GB2122125A - Shear apparatus - Google Patents

Shear apparatus Download PDF

Info

Publication number
GB2122125A
GB2122125A GB08315702A GB8315702A GB2122125A GB 2122125 A GB2122125 A GB 2122125A GB 08315702 A GB08315702 A GB 08315702A GB 8315702 A GB8315702 A GB 8315702A GB 2122125 A GB2122125 A GB 2122125A
Authority
GB
United Kingdom
Prior art keywords
attachment
member
jaw
provided
arm
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
Application number
GB08315702A
Other versions
GB8315702D0 (en
GB2122125B (en
Inventor
Raymond Pardoe
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.)
DUDLEY SHEARING MACHINE Manufacturing CO Ltd
Original Assignee
DUDLEY SHEARING MACHINE Manufacturing CO 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
Priority to GB8217842 priority Critical
Application filed by DUDLEY SHEARING MACHINE Manufacturing CO Ltd filed Critical DUDLEY SHEARING MACHINE Manufacturing CO Ltd
Priority to GB08315702A priority patent/GB2122125B/en
Publication of GB8315702D0 publication Critical patent/GB8315702D0/en
Publication of GB2122125A publication Critical patent/GB2122125A/en
Priority claimed from GB08509862A external-priority patent/GB2157215A/en
Publication of GB2122125B publication Critical patent/GB2122125B/en
Application granted granted Critical
Application status is Expired legal-status Critical

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F3/00Dredgers; Soil-shifting machines
    • E02F3/04Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/96Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/965Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of metal-cutting or concrete-crushing implements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23DPLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D17/00Shearing machines or shearing devices cutting by blades pivoted on a single axis
    • B23D17/02Shearing machines or shearing devices cutting by blades pivoted on a single axis characterised by drives or gearings therefor
    • B23D17/06Shearing machines or shearing devices cutting by blades pivoted on a single axis characterised by drives or gearings therefor actuated by fluid or gas pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23DPLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D23/00Machines or devices for shearing or cutting profiled stock

Abstract

A shear attachment is provided with fixing means so that it can be replaceably mounted in place of a bucket on the end of an arm of an excavator, the attachment comprising a pair of co-operating shearing jaw members 10, 16, one of which has means, as shown a bracket 44, for attachment to the arm of the excavator and carries a piston and cylinder device 35 for actuating the other jaw member 16. <IMAGE>

Description

SPECIFICATION Shear apparatus The invention relates to apparatus for shearing or cutting tough materials, such as metals, particularly but not exclusively steel, the apparatus being mounted in use on an hydraulically-powered arm of an excavating vehicle. The term "excavating vehicle" as used herein means a vehicle having wheels or which is track-laying having an arm of one or more articulated portions, said arm being powered wholly or partially by hydraulic power and usually having mounted at an extremity of the arm a bucket for earth excavation or some other tool for example a pneumatic or hydraulic percussion device or means for manipulating objects such as telegraph poles, posts and the like.

It is known to provide an arm on an excavating vehicle having a scrap shear provided thereon, the scrap shear being a part of the arm and not being transferable to another vehicle. Such shears have been expensive and because they have incorporated at least two and often more hydraulic rams to hold the scrap and cut it, they are extremely heavy requiring a large vehicle for stability.

The present invention seeks to provide a lightweight simple shear for attachment to and transfer between existing vehicles yet which is powerful enough to cut substantial thicknesses of material. The invention also seeks to provide a vehicle having fitted thereto such a shear.

The invention provides therefore a shear attachment adapted for attachment to an arm of an excavating vehicle, comprising a first member having a jaw on an end thereof and having remote from said jaw fixing means by which the first member may be mounted on the said arm, a second member movably mounted on said first member and having a jaw co-operable with the jaw of said first member, and an hydraulic piston and cylinder assembly mounted on one of said first and second members and connected to the other of said first and second members and operable to cause relative shearing movement between said jaws.

Preferably the second member is pivotally mounted on the first member.

Desirably the jaw of the first member comprises a pair of spaced apart jaw elements, the jaw of the second member being movable, in use, into or out of the said space.

Extremities of each jaw element may be joined together by a reinforcing member.

Preferably at least one of said pair of jaw elements and the jaw of the second member are provided with blades of hardened steel by which cutting is accomplished.

In a preferred arrangement the pivot between the first and second member is located near the jaws and the jaws are so shaped that during shearing an object being sheared is urged by the jaws in a direction generally away from the extremities of the jaws and generally towards the said pivot. To effect this, each jaw is preferably generally shaped so that the space between the jaws, as they initially meet, is wider towards the pivot than it is at the tips of the jaws.

One or both jaws may be provided with one or more grooves or recesses for gripping elements being sheared.

One of the jaw elements may be set back relative to the other jaw element in the direction of penetration of the jaw of the second member so that during shearing the said other jaw element comes into shearing co-operation with the jaw of the second member before the set back jaw element.

Preferably the cylinder of the piston and cylinder device is mounted for limited pivotal movement on the first member at a point between the ends of said member and the piston is pivotally connected at its end to the second member.

The fixing means desirably comprises a pair of pivotal mountings, one of said mountings being co-operable with the mounting provided on an arm of said vehicle which is usually fitted with an excavating bucket, the second of said mountings being co-operable with the mounting provided on the piston or cylinder of an excavating-buckettilting ram provided on said arm. A plurality of fixing means may be provided to allow the attachment to be transferred from one vehicle to another, different vehicle, having different fixings.

The hydraulic piston and cylinder device provided on the attachment is preferably driven by the hydraulic compressor of the vehicle to which it is, in use, attached.

Preferably the first member is fabricated and a portion thereof remote from the jaws is hollow.

An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings, in which~ Fig. 1 is a perspective view of a shear attachment; Fig. 2 is a partial cross-section on line Il-Il of Fig. 1; Fig. 3 is a schematic side elevation on a reduced scale of an excavating vehicle having fitted thereto a shear attachment according to the invention; and Fig. 4 is a view similar to Fig. 3, showing an excavating vehicle having a modified shear attachment fitted thereto.

The attachment shown in the figures comprises a first member 10 comprising two frame members 12 assembled such that at their forward ends they are in spaced relationship with a gap therebetween. The rear portions of the members 12 are conveniently manufactured from a material whose thickness is less than said forward ends, for weight reduction purposes, and are assembled together with cross plates to form a hollow box structure. A pivot 14 is provided between the forward ends of the frame members 12 and on this is mounted a second member 16.

At a front region of the frame members 12 there are provided jaw elements 1 8a, 1 8b and a co operating jaw 20 is provided at a front region of the second member 1 6. During cutting the jaw 20 is received between the jaw elements 1 Sa, 1 Sb.

The cutting edges of the jaw elements 1 Sa, 1 8b and the jaw 20 each comprise two mutually inclined sections so that in the open position shown in Fig. 1 the space between them increases initially toward the pivot and thus closes towards the pivot. One face of the jaw 20 and the corresponding face of one of the elements 1 sub of the first member are provided with replaceable blades 22 of hard material fixed by known means to the jaws. The mounting of the second member 16 on the pivot 14 is such that the member 16 can be adjusted laterally of the pivot axis towards or away from the element 1 sub.

At their forward end, the jaw elements 1 8a and 18b are joined together by a replaceable reinforcing plate 24 which serves to prevent wear of the jaw ends, for example when the jaws are moved amongst piles of scrap to find items to cut and to tie the elements together. The jaw element t8b having the blades 22 is the primary anvil jaw on the first member 10. The jaw element 18a is cut back as shown in Fig. 2 so that items to be cut engage and are sheared at the jaw element 18b the jaw element 18a during cutting, serving to inhibit the forcing apart laterally of the jaw element 18b and jawt20 by movement of an item being cut into a plane parallel to and between the plane in which the jaw 20 moves.A thrust plate 26 is provided on the jaw element 18a to direct the jaw 20 between the jaw elements 1 8a and 18b and to inhibit the lateralmovement as aforesaid.

The angular disposition of the cutting edges of element 1 sub and jaw 20 are such that when the edges come together at a point which progresses away from the pivot the angle between the cutting edges is of the order of 2 , that is the cutting edges are never parallel.

The jaw elements 1 8a and 18b are provided with recesses 28 (not shown in Fig. 3) to accept the flange of a channel section girder to be cut.

A cylinder 34 of a relatively short stroke hydraulic ram 35 is mounted by means of a beam 36 fixed to the cylinder between its ends for limited pivotal movement in a cradle 37 welded across the frame members 12, by means of trunnions 38. An end region of a piston 40 of the ram 35 is pivotally connected to a yoke 42 fixed to the second member 16 at one end thereof remote from the jaw 20. By adopting a short stroke cylinder and mounting it to the first member from a point between its ends the overall length of the shear is kept to a minimum and a fast operating cycle is achieved. The length of the piston 40 and the distance between the yoke 42 and the pivot 14 are carefully selected so that as the jaws arrive at a cutting position the piston is substantially tangential to the arc defined by the yoke 42 as the member pivots about the axis 14.This means that the maximum force is transmitted to the jaws at the time of critical cutting.

Fixing means are provided for the fixing of the attachment to an excavating vehicle, these comprising a yoke 44 (only part of which is shown in Fig. 1) by means of which the attachment is pivotally mounted on the pivot 46 of an excavating vehicle provided for the excavating bucket. A further pivotal mounting 48 (not shown in Fig. 1 and shown in broken line in Fig. 3) is provided between the frame members 12 at an end thereof remote from the jaw elements 18a, 1 sub, this mounting being coupled in use to the piston of a bucket tilting ram 50 provided on the arm 52 of an excavating vehicle 54.

Various modifications may be made within the scope of the invention. For example several sets of fixing means similar to the yoke 44 may be provided (if they do not interfere with the operation of the attachment).

The recesses 28 may be omitted or of a shape different to those shown in the figures. More than one recess may be provided in the jaw elements 18a, or the jaw 20.

It should be realised that by providing the shear with its own jaw actuating ram and mounting this ram on the first member, rather than by utilising, say, the bucket operating ram of the excavator which is mounted on the excavator arm, a relatively compact, light weight and consequently inexpensive shear is provided in which all the shearing forces are resisted by the components of the shear and are not transmitted to the arm of the excavator.

The self-contained nature of the shear described above allows a further useful modification to be made. In this modification, which is illustrated in Fig. 4, the shear is mounted on the arm 52 for pivotting about an axis transverse to the pivot axis of the jaws. The fixing means comprises a mounting plate 58 pivotally mounted on the arm by fixings 46, 48 and pivotally supporting the attachment or pivot pins 60 whose axes are parallel to the longitudinal axis of the arm. A further ram 56 is connected between the shear attachment and the plate 58 to cause pivotal movement about the mounting pins 60 when desired. This means that the operation of the jaws is not restricted to movement in a substantially vertical plane, the jaws can operate at any angle making the attachment particularly suitable for cutting in situ vertically orientated items, for example posts, columns and stanchions.

Claims (16)

1. A shear attachment adapted for attachment to an arm of an excavating vehicle, comprising a first member having a jaw on an end thereof and having remote from said jaw fixing means by which the first member may be mounted on the said arm, a second member movably mounted on said first member and having a jaw co-operable with the jaw of said first member, and an hydraulic piston and cylinder assembly mounted on one of said first and second members and connected to the other of said first and second members and operable to cause relative shearing movement between said jaws.
2. An attachment as claimed in claim 1, in which the second member is pivotally mounted on the first member.
3. An attachment as claimed in claim 2, in which the second member is adjustable laterally relative to the first member.
4. An attachment as claimed in claim 1, 2 or 3, in which the jaw of the first member comprises a pair of spaced apart jaw elements, the jaw of the second member being movable, in use, into or out of the space between the elements.
5. An attachment as claimed in claim 4, in which the outer ends of each jaw element are connected by a reinforcing member.
6. An attachment as claimed in claim 4 or claim 5, in which at least one of said pair of jaw elements and the jaw of the second member are provided with blades of hardened steel by which cutting is accomplished.
7. An attachment as claimed in any one of the preceding claims, in which the pivot between the first and second members is located near the jaws and the jaws are so shaped that during shearing an object being sheared is urged by the jaws in a direction generally away from the extremities of the jaws and generally towards the said pivot.
8. An attachment as claimed in any one of the preceding claims, in which one or both jaws are provided with one or more grooves or recesses for gripping elements being sheared.
9. An attachment as claimed in any one of claims 3 to 8, in which one of the jaw elements is set back relative to the other jaw element in the direction of penetration of the jaw of the second member so that during shearing the said other jaw element comes onto co-operation with the jaw of the second member before the set back jaw element.
10. An attachment as claimed in any one of the preceding claims, in which the cylinder of the piston and cylinder device is mounted for limited pivotal movement on the first member at a point between the ends of the said cylinder and the piston is pivotally connected at its end to the second member.
11. An attachment as claimed in any one of the preceding claims, in which the fixing means comprises a pair of pivotal mountings, one of said mountings being co-operable with the mounting provided on an arm of said vehicle which is usually fitted with an excavating bucket, the second of said mountings being co-operable with the mounting provided on the piston or cylinder of an excavating-bucket-tilting ram provided on said arm.
12. An attachment as claimed in any one of the preceding claims, in which the fixing means comprises a pair of pivotal mountings, one of said mountings being co-operable with the mounting provided on an arm of said vehicle which is usually fitted with an excavating bucket, the second of said mountings being cooperable with the mounting provided on the piston or cylinder of an excavating-bucket-tilting ram provided on said arm and includes a mounting plate in which the attachment is mounted for pivotal movement about an axis parallel to the longitudinal axis of the attachment.
13. An attachment as claimed in claim 11 or claim 12, in which a plurality of fixing means are provided to allow the attachment to be transferred from one vehicle to another, different vehicle, having different fixings.
14. An attachment as claimed in any one of the preceding claims, in which the first member is fabricated and a portion thereof remote from the jaw elements is of hollow box construction.
15. A shear attachment substantially as hereinbefore described with reference to the accompanying drawings.
16. Any novel subject matter or combination including novel subject matter herein disclosed, whether or not within the scope of or relating to the same invention as any of the preceding claims.
GB08315702A 1982-06-19 1983-06-08 Shear apparatus Expired GB2122125B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8217842 1982-06-19
GB08315702A GB2122125B (en) 1982-06-19 1983-06-08 Shear apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08315702A GB2122125B (en) 1982-06-19 1983-06-08 Shear apparatus
GB08509862A GB2157215A (en) 1983-06-08 1985-04-17 Shear apparatus

Publications (3)

Publication Number Publication Date
GB8315702D0 GB8315702D0 (en) 1983-07-13
GB2122125A true GB2122125A (en) 1984-01-11
GB2122125B GB2122125B (en) 1986-12-31

Family

ID=26283148

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08315702A Expired GB2122125B (en) 1982-06-19 1983-06-08 Shear apparatus

Country Status (1)

Country Link
GB (1) GB2122125B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218899A2 (en) * 1985-09-14 1987-04-22 Helmut Wack Demolition scissors
GB2183193A (en) * 1985-11-25 1987-06-03 Allied Gator Inc Metal cutting shear and adapter for mounting on a backhoe
GB2189420A (en) * 1986-04-25 1987-10-28 Allied Gator Inc Metal cutting shear for a backhoe
US4838493A (en) * 1988-06-10 1989-06-13 Labounty Kenneth R Concrete crusher
US4908946A (en) * 1988-10-06 1990-03-20 Labounty Roy E Wood cutting shear
WO1991007082A1 (en) * 1989-11-10 1991-05-30 Crab Grab Logging Systems Pty. Ltd. Cutting mechanism for log forks
US5142779A (en) * 1991-12-02 1992-09-01 Labounty Manufacturing, Inc. Mobile wood and tire shear
USRE35432E (en) * 1989-12-15 1997-01-28 Labounty Manufacturing Co. Demolition tool for a hydraulic excavator
GB2378914A (en) * 2001-05-11 2003-02-26 Brian Purser Breaking apparatus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218899A2 (en) * 1985-09-14 1987-04-22 Helmut Wack Demolition scissors
EP0218899A3 (en) * 1985-09-14 1987-05-06 Helmut Wack Demolition scissors
GB2183193A (en) * 1985-11-25 1987-06-03 Allied Gator Inc Metal cutting shear and adapter for mounting on a backhoe
GB2183193B (en) * 1985-11-25 1989-12-28 Allied Gator Inc Metal cutting shear and adapter for mounting on a backhoe
GB2189420A (en) * 1986-04-25 1987-10-28 Allied Gator Inc Metal cutting shear for a backhoe
US4838493A (en) * 1988-06-10 1989-06-13 Labounty Kenneth R Concrete crusher
US4908946A (en) * 1988-10-06 1990-03-20 Labounty Roy E Wood cutting shear
WO1991007082A1 (en) * 1989-11-10 1991-05-30 Crab Grab Logging Systems Pty. Ltd. Cutting mechanism for log forks
USRE35432E (en) * 1989-12-15 1997-01-28 Labounty Manufacturing Co. Demolition tool for a hydraulic excavator
US5142779A (en) * 1991-12-02 1992-09-01 Labounty Manufacturing, Inc. Mobile wood and tire shear
GB2378914A (en) * 2001-05-11 2003-02-26 Brian Purser Breaking apparatus
GB2378914B (en) * 2001-05-11 2004-12-15 Brian Purser Breaking apparatus
US7025240B2 (en) 2001-05-11 2006-04-11 Brian Purser Apparatus and method for breaking rails

Also Published As

Publication number Publication date
GB8315702D0 (en) 1983-07-13
GB2122125B (en) 1986-12-31

Similar Documents

Publication Publication Date Title
EP0435702B1 (en) Demolition tool for a hydraulic excavator
DE60021539T2 (en) Scrap shredding device with interchangeable shear afford and breaking teeth
US4881867A (en) Excavator attachment
US20030147700A1 (en) Device and method for trenchless replacement of underground pipe
US5704560A (en) Concrete crusher with cutting shears
CA1183105A (en) Quick release and attachment assembly
US5350250A (en) Quick coupling of a front work attachment on excavators
AU2005334108B2 (en) Excavator demolition attachment with interchangeable jaw assemblies
US7014385B2 (en) Attachment coupling device for heavy machinery
USRE45341E1 (en) Replaceable demolition shear piercing tip
CA2002967C (en) Metal cutting shear with changeable multiple cutting edge portions
US8245964B2 (en) Dual moving jaws for demolition equipment
US5139006A (en) Hydraulic concrete pile cutter
US4951886A (en) Concrete crusher
US8146256B2 (en) Metal demolition shears with indexable, integrated wear plate/piercing tip
EP0404229B1 (en) Device for breaking objects consisting of concrete or similar material
US4776093A (en) Metal demolition shears
EP0596285B1 (en) Reinforced steel shear
US3778111A (en) Ripper tooth attachment for a backhoe
CA1297086C (en) Concrete crusher
US2332561A (en) Material handling apparatus
US4973028A (en) Rescue tool jaw
US6926217B1 (en) Heavy-duty demolition apparatus with replaceable tip and rotatable cross blade
US4693404A (en) Mains bursting tool
US4519135A (en) Metal demolition shear

Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20020608