US1189871A - Table-forwarding mechanism. - Google Patents

Description

w. M. & P. DfROBERTS.

TABLE FORWARDING MECHANISM. APPLICATION FILED OCT. 3. 1914.

1,189,871. Patented July 4, 1915.

' WITNESSES: INVENTOHS (M Roberts.

@225 ZZZ RD. fioferta; F v Arm/m UNITED STATES PATENT OFFICE WEBSTER M. ROBERTS AND PARK 1). ROBERTS, OF ST. JOSEPH, MISSOURI.

TABLE-FORWARDING MECHANISM.

Application filed October 3, 1914. Serial No. 864,965.

T 0 all whom it may concern Be it known that we, WE'BSTER M. Rom

Bars and PARK D. ROBERTS, citizens of the United States, residing at St. Joseph, in the county of Buchanan and State of Missouri, have invented certain new and useful Improvements in Table-Forwarding Mechanism; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

Our invention relates to table forwarding mechanism, and more particularly to mechanism for imparting step by step motion to a rotary table; the principal object of the invention being to provide a device whereby a rotary table may be intermittently forwarded a predetermined distance and looked. after each movernent. In accomplishing this object we have provided the improved details of structure hereinafter described and illustrated in the accompanying drawings, wherein:

Figure I is a perspective view of a rotary table provided with a forwarding mechanism constructed in accordance with our invention. Fig. II is a plan view of the forwarding mechanism, showing-a por-- tion of the table. Fig. 111 is an enlarged sectional view of the forwarding pawl; the functional position thereof being shown in dotted lines. Fig. IV is a detail perspective view of a portion of the under face of the table.

Referring more in detail to the parts 1 designates a pedestal, or the like, having a central shaft 2, and revolubly mounted on said shaft is a table 3 which may be of.

any suitable construction, but preferably comprises a skeleton frame having inner Specification of Letters Patent.

paem'd atl 4,- 1916.

short distance beneath the under face of the ring 4. t

- Slidably mounted in the brackets 15011 the crossbar 13, and immediately beneath the ring 4 is an' arc-shaped bar 16, of the same curvature as the saidfring, and pivotally mounted between the ribs 17 onsaid bar is an angular pawl 18, one leg of which normally lies between the ribs 17 and is adapted to engage the teeth 9 and the other leg of which projects downwardly through a slot 20 in the bar. Integral with the pawl 18 is a stop21 which-is adapted to contact with the bar 16 to limit the movement of the pawl, as clearly shown in Fig. III.

Revolubly mounted inthe frame 10 is a shaft 22, having an eccentric disk'23 which carries a band 24 and rod 2 5 lthelatter being connected with the angular, pawl 18 by means of a universal coupling 26] Mounted near one end, of the bar 13 is a bracket 27in which is pivotally mounted a latch 28 having a notch 29 ada'pted to engage any one of the teeth Qofthe table:

The latch. 28 is yieldingly tensionedi upwardly by a" coil spring 30 whicl-rlbears' against a bracket 31 onthe -..c rossbar 13 and which surrounds a rod. 32that isconne'cted with the latch 28 and with abell crank? lever 33; the latter being pivotally' mounted in a bracket 34: on the crossbar-12 andadapted for engagement by 'a laterally extending boss 35 on the eccentric band 2 1.

In using the device, the shaft 22 and eccentric disk 23 are revolved by any suitable means, such as a motor (not shown) so that the rod 25 is reciprocated. 'On'the forward movement of the rod the angular pawl 18 is forced between ribs 17 and stopped so that continued movement of the eccentric causes the arc-shaped bar 16 to move in its brackets centric continues to revolve, the rod 25 is drawn forward so that the angular pawl is vmoved'against the shoulder2l and against the teeth 9 of the table so that continued revolution of the eccentric draws the bar 16 and the table forward. As soon as the table has moved a short distance the boss 35 releases the lever 33 and the latch 27 rises under the influence ofthe spring 30, so that when the eccentric has moved the'tabie to the limit of its travel, the latch automatically engages the next succeeding tooth .9 and locks the table against further move-- ment until. the cycle is repeated.

is apparent that with the herein de scribed mechanism, the table maybe forwarded at regular intervals and an equal distance at each movement, and that it. is locked positivelyat the end of each step.

Having thus described our inventiomwhat we claim as new therein, and desire to secure by Letters-Patent, is j .1. The combination ivith a rev'oluble member. of a sliding bar located. adjacent the revolub'le member and provided with aslot, a pawl pivotally mounted on the bar and projecting through the slot, one arm of said pawl being adapted for engagement with the reroluble niembcr,.and an eccentric having linkconnection with the other arm of the pawl. i

2. The combination with a revoluble member, having teeth on' its underface, of

ad a-rc'uatile bar located beneath tliefiaiithed' portion oit'the rerolubie member and adapted for movement in a path parallel therewith, a pawl pivotally mounted in the bar and having an arm adapted for engagement with said teeth, an eccentric connected with the opposite arm of the pawl and adapted for positively moving the pawl'to engagement with the teeth and advancing the rev-' oluble member upon forward movement of the bar, and for positively disengaging the pawl and returning said bar, for the purpose set forth.

The combination with a revol'uble member. of a bar movable adjacent the revoluble member, a pawl on said bar. an ecoluble member having teeth i a str p form meager-i centric operatirely'connecte" to positively induce engagen 11L oi with the revolubie member and positdisengage the same. a lock for holding, the

revoiubie member during the period of disengagement at the pawi, and means operable by the eccentric for controlling the lock.

4. The combination with an annular revnmed thereon; of a pawi "-arrier mounted adjacent to said teeth and adapted to be moved 151 a path parailel therewith, said pawl carrier having: a slot formed vertically through the central portion thercr. f; an angular pawl oscillatablymounted in said slot. the upper portion oit said pawl progectm; thereabovc whileits lower portion extends below said moved.

In testimony whereof We aliix our signzr tures in presence of two witnesses.

WEBSTER M. ROIV'HERTH. BARK D. R( )BER"S. 'itnesses Jonn Marts, JOHN Moron.

Weiy I

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