JP2564277Y2 - Retaining mechanism of rotation transmission device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining mechanism for a rotation transmitting device.

[0002]

The rotary shaft for driving the Related Art blind lift cord winder, rotational force to the output shaft of the operation gear mechanism that is operated by the operation code (which is a reduction gear)
There is fitted so as to be transmitted, Ru is fixed at a predetermined axial position by a retaining mechanism Tei. As a conventional retaining mechanism, there is a rubber retaining ring,
This rubber retaining ring is lifted up and down with a cord winding device and
Apply elastic force to the rotating shaft so that it contacts the side of the operating gear mechanism.
Therefore, by tight fitting, the rotation axis
To prevent them from moving. Also, as another example,
Made of metal or hard resin instead of rubber retaining ring
Some use retaining rings for
Each retaining ring has an opening formed in the radial direction.
At the end of the opening is a circumferential screw hole that spans the opening
Is provided. These retaining rings are
An elevating cord winding device and operation gear
Is positioned so that it contacts the side of the
The retaining ring itself is generated by screwing the screw
To rotate the rotating shaft by the elastic force
Fixed to the shaft. Furthermore, a screw hole is formed at the end of the output shaft.
Screw into this screw hole, and
The rotating shaft is pinched and fixed by the output shaft.
There are some.

[0003]

However, the above-mentioned conventional retaining mechanism has the following problems. Those fitting the rubber stopper ring, it is necessary to align the two rubber retaining ring fit tightly to the rotating shaft, the Ru very troublesome der working mating by frictional resistance of the rubber. In the case of using metal or hard resin retaining rings , these retaining rings
The rotating shaft is pinched by elastic force to secure it to the rotating shaft.
The play between the retaining ring and the rotating shaft.
The rotation force, impact, and vibration of the rotating shaft are
Acting on the screw and screw, the screw is loosened and
There is a problem that the rotating shaft cannot be pinched by the rotating shaft and the rotating shaft comes off. Also, screw holes on the output shaft
Is formed and screwed, the rotational force of the output shaft,
Since the shot and vibration act directly on the screw, the screw loosens and rotates
There is a problem that the shaft comes off. The present invention is intended to solve such a problem.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem by preventing a rotational force from acting on a screw of a retaining mechanism. That is, the retaining mechanism of the rotation transmitting device of the present invention is configured such that the first shaft having the non-circular cross section and the axial hole having the non-circular cross section of the second shaft transmit the rotational force but are relatively movable in the axial direction. The first shaft and the second shaft are fitted together and fixed in the axial direction at a desired relative axial position by a stopper mechanism. The retaining mechanism has a retaining member and a screw, and the retaining member has a space portion that penetrates in the axial direction and a screw hole that reaches the space portion from the outer periphery. The portion has a shape that can be fixed by pinching a first shaft between a tip end of a screw screwed into a screw hole and a wall that forms a space, and a second shaft has a retaining member It has a shape that can fit into the space and is located at the position corresponding to the screw hole of the retaining member. A retaining member coupling portion having a through hole with a large diameter is provided, and a screw screwed into the screw hole reaches a position in contact with the first shaft through the through hole of the retaining member coupling portion. The play between the through-hole and the play between the retaining member coupling portion and the space portion is set to be larger than the play for fitting the axial hole of the first shaft and the second shaft. Features.

[0005]

The transmission of the rotational force between the first shaft and the second shaft is performed at a fitting portion between the two shafts. The retaining is performed by a retaining member fixed to the first shaft with a screw. Play of the fitting portion between the axial holes of the first shaft and the second shaft
Is the play between the screw and the through hole, and the retaining member connection
Is smaller than the play between the space parts and retaining member, it is Do <br/> physician rotational force acts on the threads of the retaining member. For this reason, loosening of the screw is prevented.

[0006]

FIG. 1 is an overall view of a blind having a retaining mechanism according to the present invention. A plurality of slats 10 are arranged at predetermined intervals in the vertical direction.
The headbox 12 is arranged at the upper end of the row, and the bottom rail 14 is arranged at the lower end. Head box 1
A ladder cord 16 is provided between the bottom rail 2 and the bottom rail 14 to support each slat 10. The lifting cord 18, one end of which is attached to the bottom rail 14, is wound on a lifting cord winding device 20 in the head box 12 through a lifting cord insertion hole (not shown) provided in the slat 10. It is connected as possible. The slat 10 is raised and lowered by winding and unwinding the lifting cord 18. A rotating shaft 22 (first shaft) capable of rotating the lifting cord winding device 20 is connected to the lifting cord winding device 20. The rotation of the rotation shaft 22 is
The operation is performed by the operation cord 26 via the operation gear mechanism 24 provided at the end.

FIG. 2 is an exploded perspective view of the operation gear mechanism 24. As shown in this figure, the operating gear mechanism 24 includes a casing 25, a pulley 28, a transmission projection 30, an output shaft 32 (second shaft), a cover 34, and a retaining member 36.
And a screw 38. The pulley 28 is provided at one end in the casing 25, and rotates by pulling the operation cord 26 wound around the circumference of the pulley 28 downward. The rotation of the pulley 28 is reduced by a planetary gear unit (not shown) in the casing 25 and output to the transmission protrusion 30. The output shaft 32 is
0 and a circular wall 42 formed coaxially with one end of the shaft 40. The output shaft 32 has a shaft 4
A connection hole 46 (axial hole) is formed through the center of the O and the wall 42. The connection hole 46 has a square cross section of a size that fits into the rotation shaft 22 having a square cross section. The distal end portion 48 (retaining member connecting portion) of the shaft portion 40 has a substantially U-shaped cross section from which about half of the circumferential direction is removed.
A flat seating surface 51 is provided on the outer periphery of the distal end 48 opposite to the removed portion. A through hole 52 that extends from the seat surface 51 to the connection hole 46 is provided. A projection 44 projecting perpendicular to the wall 42 is formed on a half of the circumference of the wall 42. The output shaft 32 is disposed in the casing 25 such that the transmission projection 30 and the projection 44 are located on the same circumference, and the transmission projection 30 rotates and comes into contact with the projection 44 to rotate integrally. As a result, torque is transmitted between the two. The cover 34 has a space 54 through which the shaft 40 of the output shaft 32 can be inserted. The retaining member 36 is provided with a space 56 in the axial direction in which the distal end 48 of the output shaft 32 fits. The retaining member 36 and the shaft portion 40 are connected by the space portion 56 fitting into the distal end portion 48. The retaining member 36 has a screw hole 58 at a position corresponding to the through hole 52 of the distal end portion 48 to which the retaining member 36 is fitted.

FIG. 3 shows a view of the assembled operation gear mechanism 24, and FIG. 4 shows a view of the operation gear mechanism 24 incorporated in the head box 12. As shown in FIG. 4, the operation gear mechanism 24 is disposed in the head box 12 so that the axial direction of the operation gear mechanism 24 is in the longitudinal direction of the head box 12. Cover 34, by inserting the shaft portion 40 of the output shaft 32 to the space portion 54, the side on which the pulley 28 of the casing 25 is provided attached to the opposite end, the casing cover 34 25 inside faces and out
The protruding portion 44 of the force shaft 32 is in contact. This allows
The casing 25 is disposed only in the casing 25.
Output shaft whose radial position was fixed only by
32 is fixed by the cover 34 in the axial direction.
Because, the output shaft 32 by the vibration movement to the left in FIG. 3
It is possible to prevent. The rotation shaft 22 fits into and penetrates the connection hole 46 of the output shaft 32. Tip 4 of shaft 40
8 is fitted with a space 56 of the retaining member 36. The screw 38 is screwed into the screw hole 58 of the retaining member 36. The screw 38 is screwed through the through hole 52 of the output shaft 32 until it comes into contact with the rotating shaft 22. Thus, the rotation shaft 22 is held by the retaining member 36. The space 56 of the retaining member 36 and the output shaft 32
Play between the screw 38 and the through hole 52 is caused by the rotation shaft 22 and the output shaft 3 respectively.
The play of the engagement with the second connection hole 46 is larger than the play.

Next, the operation of this embodiment will be described. Pulling one of the operation cords 26 downward causes the pulley 28 to rotate. The rotation of the pulley 28 is reduced by the planetary gear device and transmitted to the transmission protrusion 30. The output shaft 32 does not rotate until the transmission protrusion 30 rotates by a predetermined angle, but when the transmission protrusion 30 rotates by a predetermined angle and comes into contact with the protrusion 44 of the output shaft 32, the transmission protrusion 30 and the output shaft 32 rotate integrally. Begin to. When the output shaft 32 rotates, the rotation shaft 2
2 and the retaining member 36 also rotate integrally with the output shaft 32. At this time, the rotational force is transmitted via a fitting portion between the connection hole 46 having the square cross section of the output shaft 32 and the rotary shaft 22 having the square cross section. On the other hand, the retaining of the rotating shaft 22 is performed by the retaining member 36 and the screw 38. That is, the rotating shaft 22 is connected to the tip of the screw 38 and the retaining member 36.
3, the rotating shaft 22 and the retaining member 36 are integrated with each other. Since the screw 38 penetrates the through hole 52 of the distal end portion 48 of the output shaft 32, the retaining member 36
It does not deviate from 2. Therefore, the rotation shaft 22 does not move relative to the output shaft 32 in the axial direction. It should be noted that the space 56 of the retaining member 36 and the leading end 48 of the output shaft 32 play with each other, and the screw 38 and the through hole 52
Between the rotary shaft 22 and the output shaft 32.
It's bigger than the fit play. Therefore,
No rotational force is transmitted between the rotation shaft 22 and the output shaft 32 via the retaining member 36 and the screw 38. For this reason, there is no rotational force or impact or vibration associated with the start or stop of rotation acting on the screw 38, and the screw 38 does not loosen due to these. Thereby, the rotation shaft 22 is reliably prevented from coming off.

[0010]

According to the present invention, the retaining member is fitted with the tip of the output shaft, and the tip of the screw is attached to the output shaft.
Until it comes into contact with the rotating shaft through the through hole
Can be fixed to the output shaft simply by screwing the screw into the screw hole.
Therefore, the work of attaching the retaining member is easy. Ma
Also, fit the space of the retaining member with the tip of the output shaft.
The play between the screw and the through hole is
It is larger than the play of fitting with the connection hole of the output shaft
Therefore, the retaining member is fixed to the output shaft via a screw.
However, since the rotation of the output shaft is directly transmitted to the rotation shaft without passing through the screw , the rotation of the output shaft and the rotation shaft
Forces, shocks, vibrations, etc. directly act on retaining members and screws
Not Rukoto, loosening of the screw is prevented, securely retaining is performed.

[Brief description of the drawings]

FIG. 1 is an overall view of a blind having an operation gear mechanism provided with a retaining mechanism of the present invention.

FIG. 2 is an exploded perspective view of an operation gear mechanism.

FIG. 3 is a view of an assembled operation gear mechanism.

FIG. 4 is a view of an operation gear mechanism incorporated in the head box.

[Explanation of symbols]

 22 Rotary shaft (first shaft) 32 Output shaft (second shaft) 36 Retaining member 38 Screw 40 Shaft 46 Connecting hole (axial hole) 48 Tip (retaining member connecting portion) 51 Seat 52 Through hole 56 Space 58 Screw hole

Claims (2)

(57) [Scope of request for utility model registration] A first shaft having a non-circular cross section and an axial hole having a non-circular cross section of a second shaft are fitted so as to transmit rotational force but relatively move in the axial direction. The above-mentioned retaining mechanism of the rotation transmitting device between the first axis and the second axis, wherein the two axes are axially fixed at a desired relative axial position by a retaining mechanism. It has a member and a screw,
The retaining member has a space part penetrating in the axial direction and a screw hole reaching the space part from the outer periphery, and the space part is a wall forming a space between the tip part of the screw screwed into the screw hole and the space part. The first shaft has a shape that can be fixed by being sandwiched between the second shaft and the second shaft. The second shaft has a shape that can fit in the space of the retaining member and corresponds to the screw hole of the retaining member. A retaining member coupling portion having a through hole with a larger diameter is provided at a position where the screw is screwed into the screw hole to reach a position where it comes into contact with the first shaft through the through hole of the retaining member coupling portion. The play between the screw and the through hole, and the play between the retaining member coupling portion and the space,
A retaining mechanism for a rotation transmission device, wherein the clearance is set to be larger than a play of engagement between an axial hole of a first shaft and an axial hole of a second shaft. 2. The rotation transmission device according to claim 1, wherein the first shaft is a rotation shaft for driving a blind lifting / lowering cord winding device, and the second shaft is an output shaft of an operation gear mechanism driven by the operation code. Retaining mechanism.