Rif Eruvin 34a {Eruvin 101a continues ... 102a}

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34a

{Eruvin 101a continues}
Mishna:
A person may not stand in the private domain and open {a door lock} to in the public domain, or in the public domain and open to in the private domain, unless he made a partition ten handbreadths high. These are the words of Rabbi Meir.
They said to him: It once happened in the market of פטמין in Jerusalem, that they used to lock up and place the key in the window above the door.
Rabbi Yossi says: It was a wool-dealers' market.

Gemara:
The market of פטמין is a market of fowl-sellers, as we say in Yom Tov {Betza 29b}: He goes to his regular פטם and says: give me one turtledove or one young pigeon.

{Eruvin 101b}
The Sages learnt {in a brayta}: The doors of garden gateways, when they have a gatehouse on the inner side, they may be opened and closed from within; when on the outside, they may be opened and closed from without. On both this side and that, they may be opened on both this side and that. If they do not have one, neither on this side nor that, they may not be opened, neither on this side nor that. And so too shops that open into a public domain. When the lock is below 10 handbreadths, he brings a key on erev Shabbat and places it on the threshold. The next day {=Shabbat} he opens and closed with it, and he returns it to the threshold. When the lock is above 10 handbreadths, he brings a key on erev Shabbat and places it in the lock. The next day, he opens and closes with it and returns it to its place {on top of the lock which is also a private domain}. These are the words of Rabbi Meir. And the Sages say: Even when the lock is above 10 handbreadths, he brings a key on erev Shabbat and places it on the threshold, and the next day, he opens and closes with it and returns it to the threshold or on a window above the door. But if the window is 4 X 4 {handbreadths} it is forbidden, for he is transfering from domain to domain.

This lock, how so? If it is not 4 X 4 {handbreadths} it is a mekom petur {place of exemption}. And if it has 4 x 4 {handbreadths}, in this would the Sages say that even when the lock is higher than ten {handbreadths} he may open and close and return it to the threshold?! He would be moving from a karmelit to a public domain!
Abaye said: In truth, it does not have 4 x 4 {handbreadths}, but there is enough space in it {=the door} to carve and complete it to 4. Rabbi Meir maintains that we carve {or regard it as carved} to complete, and the Sages hold that we do not carve to complete.

Mishna:
A bolt which has a knob on its top - Rabbi Eliezer forbids, but Rabbi Yossi permits.
Rabbi Eliezer said: It once happened in a synagogue in Tiberias that they treated it as permitted, until Rabban Gamliel and the Elders came and forbade them.
Rabbi Yose says: They treated it as prohibited and they {=Rabban Gamliel and the Elders} came and permitted them.

Gemara:
Where it can be lifted up by its binding {=the cord to which it was fastened to the door} all do not dispute that it is permitted. When do they argue? {Eruvin 102a} When it cannot be lifted by its binding.