Title: Power and free trolley apparatus

Abstract: Improved power and free trolley apparatus includes independent pusher and hold back dogs positively moved to an accumulate position by a counterweighted actuating lever moving to an accumulate position. The dogs, however, are self-biased, the pusher dog self-locking in its drive position, and the dogs are not interlocked with the lever. They move independently of the lever into operative position when the lever is moved into a non-actuating position and out of blocking relationship with the dogs. The actuating lever counterweight defines a trolley brake for preventing excessive trolley bounce back during accumulation. Another aspect of the invention includes a movable cam selectively raising a drive dog in a trailing trolley for switching, and permitting accumulation of trolleys through a switch zone when held in an inoperative position as when the switch zone is choked.

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Inventors: Krammer, deceased, Robert (LATE OF White Bear Lake, MN, US)

Application Number: 837275
Filing Date: 1977-09-27
Publication_date: 1979-03-13
Assignee: A-T-O Inc. (Willoughby, OH)
Primary Class(es): 104/172.4 104/103
Other Classes:
US Patent Ref:

3044416	Jul, 1962	Reibel et al.	104/172.
3397650	Aug, 1968	Kondur et al.	104/172.
3420188	Jan, 1969	Dehne et al.	104/178.
3874304	Apr, 1975	Robert	104/172.
3882787	May, 1975	Turner	104/172.

Other Refs:
Primary Examiner: Makay, Albert J.
Assistant Examiner: Reese, Randolph A.
Attorney: Wood, Herron & Evans