USRE13832E - vaalee - Google Patents

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Publication number
USRE13832E
USRE13832E US RE13832 E USRE13832 E US RE13832E
Authority
US
United States
Prior art keywords
platform
carriage
desk
bell
latch
Prior art date
Application number
Other languages
English (en)
Inventor
Jests Vaaleb
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  • My present invention is an improvement in the mechanism of United States Letters Patent No. 934,861, granted to me September 2l, 1909; and it relates, particularly, to improvement in the locking means for securing the carriage in its advance position preparatory to raising the type-writer platform and against rearward displacement by such raising; the object being to simplify the construction of the locking means and improve the operation thereof in automatically locking the carriage in the Vposition stated and releasing it by lowering the platform to the position from which it is moved backwardly into the housing.
  • Figure 1 is aview in sectional elevation of a deskpedestal equipped with the mechanism of said patent in its improved form, the section being taken on line 1, Fig. 6;
  • Fig. 2 is a side view of the said pedestal with a wall broken away to show the mechanism within 1t in elevation in the position of the parts represented in Fig. 1, namely with the platform' in its lowered and housed position;
  • Fig.- 3 is a similar view showing the platform in its withdrawn and raised position;
  • Fig. 4 is a section on line 1, Fig. 6, like. Fig. 1, but broken and showing the yposition of the parts when the platform has been withdrawn and raised;
  • Figs. 5, 6 and 7 are broken sections taken, respectively, on lines 5, 6 and 7 .I the locking-lever 4 While, asstated in the aforesaid patent,
  • FIG. 4 is a perspective view of device.
  • the invention is notonly applicable to a desk-typewriter but is equally applicable to'other devices adapted to be used in connection with and housed within a ⁇ cabinet, pedestal or the like, the following description is confined to the mechanism in the pedestal of a desk.
  • Corresponding rails'8, i8, forming a carriage-track are secured to the inner faces of the opposite sides of a desk-pedestal, and at their outer ends to the front l posts 9 of the pedestal at circular recesses 10A Specification of Ressued Letters Patent. Reis-Sued NOV. 24, 1914.
  • the rails are additionally supported, between their ends, by hanger-bars 13.
  • the carriage is a pair of similar metal plates 141-, lll, of general rectangular shape,- each terminating at its forward end in a nose 15, these plates being rigidly connected near-'their rear ends by a rod 16l bent into yoke-shape, each plate carryin g on the outer face of its rear lower corner a peripherallygrooved guide-wheel 17, above which and to one side of its center projects a headed stud 1.8; and a similar guide-wheel 19 is journaled on the diagonally-opposite corner of each carriage-plate.
  • 'l'he carriage is confined on the track to ride thereon by embracing each rail 8 between the grooved wheels on a plate or side, the stud 18 on the latter preventing the carriage from leaving the track.
  • Similar bell-cranks 20, 20 are journaled at their angles to the noses 15 of the two carriage-plates at their inner faces, and other bell-cranks 21, like the vforward ones, are journaled at their angles to the inner faces of the plates near their rear ends, in horizontal alinement withtlie journals of the forward bell-cranks; and the longer arms of the bell-cranks 21 are connected between their ends by a cross-rod 22, the members 20l and 21 of each pair of the bell-cranks being pivotally connected at the ends of their shorter arms vby a. bent link Q3.
  • Spiral springs, 24, 24 connectthe cross-member of the rod 16, near its ends, with the rod Q2.
  • the platform 25 is firmly secured at its edges to bars 26, each' pivo-tally connecting the members of a pair of the bell-cranks 20,
  • each bell-crank 20, and about midway between its ends, projects a stud 30, and a stud 31 projects from the outer face of each carriage-side, or plate 14, to which latter is fulcrumed between its ends a lever 32 of the preferred shape best shown in Fig. 8,-having an expanded and relatively heavy rear-end portion, a recess 33 in the upper edge of its forward-portion toclear the stud 31, a tongue or pawl 34 adj acent'to the recess to enter a notch 12, and a latch 35 to engage a.
  • this latch extending from a section ofthe lever 32. bent, at 36, to offset or shoul- 'der it at its lower-edge portion and thereby extend it across the lower edge of the adjacent carriage-side and thus to cause the latch to project at the inner face of that side into the path of a stud 30.
  • the stud31 serves the same purpose at the forward end of a carriage-side that the stop 18 serves at the inner end thereof.
  • I claim f y y 1. In combination, a desk, a cabinet, or the like, housing a carriage track and a carria e movablethereon and carrying bell-cran link-connected in pairs, with a platform pivotally supported on the longer .bell crank arms, a catch on the track, a stud on one of said arms, and a lever fulcrumed between its ends on a. side of said carriage totend to latches' 35 ⁇ with the studs 30; In lowering d rop by gravity at its inner end and pro' vided with a pawl to engage said catch and lock the carriage in its advance position, and
  • a latch to engage said stud for locking the bell-cranks against turning in the movements of the carriage.
  • levers fulcrumed to the carriage side to tend to dropy by gravity at their inner ends andprovided with forward pa-wls to engage said catches and lock the-carriage in its advance position and latches forward of the pawls to engage said studs for locking the bellcranks against turning in the movement' of the carriage.
  • a desk, a ⁇ platform mounted therein and adapted to be moved outwardly then upwardly means automatically operated for holding said. platform against inward movement while itis being Aplatform starts its upward a keepersecured to said desk, a lug raised, von said platfo'rm and adapted to engage said keeper for holding said platform against lateral movement after it has reachedl its raised position.
  • a desk a Aplatform support, a platform mounted thereon and adapted to be moved outwardly and then upwardly, a parallel link motion for raising said platform wh'en at its outer limitof motion, a rocking gravity latch pivoted upon said platform support and adapted to drop into position as the platform rises upward to restrain the latter from inward movement, said latch being-.so constructedand located as to be' lifted by one of Isaid links as the platform reaches its lowermost position, no
  • a platform support a platform, a plurality of substantially paralle levers for raising said platform' and so arranged that the platform is at all times maintained thereby in a hori'- zontal position, means part of said levers'at points on the opposite sides of the pivots from the platform to facilitate the raising operation, a gravity latch having a lu adapted to drop into engagement with a s oplder.
  • V11 -In apparatus of the class described, a track, acarriage, levers pivoted in said carjriage and incliidingfaV bell crank lever', a platform supported by said levers and maintained at all times in horizontal positionthereby, a gravity latch mounted in said 'carriage and adapted to lock said carriage to said track as the platform starts upward Aand to be released by one arm of the bell crank lever as the platform reaches its lowermost position, in combination 'with means the same bell crank lever arm to lock the platform in lowermost position.

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