LU84881A1 - NEW PORTABLE TOOL STRUCTURE WITH VIBRATING TRAY - Google Patents

Description

The present invention relates to portable tools equipped with a vibrating plate, such cyP pie tools this grinding or this sander.

Flus specified, the invention relates to tools of the type ccrocrrant a bs -’- t ^ ve in · -'.- · --- r ‘* ----‘ r-'rarit. a r.c- their, exer.ple an electric motor, and cr.

- driven brant because the rotator lor a movement ^ -, -,.

^ • snt alternative rectilinear or else stion a movement o · * · »- ,; * .g]

The tools of this kind known hitherto, 10 in particular the sanders, comment class: 3üûr. ^ - css pi ~ liers or elastic posts, joining the bgf ’to the p'a-teau. From gu electric motor loaé · · * "18 Dell f a rotational movement is t ^ a ^ sris è a" =.

- ·· * eccentric comprising two non-alienated journals corr ^ i, - u J. one is rotated on the trécite frame, and of which i <.

^ '- The other is engaged in rotation in a block that is transmitted; ··· -. -, -jon cooperate with the plate via a cl ·; c - x, - slightly oblique side. When the block ^ ^ u this transmission is free in its slide, the plateÊU is mouse 2û to an alternating rectilinear movement. ‘“ ^ Sns are provided to allow the immobilization of the transmission biDc in its slide, when we want * + -, - * l-l ciXlSITiti w l! fc * - on the plateau an orbital movement in corresponDonr-v-n - ^ • ‘Exact curve with the movement of the eccentric pin associated with 25 transmission blocks.

Such a construction is old; it is described for example in American patent 2 £ 53,177.

Many tools have been built incorporating such a structure. In general, the tray is simply made of a relatively thick plate, and its lower part is most often covered with a mat of an elastic absorbent material. This fixing means are provided above the plate to fix the edges there! an abrasive basket sheet,

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v 2 On the other hand, in the most perfected tools, these suction means are provided p0, r eliminate the abrasive and abraded dust resulting in, - work of the tool; to do this, these £ £ 5S-5 pipes cross the plateau and are brought together by a suitable connection to a circuit that is the frame. A suction circuit ccnoorte ^ - * ς v cl) lowcu “sowing a suction fan driven by the electric motor. Of course, it is necessary that during the vibrating movement of the plate, the sealing of the suction circuit between the plate and the frame remains assured.

Finally, it is necessary that the connection of these elastic pillars to the vibrating plate is extremely robust and that it cannot vary during dullness.

‘5 The present invention relates to a new tray structure for a tool of the aforementioned tyoe, this new structure being remarkably simple, effective and inexpensive, and making it possible to optimally perform the aforementioned functions.

Another object of the invention is a tray structure allowing rapid assembly of the various constituents of the tray, this structure being, after * assembly, particularly compact and robust.

A more specific subject of the invention is a mobile platform structure for a tool of the aforementioned type, characterized in that it essentially comprises a lower base and an upper plywood, assembled together, the base and the plywood having homologous reliefs used for locating and retaining the accessory organs.

A first recess in the base cooperates with an opening in the plywood to serve as a slide for the transmission block.

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3 Other recesses in the base, cooperating with other openings in the counterplate, are used for retaining ^ and for fixing these elastic pillars, which have projecting feet engaged in recesses-5 irents of the base and retained by the backplate.

Other transverse cross sections of the base, cooperating with these edges and the counterplate, serve as a hinge for these elastic wire fasteners forming clips for clamping the edges of an abra-10 sif basket sheet mounted under the tray.

According to another particular feature of the invention, 1 eirjDcse comprises case Cc ^ nciux c'asoiracion emerging from GûHS 012 V0Γ uU3Γ Θ 0ü CO., JT. J * T "i i. C ci Î! 2.0Γ: £ V6C UP0 C1 - ^ u'-2 2Γ0 counterpart of the plywood, the latter being itself, 15 by means of a friction joint integral with the frame, placed in communication with a system that is housed in the frame; thus, the plate serves this friction-tight surface to the suction circuit when it passes from the plate to the frame of the tool.

Preferably, according to another characteristic of the invention, the base is made of a material ”.

molded plastic, robust and rigid, and the plywood is made of stamped metal, especially stamped steel. The assembly of the plywood and the base is then done using rivets from molding with the base and cooperating with corresponding openings of the plywood, the crushing of the head these heat rivets making fixing the base and this plywood.

30 Other characteristics and advantages of this invention will appear during the description which follows, with reference to the appended drawings given by way of nonlimiting examples. In these drawings: In i 4 - Figure 1 shows in axial cross section a sander, of the double-acting and suction type, incorporating the features of the invention; - Figures 2, 3 and 4 are these effec-5 cuts killed respectively along the lines this shots II-II, and IV-IV of Figure 1; - Figure 5 is a top view of the plate fitted to such a sander, the structure of this plate constituting the essential of the present invention; 10 - Figures 6 and 7 are these cuts made respectively along the cutting lines VI-VI and VII-VII that of Figure 5; - Figure 6 is a top view of the plywood forming part of the tray according to the invention; FIG. 5 is a view on the left of this plywood; - Figures 10, 11, are these respective sections along the section lines X-X and XI-XI this Figure 8; FIG. 12 is a view from above of the base of the plate; > - Figures 13 and 14 are respectively a * section along the section line XIII-XIII ce Figure 12, and a side view along the arrow XIV.

FIGS. 1 to 4 represent a double-acting, suction sanding machine. This type of tool is generically known in itself. The case of a sander has been chosen only by way of example, the invention finding an application in any tool carried in which a plate receives a vibration movement whether it is a movement straight back and forth or in an orbital motion.

The sander these Figures 1 to 4 coirrorte in a manner h 5 known in itself a frame E on which is mounted an electric motor K, whose axes a, vertical, drives, by means of a belt c an eccentric 10 mounted on the bStï B by a first pin 11 and transmitting by means of a second pin 12, offset from 11, an alternating or orbital movement to a plate this sanding this general reference P.

The transmission by movement of the pin 12 to the ponçaae plate P is: either by means of a block 20, this square shape, as shown, capable of sliding in a transverse slide, 30, slightly inclined relative to the general longitudinal axis of the plate P. A lever at those positions, 31, provided with a lug 31a, capable of cooperating with an enco-15 ehe 20a of the block 20 allows the block to be immobilized in the center that the slide 30. Such provision is very substantially that described in US Patent 2 £ 93,175, so that the eccentric 10, actuated by the iTiOteur K transmits to the plate P is a rec-20 reciprocating tilinear movement in the longitudinal direction (when the block 20 is free in the slide 30) or an orbital movement (when the block 20 is immobilized in the slide 30).

The attachment of the plate P to the frame E is generally ensured by four elastic pillars, 50, which allow a certain bending of the plate P relative to the frame B, while tending to always bring them back to an average relative position. Such elastic pillars are found, for example, described in US Patents 2,893,175, 3,371,451, 3,418,761.

The shaft a of the motor K moreover directly drives two fans VI and V2. The fan VI is used in a manner known per se to cool L · 6 the motor K. The fan V2 is used, in a manner also known per se to maintain under vacuum this suction and discharge a circuit d suction 60 passing through the plate P to compensate for the abrasive and abraded dust 5 resulting from the work of the sander and rejecting them in a receptacle provided for this purpose by means of a circuit 65.

Such an arrangement for the suction of these abrasive and abraded dust is in itself classic, 10 being for example described in German patent DT 1 165 445.

As shown, the plate P has a generally rectangular shape. At its lower part, it comprises, in a manner known per se, a mat of elastically deformable material, 70, comprising these orifices in communication with the suction circuit 60. At its front part and at its rear part , the plate P comprises these fastening systems, 60, capable of clamping and retaining the edge of a sheet of abrasive paper, such clamping systems and this retention being well known in themselves, as described for example to U.S. patents 2,817,192 or 3,136,099.

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In all that has been described so far, the sander of FIGS. 1 to 4 only brings together characteristics and functions well known from the prior art in this field, as regards the elastic mounting of the plate. on the frame by elastic pillars, from the transmission of the movement of the motor to the plate by means of an eccentric and a transmission block, this aspiration these abrasive dust and abraded by means of a suction circuit passing through the plate and placed in suction vacuum by a fan secured to the motor, this retaining abrasive paper at the edge of the plate by L clips.

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In all the constructions of vibratory tools known up to now, the vibrating plate is constituted by a rigid planar element, for example by a plate, on which the members 5 necessary for accomplishing these functions mentioned above are brought back . Such a construction is relatively complicated and expensive, in particular due to the assembly of the different parts.

On the other hand, in constructions of the prior art, the plate, often quite thin, risks not having sufficient rigidity, with these risks this veiling.

Finally, in the prior art, the organization of a suction circuit through a plate and a frame movable relative to one another, poses poorly resolved sealing problems.

The present invention provides a new structure of the sanding plate, particularly simple, robust and economical, enabling the above-mentioned functions to be accomplished very efficiently and very economically, for the final production of a more robust, more economical and More reliable.

The structure of the plate according to the invention is essentially characterized in that it is made in the form of an assembly between a base 100, comprising housings or recesses, and a counterplate comprising homologous reliefs, 200.

The base 100 is advantageously made of a rigid plastic, and the plywood 200 of stamped metal and, thus, the assembly is particularly rigid and undeformable.

Figures 5, 6, 7 show the plate produced by assembling the base 100 and the counter

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ε plate 200. FIGS. 6, 9, 10, 1 ′ represent said plywood 200.

Figures 12 and following represent said erlasse 100.

5 To simplify the presentation, we will first of all core the plywood 200, illustrated in FIGS. 8 to 11.

This plywood 200 is made of stamped sheet metal. It has a general planar tangential rec-10 form. On one of its short sides, it has two folded edges 210. At these regular intervals of its periphery, it has fixing openings 215, At its four corners, it comprises these openings 250, cooperating with fixing these elastic pillars 50.

On the other hand, the plywood 200 has at its central part a stamped cut-out opening 230 forming a slide for the block 20. The slide is defined by tabs 230a folded vertically upwards, and by these tabs 230b offset downwards and folded horizontally. Thus, the block can be guided by its lower surface on the tongues 230b and by its lateral edges by its tongues 230a, the contact surface of the block 20 and of the tongues being minimal.

A hole 231 is used for the articulation of the lever 31. A folded cut tongue 232 serves this stop to this lever, while a small hole 233 is used for fixing 30 of the arming spring 31b of the lever 31.

Finally, the plate 200 has an opening 270 capable of accommodating the end of the shaft a, and a rectangular opening 260 serving, as will be seen more fully below, for passing this air i—.

9 of the suction circuit 60.

The base 100, shown in Figures 12 and following, is made of a molded plastic material comprising a. plate at its lower part and 5 reliefs or ribs at its upper part. The base 100 has the same general rectangular shape as the plywood 200; it comprises these elements which are homologous to those of plywood 200. To the edges 210 correspond partitions 110. To the openings this mounting 215 10 of the plate 200 correspond on the base 100 of the rods 115 serving as rivets.

To the slide 230 of the plate 200 corresponds a recess 130 of the base 100. To the openings 250 of the plywood correspond recesses 150 15 in the base 100, To the opening 260 of the air intake of the plywood 200 corresponds to an opening 160 in the base 100. Likewise, to the opening 270 corresponds an opening 170 in the base 200. Finally, parallel to its short sides, the base 100 has flanges 101 20 and 102 defining the those ends of this base a groove 103 and, perpendicular to each groove 103, two flanges 104 and 105 define a longitudinal groove 106.

On the other hand, at its lower part, the base 25 100 is traversed by channels 10E, open downwards and communicating with an opening 160 of the suction circuit 60.

The structure of the plywood 200 and of the base 100 having been briefly defined, it is easier to understand, referring this time to FIGS. 5 to 7, how the two parts are assembled, one on the other. 'other.

! On the base 100, four pillars' • y 10 elastia 50 are placed, provided at their lower part with an overhanging foot or flange 51. The flanges 51 are engaged in the corresponding recesses 150 of the base 100. On the other hand , those clips in elastic metal wire 5, 80, comprising a loop this tightening 81, those strands forming hinge, 82, and a lever this operation, 83, are put in place on each side of the base 100, the loop 81 this each clip 80 cooperating as shown with the corresponding groove 103, and the lever 83 10 cooperating with the corresponding groove 106.

In this position these pillars 50 and these clips 80 the plywood 200 is brought into a cooperative relationship with the base 100, the openings 250 engaging on the pillars 50, the openings 215 then engaging on the rods 115 , and the flanges 210, facing these partition elements 110 for applying the transverse strands 82 of the clips 80 against the base 100. The establishment and descent of the plywood 200 on the base 100 are preferably réa-20 Used in an automatic assembly machine. At the end of movement, the plywood 200 is clamped onto the em-base 100, the rods 115 of which protrude slightly above the orifices 215. It then suffices to deform the end of the rods 115 when hot to assemble the 25 clamping, the rods 115 thus behaving like plastic rivets.

In the assembly position, it is the counter plate 200 which holds the elastic pillars 50 by their edges 51. Similarly, it is the edges 210 of the plywood 200 which serve as a hinge for the clips 80 which have been placed under tension by the assembly, each loop 61 applying with spring effect at the bottom that the corresponding norge 103, while each lever of

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f / 11 operation 83 applies with spring effect in the corresponding groove 106. If the lever 83 is released from a clip 80 out of its groove 106, the clip can be pivoted around its strands £ 2, inside these 5 flanges 210 forming a hinge. When the lever 83 lowers down, the loop 81 lifts.

Such an arrangement constitutes a fixing system for a sheet of this abrasive paper which one would like to fix below the elastic mattress 70 10 glued to the lower part of the base 100, and itself crossed by suction orifices 71 .

So far we see all the advantages of the base- / counterp] aque structure, in this case concerns the assembly. Such a structure easily makes it possible to place and maintain these elastic pillars 50 and clips 300.

On the other hand, the slide 30 which serves, in a manner known in itself, for housing the block, this transmission 20 is produced very easily due to the recess 130 of the base cooperating with the slide 230 of plywood 200. Thanks to such a structure, ”.

the friction of the block is reduced to a minimum, since it relates only to the tongues 230a and 230b which, as shown, are of reduced dimensions compared to the general dimensions of the block 20.

As explained, '· the plywood 200 can carry a lever 31 pivotally mounted on the opening 231 of the plywood. This lever is armed by a spring 31b, in the shape of a U, one of its ends being hooked to the opening 233 of the plywood 200, the other end being hooked to the lever 31. The tongue 232 serves as a stop for the pivoting of the the sink.

Finally, the free end of the tree has

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i 12 tor M comes easily, during this assembly, to find its place in the opening 270 of the plywood 200 and in the corresponding recess 17G that the base 10G.

Once the assembly has been carried out, the counter plate 200 on the base 100, gold. produced the plate P of the sander according to the invention. The elastic pillars 50 have at their upper part aerospheric barges 55 capable of receiving rims R forming part of the frame B of the tool.

10 Thus, the assembly of the plate P and the frame E. is carried out. During this assembly, a transmission block 20 was installed in the slide 30 (231 - 130) and brought into cooperative relationship with the eccentric 10 connected as explained above to the motor K.

It is important to point out that the frame B comprises, for the definition of the suction circuit 60, a vertical tubular element, 61, with rectangular section.

This vertical tubular element is placed in sealed cooperation with the suction and evacuation circuit 65 which is implemented under the effect of the fan V2.

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In the horizontal plane at its lower part, the rim of the tubular element 61 has a re-entrant part 62. A felt seal 63 comes, as shown, to engage on the rim (FIGS. 1, 2 and 4).

In use, when the whole of the plate P moves relative to the frame B, the seal 63, made of compact felt, natural or synthetic, ensures perfect sealing of the circuit 60 by rubbing against the counterplate 200 which is smooth.

Thus, the structure of this plate, defined above, perfectly seals the suction and evacuation circuit of abrasive and abra-sed dust.

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Of course, the invention applies to any vibrating tool seen above type, -eue its motor is e-iectrigue, pneumatic or other and regardless of the vibration regime.

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Claims (9)

14 1. Vibrating tool, of the type comprising a fixed frame (B) incorporating a motor (M), a movable plate (P) connected to the fixed frame by a plurality of elastic pillars (50), transmission means (c) 5 for t; ansform the movement and motor into a rectilinear or orbital reciprocating movement of the plate (?), characterized in that the plate is constituted by the assembly of a lower base (100) and an upper plywood (200), the base and the plywood pre-10 feeling homologous reliefs used for housing and retaining the accessory members (20, 31, 50, 80). 2. Tool according to claim 1, characterized in that the base comprises recesses (150) facing homologous openings (250) of the plywood, and in that the elastic pillars (50) comprise these overhanging feet (51) housed in said recesses, passing through the openings (250) of the plywood, and held in position by clamping their feet (51) between the base (100) and the plywood (200). i -20 3. Tool according to one of claims 1 and 2, characterized in that the base (100) is made of a plastic material and the plywood (200) of stamped metal, the base comprising rods ( 115) forming a rivet, molded therewith and cooperating with homologous openings (215) of the plywood to ensure the assembly of the eriase and the plywood. 4. Tool according to one of claims 1 to 3, characterized in that the base (100) and the plywood (200) have recesses (130, 230) to serve as a slide (30) to block this transmission (20) connected to an eccentric (10) connected by the motor (M). 1 5 5. Tool according to claim 4, characterized in that eue the plywood (200) is used for mounting a spring lever to ensure the locking in position of the transmission block (20). 6. Tool according to claim 4, character ized in that said slide (30) is delimited by these cut and folded tabs (230a, 230b) of the plywood (200) constituting these reduced areas of sliding and this guide for said block of transmission 10 (20). 7. Tool according to one of claims 1 to 6, characterized in that the base (100) comprises housings (103) and the counterplacue these flanges (210) cooperating with them, to serve this hinge to these atta- 15 ches (80) intended to ensure the tightening of the edges of the sheet of abrasive paper associated with the plate (P). 6, Tool according to claim 3, characterized in that each fastener (80) is constituted by an elastic wire comprising a tightening loop (81), those 20 articulation strands (82) and a lever (83) for maneuvering capable to cooperate with a groove (106) of the em-base (100). 9. Tool according to one of claims 1 to 8, characterized in that the plywood (100) has at its lower part these suction channels (10E) opening into a through opening (160), in that the plywood is provided with a homologous opening (260), in that the two openings open into a suction circuit (60) passing through the frame, and in that this frame (B) is associated with a sliding seal (63) bearing against the plywood (200) all around said opening (260). UJJOjj