EP0059071B1 - Strassendeckenaufbruchgerät - Google Patents

Strassendeckenaufbruchgerät Download PDF

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Publication number
EP0059071B1
EP0059071B1 EP82300822A EP82300822A EP0059071B1 EP 0059071 B1 EP0059071 B1 EP 0059071B1 EP 82300822 A EP82300822 A EP 82300822A EP 82300822 A EP82300822 A EP 82300822A EP 0059071 B1 EP0059071 B1 EP 0059071B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
handle
paving
apertures
muffler
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
Application number
EP82300822A
Other languages
English (en)
French (fr)
Other versions
EP0059071A1 (de
Inventor
David Thomson Allan
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.)
ALLAN, DAVID THOMSON
John MacDonald and Company Pneumatic Tools Ltd
Original Assignee
Allan David Thomson
John MacDonald and Company Pneumatic Tools 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 Allan David Thomson, John MacDonald and Company Pneumatic Tools Ltd filed Critical Allan David Thomson
Publication of EP0059071A1 publication Critical patent/EP0059071A1/de
Application granted granted Critical
Publication of EP0059071B1 publication Critical patent/EP0059071B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/11—Arrangements of noise-damping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/04—Handles; Handle mountings

Definitions

  • This invention relates to improvements in paving breakers.
  • Conventional paving breakers comprise a handle which includes an air supply control valve, a cylinder in which the operating piston reciprocates, and a front end which incorporates a chuck bushing and means for retaining the tool bit. Hitherto, bolts, studs or set pins have been used to attach the handle to the cylinder and the cylinder to the front end. Such arrangements suffer from the disadvantage that assembly and dismantling of the breaker involve complicated procedures.
  • the operating cylinder is attached to the handle by means of eccentric bolts 4 which pass through apertures formed in the handle and in the cylinder.
  • the bolts 4 by virtue of the relative positioning of the apertures in the handle and in the cylinder, are provided with a flattened portion which, when turned, serves to lock the cylinder and the handle together. It is a disadvantage of this arrangement that special bolts are required having the requisite flattened portion and that the apertures in the handle and cylinder require to be offset.
  • a paving breaker comprising a handle, a cylinder and a front end, wherein the handle is fixed to one end of the cylinder by means of spring pins passing through apertures formed in the handle and in the cylinder and the other end of the cylinder is fixed to the front end also by means of spring pins passing through apertures formed in the cylinder and in the front end.
  • the cylinder is formed of a rolled steel tube.
  • the chuck bushing is retained within the front end of the breaker in such a manner as to be replaceable without the need for a hydraulic press.
  • the lower end of the cylinder is connected to the air supply control valve in the handle by means of external ducting.
  • the invention provides a muffler for use with paving breakers and like machines wherein the muffler is formed to two identical parts.
  • a paving breaker shown generally at 1, comprises a handle 10, a cylinder 20 and a front end 30.
  • the handle 10 has an inlet 11 for compressed air which is fed, under the control of a hand operated valve (not shown), alternately to the top of the cylinder 20 and to the bottom of the cylinder 20 via a valve assembly, for example, of the type illustrated in our co-pending U.S. Patent Application No. 241,856 (or GB-A-2018904).
  • valve assembly may be of any conventional type and, as is known in the art, is located in the handle 10 within a valve assembly chamber 12.
  • the valve assembly serves to pass automatically compressed air to the top of the cylinder 20 and to the bottom of the cylinder through a port 13 which communicates with an oiler port 14.
  • the cylinder 20 is attached to the handle 10 by means of a pair of spring pins 21 received in and co-operating with semi-circular apertures 22 drilled in the handle 10 and corresponding semi- circular apertures 23 drilled in the cylinder 20.
  • the apertures 22 and 23 are offset by an interference amount so that when the pins 21 are inserted, the cylinder 20 is held tightly against the handle 10.
  • the cylinder 20 is provided with a piston 24 for reciprocating movement therein and at the lower end of its stroke engages an anvil 35 located in the front end 30.
  • the cylinder 20 is also provided with a transfer port 26 which communicates with the port 13 in the handle 10 via an external pipe 80 (Fig. 3).
  • the cylinder 20 is attached to an outer part 31 of the front end 30 by means of a spring pins 32 which engage respective semi- circular apertures 36, 37 in the cylinder 20 and in the outer part 31.
  • a chuck bushing 33 which is fixed within the outer part 31 by means of a spring pins 34 which engage respective semicircular apertures 38, 39 in the outer part 31 and in the chuck bushing 33.
  • a tool 41 fixed in place by a tool retaining mechanism 40 in the form of a spring loaded cam 42.
  • a paving breaker similar to that illustrated in Fig. 1 having a handle 50 and a front end 70.
  • the cylinder 50 has a smaller bore and may be formed of a rolled steel tube. To reduce weight, the outer part of the cylinder 50 is machined away to leave a thin wall portion 50a. In this way, the bore to weight ratio of the paving breaker is kept within a desired range.
  • the handle 60 is attached to the cylinder 50 by spring pins 51 and the cylinder is attached to the front end 70 by spring pins 52.
  • the front end 70 has an outer part 71 and a chuck bushing 72 carrying an anvil 74.
  • the chuck bushing 72 is held against the cylinder 50 by virtue of an annular portion 77 engaging a ledge portion 71a of the outer part 71.
  • a tool 76 is located by a tool retaining device 78 fixed to the chuck bushing 72 by a thumb screw 75, the tool 76 being held in the device 78 by a spring loaded locking mechanism 73.
  • the connection between the bottom of the cylinder and the handle is effected by external ducting 80.
  • the ducting is connected to the cylinder and to the handle by standard fittings.
  • the handle is formed of a steel tube 85 to which the inlet control valve 86 is fitted, the valve 86 being operated by a control handle 87 through a plunger 89.
  • the tool 84 is retained in place by a pivotal retaining bar 88.
  • the paving breaker of the present invention is provided with a muffler 90 as illustrated in Fig. 4.
  • the muffler serves also to protect the external ducting 80 and is provided with exhaust opening 91.
  • the muffler 90 is preferably formed of two identical halves which are suitably sloped internally to receive the cylinder and the external ducting 80. Each half of the muffler is symmetrical about a horizontal axis so that a complete shape may be formed from two identical parts simply by inverting one of them.
  • a protective cover may be fitted to protect the external ducting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Claims (4)

1. Straßendeckenaufbruchgerät mit einem Handgriff (10, 60), einem Zylinder (20, 50) und einem Vorderteil (30, 70), wobei die jeweiligen Enden des Zylinders (20, 50) in zylindrische Bohrungen in dem Handgriff (10, 60) bzw. in dem Vorderteil (30, 70) eingreifen und in diesen durch Befestigungsteile gehalten sind, dadurch gekennzeichnet, daß der Handgriff (10, 60) an einem Ende des Zylinders (20, 50) mittels Federstiften (21, 51) befestigt ist, die durch Öffnungen (22, 23) in dem Handgriff (10, 60) und in dem Zylinder (20, 50) hindurchgesteckt sind und daß das andere Ende des Zylinders (20, 50) an dem Vorderteil (30, 70) ebenfalls mittels Federstiften (32, 52) befestigt ist, die durch Öffnungen (38, 39) in dem Zylinder (20, 50) und in dem Vorderteil (30, 70) hindurchgesteckt sind.
2. Straßendeckenaufbruchgerät nach Anspruch 1, dadurch gekennzeichnet, daß der Zylinder (50) aus einem gewalzten Stahlrohr gebildet ist.
3. Straßendeckenaufbruckgerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das untere Ende des Zylinders (20, 50) über eine äußere Leitung (80) an ein Luftzuführsteuerventil (12) in dem Handgriff (10, 60) angeschlossen ist.
4. Straßendeckenaufbruchgerät nach Anspruch 1 oder 2 oder 3 mit einem Schalldämpfer, dadurch gekennzeichnet, daß der Schalldämpfer (90) aus zwei identischen Teilen besteht.
EP82300822A 1981-02-19 1982-02-17 Strassendeckenaufbruchgerät Expired EP0059071B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB8105238 1981-02-19
GB8105238 1981-02-19
AU84893/82A AU8489382A (en) 1981-02-19 1982-06-13 Paving breakers

Publications (2)

Publication Number Publication Date
EP0059071A1 EP0059071A1 (de) 1982-09-01
EP0059071B1 true EP0059071B1 (de) 1985-07-24

Family

ID=34394680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82300822A Expired EP0059071B1 (de) 1981-02-19 1982-02-17 Strassendeckenaufbruchgerät

Country Status (4)

Country Link
EP (1) EP0059071B1 (de)
JP (1) JPS57201184A (de)
AU (1) AU8489382A (de)
DE (1) DE3264819D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6062322A (en) * 1998-06-15 2000-05-16 Sandvik Ab Precussive down-the-hole rock drilling hammer
DE102014212161A1 (de) * 2014-06-25 2015-12-31 Robert Bosch Gmbh Handwerkzeugmaschinenschlagwerkvorrichtung
CN110902624B (zh) * 2018-08-24 2020-12-22 海宁市耐得照明电器有限公司 一种室内高处安装工作用装置及其使用方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1572019A (en) * 1917-12-28 1926-02-09 Ryan Car Company Fluid-pressure hammer
US1511677A (en) * 1921-02-28 1924-10-14 Chicago Pneumatic Tool Co Locking means for impact tools
AT106682B (de) * 1925-09-09 1927-06-25 Boehler & Co Ag Geb Preßluftwerkzeug.
DE1300476B (de) * 1966-12-03 1969-07-31 Froelich & Kluepfel Maschinenf Drucklufthammer, insbesondere Abbau- oder Aufbruchhammer
US4189917A (en) * 1978-09-18 1980-02-26 Kent Air Tool Company Air hammer and muffler combination

Also Published As

Publication number Publication date
JPS57201184A (en) 1982-12-09
DE3264819D1 (en) 1985-08-29
EP0059071A1 (de) 1982-09-01
AU8489382A (en) 1983-12-22

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