EP0739265B1 - Pliers with adjustable spring - Google Patents

Pliers with adjustable spring Download PDF

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Publication number
EP0739265B1
EP0739265B1 EP94931252A EP94931252A EP0739265B1 EP 0739265 B1 EP0739265 B1 EP 0739265B1 EP 94931252 A EP94931252 A EP 94931252A EP 94931252 A EP94931252 A EP 94931252A EP 0739265 B1 EP0739265 B1 EP 0739265B1
Authority
EP
European Patent Office
Prior art keywords
recesses
spring
joint
handle
handles
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
EP94931252A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0739265A1 (en
Inventor
Conny Jansson
Hakan Bergkvist
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.)
Kapman AB
Original Assignee
Sandvik AB
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 Sandvik AB filed Critical Sandvik AB
Publication of EP0739265A1 publication Critical patent/EP0739265A1/en
Application granted granted Critical
Publication of EP0739265B1 publication Critical patent/EP0739265B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B7/00—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • B25B7/18—Adjusting means for the operating arms

Definitions

  • Pliers and similar hand tools such as shears and secateurs, which in use are repeatedly opened and closed several times are often made with a return spring for automatic opening when the gripping force on the handles is reduced (see for instance GB-A-762740).
  • the return spring is often linear, requiring an increasing force as the jaws are progressively closed. In order not to tire the hand and to provide the best control of the force used for holding, shearing or deforming the workpiece, it would be preferable that the return force would remain constant or decrease.
  • the return force when the jaws are closed is adjustable to suit different tasks and the strength of different persons, and that the equilibrium opening when there is no more return force can be adjusted independent of the maximum opening allowed by the joint.
  • the present invention provides for a pliers type tool as defined in claim 1, dependant claims 2 and 3 defining prefered embodiments.
  • the pliers type tool according to the invention is provided with a return spring which is adjustable to provide different return forces and different equilibrium openings to suit the user and the task.
  • figure 1 shows a tool with the spring located in a position with low return force and large equilibrium opening
  • figure 2 shows a tool with with the spring located in a position with large return force and small euilibrium opening
  • figure 3 is a graph of how the return force can depend on the opening with different spring locations.
  • the pliers type tool comprises two shanks held together by a joint (10). Between the handle parts (11,12) of the shanks is a leaf spring (13) which when unstressed is basically straight, but when mounted is S-shaped, with its ends inserted in slots or recesses in the handles (11,12). A first end (14) of the spring is located closer to the joint (10) and is inserted in one of a plurality of recesses in a first handle (11), where a recess (15) at greater distance from the joint (10) results in a greater return force and a recess (16) at a lesser distance from the joint (10) results in a lesser return force.
  • the second end (17) of the spring is located farther from the joint (10) and is inserted in one of a plurality of recesses in the second handle (12), where a recess (18) at a greater distance from the joint (10) results in a lesser equilibrium opening and a recess (19) at a lesser distance from the joint (10) results in a greater equilibium opening.
  • the choice of recess (15,16) will have as its main effect a variation of the leverage of the spring force, directly affecting the return force.
  • the recesses (15,16) of the first handle are almost at the same distance from whichever recess in the second handle has been utilized.
  • the recesses (18,19) of the second handle (12) are so close that they result in roughly the same return force, especially if there is some angular difference, but they have a strong influence on the euilibrium opening.
  • the recesses can be shaped and adapted to the ends of the spring in different ways. Slots with a narrow opening combined with thickened ends (14,17) of the spring allow insertion of the spring from the side and prevent accidental dislodging of the spring when the tool is maximally opened.
  • the slots need not be parallel to each other.
  • the spring can also be made from round spring wire, and in such case the recesses can be drilled holes.
  • Figure 3 shows how the return force F on the handles depends on the opening D between the jaws with two different locations of the spring.
  • the first graph (21) shows the dependence for a tool with the spring placed as in figure 1, with a small return force (24) when the jaws are closed, since the spring force against the first handle (11) has little leverage, and with a great equilibrium opening (23) since the recess (19) in the second handle (12) is rather close to the joint (10).
  • the second graph (22) shows the dependence for a tool where the spring is placed as in figure 2, where the return force (24) with closed jaws is larger due to larger leverage for the spring force against the first handle (11), and the equilibrium opening (23) is smaller since the recess (18) in the second handle is farther from the joint (10).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Scissors And Nippers (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
EP94931252A 1993-10-19 1994-10-18 Pliers with adjustable spring Expired - Lifetime EP0739265B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9303427A SE506068C2 (sv) 1993-10-19 1993-10-19 Tång med ställbar returfjäder
SE9303427 1993-10-19
PCT/SE1994/000977 WO1995011112A1 (en) 1993-10-19 1994-10-18 Pliers with adjustable spring

Publications (2)

Publication Number Publication Date
EP0739265A1 EP0739265A1 (en) 1996-10-30
EP0739265B1 true EP0739265B1 (en) 1997-08-27

Family

ID=20391461

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94931252A Expired - Lifetime EP0739265B1 (en) 1993-10-19 1994-10-18 Pliers with adjustable spring

Country Status (5)

Country Link
EP (1) EP0739265B1 (sv)
DE (1) DE69405253T2 (sv)
SE (1) SE506068C2 (sv)
TW (1) TW255847B (sv)
WO (1) WO1995011112A1 (sv)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE515916C2 (sv) * 1998-09-11 2001-10-29 Kapman Ab Fjäder för att öppna ett tångliknande verktyg
SE525960C2 (sv) 2003-10-15 2005-05-31 Kapman Ab Handverktyg med två skänklar med en separerande fjäder reglerbar via styrningar i en hylsa på ena skänkeln
DE102017114260A1 (de) * 2017-06-27 2018-12-27 Aesculap Ag Medizinisches Handinstrument mit reinigungsoptimiertem Federelement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1802904A (en) * 1928-04-25 1931-04-28 Cyrus A Bryant Latch for tool handles
GB762740A (en) * 1954-03-22 1956-12-05 Johan Martin Jonsson Improvements relating to pliers or other hand tools

Also Published As

Publication number Publication date
SE9303427L (sv) 1995-04-20
TW255847B (sv) 1995-09-01
SE506068C2 (sv) 1997-11-10
DE69405253D1 (de) 1997-10-02
DE69405253T2 (de) 1998-01-02
WO1995011112A1 (en) 1995-04-27
EP0739265A1 (en) 1996-10-30
SE9303427D0 (sv) 1993-10-19

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