Timing Device, Clarence L. Elder, Patent No. 3,165,188
The patent by Clarence L. Elder of Baltimore, Maryland, describes a timing device designated as U.S. Patent No. 3,165,188. This invention is an electro-mechanical control apparatus engineered to meter prolonged, long-cycle operational durations—such as weekly, bi-weekly, or monthly intervals—for machinery, appliances, or utility meters. The mechanism employs non-monetary, geometric token-type control elements embedded with a continuous spiral mechanical tracking groove. This groove guides an electrical time control carriage across the token’s radius, shifting a central load switch upon cycle completion while allowing automated multi-cycle repetition and token ejectment via synchronized linear actuators and reduction gear trains.
The “Why” (The Industrial Pain Point)
Prior to this invention, conventional coin-operated and token-actuated timers were strictly limited to short, immediate operational durations, such as minutes or hours. Metering long-cycle intervals spanning multiple weeks or months required expensive, structurally fragile, and complex clockwork or electronic tracking systems. Standard vending or appliance tokens were easily counterfeited, held alternative monetary value, or caused frequent mechanical jams when stacked consecutively. Furthermore, if a user required extended machinery runtime, the system demanded manual intervention the precise moment the cycle lapsed. Industry required a rugged, foolproof, long-duration timer that could process proprietary token media sequentially without human monitoring, while natively supporting customizable grace periods or multi-pass automated timing cycles.
Inventor Section: Engineering Philosophy
Clarence L. Elder was a brilliant Black electronics engineer, inventor, and entrepreneur who established the Elder Systems Corporation in Baltimore during the height of the Civil Rights movement and the mid-20th-century industrial boom. Navigating the systemic barriers of the Jim Crow era, Elder focused his engineering philosophy on absolute system optimization, security, and automated logic integration. He specialized in designing robust, tamper-resistant control devices that translated data into physical geometric paths. Elder believed that industrial control hardware should be intrinsically safe, highly adaptable, and capable of executing complex electrical routing mechanically—minimizing reliance on fragile components while maintaining absolute operational reliability for commercial utility systems.
Key Systems Section
Heavy-Duty Multi-Stage Reduction Gear Train
- High-Torque Velocity Attenuation: A main electric motor translates high-velocity rotational kinetic energy into an ultra-slow timing cadence via a multi-tiered reduction assembly. A small drive pinion fixed to the motor shaft meshes with an intermediate spur gear.
- Orthogonal Force Transmission: The intermediate spur gear drives a secondary angular bevel pinion, which directly engages a large bevel gear. This structural arrangement rotates a terminal drive spindle at a highly damped rate, customized to complete a single full rotation every 24 hours.
Axial Token Engagement and Linear Ejection System
- Splined Interlocking Spindle: A primary drive shaft terminates in a splined pinning head engineered to slide axially into a central mounting aperture fabricated within the token.
- Solenoid-Actuated Drop Ejection: A slow-acting linear solenoid is coupled to the drive shaft. When the timing cycle expires, the solenoid energizes to shift the shaft axially perpendicular to the plane of the token, retracting the splined pin out of the token center. This strips the spent token from the drive axis and drops it down a discharge chute into a secure internal collection tray.
Radial Tracking and Multi-Bus Electrical Carriage System
- Linear Guide Rail Cross-Travel: An electrical time control unit is mounted on a fixed radial track positioned parallel to and extending over the radius of the token’s face. The carriage features an internal tracking finger that seats directly into a molded spiral groove on the rotating token. As the token rotates, the groove forces the carriage to glide linearly from the outer perimeter toward the central rotational axis.
- Sliding Busbar Interface: The carriage maintains continuous electrical continuity through spring-loaded contacts pressed against parallel metallic conductor strips embedded within a non-conductive Bakelite bracket. This busbar assembly routes current to the drive motor and coordinates signals to secondary relays.
Automated Sequential Feeding and Isolation System
- Gravity-Fed Alignment Channel: The system features an unloader chute bounded by parallel guide members designed to accept a plurality of tokens simultaneously. Each token is pressed with a structural alignment channel that rides along a stationary bar to maintain exact angular orientation during insertion.
- Mechanical Stop Isolation: To prevent the weight or friction of pending tokens from interfering with the active token, an automated mechanical stop isolates the second token in the queue. Once the primary token is stripped and ejected by the solenoid, the mechanical stop retracts, allowing the next token to drop into position.
Comparison Table
| Technical Metric / Feature | Standard Methods of the Time (Coin/Short-Term Timers) | The New Innovation (Elder Long-Cycle Token System) |
| Operational Cycle Duration | Restricted to short windows (minutes/hours) due to direct gear ratios. | Extended long-cycle metering (weeks/months) via multi-pass radial tracking. |
| Control Media Profile | Standard legal tender or generic metallic discs prone to theft and fraud. | Non-monetary tokens featuring unique geometric tracks or proprietary magnetic paths. |
| Token Processing Workflow | Manual, single-insertion operation requiring constant user reloading. | Automated sequential processing with consecutive gravity feeding and mechanical isolation. |
| Cycle End Action | Instantaneous power termination upon mechanical countdown lapse. | Programmable delay options supporting integrated grace periods or stepping switch repetition. |
| Ejection Mechanics | Mechanical trip levers prone to jamming or binding under heavy load. | Solenoid-driven axial retraction providing crisp, gravity-assisted drop discharge. |
Significance Section
- Precursor to Modern Prepaid Utility Metering: The concept of using geometric, non-monetary physical keys to activate remote long-term utility services laid the groundwork for modern smart-card and tokenized electronic prepaid gas and electric meters.
- Evolution of Automated Industrial Vending: Elder’s sequential token isolation and gravity-fed stacking architecture directly informed the mechanical handling arrays found in modern high-capacity industrial component dispensers and vending systems.
- Early Multi-Cycle Logic Integration: The implementation of a mechanical stepping switch working in tandem with a physical tracking carriage to execute repetitive cycles pre-dated the digital logic sequencing circuits utilized in automated manufacturing machinery.
