Elongated-member-driving apparatus – With means to move or guide member into driving position – Including supply magazine for constantly urged members
Patent
1981-11-23
1984-10-09
Yost, Frank T.
Elongated-member-driving apparatus
With means to move or guide member into driving position
Including supply magazine for constantly urged members
173139, 227156, B25C 104
Patent
active
044756801
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a driving apparatus for fastener elements, such as nails to be driven into a work piece.
2. Description of the Prior Art
In driving devices of this type the excess driving energy or the driving energy of idle strokes is taken up and dissipated by an impact buffer made of elastic material. However, in such devices a very loud impact noise is generated which is radiated by the buffer through the housing to the environment. The operator is exposed to a substantial nuisance by this impact noise due to its high intensity and the high stroke frequency. Thus, it has already been attempted to reduce this noise by using impact buffers of relatively soft, elastic material. It is also known to coat the housing and other parts of the driving apparatus, which are normally made of light metal, with a suitable damping material.
Impact buffers made of soft material, however, have a high wear and tear and must be quickly replaced. Additionally, depending on the solidity of the work piece, for example, of wood, the fastener means may be driven to differing depths where an impact buffer of soft material is used. Such a feature is especially disadvantageous, for example in connection with nails having visible nail heads.
A coating with damping materials is not possible with regard to all parts of the driving apparatus. Thus, in such an instance the noise damping is only incomplete.
OBJECT OF THE INVENTION
Accordingly, it is the object of the invention to provide a driving apparatus for fastener elements in which the damping of the impact noise is as large as possible without impairing the customary useful life of the impact buffer.
SUMMARY OF THE INVENTION
This objective has been achieved in that a housing insert having a pot shape is arranged between the main outer housing member and the driving cylinder.
This housing insert prevents that the impact noise is transmitted to the housing and thus to the environment. The housing insert is separated from the inner wall of the main body in the area of the impact buffer. The impact buffer rests on the bottom of this insert. If the housing insert is made according to the invention of a synthetic material having a high inner damping, the excess impact energy and thus also the impact noise, are dissipated to a large extent already in the housing insert.
Accordingly, the excess impact energy cannot be transmitted to the outer housing member and the latter can be made of a less expensive material. The housing can also be so constructed that its manufacture is more economical and so that the entire driving apparatus may have a smaller weight.
BRIEF FIGURE DESCRIPTION
An example embodiment of the invention is described in more detail in the following with reference to the drawing, wherein the single FIGURE shows a driving apparatus according to the invention partially in section.
DETAILED DESCRIPTION OF A PREFERRED EXAMPLE EMBODIMENT AND OF THE BEST MODE
OF THE INVENTION
A driving apparatus comprises in a known manner an outer housing member 1 including a pot shaped main housing body 2 and a hollow handle grip 3 connected to the housing. Air pressure is supplied through the handle grip 3 from a source of air pressure not shown. The main housing body 2 is closed at the top by a housing cover 4.
The main housing body 2 comprises forming a shoulder against its upper zone a recess 5 in which a pot shaped housing insert 6 is supported by means of a ring flange 7 of the insert 6. A snap ring 8 holds the flange 7 of the housing insert 6 against the shoulder in the outer housing body 2. The cross-section of the housing insert 6 is so dimensioned that an intermediate space 9 is present between the main housing body 2 and the housing insert 6.
The housing insert 6 comprises at its impact facing end a slanted bottom 10. An impact buffer 11 of elastic synthetic material rests on the slanted body 10. The intermediate space 9 extends also in the area of the bottom 10 and the main housing body 2.
The housing inse
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Fasse W. G.
Kane, Jr. D. H.
Karl M. Reich Maschinenfabrik GmbH
Phan Hien H.
Yost Frank T.
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