Spring band clamp a clamping band for hoses and other cylindrical objects consists of a flat metal strap having a repetitive pattern configuration to provide desired amounts of elastic and plastic stretch capability and a pawl and tooth connection for adjustable joining the ends of the strap. In all embodiments the strap includes apertures evenly distributed throughout the circumference of the band to achieve desired stress/strain characteristics. In certain embodiments the apertures comprise circular punched holes and the strap may further include transverse or circumferentially extending slits to form the desired pattern,suitable for high volume manufacturing techniques.
Metal bands have been used for hose clamps and similar applications wherein it is desired to secure an elastomeric member to a rigid part or to apply compressive force to a resilient object for any number of applications. In certain of these applications,it is desired that the band be automatically adjusted or tightened during use to accommodate changed conditions and it is desirable to have a certain degree of spring in the band to automatically achieve this end.
Another application for a clamping band is to secure an elastomeric dust cover to a drive shaft or the like. This application is considerably different in that the underlying structure is relatively inelastic and any continuing clamping force must be derived substantially from the band clamp itself. It is further apparent,that if resilience in the combined structure is required in order to engage the ends of the clamp,such resilience must be provided substantially wholly by the clamp,and still retain its spring-like characteristics, once installed.
The clamp of the Spring band clamp comprises a thin,flat,elongated sheet of material,preferably metal such as stainless steel or the like,which may be formed into a circle to surround an object to be clamped and which is secured at its ends in any of several conventional manners. The metal sheet is formed in a particular manner throughout its circumference to provide a plurality of distributed bending sections which form slightly under tension and return to their original shape to provide resilience or springiness to the band. The pattern of the metal sheet may differ for varying applications but essentially will comprise a plurality of repetitive shapes each of which therefore contributes substantially equally to the overall band resilience. This configuration provides a relatively low level of stretch,but is sturdy and finds particular application in the clamping of rigid objects.