EP0037673A1 - Unitary tool mechanism - Google Patents
Unitary tool mechanism Download PDFInfo
- Publication number
- EP0037673A1 EP0037673A1 EP81301248A EP81301248A EP0037673A1 EP 0037673 A1 EP0037673 A1 EP 0037673A1 EP 81301248 A EP81301248 A EP 81301248A EP 81301248 A EP81301248 A EP 81301248A EP 0037673 A1 EP0037673 A1 EP 0037673A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- head
- arms
- tool
- beams
- head portion
- 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.)
- Granted
Links
Images
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
- B25B9/00—Hand-held gripping tools other than those covered by group B25B7/00
- B25B9/02—Hand-held gripping tools other than those covered by group B25B7/00 without sliding or pivotal connections, e.g. tweezers, onepiece tongs
Definitions
- This invention relates to a tool having a pair of arms secured at a head for pivotal movement between open and closed conditions, and a resilient member between the arms arranged to bias them towards an open condition.
- Such tools are commonly used as hand tools or pliers for applying force or a cutting action to a work piece, and are also used as mechanisms in assemblies.
- a tool having a pair of arms secured at a head for pivotal movement between open and closed conditions and a resilient means between the arms arranged to bias them towards an open condition
- the head, the arms and the resilient means comprise a unitary structure formed in one piece from resilient material, the arms extending from the head in divergent manner and the resilient means comprising a pair of beams extending from respective portions of the arms spaced from the head, inwardly between the arms towards the head to a second head portion, the beams being adapted, on movement of the arms together, to engage progressively along their lengths from the second head portion.
- the tool is suitably formed from a resilient plastics material having a high yield strength.
- the tool of Figures 1 to 4 comprises a first head 2 defining a lower jaw surface 6 and a second head 4 defining an upper jaw surface 7 spaced below surface 6.
- the surface 6 is defined at the roof of a cavity in the first head 2 between side walls 8, 10 adapted slidably to receive head 4 between them.
- a pair of arms 12, 14 extend from the head 2 downwardly on opposite sides of the cavity in divergent manner. Initial portions of the arms 12, 14 are of progressively decreasing thickness towards lower thickened end portions 12A, 14A defining handles which can be gripped in a hand in conventional manner.
- the second head 4 is supported from the lower ends of the arias 12, 14 by a pair of arcuate resilient beams 16, 18, convex towards each other and converging upwardly with upper end portions 16B, 18B closely adjacent and integral with the head 4.
- the heads 2, 4, the arms 12, 14, and the beams 16, 18 are integrally formed as a unitary structure, suitably by moulding or by extrusion from a resilient plastics material having a high yield strength. It will be understood that a number of tools may be formed from a single moulding or extrusion having a cross section corresponding to the elevation of Figure 1, and individual tools severed transversely of the length of moulding or extrusion.
- closure of the handle portions 12A, 14A together effects pivotal movement about the head 2 by bending of the thinner portions of the arms 12, 14.
- the arcuate beams 16, 18 progressively engage at their upper portions 16B, 18B and are supported against each other as seen in Figure 2, effectively to increase their length in the direction of arrow 20 and drive the head 4 into the cavity of head 2 towards jaw surface 6.
- the sides 8, 10 of the cavity and the engaged portions of beams 16, 18 resist lateral displacement of the head 4 and maintain its orientation.
- a workpiece may be engaged between the jaw faces 6, 7 and subject to compression.
- the beams 16, 18 are correspondingly subject to compression and the arms 12, 14 to tension. Resilience of the beams and the arms serves to open the tool when the handles are released.
- the head 4 at its underside between the beams 16, 18 is formed with a cylindrical socket 22 extending through the head 4 transversely of its line of action.
- the socket has a restricted opening between the beams 16, 18 and receives a complementary cylindrical head 26A of an upright rail 26 which extends downwardly between the beams 16, 18 and is stiffened by a transverse flange 28 at a rear side of the tool.
- the beams 16, 18 are flattened against the rail 26 as the handles 12, 14 are closed, and the rail serves to support the beams.
- the head 4 is formed at its rear side with an upwardly directed extension 4A which extends slidably through a recess 2A in a rear side of the head 2.
- the extension 4A at its upper end is formed with a further head portion 4B presenting a lower jaw face 4C spaced from and opposed to a jaw face 2B presented by the upper side of head 2.
- a workpiece may be gripped between jaw faces 6 and 7 on closure of the tool or between surfaces 4C, 2B on opening of the tool handles.
- the head 2 is formed with an upright bore in which the lower, open end of a cylinder 30 is secured.
- An upright rod 36 is secured to the head 4 and extends coaxially through the lower end of the cylinder 30.
- a washer type piston 38 is secured at the upper end of the rod 36, and the upper closed end 32 of the cylinder is formed with an outlet 34.
- Actuation of the tool causes reciprocation of the piston 38 in the cylinder and alternate compression and suction in the cylinder and.its outlet 34, the resilience of the beams 16, 18 effecting opening of the tool and downward movement of the piston 38.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
Description
- This invention relates to a tool having a pair of arms secured at a head for pivotal movement between open and closed conditions, and a resilient member between the arms arranged to bias them towards an open condition.
- Such tools are commonly used as hand tools or pliers for applying force or a cutting action to a work piece, and are also used as mechanisms in assemblies.
- It is an object of the invention to provide a tool of simple unitary structure which may be made economically, for example by moulding or extrusion.
- According to the present invention a tool having a pair of arms secured at a head for pivotal movement between open and closed conditions and a resilient means between the arms arranged to bias them towards an open condition is characterised in that the head, the arms and the resilient means comprise a unitary structure formed in one piece from resilient material, the arms extending from the head in divergent manner and the resilient means comprising a pair of beams extending from respective portions of the arms spaced from the head, inwardly between the arms towards the head to a second head portion, the beams being adapted, on movement of the arms together, to engage progressively along their lengths from the second head portion.
- The tool is suitably formed from a resilient plastics material having a high yield strength.
- The invention will now be described with reference to the accompanying partly diagrammatic drawings, in which:-
- Figure 1 is an elevation of a tool for applying force between a pair of jaw members and in an open condition;
- Figure 2 is a view similar to that of Figure 1 but with the tool in a partially closed condition;
- Figure 3 is a side elevation of the tool of Figure 1;
- Figure 4 is a section taken on the line.4 - 4 of Figure 1;
- Figure 5 is a sectional elevation of a modified tool mounted on a support rail;
- Figure 6 is a fragmentary section taken on the line 6 - 6 of Figure 5;
- Figure 7 is a fragmentary elevation of the head portion of a further modified tool;
- Figure 8 is a fragmentary section taken on the line 8 - 8 of Figure 7;
- Figure 9 is a fragmentary sectional elevation of a yet further modified tool in an open condition; and
- Figure 10 is a fragmentary elevation similar to that of Figure 9 but with the tool in a partially closed condition.
- The tool of Figures 1 to 4 comprises a
first head 2 defining alower jaw surface 6 and asecond head 4 defining anupper jaw surface 7 spaced belowsurface 6. Thesurface 6 is defined at the roof of a cavity in thefirst head 2 betweenside walls head 4 between them. - A pair of
arms head 2 downwardly on opposite sides of the cavity in divergent manner. Initial portions of thearms end portions - The
second head 4 is supported from the lower ends of thearias resilient beams upper end portions head 4. - The
heads arms beams - In operation, closure of the
handle portions head 2 by bending of the thinner portions of thearms arcuate beams upper portions arrow 20 and drive thehead 4 into the cavity ofhead 2 towardsjaw surface 6. - The
sides beams head 4 and maintain its orientation. A workpiece, not shown, may be engaged between thejaw faces beams arms - In the modified tool of Figures 5 and 6, like reference numerals refer to similar parts as described with reference to Figures 1 to 4. The
head 4 at its underside between thebeams head 4 transversely of its line of action. The socket has a restricted opening between thebeams cylindrical head 26A of anupright rail 26 which extends downwardly between thebeams transverse flange 28 at a rear side of the tool. - In operation of the tool the
beams rail 26 as thehandles - In the embodiment of Figures 7 and 8, in which like reference numerals again refer to similar parts as described with reference to Figures 1 to 4, the
head 4 is formed at its rear side with an upwardly directedextension 4A which extends slidably through arecess 2A in a rear side of thehead 2. - The
extension 4A at its upper end is formed with afurther head portion 4B presenting alower jaw face 4C spaced from and opposed to ajaw face 2B presented by the upper side ofhead 2. - In the embodiment of Figures 7 and 8, a workpiece may be gripped between jaw faces 6 and 7 on closure of the tool or between
surfaces - In the embodiment of Figures 9 and 10 in which like reference numerals again refer to similar parts as described in connection with Figures 1 to 4, the
head 2 is formed with an upright bore in which the lower, open end of acylinder 30 is secured. Anupright rod 36 is secured to thehead 4 and extends coaxially through the lower end of thecylinder 30. Awasher type piston 38 is secured at the upper end of therod 36, and the upper closedend 32 of the cylinder is formed with anoutlet 34. - Actuation of the tool causes reciprocation of the
piston 38 in the cylinder and alternate compression and suction in the cylinder and.itsoutlet 34, the resilience of thebeams piston 38.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81301248T ATE5861T1 (en) | 1980-04-03 | 1981-03-24 | UNIFORM TOOLING MECHANISM. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13703580A | 1980-04-03 | 1980-04-03 | |
US137035 | 1998-08-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0037673A1 true EP0037673A1 (en) | 1981-10-14 |
EP0037673B1 EP0037673B1 (en) | 1984-01-18 |
Family
ID=22475530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81301248A Expired EP0037673B1 (en) | 1980-04-03 | 1981-03-24 | Unitary tool mechanism |
Country Status (12)
Country | Link |
---|---|
EP (1) | EP0037673B1 (en) |
JP (1) | JPS56152586A (en) |
AR (1) | AR224190A1 (en) |
AT (1) | ATE5861T1 (en) |
AU (1) | AU539722B2 (en) |
BR (1) | BR8101947A (en) |
CA (1) | CA1147582A (en) |
DE (1) | DE3161923D1 (en) |
ES (1) | ES267154Y (en) |
HK (1) | HK26787A (en) |
MX (1) | MX153247A (en) |
YU (1) | YU85681A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0574886A2 (en) * | 1992-06-15 | 1993-12-22 | Sony Corporation | Optical recording medium and playback method thereof |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2419818A1 (en) * | 1973-04-24 | 1974-11-14 | Ici Ltd | TWEEZERS |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2430794A (en) * | 1947-11-11 | Safety shears | ||
US3496616A (en) * | 1968-08-15 | 1970-02-24 | Frank B Vazquez | Gripping and locking device |
-
1981
- 1981-03-12 AU AU68293/81A patent/AU539722B2/en not_active Ceased
- 1981-03-18 CA CA000373293A patent/CA1147582A/en not_active Expired
- 1981-03-24 ES ES1981267154U patent/ES267154Y/en not_active Expired
- 1981-03-24 EP EP81301248A patent/EP0037673B1/en not_active Expired
- 1981-03-24 DE DE8181301248T patent/DE3161923D1/en not_active Expired
- 1981-03-24 AT AT81301248T patent/ATE5861T1/en not_active IP Right Cessation
- 1981-03-25 AR AR284736A patent/AR224190A1/en active
- 1981-03-31 BR BR8101947A patent/BR8101947A/en not_active IP Right Cessation
- 1981-04-01 MX MX186658A patent/MX153247A/en unknown
- 1981-04-01 JP JP4733181A patent/JPS56152586A/en active Granted
- 1981-04-01 YU YU00856/81A patent/YU85681A/en unknown
-
1987
- 1987-04-02 HK HK267/87A patent/HK26787A/en not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2419818A1 (en) * | 1973-04-24 | 1974-11-14 | Ici Ltd | TWEEZERS |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0574886A2 (en) * | 1992-06-15 | 1993-12-22 | Sony Corporation | Optical recording medium and playback method thereof |
EP0574886A3 (en) * | 1992-06-15 | 1994-01-26 | Sony Corp |
Also Published As
Publication number | Publication date |
---|---|
HK26787A (en) | 1987-04-10 |
MX153247A (en) | 1986-09-02 |
AU539722B2 (en) | 1984-10-11 |
CA1147582A (en) | 1983-06-07 |
YU85681A (en) | 1983-06-30 |
ES267154U (en) | 1983-11-01 |
BR8101947A (en) | 1981-10-06 |
JPS64191B2 (en) | 1989-01-05 |
AR224190A1 (en) | 1981-10-30 |
JPS56152586A (en) | 1981-11-26 |
ES267154Y (en) | 1984-05-01 |
ATE5861T1 (en) | 1984-02-15 |
DE3161923D1 (en) | 1984-02-23 |
EP0037673B1 (en) | 1984-01-18 |
AU6829381A (en) | 1981-10-08 |
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