US3366764A - Switch actuating means for power operated knife and other tools - Google Patents

Switch actuating means for power operated knife and other tools Download PDF

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Publication number
US3366764A
US3366764A US469208A US46920865A US3366764A US 3366764 A US3366764 A US 3366764A US 469208 A US469208 A US 469208A US 46920865 A US46920865 A US 46920865A US 3366764 A US3366764 A US 3366764A
Authority
US
United States
Prior art keywords
button
contact
actuating means
lever
contacts
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
US469208A
Other languages
English (en)
Inventor
Korshak Harvey
Robert M Peterson
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.)
Scovill Inc
Original Assignee
Scovill Inc
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 Scovill Inc filed Critical Scovill Inc
Priority to US469208A priority Critical patent/US3366764A/en
Priority to GB8299/66A priority patent/GB1127272A/en
Priority to FR51049A priority patent/FR1470049A/fr
Priority to BE677276D priority patent/BE677276A/xx
Priority to CH311366A priority patent/CH464312A/fr
Priority to SE473666A priority patent/SE220258C1/sv
Priority to ES0326343A priority patent/ES326343A1/es
Priority to NL6607086A priority patent/NL6607086A/xx
Application granted granted Critical
Publication of US3366764A publication Critical patent/US3366764A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
    • B23B45/001—Housing of the drill, e.g. handgrip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B7/00—Hand knives with reciprocating motor-driven blades
    • B26B7/005—Counter reciprocating blades
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/06—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner

Definitions

  • ABSTRACT OF THE DISCLOSURE Switch actuatin means for a power operated knife and other tools comprising a housing having mounted therein a pair of independently movable manually operable contact actuating members, a pair of electrical contacts each connected to one of the actuating members and when in contact with each other close an electrical circuit, and means limiting the maximum movement of each contact to a distance less than the distance between the contacts of said pair, whereby simultaneously applied and maintained pressure on the actuating members are required to produce circuit closing engagement of the contacts.
  • This invention relates to switch actuating means for power operated knives and other motor driven tools.
  • the main object of the invention is to provide switch actuating means comprising a pair of electrical contacts which cannot be moved accidentally or unintentionally into circuit closing engagement with each other. This object is achieved by providing a pair of contacts each of which is movable toward the other, and each of which must be moved a predetermined distance by independent means before circuit closing contact is established.
  • the switch actuating means comprises a pair of movable contacts each mounted for movement independently of the other.
  • one of the two contacts is connected to a button depressibly mounted in the knife housing, and the other of the two contacts is connected to a lever pivotally mounted in the housing and accessible through an opening in the housing.
  • the depressible button and the pivoted lever are located relatively to each other for manual actuation by the thumb and a finger of one hand of the user exerting pressure in opposite directions.
  • the construction and arrangement are such that pressure must be applied in opposite directions to the button and lever in order to move both contacts toward each other and thus close the circuit which energizes the knife motor for transmitting movement to the blades.
  • the application of pressure on the button alone, or on the lever alone, cannot move the contacts into engagement with each other, and therefore accidental or unintentional actuation of the switch is impossible.
  • the improved switch actuating means are particularly adapted for embodiment in knives and the like where accidental operation of the blades may cause serious injury, but the described construction also may be embodied in other motor operated tools such as drills and the like.
  • FIG. 1 is an elevational side view of a power operated 3,366,764 Patented Jan. 30, 1968 knife embodying the switch actuating means of our invention.
  • FIG. 2 is a top plan view of the same on an enlarged scale, with the blades omitted, and part of the top plate broken away to reveal the switch actuating mechanism.
  • FIG. 3 is a longitudinal vertical sectional view of the switch actuating means, on an enlarged scale, in the plane of the line 33 of FIG. 2, showing the switch in open position.
  • FIG. 4 is a view similar to FIG. 3, showing the switch contacts and mechanism in circuit closing position.
  • FIG. 5 is a transverse vertical sectional view in the plane of the line 5-5 of FIG. 3.
  • the switch actuating means is mounted in the knife 10 in a space between a part 17 of the upper housing and the top plate 12 adjacent and slightly forwardly of the handle 18.
  • the top plate 12 is provided with a round opening adapted to receive the round top portion 20 of the switch button 16.
  • the button 16 is provided with oppositely located ears 21 which project from the side walls 22 of the button beneath the top plate 12 whereby the button is prevented from moving out of the recessed housing 17.
  • a horizontally extending arm 23 projects from one side of the wall 22 of the button 16 in a plane below the top plate 12.
  • the arm 23 serves as mounting means for an electrical contact 24 connected to the arm by a rivet 25.
  • the contact 24 faces downwardly.
  • a lead assembly 26 is connected to the contact 24 by the rivet 25.
  • the part 17 of the upper housing 11 is provided with an elongated opening beneath the handle 18, in communication With the space between the housing 17 and top plate 12.
  • a lever 28 comprising an exposed arm 29 is pivotally connected by a pin 30 to the housing 11.
  • the arm 29 is U-shaped in cross section and is inclined longitudinally downwardly toward and is integral with a normally horizontal contact support 31 which has a depending leg 32.
  • the support 31 is integral with a normally horizontal arm 33 provided with a spring retaining projection 34.
  • a coiled spring 35 is located in the hollow switch button 16 and bears against the underside of the top 20 of the button 16 and against the upper surface of the arm 33 of the lever 28, surrounding the spring retaining projection 34 of the lever arm and the depending projection 36 on the underside of the button top 20.
  • An electrical contact 37 is connected to the support 31 by rivet 38, and a lead assembly 39 is connected to the contact 37 by the rivet 38.
  • the contacts normally are in open position.
  • the contact 24 is moved downwardly and the contact 37 is moved upwardly, as shown in FIG. 4, into engagement and circuit closing position.
  • Depression of the button 16 alone cannot move the contact 24 into engagement with contact 37, and pressure applied to the lever 29 alone cannot move the contact 37 into engagement with the contact 24.
  • Pressure must be applied simultaneously to the parts 16 and 29, in opposite directions, to produce circuit closing contact of the contacts.
  • the spring 35 normally urges the button 16 and arm 33 of lever 28 into the positions shown in FIG. 3.
  • Switch actuating means for a power operated knife having a body with a hollow hand-gripped portion, comprising (a) an externally accessible actuating member mounted in the top of the portion for an unrestrained free vertical travel for a distance,
  • spring means biasing the lever and actuating member away from each other in all positions along their respective travels whereby the contacts engage each other only when and as long as pressure is applied manually to said actuating member and said lever simultaneously.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Knives (AREA)
  • Push-Button Switches (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US469208A 1965-07-02 1965-07-02 Switch actuating means for power operated knife and other tools Expired - Lifetime US3366764A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US469208A US3366764A (en) 1965-07-02 1965-07-02 Switch actuating means for power operated knife and other tools
GB8299/66A GB1127272A (en) 1965-07-02 1966-02-24 Improvements in or relating to switch actuating means
FR51049A FR1470049A (fr) 1965-07-02 1966-02-25 Dispositif d'actionnement d'interrupteur
BE677276D BE677276A (en)) 1965-07-02 1966-03-02
CH311366A CH464312A (fr) 1965-07-02 1966-03-04 Interrupteur à commande manuelle pour un outil entraîné par un moteur électrique
SE473666A SE220258C1 (en)) 1965-07-02 1966-04-06
ES0326343A ES326343A1 (es) 1965-07-02 1966-05-05 Dispositivo de accionamiento de interruptor para una herramienta o instrumento movido por motor.
NL6607086A NL6607086A (en)) 1965-07-02 1966-05-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US469208A US3366764A (en) 1965-07-02 1965-07-02 Switch actuating means for power operated knife and other tools

Publications (1)

Publication Number Publication Date
US3366764A true US3366764A (en) 1968-01-30

Family

ID=23862896

Family Applications (1)

Application Number Title Priority Date Filing Date
US469208A Expired - Lifetime US3366764A (en) 1965-07-02 1965-07-02 Switch actuating means for power operated knife and other tools

Country Status (7)

Country Link
US (1) US3366764A (en))
BE (1) BE677276A (en))
CH (1) CH464312A (en))
ES (1) ES326343A1 (en))
GB (1) GB1127272A (en))
NL (1) NL6607086A (en))
SE (1) SE220258C1 (en))

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5371281A (en) * 1976-12-06 1978-06-24 Masutomo Inaba Hand switch
JPS54124983U (en)) * 1978-02-21 1979-08-31
US4421964A (en) * 1982-04-02 1983-12-20 The Hoover Company Remote switch actuation
US5383875A (en) * 1994-05-31 1995-01-24 Zimmer, Inc. Safety device for a powered surgical instrument

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4309033C2 (de) * 1993-03-20 1999-11-25 Braun Gmbh Sicherheitsschaltvorrichtung für elektrische Geräte

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1729059A (en) * 1927-12-02 1929-09-24 Andrew E Bicsey Electrode holder
US2381077A (en) * 1944-05-02 1945-08-07 Guardian Electric Mfg Co Hand grip switch device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1729059A (en) * 1927-12-02 1929-09-24 Andrew E Bicsey Electrode holder
US2381077A (en) * 1944-05-02 1945-08-07 Guardian Electric Mfg Co Hand grip switch device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5371281A (en) * 1976-12-06 1978-06-24 Masutomo Inaba Hand switch
JPS54124983U (en)) * 1978-02-21 1979-08-31
US4421964A (en) * 1982-04-02 1983-12-20 The Hoover Company Remote switch actuation
US5383875A (en) * 1994-05-31 1995-01-24 Zimmer, Inc. Safety device for a powered surgical instrument

Also Published As

Publication number Publication date
SE220258C1 (en)) 1968-04-30
NL6607086A (en)) 1967-01-03
ES326343A1 (es) 1967-07-01
BE677276A (en)) 1966-09-02
GB1127272A (en) 1968-09-18
CH464312A (fr) 1968-10-31

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