DE2633955A1 - AIR HAMMER - Google Patents

Description

Vsezoyusnyj nautschno-issledowatel- July 28, 19? Ö

skij i projektno-Konstruktorskij in RZ / B

stitut mechanisirowannowo i slip- P 54 913a

nowo stroitelno-montaschnowo instru-

menta, wibratorow i stroitelno-otde-

lotschnych maschin, ■ ^ .ΓΤξ ~~ 3h /. "Λ

Chimki Moskowsko j oblasii / USSR '_ ; Λ · η njchngggn ^ j yvWe? T V

PBBSSLOi ¹ IHAMiEH

iJie present invention relates to men with blowout, especially jackhammer, which j.n Vürjchiedenen Branches of industry, mainly in construction and in the

r - ':. a -um Jibschrot -'- an from Iiietali | None of welds and (cleaning) for

■ Ire men / of casting blocks and / preparation of metal for the

are used, and provides a VervolikoEmnung ^of: reelufthammers according to the DT - constitutes AG 24-24203.

In the above-mentioned DT-AS a jackhammer is used

Running gear, anti-retaining a housing; a / pipe, soft

Arranged longitudinally displaceable in the housing and one
is intended for receiving / working tool with 8inem collar f

a percussion piston, which _m iiohn ax ^ o arranges xst and sub the effect of Pre.

tion
acts; Fixed To a uiigoeinrieh ^ / for the Arbeitswexkzeug that a arrange on the SOHS diah ^ ar at e ^ th lock with a non-circular

709809/0301

BATH ORIGINAL

Has opening for the passage of the working tool, Vveiche-s the oeitenflache carries a pen, as well as a hood, which in the Housing is arranged and cushioned in the axial direction. The hood encompasses a bushing with the formation of an annular gap and is in ilirem

χ -ί

front (part provided with a non-circular opening

in the side wall of the hood are inside and outside

incorporated grooves, which are connected to each other and into which the lock pin enters. This jackhammer gev; uhi ^s -

for
provides a vibration protection / the left hand of the worker, the control of the tools during operation as well as complete operational safety »

When operating this jackhammer, however, it was found that the side wall of the hood, which its opening

-ι

forms out of round, while the work tool is constantly in contact with the side surface. This can under the action of friction, especially at

strong radial pressure on the hood, overheating of the areine
are beitswerkzeugs and consequently ^ -whose / Entfestigen and bending as well as wear of the side wall of the hood caused · In addition kanntim region of the B _a stirring of the side wall of the hood and the work tool, a vibration transmission from the working tool on the hood and further on the .arbeiterS 'in Moment of the highest radial pressure on the hood / occurs · Dit »Vibration transmission is also associated with a strong friction at this point ·

709809/030 « o _MINALIK

the formation of the opening is not round in the front part of the hood an additional time

and effort requiring work.

the

The present invention aims at the addition (s). Disadvantage.

Invention is based on the object, a of the type mentioned at the beginning

Jackhammer / to create in which an immediate surface the

Touching the inner / side wall of the front part of the naube and the side wall of the work tools is excluded, whereby prevents vibrations from being transmitted to the worker via the hood, simplifies the manufacture of the hammer and reduces wear the hood is reduced »

The problem is solved in that in one

Barrel jackhammer, containing a housing, a / iohr, soft

longitudinally displaceable bar arranged in the housing and

is intended to accommodate a work tool with a collar, a percussion piston, which is arranged in the drill and below.

eier action of the compressed air interacts with the work tool

tung _mm »

a fastening device / for the work tool that comes with a on the drill rotatably arranged lock with a non-circular opening is provided for the passage of the working tool, which Carries a pin on the side surface and one in the housing arranged, sprung in the axial direction and the closed under A hood encompassing the formation of an annular gap, which has a non-circular opening on the insertion side of the working tool and a side wall with interconnected transverse and longitudinal grooves, in

7098Q9 / 030S

which the lock pin enters, according to the invention _{intermediate members are arranged between the front T 8} ^ of the hood and the working tool, which are in contact with the working tool and are designed as rotational bodies that are rotatably arranged in the hood and form an opening in it which is not round Cross section. of the work tool.

Due to the arrangement of the rotating body Intermediate links between the hood and the working tool wild the transmission of vibrations to the naübe and consequently to the

by

Hands of the worker / work tool reduced, in which <^ ine

the one

High frequency vibration> inf olge / hohea. Tensions in the tool? Impact / and ^ a ine low frequency vibration? as a result of the relocation of the tool when there is a movement after the impact and when the tool bounces off the workpiece to be machined is generated by the elastic deformation.

±> a the intermediate links are rotatably arranged, the Sliding friction of the tool on the hood caused by an enormous weaker rolling friction replaced.

As is well known, with the reduction in friction, the

Reduced vibration transmission. Also, it is warming the hood and the tool reduced, whereby the wear of the hood as well as defeat and bending of the tool avoided turning

The intermediate links are expediently designed as roles 709809/0308

stalten, which from the hood in the radial direction from the side wall cash out.

According to one of the variant embodiments of the invention the shoulds are arranged crosswise in at least two axially spaced planes This allows the production technology of the hood and its repair to simplify, which in the proposed construction is limited to changing the rollers »

According to another embodiment of the invention the intermediate links are arranged in a replaceable insert fastened in the hood. This allows the manufacturing technology the hammer and its repair even more to simplify. The deposits including the intermediate break down centrally, and to eng spare parts belong to the hammer.

The invention V characterizes / is further characterized ^ that the insert is arranged in a sleeve which is made of a polymer material and forms part of the hood.

how
Since f ₁ is generally known, materials with increased

en
Thermal conductivity vibration ^ is transmitted most intensively »

the vibration transmission i'orm reduced to the worker by the formation of a portion of the hood in a HÜise of a polymer material having low thermal conductivity, which in combination \ creating a highly effective pneumatic hammer allows tion with the above proposed constructive mistletoe.

709809/030 «

Thus, the proposed compressed air has the following advantages compared to the known ones:

- reduced vibration transmission to the left hand that Worker;

- increased reliability of the hammer and tool life;

- Simplified production technology of the hood, since the change <n non-circular opening is formed by intermediate links;

- Simplified repair of the hood, there / only the insert with the intermediate links must be replaced. <^ without Replacing the hood itself, which has milled transverse and longitudinal grooves

The invention is illustrated below. a concrete one

Embodiment of the pneumatic hammer with reference to the

closer..
accompanying drawings / explainedJ it shows:

Fig. 1 - the pneumatic hammer according to the invention, in part Longitudinal section;

FIG. 2 shows a section along the line II-II in FIG. 1, on an enlarged scale;

Fig. 3 - a section along the line III-III in Fig. 1, on a larger scale;

Fig. 4- - a variant of the pneumatic hammer with an insert;

Fig. 5 - a variant of the pneumatic hammer with a sleeve

The jackhammer contains a 709809 / 03Oi provided with a handle 2

Barrel housing 1 (Fig. 1), in which a / tube 5

bängsver is arranged slidably, which is a guide axis 15 owns. A working tool 6 is arranged in the socket 15, which has a shaft 6a and a £> and 24.

The section 6o of the working tool 6 located below the shaft 6a has a non-round shape in cross section, which is formed by flattened areas ^ P (Fig. 2, J5) , which cooperates with the shaft 6a of the .Arbeitswerkzeuge 6 under the action of compressed air, which from an Luftden

distributor (not shown in / FIG.) is supplied.

"tune .. In the jackhammer there is a - ^ efestigungseiirich / for that

Working tool 6 is provided, which contains a lock 18, As rotatably arranged on the pipe 5 and as a pipe fÖ £ taigas

is. The _z

". Parliament formed / lock 18 has an opening 20

non-round to the passage of the working tool 6 and

a cavity for receiving the collar 24 the work tools 6 on.

In the lower part of the housing 1, a hood 16 is rotatably arranged, which surrounds the lock 18 in such a way that a ring slot 21 is formed between them. The spring 38 is loaded and has an annular groove (^ uernut) 37 (JPi (J.- 4, \ i) i and lengthways 36, which are connected to one another and into which a pin 34 attached to the lock 18 enters (Fig . 1).

709803/030 «BADORiGINAL

An opening 51 is formed in the front bil of the hood 16, through which the working tool 6 is pushed, its section 6c, which is uncunder in cross section, comes ^{to lie in this opening 51.}

The transverse groove 37 (EIg · 4-, 5), the longitudinal grooves 36 and the Pin 34 form a device for attaching the .Arbeitswerkzeugs 6 in the hammer, through which the mutual position of the hood 16 (Fig. 1) and the lock 18 is determined »

According to the invention are between the opposite part of the hood 16 and the working tool 6 intermediate links 52 arranged, through which the contact between the work tool 6 and the side wall 53 of the hood 16, which the opening 51 of the hood forms, is excluded. The intermediate links 52 are designed as bodies of revolution, e.g. rollers 54 (Figs. 2, 3) or cylindrical rods and stand with the side surface of the working tool 6 in touch.

The lobes 54 are rotatably arranged in the hood 1o and form an opening 23 in the opening 51 of the hood ″ 6 out of round, which corresponds to the cross section of the section bc of the working tools ί oni ^ ricnt.

The pollen 54 are _ri c : - "Ch_. .Er. Ien £ .-: arbonrunGen ^ arranged, where ede Bohru: ^ · -> 5 LIa opening 51 of the ^ & ube 16 through without iden, wocurch ^ ..:. ^ el.yil ier Bohru>·.; en 55 the grooves

56 (Fig. 2, 3) are formed, weici-ie to the opening

there
51 / are open.

709809/030 «

ßAD ORIGINAL

· Is the Bollen 54 ran / in the bores 55 ^ eVi whereby "its rotation allows Such a configuration of the bores 55 54 project the rollers out of the hood 1c in the radial direction from the side wall 53 out _s as shown in Hg · 1-5.

According to one of the embodiments of the invention

eren

the rollers 54 in two or more / axially in .Abstand from each other arranged lying levels, the rollers 54 crosswise are arranged, ζ · Β · the roles of one level <lie> perpendicular to the roles of the other level »as in

Pig, 2, 3 shown.

According to another embodiment of the invention, an insert 57 is arranged in the opening 51 (FIG. 4) of the hood 16, which in the opening of the hood 16 with the possibility rather later exchange for another deposit on a be

any known manner attached wx & _e In the insert 57, the intermediate _{links 52 or e} the rollers 5 ¹ ^ (Fig © 5) are arranged in the manner described above © -

.Außerdem the hood 16 (B ¹ Ig ₀ 5) consists of two parts 58, are executed 59, to the one of which 58 is fixed to the housing 1 and the andäre part 59 la Fo ^ s a sleeve made from a polymeric material and part of 58 of the hood sufein any®! is known V / else attached © This "-st represents sleeve in the inside hand, Z ₉ Be © © in Bingnut incorporated _g in which the insert 57 with the Daris, b © ^ © fiadliohen Solion 5 is ageordnet"

7Q9809 / 03 & 6

- ίο -

The jackhammer works as follows.

To introduce the working tool 6 (FIG. 1) into a jackhammer, the worker presses on the hood. \ / he »* pushes this towards the housing 1. The pin 34 (FIG. 4) of the lock 18 emerges from the longitudinal groove 36 and goes into the transverse groove 37. The worker rotates the hood 16 around the longitudinal axis of the pneumatic hammer until the pin 34 comes into a fixed end position in the transverse groove 37. The work tool 6 is then freely inserted by the worker through the non-circular opening 23 (FIGS. 2, 3) of the hood 16 formed by the rollers> 4 and through the non-circular opening 20 (FIG. 1) of the lock 18.

Thereafter, the worker can by rotating the hood 16 in the opposite direction and by releasing it from the axial pressure the hood 16 under the action of the spring 38 in the Come back to work position in which the pin 34 (Fig. 4) in a of the longitudinal grooves 36 3 is received.

Compressed air is then let in from the air distributor (not shown in FIG. 1) and the percussion piston B performs a reciprocating movement, which interacts with the shaft 6a of the working tool 6 and this in the

Tube 5 and in the opening 23 of the hood 16, in which the

reciprocating work tool 6 cooperates with rollers 54 (Fig. 2, J) ;

Since the rollers 54 in the radial direction

protrude from the side wall 53 of the hood 16 inward and since the rollers 54 are rotatably arranged, the

709809/0308

Sliding friction of the working tool 6 on the side wall 53 of the Hood 16-by rolling friction of the working tool 6 on the Roles 54- replaces »This leads to a reduction in the transmission of vibrations from the work tool on the hood 16 of the hammer on the hand of the worker. Also, the reliability of the hammer and the service life of the work tool increased.

Pneumatic hammers with hoods 16 according to FIGS. 4 and 5

work similarly as described above. It should be noted that the structural design of the pneumatic hammer shown in FIG the heat transfer from the hand to the hood - “■ ve se nt borrowed, which is known to reduce the probability Damage to health caused by vibration is reduced without the use of additional thermal protection.

709809/0306

Claims (4)

MOfJO wüiiCiitiw 2 -; - P 54- 91 July 28, 1976 RZ / B ¥ 633955 - 12 - PATENT ALTITUDE Barrel ·) jackhammer, containing a housing, eii / ^ ohr, which can be moved lengthways in the housing one
arranged and provided for .aufnahme / work tool with a collar, a percussion piston which is arranged in the head and under the action of compressed air with the work "cung" ■ v.orkaeug cooperates, a BafusuigungseiDricH / for work zeu
werk4 ', with a lock rotatably arranged on the tube «(With a non-circular opening for the passage of the ure <. "■ -"> is provided ^ which on the side _{face a pin tra "t} ./ö,i as well as a housing arranged in the axial direction from-j-efe..erte and encompassing the lock with the formation of an annular gap üaube, the ^ a non-round opening ^ on the introduction side of the work tool <- "* and a side wall with interconnected transverse and longitudinal grooves into which the lock pin enters, characterized in that between the front! part of the hood (16) and your .Arbeitswerkzeug (6) intermediate members (i> 2) are arranged which are in contact with the working tool (6) and are designed as rotational bodies which are rotatably arranged in the hood (16) and have an opening (25) out of round form, which corresponds to the cross section of the work tool (6). ♦ 2. pneumatic hammer according to claim 1, characterized in that that the intermediate links (52) are designed as lumps (54), 709809/0306 which <(of the hood (I6)> in the radial direction out of the sixth wall (53) / h ^{9i; 9USJ:! a} g9B ·· 3 · pneumatic hammer according .Anspruch 2, characterized in that the Bollen ₉ (54) are arranged in at least two spaced-axially spaced planes crosswise. 4. jackhammer according to _ claim 1 ₉ or 3 ■
2 / characterized in that the intermediate links (52) are arranged in an insert (.57) ₈ which are in the hood (16) is exchangeably attached. 5. Pneumatic hammer according to claim 4- _f, characterized in that the insert (57) is arranged in a sleeve which is made of a polymer material and forms part of the hood (16). 709809/0306 Blank page