GrabCAD 模型信息
NASA CHALLENGE - HANDRAIL CLAMP ASSEMBLY · 模型 258578
HANDRAIL CLAMP ASSEMBLY (HCA) DESCRIPTION In the design of the handrail clamp, the following points were taken into consideration in their order of importance. 1. Safety a. Sharp edge human factors were carefully adhered to as per CHAMP requirements with all edges rounded to appropriate radii b. Pinch areas between moving parts were avoided wherever possible, otherwise anti-pinch shields were built-in. c. A rigid connection between the clamp and rail was vital as described under point 2 below. 2. Function & strength a. It was deemed of paramount importance that the assembly has a positive grip on the rail. This point is interleaved with Safety as sudden slippage or opening of the bracket is considered unsafe for the astronaut. This would be quite easily achieved with a 3 or 4 piece assembly by using cams, as is the case with the ISS current clamp assembly for example. This design has two parts (see point 3) and this was achieved by a design with special arrangement of the clamp elements as described under OPERATION below. The object was to achieve rigidity of the clamp-rail connection at least to the level of the rail interface strength achievable with the ABS printed part. 3. Mass and form It was decided to limit the assembly to two printed parts for simplicity of assembly for minimum astronaut time. The shape envelope of 1” around the rail has been adhered to. The volume of the HCA assembly is 5.42 in³, and the weight is 0.2 lb. 4. Both parts comply with the maximum print size of 2.36” x 2.36” x 4.72”. OPERATION The HCA is shown in Figure 1 with depicted names of various parts. Figure 1(a) is an isometric view while Figure 1(b) shows the assembly end-view as positioned on the rail in the locked position. The part with the seat track interface is named ‘L-Track, while the bottom part is named ‘Clamp’. After the two parts have been printed they are assembled as per Figure 2(a). The Clamp is hand-pressed into the L-Track until it snaps into position as per Figure 3(a). This is only done once, thereafter the assembly may be manipulated as an integral unit. This obviates mislaying or loosing parts. The assembled unit may now be placed over the handrail as shown in Figure 2(c) and positioned axially on the rail as required – Figure 2(d). Attaching the HCA assembly to the rail The clamp is closed by pushing the Clamp on the Lock Serrations into the locked position, see Figure 1(b). In the closing of the clamp around the rail, there are several clamping...
- 格式
- Rendering、SOLIDWORKS、STL、Other、STEP / IGES
- 分类
- 3D printing、Aerospace、Tools
- 标签
- handrailclamp
- 数据更新
- 2026-10-30T06:24:39Z