[0001] The present invention relates to a door frame for bricking in, comprising two side
members and a doorhead member, the side members and the doorhead member being made
from sheet metal shaped to U-like form, the open sides of which members being directed
outwards, which members may be connected in the upper corners without mitre, in that
the adjacent ends of the members have been cut off or cut in complementary, whereby
one member is provided with one or more lips, fitting in one or more slots in the
other member, which lip or lips is or are bent or turned after connecting in order
to fix the connections and with locking slots extending perpendicularly to the longitudinal
direction of the member, in which locking slots the ends of the other member may be
taken up.
[0002] Such a door frame is known from US Patent 2,601,164. The members of this door frame
may be shipped in knock-down form and connected on the construction site in a rigid
form for installation.
[0003] At this known frame the lips are provided at the upper ends of the side members,
while the doorhead member contains the slots for these lips as well as the locking
slots. These locking slots are extending through the whole width of the legs and through
a part of the bottom of the doorhead member.
[0004] The present invention aims to improve this frame and this improvement is obtained
in that the legs of the U-like members are provided with turned in ends, so that channels
are formed facing inwards and in that the locking slots are only provided in the inner
walls of the channels of the member, which contains the slot or slots for the lips.
[0005] The legs of the members according to the invention are provided with channel-shaped
ends. These channel-shaped ends give a better connection with the surfaces of the
wall, in which the door frame is installed. The inner walls of these channels are
used for arranging the locking slots. Making these short locking slots in the inner
walls is much easier than making the long locking slots in the legs themselves. The
locking slots are moreover completely out of sight after assembly the frame.
[0006] The. invention will be explained now with reference to the drawing, in which:
fig. 1 shows perspectively the corner connection between the doorhead member and a
side member, whereby both members are shown apart from each other; and
fig. 2 is a side view of the corner connection according to fig. 1.
[0007] The doorhead member is indicated with 1 and the side member with 2. The doorhead
member as well as the side members are made of rolled metal sheet with a U-shaped
cross-section. The bottom of the channel is indicated with la resp. 2a and the legs
with lb resp. 2b.
[0008] The free ends of the legs of the members are turned in, so that channels are formed
facing inwards.
[0009] The bottom la of the doorhead member 1 is provided with an undercut lip 3. This lip
can be passed through a slot 4 in the bottom 2a of each side member 2, the sides of
the undercutting of each lip are preferably slightly tapering, so that the lip may
be turned more easily. After inserting the lip can be turned by tongs or the like,
so that the situation of fig.-2 is obtained.
[0010] This single lip-slot-connection 3,4 does not give a sufficient stiff corner connection.
For this reason in the innerwalls of the channels of the legs 2b of the side members
2, locking slots 5 are provided. After connecting the doorhead member 1 and the side
members 2 the ends of the bottom la are received in these slots 5. Owing to the stepped
form of the bottom la the locking slot 5 in one leg is higher located than in the
other leg.
[0011] In order to facilitate the mounting the sides of the locking slots are slightly tapering,
so that at mounting some kind of aligning occurs.
[0012] Owing to the combination of a single lip-slot-connection 3,4 and locking slots 5
a very stiff corner connection is obtained without welding or the like.
[0013] Since the corner connections are made without mitre the side members 2 must be somewhat
broader than the doorhead member 1, namely twice the sheet thickness. In this way
no gaps will be present.
[0014] As appears from fig. 1 the door frame is connected with the surrounding wall by means
of anchors 6 adapted for bricking in.
[0015] These anchors 6 are made of somewhat resilient metal wire. The ends of the anchors
6 are clamped against the innersides of the legs lb and 2b. In this way a very simple
connection of the anchors is obtained.
1. A door frame for bricking in, comprising two side members and a doorhead member,
the side members and the doorhead member being made from sheet metal shaped to U-like
form, the open sides of which members being directed outwards, which members may be
connected in the upper corners without mitre, in that the adjacent ends of the members
have been cut off or cut in complementary, whereby one member is provided with one
or more lips, fitting in one or more slots in the other member, which lip or lips
is or are bent or turned after connecting in order to fix the connections and with
locking slots extending perpendicularly to the longitudinal direction of the member,
in which locking slots the ends of the other member may be taken up, characterized
in that the legs of the U-like members are provided with turned in ends, so that channels
are formed facing inwards and in that the locking slots are only provided in the innerwalls
of the channels of the member, which contains the slot or slots for the lips.
2. A door frame according to claim 1, characterized in that the doorhead member contains
a lip on both ends, lying in the plane of the bottom of the U-like doorhead member
and in that each sidemember at the upper end is provide with a lip, lying in the plane
of the bototm of the sidemember, whereby the locking slots are provided in the sidemembers.
3. A door frame according to claim 1 or 2, characterized in that the lip or lips is
or are undercut, so that this lip or these lips after inserting in the slot or slots
may be fixed by turning.
4. A door frame according to claim 1, 2 or 3, characterized in that the sides of the
undercutitng of each lip is slightly tapering.
5. A door frame according to claim 1,2,3 or 4, characterized in that each locking
slot is provided with tapering sides.
6. Anchor adapted for the door frame according to one or more of the preceding claims,
characterized in that the anchor is formed as a resilient tong-shaped clamp, the ends
of which can engage the channels of the sidemembers or the doorhead member.