GB2187664A - Hand-holdable drilling machine - Google Patents
Hand-holdable drilling machine Download PDFInfo
- Publication number
- GB2187664A GB2187664A GB08609165A GB8609165A GB2187664A GB 2187664 A GB2187664 A GB 2187664A GB 08609165 A GB08609165 A GB 08609165A GB 8609165 A GB8609165 A GB 8609165A GB 2187664 A GB2187664 A GB 2187664A
- Authority
- GB
- United Kingdom
- Prior art keywords
- engine
- drilling machine
- machine
- output shaft
- cord
- 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- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
- B23B45/04—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor driven by fluid-pressure or pneumatic power
- B23B45/046—Piston engines
- B23B45/048—Internal combustion piston engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B1/00—Engines characterised by fuel-air mixture compression
- F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
- F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
Abstract
The machine has a miniature petrol engine 4 of a size such that the machine produces approximately .25b.h.p./kg to impart rotary motion to an output shaft 10 to which a chuck 12 is, or may be, attached and a forward fuel tank. Between the engine and the output shaft is a centrifugal clutch for shaft rotation prevention during engine idling and a cord operated recoil starter device 5 is provided by which to rotate the engine for starting purposes. The cord 17 of the starter device 5 is directed rearwardly so that an operator pulls the cord towards him whilst pointing the drilling machine away from him. The machine includes an exhaust silencer which is arranged to discharge in a forward direction. The silencer has a passage therethrough, through which a centrifugal cooling fan 6 driven from the rear of the engine draws cooling air. Ducting directs air from the fan past the engine to be discharged in a forward direction. The handle has a throttle trigger 20. The tank is pressurized manually for starting and by an exhaust pipe located pressure take-off during running. An electric starter may be used. <IMAGE>
Description
SPECIFICATION
Improvements in or relating to hand-holdable drilling machines
This invention relates to hand-holdable drilling machines, that isto say a machine having means for imparting rotary motion to an output shaft to which is, or may be, attached a chuck and which machine may be operated whilst being held by hand. Whilst theterm "hand drill" is commonly used in connection with such machines, their use often extends beyond simple drilling operations. Various devices (e.g. sanding discs, grind wheels etc.) may be engaged by the chuck and often other more elaborate attachments may be driven by being substituted for the chuck. Commonly also such hand drills may be operated not only whilst held by hand, but also mounted in a stand.
Typically, as at present known, motorised hand drills are electrically or pneumatically driven. In either case they are most conveniently used at a base station having permanent supply of electricity or compressed air. For use on a site portable generators or compressors may be provided, but these are often inconvenient and sometimes quite impracticable due to the difficulty of locating the generator or compressor near the operation or moving the same aboutthe site.
Cordless electric hand drills incorporating a rechargeable battery are available but these tend to be low-powered and, even so, of limited endurance between recharges. The recharging operation itself tends to be a lengthy process. Formanypurposes the power alone rules out their use. Whereas typically a heavy duty mains-powered electric drill produces approximately 0.18 b.h.p./kg a large battery powered drill typically will only produce approximately 0.06 b.h.p/kg.
Even where, bythe use of extension leadsfor example, mains powered electric drills are able to be operated on a site, it is inconvenient and there is an element danger involved particularly if the site is an outdoor or marine one.
The present invention seeks to overcome one or
more of the above-mentioned long experienced difficulties.
According to this invention a hand-holdable
drilling machine comprises a miniature internal combustion engine connected to impart rotary
motion to an output shaft to which a chuck is, or may
be, attached and means providing a reservoir offuel for said engine.
Preferably said engine is a petroleum burning engine and whilst said engine may be adaptedto operate with a gas cylinder of butane or propane preferably said reservoir is a liquid petroleum tank.
Said engine may be ofthefourortwostroke variety. If the latter, the fuel will normally be a
petrol/oil mixture as knownperse.
Typicallysaidenginewill be one having a power
output such thatthe machine produces approximately 0.25 b.h.p/kg (brake horse power per
kilogramme).
Preferably said engine is arranged with the axis of
rotation of its crank shaft parallel to the axis of motion of said output shaft and preferably the rotation of said crank shaft and said output shaft are coaxial.
Preferably said drilling machine is air-cooled by means of a centrifugal fan driven by said engine and preferably from the rear of said engine.
Normally the drilling machine will be provided with an exhaust silencer. Preferably said exhaust silencer is arranged to discharge exhaust gases in a in a forward direction away from an operator.
Preferably where said drilling machine is cooled by a cooling fan, said silencer is formed with a passage therethrough through which said cooling fan draws cooling air.
A diaphragm pump is preferably provided to draw fuel from said tank.
Said tank may however be arranged to be pressurised in which case, preferably said tank is arranged to be pressurised by means of a pressure line ending in a pressuretake-offwithin said silencer.
In the last-mentioned case, means will normally be provided whereby the pressure line may be pressurised manually for starting.
Preferably between said engine and said output shaft is a centrifugal clutch whereby said engine may be started and may idle without rotating said output shaft.
Preferably a cord operated recoil start device is provided by which to rotate said engine for starting purposes. Preferably the cord of said recoil starter device is directed rearwardly whereby to be operated by an operator pulling the cord towards him whilst pointing the drilling machine away from him.
Preferably said drilling machine has a rearward handle having a slot within which is partly located a starting handle attached to said starter cord.
Preferably also said rearward handle houses a throttle trigger by means of which the rotational speed of said engine may be controlled.
Said drilling machine may include a gearbox arrangement as knownpersewith or without selectable percussion means and in addition have an electric starting device powered by a rechargeable battery.
The invention is illustrated in and further described with reference to the accompanying drawings in which Figure 1 is a perspective view of one example of drilling machine in accordancewith the present invention with the external features shown in phantom outline. Figure 2 is an exploded view of the engine, starting, cooling and transmission internal components of the drilling machine of Figure 1. Figure 3 is an exploded view of the silencing, fuel and ignition internal components ofthedrilling machine of Figure 1. Figure 4 is a side elevation of another embodiment of drilling machine in accordance with the present invention and Figures 5to 13 illustrate different features of the drilling machine to Figure 4.Each of Figures 5 to 10 show differentfeaturesofthedrilling machine in Figure4 in detail against a phantom outline of the complete drilling machine so as to illustrate the disposition and arrangement of the different components;
Figures 11 and 12 illustrate the arrangement ofthe casing and Figure 13 is a side elevation ofthedrilling machine of Figure 4 shown in complete detail with the casing in phantom outline.
In all oftheFigures like references are used for like components.
Referring particularlyto Figures 1 to 3 the drilling machine in this example consists of a box-like main body 1 made up of metal plates such as 2 joined together by means of screws 3. The main body 1 houses the engine 4, starting arrangement 5, cooling arrangement 6 and the primary components of the transmission system 7.
Atthe output end 8 of the main body 1 is attached a gear box and percussion arrangement contained within a cast nose piece 9. An output shaft 10 extends beyond the nose piece 9. The remote end 11 ofthe output shaft 10 is threaded to receive a chuck 12. The nose piece 9 has an integral collar 13 surrounding the output shaft 10. The collar 13 is provided to receivethe clamp end 14 of a detachable handle 15.
Atthe rear end ofthe main body 1 is a handle 16 through which passes the engine starting pull cord 17. To the end of engine starting cable 17 is attached a small handle 18 partly accommodated within a slot
19 in the lower part of the handle 16.
The handle 16 also accommodates a spring loaded throttle trigger 20 which is finger-operated from the inside of the handle 16.
Beyond the detail already given and beyond obtaining an appreciation of the overall layout of the drilling machine, reference from this point is better
made to Figures 2 and 3 showing the internal component parts of the drilling machine of Fig u re 1
in exploded fashion.
As has already been explained, Figure 2 concentrates on the engine, starting, cooling and transmission internal components ofthe drilling
machine, be they housed in the main body 1, nost
piece 9 or rear handle 16.
Referring particularly to Figure 2, the engine 4 is a
small two stroke engine as commonly used in model
engineering modified for ordinary petrol. Its cubic
capacity is of a few cos such that the drilling machine
produces approximately .25 brake horsepower per
kilogramme in this particular example. In detail the
engine consists of a crank shaft 21 mounted within a
crank case assembly 22 and supported by main crank
shaft bearings 23. The crank shaft 21 carries a
flywheel assembly 22 featuring an in let port 23 and a
crank pin 24. Carried on the crank pin 24 is a conrod
25 to which is attached a piston 26 which works
within the cylinder 27 of the engine. The flywheel
assembly is completed by a secondary flywheel and
crank pin assembly 28 carried by bearings 29.An exhaust port 30 is formed in thewall ofthe cylinder 27 and the last-mentioned is closed by a cylinder
head 31 which is formed as a finned heat sink.
The engine assembly is completed by rubber fibre
flexible mountings 32.
As will be seen, the main shaft 21 isthreaded at its
output end 33 to receive an external flywheel 34. The
inner face oftheflywheel 34 carries the pull cord
starting mechanism which in detail consists of a
spring-loaded pulley 35 (the spring of which is
shown at 36) which co-operates with a ratchet and pawl mechanism carried on the innerface of the flywheel 34. The ratchet ofthe ratchet and pawl mechanism is referenced 37 and the pawl 38. The interiorofthespring loaded pulley35 accommodating the pull cord 17 andthe spring 36 is covered by a spring housing 39.
Beyond the external flywheel 34 is a centrifugal clutch arrangement consisting of a clutch outer housing 40 having an internal clutch lining 41 and a centrifugal clutch 42. The outer housing 40 is carried upon a bearing 43.
The clutch outer housing connects via a flexible coupling arrangement 44 to the output shaft 7 carried by bearings 45 within a bearing housing 46 which itself is supported bytheforward end plate of the main body 1 shown in Figure 1.
The components within the nose piece 9 of Figure 1 aresimilartothoseto befound in conventional high powered electric drilling machines incorporating a percussion feature. As will be seen these consist of an output shaft 10 the end 11 of which is threaded to accept a chuck (12 in Figure 1 butnotshown in Figure 2); a percussion ratchet arrangement47 with its associated percussion selector48; a lay shaft assembly 49, with its associated bearings 50; and a gear selector 51.
Carried on the end of the secondary crankshaft forming part of the secondary flywheel assembly 28 is a cooling fan 52 within a fan housing assembly consisting of a main housing 53 formed to provide a duct 54 conducting airsucked in from a grill in the rear end plate of the main casing 1 of Figure 1, onto thefinned heatsinkcylinder head 31 of the engine4.
Thebackplateofthefan housing is shown at 55.
Referring now to Figure 3, as has already been mentioned this concentrates upon the silencing,fuel and ignition internal components ofthe drilling machine shown in Figure 1.
Referring first to the ignition system, this consists of an electronic ignition unit 56; ignition coil 57 (the associated flywheel magnets carried by the external flywheel 34 (Figure 2) being referenced 58 in Figure 2); ignition cut out switch 59, mounted in the rear end panel of the main housing 1 of Figure 1; ignition lead 60, with a suppressor spark plug top 61 and spark plug 62. An access panel 63 is provided within the panel forming the underside of the main body 1 in Figure 1 in order to permit removal of the spark plug 62 without necessitating the removal of one of the larger panels forming the main body.
The fuel system consists of a shaped fuel tank 64 which is provided to be pressurised by means of a fuel pressure line 65 from the exhaust, as will be described later. For starting purposes there is a manual pressurising arrangement consisting essentially of a pipe 66 leading directly to the pressure line 65 and a closure cap 67. The tank64 is filled by means of an inletfuelling pipeassembly68 having a filling pipe 69 and a vent pipe 70, the last-mentioned being connected to a vent line 71. A sealing filler cap 72 closes both the fuel and vent pipe orifices. For convenience the tank assembly includes a fuel level sight glass assembly 73.The output pipe 74 ofthe tank 64 is connected via a fuel valve 75 and a fuel filter 76 to a carburretor77 which is sited within an inlet silencer 78 which also acts as a carrier for the carburretor control. The carburretor control consists of a throttle spindle assembly 79 and a throttle linkage 80 connected to the throttle trigger 20 located, as has already been described, in the rear handle 16, as shown in Figure 1.
As will be seen, the inlet silencer78 is perforated at the top and the perforations are covered by a choke plate assembly 81 consisting of a perforated choke plate 82 which is slidable to cover or expose the perforations in the inlet silencer 78 under the control of a choke slide 83. Within the choke plate assembly 81 isafoamfilterelement84.
The engine exhaust system consists of an exhaust manifold 85 leading into an exhaust silencer 86 having a primary expansion chamber87 and a secondary expansion chamber 88. Exiting from tha secondary expansion chamber88 is an exhaust pipe 89 which extends forwards to exitfrontwards through the forward end plate ofthe main body 1 shown in Figure 1. The rear end of pressure line 65 terminates in a pressure take-off 90, which connects into exhaust pipe 89 immediately in front of exhaust silencer 86.
In operation, a user firstly operates choke slide 83 to cause the perforated choke plate 82 to obstructthe perforations in the inlet silencer 78 to provide a choking effect. If necessary, use is made of manual pressurising arrangement 66,67.
The ignition is switched on by means of switch 59 and the handle 18 is pulled backwards towards the operator by one hand whilst the other grips the rearward handle 16. Once the engine4firesthe choke slide 83 is operated judiciously to uncoverthe perforations in the air silencer sothatcarburettor 77 breathes normally. By the action of the exhaust, tank 64 pressurises to maintain the fuel supply to the carburretor automatically.
With the engine 4 idling, no drive istransmitted through the centrifugal clutch arrangement 40-42 to the output shaft 7. As engine speed is increased using the throttle trigger 20 so the centrifugal clutch arrangement grips and power is applied to the ouptut shaft 7 and thus through to the transmission system within nose piece 9 and thence to the chuck 22. The choice of gear ratio is chosen using the selector 51 and percussion selector 48 is operated to produce a percussion effect, if desired.
As with a conventional drilling machine, a variety of devices other than mere drill bits may be engaged by the chuck 12, eg. sanding discs, grind wheels etc.
and the chuck may of course be removed if it is required to drive other attachments directlyfrom the final output shaft 10.
Turning now to the embodiment illustrated in
Figures4to 13, it will be seen thatthe mechanical features ofthe drilling machine thereby illustrated are essentiallyvery similarto those ofthe drilling machine illustrated in figures 1 to 3. In fact the principle difference resides in the use of a moulded high impact plastic orcast alloy body. The arrangementofthedrilling machine illustrated in
Figures4to 13 will it is believed be largely self-evident from the foregoing detailed description of the embodiment illustrated in Figures 1 to 3 and the following brief description explaining what is shown in each Figure.
Referring to Figure4, this will provide an impression of the overall external appearance ofthe drilling machine.
Referring to Figure 5, this illustrates the transmission system within nose piece 9 and the disposition ofthe petrol engine 4.
Referring to Figure 6, this illustrates in particular the disposition of the centrifugal clutch mechanism 40-42 which, as previously described, permits starting and idling withoutthe chuck rotating. Itwill also be appreciated that the centrifugal clutch will tend to protect both the engine and the operator from inertial damage should, for example, a drill bit withinthe chucksuddentlyjam. The same is of course true of the embodiment described with reference to Figures 1 to 3.
Referring to Figure 7, this shows the disposition of the centrifugal fan arrangement 52-55 driven from the rear end of the secondary crank shaft of the engine4. As illustrated, this draws cooling airfrom the rear of the drill which is ducted past the cylinder and cylinder head to be discharged forward away from the operator.
Referring to Figure 8, this illustrates in particular the silencing arrangements, both inlet and exhaust.
The discharge of the exhaust through the double expansion silencer system and forward away from the operator is clearly shown. A comparison with
Figure 7 will showthatthe cooling airforthe centrifugal fan arrangement 52-55 is actually drawn through the centre of the exhaust silencer arrangement 86 and is thereby cooled. Forfurther noise attenuation on the input side, the inlet silencer 78 is foam filled. The foam filling also acts as inlet air filter.
Referring to Figure 9, in this example the fuel tank 91 has a weighted flexible outlet 92 and a pressure operated diaphragm pump 93. In these respects the drilling machine presently being described differs from that described with referenceto Figures 1 to3.
Such an arrangement of fuel supply is an improvement in terms of ensuring continuous running and a constantfuel/air mixture irrespective of the attitude of the drill. The fuel tankfiller cap 94, in this case incorporates a one-wayvalve air vent.
Referring to Figure 10,thisillustratesin particular the recoil start mechanism and throttle trigger arrangement both of which are essentially similarto the corresponding arrangements already described with reference to Figures 1 to 3. In this case however an ignition cut-out button 95 is located in the rear handle 16 adjacent the throttle trigger 20. In this particular example also the carburettor is one fitted with a cold start choke device controlled by a removable lever (not shown) on the side ofthe casing.
Referring to Figure 11, this illustrates the various flexible connections which are employed. Flexible connection 96 isolates the centrifugal clutch from the transmission system within nose piece 9 whilst flexible mountings 97 and 98 fix the engine assembly to the outer casing.
Referring to Figure 12, this illustrates the feature thatthe whole assembly of engine, cooling, fuel and exhaust systems is removable in one piece with the rear handle 16. As with the embodiment described with reference to Figures 1 to 3, a quick release panel 63 gives access to the sparking plug. Holes such as that referenced 99 allow adjustmentsto the carburretor.
Figure 13 gives an overall impression ofthe internal layout ofthetotality of components.
Claims (22)
1. A hand-holdable drilling machine comprising a miniature internal combustion engine connected to impart rotary motion to an output shaft to which a chuck is, or may be, attached and means providing a reservoir offuel for said engine.
2. A drilling machine as claimed in claim 1 and wherein said engine is a petroleum burning engine.
3. A drilling machine as claimed in claim 1 or 2 and wherein said reservoir is a liquid petroleum tank.
4. A drilling machine as claimed in any of the above claims and wherein said engine has a power output such the machine produces approximately 0.25 b.h.p./kg (brake horse power per kilogramme).
5. Adrilling machine as claimed in anyofthe above claims and wherein said engine is arranged with the axis of rotation of its crankshaft parallel to the axis of motion of said output shaft.
6. A drilling machine as claimed in claim 5 and wherein the rotation of said crank shaft and said output shaft are coaxial.
7. Adrilling machineas claimed in any ofthe above claims and wherein said drilling machine is air-cooled by means of a centrifugal fan driven by said engine.
8. A drilling machine as claimed in claim 7 and wherein said centrifugal fan is driven from the rear of said engine.
9. A drilling machine as claimed in any of the above claims and provided with an exhaust silencer, said exhaust silencer being arranged to discharge exhaust gases in a forward direction awayfrom an operator.
10. Adrilling machine as claimed in anyofthe above claims, cooled bya cooling fan, and having an exhaust silencer formed with a passage therethrough through which said cooling fan draws cooling air.
11. A drilling machine as claimed in any ofthe above claims and wherein a diaphragm pump is provided to draw fuel from said tank.
12. A drilling machine as claimed in any ofthe above claims 1 to 10 and wherein said tank is arranged to be pressurised.
13. A drilling machine as claimed in claim 12 and arranged to be pressurised by means of a pressure line ending in a pressure take-offwithin an exhaust pipe.
14. Adrilling machine as claimed in claim 13 and wherein means are provided manually to pressurise the said pressure line for starting.
15. A drilling means as claimed in anyofthe above claims and wherein between said engine and said output shaft is a centrifugal clutch whereby said engine may be started and may idle without rotating said output shaft.
16. A drilling machine as claimed in any ofthe above claims and wherein a cord operated recoil starter device is provided by which to rotate said engine for starting purposes.
17. A drilling machine as claimed in claim 16 and wherein the cord of said recoil starter device is directed rearwardlywherebyto be operated byan operator pulling the cord towards him whilst pointing the drilling machine away from him.
18. A drilling machine as claimed in claim 16 or 17 and wherein said drilling machine has a rearward handle having a slot within which is partly located a starting handle attached to said starter cord.
19. Adrilling machine as claimed in any ofthe above claims and wherein said drilling machine has a rearward handle which houses a throttle trigger by means of which the rotational speed of said engine may be controlled.
20. Ahand-holdabledrillingmachine substantially as herein described with reference to
Figures 1 to 3 of the accompanying drawings.
21. A hand-holdable drilling machine substantially as herein described and illustrated in Figures4to 13 of the accompanying drawings.
22. A drilling machine as claimed in any ofthe above claims wherein an electric starter motor is provided powered by rechargeable battery.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB868603221A GB8603221D0 (en) | 1986-02-10 | 1986-02-10 | Hand holdable drilling machines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8609165D0 GB8609165D0 (en) | 1986-05-21 |
| GB2187664A true GB2187664A (en) | 1987-09-16 |
Family
ID=10592791
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868603221A Pending GB8603221D0 (en) | 1986-02-10 | 1986-02-10 | Hand holdable drilling machines |
| GB08609165A Withdrawn GB2187664A (en) | 1986-02-10 | 1986-04-15 | Hand-holdable drilling machine |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868603221A Pending GB8603221D0 (en) | 1986-02-10 | 1986-02-10 | Hand holdable drilling machines |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8603221D0 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2286352A (en) * | 1994-01-20 | 1995-08-16 | Universal Drilling And Cutting | Drilling machine |
| FR2801230A1 (en) * | 1999-11-20 | 2001-05-25 | Stihl Maschf Andreas | HAND DRILL WITH COMBUSTION ENGINE |
| WO2011129731A1 (en) * | 2010-04-16 | 2011-10-20 | Husqvarna Ab | A core drilling machine and a handle assembly for a core drilling machine. |
| DE10213093B4 (en) * | 2002-03-23 | 2013-06-20 | Andreas Stihl Ag & Co. | Hand drill with a combustion engine |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB260354A (en) * | 1925-07-30 | 1926-11-01 | Percy Carr Bird | Improvements in or relating to portable power-operated tools |
| US3176547A (en) * | 1961-02-13 | 1965-04-06 | Walter H Schnacke | Variable speed transmission for a portable drill |
| GB1026341A (en) * | 1962-01-24 | 1966-04-20 | John Henry Pierce | Improvements relating to power-operated tools |
| GB1122436A (en) * | 1966-05-24 | 1968-08-07 | Tarpen Engineering Company Ltd | Improvements relating to power-operated hand tools |
| GB1210006A (en) * | 1967-07-24 | 1970-10-28 | Hilti Ag | Motor-powered hammer drill |
| US3990523A (en) * | 1975-03-17 | 1976-11-09 | Schramm Buford J | Piston engine powered rotary drive with mount and fuel container |
| US4227840A (en) * | 1979-05-18 | 1980-10-14 | Clovis Thivierge | Drilling attachment for chain saw |
-
1986
- 1986-02-10 GB GB868603221A patent/GB8603221D0/en active Pending
- 1986-04-15 GB GB08609165A patent/GB2187664A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB260354A (en) * | 1925-07-30 | 1926-11-01 | Percy Carr Bird | Improvements in or relating to portable power-operated tools |
| US3176547A (en) * | 1961-02-13 | 1965-04-06 | Walter H Schnacke | Variable speed transmission for a portable drill |
| GB1026341A (en) * | 1962-01-24 | 1966-04-20 | John Henry Pierce | Improvements relating to power-operated tools |
| GB1122436A (en) * | 1966-05-24 | 1968-08-07 | Tarpen Engineering Company Ltd | Improvements relating to power-operated hand tools |
| GB1210006A (en) * | 1967-07-24 | 1970-10-28 | Hilti Ag | Motor-powered hammer drill |
| US3990523A (en) * | 1975-03-17 | 1976-11-09 | Schramm Buford J | Piston engine powered rotary drive with mount and fuel container |
| US4227840A (en) * | 1979-05-18 | 1980-10-14 | Clovis Thivierge | Drilling attachment for chain saw |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2286352A (en) * | 1994-01-20 | 1995-08-16 | Universal Drilling And Cutting | Drilling machine |
| FR2801230A1 (en) * | 1999-11-20 | 2001-05-25 | Stihl Maschf Andreas | HAND DRILL WITH COMBUSTION ENGINE |
| US6464018B1 (en) | 1999-11-20 | 2002-10-15 | Andreas Stihl Ag & Co. | Portable handheld drilling machine having an internal combustion engine |
| DE19955930B4 (en) * | 1999-11-20 | 2008-09-25 | Andreas Stihl Ag & Co. | Hand drill with a combustion engine |
| DE10213093B4 (en) * | 2002-03-23 | 2013-06-20 | Andreas Stihl Ag & Co. | Hand drill with a combustion engine |
| WO2011129731A1 (en) * | 2010-04-16 | 2011-10-20 | Husqvarna Ab | A core drilling machine and a handle assembly for a core drilling machine. |
| CN102892537A (en) * | 2010-04-16 | 2013-01-23 | 胡斯华纳有限公司 | A core drilling machine and a handle assembly for a core drilling machine |
| US9149876B2 (en) | 2010-04-16 | 2015-10-06 | Husqvarna Ab | Core drilling machine and a handle assembly for a core drilling machine |
| CN102892537B (en) * | 2010-04-16 | 2016-03-16 | 胡斯华纳有限公司 | Core-drill(ing) machine and the Handleset for core-drill(ing) machine |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8603221D0 (en) | 1986-03-19 |
| GB8609165D0 (en) | 1986-05-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |