Browse Prior Art Database

Extension Device for Constant Force Springs

IP.com Disclosure Number: IPCOM000060790D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Cimijotti, RL: AUTHOR [+4]

Abstract

The extension device for constant force springs eliminates safety concerns and meets automatic assembly requirements which require (a) that assembly loadings or forces be kept to a minimum to accommodate robot assembly and (b) that location features of mating parts be controlled to provide accurate positioning. In Fig. 1, spring 1 wound on spool 2 is attached to anchor 3 via pin 4. Interposed between spring 1 and anchor 3 are: a. Platform 5, integrally attached or cast onto anchor 3--Platform 5 prevents the spring from rolling up on itself and provides vertical dimensional control Y between the spool pivot 6 and the anchor mount 7. b. Leg 8 and tab 9, integrally cast onto anchor 3--Provide horizontal dimensional control X between pivot 6 and mount 7.

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Extension Device for Constant Force Springs

The extension device for constant force springs eliminates safety concerns and meets automatic assembly requirements which require (a) that assembly loadings or forces be kept to a minimum to accommodate robot assembly and (b) that location features of mating parts be controlled to provide accurate positioning. In Fig. 1, spring 1 wound on spool 2 is attached to anchor 3 via pin
4. Interposed between spring 1 and anchor 3 are: a. Platform 5, integrally attached or cast onto anchor 3--Platform 5 prevents the spring from rolling up on itself and provides vertical dimensional control Y between the spool pivot 6 and the anchor mount 7. b. Leg 8 and tab 9, integrally cast onto anchor 3--Provide horizontal dimensional control X between pivot 6 and mount 7. Tab 9 ensures that the spool is in intimate contact with leg 8 by providing pressure on spring 1, pushing the spool in the correct direction. Since X and Y are thus fully controlled and repeatable, the condition (b) for automated assembly is satisfied. In the assembly, Fig. 2 mounting hardware not shown for clarity, lift plate 10 is assembled to upright 11 with the spring mounting ledge 12 protruding through slot 13. Spring assembly 14 is mounted to pivot 15 on upright 11 with the anchor mount 7 positioned over mounting ledge 12 on lift plate 10. Lift plate 10 is installed in a manufacturing position which provides clearance between the engagement surfaces 16 on both the li...