Retractable cord reel

• US 4,141,438 A
• Filed: 11/18/1977
• Issued: 02/27/1979
• Est. Priority Date: 01/03/1977
• Status: Expired due to Term

• Current Assignee: Clarence J. Diem
• Original Assignee: Clarence J. Diem
• Inventors: Diem, Clarence J.
• Primary Examiner(s): Blix, Trygve M.
• Assistant Examiner(s): Eisenzopf, Reinhard J.
• Application Number:
  US05/852,709
• Time in Patent Office: 466 Days
• Field of Search: 191/12.2 R, 191/12.4, 242/107.7, 339/2 R, 339/2 RL, 339/3 R, 339/5 R, 339/5 RL, 339/6 R, 339/6 RL, 339/8 R, 339/8 RL
• US Class Current: 191/12.4
• CPC Class Codes: H02G 11/02 using take-up reel or drum

Abstract

A reel assembly is especially adapted for winding an electrical service cord in either recreational or industrial vehicles. The reel has flanges rotatively mounted to an arbor, and only one end of the arbor is fastened to a rigid supporting member. The reel assembly therefore has one flange clear of any obstruction so that the electrical cord can be wound readily over the end of the reel to adjust tension, and the mounting provides easy assembly and disassembly. In a preferred embodiment, the reel is held on the arbor by a single fastener associated with a slip-ring assembly. A notched ratchet disk has protrusions adjacent its notches to cause a pawl to jump across the notches except at slow speeds. For safety, a grounding circuit is completed through a special conductive, retractive spring to eliminate open circuits sometimes encountered with usual sets of electrical contacts.

Claims

1. A reel assembly comprising:

first and second flanges connected together,

an electrical cord to be wound between said flanges, said cord having one end connected to said flanges and having a plurality of power conductors and a grounding conductor,

a plurality of power supply leads and a grounding lead for appliances that utilize power,

a stationary arbor, said arbor having one end with mounting means, a rigid supporting member, said mounting means connected to said rigid supporting member for providing full support for said arbor,

means for rotatively mounting said first and second flanges coaxially on said arbor,

a flat spiral electrically conductive spring having sufficient strength to retract said cord, said spring having an inner end with a turn about said arbor and an outer end connected to said first flange, said arbor having means to prevent rotation of said inner end as said spring is wound, said grounding lead for appliances electrically connected to said inner end of said spring, said grounding conductor of said electrical cord at said one end thereof connected to said outer end of said spring,

a slip-ring assembly having a rotative portion secured to said flanges and electrically connected to said plurality of power conductors and a stationary portion secured to said rigid supporting member and electrically connected to said power supply leads, and

ratchet means connected between said flanges and said supporting member.

2. A reel assembly as claimed in claim 1 wherein said arbor has a central bore, said rotative portion of said slip-ring assembly is fastened coaxially to said flanges at a position on said second flange opposite to both said first flange and said rigid supporting member,

said stationary portion of said slip-ring assembly has a tubular portion extending through said bore of said arbor, and end of said tubular portion extending through said rigid supporting member, and

retaining means connected between said end of said tubular portion and said rigid supporting member, said stationary portion bearing against said rotative portion of said slip-ring assembly to retain said rotative portion and said flanges that are connected thereto coaxially on said arbor, and

said power supply leads extending through said tubular portion.

3. A reel assembly as claimed in claim 2 wherein said means for rotatively mounting said first and second flanges includes an axle, said axle having one end fastened to both said rotative portion of said slip-ring assembly and said flanges and the other end fitting as a bearing within said bore of said arbor, and said axle having an axial bore through which extends said tubular portion of said slip-ring assembly.

4. A reel assembly as claimed in claim 1 wherein said ratchet means comprises:

a ratchet disk secured coaxially and rigidly to said first flange, the peripheral circular edge of said disk having at least one notch,

a pawl comprising a rigid portion rotatively fastened to said rigid supporting member for rotation on an axis parallel to the longitudinal axis of said arbor and an end portion urged against said peripheral circular edge of said ratchet disk and adapted to enter said notch, said pawl upon entering said notch stopping rotation of said reel in the direction in which the reel is being urged by force of said spring,

said peripheral surface of said disk having a protrusion adjacent that side of said notch that first encounters said end portion of said pawl during rotation of said reel caused by the unwinding of said spring, and said protrusion extending outwardly from the adjacent surface of said ratchet disk far enough to throw said end portion of said pawl outwardly to jump across said notch during retraction of said cord into said reel assembly at a normal rate above a predetermined slow rate.

5. A reel assembly as claimed in claim 4 having a protrusion adjacent each side of said notch to cause said end portion of said pawl to jump across said notch while said cord connected to said reel assembly is being either retracted or extended at any rate above a predetermined slow rate.

6. A reel assembly as claimed in claim 1 wherein said means to prevent rotation of said inner end of said spring includes a longitudinal groove within an outer wall of said arbor, said inner end of said spring having a curved portion fitting within said groove, said grounding lead extending within said groove and through said rigid supporting member, a conductive terminal passing through said flanges, said grounding conductor of said electrical cord being connected to one end of said terminal and a conductor connected between the other end of said terminal and said outer end of said spring.