Buckles – buttons – clasps – etc. – Separable-fastener or required component thereof – Including member having distinct formations and mating...
Patent
1998-10-23
1999-09-28
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Separable-fastener or required component thereof
Including member having distinct formations and mating...
24590, 24663, A44B 1700, F16B 3700
Patent
active
059568224
DESCRIPTION:
BRIEF SUMMARY
Two parts which can be latched to one another The invention relates to two parts which can be latched to one another and, in the latched state, can be rotated with respect to one another.
EP, which was not published before the priority date of this application, 0 723 796 A1 describes a device in which of the two parts, supporting the latching hooks in the axial direction, aligned concentrically with respect to the arrangement of the latching hooks, against being inadvertently released from their latched-in position, elastically deformable in the radial direction and latching hook abutment surface of the annular flank is smaller than the radial width of the latching hooks.
This problem is solved by a design comprising two parts which can be latched to one another and, in the latched state, can be rotated with respect to one another, having all the features of Patent claim 3.
The invention is based on the idea of designing as, in theory, a free-floating ring those material regions which are to open out upon closure of the latching connection, the smallest possible number of thin webs attaching each ring axially to one of the two parts which are to be connected.
A particularly advantageous embodiment forms the subject matter of claim 4.
An exemplary embodiment is illustrated in the drawing, in which:
FIG. 1 shows a longitudinal section through one end of a tubular frame for receiving an annular filter element in a releasable manner,
FIG. 2 shows a longitudinal section through a cover of a filter housing with latching hooks for the releasable connection to the tubular frame according to FIG. 1,
FIG. 3 shows a plan view of the cover according to FIG. 2, and
FIG. 4 shows a plan view of that end of the tubular frame of a filter element which is illustrated in FIG. 1.
The exemplary embodiment illustrated relates to a latching connection between a screw-action cover 1 of a liquid filter and a tubular frame 2 onto which an annular filter element can be pushed in a releasable manner, it being possible for said two parts of the latching connection to be rotated with respect to one another.
Axially projecting, radially resilient latching hooks 3 are provided, in an annular arrangement, in the closed base of the screw-action cover. These latching hooks 3 can be snapped into a receiving device provided on the tubular frame 2.
The receiving device on the tubular frame 1 (sic) comprises a continuous, radially inner annular collar 4 with an annular flank 5 as axial stop surface for the latching hooks 3.
A fixing ring 6 is provided, coaxially with the annular collar 4, on the tubular frame 2 and is connected to the latter via individual axial webs 7 which are distributed over the circumference.
The width of the annular gap 8 between the fixing ring 6 and the annular collar 4 is smaller than the radial width of the latching hooks 3 at the latching end of the latter. When the latching connection is brought into engagement, the latching hooks 3 thus open out the annular gap locally in each case until the latching hooks 3 can engage in their latched-in position. The annular gap 7 (sic) is caused to open out locally around the circumference primarily by the fixing ring 6 opening out elastically in the radial direction in the circumferential regions upon which the latching hooks 3 act in each case. Since the fixing ring is connected to the basic body of the tubular frame 2 simply via a small number of individual, relatively thin axial webs 7, the necessary opening-out action takes place relatively easily, even if the fixing ring 3 (sic) is made of a relatively rigid material, by virtue of elastic deformation of the fixing ring 6. For the opening-out action, the fixing ring 6 can deform in a non-circular manner by those regions which the latching hooks 3 act upon directly yielding radially outwards to a further extent than the regions between these locations, which regions can contract radially inwards.
The inventive design of the receiving device provided for receiving the latching hooks 3 on the tubular frame 2 is suitable, in a
REFERENCES:
patent: 1265719 (1918-05-01), Anderson
patent: 4400856 (1983-08-01), Tseng
patent: 4728236 (1988-03-01), Kraus
patent: 4859129 (1989-08-01), Kraus
patent: 4985968 (1991-01-01), Hooper
Brieden Thomas
Mohle Rolf
Sarwar Abdul-Bashir
Knecht Filterwerke GmbH
Sakran Victor N.
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