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Reversible-Tip Soft-Face Hammer: Domed Rubber Tips Locked in Screw-On Sockets by an Internal Rib (West & Robinson, 1962)
Robert F. West and Walter H. Robinson · Public domain
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Reversible-Tip Soft-Face Hammer: Domed Rubber Tips Locked in Screw-On Sockets by an Internal Rib (West & Robinson, 1962)

Robert F. West and Walter H. Robinson of Connecticut received US 3,040,792, dated 26 June 1962, for The Stanley Works. A tubular socket screws onto a threaded boss at each end of the hammer's head. A rubber tip, domed at both ends, is pushed into the socket past an internal rib, which bites into it, and its rubber fills short grooves so it cannot turn. The tip can be pulled out and turned round to use its other end. On its first blows the tip's inner face squeezes into an off-centre hole in the boss and forms its own dowel, which stops the socket unscrewing. The patent gives no sizes; every size here is ours.
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About 2 days

Maagizo

1

The tip's proportions

Inapakia daftari la Jupyter…
2

Read US 3,040,792

"Upon being subjected to the percussive forces during initial use, some of the plastic material of the inner face 27 of the striking tip 26 will be extruded or forced into the eccentrically located recess 12 in the boss surface 10 to provide a self-forming dowel pin 28 which effectively prevents inadvertent loosening of the threaded connection between boss and mounting socket during use."
3

Turn the head 2

From 35 mm steel bar turn a body 4 80 mm long with a boss 8 20 mm across and 15 mm long at each end; cut M20 threads on the bosses with the die. In each boss's end face drill a recess 12 4 mm across and 4 mm deep, 6 mm off centre. Drill a 20 mm handle eye 6 through the middle in a V-block.

Vifaa kwa hatua hii:

Ufito mviringo wa chuma lainiUfito mviringo wa chuma laini1 kipande
Mafuta ya kukatiaMafuta ya kukatia1 kipande

Zana zinazohitajika:

Kereza ya ChumaKereza ya Chuma
Chaki ya kereza yenye makucha 3Chaki ya kereza yenye makucha 3
Chombo cha kukata cha latheChombo cha kukata cha lathe
Patasi ya kukata kaziPatasi ya kukata kazi
Seti ya kukata nyuzi za skrubuSeti ya kukata nyuzi za skrubu
Mpini wa kukata nyuzi za njeMpini wa kukata nyuzi za nje
Kibano cha meza ya kaziKibano cha meza ya kazi
Kekee cha NguzoKekee cha Nguzo
Kitalu cha VKitalu cha V
Seti ya vichimbuziSeti ya vichimbuzi
Kigwe cha KatikatiKigwe cha Katikati
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
Miwani ya usalamaMiwani ya usalama
4

Turn the sockets 14

From 48 mm bar turn two sockets 30 mm long. Knurl the outside 25. Drill and tap the collar end 18 M20, 8 mm deep. From the other end, before boring, drill four 4 mm holes 20 mm deep centred on a 38 mm circle, for the grooves 24. Bore the aperture 16 38 mm across and 20 mm deep, leaving a rib 22 4 mm wide 10 mm in, turned to 35 mm with 30 degree ramps either side.

Vifaa kwa hatua hii:

Ufito mviringo wa chuma lainiUfito mviringo wa chuma laini2 vipande
Mafuta ya kukatiaMafuta ya kukatia1 kipande

Zana zinazohitajika:

Kereza ya ChumaKereza ya Chuma
Chaki ya kereza yenye makucha 3Chaki ya kereza yenye makucha 3
Chombo cha kukata cha latheChombo cha kukata cha lathe
Fimbo ya kukata ndaniFimbo ya kukata ndani
Patasi ya kukata kaziPatasi ya kukata kazi
Zana ya kuchora mikwaruzoZana ya kuchora mikwaruzo
Kekee cha NguzoKekee cha Nguzo
Seti ya vichimbuziSeti ya vichimbuzi
Seti ya kukata nyuzi za skrubuSeti ya kukata nyuzi za skrubu
Mpini wa kukata nyuzi za ndaniMpini wa kukata nyuzi za ndani
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
5

Make the tips 26

For each tip, cut nine discs of 4 mm natural rubber sheet 40 mm across and bond them into a stack with contact cement; clamp it overnight. Grind it round to 38.5 mm on the belt sander, then dome both ends: a large curve over most of the face and a small round where it meets the side, the same at both ends, 36 mm long overall.

Vifaa kwa hatua hii:

Bati la mpira asiliaBati la mpira asilia1 kipande
Gundi ya mgusanoGundi ya mgusano1 kipande

Zana zinazohitajika:

DiraDira
Kisu cha kazi za mikonoKisu cha kazi za mikono
Kibano cha upauKibano cha upau
Msagaji wa mkandaMsagaji wa mkanda
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
6

Assemble

Turn an ash handle to drive into the eye and wedge it. Screw a socket onto each boss hand-tight. Push a tip into each socket, squeezing it past the rib in the vice between soft packing, until its inner dome bears on the boss. Give the first few blows on a wood block: the rubber pushes into the boss's recess and locks the socket. To turn a tip round, pull it out, reverse it and push it back.

Vifaa kwa hatua hii:

Ubao wa Mti MgumuUbao wa Mti Mgumu1 kipande
Gundi ya MbaoGundi ya Mbao1 kipande

Zana zinazohitajika:

Kerezo cha mbaoKerezo cha mbao
Seti ya zana za lathe (HSS)Seti ya zana za lathe (HSS)
Msumeno wa chumaMsumeno wa chuma
Nyundo yenye kichwa cha duaraNyundo yenye kichwa cha duara
Kibano cha meza ya kaziKibano cha meza ya kazi
7

Troubleshooting

Reversible-tip hammer troubleshooting.

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8

History and honest limits

**Robert F. West** of Simsbury and **Walter H. Robinson** of West Hartford, Connecticut, assignors to The Stanley Works, US 3,040,792, dated 26 June 1962, filed 31 August 1960. They claimed sockets with an internal portion of reduced cross-section whose surfaces are "inclined to provide ramp surfaces", and symmetrical tips "having end surfaces of convexly curvilinear configuration", removable and "reversible in said sleeves". They list natural rubber, synthetic rubbers, nylon and cellulose esters for the tips; ours are laminated natural rubber. They give proportions but no sizes; every size here is ours.

Vifaa

6

Zana Zinazohitajika

24

Mchoro huu unatengeneza

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Threaded-Stud Rubber-Head Hammer: Heads Screw Onto the Body's Own Studs and Lock the Handle's Nail In (Dicks, 1951)

Threaded-Stud Rubber-Head Hammer: Heads Screw Onto the Body's Own Studs and Lock the Handle's Nail In (Dicks, 1951)

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Screw-On Rubber Head Mallet: Rubber Members on Flanged Ferrules, Cupped and Cushioned on Steel Studs (Pemmerl, 1950)

Screw-On Rubber Head Mallet: Rubber Members on Flanged Ferrules, Cupped and Cushioned on Steel Studs (Pemmerl, 1950)

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