JPH06186355A - Structure of rotary bezel - Google Patents

Abstract

PURPOSE:To obtain a structure of rotary bezel in which high reverse rotation strength can be ensured while sustaining an appropriate forward rotation torque. CONSTITUTION:A rotary bezel 2 having lower inside wall provided with irregularities 11 is fixed rotatably to the upper peripheral side of a watch case 1. A resilient ring member 7 having engaging protrusions 10 is fixed to the inside of the watch case 1. The engaging protrusions 10 of the resilient member 7 engage with the irregularities 11 of the rotary bezel 2. The engaging protrusions 10 and the irregularities 11 are inclining at a predetermined angle alpha.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rotary bezel which prevents reverse rotation of a rotary bezel in a wristwatch.

[0002]

2. Description of the Related Art Conventionally, a reverse rotation preventing structure of a rotating bezel is
The watch case has a rotating bezel made of resin, which is rotatably attached to the watch case and is formed with a concavo-convex portion in the radial direction, and engaging projections which are provided at a plurality of equal intervals and engage with the concavo-convex portion. And an elastic member made of resin disposed in the. When the load is applied in the reverse rotation direction, the reverse rotation prevention structure prevents reverse rotation by the concave and convex portions of the rotating bezel and the engaging projections of the elastic member engaging with each other by surface contact. Also,
When a load in the forward rotation direction is applied to the rotating bezel, the elastic member elastically deforms in the radial direction and rotates with a click feeling.

[0003]

In order to reliably prevent such a reverse rotation of the rotary bezel, it is necessary to set a large contact area (fogging amount) between the uneven portion of the rotary bezel and the engaging projection of the elastic member. However, with this structure, at the same time, the rotational torque in the forward rotation direction also increases, which makes it difficult to rotate.

Therefore, the present invention was developed in view of the above problems in the prior art, and provides a structure of a rotating bezel capable of reliably preventing a reverse rotation direction while maintaining an appropriate forward rotation torque. The purpose is to do.

[0005]

According to the present invention, there is provided a rotating bezel rotatably mounted on a watch case in one direction and an engaging projection formed on the watch case so that the rotating bezel is located at a mounting portion of the rotating bezel. Engagement formed on the rotating bezel so as to be located at an opposing portion with the elastic member arranged and having a shape inclined at a predetermined angle in a direction opposite to the rotating direction of the rotating bezel and engaging with the engaging protrusion. It is characterized by having teeth and teeth.

[0006]

1 to 5 show the present invention, FIG. 1 is a plan view with a part omitted, FIG. 2 is a half cut sectional view, FIG. 3 is a plan view of an elastic member, FIG. 4 is a side view of the same, and FIG. 5 is an enlarged plan view of an essential part.
Reference numeral 1 is a watch case, and a rotating bezel 2 is attached to the upper outer peripheral side of the watch case 1. The watch case 1 accommodates a watch module (not shown) therein, and a watch glass 3 is fitted on the upper surface of the watch case 1 via a glass packing 4, and a back cover 5 is attached to the lower surface thereof. In FIG. 2, 6 is a back cover 5 and a watch case 1.
It is a seal ring for maintaining airtightness with. A ring-shaped elastic member 7 is attached to the upper outer peripheral bracket upper surface of the timepiece case 1.

The elastic member 7 has a wide fixing portion 7a and a narrow elastic portion 7b integrally formed between the fixing portions 7a. The fixing portion 7a is used for fixing the position of the timepiece case 1. The three pins 8 are formed at equal intervals (every 120 °), and the elastic members 7 are fixed to the timepiece case 1 by fitting the pins 8 into the holes 9 formed in the timepiece case 1 ( See FIG. 2). On the other hand, the elastic portion 7b is formed to be narrower than the fixed portion 7a so as to have elasticity, and thus the elastic portion 7b can be elastically deformed in the radial direction. Further, the elastic portion 7b is formed with an engagement protrusion 10 protruding outward.

The engaging projection 10 is an uneven portion 1 of the rotating bezel 2.
1 to allow the bezel 2 to rotate in one direction, while preventing the bezel 2 from rotating in the other direction. The concavo-convex portion 11 of the rotating bezel 2 and the engaging surface 10a of the engaging protrusion 10 that engages with the concavo-convex portion are inclined at a predetermined angle α with respect to the radial direction in the direction opposite to the rotating direction of the rotating bezel 2. Further, the base of the engagement surface 10a has an R shape in order to increase the strength of the engagement protrusion 10. In this case, the predetermined angle α of the engagement surface 10a is recognized from the viewpoint of reliably preventing the reverse rotation of the rotating bezel 2, and is set to 10 to 20 °, more preferably about 15 °.

The rotary bezel 2 is formed in a ring shape as a whole, and is attached to the upper outer peripheral side of the timepiece case 1. The lower part of the rotating bezel 2 slides on the watch case 1 to rotate with respect to the watch case 1. As shown in FIG. 2, an uneven portion 11 is formed on the inner wall of the lower portion of the rotating bezel 2. The concavo-convex portion 11 is formed by radially protruding in a state where the concave portion and the convex portion are alternately continuous, and the engaging protrusion 10 of the elastic member 7 engages with the convex portion of the concavo-convex portion 11. The concavo-convex portion 11 of the rotating bezel 2 and the engaging protrusion 10 of the elastic member 7 are formed in ratchet teeth, so that the rotating bezel 2 moves in the forward direction (X in FIG. 1).
(Direction), only rotation is performed, and rotation in the opposite direction is locked. In FIG. 2, reference numeral 12 is an O-ring inserted between the upper side surface of the rotating bezel 2 and the upper side surface of the watch case 1.

In the above structure, the engaging projection 10 of the elastic member 7 fixed to the watch case 1 and the concave and convex portion 11 of the rotary bezel 2 are engaged in the radial direction, and in this state, the rotary bezel 2 is moved in the forward direction. When rotated to the
Since 1 elastically deforms the engagement protrusion 10 in the radial direction, the rotating bezel 2 can be rotated with a click feeling. On the other hand, when the rotating bezel 2 is operated with a rotational force in the opposite direction, the engaging surface 10a of the engaging projection 10 abuts on the concave-convex portion 11, so that the rotating in the opposite direction is prevented. During the rotation operation in the reverse direction, the engagement surface 10a of the engagement protrusion 10 has a shape inclined in the direction opposite to the forward rotation of the rotating bezel 2, so that the convex and concave portions 11 of the rotating bezel 2 are firmly joined. Engage with. Therefore, the reverse rotation can be reliably prevented.

The present invention can be variously modified without being limited to the above embodiment. For example, the uneven portion 11 is formed on the outer wall of the rotating bezel 2, and the elastic member 7 is engaged with the uneven portion 11. The mating protrusion 10 may be engaged from the outside. Further, the rotating bezel 2 and the elastic member 7 can be formed of various materials such as metal and synthetic resin. Furthermore, the number of pins 8 formed on the elastic member 7 is not limited to three, and for example, six (8 at every 60 °) or more may be formed at equal intervals. Further, the present invention can be similarly applied to table clocks other than wrist watches.

[0012]

As described above, according to the structure of the rotating bezel of the present invention, the reverse rotation strength at the engaging portion between the rotating bezel and the elastic member is increased, so that an appropriate forward rotation torque can be maintained. However, reverse rotation can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a partially omitted plan view showing an embodiment of the present invention.

FIG. 2 is a half-cut sectional view showing an embodiment of the present invention.

FIG. 3 is a plan view of an elastic member showing an embodiment of the present invention.

FIG. 4 is a side view of an elastic member showing an embodiment of the present invention.

FIG. 5 is an enlarged sectional view of an essential part showing an embodiment of the present invention.

[Explanation of symbols]

 1 Watch case 2 Rotating bezel 7 Elastic member 8 Pin 10 Engagement protrusion 11 Uneven part

Claims (1)

[Claims] 1. A rotary bezel rotatably attached to a watch case in one direction, an elastic member formed on the watch case so as to be positioned at an attachment portion of the rotary bezel and having an engaging projection, An engaging tooth formed on the rotating bezel so as to be located at a facing portion with which the engaging protrusion engages, the engaging tooth having a shape inclined at a predetermined angle in a direction opposite to the rotating direction of the rotating bezel. And the structure of the rotating bezel.