FR2520286A1 - PROTECTIVE DEVICE ON DEGAUCHISSEUSE - Google Patents

Abstract

1. A guarding device for a wood planing machine with a movable guard bridge (6) disposed above the table (2) of the planing machine and permitting the portion of the tool-shaft (3) located in front of the work-piece guide to be covered, means being provided for adjusting the height of the bridge (6), to permit the passage of the wood to be planed, and to permit it to move vertically whilst remaining parallel to the table (2), the guard bridge (6) being supported by an element (7) having a substantially vertical rectilinear guide (4, 5) characterised in that the rectilinear guide (4, 5) is effective along a single vertical axis and in order to immobilise the guard bridge to prevent it from rotating, is combined with a supporting mechanism by at least two levers (8, 11) located in the same vertical plane and connected together by at least one intermediate articulation shaft (10), one lever (8) being articulated by a movable shaft (9) to the supporting element (7) of the guard bridge (6) and another lever (11) being articulated by a fixed shaft (12) to a support (1) rigid with the frame of the planing machine, the guard bridge (6) being moved automatically upwards to a pre-adjusted height, under the effect of return means (13).

Description

DESCRIPTION

  The present invention relates to a device adapting to jointer and to cover by a bridge the portion of the tool shaft located at the front of the part guide

  and to adjust this bridge in height for the passage of timber to be de-

warp.

  Known protective devices of this kind

  to control the movement of the protective bridge,

  deformable parallelograms or compasses, or guides

  straight lines which do not insure alone and separately

  sufficient rigidity and good control of the

automatic bridge.

  The device according to the invention combines a recom-

  tiline with parallelogram guidance or compass,

  so much rigidity, a compact construction and a good

  Controlling the displacement of the protection bridge.

  According to a preferred embodiment the bridge of

  protection is fixed in a column moving vertically.

  On this column a lever is fixed by an axis A second

  lever attached to the first axis is secured to the support

  a guide to the vertical column, by a third axis.

  According to variants, the levers are doubled to constitute

  parallelograms or form between them different angles.

  FIG. 1 is a profile view of a device

according to the invention.

  FIGS. 2 to 3 are a side view of

laughing parts of the device.

  The device shown in FIG.

  port (1) attached to the jointer and in which slides the

  column (2) to which the bridge (3) is fixed by

intermediates.

  A lever (4) integral with an axis (5) of the assembly co-

  lonne-pont is coupled to a second lever (6) by the axis (7), the other end of the lever (6) pivoting on the support (1) by the axis (8) A spring (9) tends to raise the column

(2) and the bridge (3).

  A cam-stop (10) pivoting on the axis (11) is integral with the

  lever (12) and limits the travel of the assembly

  bridge column upwards by stopping the lever (6).

  If a cause tends to press the bridge (3) this one

  will come to flatten on the tables of the jointer in com-

  priming the spring (9) and resume its original position

under the thrust of this spring.

  In the embodiments according to Figures 2 to 7

  the angles formed by the levers, as well as their number

  The operation is identical to that of the invention

tion

Claims (2)

CLAIMS / Protective device by bridge of the tool-carrier shaft of jointers having a bridge guiding mechanism constituted by the combination of a rectilinear guidance column (2) and a guide levers (4) and (6) articulated together by the axis (7) and ensuring the connection of the colon (2) to the frame (1) by the axes (5) and (8). / Apparatus according to claim 1 characterized in that the levers (4) and (6) are linked between them by two other levers (13) and (14) constituting a pantograph type system.   3 / Apparatus according to claims 1 and 2 characteris-   in that the ascent of the bridge (3) is controlled by a res-   fate (9) and a stop cam (10) pivoting on the axis (11) and   secured to a lever (12) that the operator can maneuver.   4 / Device according to the preceding claims of which   the return spring (q) of the bridge is applied to one of the levers   (4) or (6) or (13) or (14) or on one of the axes (5), (7) or (8).