Rideless scissors with an adjustable load transverse to the pivot axis on a pivot joint

• US 5,440,813 A
• Filed: 06/04/1993
• Issued: 08/15/1995
• Est. Priority Date: 06/04/1993
• Status: Expired due to Fees

• Current Assignee: Maksor, LLC
• Original Assignee: Maksor, LLC
• Inventors: Roskam, Scott H.
• Primary Examiner(s): Rada, Rinaldi I.
• Assistant Examiner(s): Dexter, Clark F.
• Application Number:
  US08/071,781
• Time in Patent Office: 802 Days
• Field of Search: 30/254, 30/266-271, 30/260, 76/106.5, 81/416, 16/273, 16/275, 29/434, 29/525.1
• US Class Current: 30/254
• CPC Class Codes: B26B 13/285 with means for applying pressure on the blades; with means for producing "drawing-cut" effect
• CPC Class Codes: Y10T 29/4984 Retaining clearance for motion between assembled parts

Abstract

An improved scissors includes a pivot joint having a pivot axis, a first blade member having a first cutting edge and a longitudinal axis, and a second blade member having a second cutting edge. The second blade member is pivotally coupled by the pivot joint to the first blade member with the first cutting edge adjacent and in contact with the second cutting edge. Moreover, the pivot joint is coupled to the first blade member to incline the first blade member relative to the second blade member and the pivot joint, so that the inclination of the first blade member produces a load transverse to the pivot axis of the pivot joint, which corresponds to the direction along the longitudinal axis of the first blade member to produce and determine the tension and friction along the cutting edges. The load transverse to the pivot axis may be oblique to the pivot axis of the pivot joint and may also be inclined between 0.1 to 10.0 degrees from an axis perpendicular to the pivot axis and along the longitudinal axis of the first blade member. Further, the first blade member may also include a first ride area, and the second blade member may also include a second ride area, so that the first ride area is spaced from and free of contact with the second ride area. Therefore, the scissors may be substantially free of any friction or drag at the "ride" area.

Claims

1. A scissors comprising:

a pivot joint including a substantially frictionless sealed bearing assembly, said pivot joint having a pivot axis and a diameter;

a securing member;

a first blade member having a first cutting edge and a longitudinal axis, the first blade member further having a pivot joint hole defined therein, the pivot joint hole being oversized with respect to the diameter of the pivot joint in a direction along the longitudinal axis of the first blade member, and the securing member being coupled to the first blade member and contacting a portion of the pivot joint; and

a second blade member having a second cutting edge, the second blade member being pivotally coupled by the pivot joint to the first blade member with the first cutting edge adjacent to the second cutting edge, the pivot joint being coupled to the first blade member through the pivot joint hole in the first blade member, the pivot joint being secured in the pivot joint hole by the securing member in an inclined orientation relative to the first blade member in the direction along the longitudinal axis of the first blade member, the inclined orientation of the pivot joint maintained by the securing member causing the first blade member to incline relative to the second blade member and the pivot joint, wherein inclining the first blade member relative to the pivot joint and the second blade member produces a load transverse to the pivot axis of the pivot joint corresponding to the direction along the longitudinal axis of the first blade member, wherein the load transverse to the pivot axis inclines and forces the first cutting edge into contact with the second cutting edge to produce tension and friction between the first and second cutting edges; and

wherein the first blade member further includes a first ride area on a side of the pivot joint opposite the first cutting edge of the first blade member, and wherein the second blade member further includes a second ride area on a side of the pivot joint opposite the second cutting edge of the second blade member such that when the first blade member is pivotally coupled to the second blade member the first ride area and the second ride area are on the same side of the pivot joint, and wherein the inclined orientation of the pivot joint with respect to the first blade member maintained by the securing member causes the first ride area to separate away from contact with the second ride area such that the first ride area is spaced apart from and free of contact with the second ride area.

2. A scissors comprising:

a pivot joint having a pivot axis and a diameter;

a securing member;

a first blade member having a first cutting edge and a longitudinal axis, the first blade member further having a pivot joint hole defined herein, the pivot joint hole being oversized with respect to the diameter of the pivot joint in a direction along the longitudinal axis of the first blade member, and the securing member being coupled to the first blade member and contacting a portion of the pivot joint; and

a second blade member having a second cutting edge, the second blade member being pivotally coupled by the pivot joint to the first blade member with the first cutting edge adjacent to the second cutting edge, the pivot joint being coupled to the first blade member through the pivot joint hole in the first blade member, the pivot joint being secured in the pivot joint hole by the securing member in an inclined orientation relative to the first blade member in the direction along the longitudinal axis of the first blade member, the inclined orientation of the pivot joint maintained by the securing member causing the first blade member to incline relative to the second blade member and the pivot joint, wherein inclining the first blade member relative to the pivot joint and the second blade member produces a load transverse to the pivot axis of the pivot joint corresponding to the direction along the longitudinal axis of the first blade member, wherein the load transverse to the pivot axis inclines and forces the first cutting edge in contact with the second cutting edge to produce tension and friction between the first and second cutting edges;

wherein the securing member is coupled to the first blade member that engages a portion of the pivot joint to increase and decrease the inclined orientation of the pivot joint to adjust the load transverse to the pivot axis and the tension and friction between the cutting edges; and

wherein the first blade member further includes a first ride area on a side of the pivot joint opposite the first cutting edge of the first blade member, and wherein the second blade member further includes a second ride area on a side of the pivot joint opposite the second cutting edge of the second blade member such that when the first blade member is pivotally coupled to the second blade member the first ride area and the second ride area are on the same side of the pivot joint, and wherein the inclined orientation of the pivot joint maintained by the securing member causes the first ride to separate area away from contact with the second ride area such that the first ride area is spaced apart from and free of contact with the second ride area.

3. The scissors according to claim 2, wherein the second blade member has a pivot joint hole, wherein the pivot joint passes through the pivot joint hole in each blade member, and wherein the securing member adjusts the inclined orientation of the pivot joint in the oversized pivot joint hole to set various loads transverse to the pivot axis that increase and decrease the tension and friction between the cutting edges.

4. The scissors according to claim 3, wherein the pivot joint includes a substantially frictionless sealed bearing assembly, a washer, and a pivot pin having a flanged head and a threaded end, wherein the pivot joint hole in the second blade member is threaded, wherein the pivot pin passes through the bearing assembly and the washer, and has the threaded end of the pivot pin secured in the threaded pivot joint hole in the second blade member, and wherein the bearing assembly is held in the oversized pivot joint hole of the first blade member between the head of the pivot pin and the washer.

5. The scissors according to claim 4, wherein the bearing assembly has an outer flange, and wherein the securing member engages the outer flange to incline the first blade member with respect to the pivot joint and the second blade member.

6. The scissors according to claim 3, wherein the securing member further includes a tension lever with two threaded bores, and the pivot joint includes a substantially frictionless sealed bearing assembly, a washer, and a pivot pin having a flanged head and a threaded end, wherein the pivot pin passes through the bearing assembly, the washer, the oversized pivot joint hole in the first blade member and the threaded end of the pivot pin is secured in one of the threaded bores in the tension lever, wherein the bearing assembly is held in the pivot joint hole of the second blade member between the head of the pivot pin and the washer, and wherein an adjustment member of the securing member is threaded into the other threaded bore of the tension lever and contacts the first blade member to adjust the inclined orientation of the pivot joint to change the incline of the first blade member with respect to the pivot joint and the second blade member.

7. A method of manufacturing scissors, comprising the steps of:

providing a pivot joint with a pivot axis and a diameter;

providing a securing member;

providing a first blade member having a first cutting edge and a longitudinal axis, further providing the first blade member with a pivot joint bore defined therein;

oversizing the pivot joint bore with respect to the diameter of the pivot joint in a direction along the longitudinal axis of the first blade member;

inserting the pivot joint in the pivot joint bore of the first blade member;

coupling the securing member to the first blade member;

contacting a portion of the pivot joint with the securing member;

providing a second blade member having a second cutting edge;

pivotally coupling the second blade member to the first blade member through the pivot joint with the first cutting edge adjacent to the second cutting edge;

inclining the pivot joint in an inclined orientation within the pivot joint bore, the inclined orientation of the pivot joint inclining the first blade member relative to the second blade member and the pivot joint;

securing and maintaining the inclined orientation of the pivot joint with the securing member;

wherein the first cutting edge is inclined into contact with the second cutting edge with a load transverse to the pivot axis being produced from the inclination of the first blade member relative to the second blade member and the pivot joint in a direction along the longitudinal axis of the first blade member to produce tension and friction between the first and second cutting edges;

further providing the first blade member with a first ride area on a side of the pivot joint opposite the first cutting edge of the first blade member;

further providing the second blade member with a second ride area on a side of the pivot joint opposite the second cutting edge of the second blade member such that when the first blade member is pivotally coupled to the second blade member the first ride area and the second ride area are on the same side of the pivot joint;

wherein the first ride area separates away from contact with the second ride area when the inclined orientation of the pivot joint secured and maintained by the securing member causes the first blade member to be inclined relative to the second blade member and the pivot joint such that the first ride area is spaced apart from and free of contact with the second ride area;

adjusting a contact force between the securing member and the pivot joint to adjust the inclined orientation of the pivot joint to adjust the load transverse to the pivot axis and the inclination of the first blade member to adjust the tension and friction between the blade members.

8. The method according to claim 7, wherein the step of pivotally coupling the second blade member to the first blade member further comprises:

providing the second blade member with a pivot joint bore; and

passing the pivot joint through the pivot joint bore in each blade member.

9. The method according to claim 8, wherein the step of pivotally coupling the second blade member to the first blade member further comprises:

threading the pivot joint bore in the second blade member;

forming the pivot joint with a substantially frictionless sealed bearing assembly, a washer, and a pivot pin having a flanged head and a threaded end;

passing the pivot pin through the bearing assembly and the washer; and

threading the pivot pin into the threaded pivot joint bore in the second blade member;

wherein the bearing assembly is secured in the oversized pivot joint bore of the first blade member by the securing member.

10. The method according to claim 9, further comprising the steps of:

forming an outer flange on the bearing assembly;

said contacting step being performed by engaging the outer flange with the securing member to incline

the first blade member with respect to the pivot joint and the second blade member to produce the load transverse to the pivot axis.

11. The method according to claim 8, further comprising the steps of:

providing the securing member with a tension lever having two threaded bores;

forming the pivot joint with a substantially frictionless sealed bearing assembly, a washer, and a pivot pin having a flanged head and a threaded end;

passing the pivot pin through the bearing assembly, the washer and the oversized pivot joint bore in the first blade member;

securing the threaded end of the pivot pin in one of the threaded bores in the tension lever;

p1 securing the bearing assembly in the pivot joint bore of the second blade member by the washer and the flanged head of the pivot pin; and

threading an adjustment member into the other threaded bore of the tension lever and contacting the first blade member to adjust the inclined orientation of the pivot joint to adjust the incline of the first blade member with respect to the pivot joint and the second blade member to produce a load transverse to the pivot axis.