Camming device for climbing or use thereof

a technology of climbing cams and camming devices, which is applied in the field of climbing cams, can solve the problems of increasing the weight of single axle camming devices over the weight of double axle camming devices, and requiring delicate balance between strength and fall protection, and achieves the effect of increasing the static co-efficient of friction

Inactive Publication Date: 2006-10-19
ROBERTSON BRYSON DAVID ROSS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0038] In another aspect of the invention, a method of manufacturing an improved a camming device is provided. The camming device is comprised of at least one pair of lobes, one axle per pair of lobes, a stem, a loop and a release mechanism, the lobes comprising: a face having a contact area; an inside edge; an apical end; and a basal end, to define an inner surface and an outer surface. The method comprises increasing the static co-efficient of friction on a contact area by affixing a semi-metallic composition to the contact area.

Problems solved by technology

Fall protection requires a delicate balance between strength requirements and weight conservation.
However, this gain may be offset by the increased weight of the double axle camming devices over that of the single axle camming devices.
The problem for climbers is how to reduce the weight required for climbing while remaining within an acceptable safety margin, based on fit of the camming device in the crack and strength of the camming device.

Method used

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  • Camming device for climbing or use thereof
  • Camming device for climbing or use thereof
  • Camming device for climbing or use thereof

Examples

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example 1

[0066] Detailed friction testing of five advanced composite friction materials against 8 different types of rock, laboratory testing of twelve different two-part adhesives (including expoxies, acrylics and urethanes) for break away and internal strength and extensive research into new market products, in terms of cords, heat shrink tubing and metal based putties was carried out. This led to inventing a camming device with an 81.3% increase in the standard working range and a 34.5% reduction in stem weight.

TABLE 1Friction Material TestingCo-Efficient of Friction (μ)(Frictional Force / Normal Force)AFT-AFT-Al-F4-3-Friction MaterialsHF-61901010062006106252Rock TypesBlack Sandstone0.380.580.450.350.480.38Green Sandstone0.480.410.620.530.530.64Yellow Quartzite0.590.620.620.550.520.55Pink Quartzite0.630.610.660.060.420.58Gneiss0.530.660.560.470.420.46Basalt0.330.550.330.390.340.45Limestone0.430.550.270.390.360.23White Granite0.670.670.510.540.450.43Average Co-Efficient0.510.580.500.410.44...

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Abstract

A camming device is provided that has a superior range of operation, is lighter and has lower internal compressive forces. The improvement is a result of using a composition having a co-efficient of friction ranging between 0.35-0.55 affixed to the contact area, for example, a semi-metallic composition. An improved method of fall protection is also provided, as is a method of manufacture.

Description

RELATED APPLICATIONS [0001] This application claims priority to U.S. provisional patent application Ser. No. 60 / 672569, filed 18 Feb., 2005, entitled Camming Device for Climbing and Use Thereof.FIELD OF THE INVENTION [0002] This invention is related to devices to assist rock and mountain climbers. Specifically, this invention is a climbing cam that has a superior range as a result of long-lasting high friction material on the face of the cam and low weight “rope” stem. BACKGROUND OF THE INVENTION [0003] Mountain climbing is a sport of limits. Rock climbers are relentlessly striving to push these limits by enduring personal physical pain, improving technical climbing abilities and inventing innovative technical gear. Lowering weight and increasing strength of climbing gear are the fundamental improvements that are required to extend the limits of climbable routes. Fall protection is the key aspect to this. Fall protection is what a climber uses to secure himself / herself to the rock f...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A47F5/08
CPCA63B2209/00A63B29/024
Inventor ROBERTSON, BRYSON DAVID ROSSTHUMLERT, SCOTT JACOBDAWES, REESE MORLEY
Owner ROBERTSON BRYSON DAVID ROSS
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