the forward / reverse rotation of the shaft 6, and the rotation of the shaft 6. There are provided base member guide mechanisms 10 and 12 for guiding, and a rotary operation mechanism 14 having a coil spring type one-way clutch for intermittently rotating the shaft 6 in one direction by forward and reverse reciprocating rotational movement of the operation member 9. .

The pedestal member guide mechanisms 10 and 12 include left and right guide blocks 16 and 18 on which the pedestal member 4 is detachably mounted, and the guide blocks 16 and 18 formed on the side walls 2a and 2b of the frame 2, respectively. It is comprised by the raising / lowering guide part 20 and 22 which guides 18 slidably in an raising / lowering direction. The shaft 6 is disposed at the center of the lower surface of the upper frame 2 c of the frame 2. One end portion of the shaft 6 is rotatably supported on the upper frame 2 c in the vicinity of the open surface 2 d side of the frame 2 via a housing 24 (fixing member) of the rotation operation mechanism 14. The other end of the shaft 6 is rotatably supported by the upper frame 2c via the bracket 26 (fixing member), located near the rear frame 2e. In FIG. 10, the lower side of the drawing is the front of the apparatus, and the operation member 9 (lever) can be manually operated from the open surface 2 d side of the frame 2.

As shown in FIG. 7, a belt pulley 28 is fitted on the shaft 6 via a coil spring 30 having a torque limiter function. The belt pulley 28 includes a cylindrical peripheral body 28a and disk bodies 28b and 28c integrally formed at both ends thereof. The outer surfaces of the disk bodies 28b and 28c are provided by stopper rings 32 and 34, respectively. The shaft 6 is locked so as not to move in the axial direction. An inner peripheral surface 28 b ′ of the disc body 28 b is rotatably fitted to the outer peripheral surface of the shaft 6.

A cylindrical space portion having a diameter larger than the outer diameter of the shaft 6 is formed in the inner diameter portion of the peripheral surface body 28a and the disk body 28c, and the inner peripheral surface of the peripheral surface body 28a and the disk body 28c is formed by the space portion. A gap G is formed between the shaft 6 and the outer peripheral surface of the shaft 6. A coil spring 30 is fitted and disposed in the gap G so that the inner diameter portion thereof is in close contact with the outer peripheral surface of the shaft 6. One end straight portion 30a of the coil spring 30 is engaged with a groove 36 formed in the board body 28c, and one end 30a side of the coil spring 30 is locked to the board body 28c.

The coil spring 30 constitutes a power transmission mechanism that raises the base member 4 in FIG. 5 of the shaft 6 and transmits a clockwise rotational motion to the belt pulley 28 by frictional force. When the right rotational motion of the shaft 6 is loaded beyond a predetermined torque, the shaft 6 slides on the coil spring 30, the shaft 6 idles with respect to the belt pulley 28, and the coil spring 30 also functions as a torque limiter. It is configured. As shown in FIG. 5, the peripheral surface 28 a is formed with a recess 40 for receiving the pin 38.

Grooves 42 are formed on the conical side surfaces of the disk bodies 28b and 28c to guide both ends of the pin 38 in a linear direction so as to be slidable. As shown in FIG. 11, belt pulleys 44 and 46 are rotatably supported on the left and right sides of the upper frame 2c via pulley holders 48 and 50, and the belt 8 is hung thereon. Both end portions of the belt 8 are connected to guide blocks 16 and 18 that are supported by the elevation guide portions 20 and 22 of the side wall frames 2a and 2b so as to be movable up and down.

As shown in FIG. 5, the central portion of the belt 8 is hung on the outer peripheral surface of the peripheral surface body 28 a of the belt pulley 28, and the belt 8 is surrounded by the pin 38 having both ends inserted into the groove 42. It is pressed against the back end surface of the recess 40 and is locked to the recess 40 by a pin 38. The groove 42 is formed with an angle with respect to the direction of the pressing force of the belt 8 against the pin 38. With this angle, both ends of the pin 38 are not detached from the groove 42 by the pressure from the belt 8, and the belt 8 is locked to the deep end surface of the recess 40 at the deep end of the groove 42. 5A shows an initial state in which the belt 8 is fixed to the belt pulley 28, and FIG. 5B shows a state in which the belt pulley 28 is rotated once in the clockwise direction and the belt 8 is wound up. Yes.

When the shaft 6 rotates clockwise in FIG. 5, the belt 8 is wound around the belt pulley 28 and converges on the belt pulley 28. In FIG. 5, when the shaft 6 rotates clockwise and the belt 8 is wound around the belt pulley 28, as shown in FIG. 11, the guide blocks 16, 18 are guided by the elevating guides 20, 22, and are lifted up. The member 4 is configured to rise. When the shaft 6 rotates in the reverse direction and the belt 8 is fed out from the belt pulley 28, the guide blocks 16 and 18 are lowered by the weight of the base member 4, and in conjunction with this, the base member 4 is lowered by its own weight. Has been.

  The bracket 26 is fixed to the upper frame 2c, and the outer peripheral surface of the shaft 6 is rotatably fitted in the shaft hole 26a of the bracket 26 as shown in FIG. As shown in FIG. 1, a damper 58 is fixed to the bracket 26, and one end of the shaft 6 is coupled to a rotating shaft 60 of the damper 58. The damper 58 is a mechanism for imparting resistance when the shaft 6 connected to the rotating shaft 60 rotates, and the principle thereof may be any. In short, when the shaft 6 rotates, a resistance force is exerted to slow down the rotation speed. However, the damper 58 used here exhibits a damper function only when the shaft 6 rotates in the direction in which the belt 8 is paid out from the belt pulley 28, and when the belt 8 rotates in the direction in which the belt 8 is wound around the belt pulley 28. It is desirable that the damper has a directionality that does not exhibit the above.

The housing 24 of the rotational operation mechanism 14 is fixed to the upper frame 2c. As shown in FIG. 6, a portion in the vicinity of one end of the shaft 6 is a bearing member 62 fixed to the inner diameter portion of the housing 24 and the housing 24. The bearing part 64 formed in the inner diameter part is rotatably fitted, and the movement in the axial direction is locked by the stopper ring 66. Coil spring insertion spaces 68 and 70 are formed in the inner diameter portion of the housing 24. As shown in FIG. 9, the coil spring insertion spaces 68 and 70 have a lever rotating coil spring 72 and a shaft fixing coil spring so that the winding directions are opposite to each other. 74 is inserted and arranged.

An inner diameter portion of the coil spring 74 is in close contact with the outer peripheral surface of the shaft 6, and one end thereof is disposed in a recessed portion formed in the housing 24 and is fixed to the housing 24 by a screw 76. The linear portion 74 a at the other end of the coil spring 74 is loosely fitted into a notch portion 78 formed in the housing 24, and its tip engages with a groove 82 formed in the arm portion 80 a of the fixing release knob 80. Yes. The fixing release knob 80 is rotatably fitted to the end portion of the shaft 6 so as not to be pulled out in the axial direction through a hole 84 formed in the fixing release knob 80.

A shaft hole 86 is formed in one of the operation members 9, the shaft hole 86 is rotatably fitted to an outer peripheral surface near one end of the shaft 6, and one side surface of the operation member 9 is The housing 24 is in contact with the side surface 24a of the housing 24 so as to be rotatable. A coil spring insertion space 88 is formed in one of the operation members 9 coaxially with the shaft hole 86 and in communication therewith. A part of the coil spring 72 is disposed in the coil spring insertion space 88. A linear portion 72 a at one end of the coil spring 72 is inserted into a groove 90 formed in the housing 24 and engages with a wall surface of the groove 90, and one end of the coil spring 72 is locked to the housing 24.

A lead-out portion 72c having a ring-shaped portion 72b at the other end of the coil spring 72 is disposed in one of the operation members 9 in a recessed portion 92 formed in communication with the coil spring insertion space portion 88, and is ring-shaped. The portion 72 b is fixed to the wall surface of the recessed portion 92 by a screw 94. A small-diameter portion 6a having a smaller diameter than the outer peripheral surface of the shaft 6 is formed in a predetermined range at a portion of the shaft 6 where the coil spring 72 is disposed.

The small diameter portion 6a causes the coil spring 72 to have a gap between the inner diameter portion of the coil spring 72 and the spring clutch portion 96 in which the inner diameter portion of the coil spring 72 is tightly wound around the outer peripheral surface of the shaft 6 by the operation of the operation member 9. And a non-spring clutch portion 98 that is loosely fitted to the shaft 6 and can be twisted in the rotational direction. The spring clutch portion 96 of the coil spring 72 is tightened around the shaft 6 when the operating member 9 swings in the clockwise direction in FIG. The member 9 is locked to the shaft 6 by the tightening force of the coil spring 72, and the operation member 9 and the shaft 6 rotate in conjunction with each other.

Further, when the operating member 9 swings in the clockwise direction, the non-spring clutch portion 98 of the coil spring 72 is twisted with the swinging rotation of the operating member 9, and the operating member 9 is swung by this torsional elasticity. It is configured to repel in the return direction opposite to the rotation direction. As shown in FIG. 11, the operation member 9 is held in a state of being raised horizontally with respect to the lower frame 2 f by the initial torsional elasticity of the coil spring 72. The coil spring 74 is wound around the shaft 6 when the shaft 6 tries to rotate in the left rotation direction in FIG. 8, and the shaft 6 is fixed to the housing 24, and the shaft 6 rotates in the right rotation direction. In some cases, a one-way clutch that allows the shaft 6 to freely rotate with respect to the housing 24 is configured.

When the unlocking knob 80 is rotated about the shaft 6 in the clockwise direction in FIG. 8, the arm 80 a swings and the one end 74 a of the coil spring 74 extends in the direction in which the inner diameter of the coil spring 74 increases. To push. Thereby, the lock | rock of the left rotation direction by the coil spring 74 of the shaft 6 is cancelled | released, and the shaft 6 will be in the state freely rotatable in the left rotation direction.
In the lifting device as described above, the procedure for moving the base member 4 up and down will be described below.

  In this lifting device, as shown in FIG. 11, since the base member 4 is suspended by the belt 8 via the guide blocks 16 and 18, the base member 4 is moved up and down by changing the length of the belt 8. Can be made. Further, due to the weight of the base member 4, the belt pulley 28 is always subjected to a force to rotate counterclockwise in FIG. 8 against the shaft 6. The belt pulley 28 is inserted and arranged in advance with the inner diameter portion of the coil spring 30 tightly attached to the outer peripheral surface of the shaft 6, so that the belt pulley 28, the shaft 6, Therefore, as long as the belt pulley 28 is not loaded with a predetermined torque or more, the shaft 6 rotates integrally with the belt pulley 28. When the base member 4 is raised by this device, the user pushes down the operation member 9 in the direction of the arrow in FIG.

By rotating the operating member 9 clockwise, the coil spring 72 is wound, the shaft 6 is fixed to the operating member 9 by the spring clutch portion 96 of the coil spring 72, and the coil sbling 74 is in a loosening direction. In conjunction with the operation member 9, it rotates in the clockwise direction in FIG. When the shaft 6 rotates to the right, the belt pulley 28 rotates in the clockwise direction in FIG. 8 in conjunction with the shaft 6 due to the frictional force between the coil spring 30 built in the belt pulley 28 and the shaft 6. When the belt pulley 28 rotates in the clockwise direction, the belt 8 is wound around the peripheral surface body 28a of the belt pulley 28, and the base member 4 is raised accordingly. When the operation member 9 is pushed down as shown by phantom lines in FIG. 8 and the operation member 9 is rotated about the shaft 6, the non-spring clutch portion 98 of the coil spring 72 is twisted by the rotation of the operation member 9, and the operation member 9 is urged in the direction of returning to the original position.

When the pressing force is released from the position where the operating member 9 is pressed down against the torsional elasticity of the coil spring 72, the operating member 9 is rotated in the left rotation direction in FIG. It returns to its original raised position and is locked to a stopper surface (not shown) of the housing 24. When the operation member 9 is raised to the original position, the rotational torque in the right rotation direction from the operation member 9 with respect to the shaft 6 is released. Therefore, the shaft 6 tries to reversely rotate in the left rotation direction in FIG. 8 due to the rotational torque from the belt pulley 28 due to the weight of the base member 4, but this reverse movement is caused by the coil spring 74 being wound around the shaft 6. When the operation member 9 is prevented from returning to its original position, the shaft 6 is fixed to the housing 24 by the locking action of the coil spring 74.

By repeating the up-and-down movement of the operation member 9, the shaft 6 intermittently rotates in the clockwise direction in FIG. 8, and the base member 4 gradually rises. When the base member 4 is moved up to the highest position defined by the lifting guides 20 and 22, it is locked to the lifting guides 20 and 22 by a stopper mechanism (not shown) provided for the guide blocks 16 and 18. The If the operating member 9 is further pushed down from the locked state by the operator and an excessive rotational torque acts on the shaft 6 in the clockwise direction in FIG. 5, slipping occurs between the shaft 6 and the coil spring 30. As a result, the shaft 6 idles with respect to the belt pulley 28, and no excessive torque is transmitted to the shaft 6 from the operation member 9.

Therefore, an unreasonable force is not applied to the rotation operation mechanism 14 side and the base member guide mechanisms 10 and 12 side for locking the base member 4 at the highest position.
When the base member 4 is lowered, the fixing release knob 80 is manually rotated in the clockwise direction as indicated by an arrow in FIG. As a result, the one end linear portion 74a of the coil spring 74 is pushed by the arm 80a in the direction of expanding the coil inner diameter of the coil spring 74, and the lock between the housing 24 and the shaft 6 by the coil spring 74 is released. .

As a result, the shaft 6 is free to rotate in the counterclockwise direction in FIG. 8, and the shaft 6 and the belt pulley 28 rotate in the counterclockwise rotation direction in FIG. Is fed out from the belt pulley 28, and the base member 4 is lowered. At this time, the rotational resistance of the damper 58 acts on the counterclockwise rotation of the shaft 6 in FIG. 8, and the base member 4 slowly descends.
In the said embodiment, although the shaft 6 was arrange | positioned in the lower surface center of the upper side frame 2c, as shown in FIG. 10, the shaft 6 is not specifically limited to this position. For example, the shaft 6 may be disposed at the left end or the right end in FIG. 10 and supported on the lower surface of the upper frame 2c.

Thus, when the shaft 6 is disposed at the left end or the right end in FIG. 10 on the lower surface of the upper frame 2c, the belt pulley 44 or the belt pulley 46 can be used as the belt pulley 28 on the shaft 6 side. The belt pulley 44 or belt pulley 46 of the first embodiment and the pulley support mechanism for supporting them can be omitted, and the number of parts can be reduced. In the above embodiment, the shaft 6, the damper 58 and the rotation operation mechanism 14 are supported on the lower surface of the upper frame 2 c, but the shaft 6, the damper 58 and the rotation operation mechanism 14 are supported on the lower surface of the base member 4. May be.

FIG. 12 shows an embodiment in which the shaft, the damper, and the rotation operation mechanism are supported on the lower surface of the base member 4. The belt 8 locked to the belt pulley 28 of the rotation operation mechanism 14 is attached to the lower surface of the upper frame 2c via attachment tools 100 and 102 through the belt paths of the left and right guide blocks 16 and 18. ing. Further, the shaft, the damper, and the rotation operation mechanism 14 are supported on the lower surface of the base member 4. Other configurations are the same as those of the first embodiment. When the operation member 9 is swung up and down, the base member 4 is raised and the fixing release knob 80 is operated to fix the shaft 6 to the fixing member side, i. When the lock on 24 is released, the base member 4 slowly descends against the resistance from the damper due to its own weight. Also in this embodiment, the shaft is not particularly limited to the configuration arranged at the center of the bottom surface of the base member 4, and may be arranged at any position other than the center of the base member 4.

2 Frame 2a Side wall frame 2b Side wall frame 2c Upper frame 2d Open surface 2e Rear wall 2f Lower frame 4 Base member 6 Shaft 6
8 Belt 10 Base member guide mechanism 12 Base member guide mechanism 14 Rotation operation mechanism 16 Guide block 18 Guide block 20 Lift guide portion 22 Lift guide portion 24 Housing 26 Bracket 28 Belt pulley 28a Peripheral body 28b Disc body 28c Disc body 30 Coil spring 32 Stopper ring 34 Stopper ring 36 Groove 38 Pin 40 Recess 42 Groove 44 Belt pulley 46 Belt pulley 48 Pulley holder 50 Pulley holder 58 Damper 60 Rotating shaft 62 Bearing member 64 Bearing portion 66 Stopper ring 68 Coil spring insertion space portion 72 Coil spring insertion space portion 72 Coil spring 74 Coil spring 76 Screw 78 Notch 80 Unlocking knob 80a Arm portion 82 Groove 84 Hole 86 Shaft hole 88 Coil spring insertion space portion 90 Groove 92 Recess portion 9 Screw 96 spring clutch unit 98 non-spring clutch portion 100 fitting 102 fitting

Claims (1)

A shaft (6), a coil spring (72) fitted and arranged on the outer peripheral surface of the shaft (6), and a drive member (9) rotatable with respect to the shaft (6), The coil spring (9) is moved to the drive member (9) so that the drive force of the drive member (9) in the forward and reverse directions with respect to the shaft (6) is transmitted to one end of the coil spring (72). 72) by connecting one end of the drive side member (9) and changing the direction of the drive force of the drive side member (9) with respect to the shaft (6), the drive side member (9) is moved through the coil spring (72). A rotational operation mechanism that can be fixed to the shaft (6) or can be released from the fixed state, and has a driving force in the locking direction from the driving member (9) at one end of the coil spring (72). This drive One end of the coil spring (72) is driven by force, the coil spring (72) is wound around the outer peripheral surface of the shaft (6), and the driving side member ( 9) and the and the shaft (6) is fixed, as the driving force of the driving-side member (9) is transmitted to the shaft (6) via said end portion of the coil spring (72), wherein The connecting portion between the drive side member (9) and one end of the coil spring (72) is formed by pulling out one end of the coil spring (72) to be a lead portion (72c), and the tip of the lead portion (72c) is rounding annular portion (72b) formed by inserting a screw (94) in該輪shaped portion (72b), and fixed the annular portion (72b) to a member (9) of the drive side by a screw (94) Rotary operation mechanism using a coil spring, characterized in that a formed.

Images