GB2207880A - Apparatus for striking a material - Google Patents

Apparatus for striking a material Download PDF

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Publication number
GB2207880A
GB2207880A GB08817089A GB8817089A GB2207880A GB 2207880 A GB2207880 A GB 2207880A GB 08817089 A GB08817089 A GB 08817089A GB 8817089 A GB8817089 A GB 8817089A GB 2207880 A GB2207880 A GB 2207880A
Authority
GB
United Kingdom
Prior art keywords
striker
tube
bar
support member
tyre
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Withdrawn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
GB08817089A
Other versions
GB8817089D0 (en
Inventor
Albert Edward Dowdeswell
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB8817089D0 publication Critical patent/GB8817089D0/en
Publication of GB2207880A publication Critical patent/GB2207880A/en
Withdrawn legal-status Critical Current

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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
    • E02F3/966Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of hammer-type tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/28Supports; Devices for holding power-driven percussive tools in working position
    • B25D17/32Trolleys
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/12Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor
    • E01C23/122Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus
    • E01C23/124Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus moved rectilinearly, e.g. road-breaker apparatus with reciprocating tools, with drop-hammers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • General Engineering & Computer Science (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

Apparatus for striking a material comprises a square support tube 13 adapted to be moved by boom 16 of a hydraulic excavator towards and away from the material (e.g. concrete). An elongate striker bar 17 is mounted in the tube 13 for striking the material and is axially slidable in the tube 13 during downward movement thereof so that once the tube 3 has stopped moving downwardly, the bar 17 will continue downwards under gravitational force and strike the material. Force transmitted through a tube plate, a tyre and a bar plate 30 can move the bar 17 downwards before the tube 13 stops moving downwardly. A spring acting between the tube and the bar may too assist such movement. The bar 17 is raised by plate 13 cooporating with tyre 22 (shock absorber) and plate 19 of bar 17. A guard 41 may be provided around the tyres 22. The striker may include a removal striking part 34 having desired tip shapes. The tube 13 may include internal wear plates to engage bar 17. A lubricant may be used on bar 17. <IMAGE>

Description

APPARATUS FOR STRIKING A MATERIAL The invention relates to apparatus for striking a material and is particularly but not exclusively for use in breaking up a solid material such as a layer of concrete on the ground.
Concrete layers forming paving or roads occasionally need to be removed fully or partially to enable examination work, such as trench digging, to be carried out. Such layers can be difficult to break up even with a pneumatically powered impact chisel. An object of the present invention is to provide apparatus which will assist considerably in the breaking up of solid material such as a layer of concrete.
According to the invention there is provided apparatus for striking a material comprising a support member movable towards and away from the material and an elongate striker member mounted on the support for striking the material, the striker member being axially slidable relative to the support member during at least part of the movement of the support member.
Such apparatus is of simple construction and yet is effective in use.
The striker member may move downwardly to strike the material. The speed of downward movement of the support member towards the material is preferably greater than the speed at which the striker member moves downwardly under gravitational force alone.
The movement of the support member towards the material may be transmitted to the striker member through a drive member. In this way the striker member may be accelerated towards the material, rather than relying upon gravity and the apparatus may be used to strike in directions other than downwardly. The drive member preferably comprises a laterally extending member provided on the striker member. The movement may be transmitted through a drive member and shock absorbing means. The shock absorbing means may comprise at least one tyre.
Preferably barrier means are provided around the tyre or tyres for preventing injury of damage if the or a tyre should burst.
The movement of the support member towards the material may be transmitted through biasing means arranged to resiliently bias the striker member towards the material. The biasing means preferably comprises a spring. Thus, the spring may further act to accelerate the striker member towards the material. Preferably, the spring is helical and surrounds the striker member.
The movement of the support member away from the material may be transmitted to the striker member through a lift member. The lift member preferably comprises a laterally extending member provided on the striker member. The movement may be transmitted through a lift member and shock absorbing means. The shock absorbing means may comprise at least one tyre.
Preferably barrier means is provided around the tyre or tyres for preventing injury or damage if the or a tyre should burst.
Preferably, the part of the striker member which is arranged to strike the material is removable. Thus, the striking part of the striker member may be replaced if it is damaged or worn out, or different striking parts may be used for different applications.
For example, a flat ended part may be used in applications such as the breaking up of a concrete layer, or a flat ended part.may be used in such application as the flattening or compacting of loose material such as soil.
The support member preferably comprises a tube in which the striker member is axially slidable. The support member may comprise a square cross section tube. The striker member may comprise a circular cross section bar.
The support member may include wear elements provided on those parts of the support member which are arranged to engage the striker member. Thus, only the wear elements of the support member need be adapted for use under friction.
The apparatus preferably includes lubricating means for lubricating the surfaces of the support member and strike member where they are arranged to engage. The lubricating means may comprise a lubricant reservoir having at least one outlet means for lubricant. The lubricating reservoir is preferably provided on the striker member. In the case where the striker member is a circular cross section tube, preferably the striker member is free to rotate about its axis and only one outlet means is provided.
The moving means may comprise the boom of a hydraulic digger.
The support member preferably includes a plurality of sleeves provided in laterally opposed positions, each sleeve being arranged to receive a securing member which is adapted to be connected to the moving means.
The securing members may be plates. In this way the apparatus may readily be mounted on a number of different means, so that, for example, where the moving means comprises the boom of a hydraulic digger, the apparatus may readily be fitted to a hydraulic digger from any manufacturer. This is in contradistinction with known hydraulically driven concrete breakers which generally require extensive adaptation of the boom of the hydraulic digger to which they are fitted.
Three embodiments of the invention will now be described by way of example and with reference to the accompanying drawings, in which: Fig. 1 is an elevation of the first embodiment, Fig. 2 is a cross section on the line II-II in Fig. 1, Fig. 3 is an elevation of the second embodiment, Fig. 4 is a perspective view of the third embodiment.
Fig. 5 is a cross section on VV in Fig. 4 In Fig. 1 the apparatus comprises a support 10 and a heavy striker-member 12. The support 10 is formed from a square cross-section tube 13 having a plate 14 at its upper end as viewed in Fig. 1. The tube 13 has mounting lugs 15 by means of which it can be attached to the boom 16 of a hydraulic excavator. The striker member 12 is an elongate bar 17 which may have a hardened striker tip 18 at its lower end. The bar 17 is freely axially slidable within the tube 13 and, if desired, the free sliding can be improved by using a lubricant such as P.T.F.E. based spray lubricant available under the name TRI-FLOW. If desired, the tube 13 could be provided with internal wear plates 13a for engagement with the bar, as shown in Fig. 2.
The bar 17 has a circular lifting plate 19 suitably secured to its upper end, eg by welding.
Shock absorbing elements such as tyres 22 are positioned around the bar 17 between the end plate 14 and lifting plate 19.
In use, the boom 16 is moved up and down over a surface 9 to be broken up. During upward movement of the boom, the tube 13 moves from the position shown in Fig. 1 relative to the bar,17 so as to sandwich the tyres 22 between the plates 14, 19. Continued upward movement causes the tube 13 to lift the bar 17 clear of the ground. After the bar 17 has been lifted sufficiently, the boom 16 is lowered at a speed greater than the speed at which the bar 17 would fall under the force of gravity. The tube 13 is lowered sufficiently to permit the bar 17 to slide downwards so that its tip 18 strikes the material to be broken up. The impact of the tip 18 (which may be chisel like) against a material such as a layer of concrete rapidly cracks the layer and the broken pieces of concrete can then easily be lifted.
The embodiment shown in,Fig. 2 is the same as that in Fig. 1 except that a driving plate 30 is secured to the bar 17 beneath the tube 13, the latter having an end plate 32 at its lower end. A shock absorbing element such as one or more tyres 33 is arranged between the plates 30, 32. During downward movement of the boom 16, the tube 13 drives the bar 17 downwardly, driving load being imparted through the end plate 32, tyre 33 and driving plate 30. Such an arrangement provides additional impact load at the tip 18 to improve the action of the apparatus to break up the surface 9.
Fig. 3 shows the third embodiment and the same reference numerals are used for equivalent features.
The embodiment is broadly similar to the first embodiment.
The striker member 12 includes a removable striking part 34 in the form of a blind sleeve fitting around the end of the striker member body and including a striking end 35.
The striking part 34 is held in place by the arangement shown in Fig. 5. Two pins 44 are received in opposing radial bores 45 in the bar 17. The pins 44 are surrounded by bushings 46 which may be made from plastics. The pins 44 are held in the bores 45 by cover plates 47 which are secured over the ends of the pins 44 by screws 48. The pins 44 include screw threaded axial bores 49 by means of which they can be withdrawn. The striking part 34 is arranged to fit over the bar 17 so that the end 18 of the bar 17 fits against the inner end of the striking part 34. Thus, the pins 44 are not subjected to shear loads. The removable striking part 34 may be chisel tipped or may be blunt or flat tipped depending upon its intended use. Other tip shapes may be used if desired.
A helical spring 36 is arranged around the striker member 18 and bears upon the upper surface of the striking part 34. A washer (not shown) is provided within the tube 13 and acts as an upper stop for the spring 36.
A plurality of slim rectangular sleeves 37 are secured on opposing sides of the tube 13, for example, by welding. The sleeves 37 receive securing plates 38.
The plates 38 are longer than the width of the tube 13. One end of each plate 38 is pivotally connected to the boom 16 of a hydraulic excavator. The opposite end includes an aperture 39 for a bolt 40 which extends through apertures 39 in opposing securing plates 38 so that the securing plates 38 equip the tube 13 securely. Each plate 38 includes a stop projection (not shown) on its inner surface which abuts the side of the tube 13 when the plate 38 is inserted into the sleeve 37.
A cylindrical guard 41 is mounted at the top of the support tube 13 on the plate 14 and constitutes the aforesaid barrier means. The guard 41 is of a suitable diameter that when the tyres 22 are sandwiched between the upper plate 14 of the tube 13 and the lifting plates 19 on the bar 17, the compressed tyres 22 do not touch the guard 41. If one of the tyres 22 should burst the guard 41 will prevent the bursting tyre 22 from causing damage or injury.
A reservoir 42 for lubricant, such as oil, is mounted on the lifting plates 19 and includes an outlet 43 extending downwardly through the plate 19. The outlet 43 allows the lubricant to drip or dribble out onto the bar 17.
In use, the boom is moved upwardly in the normal way, but when the boom is moved downwardly, the bar 17 moves up against the bias of the spring 36- and compresses the spring 36 completely. When the boom 16 is stopped, the momentum of the striker member 12 carries it downwards sliding through the tube 13 and the bar 17 is accelerated by gravitational force and the force from the spring 36 to strike the material beneath it.
As the striking member 12 is not secured against rotation about its axis, when the apparatus is used the striking member 12 will rotate, and in this way lubricant from the single lubricant outlet 43 will be spread by the tube 13 over the engagement surfaces of the striking member 12 and ,tube 13.
The tube 13 need not be connected to the hydraulic boom 16 in either of the manners shown, but may be connected in any suitable way.
The helical spring 36 may be replaced by any other suitable resilient biasing arrangement if desired.
The apparatus of the second and third embodiments need not be used to strike downwardly but may be used to strike horizontally or even upwardly.
Whilst specific reference has been made to the use of the apparatus in breaking up a solid material, it may be used in other applications, such as to flatten or compact soil or the like.

Claims (29)

1. Apparatus for striking a material comprising a support member adapted to be moved by moving means towards and away from the material and an elongate striker member mounted on the support member for striking the material, the striking member being axially slidable relative to the support member during part of the movement of the support member.
2. Apparatus as claimed in claim 1, wherein the striker member moves downwardly to strike the material.
3. Apparatus as claimed in claim 2, wherein the speed of downward movement of the support member is greater than the speed at which the striker member moves downwardly under gravitational force alone.
4. Apparatus as claimed in any preceding claim, wherein movement of the support member towards the material is transmitted to the striker member through a drive member.
5. Apparatus as claimed in claim 4, wherein the drive member comprises a laterally extending member provided on the striker member.
6. Apparatus as claimed in claim 4 or claim 5, wherein the movement is transmitted through a drive member and shock absorbing means.
7. Apparatus as claimed in claim 6, wherein the shock absorbing means comprises a least one tyre.
8. Apparatus as claimed in claim 7, wherein barrier means is provided around the tyre or tyres for preventing injury or damage if the or a tyre should burst.
9. Apparatus as claimed in claim 4 or 5 wherein the movement is transmitted through biasing means arranged to resiliently bias the striker member towards the material.
10. Apparatus as claimed in claim 9, wherein the biasing means comprises a spring.
11. Apparatus as claimed in claim 10, wherein the spring is helical and surrounds the striker member.
12. Apparatus as claimed in any preceding claim, wherein movement of the support member away from the material is transmitted to the striker member through a lift member.
13. Apparatus as claimed in claim 12, wherein the lift member comprises a laterally extending member provided on the striker member.
14. Apparatus as claimed in claim 12 or 13, wherein the said movement is transmitted through a lift member and shock absorbing means.
15. Apparatus as claimed in claim 14, wherein the shock absorbing means comprises at least one tyre.
16. Apparatus as claimed in claim 15, wherein barrier means is provided around the tyre or tyres for preventing injury or damage if the or a tyre should burst.
17. Apparatus as claimed in any preceding claim, wherein the part of the striker member which is arranged to strike the material is removable.
18. Apparatus as claimed in any preceding claim, wherein the support member comprises a tube in which the striker member is axially slidable.
19. Apparatus as claimed in any preceding claim, wherein the support member comprises a square cross section tube.
20. Apparatus as claimed in any preceding claim, wherein the striker member comprises a circular cross section bar.
21. Apparatus as claimed in any preceding claim, wherein the support member includes wear elements provided on those parts of the support member which are arranged to engage the striker member.
22. Apparatus as claimed in any preceding claim, wherein the apparatus includes lubricating means for lubricating the surfaces of the support member and strike member where they are arranged to engage.
23. Apparatus as claimed in claim 22, wherein the lubricating means comprises a- lubricant reservoir having at least one outlet means or lubricant.
24. Apparatus as claimed in claimed 23, wherein the lubricating reservoir is provided on the striker member.
25. Apparatus as claimed in claim 24, wherein, in the case where the striker member is a circular cross section bar, the striker member is free to rotate about its axis and only one outlet means is provided.
26. Apparatus as claimed in any preceding claim, wherein the moving means comprises the boom of a hydraulic digger.
27. Apparatus as claimed in any preceding claim, wherein the support member includes a plurality of sleeves provided in laterally opposed positions, each sleeve being arranged to receive a securing member which is adapted to be connected to the moving means.
28. Apparatus as claimed in claim 27, wherein the securing members are plates.
29. Apparatus for striking a material substantially as hereinbefore described with reference to Fig. 1, Fig. 3, or Fig.s 4 and 5 of the accompanying drawings.
GB08817089A 1987-07-16 1988-07-18 Apparatus for striking a material Withdrawn GB2207880A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB878716828A GB8716828D0 (en) 1987-07-16 1987-07-16 Striking material

Publications (2)

Publication Number Publication Date
GB8817089D0 GB8817089D0 (en) 1988-08-24
GB2207880A true GB2207880A (en) 1989-02-15

Family

ID=10620785

Family Applications (2)

Application Number Title Priority Date Filing Date
GB878716828A Pending GB8716828D0 (en) 1987-07-16 1987-07-16 Striking material
GB08817089A Withdrawn GB2207880A (en) 1987-07-16 1988-07-18 Apparatus for striking a material

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB878716828A Pending GB8716828D0 (en) 1987-07-16 1987-07-16 Striking material

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GB (2) GB8716828D0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0412203A1 (en) * 1989-08-11 1991-02-13 Nippon Pneumatic Manufacturing Co. Ltd. Cushioning device for impact tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106012786B (en) * 2016-05-31 2018-08-03 福州麦辽自动化设备有限公司 A kind of drill steel displacement trigger mechanism of quartering hammer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB538560A (en) * 1939-12-02 1941-08-08 John Earl Ransom Simons Improvements in or relating to hand or power hammers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB538560A (en) * 1939-12-02 1941-08-08 John Earl Ransom Simons Improvements in or relating to hand or power hammers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0412203A1 (en) * 1989-08-11 1991-02-13 Nippon Pneumatic Manufacturing Co. Ltd. Cushioning device for impact tool

Also Published As

Publication number Publication date
GB8716828D0 (en) 1987-08-19
GB8817089D0 (en) 1988-08-24

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)