Keilim 22:4 - 22:5

שניטלו חפויט (that its seat boards/coverings were removed) – it is the language of covering that opens, like a kind of teeth that extend outward from all sides of the chair of the bride, and are made in order to support them.

בית שמאי מטמאין – for they are still fit for sitting.

ובית הלל מטהרין – for they are not fit for the bride, for it is like it is broken.

אף מלבן הכסא טמא – meaning to say, that even the frame of the chair on its own, without the seat and without its cover is impure, all the more so that he chair without its covering is impure. The frame, is the form of square brick they make on the chair and they sit upon it.

כסא שקבעו בעריבה (a chair that one affixed to a trough) – they brought a chair from another place and affixed it in a trough in the manner of his sitting. But the trough is not impure through treading. For it is appropriate for kneading.

בית שמאי מטמאין – for it did not annul the seat concerning the trough.

ובית הלל מטהרין – [makes it pure] from [impurity through] treading, for the seat is nullified concerning the trough. But concerning a seat made in the trough itself, the School of Shammai agrees with the School of Hillel that it is pure.

ושמאי אומר – even the sea that is made inside the trough itself is impure through treading.

כסא שלא היו חפויו יוצאין – that the boards/planks do not protrude outside of the chair. That the chair is made from four [pieces of] wood and planks fixed from three directions of the chair stands high under the wood that is fastened with each other, and from above the wood, tablets are made to sit upon them. But if the tablets are broken that are made for sitting, one can tip the chair to each side that one wishes and to sit upon those boards that are affixed from the three sides of the chair, but when they protrude outward, he is not able to tip it on its side. And the covers/seat boards mentioned here are not like the covers/seat boards mentioned in the first part of the Mishnah, for they are like protruding teeth, but rather for the boards that cover the wood are called חפויו/upholstered seat.