Kinetic energy absorber

• US 4,385,665 A
• Filed: 10/23/1980
• Issued: 05/31/1983
• Est. Priority Date: 10/23/1979
• Status: Expired due to Term

• Current Assignee: Fritz Knoll
• Original Assignee: Fritz Knoll
• Inventors: Knoll, Fritz
• Primary Examiner(s): Smith, James G.
• Assistant Examiner(s): Olszewski, Robert P.
• Application Number:
  US06/199,814
• Time in Patent Office: 950 Days
• Field of Search: 173/114, 173/116, 173/134, 173/139, 173/162 R, 173/DIG. 2, 181/207, 181/208, 267/137, 267/139, 267/140, 267/141, 267/141.2, 74/574, 188/378, 188/379, 92/143
• US Class Current: 173/162.1
• CPC Class Codes: B25D 17/24 Damping the reaction force resiliently mounted handles B25D17/043; dampers in connections of hammers to backhoes E02F3/966
• CPC Class Codes: B25D 2217/0092 being spring-mounted
• CPC Class Codes: F16F 7/108 on plastics springs
• CPC Class Codes: Y10S 173/02 Sound muffling

Abstract

A device for absorbing kinetic energy derived from an element oscillating in a direction parallel to a longitudinal axis of the device. The device has a housing coupled to the oscillating member and defining a chamber bounded by opposite inner end walls and an inner lateral wall of the housing. The inner end walls are generally transverse to and the inner lateral wall is generally parallel with the axis of the device. An oscillation quencher body which is situated in the chamber, has opposite end faces oriented towards respective inner end walls and a lateral face oriented towards the inner lateral wall. A resiliently deformable impact member is situated between each end face of the body and a respective inner end wall of the housing. Further, at least one groove is provided in the lateral face of the body. The groove has a length generally transverse to and a width generally parallel with the device axis. A compressible solid rolling body is received in the groove and engages the inner lateral wall of the housing.

Claims

1. A device for absorbing kinetic energy derived from an element oscillating in a direction parallel to a longitudinal axis of the device, comprising:

(a) a housing coupled to said element and defining a chamber bounded by opposite inner end walls and an inner lateral wall of said housing;

said inner end walls being generally transverse to and said inner lateral wall being generally parallel with said axis;

(b) an oscillation quencher body situated in said chamber spaced from said inner walls;

said body having opposite end faces oriented towards respective said inner end walls and a lateral face oriented towards said inner lateral wall;

(c) a resiliently deformable impact member situated between each said end face of said body and a respective said inner end wall of said housing;

each impact member being structured such that an exponential relationship exists between a deformation of the impact member and a resilient counterforce generated thereby by the deformation;

(d) means defining at least one groove having a base spaced from said inner lateral wall of said housing at a predetermined distance;

said base having a width generally parallel with said axis; and

(e) a compressible solid rolling body received in said groove and having a cross-sectional diameter;

said rolling body circumferentially engaging said base of said groove and said inner lateral wall of said housing;

further wherein said predetermined distance is less than said cross-sectional diameter, whereby said rolling body is in a cross-sectionally compressed state; and

further wherein said width of said base is greater than the dimension of the cross section of the compressed rolling body measured parallel to said axis, whereby a relative axial displacement between said housing and said quencher body effects a rolling displacement of said rolling body within and relative to said groove parallel to said axis.

2. A device as defined in claim 1, wherein said element oscillating in a predetermined direction is an elongated component whose length dimension coincides with said predetermined direction of oscillation;

further wherein said oscillation quencher body has an axial central throughgoing opening through which said elongated component passes with a clearance; and

further comprising bearing means in said housing for supporting said elongated component.

3. A device as defined in claim 1, wherein said inner lateral wall of said housing and said lateral face of said body are cylindrical and further wherein said rolling body is a rolling ring.

4. A device as defined in claim 1, wherein said rolling body engaging said inner lateral wall of said housing over an area having a length measured parallel to said width of said base;

said width of said base being more than twice the length of said area.

5. A device as defined in claim 4, wherein the compressed rolling body has a thickness diameter measured in a direction parallel with said width of said base;

said width of said base being 1.5 times said thickness diameter.

6. A device as defined in claim 3, wherein said rolling ring has a circular cross section.

7. A device as defined in claim 1, wherein each impact member is annular.

8. A device as defined in claim 1, wherein each impact member has a circular cross section.

9. A device as defined in claim 1, wherein each impact member has a quadrilateral cross section and further wherein the two diagonals of said quadrilateral cross section are parallel with and, respectively, perpendicular to said axis.

10. A device as defined in claim 1, wherein each impact member has a rectangular cross section having opposite long sides and opposite short sides;

said cross section further having an enlargement;

said long sides being oriented radially with respect to said axis.

11. A device as defined in claim 1, wherein said impact members are of polybutadiene.

12. A device as defined in claim 1, wherein said housing is a power tool housing and further wherein said housing has an outer surface constituting a manually engageable grasping face.

13. A device as defined in claim 1, wherein said rolling body is an elastic material.

14. A device as defined in claim 13, wherein said elastic material is an elastomer.

15. A device as defined in claim 1, wherein said groove is located in the lateral face of the quencher body.