Safety belt clamping device

Claim 2

A vehicle safety belt retractor, comprising: a. a housing; b. a winding drum being rotatably mounted on said housing; c. belt means attached to said winding drum for protraction and retraction with respect thereto; d. clamp means for clamping said belt to prevent sudden protraction thereof, said clamp means including: (i) a first fixed planar clamping surface; (ii) a lever pivotally mounted at one end thereof; and (iii) a second displaceable planar clamping surface carried by the intermediate portion of said lever for movement from a rest position toward said fixed clamping surface to clamp the belt therebetween; e. resilient means coupled to said lever for biasing said lever for movement about its pivot in a direction to urge the second clamping surface carried by said lever away from said first clamping surface; f. first guide means mounted adjacent said one end of said lever for guiding said belt means; g. second, displaceable, guide means carried by the other end of said lever for entrainment of said belt means thereabout, and operating in response to preselected abnormal tension of said belt to pivot said lever and thereby move said second clamping surface toward said first clamping surface; said belt means normally extending off said winding drum to said first guide means, past said pivot, thence between said clamping surfaces without contact therewith and thence over said second guide means whereby in normal operation the retractor allows always free winding and unwinding of the belt between said clamping surfaces without contact therewith, but where a predetermined abnormal tension on the belt applies a force to said lever via the second guide means to actuate said lever into its clamping position against the bias of said resilient means in a substantially normal direction with no wedging action, said planar clamping surfaces being substantially parallel to the plane of the web at the point of contact therewith.

Claim 3

Apparatus according to claim 1 wherein at least one of said clamping surfaces is pivotally mounted.

Claim 4

A vehicle safety belt retractor, comprising: a. a housing; b. a winding drum being rotatably mounted on said housing; c. belt means attached to said winding drum for protraction and retraction with respect thereto; d. clamp means for clamping said belt to prevent sudden protraction thereof, said clamp means including (i) a first fixed planar clamping surface carried by said housing; (ii) a lever pivotally mounted at one end thereof on said housing; and (iii) a second displaceable planar clamping surface carried by the intermediate portion of said lever for movement from a rest position toward said fixed clamping surface to clamp the belt therebetween; e. resilient means coupled to said lever for biasing said lever for movement about its pivot in a direction to move the second clamping surface carried by said lever away from said first clamping surface; f. first guide means carried by said housing for guiding said belt means; g. second, displaceable, guide means carried by the other end of said lever for entrainment of said belt means thereabout, and operating in response to preselected abnormal tension of said belt to pivot said lever and thereby move said second clamping surface toward said first clamping surface; said belt means normally extending off said winding drum to said first guide means, past said pivot thence between said clamping surfaces without contacting same and thence over said second guide means whereby in normal operation the retractor allows always free winding and unwinding of the belt between said clamping surfaces without contact therewith, but where a predetermined abnormal tension on the belt applies a force substantially perpendicular to said lever to actuate said lever into its clamping position against the bias of said resilient means in a substantially normal direction with no wedging action, said planar clamping surfaces being substantially parallel to the plane of the web at the point of contact therewith; said belt in its operative condition extending away fronm said second guide means in a direction substantially perpendicular to its path as it approaches said guide means.

Claim 5

A vehicle safety belt retractor, comprising: a. a housing; b. a winding drum being rotatably mounted on said housing; c. belt means attached to said winding drum for protraction and retraction with respect thereto; d. clamp means for clamping said belt to prevent sudden protraction thereof, said clamp means including (i) a first fixed planar clamping surface carried by said housing; (ii) a lever pivotally mounted at one end thereof on said housing; and (iii) a second displaceable planar clamping surface carried by the intermediate portion of said lever for movement from a rest position toward said fixed clamping surface to clamp the belt therebetween; e. resilient means coupled to said lever for biasing said lever for movement about its pivot in a direction to move the second clamping surface carried by said lever away from said first clamping surface; f. first guide means carried by said housing for guiding said belt means; g. second, displaceable, guide means carried by the other end of said lever for entrainment of said belt means thereabout, and operating in response to preselected abnormal tension of said belt to pivot said lever and thereby move said second clamping surface toward said first clamping surface; said belt means normally extending off said winding drum to said first guide means, past said pivot thence between said clamping surfaces without contacting same and thence over said second guide means whereby in normal operation the retractor allows always free winding and unwinding of the belt between said clamping surfaces without contact therewith, but where a predetermined abnormal tension on the belt applies a force substantially perpendicular to said lever to actuate said lever into its clamping position against the bias of said resilient means in a substantially normal direction with no wedging action, said planar clamping surfaces being substantially parallel to the plane of the web at the point of contact therewith; said belt in its operative condition extending away fronm said second guide means in a direction substantially perpendicular to its path as it approaches said guide means.

Claim 6

Apparatus according to claim 3 wherein said clamping surfaces are both pivotally mounted.