US3863339A - Retractable blade knife - Google Patents

Retractable blade knife Download PDF

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Publication number
US3863339A
US3863339A US363033A US36303373A US3863339A US 3863339 A US3863339 A US 3863339A US 363033 A US363033 A US 363033A US 36303373 A US36303373 A US 36303373A US 3863339 A US3863339 A US 3863339A
Authority
US
United States
Prior art keywords
blade
knife
cover
carrier
button
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US363033A
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English (en)
Inventor
Albert Reaney
Michael Taylor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stanley Works Ltd
Original Assignee
Stanley Tools Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stanley Tools Ltd filed Critical Stanley Tools Ltd
Application granted granted Critical
Publication of US3863339A publication Critical patent/US3863339A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B5/00—Hand knives with one or more detachable blades
    • B26B5/001—Hand knives with one or more detachable blades with blades being slid out of handle immediately prior to use

Definitions

  • the retractable blade knife of the present invention is [30] Forelgn Apphcatlon Prmmy Data designed to have the minimum number of parts and to May 26, 1972 Great Britain 25061/72 require the minimum amount of fabrication.
  • the casing is in two parts, namely, a body of molded plastic [52] US. Cl 30/162, 30/320, 30/336, and a cover of pressed sheet metal, which come apart I 30/338, 30/339 for removal and replacement of the blade.
  • Cl B26b l /08 ing button has a flange which engages notches in inl l Field Of Search 30/162. 335, 93, wardly drawn skirts of the cover, the skirts surround- 30/336, 337, 338, 339 ing 'a slot through which the button extends.
  • An arched cantilever spring is welded at one end to the 1 References Cited blade carrier. The button is mounted on the arch of UNITED STATES PATENTS the spring intermediate its ends.
  • the spring 22 carries out all three functions of firstly attaching the button 21 to carrier 13,;secondly engaging the blade 11 to hold the blade 11 in position relative to the carrier member 13 and thirdly operatingthe facility for reliable locking of the blade 11 in the different positions and is the only I spring in the knife 10.
  • the body 14 is formed with a facility in the form of a hole 49 to allow for hanging the knife 10 on a hook, not shown, connection of the knife to a keyring, not shown, attachment of the knife to a string anchorage, not shown, or the like.
  • a retractable blade knife comprising a casing having a slot in one side thereof, a blade, a slidable blade carrier mounting the blade and engaging at least one edge thereof, an operating button projecting through said side slot and a leaf spring associated with the operatingbutton for biasing thebutton into selective locking engagement with the casing and for removably holding the blade on the blade carrier, said casing comprises a body having a slot in'one end through which the blade can be extended and 'retracted'and a cover detachably attachable to the body to enclose the blade carrier and spring, wherein the cover-has two curled opposite end portions which respectively hook over two corresponding end portions of the body, firstly one end portion of the cover being hooked over one end portion of the body and then the cover being pivotable thereabout until the other end portion of the cover hooks over the other end portion of the body, whereby the cover can snap into place when attached to the body.
  • the body is of molded plastics material and the cover is of sheet metal;
  • the spring is an arched cantilever spring which is permanently attached to the blade carrier;
  • the button is formed with a flange'which can seat in between any one of three pairs of detent-forming
  • a retractable blade knife as claimed in claim 10 wherein a tang of the blade is abuttingly engaged by a rearward pair of lugs and a forward pair of lugs, said pairs of lugs forming part of the blade carrier; the rear end of the tang is abuttinglyengag'ed by a forwardly di rected lug of the blade carrier; and the rear end of a keyhole slot in the tang is abuttingly engaged by a rearwardly directed lug of the blade carrier; the leaf spring pressing the blade against a base of the blade carrier; said lugs all upstanding from the base of the blade carrier.
  • the retractable blade knife of the present invention comprises a casing, a blade, a slidable blade carrier, an operating button and a leaf spring, wherein the operating button projects through a slot in one side of the casing, wherein the operating button is connected to the blade carrier by the leaf spring, wherein the blade carrier engages at least one edge of the blade for locating theblade, wherein the operatingbutton is biased by the leaf spring into engagement with detents in the casing to lock the blade selectively in extended and retracted positions, and wherein the casing is adapted to be opened for removal and replacement of the blade.
  • the retractable blade knife of the present invention is characterised in. that the leaf spring bears against one face of the blade to hold the blade removably tothe blade carrier.
  • the casing comprises a body and a cover, the body having in one end a slot through which the blade can be'extended and retracted, the body also having a cavity therein for the blade when retracted and for the blade carrier, the cavity'having an opening at one side of the body for removal oftheblade carrier together with the blade, the cover being detachably attachable to the body to close the cavity opening, and
  • the cavity providing an additional blade storage space.
  • the slot through which the operating button projects is in the cover.
  • the operating button is biased by the leaf spring into engagement with the detents in the casing to lock the blade selectively not only in the extended and retracted positions but also in'an intermediate positioll. 1
  • FIG. 1 illustrates in side elevation a preferred retractable blade knife in accordance with the invention, showing the blade fully retracted
  • FIG. 2 is a similar view at the same scale of the knife illustrated in FIG. 1 but with the blade fully extended and the cover removed and with a spare blade in the cavity;
  • FIG. 3 is a section on line Illlll in FIG. 2 but at twice the scale of FIGS. 1 and2;
  • FIG. 4 is an exploded view of the knife at the same 7 scale as FIG. 3.
  • the cover 15 is detachably attachable to the body 14 to close the cavity opening 19.
  • A- manually operable button 21 is connected to the blade carrier 13 by being attached to a light, arched cantilever leaf spring 22 which is itself permanently attached at 23 by being welded to the blade carrier 13 and which engages one face of the retractable blade 11 at 24 to hold the blade 11 removably to the blade carrier 13.
  • the button 21 projects through an elongate slot 25 in the cover 15 at one side of the casing 12 for manual extension and retraction of the blade 11.
  • the cavity 18 provides additional blade storage space for a spare blade 26 as shown place when attached to the body 14.
  • Sides 31 and-32 of the body 14 have rebates 33 for the cover 15 to nest therein.
  • the cover 15 can be detached from the body 14. by simply pushing the cover end portion 28 up so as to unhook the cover end portion 28 from body end portion and then unhooking cover end portion 27 from body end portion 29.
  • Edges of the blade 11 are engaged by the blade carrier 13 to locate the blade 11 in the given position as shown relative to the blade carrier 13.
  • the blade carrier 13 is also of pressed sheet metal.
  • a tang 34 of the blade 11 is abuttingly engaged by a rearward pair of lugs 35 and a forward pair of lugs 36, the lugs 35 and 36 forming part of the blade carrier 13; the rear end 37 of the tang-34 is abuttingly engaged by a forwardly directed lug 38 of the blade carrier 13; and
  • the rear end 39 of a keyhole slot 40 in the tang 34 is abuttingly engaged by a rearwardly directed lug 41 of the blade carrier 13.
  • the leaf spring 22 presses the blade 11 against a base 42 of the carrier 13.
  • the blade 11 can be detached from the carrier 13 (and reattached thereto or replaced by the spare blade 26) when the blade carrier 13 has been removed, together with the blade 11, from the cavity 18.
  • the arrangement of the lugs 38 and 41' so that each is directed towards the other provides positive, bi-directional blade location.
  • the lugs 35, 36,38 and 41 are all upstanding from the base 42. Of course, the necessary clearance is provided between the blade 1 1 and the lugs 35, 36, 38 and 41 for easy removal and replacement of the blade 11.
  • the free end of the spring 22 is lightly loaded towards the base 42.
  • the dimensions, geometry and properties of the spring 22 are sov selected as to allow the blade tang 34 to be easily pushed between the base 42 and the spring 22, until the blade 11 becomes located-and lightly retained by the lugs 35, 36, 38 and 41.
  • the button 21 is formed with a a flange 43 which can seat in between any one of three'pairs of notches 44, 45 and 46 LII the blade.
  • a retractable blade knife as claimed in claim 12 wherein the button is attached to an arched portion of the spring intermediate positions at which the spring respectively is attached to the blade carrier and engages the blade, so that the flange can be unseated by depression of the button for extension or retraction of

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Knives (AREA)
US363033A 1972-05-26 1973-05-23 Retractable blade knife Expired - Lifetime US3863339A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2506172A GB1365225A (en) 1972-05-26 1972-05-26 Retractable blade knife

Publications (1)

Publication Number Publication Date
US3863339A true US3863339A (en) 1975-02-04

Family

ID=10221581

Family Applications (1)

Application Number Title Priority Date Filing Date
US363033A Expired - Lifetime US3863339A (en) 1972-05-26 1973-05-23 Retractable blade knife

Country Status (8)

Country Link
US (1) US3863339A (de)
CA (1) CA981897A (de)
DE (1) DE2325749A1 (de)
FR (1) FR2186871A5 (de)
GB (1) GB1365225A (de)
IT (1) IT987911B (de)
SE (1) SE385671B (de)
ZA (1) ZA733493B (de)

Cited By (168)

* Cited by examiner, † Cited by third party
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US4621425A (en) * 1984-10-05 1986-11-11 Stanley Works Retractable knife handle
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US5545175A (en) * 1993-06-18 1996-08-13 Leonard Bloom Disposable quarded finger scalpel for inserting a line in a patent and lock off therefor
US5749886A (en) * 1993-06-18 1998-05-12 Leonard Bloom Disposable guarded finger scalpel for inserting a line in a patient and blade therefor
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Also Published As

Publication number Publication date
GB1365225A (en) 1974-08-29
SE385671B (sv) 1976-07-19
CA981897A (en) 1976-01-20
FR2186871A5 (de) 1974-01-11
DE2325749A1 (de) 1973-12-13
ZA733493B (en) 1974-04-24
IT987911B (it) 1975-03-20

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