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

[Phillip Clark Campbell]

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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