Browse Prior Art Database

COUNTERBALANCED HINGE ASSEMBLY

IP.com Disclosure Number: IPCOM000025118D
Original Publication Date: 1983-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 75K

Publishing Venue

Xerox Disclosure Journal

Abstract

A counterbalanced hinge assembly is illustrated for a top cover 10 of machine I1 comprising a fixed frame 12 for the hinge secured to the machine and a movable frame 13 secured to the cover and pivoted to the frame 12 by a pivot pin 14. The counterbalanced hinge derives its counterbalance forces through compression of a Belleville-type spring 15 captured in the split position of an expandable/con-tractable two piece arm 16, 17 attached at one end by clevis mounting 18 to the cover and to the hinge 12, 13.

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KEROX DISCLOSURE JOURNAL

COUNTERBALANCED HINGE ASSEMBLY Proposed Classification Edmund C. Keenan US. C1. 16/319

Int. C1. E05d 11 /10

rOFFSET

FIG. 3

Volume 8 Number 5 September/October 1983 373

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COUNTERBALANCED HINGE ASSEMBLY (Cont'd)

A counterbalanced hinge assembly is illustrated for a top cover 10 of machine I1 comprising a fixed frame 12 for the hinge secured to the machine and a movable frame 13 secured to the cover and pivoted to the frame 12 by a pivot pin 14. The counterbalanced hinge derives its counterbalance forces through compression of a Belleville-type spring 15 captured in the split position of an expandable/con- tractable two piece arm 16, 17 attached at one end by clevis mounting 18 to the cover and to the hinge 12, 13.

Through an appropriate adjustable preload of the Belleville spring, contraction of the arm 16, 17 in the movement of the cover from an open to a closed postion, from Figure 1 to Figure 2, will compress the spring 15 to a predetermined amount, producing vertical component forces sufficient to produce a controlled counter- balanced movement of the cover. Conversely, the same type of effect would be produced in going from a closed to an open position.

The unique principle involved is that the lower end 17 of the arm is not pivoted on the axis of the pin 14 but rather at some discrete point below this pivot axis, as shown in Figure 3, as determined by the geometry produ...