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Push Button: Normally Open Momentary Switch with a Cushioned Contact (De Reamer, GE 1939)
A panel push button that closes a circuit only while you press it. A spring holds the button out, and a metal rim on the end of its rod sits clear of two contacts. Press it and the rim bridges both contacts. A second spring inside the button lets the rod give, so the contacts never take more than that spring's force.
Source: Frank C. De Reamer, US 2,166,803 (General Electric, 1939), Fig. 5. Unknown: the insulating material, the metals and every size. De Reamer gives none of them, so they are linked to unknown heads. The tools are ours. Picture: the patent's Fig. 5.
高级
2 days
说明
1
1
Mould the housing
Mould the housing
Mould a cup-shaped housing of insulating material, with a boss on each of two opposite sides, a recess in the top of each boss, a groove inside below each boss, and a bead round the top. Unknown: the material, the sizes and the moulding.
此步骤所需材料：
未知绝缘材料1 as required所需工具：
模压模具
未知尺寸2
2
Make the terminals and contacts
Make the terminals and contacts
Bend two angled metal strips. The upper end of each sits in a boss recess, and the lower end is a solder lug. Fix each upper end to a contact that fits the groove inside the housing, stepped at its bottom end. Unknown: the metal.
此步骤所需材料：
未知金属1 as required所需工具：
铁皮剪
平口钳未知尺寸3
3
Make the sleeve, plate and cover
Make the sleeve, plate and cover
Turn a threaded sleeve and cut its thread. Spin its lower end over onto a metal plate with tangs. Cut a cover of insulating sheet with ears that reach over the bosses and a hole in the middle to guide the rod.
此步骤所需材料：
未知金属1 as required未知绝缘材料1 as required所需工具：
金属车床
车床刀具套装（HSS）
板牙架铁皮剪
游标卡尺未知尺寸4
4
Make the push button
Make the push button
Make a drawn metal tube closed at the top, and a rod with a head. Put a small coil spring in the top of the tube, then the rod's head. Wedge a washer into the tube under the head. Leave clearance so the rod can swivel a little. Turn the rod's lower end down to a smaller diameter. Unknown: the metal.
此步骤所需材料：
未知金属1 as required
压缩弹簧套装1 spring所需工具：
金属车床车床刀具套装（HSS）游标卡尺未知尺寸5
5
Assemble
Assemble
Set the terminals in their recesses and the contacts in their grooves. Slide the button into the sleeve, with a coil spring round the rod between the cover and the wedged washer. Pass the rod's end through the cover's hole. Put on it a loose insulating washer with a metal rim round its edge. Hammer the rod's end over into a flange. Lay the cover on the housing, so its ears clamp the terminals, and bend the plate's tangs over the bead.
此步骤所需材料：
未知绝缘材料1 as required未知金属1 as required压缩弹簧套装1 spring所需工具：
台虎钳
圆头锤平口钳
安全眼镜6
6
Mount and wire it
Mount and wire it
Put the sleeve through a hole in the panel and clamp the panel between two nuts on the thread. Solder the bared wire ends to the two lugs.
此步骤所需材料：
六角螺母2 pcs
焊锡丝1 as required所需工具：
电烙铁平口钳7
7
Check it
Check it
At rest, the rim sits against the underside of the cover and the circuit is open. Pressed, the rim meets the stepped ends of both contacts and closes it. The checking is ours: the meter reads open, then closed while pressed.
所需工具：
万用表材料
5- 1 as required占位符
- 1 as required占位符
- 1 spring占位符
- 2 pcs占位符
- 1 as required占位符
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