US 2846761 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
C. H. EVANS REPAIR TABLES Aug. 12, 1958 Filed March 16, 1953 2 Sheets-Sheet 1 INVENTOR.
02.45547522773- wz Rm Aug. 12, 1958 c. H. EVANS REPAIR TABLES 2 Sheets-Sheet 2 IN V EN TOR. 5. FZMEEiEl/EZZF BY 0 6.7 L
Filed March 16, 1953 United States Patent REPAIR TABLES Charles Howard Evans, Lake Worth, Fla.
Application March 16, 1953, Serial No. 342,524
2 Claims. (Cl. 29-288) This invention relates to repair tables, and more specifically is related to repair tables having an open ally mounted thereon and adjustable work support members associated with the frame.
Another object of this invention is to provide on an open frame mounted to rotate about a horizontal axis, releasable transverse mounting bars positionable in any angle of the plane of the frame and adjustable clamp means on said bars.
Another object of this invention is to provide a device of the class described with quick acting lock means for the rotatable frame.
Another object of this invention is to provide a repair table which can easily be rotated and locked in position for view and repairing any part of a device positioned thereon.
Another object of this invention is to provide a device of the class described with adjustable work holding clamps which clamp the work piece and the adjustable means with a single action.
A further object of this invention is to provide a device of the class described which is simple and economical in construction and efiicient and durable in use.
The foregoing and other objects and advantages will be more apparent from reading the following specification in conjunction with the drawings, forming a part thereof, wherein:
Fig. 1 is plan view of the repair table of this invention, with a television chassis outline in dots as positioned thereon;
Fig. 2 is a front elevation view of a portion of the device of this invention as represented in Fig. 1;
Fig. 3 is an end elevation view of the device of this invention, as represented in Fig. l;
Fig. 4 is a sectional view taken along line 44 of Fig. 1, parts shown in elevation for clarity;
Fig. 5 is a sectional view taken along line 55 of Fig. 1, parts shown in elevation for clarity;
Fig. 6 is a perspective view of a section of the adjustable work mounting arm and holding clamp of the device;
Fig. 7 is a sectional view taken along line 7-7 of Fig. 1, parts shown in elevation for clarity; and
Fig. 8 is a perspective view of the face of the cam actuator for the locking and releasing clutch for the rotatable frame.
Referring to the drawings, wherein like members are given the same reference numeral, a rectangular frame 1, formed of any suitable rigid material such as steel, aluminum, and having a rectangular cross-section, pref- "ice erably square conduit, is pivotally mounted to a pair of standards 2, preferably along the longitudinal axis of the frame 1, for balance considerations. The standard 2 is preferably a circular conduit telescoping in a circular base 3 provided with flat extensions or feet 4 adapted to lie along the floor and support the base 3. Triangular braces 5 are preferably welded to the base 3 and feet 4.
The standards 2 are provided with a series of parallel apertures 6 extending therethrough and aligning with apertures 7 provided through the base 3, whereby the standards may be vertically adjusted in height by a removable pin 8 extending through aligned apertures 6 and 7 in each telescoping standard 2 and base 3.
The frame 1 is pivotally mounted between the standards 2. Means are provided for rapidly locking and releasing the frame 1 against rotation at one pivot point, and preferably at both pivot points, although one pivot point can be any of the conventional pivots, such as bolt. It is preferred, however, that both pivots be lock and release clutches; and, accordingly, this clutch arrangement will be described for one pivot, it being obvious that it can be used on both standards.
The clutch mechanism comprises three parallel discs 11, 12 and 13. One disc 11 is secured to the standard 2 in any suitable manner, such as welding, another disc 13 is secured to the frame 1 preferably by welding, and the third disc 12 is a free floating disc positioned between the other two discs 11 and 13. The two discs 11 and 12 are provided with apertures 16 to receive a bolt 17 freely rotatable therein. The bolt 17, however, is secured to the other disc 13 which is secured to the frame 1, and thus the frame 1 and bolt 17 rotate as a unit. This fastening of the bolt 17 and frame 1 through the disc 13 may be done in any convenient manner, such as welding; but it is desirable to make the device easily assembled and demounted and parts easily replaceable. Accordingly, the preferred method of making this fastening is to provide a shoulder 18 on the bolt against which the disc 13 abuts. The bolt 17 is then provided with a reduced threaded section 19 adjacent the shoulder 18. This threaded section 19 threadedly engages a tapped aperture 20 in the disc 13 until the shoulder 18 abuts the disc. A nut 21 threadedly engages the threaded bolt section 19 clamping the disc 13 against rotation on the bolt threads 19.
The standard 2 has an aperture 23 therethrough to receive the bolt 17 in free rotational relationship. Positioned on the bolt 17 is a cam element 25 freely rotatable on the bolt 17. This cam element 25 has a transverse arcuate recess 26 across the face thereof adjacent standard 2, and a shallow seating recess 27 intersecting said other and deeper recess 26 and perpendicular thereto. The cam element 25 is provided with a handle 28 for actuating the cam one-quarter turn to engage and release the clutch lock provided by the three discs 11, 12 and 13, and explained more fully hereinafter. To positively position the free floating cam element 25 at desired location longitudinally of the bolt 17, the extending end section of the bolt is provided with a threaded section 29 which engages a pair of nuts 30 which limits the outward movement of the cam element 25.
When the handle 28 is turned so that the shallow recess 27 seats against the standard 2, as illustrated in Fig. 4, the bolt 17 is forced outward drawing the discs 11, 12 and 13 into frictional engagement, the center disc 12 being of friction material and surface. This clutch mechanism thus locks the frame 1 with the standard 2 preventing rotation of the frame. When the handle 28 is turned a quarter revolution, the deeper recess 26 is seated against the standard 2 disengaging the discs 11, 12 and 13, with the center disc 12 then being free floating, and
3 permitting free rotation between the frame 1 and standard 2.
A plurality of work mounting bars 32 are transversely positioned on the frame. These mouuting'bars are rectangular in cross-sectiomand preferably square conduit, of any suitable rigid material, such as steel, aluminum and the like. Theends of, these mounting'bars havesections removed from opposed sides to provide parallel-topand bottom extensions ,or projections 33 between which the rectangular frame 1 is positioned. The projections 33 are sufliciently long with respect to the rest of the bar 32 to permit the bar 32 to be positionedfat any angle in the plane of the frame 1, as illustrated in Fig. l. Longitudinal slots 34 are provided in the opposed sides of the bar 32 and terminate at the ends thereof to permit adequate flexing of the top and bottom extensions 33 to clamp the frame 1 therebetween. Clamp means are illustrated as aligned apertures 35 in the bar 32 adjacent the projections 33 having a nut 36 welded to the bar 32 in alignment with one of said apertures 35 and threadedly engaging a thumb bolt 37 having a shoulder 38 thereon abutting the bar; thus with threaded engagement of the bolt 37 and nut 36 with the shoulder 38 abutting the bar 32, the projections 33 are drawn together forming clamp jaws against the frame.
A plurality of slits 139 are provided in the top and bottom of mounting arms or bars 32 to receive normal mounting bolts when employed inmounting a device chassis to its cabinet. These slots 39 in the top member of the arm 32 align with slots 39 in the bottom of the arm.
Hold-down clamp means are slidably mounted on the mounting bars 32. This clamp means comprises a rectangular frame 42 slidably mounted on the mounting bar 32. A projection 43 is formed on one side of the clamp frame 42 and has a horizontal slot 44 extending there through. A vertical aperture 45 is provided through projection 43 and receives a bolt 46 free therein. The bolt 46 has the uppermost end flanged outwardly to provide a projection 47 functioning as a hold-down clamp jaw adapted to fit on the chassis of a television set or other device. The other end of the bolt 46 has a threaded section 49 which engages a nut 50.
With the projection 47 abutting or over-lapping the chassis of a device and the nut 50 threadedly engaging the bolt section 49 until the nut abuts the clamp frame projection 43, the chassis is clamped to the mounting arm 32 and the clamp frame 42 is clamped to the mounting arm 32 preventing movement therebetween.
In operation the device is quite rapid and simple. With the cam element 25 in clamp position, as shown in Fig. 4, and the frame 1 horizontally level, the thumb bolts 37 are released and the bars 32 positioned to receive a chassis thereon. The bolts 37 arethen tightened to fasten the bars 32 to the frame 1 by compressing the projections 33' to clamp the frame 1. The hold-down clamps are then slidably positioned on the bars 32 adjacent the chassis (shown in dotted lines in Figs. 1, 2 and 3), and theprojection 47 of the hold-down bolt 46 positioned over the chassis. The nut50 engaging the threaded section 49 of the bolt 46 clamps the chassis between the projection 47 and the mounting bars 32 and clamp frame 42, additional engagement of the nut 50 and section 49' clamps the frame 42 to the bar 32 by the nut 50 abutting the bottom of the projection 43 and the clamped chassis abutting the frame 42 transmitted to the top of the projection 43, compressing the slot 44, and thereby clamp- 4. 1 ing the frame 42 to the bar 32. With a plurality of these hold-down clamps holding the chassis, as shown in Fig. l, the cam is pivoted one-quarter turn, the discs 11, 12, and 13, release permitting the frame 1 to be rotated to desired position, where it is locked by turning the cam 25 one-quarter turn. by the reverse threaded engagement of the various respective threaded parts.
The invention has been described in detail, but it is to be understood that the invention is not so limited; many changes can be made therein without departing from the spirit and scope of the invention as defined in the appended claims, for example, the friction disc 12 may be secured to one of the adjacent discs 11 and 13 rather than be free floating on both sides.
1. A tiltable work holder comprising spaced tubular standards, a rectangular work support frame comprising opposed side members and opposed end members pivot ally mounted between said standards, said fram'ebeing pivotally mounted by'means comprising a pivot bolt'fixed at its inner end to said frame and extending outwardly through one standard,a quick-acting clamp for releasably clamping said frame to said standard in selected rotated position, said clamp comprising coacting first, second and third clutch discs through which said pivot bolt extends, said first disc being fixed to the'outer side of one of said end members, said second disc being fixed to the inner side of said standard, and said third disc being rotatably mounted on said pivot bolt between said first and second discs, a cam sleeve rotatably mounted on said pivot'bolt outwardly of said standard, means to rotate said sleeve, a raised cam surface on the inner end of said sleeve for engaging the outermost surface of said tubular standard to tension said pivot bolt and draw said clutch discs tog'ether, thereby clamping said 'frame to said standard, and a depressed surface on the inner end of said cam sleeve for engaging said outermost surface outwardly from said raised cam surface to release the tension on said pivot bolt, thereby releasing said clutch discs from each other to unclamp said frame from said standard."
2. A tiltable work holder in accordance with claim 1 comprising, in combination, a transverse work support bar slidably mounted at its ends on the opposed side members of said frame, and fastening means on said bar end for releasably fastening it to the respective side member of said frame, comprising a pair 'of parallel extensions on said end embracing said side member and means for drawing said extensions toward each other to clamp said bar to said side member.
References Cited in the file of this patent UNITED STATES PATENTS 456,164 Scudder July 21,1891- 476,754 Mendelson June 7, 1892 854,984 Corbett May 28, 1907 1,164,395 Reiselt Dec. 14, 1915 1,273,981 Adams July 30, 1918 1,600,835 Manley Sept. 21, 1926 1,792,612 Staley Feb. 17, 1931 1,834,294 Spahn Dec. 1, 1931 1,969,310 Lowrie et al. Aug. 7, 1934 2,567,384 Lie'tz Sept. 11,1951
FOREIGN PATENTS 747,480 France June 17, 1933 The various clamps are released,