A push-up suspension door commonly used as a garage door consists of a plurality of hinged door assemblies. Usually, the suspended doors are supported on a pair of L-shaped tracks, which allow the garage door to move up from roughly vertically closed to horizontally open. In order to complete such movement, a plurality of roller supports are installed on the side edge close to the garage door. There is a roller on each roller support, which is engaged on a fixed L-shaped track and can roll on it. Generally, the roller support also includes a pair of opposite butting hinge pieces that hinge the adjacent door segments together. There is a metal hinge connecting pipe for inserting the mandrel of the roller on the butt hinge.

通常的滾輪支撐件上的滾輪大都是由金屬件構成，這樣，當門移動的時候，由于滾輪和L形軌道間是金屬與金屬的接觸，將產生很大的噪音。而且，為了降低材料成本，通常這樣的滾輪支撐件采用的是普通鋼。雖然滾輪支撐件通常安裝在懸掛門內側，但仍然還有許多構件是暴露在外的，因而生銹和其它一些腐蝕問題也不可避免。這樣的腐蝕將會使門所產生的噪音更大，而且會使滾輪支撐件損壞。

Generally, the roller on the roller support part is mainly composed of metal parts. In this way, when the door moves, the metal to metal contact between the roller and the L-shaped track will produce a lot of noise. Moreover, in order to reduce the material cost, the roller support is usually made of ordinary steel. Although the roller support is usually installed inside the suspension door, there are still many components exposed, so rust and other corrosion problems are inevitable. Such corrosion will make the door produce more noise and damage the roller support.

針對上述問題，我公司對滾輪支撐件做了改進，在通常的滾輪支撐件的金屬芯軸上可旋轉地安裝上塑料滾輪。這種滾輪支撐件所產生的噪音比帶有金屬滾輪的滾輪支撐件所產生的噪音要小。另外，塑料滾輪還不會腐蝕。但是，這樣的滾輪支撐件要比全鋼制成的滾輪支撐件昂貴，在成本上不具競爭力。

In view of the above problems, our company has improved the roller support, and the plastic roller can be installed on the metal mandrel of the roller support part. The noise generated by the roller support is smaller than that generated by the roller support with metal roller. In addition, the plastic roller will not corrode. However, this kind of roller support is more expensive than the roller support made of all steel, so it is not competitive in cost.

改進優勢是車庫門上的滾輪組件，該滾輪組件包括一個芯軸和一個由聚合材料制成的滾輪。芯軸包括一個軸桿部分和一個座圈部分。其中軸桿部分安裝在車庫門上，并使座圈部分伸出門側邊之外一段距離。一個從滾輪內表面沿徑向向內凸出的凸肩部分，它被安裝在座圈部分的一個環行凹槽內。滾輪的外端部咬合在位于通道側邊的L形軌道上。

The improvement advantage is the roller assembly on the garage door, which includes a mandrel and a roller made of polymer material. The mandrel includes a shaft rod part and a seat ring part. The shaft rod part is installed on the garage door, and the seat ring part extends a distance beyond the side of the door. A shoulder part protruding radially from the inner surface of the roller is installed in a circular groove of the seat ring part. The outer end of the roller is engaged on the L-shaped track at the side of the channel.

芯軸和滾輪都是單個整體構件，芯軸是由玻璃纖維加強的尼龍制成的，滾輪則由具有高沖擊性能的尼龍制成。座圈部分上有一個輪轂遠端部分和一個遠端坡面，一個凹槽將它們與一個輪轂近端部分及一個近端坡面相隔開。遠端和近端坡面分別從遠端和近端輪轂外表面向凹槽外表面方向延伸。滾輪包括遠端和近端坡面，它們分別與座圈部分的遠端和近端坡面相對。

Both the mandrel and the roller are single integral components. The mandrel is made of glass fiber reinforced nylon, while the roller is made of nylon with high impact performance. On the seat ring part, there is a distal part of the hub and a distal slope surface, and a groove separates them from a proximal part of the hub and a proximal slope surface. The far end and near end slope extend from the outer surface of the far end and the near end hub to the outer surface of the groove respectively. The roller comprises a far end slope surface and a proximal slope surface, which are opposite to the far end slope surface and the proximal slope surface of the seat ring part respectively.