US2749676A

US2749676A - Vibratory tool

Info

Publication number: US2749676A
Application number: US394334A
Authority: US
Inventors: Anton Nicholas
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-11-25
Filing date: 1953-11-25
Publication date: 1956-06-12
Anticipated expiration: 1973-06-12

Description

June 12, 1956 N. ANTON 2,749,676

VIBRATORY TOOL Filed Nov. 25, 1953 2 Sheets-Sheet l 74 e1 85 FIG. 5

| illllllllllmlllfllllllllm 76 .NVENTO i H: NICHOL 70 62 BY As ANTON ATTORNEYS June 12, 1956 ANTON 2,749,676

VIBRATORY TOOL Filed Nov. 25, 1955 2 Sheets-Sheet 2 52 24 35 34 33 3 20 f3 a 55 i V a F-' IG 9 y /3/@. Had,

INVENTOR. NICHOLAS ANTON I'IIIIIIIA ATTORNEYS VHBRATURY TQOL Nicholas Anton, Park Ridge, ill.

Application November 25, 1953, Serial No. 394,334

ltl Claims. (Cl. 51-170) This invention relates to vibratory tools and more particularly to vibratory tools of the type particularly well adapted for hand sanding and hand polishing op erations.

Vibratory sanders and polishers have heretofore been known in the art. However, such vibratory sanders and polishers which have been heretofore known have had several inherent disadvantages such as, for example: being heavy in weight; being weak in action; being relatively complicated in construction and operation; operating with undesirable vibration; or operating With an undesirable oscillating motion which, especially in sanding operations, did not produce desirable results. It is the primary object of my invention to overcome the aforementioned disadvantages.

It is the principal object of my invention to provide a vibratory tool of the aforementioned type embodying a sanding or polishing block which is supported in the tool in a novel and expeditious manner and which, during the operation of the tool may be operativel-y reciprocated by an alternating electromagnet in a novel and expeditious manner.

A further object is to afford a novel vibratory tool of the aforementioned type wherein the sanding or polishing block reciprocates through a relatively long path of travel in substantially a single plane with a minimum of vibration or oscillation transversely to such plane.

Another object of the invention is to afford a novel vibratory tool of the aforementioned type wherein the throw or movement of the block thereof may be quickly and easily adjusted in a novel and expeditious manner.

Yet another object of my invention is to afford a vibratory tool of the aforementioned type which may be readily manually supported and handled by the operator.

A further object of my invention is to afford a vibratory tool of the aforementioned type which is sturdy in construction, efficient in operation, and which may be economically produced commercially.

Another object is to afford a vibratory tool of the aforementioned type wherein sand paper, a polishing cloth, or the like may be supported on a reciprocal block in a novel and expeditious manner.

A further object is to afford a novel tool of the aforementioned type embodying novel retaining or clamping structure on the reciprocal block thereof.

A further object is to afford a novel tool of the afore-' mentioned type embodying novel retaining or clamping devices for sand paper, polishing cloths, or the like which can be quickly and easily operated and which are positive in retaining operation.

Another object is to construct a vibratory tool of the aforementioned type which embodies novel retaining or clamping structure which is readily actuated and which during actuation is efiective to tension, sand paper, a polishing cloth, or the like, on the block in a novel and expeditious manner.

2,749,576 Patented June 12, 11956 Other and further objects of the present invention will be apparent from the following description and claims and are illustrated in the accompanying drawings which, by way of illustration, show a preferred embodiment of the present invention and the principles thereof and what I now consider to be the best mode in which I have contemplated applying these principles. Other embodiments of the invention embodying the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention.

In the drawings:

Fig. l is a side elevational view of a vibratory tool embodying the principles of my invention;

Fig. 2 is a top plan view of the vibratory tool shown in Fig. I;

Fig. 3 is a view somewhat similar to Fig. l but with the near half of the casing removed and with certain of the parts shown in Fig. 1 being shown in section;

Fig. 3A is a detail sectional view taken substantially along the line 3A-3A in Fig. 3;

Fig. 4 is a sectional view taken substantially along the line 4-4 in Fig. 3;

Fig. 5 is an elevational view of the half of the casing shown in Fig. 3;

Fig. 6 is a detail elevational view of a portion of the tool shown in Fig. 3;

Fig. 7 is a detail sectional view taken substantially along the line 7-7 in Fig. 6;

Fig. 8 is a sectional view taken substantially along the line 8-8 in Fig. 3;

Fig. 9 is a sectional view taken substantially along the line 99 in Fig. 8;

Fig. 10 is a detail sectional view somewhat similar to Fig. 9 with parts thereof disposed in different operating positions;

Fig. 11 is a detail sectional View of the portion of the mechanism shown in Fig. 10 with parts thereof disposed in different operating positions;

Fig. 12 is a detail sectional view similar to Fig. 11 with parts thereof disposed in different operating positions;

Fig. 13 is a detail sectional view similar to Figs. 11 and 12 with parts thereof shown in different operating positions;

Fig. 14 is a perspective view of a portion of the mechanism shown in Figs. 8 to 13, inclusive;

Fig. 15 is a perspective view of the mechanism shown in Fig. 14, with the parts thereof disposed in diiferent operating positions.

To illustrate the principles of my invention, a vibratory sander or polishing tool 20, comprising a preferred embodiment of my invention, is shown in the drawings. The vibratory tool 2% comprises, in general, a casing 22 enclosing an alternating electro-magnet 24, which is operable to reciprocate a shoe or block 26 disposed outwardly of the casing 22 and mounted on two supporting

members

28 and 29 which extend downwardly from the electro-magnet and project outwardly through the open bottom 31, Figs. 3 and 4, of the casing 22.

The electro-magnet 24 comprises, in general, a core 33, a winding 34, and an armature 35. The core 33 is preferably of the E-type and formed of a plurality of laminations 37, Fig. 4, covered by a housing 38, having two side walls 44) and 41, and three

end walls

43, 44 and 45, Figs. 3 and 4. Each of the

side walls

40 and 41 have an ear 4% and 41a, respectively, Figs. 3 and 3A, formed as an integral part thereof and projecting rearwardly from the laminations 37 for a purpose which will be discussed in greater detail presently.

The armature 35 like the core 33 is preferably composed of a plurality of laminations 47, Fig. 3A, on which Q is mounted a housing 49. The housing 49, Figs. 3 and 3A, includes two

side walls

51 and 52 and an end wall 53. A bearing 34 is mounted on and extends through the upper end portion of the armature 35, and the armature 35 is pivotally mounted on the core 33 by means of a pin or bolt 55, which extends through the bearing 34 and the

ears

40a and 41a of the housing 38 and through one end of the armature 35, which is disposed between the

ears

40a and 41a, Fig. 3A. The sleeve 34 is mounted in the armature 35 with a bearing fit and the armature 35 rotates thereon between the cars 40:: and 41a.

The winding 34 is of a conventional type and is preferably mounted on the center bar 33a of the core 33, Figs. 3 and 4, and is connected through a switch 57 to

lead wires

59 and 60.

The block 26, which is reciprocated by the electromagnet 24 during the operation of my novel vibratory tool 20, as will be discussed in greater detail hereinafter, includes a plate 62, having an upper face 63 and a lower face 64, and a pad 66 mounted on the lower face 64. The plate 62 may be made of any suitable material, such as, for example, aluminum and the ends and sides thereof are preferably turned down to form end walls or

end flanges

68 and 69 and side walls or

side flanges

70 and 71 respectively, Figs. 3 and 4. Ribs 74 are preferably formed in the central portion of the plate 62 to thereby stiffen and strengthen the same. The pad 66 may be formed of any suitable material such as felt, rubber, or the like, and is preferably adhesively secured to the lower face 64 and the plate 62 between the flanges 68--71.

In the operation of my novel vibratory tool 20 as will be presently described in greater detail, a sheet of sand paper, or polishing cloth,'or the like, is normally mounted on the lower face of the pad 66, and is'firmly held thereon by

clamping units

75 and 7 6, Figs. 3 and 10, mounted on the upper face of the plate 62, the

clamping units

75 and 76 forming a readily actuated and positively acting device for this purpose, as will be discussed in greater detail hereinafter.

The block 26 is then caused by the armature 24 to rapidly reciprocate in a forward and rearward direction, or, that is, to the right and the left, respectively, as viewed in Fig. l, to thereby impart a series of rapid reciprocating polishingor sanding strokes to the block 26.

The supporting member 28 includes a leaf spring 78 and the armature 35, Fig. 3, the lower end of the leaf spring 78 being secured to the plate 62 by suitable means such as rivets 79, and the upper end of the leaf spring 68 being secured to the end wall 53 of the housing 52 on the armature 35 by suitable means such as rivets 81.

The supporting member 29 comprises a double-leaf spring 82; the spring 82 comprises two spring leaves 82a and 32b which are disposed in substantially upright position, Fig. 3. The leaf 82b is considerably shorter in length than the leaf 82a, Fig. 3, and is mounted on the upper end portion of the latter, being secured thereto by suitable means such as rivets 87.

The lower end portion of the spring 82 is connected to the plate 62 of the block 26 by suitable means such as rivets 35, Fig. 3, and the upper end portion thereof is mounted on the end wall 45 of the core housing 38 of the transformer 24 by the two

clamps

91 and 91a, Figs. 3, 6 and 7, which are identical in construction. The spring 82 is adjustably mounted on the end wall 45 of the armature 24 by the

clamps

91 and 91a, as will be discussed in greater detail presently.

Each of the

clamps

91 and 91a includes a rear backing plate 93, Fig. '7, and a front plate 94, and is mounted on the upper end portion of the leaf spring 82 with the latter disposed between the

plates

93 and 94. A slot 96 is formed in the upper end portion of the two

leaves

82a and 82b of the spring 32, Figs. 6 and 7, and a similar 4 slot 97 is formed in the upper end portion of the end wall 45 of the housing 38. The leaf spring 82 when disposed in operative position, is mounted on the end Wall 45 in such position that the

slots

96 and 97 are disposed in alignment with each other.

Each of the

clamps

91 and 91a includes a bolt 99 which, as best seen in Figs. 3, 6 and 7, extends through the slot 97 in the end wall 45, the backing plate 93, the slot 96 formed in the leaf spring 82, and the plate 94. A nut 101 is mounted on the bolt 99 and may be adjusted thereon to effectively clamp the end wall 45, clamping

plates

93 and 94, and the leaf spring 32 together to thereby secure the leaf spring 82 in operative position on the end Wall 45 of the core 33. It will be seen that with the slotted construction of the end wall 45 and the leaf spring 82, the vertical position of the leaf spring 82 on the side wall 45 may be readily adjusted by loosening the nuts 101, moving the leaf spring 82 upwardly or downwardly into the desired position on the Wall 45 and then tightening the nuts 101.

The casing 22 which I prefer to use on my novel vibratory tool 20 may be made of any suitable material such as, for example, a phenolic thermo-setting resin and is preferably split along the longitudinal center line thereof to afford two

halves

22a and 22b which may be releasably secured together by suitable means such as three

bolts

103, 104 and 105, Figs. 1 and 2. Each of the

halves

22a and 22b of the casing 22 of my novel vibratory tool 20 shown in the drawings is identical in construction, being merely reverse or mirror images of each other to afford opposite sides for casing 22. Thus, it will be seen that, as shown in the half 22b of the casing 22 shown in Fig. 5, each of the

halves

22a and 22b of the casing 22 is substantially cup shaped, having a top flange 107, a rear flange 100, and a front flange 109, each of which flanges is disposed in abutting relation to a corresponding flange on the other half of the casing when the two

halves

22a and 22b are disposed in the operative relation to each other shown in Figs. 1, 3 and 4. Each of the

halves

22a and 22b of the casing 22 embodies a plurality of ventilating slots 112 formed in the side wall 113 thereof; a supporting ridge or shelf 115 formed on the lower inner face of the side wall 113; a pair of abutment members 117 and 118 formed on the upper end portion of the inner face of the side wall 113 and projecting downwardly from the top flange 107; a plurality of reinforcing or strengthening ribs 119 formed on the upper end portion of the inner face of the side wall 113; a recess 121 formed in the rear flange 108 and extending therethrough; and an inwardly opening recess 123 formed in the front flange 109, with another recess 124 of reduced cross section extending outwardly through the remainder of front flange 109 from the recess 123.

The core 33 and the armature 35' of the electro-magnet 24 are of such size that they may be disposed in assembled relation to each other and placed in one of the halves of the casing 22 such as, for example, the half 22b of the casing 22 as shown in Fig. 3, within the confines of the

flanges

107, 103 and 109 thereof, and when so disposed the lower wall 44 of the housing 33 of the core 33 rests on the shelf 115, and the end wall 43 of the housing 38 is disposed in abutting relation to the abutment members 117 and 118, and the side wall 49 of the housing 38 rests against the reinforcing ribs 119 to thereby support the core 33 in spaced relation to the major portion of side wall 113 of the half 22b of the casing 22. Also, when the transformer 24 is so disposed in the half 22b of the housing 22, the lead-in

wires

59 and 60 may be mounted in the recess 121, and the switch 57 may be mounted in the recess 123, with the control button 57:: thereof projecting outwardly through the recess 124. a

With the electro-magnet 24, switch 57, and the

lead I wires

59 and 60 disposed in this manner in the half 22b be mounted on the half 22b in operative position as shown in Figs. 1, 2 and 4, whereby it is similarly engaged with the transformer 24, the wires 59 and 6t) and the switch 57. The bolts 163, 194 and 1615 may then be inserted through the

halves

22a and 22b of the casing 22, and the nuts 163a, 164a and 1(l5a thereon, respectively, may be tightened to thereby firmly clamp the

halves

22a and 22b of the casing 22 together. With this construction it will be seen that the novel vibratory tool 20 shown in the accompanying drawings may be readily constructed and quickly and easily assembled, and when assembled the electro-magnet 24 and the other parts are firmly secured in operative position in a novel and a practical manner.

As is best seen in Fig. 3, the supporting

members

28 and 29 are secured to the electro-magnet 24 and the block 26 in such a manner that the block 26 is supported by the electro-magnet 24, and the electro-magnet 24, the block 26, and the supporting

members

28 and 29 form a unitary structure which may be readily inserted into or removed from the casing 22 as a unit.

It will be noted that the armature 35 is pivotally mounted at its upper end to the extensions 4% and 41a of the core housing 33 of the transformer 24 by a fixed pivot 55. Also, it will be seen that the lower end portion of the leaf spring 78 is formed into a rearwardly opening substantially arcuate-shaped bend 126, and the lower end portion of the leaf 82a of the spring 82 is likewise formed into a rearwardly opening substantially arcuateshaped bend 127. Immediately above the bend 127, the leaf 52a of the spring 52 is formed into a forwardly opening substantially arcuate-shaped bend 123 that terminates at its upper limits in downwardly spaced relation to the leaf 82b, Fig. 3. According to my theory of the operation of my device these structural features and the combining thereof in the novel and expeditious manner embodied in my invention play an important part in the realization of the improvements afforded by my novel vibratory tool. 1 have found that with my novel vibratory tool 26 constructed substantially in accordance with the disclosure made herein, the block 26 during operation of the tool 20 reciprocates along a path of travel closely simulating a straight plane and with a minimum of objectionable vertical or lateral transverse movement.

The armature 35, when disposed in oil position, is normally disposed at the position shown in Fig. 3 wherein it is disposed in a downwardly opening rearwardly extending angle to the core 33. During operation of my novel vibratory tool 23 the armature 35 is alternately pivoted about the fixed pivot .55 in a counterclockwise direction as viewed in Fig. 3 from the position shown in Fig. 3 toward the core 33, and in a clockwise direction from a position closely adjacent the core 33 back toward the position shown in Fig. 3. Such movement of the armature 35 is effective, through its connection by the spring 78 to the block 26, to alternatively move the block 26 forwardly and rearwardiy or, that is, the right and left as viewed in Fig. 3.

The

springs

78 and 52 are efiective to prevent the armature 35 from striking the core 33 of the transformer 24 during oscillation of the armature 35 in the operation of the tool 2-0. Adjustment of the throw of the armature 35 and of the throw of the block 26 may be readily effected by adjusting the spring 82 in the

brackets

91 and 91a to thereby adjust the effective len th of the spring 82. This may be normally accomplished by adjusting the spring 8-2 into the position in the

brackets

91 and 91a wherein the unit is tuned to produce maximum throw of the block 2-6 and maximum power, and then moving the bracket 31a to a position wherein, with the tool turned oft, the force necessary to manually hold the block in forwardly displaced position equivalent to the aforementioned maximum throw of the block is between fifteen and twenty per cent less than was necessary to so hold the block when the spring 82 was disposed in the tuned position. With the vibratory tool 20 adjusted in this manner it is assured that in normal operation, the armature 35 will not strike the core 33, and that with the halves 20a and 22b of the housing 22 tightly clamped in operative position over the transformer 24, the throw of the block 26 will remain in its most efiective range for efficient operation.

As was previously mentioned, the shoe or block 26 embodies as a part thereof

novel clamping units

75 and 76 which are effective to securely and positively hold wiping sheets such as sand paper, polishing cloths, or the like, in operative position on the lower face of the pad 66 and are, in addition, effective to automatically tension the sand paper or cloth on the pad 66 during the actuation of the clamping devices into clamping position.

As is best seen in Figs. 8 to 15, the clamping

units

75 and 76 each embody a clamping plate 131 and a leaf spring 13.3. The leaf spring 133 is substantially of a modified W-shape, Figs. ll, 12 and 13, embody a long outer leg 135, a short outer leg 1.36, and two

intermediate legs

137 and 138. The short leg 136 has a free end portion 14%, and is connected at its opposite end to the end of the leg 13% to form a junction 142 therewith, and the end of the leg 1.38 opposite the junction 14-2 is connected to the leg 137 to form a junction 143 with the latte The leg 135, like the leg 136, has a free end portion 1' and the end of the leg opposite the free end portion M4 is connected to the end of the leg 137 opposite the junction 143 to form a junction 145.

The clamping plate 131 may be formed of any suitable material, such as, aluminum, and includes an elongated leg 151, having one free longitudinal edge 153. An elongated fiange is mounted on the longitudinal edge of the leg 151 opposite the free edge 153 to form a junction 154 therewith along substantially the full length of the leg 151. The flange 155 forms an integral lateral extension of the leg 151 which is disposed at an inwardly and upwardly opening obtuse angle to the plane of the leg when the leg 151 is disposed in normal clamped position, Figs. 10 and 13.

Two ears 157 and 158 project from the ends of the leg 151 in a substantially perpendicular relation thereto and in substantially parallel relation to each other. Two

ears

163 and 164 project from opposite ends of the flange 155 in substantially longitudinal alignment therewith and afford handles for actuating the clamping units 75 and in as will be discussed presently.

An elongated slot 161 is formed in the longitudinal central portion of the leg 151 in a substantially parallel relation to the free edge 153 thereof, and is disposed adjacent to the junction 154 with the flange 155.

The inner end portion of the leaf spring 133, adjacent the free end 144 of the leg 135 is secured in juxtaposition to the upper face of the plate '62 of the block 26 by suitable means such as the rivets 79, Figs. 3, 9 and 12. The other end portion of the leaf spring 133 extends outwardly through the slot 161 and is so disposed therein that when the clamping plate 131 is disposed in normal operating positions the leg 151 thereof is disposed between the

legs

137 and 133 of the spring 133, and the junction 143 is disposed in engagement with, or closely adjacent to the lower edge of the slot 161. In the operation of the clamping device 75, and for a purpose which will be discussed in greater detail presently, the clamping plate 131 may be rotated around the ears 157 and 158 between a fully open position shown in Fig. 11, and a fully closed clamping position shown in Fig. 13, the plate 131, in moving between these two positions passing through an intermediate of temporary holding position shown in Fig. 12.

In the fully open position, shown in Fig. 11, the clamping plate 131 is supported on the ears 157 and 158 which rest on the top face 63 of the plate 62, and the leg 15.1 is disposed in rearwardly projecting, upwardly spaced, substantially parallel relation to the plate 62. In this position, the free edge of the flange 155, opposite the 7 junction 154 rests on the upper face 63 of the plate 62, and the leg 133 of the spring 133 is disposed in downwardly urging engagement with the leg 151 of the plate 131 adjacent to the free edge 153 thereof. To retain the clamping plate 131 in this position, the operator may manually apply downward pressure on the flange 155 or the

ears

163 and 164 thereof.

In the intermediate or temporary holding position, Fig. 12, the clamping plate 131 is disposed in such position that both the free edge 153 of the leg 151 and an edge portion of the ears 157 and 158 are disposed in engagement with the upper face 63 of the plate 62 with the leg 151 of the clamping plate 131 projecting outwardly or rearwardly from the flange 155 and being disposed at a forwardly opening acute angle to the plate 62. With the plate 131 disposed in this position, the leg 138 of the spring 133 is disposed in juxtaposition to the outwardly disposed face of the leg 151 and the junction 143 is disposed in engagement with the lower edge of the slot 161, whereby the spring 133 is effective to urge the clamping plate 131 to pivot in a counterclockwise direction around the ears 157 and 158 and thereby urge the free edge 153 of the leg downwardly toward engagement with the plate 62.

In the fully closed or clamping position shown in Fig. 13, the clamping plate 131 is disposed in such position that only the free edge 135 thereof is engaged with the plate 62, the flange 155 and the ears 157 and 158 projecting upwardly from th leg 151, and the leg 151 being disposed in a rearwardly or outwardly opening acute angle to the plate 62. When the plate 131 is disposed in this position the spring 133 is engaged with the plate 131 at three places of contact and is effective to firmly but yieldingly latch the plate 131 in this position. Thus, it will be seen that the junction 145 is disposed in engagement with the inwardly disposed face of the leg 151, the leg 138 rests on the lower edge of the slot 161, and the free edge portion 141) of the leg 136 is disposed in engagement with the rearwardly or outwardly disposed face of the flange 155.

It will be seen that when the plate 131 is disposed in this position the leg 151 has moved inwardly past the center of rotation of the plate so that the spring is effective to firmly hold the plate 131 in this position and, in effect, urges the plate 131 substantially along the plane of the leg 151 into clamping engagement with the face 63 of the plate 62. To move the plate 131 from the clamping position shown in Fig. 13 to the intermediate position shown in Fig. 12 the operator may exert forwardly or inwardly directed manual pressure on the flange 155 or the

ears

163 or 164 thereof to rotate the plate 131 in a clockwise direction, as viewed in Fig. 13, against the latching action of the spring 131.

' The clamping unit 76 is of identically the same construction as the clamping unit 75 and, in fact, the parts of the clamping

units

75 and 76 are interchangeable. Therefore, the parts of the clamping unit 76 are identified in the drawings by the same reference numerals as the parts of the clamping unit '75 but With the suffix a added thereto.

In the operation of my novel vibratory tool, when it is desired to place a wiping sheet such as a sheet of sand paper or a polishing cloth in operable position on the lower face of the block 26, this may be quickly and easily accomplished. First, the clamping plate 131 of the clamping unit 75 may be manually moved by the operator into the fully open position shown in Fig. 11 and the one end portion of the wiping sheet S may be inserted inwardly under the leg 151 in a forward direction and parallel to the upper face 63 of the plate 62 until that end of the sheet S is disposed in abutting relation to the ears 157 and 158. The operator may then release the clamping plate 131 of the clamping unit 75 and permit the same to be rotated by the spring 133 into the temporary holding position shown in Fig. 12 wherein the free edge 153 of the leg 151 is firmly held in position to clamp the rear end portion of the sheet S against the plate 62. The sheet S may then be extended across the lower face of the block 26 and, with the clamping pate 131a of the clamping unit 76 held in fully opened position by the operator, the front end portion of the sheet S may be similarly fed into a position wherein it is disposed in engagement with the ears 156a and 158a of the clamping unit 76. The operator may then permit the clamp plate 131a to be rotated into its temporary holding position by the spring 133a to thereby firmly clamp the front end portion of the sheet S against the upper face 63 of the plate 62.

Normally, when the sheet S is being held by the units and 76, with the latter disposed in their temporary holding positions, the sheet S is not tightly tensioned across the lower face of the block 26, but is somewhat loose as illustrated in Fig. 9. This is normally true because it is somewhat diflicult to pull the sheet S tight with one hand while operating a clamping or holding device with the other hand. This is one of the difficulties encountered with many of the clamping devices heretofore known in the art because with such earlier devices it was diflicult to ever get a sheet of sand paper or a polishing cloth sufficiently tight on a supporting member to afford the desired wiping surface. However, it is immaterial in the operation of my device that when the sheet S is disposed in this temporary holding position it may be somewhat slack on the block 26 because in moving the clamping

units

75 and 76 from the temporary holding positions thereof into the aforementioned fully close clamping position thereof, the clamping

units

75 and 76 are effective to automatically tension the wiping sheet S on the block 26. To do this, the operator merely needs to rotate both clamping

units

75 and 76 from their temporary holding positions into their fully closed or clamping positions. During such movements of the clamping

plates

131 and 131a, the free edges 153 and 153a, respectively, thereof are moved inwardly from the outer ends of the block 26 and, during such movement are firmly held by the spring 133 in engagement with the respective rear and front ends of the sheet S and thus are effective to move these rear and front end portions of the sheet S inwardly toward each other along the upper face 63 of the plate 62, thereby taking up the slack in the sheet S and tensioning the sheet S on the block 26.

It will be seen that in releasing a sheet S from clamped position on the block 26, first one of the clamping

units

75 or 76, and then the other, need merely be moved by the operator from fully closed position into fully opened position and the corresponding end of the sheet S manually removed from beneath the clamping plate 131.

From the foregoing it will be seen that I have afforded a novel vibratory tool of novel construction and of improved operation.

Also it will be seen that I have afforded a novel vibratory tool wherein a polishing or sanding member is supported and actuated in a novel and expeditious manner.

In addition it will be seen that I have afforded a novel vibratory tool wherein such polishing members or sanding members may be quickly and easily mounted in, and removed from, operative position therein and are held in such position by novel clamping units.

Thus, while I have illustrated and described the preferred embodiments of my invention, it is to be understood that these are capable of variation and modification.

I claim:

1. A vibratory tool comprising elongated plate means, an alternating electro-magnet including a core, and an armature pivotally mounted on said core for swinging movement toward and away from said core upon operation of said electro-rnagnet, and spring means supporting said plate means from said electro-magnet for movement by said armature upon said operation of said electromagnet, said spring means comprising two elongated leaf springs disposed transversely to the length of said plate means, each of said leaf springs having one end portion mounted on said plate means, one of said leaf springs having its other end portion mounted on said armature for movement therewith, and the other of said leaf springs having its other end portion mounted on said core, said other leaf spring having a double arcuate bend between said plate means and said core.

2. A vibratory tool comprising elongated plate means, an alternating electro-magnet including a core, and an armature pivotally mounted on said core for swinging movement toward and away from said core upon operation of said electro-magnet, and spring means supporting said plate means from said core for movement by said armature upon said operation of said electro-magnet, said spring means comprising two elongated leaf springs, one of said leaf springs having one end portion mounted on said armature, and having another end portion mounted on said plate means in supporting relation thereto, the other of said leaf springs having one end portion mounted on said core, and having another end portion mounted on said plate means in supporting relation thereto, each of said leaf springs having a substantially arcuate-shaped bend therein between said end portions of the respective spring, said bends opening in the same general direction, and one of said springs having a second substantially arcuate-shaped bend between said end portions thereof, said second bend opening in the opposite general direction from the first mentioned bend in said last mentioned spring.

3. An electrically operated sander comprising an alternating electro-magnet including a core, an armature exposed to the field of said electro-magnet, said armature being pivotally mounted on a fixed pivot on said core for rotation around said pivot toward and away from said core upon operation of said electro-magnet, a sanding block, and means for mounting said sanding block on said armature and said core for movement by said armature upon said rotation of the latter, said means comprising two leaf springs, one of said leaf springs being mounted on said block and said armature, and the other of said leaf springs being mounted on said block and said core.

4. An electrically operated sander comprising an alternating electro-magnet including a core, an armature exposed to the field of said electro-magnet, said armature being pivotally mounted on a fixed pivot on said core for rotation around said pivot toward and away from said core upon operation of said electro-magnet, a sanding block and means for mounting said sanding block on said armature and said core for movement by said armature upon said rotation of the latter, said means comprising two leaf springs, one of said leaf springs being mounted on said block and said armature, and the other of said leaf springs being mounted on said block and said core, each of said leaf springs having a substantially arcuate-shaped bend disposed between said block and said electro-magnet, said bends opening in the same general direction.

5. An electrically operated tool for sanding, polishing, or the like, and comprising an alternating electromagnet including a core, an armature exposed to the field of said electro-magnet, said armature being pivotally mounted on a fixed pivot on said core for rotation around said pivot toward and away from said core upon operation of said electro-magnet, a shoe, and means for mounting said shoe on said armature and said core for movement by said armature upon said rotation of the latter, said means comprising two leaf springs, one of said leaf springs being mounted on said shoe and said armature, and the other of said leaf springs being mounted on said shoe and said core, each of said leaf springs having a substantially arcuate-shaped bend disposed between said shoe and said electromagnet, said bends opening in the same general direction and each being formed transversely to the wide faces of the respective spring in which it is formed, and said other of said springs having a second bend formed therein between said first mentioned bend therein and said core, said second bend opening in the opposite general direction from said first mentioned bends.

6. An electrically operated sander comprising an alternating electro-magnet including a core, an armature exposed to the field of said electro-magnet, said armature being pivotally mounted on a fixed pivot on said core for rotation around said pivot toward and away from said core upon operation of said electromagnet, a sanding block, and means for mounting said sanding block on said armature and said core for movement by said armature upon said rotation of the latter, said means comprising two leaf springs, one of said leaf springs being mounted on said block and said armature, and the other of said leaf springs being mounted on said block and said core, said other spring having a double bend disposed between said block and said core with the bends thereof opening in opposite directions and each being transverse to the wide faces of said other spring.

7. A vibratory tool comprising a casing, alternating electromagnetic means including a core mounted in said casing, an armature exposed to the field of said electromagnetic means, said armature being pivotally mounted in said casing on a fixed pivot for rotation around said pivot upon operation of said electro-magnetic means, a supporting member, and means for mounting said supporting member for movement by said armature relative to said casing upon said rotation of said armature, said last named means comprising two elongated leaf springs, one of said leaf springs being mounted on said supporting member and said armature, and the other of said springs having one end portion mounted on said supporting member, and another end portion mounted in said casing in fixed position relative to said electro-magnetic means.

8. A vibratory tool comprising alternating electromagnetic means including a core, an armature exposed to the field of said electro-magnetic means, said armature being pivotally mounted by a fixed pivot on said core for rotation around said pivot toward and away from said core upon operation of said electro-magnetic means, a casing enclosing said electro-magnetic means and said armature, said casing being disposed in clamping engagement with said core to thereby support said core and said armature in operative position in said casing, an elongated supporting member disposed outwardly of said casing in substantially parallel relation thereto in operative position to support a wiping member, and means disposed in operative position between said casing and said supporting member for mounting said supporting member in said operative position of said supporting member for reciprocation by said armature relative to said casing upon said rotation of said armature, said last named means comprising two elongated leaf springs, one of said leaf springs having one end mounted on said armature, and another end mounted on said supporting member, the other of said leaf springs having one end portion mounted on said core, and another end portion mounted on said supporting member, said core, armature, supporting means, and mounting means, being movable as a unit into and out of said respective operative positions.

9. A vibratory tool comprising alternating electromagnetic means including a core, an armature exposed to the field of said electro-magnetic means, fixed pivot means mounted on said core, said armature being pivotally mounted on said fixed pivot means for rotation there around toward and away from said core during operation of said electro-magnetic means, an elongated casing enclosing said electro-magnetic means and said armature, said casing having two longitudinally extending separable portions, said portions being normally disposed in clamping relation to said core for supporting said core and said armature, an elongated supporting member disposed outwardly of said casing in substantially parallel relation thereto, and means for mounting said supporting member for longitudinal reciprocatory movement by said armature upon said rotation of said armature, said last named means comprising two leaf springs, 'one of said leaf springs having one end portion mounted on said armature and another end portion mounted on said supporting member, the other of said leaf springs having one end portion adjustably mounted on said core for longitudinal movement therealong, and another end portion mounted on said supporting member, each of said leaf springs having a substantially arcuate-shaped bend therein between said end portions thereof, said bends opening in the same general direction, and said other leaf spring having another substantially arcuate-shaped bend disposed between said first mentioned bend therein and said one end portion thereof, said other bend opening in substantially the opposite direction from said first mentioned bends.

10. A vibratory tool comprising alternating electromagnetic means including a substantially E-shaped core, two ears projecting rearwardly from said core in position to form two substantially parallel longitudinal extensions of one leg of said core, an elongated armature exposed to the field of said electro-magnet, a fixed pivot mounted in said ears and extending through one end portion of said armature, said armature being pivotally mounted on said pivot for rotation therearound toward and away from said core during operation of said electromagnetic means, an elongated supporting member, means supporting said supporting member from said armature and said core for longitudinal movement by said armature upon said rotation of said armature, said last named means comprising two leaf springs, one of said leaf springs having one end portion mounted on said armature, and another end portion mounted on said supporting member, and the other of said leaf springs having one end portion mounted on said core, and another end portion mounted on said supporting member in spaced relation to said one leaf spring, each of said leaf springs having a substantialiy arcuate-shaped bend, said bends opening in the same general rearward direction, and said other leaf spring having another substantially arcuate-shaped bend disposed on the opposite side of said first-mentioned bend therein from said supporting member, said other bend opening in the general opposite direction from said first mentioned bends, and a casing enclosing said core and said armature, said casing having inwardly projecting portions supportingly engaging said core in spaced relation to said armature.

References Cited in the file of this patent UNITED STATES PATENTS 2,280,446 Nyman Apr. 21, 1942 2,324,292 Dremel July 13, 1943 2,509,561 Dremel May 30, 1950 2,546,087 Burleigh Mar. 20, 1951 2,585,637 Dremel Feb. 12, 1952 2,634,559 Carmichael Apr. 14, 1953