US2662708A - Tiltable support - Google Patents

Description

Dec. l5, 1953 c. .1. SCHMITT 2,662,708

TILT/ABLE SUPPORT Filed Dec. 29, 1950 \`v :ZJ

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Patented Dec. l5, 1953 UNITED STATES PATENT OFFICE TILTBLE SUPPORT Charles J. Schmitt, Chicago, Ill., assignor to Lovejoy Flexible Coupling Co., Chicago, Ill., al corporation of Illinois Application December 29, 1950, Serial No.-2ll3,357

l Claims. l

rThis invention relates to supports for electric motors and the like which are manually tiltable by rotation of a screw to vary the inclination of the supporting surface.

The general object is to provide a support of the above character which is substantially simpler in construction than prier similar supports, and which enables a ner adjustment of the supported surface to be obtained.

A more detailed object is to connect the tiltable support to its base through the medium oin a diierentially acting screw.

Other objects and advantages. of the inven tion will become apparent frein the following detailed description taken in connection withV the accompanying drawings, in which:

Figure l is a fragmentary side elevational View showing an electric motor mounted on a tiltable support embodying the novel features of the present invention with a part of the support being broken away and shown in section.

2 is a longitudinal sectional view taken along the line 2 2 of Fig. 3.

Figs. 3 and 4 are fragmentary views taken respectively along the lines 3--3 and l 2.

As shown in the illustrative embodiment, the improved supper is especially useful in mounting an electric motor lil on a base il for tilting ol' the rnotor shaft l2 in an are i3 by turning a hand crank it in a corresponding direction. The base is generally rectangular and has a dat bottorn surface and a lug iii rigid with and upstanding from the base center. The lug is formed with a transverse hole le through which extends a pin il held against longitudinal shifting as by a set screw le projecting into a circumferentially extending slot in the pin.

The pin li denes the axis or tilting of the motor whose base le is secured to a member Eil pivotally supported intermediate its ends on the pin il. Herein, the member comprises two rigid bars El having flattened surfaces 22 at opposite ends against which the four corners of the motor bese l@ may be clamped by bolts 23. Rigid with depending from bar midway between its ends is an arm 2s whose lower end is aper tured to receive one end oi the pivot pin il. One is secured to the pin. by a set screw 25 while the other is slidable on the other end of the pin to permit lateral adjustment, of one bar accord-- ing to the width of the base on the motor to be supported.

Upstanding from one end of the base li and spaced along the latter from the pivot il is a lug 2li having a notch at its upper end spanned by a cross-pin tt which is disposed somewhat above the level of the pivot i i and extends parallel to the latter. Within the slot, the pin is formed with a hole t@ of a dia?. eter substantially equal to the width of the slot an@ internally threaded to receive and mate with the ccrresponding threads 3Q on the outer end portion o a screw shaft 3l. Thus, the cross-pin te ccnstitutes a tiltable nut journaled on the base ll. A disk 32 fast on the outer end of this shaft carries the crank ill which may be turned to ad Vance the shaft endwise through the tiltable nut 28 which is centered relative to the lug by engagement ci the sides of the sci-ew with the walls of the notch 2l.

In accordance with the present nvention, the endwise motion of the screw t 3| is coinmunicated to the tiltablel support 2li by a threaded connection related in a novel manner to the screw and nut above described. Zrierein, the connection comprises a thread 33 cut on the other end portion of the shaft lll and mating with the interior of a hole Sil which extends diaineti'ically through a nut 35. The latter comprises a rod spanning the depending arms 2d on the member with its opposite ends journaled in the arms and spaced above the pivot Il'. The threads and 33 are of different pitches respectively having 16 and 28 turns per inch in the present instance, both threads extending helically around the shaft Si! in the same direction.

By virtue of the difference in the pitch oi the two threads, two given points on the two threads will advance at different rates relative to their mating nuts during rotation of the shaft Si either direction. Because of this difference and the fact that the nut te is journaled on the l l, the other nut 35 will move back and forth the shaft is turned in opposite directions. The membe 2e on which the nut is carried may thus be tilted in either direction from the horizontal position shown in Fig. 2 in which the shalt is disposed horizontally by virtue or" location of the nuts at the same level above the bottoni of the oase 2l. As an incident to suc-h tilti the shaft 3l also tilts as shown in i but 'to a lesser degree. This is permitted by virtue of the loose mounting of the nuts and in the lug ld and the arnis By employing the threaded connection between the shaft 3i and the supporting member it, the overall construction is greatly simplified since only boring and threading operations are required. Moreover, there is no danger of binding between the relatively moving parts and in addition, the desired neness of adjustment may be achieved simply by selecting the proper didier- 3 ence in the pitches of the two threads 30 and 33.

I claim as my invention:

1. A tilting support comprising a base, a mem ber having an upper supporting surface and a depending arm intermediate its ends, a pin pivotally connecting said base and the lower end of Said arm for swinging of the member about an axis paralleling the bottom of the base and said surface, a nut paralleling said pin and journaled in said arm between said surface and the pin, said nut having a hole extending diametrically therethrough with an internal thread of a predetermined pitch, a second nut mounted on and spaced along said base from said first nut and having a horizontally extending hole alined with said rst hole, said second hole having an internal thread of a pitch diering from that of said first hole, a screw shaft extending through said two holes and having opposite threaded end portions mating with the threads of the respective holes, and a means on one end of said shaft by which the shaft may be turned to tilt said member relative to said base and about said axis.

2. A tiltable support comprising a base, a horizontal pivot pin mounted thereon, two bars having upper supporting surfaces and mounted on opposite end portions of said pin to swing about the axis thereof, one of said bars being adjustable along the axis of said pin, a screw shaft disposed above and extending transversely of said axis, means rotatably connecting said shaft to said bars above said axis for rocking of the bars in accordance with the endwise movement of the shaft, a nut threaded onto said shaft at a point spaced from said connection, means on said base supporting said nut to rock about an axis paralleling said pivotal axis, and walls rigid with said base and engageable with said shaft on opposite sides thereof to position the shaft laterally.

3. In a tilting support, the combination of, a base member, a supporting member mounted on said base member for swinging about an axis extending across the base member, a screw shaft extending transversely of said axis, threads of diiferent pitch formed along opposite end portions of said shaft, two nuts, one threaded onto each of said shaft end portions, a connection between one of said nuts and said base member, and a second connection between the other of said nuts and said supporting member, the connection between at least one of said nuts and the associated member including relatively mov able parts connected respectively to said one nut and said associated member to permit relative turning between the two.

e. A tilting support comprising a base, a supporting member pivotally mounted on said base to swing about a first axis extending across the base, a screw shaft extending transversely of said axis, threads of different pitch formed along opposite end portions of said shaft, a nut threaded onto one of said shaft end portions and connected to said member for turning relative thereto. and a second nut threaded on the opposite end portion of said shaft and connected to said base for turning relative to the same, said nuts turning about axes paralleling said rst axis.

CHARLES J. SCHMITT.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 499,291 Gury June 13, 1893 1,361,577 Harbord Dec. 7, 1920 1,935,873 Hamerstadt Nov. 21, 1933 2,395,625 Heyer Feb. 26, 1946 2,415,820 Herring Feb. 18, 1947 2,525,534 Ernisse Oct. 10, 1950

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