Tool driving or impacting – Including means to vibrationally isolate a drive means from... – Handle type holder
Patent
1999-06-25
2000-11-21
Vo, Peter
Tool driving or impacting
Including means to vibrationally isolate a drive means from...
Handle type holder
173211, 267137, B25D 1700, B25G 100
Patent
active
061489301
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a breaking and/or drilling hammer with a handle which is resiliently biased with respect to the hammer casing.
2. Description of the Related Art
The previously known resiliently biased systems for reducing the vibration transmitted to the hand and arm are configured such that an angular offset between the device and the handle is prevented, or the longitudinal springing in the direction of action of the tool and the lateral springing are designed to be approximately equal and rather hard, with the result that the damping of the vibration leaves something to be desired.
In addition, fixed springing having an invariant spring characteristic and a relatively short spring travel has proven to be disadvantageous, since it does not allow adaptation to different operating conditions, such as, in particular, the type of material to be worked.
GB-A-565,783 discloses a hammer with a handle which is resiliently biased on all sides with respect to a hammer casing in a manner such that it can move to a limited extent, and which can be displaced to a limited extent with respect to the hammer casing along two rectilinear guides. Each of the rectilinear guides has a guide rod and a guide sleeve, between which a rubber element is arranged for the purpose of springing, this rubber element being loaded in shear when the hammer is operated. Because of the shear forces, there is the risk that the connection between the handle and the hammer casing will become detached. Because of the slight guiding action of the rectilinear guides, the hammer is, moreover, difficult to handle.
Another vibration-insulating handle connection design is disclosed by DE-A-39 13 971, but this was developed for hand-held abrasive disk grinders and is not suitable for use in hammers in which primarily high forces act in the longitudinal direction of the hammer.
Further examples of vibration-damped handles will be found in U.S. Pat. No. 4,401,167 and EP-A-0 066 779.
OBJECTS AND SUMMARY OF THE INVENTION
The object of the invention is to configure a breaking and/or drilling hammer with a handle which is resiliently biased with respect to the hammer casing in such a way that, with a simple and cost-effective design, it provides the most effective possible protection of the hand and arm against the tool vibration and, in doing so, permits, on the one hand, damping which is effective in all directions and preferably in the axial direction of the hammer, yet at the same time the reliable guidance of the tool as well, the intention being to enable a certain angular offset between the device and handle, in spite of linear guidance.
In order to improve the ability of the device to be guided, the intention is, moreover, to enable a distinct difference between the lateral springing and the longitudinal springing of the tool to be implemented. In addition, there should be the possibility of adapting the device to different operating conditions by means of any desired selection of the spring characteristic, for which purpose a longer spring travel than hitherto is also intended to be permitted.
This object is achieved by at least one rectilinear guide which extends parallel to the longitudinal axis of the hammer, along which the handle can be displaced to a limited extent with respect to the hammer casing and with respect to which said handle is sprung on all sides so that it can move to a limited extent; according to a preferred embodiment, the handle has a U shape with essentially mutually parallel legs turned toward the hammer casing, there being in each leg a rectilinear guide enclosed by said leg.
On the one hand, this permits good guidance of the device, while the springing, which is effective on all sides and preferably in the axial direction, also permits an angular offset between device and handle.
A further advantageous refinement is that each rectilinear guide comprises a guide rod which extends essentially parallel to the longitudinal axis of the hammer casing and project
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Berger Rudolf
Maurer Thomas
Calve Jim
Vo Peter
Wacker-Werke GmbH & Co. KG
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