CS226230B1 - Manual pneumatic percussive tool - Google Patents

Manual pneumatic percussive tool Download PDF

Info

Publication number
CS226230B1
CS226230B1 CS317481A CS317481A CS226230B1 CS 226230 B1 CS226230 B1 CS 226230B1 CS 317481 A CS317481 A CS 317481A CS 317481 A CS317481 A CS 317481A CS 226230 B1 CS226230 B1 CS 226230B1
Authority
CS
Czechoslovakia
Prior art keywords
handle
working cylinder
tool
working
spring
Prior art date
Application number
CS317481A
Other languages
Czech (cs)
Inventor
Vladimir Ing Koudelka
Original Assignee
Vladimir Ing Koudelka
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 Vladimir Ing Koudelka filed Critical Vladimir Ing Koudelka
Priority to CS317481A priority Critical patent/CS226230B1/en
Publication of CS226230B1 publication Critical patent/CS226230B1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24Damping the reaction force
    • B25D17/245Damping the reaction force using a fluid
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/04Handles; Handle mountings
    • B25D17/043Handles resiliently mounted relative to the hammer housing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/11Arrangements of noise-damping means
    • B25D17/12Arrangements of noise-damping means of exhaust silencers

Abstract

The tool has a handle (1) fixed to a body (5) and a side inlet passage (2) with a valve seat (6). In the body a movable working cylinder (11) is held away from the handle by means of a spring (22) and provided with inlet (15) and exhaust holes, a distribution system (16) and a striking piston (17), cooperating with a working tool. Inside the body is a liner (7) in which the working cylinder is guided by means of two guide collars (10a, 10b) defining with the inner wall of the liner an annular recess, into which there opens an inlet passage (9) interconnected with the handle by means of passages (1a, 6a) in the valve seat and handle. A hollow face of the handle is closed by a flange of the guide bush (23) of the spring, where the supporting face of the plunger (20), which is attached to the working cylinder, is slidingly guided. <IMAGE>

Description

The invention θθ relates to hand pneumatic percussion tools, к

eg a pick-up kltdivt, with reduced vibration nt handles.

As the technical parameters of the hand-held pneumatic percussion tool increase, so does its hygienic adverse effect on * A.

attendant. Some of them are more vibration, which, after a period of action, causes unreadable joint diseases and vasoneurosis. As a result of these professional onemooning, the affected workers are permanently excluded from the production process. Effective personal protective equipment which significantly reduces the transmission of vibration from the tool to the operator's hand is technically efficient. Therefore, technical measures must be taken on the tool itself. The major part of the known and practically used solutions consists

226 230

- 2 in covering the metal parts of the tool handles with a flexible material with low thermal conductivity, mainly rubber. The main effect of these solutions is to prevent the operator's hands from getting cold, which otherwise significantly speeds up the process of vasoneurosis. In addition, the non-metallic flexible handle cover partially attenuates high frequency vibrations of the order of several hundreds to thousands of Hz. However, vibrations at lower frequencies, which are the most hazardous to the health of the operator, cannot be influenced in this way. Other known solutions are based on the principle of dividing the percussion tool into several axially displaceable and mutually suspended parts so that the vibrations on the handle are minimized. These solutions are usually very effective in terms of vibration damping, but their practical use is hampered by the complexity of the structure. They are characterized by considerable complexity and thus by high purchase price given by high production effort and accuracy, they impose unbearable demands on operation and maintenance, they are fault and operationally unreliable.

The above-mentioned disadvantages are overcome by a pneumatic percussion tool equipped with a handle extending into a base body with a lateral inlet channel with a valve seat. In the base body there is held a working cylinder, spring-loaded to the handle by spring and provided with inlet and exhaust openings, a distribution device and a striking piston cooperating with a working tool, which is guided at the actuated end in the housing. According to the invention, the base body is provided with an insert in which the work roller is slidably guided by two guide flanges defining, together with the inner wall of the insert and the outer surface of the work roller, an annular recess into which the opening is in the insert.

The hollow face is closed circumferentially by a flange of a spring guide sleeve in which the support face of the closure fastened to the working cylinder is guided slidingly. The guide collars are provided with sealing piston rings. Also according to the invention, a silencer is mounted on the base body with one peripheral end surrounding the exhaust holes of the working cylinder and holding its opposite peripheral end with a tubular auxiliary hand. cylinders.

By performing the hand-held percussion tool according to the invention, a relatively simple system is formed, the resulting vibrations of which are minimized. The suspension of the working cylinder against the handle by a single spring is sufficient to sense the periodic and non-periodic forces due to compressed air in the working cylinder and the impact of the working tool. By selecting the appropriate spring springs, correctly determining the intact energy of the strike and the number of strikes, optimum determination of the working cylinder hmoonoot and the practical design of the invention, it is possible to reduce the vibration acceleration level over the entire frequency range required. Importantly, the solution according to the invention is structurally simple, cost-effective and easy to manufacture and does not require different operating conditions, operation and maintenance. Auxiliary grip on the front of the tool significantly improves tool handling when working in different directions, especially in cramped mine operations Reducing vibrations on both the main and auxiliary grids reduces the sizing requirements. etí ;

4,226'230 and parts connected therewith to allow the use of light alloys and plastics. This results in a reduction in the overall tool life and thus improves the maadposition properties and the physical demands on the operator. Along with the reduction of vibration, this means higher operator performance without increasing its workload and eliminating the risk of professional 'non-afternoon vibration'. ·

The attached drawing shows a hammer as an example of an embodiment of the hand-held pneumatic impact tool according to the invention, in a partial section through the longitudinal axis.

In the hammer handle side 1, the inlet fitting 2 for connecting the inlet air supply is fixed and a well-known triggering mechanism (not shown) with a trigger valve 2 is mounted in its hollow face. saddle

6. with an inlet channel 9 * In the base body 2 is inserted an insert 2 in which an opening 8 is connected by an inlet channel 9 with an opening of a ventilator seat 6. In the insert J there are two guide bands 10a, 10b. the displacement is limited in the insert 2 from the side facing away from the luoee 1 by a limiting stop 12. In the guide flanges 10a. 10b are recessed in which the piston rings 131a are received. 13b, the seal formed between eh ^ Treatment annular recess 14 that has an inlet opening 15 in the operating cylinder 11, e 1 is connected to a known prostoeem ustrooí manifold 16, which is not shown in detail. The working cylinder 11 with the guide device 16 and the striking piston 17, which moves through the sword upper working space 18 and the lower working space 19, is closed from above by a closure 20 with a support face 21. This face 21 of the closure 20 forms the abutment surface of the spring 22 by which the working cylinder 11 is springed against the handle 1.

The spring 22 is located in the hollow face of the handle 1 in the guide sleeve 23, which does not reach its bottom to the bottom by its cylindrical part. however, by its circular flange it is fixed coaxially with the insert 2 to the base body 2 and closes the hollow face of the handle 1. The inner space of the guide sleeve 23 and the hollow face of the rukooeti 1 radially surrounding this sleeve 23 are connected to the inlet duct 6 by a channel 6a in the venous seat 6 and a connecting channel 1a in the hand. The cavity 24 in the insert 2 of the radially encircling closure 20 is connected to the surrounding atmosphere by a channel 26 in the wall of the insert 2. In the working cylinder 11, a working tool 25 is secured through its shank, secured against unwanted ejection by a cover 28 with a resilient stop 29 and a pivot pin 10. A noise damper 31 is mounted on the base body 2 and the working cylinder 11 is folded around its exhaust apertures 32. The noise damper 31 facing the housing 2 axially fastens the tube-shaped auxiliary handle -33 slidably guided on the surface of the housing 28 and non-rotatably mounted to the working cylinder 11 The hammers according to the invention operate as follows:

The compressed air flows from the inlet fitting 2 in the seat 6, the lateral inlet duct 6 and the inlet 8 into the annular recess 14 after opening the trigger vein 2, and from there through the inlets 15 into the manifold 16. channel 9 is simultaneously led through the channel. 6a in the seat 16 and the channel 1a in the handle 1 into the space of the guide sleeve 23 in the hollow face of the handwheel 1, where by acting on the support face 21 of the closure 20 exerts axial pressure on the cylinder. - air alternately into the upper working space 18 and the lower working space 19 of the working cylinder 11. The striking piston 17 is periodically oscillated by the compressed air, whereby

226 230 is given kinetic energy, transmitted at the dead center of the stroke stroke in the form of an impact pulse to the working tool 27. By the action of compressed air, the working cylinder 11 is also periodically vibrated, in addition to the recoil of the working tool 27. the working cylinder 11 is not transferred to the handle 1 in full size, but to a value greatly reduced depending on the instantaneous deflection of the working cylinder 11 relative to the handle 1, the spring stiffness 22, the damping size and the oscillation frequency. The resulting oscillating movement of the handle 1 is dependent on the axial force transmitted to the handle 1 by the spring 22, the passive resistances and the dynamic stiffness of the worker's hand. By appropriately selecting the type of spring 22 and its stiffness together with optimal determination of the weight of the handle 1 and the working cylinder 11, it is possible to minimize the acceleration of the oscillating movement of the handle 1. In this way, the vibrations of the auxiliary handle 33, which serves to guide and direct the tool at work, are also damped, while the handle 1 is pressed and operated. Detaching and reattaching the housing 28 when changing the working tool 27 is made possible by sliding the non-rotatably guiding of the auxiliary handle 33 on the front of the working cylinder 11 »Tool handling, safety and hygiene further improve the rotatable mounting of the silencer 31 on the base body j the dampers 31 can be directed according to the instantaneous operating conditions and operator requirements. The connection of the handle 1 and the base body 2 by means of screws allows easy assembly and disassembly of the tool without special tools, if necessary also in the workplace, while ensuring sufficient rigidity of the joint and limiting clearances that could otherwise negatively affect the vibration level on the handle. 14 advantageously seal the piston rings. They provide high required tightness with low precision requirements

7,228,230 manufacturing of the liner 2 and the working cylinder 11, in operation, are resistant to seizure due to dirt and the usual lack of pressure. The cavity 24 communicates with the passageway 26 to the atmosphere, thereby preventing unwanted variations in the air pressure therein due to its variable volume due to the oscillation of the working cylinder 11. When the working tool 27 is stuck in the machined material, impact of the working cylinder 11 on the inside. the insertion of the insert 2 is dampened by an elastic limiting stop 12 and likewise the shoulder bumps of the working tool 27 on the cover 28 are illiated by a flexible stop 29 «

The solution of the hand-held percussion tool according to the invention is, besides the benefits already mentioned, a significant possibility of a modular design. In the design according to the invention, the series of hammers of different performance differ only in the length and weight of the piston and the working cylinder, or in the size of the silencer. The fitting components remain the same for the entire product range, which is versatile for manufacturers and consumers alike.

Claims (3)

  1. Object of the invention. . 226 230
    1. Manual pneumatic impact. The handles provided with the handle become a base body. having a side inlet channel with a valve seat, in the base of which a work cylinder is retained, spring-loaded against the handle and provided with inlet and exhaust openings, a distributor and a striking piston cooperating with a working tool guided at the actuated end in the housing; characterized in that the base body (5) is provided internally with an insert (7) in which the working cylinder (11) is slidably guided by two guide collars (10a, 10b) extending together with the inner wall of the insert (7). ) and with the outer surface of the working cylinder (11) an annular recess (14), into which the inlet opening (8) in the insert (7) opens. a channel (9) connected by a channel (6a) in the valve seat (6) · and (1a) in η ^ οόθΐΐ (1) to the hollow face of the handle.
    (1) The hollow face is circumferentially closed by a guide bushing (23) of the spring (22) in which the support face (21) of the closure (20) mounted on the working cylinder (11) is slidably guided.
  2. 2. The pneumatic striking tool according to claim 1, characterized in that the guide collars (10a, 10b) are provided with sealing piston rings (13a, 13te).
    - 9 226 230
  3. 3. A pneumatic impact tool according to claim 1 or 2, characterized in that a noise damper (31) surrounding the exhaust openings (32) of the working cylinder (11) is attached to the base body (5) by its one peripheral end, a circumferential ending of a tubular auxiliary handle (33) guided, on the one hand, slidingly on the surface of the cover (28) and, on the other hand, non-rotatably on the working cylinder (11).
CS317481A 1981-04-28 1981-04-28 Manual pneumatic percussive tool CS226230B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CS317481A CS226230B1 (en) 1981-04-28 1981-04-28 Manual pneumatic percussive tool

Applications Claiming Priority (11)

Application Number Priority Date Filing Date Title
CS317481A CS226230B1 (en) 1981-04-28 1981-04-28 Manual pneumatic percussive tool
GB8210031A GB2098531B (en) 1981-04-28 1982-04-05 Hand held pneumatically driven percussion tool
DE19823212701 DE3212701A1 (en) 1981-04-28 1982-04-05 Pneumatic handshake tool
SU827772353A SU1256952A1 (en) 1981-04-28 1982-04-06 Hand-held pneumatically actuated percussive tools
FI821244A FI821244L (en) 1981-04-28 1982-04-07 Pneumatiskt handslagsverktyg
DD23883282A DD236641A3 (en) 1981-04-28 1982-04-08 Hand-held pressure gun tool
HU126682A HU192751B (en) 1981-04-28 1982-04-21 Pneumatic manual impact tool
FR8207149A FR2504440B1 (en) 1981-04-28 1982-04-26
CH251282A CH655037A5 (en) 1981-04-28 1982-04-26 Pneumatic handshake tool.
AT0163682A AT383077B (en) 1981-04-28 1982-04-27 Pneumatic handshake tool
SE8202626A SE8202626L (en) 1981-04-28 1982-04-27 Pneumatic impact tools

Publications (1)

Publication Number Publication Date
CS226230B1 true CS226230B1 (en) 1984-03-19

Family

ID=5371058

Family Applications (1)

Application Number Title Priority Date Filing Date
CS317481A CS226230B1 (en) 1981-04-28 1981-04-28 Manual pneumatic percussive tool

Country Status (11)

Country Link
AT (1) AT383077B (en)
CH (1) CH655037A5 (en)
CS (1) CS226230B1 (en)
DD (1) DD236641A3 (en)
DE (1) DE3212701A1 (en)
FI (1) FI821244L (en)
FR (1) FR2504440B1 (en)
GB (1) GB2098531B (en)
HU (1) HU192751B (en)
SE (1) SE8202626L (en)
SU (1) SU1256952A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2540418A1 (en) * 1983-02-07 1984-08-10 Helliot Bernard Improvements made to percussion apparatuses
DE3319875A1 (en) * 1983-06-01 1984-12-06 Licentia Gmbh Electropneumatic hammer drill
JPS60501698A (en) * 1983-06-29 1985-10-11
SE460266B (en) * 1986-05-12 1989-09-25 Eskil Sundstroem Vibration protection for a motor vibration lure
EP0471649A1 (en) * 1990-08-16 1992-02-19 SIG Schweizerische Industrie-Gesellschaft Fluid pressure-operated hammer
WO1993006972A1 (en) * 1991-10-09 1993-04-15 Sovmestnoe Sovetsko-Finskoe Predpriyatie Rpf-D Pneumatic hammer
GB9206978D0 (en) * 1992-03-31 1992-05-13 Compair Power Tools Improvements in pneumatic power tools
DE19746447C2 (en) * 1997-10-21 2002-11-07 Biax Maschinen Gmbh Steckborn Hand tool with a linear vibratory drive

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1059349A (en) * 1951-09-07 1954-03-24 pneumatic hammer
DE963948C (en) * 1952-05-03 1957-05-16 Hauhinco Maschf Pneumatic hammers with push handle
US2899934A (en) * 1956-01-19 1959-08-18 salengro
US3456744A (en) * 1967-11-24 1969-07-22 Samuel Altschuler Vibrationless pneumatic tool
DE2334817B2 (en) * 1972-10-03 1976-03-11 Hand operated pneumatically-hitting machine
DE2424136B2 (en) * 1974-05-17 1976-09-02 Drucklufthammer
FR2272797B1 (en) * 1974-05-30 1977-03-11 Inst Mekhanizirovannogo I Ruch
GB1587611A (en) * 1977-10-14 1981-04-08 Secretary Industry Brit Resilient mountings for fluid reciprocated tools
FR2454875A1 (en) * 1979-04-25 1980-11-21 Pt Instit Portable pneumatic percussion tool - has conical spring fitted between valve plate and inlet tube to absorb shocks
FR2456593B1 (en) * 1979-05-15 1982-07-23 Montabert Roger

Also Published As

Publication number Publication date
HU192751B (en) 1987-07-28
GB2098531B (en) 1984-06-13
ATA163682A (en) 1986-10-15
DE3212701A1 (en) 1982-11-11
AT383077B (en) 1987-05-11
GB2098531A (en) 1982-11-24
SU1256952A1 (en) 1986-09-15
DD236641A3 (en) 1986-06-18
FI821244D0 (en)
FI821244A0 (en) 1982-04-07
CH655037A5 (en) 1986-03-27
FI821244L (en) 1982-10-29
FR2504440A1 (en) 1982-10-29
SE8202626L (en) 1982-10-29
FR2504440B1 (en) 1984-10-26
FI821244A (en)

Similar Documents

Publication Publication Date Title
US4800965A (en) Damping element, and its installation in a motor-driven hand tool
US7588097B2 (en) Power impact tool
US9999967B2 (en) Striking tool
CN102458777B (en) Power tool
US6997293B2 (en) Front fork of motor cycle
EP1226903B1 (en) Electric hand tool with idle running switch off
ES2321942T3 (en) Work apparatus with suspension in the handle.
US6062324A (en) Fluid operated vibratory oil well drilling tool
CN1248832C (en) Impact driller
CN101688435B (en) Hydraulic breaker assembly
CN1762667B (en) Hand-held type tool machine with vibration-damping gun shape grip
CN101585184B (en) Vibration dampened holder for additional hand grip
US7328753B2 (en) Hydraulic breaking hammer with lubricated implement guide sleeve
FI62480B (en) Slaganordning
DE602004008987T2 (en) A drill device
EP0828575B1 (en) A pneumatically powered fastener installation tool
US6431290B1 (en) Electric hand tool device with idle strike cutoff
US3788404A (en) Pneumatic impact tool
US4290492A (en) Idling and air replenishing system for a reciprocating hammer mechanism
EP1415768A1 (en) Oscillation damper
US4068727A (en) Method and device for damping the recoil of a work tool connected to a rock drilling machine
JP5560004B2 (en) Work tools
US6149356A (en) Portable pneumatic tool assembled with module units
US5749421A (en) Pneumatic impact breaker
US4624325A (en) Apparatus for dampening the recoil of percussion tools