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Heavy-Duty Battery-Powered Electric Drill: Riley & Elligson, 1965

Robert H. Riley Jr. & Daniel M. Elligson (US Patent 3,213,305) · Public domain (expired patent)

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12. 10월 2026

Heavy-Duty Battery-Powered Electric Drill: Riley & Elligson, 1965

Robert H. Riley Jr. and Daniel M. Elligson of Black & Decker patented a cordless drill in 1965, US 3,213,305, with about the torque of a corded half-inch drill, for contractors and line workers. A permanent-magnet DC motor drives the chuck through a two-speed gearbox. Two hollow side handles each hold a slide-out pack of rechargeable nickel-cadmium or silver-cadmium cells, wired in series with the motor and a trigger switch. Their working model had 18 silver-cadmium cells, about 25 volts in all, and gave 550 rpm in high and 225 rpm with 28 foot-pounds of torque in low. The low voltage made it safe in ordinarily hazardous conditions, such as boat maintenance and repair.

고급

Factory process

안내

Field case and motor

Retain the field assembly, two permanent-magnet tubular segments glued inside a concentric sleeve, in the field case. Fit the brushholders in two bosses at the rear, with silver-graphite brushes riding on the commutator of the wound laminated armature. The working model's armature has 16 slots, each with 10 turns of No. 18 wire.

이 단계의 재료:

드릴 필드 케이스1 개

영구자석 계자 조립체1 개

정류자가 있는 권선 적층 전기자1 개

은흑연 브러시와 홀더1 개

필요한 도구:

드라이버 세트

Gear case

Secure the gear case cover ahead of the field case and the gear case ahead of that. The armature pinion drives an intermediate gear and shaft carrying two pinions; a gear cluster slides on the splined output spindle, and a shift lever turning an eccentric shaft through about 180 degrees moves it to mesh one pinion or the other, for high or low speed. Fit the chuck on the spindle.

이 단계의 재료:

드릴 기어 케이스 커버1 개

드릴 기어 케이스1 개

드릴 2단 변속기1 개

드릴 척1 개

필요한 도구:

드라이버 세트

Battery handles

Screw a hollow handle to each side of the field case, in line with each other and across the drill's axis. Slide a battery pack into each from its open end and close it with a quick-release cover held by a locking spring, with a leaf spring pressing the pack onto the contacts. Fit the end handle at the rear.

이 단계의 재료:

속이 빈 배터리 손잡이2 개

빼낼 수 있는 충전식 배터리 팩2 개

퀵 릴리스 손잡이 커버2 개

뒤 손잡이1 개

필요한 도구:

드라이버 세트

Contacts and trigger

Secure an insulated block with leaf-spring contacts at the top and bottom of the field case to meet each pack's terminals, and wire the packs, the switch contacts and the brushes in series. Pivot the spring-loaded trigger on the gear case cover so its contact bridges the two switch buttons; a sliding pin locks it on or off.

이 단계의 재료: