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Battery Holder: Four C Cells in Two Sprung Compartments with a Z-Shaped Retainer (Lund 1979)

أنشأه

28. أكتوبر 2026

Battery Holder: Four C Cells in Two Sprung Compartments with a Z-Shaped Retainer (Lund 1979)

A tray for four C cells in series, made for an instrument that gets knocked about. Each compartment holds two cells end to end, pressed together by a cone-shaped coil spring. The cells can shift a little under a blow and spring back without losing contact. A small Z-shaped retainer holds down one cell in each row and still lets every cell be taken out. Source: John Lund, US 4,161,568 (Schonstedt Instrument Co., 1979), with all sizes. Unknown: the plastic, the metals and the spring wire size. Lund names none of them, and nothing makes a self-tapping screw yet, so these are linked to unknown heads. The tools are ours. Picture: the patent's Fig. 1.

متوسط

1 day

التعليمات

Mould the tray

Mould a tray 4.325 × 2.500 × 0.875 in (109.9 × 63.5 × 22.2 mm) with two parallel open-top compartments, each 4.125 in long, 1.025 in wide and 0.800 in deep inside (104.8 × 26.0 × 20.3 mm). The middle wall is 0.300 in (7.6 mm) thick, with a notch at one end. Mould two small abutments on the middle wall, 1.000 in (25.4 mm) apart. Unknown: the plastic.

المواد لهذه الخطوة:

مادة عازلة غير معروفة1 as required

الأدوات المطلوبة:

قالب القولبة بالكبس

قدمة ورنية

Wind the two spring contacts

Wind two cone-shaped coil springs: 0.562 in (14.3 mm) outside diameter at the large end, 0.312 in (7.9 mm) inside at the small end, 1/2 in (12.7 mm) long free, closing to 1/8 in (3.2 mm). Each has three active turns, and the end turns are wound flat. Leave one spring with a long straight tail. Unknown: the metal and the wire size.

المواد لهذه الخطوة:

معدن غير معروف1 as required

الأدوات المطلوبة:

زرادية مستديرة الفك

كماشة مسطّحة الفكّين

قدمة ورنية

Fit the contacts and terminals

Put one spring at the far end of the first compartment, with its straight tail, and the other at the near end of the second. Set an eyelet contact in the end wall opposite each spring. Run the tail through the notch in the middle wall to the eyelet contact at the far end of the second compartment. Fix two terminals to the near end wall with eyelets, each holding its contact.

المواد لهذه الخطوة:

معدن غير معروف1 as required

الأدوات المطلوبة:

مقصّ صفائح

كماشة مسطّحة الفكّين

مبارد يدوية

Make and fix the retainer

Cut a flat Z-shaped retainer of plastic, 0.062 in (1.6 mm) thick and 0.980 in (24.9 mm) long. It is 0.430 in (10.9 mm) wide at each branched end. Each branch sticks out 0.130 in (3.3 mm) from the stem and runs 0.365 in (9.3 mm) along it. Screw it with a single self-tapping screw through the middle of the stem onto the top of the middle wall, between the abutments, so it cannot turn. Each branch reaches over one compartment.

المواد لهذه الخطوة:

مادة عازلة غير معروفة1 as required

برغي ذاتي التسنين1 pc

الأدوات المطلوبة:

مقصّ صفائح

مبارد يدوية

طقم مفكات

قدمة ورنية

Wire it

Solder lead wires to the two terminals. With the cells in, the four make one series supply between these terminals.

المواد لهذه الخطوة:

سلك توصيل1 as required

سلك لحام1 as required

الأدوات المطلوبة:

كاوية لحام

Load the cells

Put cell 1 into the free end of the first compartment, slide it along under the retainer until it meets the spring, then drop cell 2 in behind it, pressing the spring a little. Load the second compartment from its other end the same way. To unload, lift out the two free cells, then slide the held cells along into their places and lift them out. Ours: check the voltage across the terminals with a meter.

الأدوات المطلوبة: