US3757627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for cutting pins for producing chain links
Assignee: Wafios Maschinenfabrik Wagner Ficker and Schmid
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Filing: 1971-05-28
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Granted: 1973-09-11
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Expires: 1991-05-28
Abstract
Abstract The production of pins which subsequently are to be bent and welded to form chain links, in which each pin is cut off a rod by a pair of equal wedge-shaped blades which are simultaneously reciprocated in opposite directions to each other within a common central plane extending transverse to the axis of the rod, and which while cutting impress V-shaped notches into diametrically opposite sides of the rod so that the ends of each pin have an angular shape similar to a peaked roof. One preferred embodiment of the invention provides that, instead of forcing the two blades so deeply in the material that their cutting edges engage with each other and thus cut off each pin completely, the blades are impressed only for such a distance into the material that a thin connecting web-remains between the pin and the rod supply which web is then shorn off by moving the pin transversely relative to the rod.
Inventors
- 👤 G Lange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:13
CPC Classifications
B; B21; B21L; B21L3/00; B21L3/02; B23; B23D; B23D15/00; B23D15/02; B23D21/00; Y; Y10; Y10T; Y10T225/00; Y10T225/30; Y10T225/371; Y10T83/00; Y10T83/04; Y10T83/0581; Y10T83/869; Y10T83/8737; Y10T83/874; Y10T83/8798; Y10T83/8802
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
273 words
An apparatus for producing pins with wedge-shaped ends for subsequently producing chain links therefrom, comprising a pair of notching blades each having a substantially V-shaped crosssection with an apex facing that of the other blade, and means for slidably mounting said blades and for reciprocating them in opposite directions to each other within a common plane extending transverse to the axis of a rod from which a pin is to be cut by said blades so that each blade is impressed into said rod substantially up to the longitudinal axis of said rod and a section is cut off said rod to form one of said pins when both blades reach said axis of said rod the adjacent ends of said rod and said pin then having said angular shape, means for clamping said rod in a fiXed position at a point at the rear of said blades, stationary stop means between said clamping means and said blades for determining the normal position of said blades prior to impressing said blades into said rod, mounting said blades so as to be slidable together as a unit for a limited distance from said stop means in the axial direction of said rod so that, while said blades are being impressed into said rod, the unclamped section of said rod in front of said blades will yield together with said blade unit in said axial direction away from said stop means because of the V-shape of said blades, and means for returning said blade unit to said normal position after said section of said rod forming a pin has been cut off by said blades.
Claim 2
Independent Claim
273 words
An apparatus for producing pins with wedge-shaped ends for subsequently producing chain links therefrom, comprising a pair of notching blades each having a substantially V-shaped crosssection with an apex facing that of the other blade, and means for slidably mounting said blades and for reciprocating them in opposite directions to each other within a common plane extending transverse to the axis of a rod from which a pin is to be cut by said blades so that each blade is impressed into said rod substantially up to the longitudinal axis of said rod and a section is cut off said rod to form one of said pins when both blades reach said axis of said rod the adjacent ends of said rod and said pin then having said angular shape, means for clamping said rod in a fiXed position at a point at the rear of said blades, stationary stop means between said clamping means and said blades for determining the normal position of said blades prior to impressing said blades into said rod, mounting said blades so as to be slidable together as a unit for a limited distance from said stop means in the axial direction of said rod so that, while said blades are being impressed into said rod, the unclamped section of said rod in front of said blades will yield together with said blade unit in said axial direction away from said stop means because of the V-shape of said blades, and means for returning said blade unit to said normal position after said section of said rod forming a pin has been cut off by said blades.
Claim 3
Dependent Claim
37 words
An apparatus as defined in claim 1, in which said returning means comprise at least one spring acting upon said blade unit, said spring unit being yieldable in said axial direction against the action of said spring.
Claim 4
Independent Claim
230 words
An apparatus for producing pins with wedge-shaped ends for subsequently producing chain links therefrom, comprising a pair of notching blades each having a substantially V-shaped cross-section with an apex facing that of the other blade, and means for slidably mounting said blades and for reciprocating them in opposite directions to each other within a common plane extending transverse to the axis of a rod from which a pin is to be cut by said blades so that each blade is impressed into said rod substantially up to the longitudinal axis of said rod and a section is cut off said rod to form one of said pins when both blades reach said axis of said rod the adjacent ends of said rod and said pin then having said angular shape, said means for slidably mounting and reciprocating said blades comprising a shaft mounted in a fixed position, and comprising a pair of two-armed levers mounted on said shaft so as to be pivotable in opposite diections to each other about said shaft and also to be slidable together as a unit along said shaft in its axial direction, means for removably securing said blades to the arms of said levers at one side of said shaft, and means for moving both other arms of said levers equally toward and away from each other and for thereby moving said blades accordingly.
Claim 5
Independent Claim
230 words
An apparatus for producing pins with wedge-shaped ends for subsequently producing chain links therefrom, comprising a pair of notching blades each having a substantially V-shaped cross-section with an apex facing that of the other blade, and means for slidably mounting said blades and for reciprocating them in opposite directions to each other within a common plane extending transverse to the axis of a rod from which a pin is to be cut by said blades so that each blade is impressed into said rod substantially up to the longitudinal axis of said rod and a section is cut off said rod to form one of said pins when both blades reach said axis of said rod the adjacent ends of said rod and said pin then having said angular shape, said means for slidably mounting and reciprocating said blades comprising a shaft mounted in a fixed position, and comprising a pair of two-armed levers mounted on said shaft so as to be pivotable in opposite diections to each other about said shaft and also to be slidable together as a unit along said shaft in its axial direction, means for removably securing said blades to the arms of said levers at one side of said shaft, and means for moving both other arms of said levers equally toward and away from each other and for thereby moving said blades accordingly.
Claim 6
Dependent Claim
17 words
An apparatus as defined in claim 3, in which said first member forms a stationary supporting member.
Claim 7
Dependent Claim
26 words
An apparatus as defined in claim 4, in which said second member forms a lever which is pivotable in response to the movements of said blades.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |