EP3153288A1 - Ciseau - Google Patents

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Publication number
EP3153288A1
EP3153288A1 EP15250018.7A EP15250018A EP3153288A1 EP 3153288 A1 EP3153288 A1 EP 3153288A1 EP 15250018 A EP15250018 A EP 15250018A EP 3153288 A1 EP3153288 A1 EP 3153288A1
Authority
EP
European Patent Office
Prior art keywords
bolster
long
bladed
cutting body
handle
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Withdrawn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
EP15250018.7A
Other languages
German (de)
English (en)
Inventor
Kevin O'brien
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
Priority to EP15250018.7A priority Critical patent/EP3153288A1/fr
Publication of EP3153288A1 publication Critical patent/EP3153288A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/26—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by impact tools, e.g. by chisels or other tools having a cutting edge

Definitions

  • the present invention relates to bolsters, in particular a bolster for cutting a breeze block or concrete masonry unit. More particularly, but not exclusively, the present invention relates to a bolster with a blade that has a length substantially similar to the depth of a standard breeze block or concrete masonry unit.
  • Bolsters are typically formed of a piece, with a blade providing a cutting body with a shaft extending therefrom and topped with a striking body distal to the blade, wherein in use a user grasps the shaft and hits the striking body formed by the shaft top.
  • Concrete masonry units also called breeze blocks, concrete blocks, cement blocks,Until blocks, and foundation blocks - are large rectangular bricks used in construction. These are usually provided in standard sizes, for example 440mm long by 215mm deep by 100mm high in the UK, making a depth of 225mm with a mortar joint. These sizes are representative of the overall size when the block is used in a wall, inclusive of mortar-joints. The actual size of the individual blocks is usually about 9.5mm smaller to allow for the mortar joints.
  • a number of blocks namely one per course, will be cut down in length to the requisite size so that the wall or other item can be constructed to the required overall length to finalise the construction.
  • the cutting operations are often done with a tool such as a bolster.
  • Conventional bolsters are generally cold chisels that have a tall shank for gripping and holding upright and a sturdy substantially flat blade at the lower in use end of the shank to penetrate and then cleave a block when the upper in use end of the bolster is struck with a hammer/ mallet.
  • the blades of these tools generally have a length of around 50mm to 100mm, which is only half of the depth of a standard breeze block. This means that cutting the block usually requires a user to make a number of cuts aligned end-to-end over the depth of the block in order to create a cut over the full depth and thus cut the block down to the required length. This takes time and requires concentration and skill to ensure that the individual cuts are straight and correctly aligned.
  • CN202416884U describes and shows a detachable brick axe comprising an axe body, an axe handle, fixing holes, fixing nuts and a mounting groove, wherein positioning holes are formed in the upper side of the axe body; the mounting groove is formed in the axe handle; and the axe body and the axe handle are fixedly mounted through the fixing nuts.
  • WO200754711 describes and shows a tool adapted for splitting masonry blocks, comprising a substantially ' C ' shaped rigid frame , the stem of the 'C' being provided with a cutting member, arranged so that the limbs of the frame are at opposite ends of the cutting member to cut into the side faces of the block in use,
  • This frame has a handle projecting from the frame longitudinally in the plane of the blade at one end of the blade aligned with the line of cut, or above it as per conventional bolsters, for holding the frame and blade upright when striking the frame to cut the block.
  • the frame is difficult to manage in use and especially when the handle is at one end and further when positioned above the blade the handle must have a guard to protect the user's hand from being struck.
  • GB 2411146 describes and shows a templating tool adapted for length position gauging for splitting multiple masonry blocks repeatedly at the same pre-defined length, the templating tool comprising a frame with an arm that sits onto the block with a lug to fix the cutting distance and having a vertical sleeve to slidingly carry the bolster for splitting the blocks.
  • the templating tool's frame has a handle, The bolster has no handle other than its own vertical shank and is not hand-held in use. It is steadied and guided by the templating frame. The templating frame and the templating frame's handle remain still in use while the bolster is struck and travels down through the sleeve of the templating frame to penetrate the block.
  • the present invention provides a simple one-piece tool that is simple and intuitive to use, easy and quick to position and hold stably and without need of any frame or hand guard, and which can cut a standard breeze block or concrete masonry unit to desired length without requiring repositioning across the depth of the block, and being small and portable enough to fit in a toolbag.
  • a long-bladed bolster comprising a substantially planar cutting body having a first long edge formed as a blade of sufficient length such that the blade is arranged in use to be positioned substantially centrally across a Concrete masonry unit (CMU) to enable the block to be divided without the bolster requiring repositioning, wherein the bolster has a striking body on a second long edge of the cutting body opposite to the cutting blade configured to receive repeated blows from a striking implement in use and transmit these through the cutting body to the blade and the bolster has an integral handle that extends from the planar cutting body and/or the striking body of the bolster from part way along the length of the cutting body and transverse to the plane thereof.
  • the handle extends substantially orthogonally from the plane of the cutting body.
  • the handle extends from substantially centrally along the length of the cutting body.
  • the bolster allows a user to position the tool where required and then divide the block without the need for repositioning across the depth of the CMU making multiple end-to-end cuts. Furthermore, the bolster is compact and sturdy, stable and easy for the user to hold and to use and is able to be struck with a tool such as a hammer and the planar body driven down through the CMU to the required depth to shear it without the user needing to have their hand guarded by a hand guard while doing so.
  • the handle is integrally formed or integrally assembled to the bolster and is part of the bolster and moves with it when the bolster is struck by a hammer.
  • the handle of the bolster mounted in a position on the planar cutting body of the bolster extending transverse/ substantially orthogonally from it, rather than at one end of it or on a shaft directly above it, the user's hand is closer to the central striking zone for optimal stability and ease of use yet sufficiently off-set from it to not be at significant risk of being struck.
  • the handle suitably joins to the cutting body below the striking body approximately half way up from the blade edge. It is spaced from the blade edge by a clearance that is sufficient to allow the planar body to travel down into the CMU and split the CMU apart yet without the handle obstructing the motion.
  • the handle preferably is of a form with an arm that projects and then rises at a steep angle from the planar body as will be described further below.
  • the blade may be at least 200mm in length. This allows the bolster to be used with standard-size CMUs of the smallest size.
  • the blade may be substantially around 230mm in length. This allows the bolster to be used with all standard sizes of CMU.
  • the bolster has a striking body/ anvil on the opposite edge of the cutting body to the cutting blade configured to receive repeated blows from a striking implement in use and transmit these through the cutting body to the blade.
  • the cutting body and the striking body are intimately and securely bonded. This provides a surface onto which a hammer or other striking implement can be struck and helps to ensure that striking forces are received and transmitted effectively.
  • the striking body may comprise a solid flat-topped body, which helps to ensure that striking forces are received and transmitted effectively.
  • the striking body may be welded to the edge of the cutting body. This allows the blade and body to be formed separately from the required materials and to the required dimensions. In other embodiments the striking body and cutting body may be an integral cast whole.
  • the striking body may be formed as an integral extension of the cutting body, allowing the bolster to be simply and easily formed and providing a strong form of construction.
  • the striking body is suitably located substantially centrally on the edge of the cutting body, helping to ensure that striking forces are received and transmitted effectively.
  • the arrangement of the handle is further advantageous as a conventional tall vertical shank held bolster is liable to have a shaft of excessive weight, particularly where the vertical handle shaft also provides the striking body. Displacement of the striking body / striking point relative to the hand permits safer striking, of special usefulness for the long-bladed bolster in view of the greater than normal striking force required. When splitting breeze blocks or the like, repositioning, stable holding and repeated secure striking is facilitated by the handle.
  • the handle comprises an arm connected at an inner end to a major planar face of the cutting body and having a handle grip, for example a knob, configured to fit within a user's hand connected to the outer end.
  • the arm allows the handle to extend a distance to keep the handle knob a safe distance from the striking body.
  • the handle arm is angled steeply upwards, allowing a user to keep their hand clear above the CMU in use while the end of the arm where it joins to the planar cutting body is of low profile from the body.
  • the handle grip may be a knob that is substantially spherical or bulbous, providing a good shape for grasping.
  • the handle is preferably welded to the cutting body or bolted to the cutting body by a bolt passing through the cutting body axially into or from the handle.
  • the bolster 1 is a long-bladed bolster that lacks an upright shank unlike conventional bolsters. It comprises a substantially planar cutting body 2 having a first major edge formed as a blade 3.
  • the blade 3 runs the full length of the body 2.
  • the planar body 2 is of sufficient length so that the blade 3 can be positioned substantially centrally on a concrete masonry unit or CMU (that is, spanning the depth of the CMU across the length thereof, with the ends of the body generally equidistant from the sides of the CMU), and will extend most or all of the way to each side of the CMU, or slightly overlap the sides of the CMU.
  • the CMU block can be divided without the bolster 1 requiring repositioning.
  • the cutting body 2/blade 3 is at least 200mm in length, and preferably around 230mm in length. The long length allows the bolster 1 to be used with all standard sizes of CMU, overlapping the sides of the narrower ones.
  • a striking body 4 is located on the opposite edge of the body 2 to the cutting blade 3, ie at the upper in use edge. To use the bolster, as shown in Figures 5A to 5C , the striking body 4 is struck by a hammer/ mallet M or similar repeatedly so that the force of these blows is transmitted through the striking body 4 and the cutting body 2 to the blade 3 to cut through the CMU which the blade 3 is located against.
  • the striking body 4 provides a surface onto which the hammer/ mallet M can be struck and helps to ensure that striking forces are received and transmitted effectively.
  • the striking body 4 is a solid, short cylindrical body, with a flat top that helps to ensure that striking forces are received and transmitted effectively.
  • the striking body 4 is welded to the upper edge of the planar cutting body 2.
  • the striking body could be formed as an integral extension of the body.
  • the striking body 4 is located substantially centrally along the top edge of the cutting body 2. This helps to ensure that striking forces are received and transmitted effectively.
  • the cutting body 2 is substantially planar. That is to say that it is a slim plate-like body that may be just a few mm thick (generally up to about 10mm at most) and may be of uniform thickness or of thickness tapering/narrowing towards the blade 3. It may be wedge-shaped in profile. It serves to cleave the CMU block as the blade passes down into the block.
  • the cutting body 2 is suitably about 70mm in depth/height from the cutting blade edge 3 to the opposing edge with the striking body 4.
  • a handle 5 extends from one of the major planar faces of the cutting body 2 substantially centrally along the length of the cutting body 2 for grasping by a user in one hand to position and hold the bolster 1 in position in use.
  • the handle 5 comprises an arm 6 connected at an inner end to the face of the cutting body 2 and a spherical handle knob 7 configured to fit within a user's hand connected to the outer end.
  • the arm 6 of handle 5 is bent/cranked into an open 'S' or 'Z' shape (that is, it does not double back on itself) as shown in figure 1 so that when connected the handle 5 is angled upwards.
  • the crank of the arm 6 is such that arm 6 presents a low profile at its point of attachment to the cutting body 2 and the steep angle of rise of the arm 6 also helps prevent risk of any impact of the handle arm on the block as it is cleaved.
  • the angle of rise of the arm 6 is preferably greater than 40 degrees and of the order of 50 to 60 degrees from the horizontal plane/ plane of the surface of the CMU block being cut into.
  • the arm 6 attachment point to the cutting body 2 is preferably spaced up from the blade edge 3 by a clearance of about 45mm, eg 40 to 60mm, to facilitate the cleavage action.
  • the low profile initial part of the arm 6, attached to the cutting body 2 is preferably 25 mm or no more than about 40mm in length.
  • the height from the bottom crank of arm 6 to top crank of arm 6 is preferably about 60mm or between 50mm and 70mm.
  • the handle grip is preferably about 80mm in length or between 50mm and 100mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
EP15250018.7A 2015-10-08 2015-10-08 Ciseau Withdrawn EP3153288A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15250018.7A EP3153288A1 (fr) 2015-10-08 2015-10-08 Ciseau

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15250018.7A EP3153288A1 (fr) 2015-10-08 2015-10-08 Ciseau

Publications (1)

Publication Number Publication Date
EP3153288A1 true EP3153288A1 (fr) 2017-04-12

Family

ID=54364209

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15250018.7A Withdrawn EP3153288A1 (fr) 2015-10-08 2015-10-08 Ciseau

Country Status (1)

Country Link
EP (1) EP3153288A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU703595B2 (en) * 1997-07-14 1999-03-25 Dennis Kelvin Simmons Brick cutting tool
DE10050118A1 (de) * 2000-10-11 2002-06-20 Sgobbo Giuseppe Klinkenschneider
GB2411146A (en) 2004-02-12 2005-08-24 Paul Bonner Device for cutting bricks
WO2007054711A1 (fr) 2005-11-12 2007-05-18 Peter William Mullins Fendeur de maconnerie
CN202416884U (zh) 2012-02-03 2012-09-05 汪贤女 一种可拆砖刀
US20130340739A1 (en) 2002-03-20 2013-12-26 Anchor Wall Systems, Inc. Block splitting assembly and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU703595B2 (en) * 1997-07-14 1999-03-25 Dennis Kelvin Simmons Brick cutting tool
DE10050118A1 (de) * 2000-10-11 2002-06-20 Sgobbo Giuseppe Klinkenschneider
US20130340739A1 (en) 2002-03-20 2013-12-26 Anchor Wall Systems, Inc. Block splitting assembly and method
GB2411146A (en) 2004-02-12 2005-08-24 Paul Bonner Device for cutting bricks
WO2007054711A1 (fr) 2005-11-12 2007-05-18 Peter William Mullins Fendeur de maconnerie
CN202416884U (zh) 2012-02-03 2012-09-05 汪贤女 一种可拆砖刀

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