Snap connectors

Figure 4.23. Snap connector. [Adapted Ames, T, US Patent 5,642,592, Jul. 1,1997.]...

Figure 4.23 shows a snap connector (400) which can be mounted on the wide vertical side of a wood joist to facilitate securement of the vertically oriented plastic extrusions. The snap connector (400), which is made of an extruded polyvinyl chloride material, includes an elongated base (401) having a pair of opposed elongated end flanges (402) and (404). Each flange (402,404) includes a first section (406,408) which extends perpendicularly to the base (402) and a second section (410,412) which in turn extends perpendicularly from the first section (406,408). Each second section (410,412) includes a pilot surface (414,416). The flanges (402,404) each define a recessed space (418,419). The snap connector also... 

Snap connectors are also widely used since snaps are already often use in clothing assembly. In this case, the conductive yam is sewn on one side of the snap (Buechley and Eisenberg, 2009), as shown in Rg. 23.2, while the other side is connected to the circuit board. 

Applications Clips, snap connectors, retainers, machine parts. ... 

Fig. 5 GPCR regulation of exocytosis downstream of Ca2+-entry. (a) Sequence of steps leading from recruitment to maturation of synaptic vesicles from a reserve pool (RP) to a readily-releasable pool (RRP) displaying slow (asynchronous) and fast (synchronous highly Ca2+-sensitive pool, HCSP synaptotagmin 1 (SYT 1) supported) components, (b) Protein-protein interactions of SNARES (SYX, syntaxin SYB, synaptobrevin and SNAP-2s-7S complex) and major putative regulatory proteins. Phosphoproteins are shown in shaded boxes (phosphorylation sites for PKA and PKC are indicated where known) with phosphorylation-dependent interactions depicted by arrows (increase indicated by filled arrows decrease indicated by open arrows). Circle-end connectors indicate a phosphorylation-independent or as yet unspecified interaction. Potential effects of interactions at various points of the sequence in A are discussed in the text.

Fig. 7.5.17 Sensor with brass housing, snap-in design, snap-in locked with female connector for sensing coolant return temperature, fan-speed control...

One of the growing areas for PAB blend applications under the hood is in electrical and electronic connectors and systems for power distribution and control. Such applications often require low melt viscosity at injection molding temperatures to fill the intricate tooling that may be designed for up to hundreds of individual electrical connections. Practical toughness is required for snap-fit of the connections. Furthermore, glass-reinforcement of these PAB s may be required to improve modulus and dimensional stability. Typical blends suitable for these applications include PBT/PC, PA/PPE and PPS/PEI. 

Figure 4.8 shows a part manufactured from PVC to protect the lens assembly of a projection TV. There are many elements in the design, including a snap-fit connector (32), standoff (30), protrusions (24) and (26), used for connection (32), spatial orientation (30), and angular orientation (24), (26). 

Reusable silver-silver chloride electrodes (Figure 26.4a) are made of silver disks coated electrolytically by silver chloride [1], or, alternatively, particles of silver and silver chloride are sintered together to form the metallic structure of the electrode. The gel is typically soaked into a foam pad or is applied directly in a pocket produced by the electrode housing. The electrode is secured to the skin by means of nonallergenic adhesive tape. The electrode is connected to the external instrumentation typically via a snap-on connector. Such electrodes are well suited for acute studies or basic research investigations. 

Fig. 16-9. This general-purpose connector employs crimp-on-snap-in contacts and one-piece insulator sections molded of polycarbonate.

The workhorse for connector moulding is unfilled nylon 66, because of its fitness for the underbonnet environment, and its useful combination of toughness and creep resistance, making it ideal for snap-fit assemblies which maintain positive contact. The formulators have had to respond to tightening specifications, particularly in respect of flame retardancy as a result there are grades available now which achieve the UL V-0 rating without losing the essential snap-fit-ability . 

Also, the operator must pay special attention to handling and ESD damage while placing components. Also, those components that incorporate snap-in features (e.g., connectors) can reqnire that the operator exert relatively high forces on the circuit board. Thus, the operator must not damage either that component or other components and the circuit board. Often, special tooling is used to press snap-in components on the circuit board to prevent such damage. 

As shown in Figure 8.7, the Miller-Brooks system is rather complicated. The electrode basic assembly is Teflon fitted with appropriate metal connectors. The general principle is that of a snap fastener with skin rather than fabric as the associated medium. The center post of the assembly is wrapped with velour fabric which is bonded to the post by adhesive. The purpose of this is to form a substrate to which tissue can adhere after surgical implantation. While the developers of this scheme have reported excellent results, placement and removal of the snap assembly is cumbersome. 

Applications appliance parts, automotive, photolithographic emulsions, semiconductor components, snap-lock connectors, solar energy components ... 

As shown in Fig. 7.12, the connector was designed with an T beam cross-section, which provided the basic cavity for insertion of the contacts. Runner slots were designed into the connector to accept a contact-retaining insulator, which prevented the contacts snapping out of their pre-loaded position. Each contact slot has an integrally moulded shoulder, providing a support for the contact strip prior to insertion. 

Are snap-hooks unless the locking type not attached to a dee-ring to which another snap-hook or other connector is already attached ... 

Both board-attached and wire harness connectors benefit from SPS s excellent thermal diffusivity, defined as the ratio of thermal conductivity to volumetric heat capacity. As a result, cycle time models show that injection-molded parts cool quickly in the mold, helping to minimize cycle time and improve dimensional stability of their complex, molded features such as the terminal snap fit features on harness connectors. Tool designers typically cannot place cooling lines in close proximity to these features and the cooling characteristics of SPS are essential to minimizing the cycle time during manufacturing. 

Connectors (Dee-rings and snap-hooks) shall have been proof-tested to 1600 kg and have a minimum tensile strength of 2,250 kg. 

Snap hooks connect the harness to one end of lanyards or lifelines. Effective January 1, 1998, only double-locking snap hooks can be used. Traditional single locking snap hooks cannot be connected to each other because of the possibility of an employee roll-out. A lanyard is a flexible line of rope, wire rope, or strap that has a connector at each end. Lifelines use a flexible line that connects to an anchorage point in the fall arrest system. 

Typical applications for acetal include molded gears, mechanisms, disposable lighters, and snap-fit connectors. No doubt about it, acetal is a critical component of the material palette for any serious design engineer (Figure 4.11). 

PAR are employed in automotive parts, semiconductor components, ovenware, electronic devices, solar energy components, appliance parts, and snap lock connectors. 

---