Strap cutter for leather and like material |
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| 申请号 | US36832273 | 申请日 | 1973-06-08 | 公开(公告)号 | US3831279A | 公开(公告)日 | 1974-08-27 |
| 申请人 | BURNS B; | 发明人 | BURNS B; | ||||
| 摘要 | A tool for cutting a strap from the edge margin of a piece of leather or like material. Two rigid bars that are supported in spaced apart relation by a cutting blade at one end and an adjustable spacer at the other end. Blade clamps on each bar support both ends of the blade. A handle having an opening in which the bars are clamped and a guide surface to engage the edge of the leather sheet. The handle has a releasable clamp to permit adjustment of the distance between the blade and the guide surface. The opening in the handle is sufficiently large that angular adjustment of the blade relative to the guide surface is possible. | ||||||
| 权利要求 | 1. Apparatus for cutting straps from the edge margin of a sheet of flexible material comprising first and second rigid elongate bars, a cutting blade mounted adjacent a first end of said bars and extending between said bars, said bars having means for supporting said blade in spanning relation of said bars, said blade in cooperation with said supporting means acting to space said bars from one another at said first end, said bars each having a second end opposite respective said first ends, means for spacing the second ends of said bars from one another so that said bars are mutually parallel and define a material guiding slot therebetween, and a handle mounted on said bars and having means for affording adjustment of said handle longitudinally of said bars toward and away from said blade, said handle having a surface generally transverse of said bars to form a gauge surface spaced from said blade. 2. Apparatus according to claim 1 wherein said second ends spacing means comprises a compression spring member intermediate said bars, said compression spring member and said bars adjacent the second ends having holes therethrough, and a threaded member disposed in last said holes for adjustably compressively loading said compression spring member. 3. Apparatus according to claim 1 wherein said blade supporting means comprises a pair of confronting surfaces for defining a slot in each said bar adjacent the first end thereof, said slot having a width corresponding to the thickness of the blade, and means for drawing said confronting surfaces toward one another to frictionally engage the blade. 4. Apparatus according to claim 3 wherein said slot is disposed at an angle of about 2* with respect to said gauge surface, the extremity of said slot that corresponds to the cutting edge of said blade being more remote from said gauge surface than the opposite extremity of said slot. 5. Apparatus according to claim 3 wherein said drawing means comprises a threaded member having an inner portion threaded into said bar inward of said slot, a mid-portion extending through said slot, and an outer portion extending through said bar outward of said slot to the first end of the bar, the bar outward of said slot having a clearance hole for said threaded member, and a nut threadedly engaged on said threaded member for bearing against the first end of the respective bar so that said confronting surfaces are drawn together in response to tightening said nut. 6. Apparatus according to claim 5 wherein said threaded members reside at an Angle to the longitudinal axis of said bars so that said nuts are exterior of the planes of said bars that define the material guiding slot. 7. Apparatus according to claim 1 wherein said handle includes a rigid elongate body defining a rectangular opening that extends transversely thereof, said opening being of sufficient size to admit said bars therethrough, said opening being bounded by a bearing surface, a clamping plate disposed in said opening, and means for moving said clamping plate toward and away from said bearing surface to engage and disengage said bars between said bearing surface and said clamping means. 8. Apparatus according to claim 7 wherein said clamping plate moving means comprises a portion of said rigid body opposite said bearing surface defining a threaded bore, the axis of said bore being substantially normal to said bearing surface, and a threaded member engaged in said threaded bore and having an inner end for engagement with said clamping plate and an outer end exterior of said rigid body, said outer end having means affording a finger grip on said threaded member for turning said threaded member to move said clamping plate toward and away from said bearing surface. 9. Apparatus according to claim 7 wherein said clamping plate includes an abutment projecting toward said bearing surface by an amount less than the width of said bars, said abutment being spaced from an edge of said clamping plate by a distance corresponding to the thickness of said bar so that said first bar is constrained within one transverse boundary of said rectangular opening. 10. Apparatus according to claim 7 wherein said rectangular opening has a dimension longitudinally of said rigid body sufficient that a spacer shim can be inserted intermediate said bars and one side of said bearing surface to position said blade at a range of angles relative said gauge surface. 11. Apparatus according to claim 7 wherein said body is excised at the intersection between the gauge surface and the surface of said opening opposite said bearing surface so that said intersection is below said gauge surface. 12. Apparatus according to claim 7 wherein said rigid body includes a hand grip portion longitudinally spaced from said opening, a lateral region of said hand grip portion being coplanar with and in longitudinal alignment with said gauge surface, said handle portion having a maximum dimension in a direction parallel to the plane of said lateral region sufficient that frictional contact between the hand of the user and the handle portion can be had without obstructing said lateral region. 13. Apparatus according to claim 12 wherein said maximum dimension is at least about 1 1/2 inches. |
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