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Snap-in attachment for ear defender cup
| Details |
Inventors: Nordin, Henrik; Nilsson, Sigvard;
Assignee: Peltor Aktienbolag (Varnamo, SE)
Primary Examiner: Kuntz; Curtis
Assistant Examiner: Tran; Sinh
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen
A snap-in attachment of a headband or other support means for a hearing-protection cup is described. The snap-in contact comprises a sliding pin (6) the journal section (7) of which is oval or elliptical in cross section, and a jaw element with two resiliently deformable jaws (11, 12). The inner walls (21, 22) of the jaws (11, 12) and the wall section (20) connecting them define a locking space (13). The journal section (7) of the sliding pin can be inserted into the locking space (13) against a resilient counter member only in the direction of the longitudinal axis of the journal section (7) and is thus lockable between the jaws (11, 12) in a first locked position. After being turned (angle .alpha.) against another resilient counter member, the sliding pin is locked by its journal section (7) in the locking space (13) in a second locked position, in which it is pivotable to a limited extent (sector with angle .beta.). |
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DETAILED DESCRIPTION According to the present invention a detachable snap-in attachment is defined in which the sliding pins have double mirror-image symmetry in a plane perpendicular to their axes of rotation, the sliding pins being preferably oval or elliptical in their journal section and, to effect attachment, are able to be inserted into the gap between the jaws only in the direction of the longitudinal axes of the journal section.
It is preferred that when in place the sliding pins are freely pivotable in relation to the headband within a sector where the sector angle .
beta.
is between approximately 20.
degree.
and approximately 80.
degree.
, preferably approximately 55.
degree.
.
It is also preferred that when in place the sliding pins are freely pivotable in relation to the headband within an angular range, relative to the direction of insertion of the sliding pin in the gap between the jaws, of from between approximately 50.
degree.
and approximately 130.
degree.
to between approximately 80.
degree.
and approximately 100.
degree.
, preferably between approximately 62.
5.
degree.
and 107.
5.
degree.
.
When in place the sliding pins are preferably lockable in the jaws either in or against the direction of insertion.
According to a preferred aspect of the invention the eccentricity, i.
e.
the ratio between the length of the short axis of the journal section and its longitudinal axis, is between approximately 1:1.
3 and approximately 1:5, preferably approximately 1:2.
According to another preferred aspect of the invention the inner walls of the gap and the jaws, and the wall section connecting the inner walls of the jaws define a locking space, the length of the longitudinal axis of the oval or ellipse defining the sliding pin being equal to or negligibly smaller than the diameter of a circle defining the curvature of the first wall section of the inner wall of the locking space which, calculated from the direction of insertion of the sliding pin, extends at a positive or negative angle from at most between approximately 40
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