[From nobody Mon Jan 14 08:17:56 2013 Received: from mailsorter-101-4.iap.bryant.webtv.net (209.240.198.29) by storefull-162.iap.bryant.webtv.net with WTV-SMTP; Sat, 22 Apr 2000 20:33:21 -0700 (PDT) Return-Path: <shadow+bounces@dementia.org> Received: from alycia.dementia.org (ALYCIA.DEMENTIA.ORG [128.2.35.149]) by mailsorter-101-4.iap.bryant.webtv.net (8.8.8-wtv-f/ms.dwm.v7+dul2) with ESMTP id UAA17045; Sat, 22 Apr 2000 20:33:20 -0700 (PDT) Received: (from daemon@localhost) by alycia.dementia.org (8.9.1a/8.9.0) id XAA16537 for pittsburgh-railways-outgoing; Sat, 22 Apr 2000 23:21:18 -0400 (EDT) Received: from mta5.snfc21.pbi.net (mta5.snfc21.pbi.net [206.13.28.241]) by alycia.dementia.org (8.9.1a/8.9.0) with ESMTP id XAA16533 for <pittsburgh-railways@dementia.org>; Sat, 22 Apr 2000 23:21:13 -0400 (EDT) Received: from LOCALNAME (ppp-206-170-0-99.snfc21.pacbell.net) by mta5.snfc21.pbi.net (Sun Internet Mail Server sims.3.5.2000.01.05.12.18.p9) with SMTP id <0FTG00MY199IL4@mta5.snfc21.pbi.net> for pittsburgh-railways@dementia.org; Sat, 22 Apr 2000 20:20:09 -0700 (PDT) Date: Sat, 22 Apr 2000 20:19:04 -0700 From: Jim Holland <pghpcc@pacbell.net> Subject: Trolley Pole Wheels To: PRCo -- WP -- JTC -- The Big *3* -- <pittsburgh-railways@dementia.org> Message-id: <39026BA8.6368@pacbell.net> Organization: Holland Electric Railway Operation MIME-version: 1.0 X-Mailer: Mozilla 3.03C-PBXG (Win16; U) Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit Sender: owner-pittsburgh-railways@dementia.org Precedence: bulk Reply-To: pittsburgh-railways@dementia.org Greetings! Ohio Brass offered trolley pole wheels with three different groove formations: 1)--U-groove with 7/16" radius. 2)--A.T.A. groove with 3/8" radius. 3)--V-groove with a 5/16" radius at the bottom of the V. This is not trivia - I am actually searching for an answer - which did PRCo use? Other interesting info quoting from Ohio Brass Catalog #25::::::: "While the Form-6 Trolley Wheel and Harp is designed primarily for high speed city service, it is being used successfully on all types of city cars. Basically this wheel differs from former O-B wheels only in the fact that the size of the axle has been reduced from 1-5/8 to 1-1/4 inches." "This smaller axle makes possible increased mileage with much less wear on axle and bore of wheel. Due to the fact that there is a definite relationship between the diameter of the axle and the diameter of the wheel which is particularly effective at high speeds, the wheel size for all types of service is limited to 5-3/4 inches." ". . . The fact that it is unnecessary to oil this wheel after it has once been installed accounts for much of its present popularity. As illustrated in Figure 2, the axle is constructed so that lubrication is accomplished by three force-feed graphite plugs. The axle is hardened and ground to insure minimum friction and long service life." ". . . So that this device will have ample current carrying capacity it is provided with two side current collecting contact washers which are held in constant contact with the hub of the wheel by phosphor bronze springs, see Figure 1. This provides a direct and excellent current path from wheel to harp." ". . . Trolley wheels are cast from high-grade bronze developed for this particular service and made only from new metal." James B. Holland ------- -- --------- Pittsburgh Railways Company (PRCo), June of 1949 -- June of 1953 To e-mail *privately,* please click here: mailto:pghpcc@pacbell.net N.M.R.A. Life member #2190; http://www.mcs.net:80/~weyand/nmra/ ]