The following article contains an answer for the question: Who is the worker the boy beagle knocks using the spinning bars? , can you please find it? 

Oswald is walking merrily on the road, heading towards the county fair. On his way, the boy beagle is expelled out of the house by a disgruntled father. The father dog roughs up the boy beagle some more before returning indoors. Feeling sorry for his little friend, Oswald decides to take the little dog along.
At the fair, Oswald and the boy beagle disguise themselves as a single customer in an attempt to just pay for one ticket. But their cover is blown when they stumble, prompting the ticket seller to shoo them. Annoyed by that employee, the boy beagle assaults the ticket seller, eventually knocking the latter out of the ticket booth.
Going further into fair, the boy beagle wishes to board the roller coaster. But when a guard demands for a ticket which he has none, the little dog decides to just harass the guard, momentarily knocking that worker using the spinning bars. Oswald, who tries to take him, would also be knocked down by those bars.
Oswald chases the boy beagle into the trousers of a hefty tourist. While the little dog is able to get out of the pants, the rabbit gets stuck. The boy beagle begins pelting Oswald in the head with some baseballs.
Oswald then pursues the boy beagle into a high striker which the little dog climbs up. Oswald strikes the lever with a mallet but the boy beagle is able to dodge the bell-hitting mechanism. Oswald strikes the lever once more but harder. The impact of the second hit was so powerful that the high striker collapses. The rabbit then captures the boy beagle in a way that the tiny canine cannot escape.

a guard