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# Linear Motion Decelerator

IP.com Disclosure Number: IPCOM000092482D
Original Publication Date: 1966-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 39K

IBM

## Related People

McConnell, JF: AUTHOR [+2]

## Abstract

This linear motion decelerator absorbs most of the energy of a moving member. The decelerator does not return this energy to the moving member as it returns to its rest position. The decelerator also limits the forces applied during deceleration to a predetermined value. The latter is independent of the moving member's velocity or energy within certain limits. If the velocity exceeds these limits, the final step for the system acts in such a manner so that only a small portion of this final energy is returned.

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Linear Motion Decelerator

This linear motion decelerator absorbs most of the energy of a moving member. The decelerator does not return this energy to the moving member as it returns to its rest position. The decelerator also limits the forces applied during deceleration to a predetermined value. The latter is independent of the moving member's velocity or energy within certain limits. If the velocity exceeds these limits, the final step for the system acts in such a manner so that only a small portion of this final energy is returned.

Member 11 moving at a velocity V1 in a linear direction defined by the arrow has attached to it wedge 13. The latter contacts studs 15 and 17 of scissor device 19. Device 19 is preloaded by spring 21 to apply a normal force N to each side of wedge 13 when the wedge contacts studs 15 and 17.

The force diagram at stud 15 shows the forces which act on wedge 13 at studs 15 and 17 when the wedge travels at velocity V1. The force diagram at stud 17 which the forces which act at studs 15 and 17 when wedge 13 travels in an opposite direction at velocity V2.

When wedge 13 contacts studs 15 and 17, frictional force mu N develops along the surfaces of the wedge. Normal force N and frictional force mu N combine to form resultant force R. The latter has a horizontal component F which decelerates the moving member. This force is expressed by

(Image Omitted)

where mu is the coefficient of friction between the wedge and the stud. Since there are two sides to the wedge, the total decelerating force is 2F. The equation describes the decelerating force as a function of normal force N, mu, and the wedge angle. The normal force is a function of the spring force which holds the scissor device together. The normal force variation can be held to a minimum by pre-loading the scissors in their initial...