US3579828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy-duty metal snips
Assignee: A M HEXDALL CO
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Filing: 1969-06-30
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Granted: 1971-05-25
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Expires: 1989-06-30
Abstract
Abstract A pair of heavy-duty metal snips is disclosed in which the operative blade is moved by an eccentric pin coupled to the operative handle by a crank arm and link. The other blade is rigid with a flat mounting plate and the link is designed to nest within cooperative portions of the handle. The crank arm, link and eccentric are arranged so that the mechanical advantage transferred to the operative blade increases as it moves toward the closed position.
Inventors
- 👤 Andrew M Hexdall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:07
CPC Classifications
B; B23; B23D; B23D29/00; B23D29/02; B23D29/026
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
134 words
Metal cutting snips comprising, in combination, a pair of cutting blades and a pair of handles with one of the handles rigidly connected to one of the blades by a mounting plate on which the other handle is pivotally mounted, a shaft journaled for rotation in an opening defined by the mounting plate and carrying at one end a crank arm connected to the other handle by a link and carrying at the other end an eccentric pivot on which the other blade is pivotally mounted, and means including a pivot post projecting from the mounting plate and into a slot defined in the other blade for causing pivotal swinging movement of the other blade on the eccentric pivot as the shaft is rotated by the other handle through the crank arm and link.
Claim 2
Dependent Claim
134 words
Metal cutting snips comprising, in combination, a pair of cutting blades and a pair of handles with one of the handles rigidly connected to one of the blades by a mounting plate on which the other handle is pivotally mounted, a shaft journaled for rotation in an opening defined by the mounting plate and carrying at one end a crank arm connected to the other handle by a link and carrying at the other end an eccentric pivot on which the other blade is pivotally mounted, and means including a pivot post projecting from the mounting plate and into a slot defined in the other blade for causing pivotal swinging movement of the other blade on the eccentric pivot as the shaft is rotated by the other handle through the crank arm and link.
Claim 3
Dependent Claim
40 words
Metal cutting snips as defined in claim 1 wherein the pivot post, eccentric pivot, crank arm, link and other handle are arranged so that the mechanical advantage transferred to the other blade increases as it moves toward the closed position.
Claim 4
Dependent Claim
36 words
Metal cutting snips as defined in claim 1 wherein the one blade is disposed substantially at right angles to the mounting plate and defines a cutting edge spaced from and substantially parallel to the mounting plate.
Claim 5
Dependent Claim
30 words
Metal cutting snips as defined in claim 1 wherein the other blade is in the form of a substantially flat, platelike element disposed in face-to-face relation with the mounting plate.
Claim 6
Dependent Claim
40 words
Metal cutting snips as defined in claim 3 wherein the other blade is in the form of a platelike element defining a cutting edge along the lower portion thereof adapted to cooperate with the cutting edge on the one blade.
Claim 7
Dependent Claim
49 words
Metal cutting snips as defined in claim 5 wherein the lower portion of the other blade adjacent the cutting edge Thereof is adapted to engage and spread one part of the cut metal relative to the other part thereby facilitating the advance of the snips for the next cut.
Claim 8
Dependent Claim
26 words
Metal cutting snips as defined in claim 1 wherein the forward portion of the one handle is hollowed out to receive the crank arm and link.
Claim 9
Dependent Claim
27 words
Metal cutting snips as defined in claim 1 wherein the one handle is longitudinally split into two pieces with the mounting plate secured between the two pieces.
Claim 10
Dependent Claim
44 words
Metal cutting snips as defined in claim 8 wherein the mounting plate is secured between the two handle pieces by two-piece rivets including a hardened sleeve having a head on one end and a deformable center pin having a head on the other end.
Claim 11
Dependent Claim
42 words
Metal cutting snips as defined in claim 1 wherein the eccentric pivot is in the form of a two-piece rivet including a hardened sleeve having a head on one end and a deformable center pin having a head on the other end.
Claim 12
Dependent Claim
42 words
Metal cutting snips as defined in claim 1 wherein the pivot post is in the form of a two-piece rivet including a hardened sleeve having a head on one end and a deformable center pin having a head on the other end.
Claim 13
Dependent Claim
36 words
Metal cutting snips as defined in claim 11 wherein the sleeve is formed with oppositely facing flats adapted to cooperate with the sides of the slot in the other blade to increase the contact surface therebetween.
Claim 14
Dependent Claim
29 words
Metal cutting snips as defined in claim 1 wherein the eccentric pivot is in the form of a key pin for nonrotatably securing the crank arm to the shaft.
Claim 15
Dependent Claim
43 words
Metal cutting snips as defined in claim 1 wherein the other handle has a substantially C-shaped open end with one leg of the C pivoted on the mounting plate and the link is pivotally connected to the other leg of the C-shaped end.
Claim 16
Dependent Claim
22 words
Metal cutting snips as defined in claim 14 wherein the crank arm is nested within the C-shaped end of the other handle.
References Cited (Backward Citations)
US985048A
Cited
US3090121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |