Flexible member

Patent metadata

Field	Value
Publication number	US-12038060-B2
Application number	US-202017601927-A
Country	US
Kind code	B2
Filing date	Apr 13, 2020
Priority date	Apr 11, 2019
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

The present invention provides a flexible member having excellent load resistance and flexibility while achieving a reduction in size. This flexible member is provided with: a main body part which includes multiple wave washers that are stacked in an axial direction and are joined to one another by multiple joint parts, and which is capable of bending relative to the axial direction by elastic deformation of the wave washers; and easily deformable parts formed between the joint parts that are adjacent to one another in the circumferential direction in each wave washer.

First claim

The invention claimed is:

1. A flexible member comprising:
a main body part that has a plurality of wave washers stacked in an axial direction and joined to each other by a plurality of joint parts, and the main body part is able to be bent with respect to the axial direction due to elastic deformation of the wave washers; and
easily deformable parts that are formed between the joint parts adjacent to each other in a circumferential direction in each of the wave washers, and the easily deformable parts are more readily deformable than other portions in the wave washers;
wherein each of the plurality of joint parts includes: welded parts in linear shape, being extended from an inner circumferential side toward an outer circumferential side of each of the plurality of wave washers;
wherein each of the joint parts includes a pair of the welded parts, and
wherein the pair of the welded parts gradually separates from each other in the circumferential direction from the inner circumferential side toward the outer circumferential side in each of the plurality of wave washers;
wherein the pair of the welded parts has a V-shape in which the welded parts overlap each other on the inner circumferential side in each of the plurality of wave washers;
wherein an opening angle between the pair of the welded parts is within a range of 15 degrees to 30 degrees.

2. The flexible member according to claim 1 ,
wherein the easily deformable parts include: portions of each of the plurality of wave washers having a relatively small dimension in a radial direction of each of the plurality of wave washers.

3. The flexible member according to claim 2 ,
wherein the easily deformable parts are divided by recessed parts formed in the radial direction in an inner circumference of each of the plurality of wave washers.

4. The flexible member according to claim 1 ,
wherein the easily deformable parts include: portions of each of the plurality of wave washers having a relatively small plate thickness smaller than that of each of the plurality of joint parts.

5. The flexible member according to claim 1 ,
wherein each of the plurality of wave washers includes a plurality of mountain parts and valley parts between the mountain parts in the circumferential direction, mountain parts and valley parts of adjacent wave washers abut each other, and abutment portions of the mountain parts and the valley parts are joined to each other by the joint parts.

Assignees

• Nhk Spring Co Ltd

Inventors

• Kawai Yosuke
• Kurokawa Shimpei
• Hayakawa Yuki

Classifications

• F16F2226/048

  Welding · CPC title

• B25J18/06

  flexible · CPC title

• A61B34/30

  Surgical robots · CPC title

• F16F1/328

  with undulations, e.g. wavy springs · CPC title

• B25J9/0015

  Flexure members, i.e. parts of manipulators having a narrowed section allowing articulation by flexion · CPC title