以上の本発明は次の請求項２から６のように具体化されることがより好ましい。
（１）前記頭部の突起又は／及び前記係止脚の突起は、先端面が前記被取付板の曲面部の曲率半径より小さな断面略円弧状に形成されている構成である（請求項２）。
（２）前記係止脚の突起と前記頭部の突起とは互いに対向していると共に、両突起のうち一方の突起が２以上形成されている構成である（請求項３）。
The present invention as described above is more preferably embodied as in the following claims 2 to 6.
(1) the head of the projections and / or protrusions of the engagement Tomeashi has a configuration in which the distal end surface is the formed on the curved surface of curvature radius by Ri small cross-section substantially arc-shaped of the mounting plate ( Claim 2).
(2) The protrusion of the locking leg and the protrusion of the head are opposed to each other, and one or more of the protrusions are formed.
請求項２の発明では、頭部の突起先端面又は／及び係止脚の突起先端面が被取付板の曲面部の曲率半径より小さな断面略円弧状に形成されているため、従来のごとく平坦面同士の間に挟持する構造に比べ曲面部の曲率に馴染み易くなり、それに伴って固定力も大きくできる。
In the invention of claim 2, since the projecting tip surface or / and the projecting tip face of the locking leg of the head is formed in a curved portion the radius of curvature by Ri small substantially arcuate cross section of the mounting plate, as in the prior art Compared to the structure sandwiched between flat surfaces, it becomes easier to become familiar with the curvature of the curved surface portion, and accordingly the fixing force can be increased.
突起１４ａは、突起１５と若干の隙間を保って対向しており、先端面が被取付板７の曲面部７ａや７ｂの曲率半径より小さなＲ形ないしは断面略円弧状に形成されている。このような形状は、係止脚３が取付孔８に挿入された状態で、両側の突起１４ａの円弧面を介して被取付板７の裏面側に当接、つまり点接触又は線接触することで曲面部７ａや７ｂの曲率が異なっても安定した当接状態を保つ。この点は突起１５と同様である。
Projection 14a is opposed to maintaining a slight gap between the projections 15, the distal end surface is formed in a small R-shaped or substantially arcuate cross section Ri by the radius of curvature of the curved surface portion 7a and 7b of the mounting plate 7. In such a shape, in a state where the locking leg 3 is inserted into the mounting hole 8, it comes into contact with the back surface side of the mounted plate 7 through the arc surfaces of the protrusions 14 a on both sides, that is, point contact or line contact. Thus, a stable contact state is maintained even if the curvature of the curved surface portions 7a and 7b is different. This is the same as the protrusion 15.
（ウ）付言すると、前者の挟持力は、突起１５及び突起１４ａが曲面部７ａや７ｂの曲率に馴染み易いことから、取付孔８が曲面部７ａや７ｂに設けられていても、比較的小さな突起１４ａ，１５同士の間に被取付板７を挟持するため、従来よりも数段安定した挟持態様となり、それに伴って設計通りの固定力を確実に付与できる。また、この構造では、頭部２側の突起５の先端面又は／及び係止脚３に設けられる係止片４側の突起１４ａの先端面ないしは当接面が曲面部７ａや７ｂの曲率半径より小さな断面略円弧状に形成されているため、従来のごとく平坦面同士の間に挟持する構造に比べ曲面部の曲率に馴染み易くなり、それに伴って固定力も向上できる。
(C) In other words, the clamping force of the former is relatively small even if the mounting hole 8 is provided in the curved surface portions 7a and 7b because the projection 15 and the projection 14a are easily adapted to the curvature of the curved surface portions 7a and 7b. Since the mounted plate 7 is clamped between the protrusions 14a, 15, the clamping mode is more stable than the conventional one, and accordingly, a fixing force as designed can be reliably applied. Further, in this structure, the distal end surface of the protrusion 5 on the head 2 side and / or the distal end surface or the contact surface of the protrusion 14a on the locking piece 4 side provided on the locking leg 3 is the radius of curvature of the curved surface portions 7a and 7b. because it is formed in good Ri small substantially arcuate cross section, familiar easily to the curvature of the curved portion than in the structure sandwiched between the flat faces as in the prior art, it can also be improved fixing force accordingly.