GB2429257A - An anti-vibration unit for a petrol impact wrench and an impact wrench incorporating such a unit - Google Patents

An anti-vibration unit for a petrol impact wrench and an impact wrench incorporating such a unit Download PDF

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Publication number
GB2429257A
GB2429257A GB0517096A GB0517096A GB2429257A GB 2429257 A GB2429257 A GB 2429257A GB 0517096 A GB0517096 A GB 0517096A GB 0517096 A GB0517096 A GB 0517096A GB 2429257 A GB2429257 A GB 2429257A
Authority
GB
United Kingdom
Prior art keywords
unit
pair
vibration
handle
roll cage
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.)
Withdrawn
Application number
GB0517096A
Other versions
GB0517096D0 (en
Inventor
Victor Campbell Archer
Lloyd Andrew Storey
Michael John Kaye
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.)
BRYAR GROUP Ltd
Original Assignee
BRYAR GROUP 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 BRYAR GROUP Ltd filed Critical BRYAR GROUP Ltd
Priority to GB0517096A priority Critical patent/GB2429257A/en
Publication of GB0517096D0 publication Critical patent/GB0517096D0/en
Publication of GB2429257A publication Critical patent/GB2429257A/en
Withdrawn legal-status Critical Current

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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/373—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by having a particular shape
    • F16F1/3732—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by having a particular shape having an annular or the like shape, e.g. grommet-type resilient mountings
    • F16F1/3735—Multi-part grommet-type resilient mountings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/42—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by the mode of stressing
    • F16F1/44—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by the mode of stressing loaded mainly in compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

An anti-vibration unit 1 for use with a petrol impact wrench 25, comprises a metallic body member 2 provided at opposite ends with flanges 3, 6, and a pair 10 of spaced-apart side plates projecting from opposite sides of the unit 1, with a first plate 11 of each pair attached to the unit 1, and the second side plate 13 of each pair including an aperture for connection to a portion of a roll cage handle 15 of a petrol impact wrench. Each pair 10 pf side plates is provided with at least one coaxial hole to receive a common connecting bolt 16, with a first, coaxial, anti-vibration bush 19 mounted on the bolt 16 between mutually facing, interior surfaces of each pair 10 of side plates, and a second anti-vibration bush 22 mounted on the outside of the side plate of each pair 10 that is connected to the unit 1.

Description

Title of the Invention
Petrol impact wrench etc.
Field of the Invention
This invention relates to an anti-vibration insert for use with a petrol impact wrench and to a petrol impact wrench provided with such an insert.
Background of the Invention
Petrol impact wrenches are known comprising a motor unit flange jointed to a gear box, the latter being flange jointed to an impact unit which terminates in a drive shaft, usually a square section, on to which may be fitted a suitable sized socket etc for use in nut and bolt fitting and removal. Such wrenches find extensive use in the railway industry for the trackside fitting and removal of studs, nuts and bolts e.g. attaching rail chairs to sleepers.
Conventional petrol impact wrenches comprise a roll cage handle to be gripped by the user at the most convenient location to hold the wrench at the required angular position, the roll cage handle being of tubular construction and mounted on the gearbox or motor housing. Such mounting subjects the handle to operational vibrations transmitted from the impact unit to the gearbox and then to the motor unit.
The handle is consequently provided with an anti-vibration covering e.g. of resilient plastics/rubber/foam material, to minimise the transmission of vibrations to the hands of the user. Despite these precautions it is only possible to operate such a wrench for a maximum of eight minutes in the UK, in accordance with HSE regulations. This results in the need to provide multiple operators for relatively uninterrupted use of the impact wrench and/or significant rest periods during which the fitting or removal of nuts and bolts cannot be effected.
Object of the Invention A basic object of the invention is the provision of an insert that may be retro- fitted to existing impact wrenches, as well as fitted to new impact wrenches that considerably reduces the vibrations transmitted to the user, and hence extends the lawfully permitted periods of use.
Summary of a First Aspect of the Invention
According to a first aspect of the invention there is provided an antivibration unit adapted, in use, to be interposed between the gearbox and motor flanges of a conventional impact wrench, the unit comprising a metallic body member provided at opposite ends with flanges to match those of the gearbox and motor, a pair of spaced- apart side plates projecting from opposite sides of the unit, with a first side plate of each pair attached to the unit, and the second side plate of each pair apertured for connection, in use, to a portion of a roll cage handle of the petrol impact wrench, with each pair of side plates provided with at least one coaxial hole to receive a common connecting bolt, with a first, coaxial, anti-vibration bush mounted on the bolt between mutually facing, interior surfaces of each pair of side plates, and a second, anti- vibration bush mounted on the outside of the side plate of each pair that is connected to the unit.
Summary of a Second Aspect of the Invention
According to a second aspect of the invention there is provided a petrol impact wrench comprising a motor unit, a gearbox, and a drive unit all located along a longitudinal drive axis, the unit being provided with a roll cage handle, and an anti- vibration unit in accordance with the first aspect interposed between a flange of the motor unit and an adjacent flange of the gearbox, whereby the roll cage handle is connected to, and mounted on, a portion of the anti-vibration unit.
Advantages of the Invention With the anti-vibration unit and petrol impact wrench in accordance with the two aspects of the invention, the roll cage handle is no longer mounted on the gearbox or motor housing and hence subjected to vibrations transmitted from the impact unit to the gearbox to the handle, but on the contrary is mounted on, and carried by, the antivibration unit resulting in a substantial reduction of vibrations transmitted to the handle, such that operational times may safely be at least doubled beyond that of prior art machines, resulting in increased operational periods and more efficient use of petrol impact wrenches, as well as minimised vibration transmission to the user.
Preferred or Optional Features Each pair of side plates is provided with two coaxial holes and hence two pairs of anti-vibration bushes.
Each side plate is generally trapezoidal, with each shorter side being provided with multiple bolt holes for the first side plate of each pair to be bolted to the unit and the second side plate of each pair to be bolted to a mounting bracket of the roll cage handle.
The roll cage handle comprises a non-circular looped portion in a plane orthogonal to the longitudinal drive axis.
A U-shaped top handle is attached to the roll cage handle in a plane orthogonal to that of the roll cage handle.
The top handle is tubular.
The top handle is provided with an anti-vibration covering of rubber/plastics/foam etc.
Brief Description of the Drawings
* Brief Description of the Drawings
In the accompanying drawings: Figure 1 is a perspective view of an antivibration unit in accordance with the first aspect; Figure 2 is a section through one of the four anti-vibration bushes and bolts of the unit of Figure 1; Figure 3 is a perspective view from one side of a portion of a petrol impact wrench in accordance with the second aspect of the invention; Figure 4 corresponds to Figure 3, but from the other side; and Figure 5 is a plan view of the wrench of Figures 4 and 5.
Detailed Description of the Drawings
In Figures 1 and 2, an anti-vibration unit 1 in accordance with the first aspect of the invention comprises a metallic body member 2 provided at one end with a flange 3 having tapped holes in six wings 4 to receive a securing stud 5 (see Figures 3, 4 and 5). At its other end, the body member 2 is provided with another flange 6 provided with four through holes 7 through which pass bolt stems 8 (Figures 3, 4 and 5) each to receive a nut 9.
From opposite sides of the unit 1 project a pair 10 of spaced-apart side plates, a first side plate 11 of each pair 10 being secured by three fasteners 12 to the body member 2, whilst a second side plate 13 of each pair 10 is adapted to be secured by three fasteners 14 to a roll cage handle 15 (Figures 3, 4 and 5) as will be described in detail later.
Each pair 10 of side plates is provided with two coaxial holes to receive a connecting bolt 16 secured by a nut 1. and washer 18.
As best seen in Figure 2, between each pair of plates, and coaxial with each bolt 16, is a first anti-vibration bush 19 e.g. of synthetic rubber, the bush 19 engaging opposed inner surfaces 20 of each pair 10 of plates.
The washer 18 bears on an enlarged head 21 of a second anti-vibration bush 22 which is also coaxial with the bolt 16 and which engages an outer surface 23 of each first side plate 11. The bush 23 has an integral tubular portion 24 surrounding a portion of the stem of bolt 16 and passing through the first bush 19, as far as the inner surface 22 of the second side plate 13.
In Figures 3, 4 and 5, is illustrated (most) of a petrol impact wrench 25, comprising a motor unit 26, a gearbox 27, and an impact unit 28 having a common longitudinal axis 29.
The three fasteners 14 of each second side plate 13 are secured by bolts and/or studs to one of a pair of brackets 30 of the roll cage handle 15, the brackets 30 being spaced apart and located to opposite sides of the motor unit 26, and the roll cage handle 15 being located in a plane orthogonal to the longitudinal axis 29.
Opposite sides of the roll cage handle 15 are also provided with second brackets 31 which serve to support an inverted U-shaped handle 32. Portions of both the roll cage handle 15 and the U-shaped handle 32 are provided with a vibration absorbent covering 33 e.g. of a foam material.
Consequently, the roll cage handle 15 and the U-shaped handle 32 are attached to the petrol impact wrench 25 via the anti-vibration unit 1, in contrast to prior art petrol impact wrenches where vibrations are transmitted to the handle.
In addition, an auxiliary handle 34 provided with a vibration absorbent covering is attached to adjacent flanges 36 of the gearbox 25 and impact unit 28, principally to aid the lifting and carrying of the wrench 25 to site.

Claims (10)

1. An anti-vibration unit adapted, in use, to be interposed between the gearbox and motor flanges of a conventional impact wrench, the unit comprising a metallic body member provided at opposite ends with flanges to match those of the gearbox and motor, a pair of spaced-apart side plates projecting from opposite sides of the unit, with a first side plate of each pair attached to the unit, and the second side plate of each pair apertured for connection, in use, to a portion of a roll cage handle of the petrol impact wrench, with each io pair of side plates provided with at least one coaxial hole to receive a common connecting bolt, with a first, coaxial, anti-vibration bush mounted on the bolt between mutually facing, interior surfaces of each pair of side plates, and a second, anti-vibration bush mounted on the outside of the side plate of each pair that is connected to the is unit.
2. A unit as claimed in Claim 1, wherein each pair of side plates is provided with two coaxial holes and hence two pairs of anti-vibration bushes.
3. A unit as claimed in Claim 1 or Claim 2, wherein each side plate is generally trapezoidal, with each shorter side being provided with multiple bolt holes for the first side plate of each pair to be bolted to the unit and the second side plate of each pair to be bolted to a mounting bracket of the roll cage handle.
4. A unit as claimed in any preceding Claim, wherein the roll cage handle comprises a non-circular looped portion in a plane orthogonal to the longitudinal drive axis.
5. A unit as claimed in any preceding Claim, wherein a u-shaped top handle is attached to the roll cage handle in a plane orthogonal to that of the roll cage handle.
6. A unit as claimed in Claim 5, wherein the top handle is tubular.
7. A unit as claimed in Claim 5 or Claim 6, wherein the top handle is provided with an anti-vibration covering of rubber/plastics/foam etc.
8. An anti-vibration unit substantially as herein before described with reference to the accompanying drawings.
9. A petrol impact wrench comprising a motor unit, a gearbox, and a drive unit all located along a longitudinal drive axis, the unit being provided with a roll cage handle, and an anti-vibration unit in accordance with any preceding claim interposed between a flange of the motor unit and an adjacent flange of the gearbox, whereby the roll cage handle is connected to, and mounted on, a portion of the anti-vibration unit.
10. A petrol impact wrench substantially as herein before described with reference to the accompanying drawings.
GB0517096A 2005-08-20 2005-08-20 An anti-vibration unit for a petrol impact wrench and an impact wrench incorporating such a unit Withdrawn GB2429257A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0517096A GB2429257A (en) 2005-08-20 2005-08-20 An anti-vibration unit for a petrol impact wrench and an impact wrench incorporating such a unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0517096A GB2429257A (en) 2005-08-20 2005-08-20 An anti-vibration unit for a petrol impact wrench and an impact wrench incorporating such a unit

Publications (2)

Publication Number Publication Date
GB0517096D0 GB0517096D0 (en) 2005-09-28
GB2429257A true GB2429257A (en) 2007-02-21

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GB0517096A Withdrawn GB2429257A (en) 2005-08-20 2005-08-20 An anti-vibration unit for a petrol impact wrench and an impact wrench incorporating such a unit

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107124065A (en) * 2016-02-25 2017-09-01 博西华电器（江苏）有限公司 Motor
IT202100005933A1 (en) * 2021-03-12 2022-09-12 Cembre Spa IMPACT SCREWDRIVER

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0246212A2 (en) * 1986-05-12 1987-11-19 Eskil Sundström Protection against vibrations at a motor driven vibration generating handtool
US20020011343A1 (en) * 2000-07-31 2002-01-31 Giichi Iida Vibration-isolating member and vibration-isolating device
GB2418000A (en) * 2004-09-13 2006-03-15 Belle Engineering Mounting apparatus for mounting a power unit on a body and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0246212A2 (en) * 1986-05-12 1987-11-19 Eskil Sundström Protection against vibrations at a motor driven vibration generating handtool
US20020011343A1 (en) * 2000-07-31 2002-01-31 Giichi Iida Vibration-isolating member and vibration-isolating device
GB2418000A (en) * 2004-09-13 2006-03-15 Belle Engineering Mounting apparatus for mounting a power unit on a body and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107124065A (en) * 2016-02-25 2017-09-01 博西华电器（江苏）有限公司 Motor
IT202100005933A1 (en) * 2021-03-12 2022-09-12 Cembre Spa IMPACT SCREWDRIVER
EP4056326A1 (en) * 2021-03-12 2022-09-14 CEMBRE S.p.A. Impact wrench
WO2022190025A1 (en) * 2021-03-12 2022-09-15 Cembre S.P.A. Impact tool

Also Published As

Publication number Publication date
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