[PRCo] Re: Pgh Railways Street Car Operators Wanted Ad

[John Swindler]

True, Phil.  Probably lots of ways to take the shoe pressure.  But this is a quick method - takes about 15 seconds.  Tie loop in trolley rope, hook spring gauge into loop, and pull down vertically.  And it only takes one person.

 

At first I thought there would be a much longer hook on the spring gauge to reach the 'bridle' used on SEPTA's cars.  Instead a loop is made in the trolley rope.

 

John 

 

 


 
> Date: Mon, 26 Oct 2009 18:25:17 -0700
> From: pcc_sr at yahoo.com
> Subject: [PRCo] Re: Pgh Railways Street Car Operators Wanted Ad
> To: pittsburgh-railways at dementia.org
> 
> Mr.Swindler;
> It seems that after the fact we can make a mountain
> into a mole hill can't we. There is more than one way
> to make the measurement. I have seen it done with
> all people on the ground and a rope over the shoe
> itself. Simply make a longer rope / wire to place on the
> spring gauge then over the shoe. Not at all unsafe is it.
> 
> 
> Phil
> 
> 
> 
> ________________________________
> From: John Swindler <j_swindler at hotmail.com>
> To: pittsburgh-railways at dementia.org
> Sent: Mon, October 26, 2009 1:36:16 PM
> Subject: [PRCo] Re: Pgh Railways Street Car Operators Wanted Ad
> 
> Hi Phil
> 
> Then that would present a safety issue. 
> Better to keep the maintenance person on the ground
> when checking the pole pressure. The spring 
> gauge is only about two feet long.
> 
> J
> 
> 
> > Date: Mon, 26 Oct 2009 10:32:31 -0700
> > From: pcc_sr at yahoo.com
> > Subject: [PRCo] Re: Pgh Railways Street Car Operators Wanted Ad
> > To: pittsburgh-railways at dementia.org
> > 
> > From: John Swindler <j_swindler at hotmail.com>
> > To: pittsburgh-railways at dementia.org
> > Sent: Mon, October 26, 2009 5:55:25 AM
> > Subject: [PRCo] Re: Pgh Railways Street Car Operators Wanted Ad
> > 
> > 
> > System component 4.65 in the PCC2 state inspection
> > manual requires the pole tension to be : 
> > "check shoe pressure against wire (25 to 30 ft. lbs.)
> > using a spring gauge. 
> > 
> > This is done by tying a short loop in the trolley rope
> > (Elmwood has some ex. Navy men) and using a spring gauge. 
> > The tension can be adjusted at the trolley base. 
> > There's a "U" clamp on the pole that can be moved. 
> > Also nut and bolt assembly with each spring. 
> > 
> > 
> > Cheers
> > 
> > John
> > ________________________________
> > 
> > ________________________________
> > Mr.Swindler;
> > 
> > Picking a little with the above: Spring gauge should be looped
> > over the trolley shoe, not attached to the trolley rope. While
> > modest, the spring which keeps the rope taut will add to the
> > tension needed. I.e., if the rope exerts a 1-pound pull with the
> > shoe at 18-feet, then the actual pressure from the pole is
> > 26-pounds (assuming 25-pounds pressure desired -- 26#
> > minus the 1-pound pull of the rope = 25#.)
> > 
> > Phil
> > 
> > 
> > 
> > > > On Oct 25, 2009, at 2:48 PM, TEP wrote:
> > > >
> > > >
> > > > No typo. The carbon shoes on a trolleybus require slightly
> > > > more than twice the upward spring force of a streetcar
> > > > trolley pole, nominally 72 lb each.
> > > > They have to stay on even when off-centre --
> > > > the maximum roam is 14 ft.
> > > >
> > > > The operator is instructed to only handle one pole at a
> > > > time but this is often breeched meaning grabbing both
> > > > ropes at once -- and the 140 lb uplift requires at least
> > > > that body weight according to my physics.
> > > >
> > > >
> > > > Tom P.
> > > > -----------
> > > >
> > > > Phillip Clark Campbell wrote: 2: Is that a typo - 70#?
> > > > Ohio Brass recommends a maximum of 30-32
> > > > pounds for wheels; 25-30 pounds for shoes at 
> > > > wire height of 18-feet. I understand Prc used
> > > > a modestly higher figure for interurbans.
> > > > In 1941 which we are discussing, OB was the
> > > > standard to follow. Modern trolley poles today
> > > > may use less 'tension' as mass of pole is lighter.
> > > > 70# is almost triple the low figure for shoes;
> > > > poles would snap in two under such tension
> > > > while severe damage would result to the
> > > > overhead on dewirements regardless of
> > > > effectiveness of retrievers.
> > 
> > 
> > 
> > 
> > 
> > 
> 
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