CA1147582A - Unitary tool mechanism - Google Patents
Unitary tool mechanismInfo
- Publication number
- CA1147582A CA1147582A CA000373293A CA373293A CA1147582A CA 1147582 A CA1147582 A CA 1147582A CA 000373293 A CA000373293 A CA 000373293A CA 373293 A CA373293 A CA 373293A CA 1147582 A CA1147582 A CA 1147582A
- Authority
- CA
- Canada
- 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.)
- Expired
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
ABSTRACT
A tool is formed in one piece, suitably from resilient plastics material and comprises a first head (2) from which extend a pair of divergent handles (12, 14) having at their free ends respective resilient beams (16, 18) extending inwardly towards the head (2). The beams (16, 18) at their convergent ends are joined with a head (4) spaced from the head (2), and are arcuately convex towards each other. On pivotal closure of the tool by bending of the arms (12, 14), the beams (16, 18) progressively engage from their upper ends and drive the head (4) towards the head (2).
A tool is formed in one piece, suitably from resilient plastics material and comprises a first head (2) from which extend a pair of divergent handles (12, 14) having at their free ends respective resilient beams (16, 18) extending inwardly towards the head (2). The beams (16, 18) at their convergent ends are joined with a head (4) spaced from the head (2), and are arcuately convex towards each other. On pivotal closure of the tool by bending of the arms (12, 14), the beams (16, 18) progressively engage from their upper ends and drive the head (4) towards the head (2).
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, lo 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 axms 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
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, lo 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 axms 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
- 2 -~1~7582 9367 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 l;
Figure 4 is a section taken on the line 4 - 4 of Figure l;
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;
: 20 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.
:. 25 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 beIow surface 6. The surface : - 3 -1~4758Z 9367 6 is defined at the roof of a cavity in the first head 2 between side walls 8, 10 adapted slidably to recei~e 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 arms 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.
In operation, 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, not shown, 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.
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 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.
In operation 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.
In the embodiment of Figures 7 and 8, in which like .':
` ' . ' ~ ' 11~758Z 9367 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 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.
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 4C, 2B on opening of the tool handles.
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 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.
.` ' ~ ' . .
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 l;
Figure 4 is a section taken on the line 4 - 4 of Figure l;
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;
: 20 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.
:. 25 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 beIow surface 6. The surface : - 3 -1~4758Z 9367 6 is defined at the roof of a cavity in the first head 2 between side walls 8, 10 adapted slidably to recei~e 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 arms 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.
In operation, 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, not shown, 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.
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 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.
In operation 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.
In the embodiment of Figures 7 and 8, in which like .':
` ' . ' ~ ' 11~758Z 9367 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 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.
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 4C, 2B on opening of the tool handles.
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 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.
.` ' ~ ' . .
Claims (7)
1. 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, in which 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.
2. A tool as claimed in Claim 1, in which the beams are arcuately convex away from their respective arms.
3. A tool as claimed in Claim 1, in which the arms are flexible relative to the head on closure of the arms together to obtain the pivotal action by bending of the arms.
4. A tool as claimed in Claim 1, in which the first head is formed with a recess between the arms and adapted slidably to receive the second head on closure of the arms, the second head being spaced from the first head when the arms are in an open condition.
5. A tool as claimed in Claim 1, in which the second head is formed between the beams with a recess having a restricted lower entry between the beams, a support rail having an enlarged head portion engaging the recess with the rail extending between the beams such that on closure of the arms together, the beams progressively flatten against opposite sides of the rail.
6. A tool as claimed in Claim 4, in which the second head is formed with an extension slidably overlapping the first head portion and formed with a third head portion spaced from the first head portion on a side remote from the second head portion.
7. A tool as claimed in Claim 4, in which the second head portion is formed with an extension projecting through an aperture in the first head portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13703580A | 1980-04-03 | 1980-04-03 | |
| US137,035 | 1980-04-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1147582A true CA1147582A (en) | 1983-06-07 |
Family
ID=22475530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000373293A Expired CA1147582A (en) | 1980-04-03 | 1981-03-18 | 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) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3166322B2 (en) * | 1992-06-15 | 2001-05-14 | ソニー株式会社 | Playback method and playback device |
Family Cites Families (3)
| 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 |
| GB1427397A (en) * | 1973-04-24 | 1976-03-10 | Ici Ltd | Forceps |
-
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 DE DE8181301248T patent/DE3161923D1/en not_active Expired
- 1981-03-24 AT AT81301248T patent/ATE5861T1/en not_active IP Right Cessation
- 1981-03-24 EP EP81301248A patent/EP0037673B1/en not_active Expired
- 1981-03-24 ES ES1981267154U patent/ES267154Y/en not_active Expired
- 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 JP JP4733181A patent/JPS56152586A/en active Granted
- 1981-04-01 MX MX186658A patent/MX153247A/en unknown
- 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
Also Published As
| Publication number | Publication date |
|---|---|
| AU6829381A (en) | 1981-10-08 |
| ES267154U (en) | 1983-11-01 |
| EP0037673B1 (en) | 1984-01-18 |
| AR224190A1 (en) | 1981-10-30 |
| EP0037673A1 (en) | 1981-10-14 |
| MX153247A (en) | 1986-09-02 |
| HK26787A (en) | 1987-04-10 |
| DE3161923D1 (en) | 1984-02-23 |
| YU85681A (en) | 1983-06-30 |
| JPS64191B2 (en) | 1989-01-05 |
| ES267154Y (en) | 1984-05-01 |
| AU539722B2 (en) | 1984-10-11 |
| BR8101947A (en) | 1981-10-06 |
| ATE5861T1 (en) | 1984-02-15 |
| JPS56152586A (en) | 1981-11-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |