US2690942A - Folding tray leg structure with spring lock - Google Patents

Folding tray leg structure with spring lock Download PDF

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US2690942A
US2690942A US281389A US28138952A US2690942A US 2690942 A US2690942 A US 2690942A US 281389 A US281389 A US 281389A US 28138952 A US28138952 A US 28138952A US 2690942 A US2690942 A US 2690942A
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tray
legs
notches
leg
rods
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US281389A
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Marcus Benjamin
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B3/00—Folding or stowable tables
    • A47B3/08—Folding or stowable tables with legs pivoted to top or underframe
    • A47B3/0809—Folding or stowable tables with legs pivoted to top or underframe with elastic locking means
    • A47B3/0815—Folding or stowable tables with legs pivoted to top or underframe with elastic locking means the resilient force of the elastic locking means acting in a direction perpendicular to the axis of rotation of the leg
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B23/00—Bed-tables; Trays; Reading-racks; Book-rests, i.e. items used in combination with something else
    • A47B23/001—Trays, e.g. with foldable legs

Definitions

  • This invention relates to a folding tray leg structure with spring lock.
  • the tray which is herein described and claimed is intended for use in hospitals but it may also be used at home and in hotels and elsewhere.
  • the principal object of this invention is the provision of a foldable tray which may be carried from place to place in folded position and which may be placed upon a bed or other suitable support in unfolded position. When it is in folded position, it functions as a serving tray; when it is in unfolded position, it functions as a table on which food may be served and consumed.
  • This foldable tray consists of a tray portion and legs to support it. The legs are pivotally connected to the tray and they may be folded upwardly fiat against the tray or they may be swung downwardly into perpendicular relation to the tray. When the legs are flat against the tray, the tray may be used for carrying and serving purposes. When the legs are in perpendicular relation to the tray, the tray becomes a table which is adapted to be placed on any suitable horizontal surface, such as a hospital bed. The legs are so disposed that they straddle the patient lying or sitting in bed.
  • An important feature of this invention is the locking and unlocking mechanism whereby the legs are locked at against the tray or in perpendicular relation thereto and whereby they may b-e unlocked from either position so that they may be swung to the other position. More specifically, notches are provided in the legs for engagement with spring-urged rods on the tray. When the legs are fiat against the tray, they may be released by simply disengaging the rods from one group of notches and the legs would then drop of their own weight into perpendicular relation to the tray. The spring-urged rods on the tray would automatically engage a second group of notches in the legs and the legs would thereby be locked in perpendicular position.
  • the legs may be unlocked from such perpendicular position by simply disengaging the rods from the last mentioned group of notches and then swinging the legs up against the tray.
  • the rods would once again automatically engage the rst group of notches in the legs and the legs would thereby be locked in folded position.
  • a very handy mechanism is thereby provided which makes for easy handling of the tray and for quick conversion to a table and back again to a tray. lThe mechanism is also easy to keep clean since its parts are few, simple and fully exposed.
  • Fig. 1 is a side View of a foldable tray made in accordance with this invention, said tray being shown in unfolded position and serving as a table.
  • Fig. 2 is an end viewof the same tray, also showing it in unfolded position and serving as a table, said view being indicated by arrows 2, 2 of Fig. 1.
  • Fig. 3 is an enlarged, fragmentary view looking in the direction of arrows 3, 3 of Fig. 2, the tray being partly broken away to expose the release mechanism by which the legs are unlocked from either of their two positions.
  • Fig. 4 is an enlarged fragmentary section on the line 4 4 of Fig. 2.
  • Fig. 5 is an enlarged fragmentary section on the line 5 5 of Fig. 2.
  • the hospital tray I0 herein described and claimed is shown in unfolded or opened position in Fig. 1 and it will be understood that in such position it constitutes a table of the type which may be placed on hospital beds and the like, a1- though it is certainly not limited to such use.
  • It comprises a tray portion or element i2 and a pair of double leg elements I4 and I6 respectively.
  • the leg elements are pivotally connected to the tray element and they are swingable from one to the other of two positions: the solid line position in Fig. 1 wherein the leg elements stand vertically and support the tray element as a table top, andthe broken line position in Fig. 1 wherein the leg elements are folded flat against the tray element and render the latter useful as a serving tray.
  • Torsion springs 22 may be mounted on bolts I8 for engagement with the legs and tray to urge the legs into their vertical positions perpendicular to the tray. These springs would assist gravity in swinging the legs from their broken line positions to their solid line positions once they are released for such movement.
  • bolts for this purpose is, of course, purely illustrative, and other pivoting means such as rods, pins and rivets may also be used for the same purpose.
  • Each leg element comprises a U-shaped element or member with two foot or pad portions 26 constituting the two lower corners thereof.
  • the upright portions of the leg elements are designated in the drawing by means of reference characters 26 and the horizontal yoke between the feet or pads is designated by reference character 28.
  • Bolts I8 and 2G extend through the upper ends of upright portions 26 as Figs ⁇ l, 2 and 4 clearly show.
  • Rods 30 may be secured to said upright positions for rigidity.
  • each upright 26 has two notches 32 and 3 formed therein at equal distances from the pivotal axis.
  • the upper notch 32 is somewhat shallow and the lower notch 34 is relatively deep for reasons which will shortly appear,
  • a bracket of inverted U shape, designated 36 in the drawing, is secured to each end of the tray and it is on this bracket that the leg ele ments are pivotally supported by means of bolts i8 and 20.
  • Areuate slots 38 are formed in the brackets and rods i0 are slidably disposed in said slots for movement into and out of engagement with notches 32 and Sii.
  • leg elements lli and I6 When leg elements lli and I6 are in vertical position, rod 550 is engageable with their notches Sli to lock said leg elements in such position; when the leg elements are in horizontal position, rod l0 is engageable with their notches 32 to hold them in such position.
  • each rod l0 is a linger piece l2 which is also pivotally supported by bracket 36 and more particularly by downwardly struck portions llfi and pin d6 extending therethrough.
  • a torsion spring d8 is mounted on said pin and it will be seen that one end engages the bracket E and the other end engages the linger piece 137:. The action of the spring is to urge 'the linger piece inwardly, that is, rightwardly as Viewed in Fig. 5. Since the nger piece is mounted on rod lit, the spring acts upon said rod through said finger piece and urges it into engagement or holds it in engagement with notches 32 and 34.
  • leg elements are thereby locked in their respective positions relative to the tra-y and they may be released from their locked positions by simply pulling the iinger pieces outwardly to their broken line positions (Fig. 5) to disengage rods 4G from notches 32 and 34.
  • Notches 34 are relatively deep to prevent rods 40 from slipping out when an endwise force is applied to the leg elements to shift them from one position to another without releasing the rods from their respective notches.
  • Notches 32 are rather shallow so as not to resist too strongly an attempt to swing the leg elements downwardly from their dotted line positions in Fig. 1 without prior actuation of finger pieces d2, this being something that may happen when a person unfamiliar with the mechanism of the tray tries to lower the legs by simply grasping them and pulling them down.
  • leg element swinging in clockwise direction from its position in Fig. 1 because of its engagement with a pair of fingers 5i) on brackets 35. Similarly, leg element i5 is prevented from swinging in counterclock* wise direction beyond its Fig. l position by another pair of fingers 50 on the other bracket 35.
  • Another movement limiting factor involves rods il!) in arcuate slots 33. The ends of said slots prevent the rods from moving in either lateral direction beyond a predetermined point.
  • the tray element I2 may be made in various sizes and shapes and with or without side walls. as well as of any suitable material, such as aluminum or stainless steel. This, of course, is also true of the legs, and the shape of leg elements lf2 and i6 as shown in Fig. 2 is purely illustrative of what may be done within the broad scope of the invention. Tray l2 with its back wall 52 and its two side walls 54 and its inwardly turned front skirt 5S is also illustrative of the invention and variations may be incorporated therein.
  • a ioldable tray for serving food comprising a tray, brackets secured to the ends of the tray, transversely extending pintles supported by said brackets at each end of said tray, Ushaped leg elements supporting each end of the tray, each leg element having registering holes formed at the top of its two arm portions to accommodate the pintles which are situated at the same end of the tray as each said leg element, said leg elements being pivotally rotatable on said pintles upwardly into parallel relation to the tray and downwardly into perpendicular relation thereto, torsion springs on said pintles, one end of said torsion springs bearing against the tray and the other end bearing against said U-shaped leg elements to urge said leg elements downwardly into perpendicular relation to the tray, arcuate slots formed in said brackets in concentric relation to said pintles, locking rods mounted in said slots in parallel relation to the pintles, a pair of notches formed in each arm of each U-shaped leg element for engagement with said locking rods, one notch of each pair of notches being engaged with

Description

Gat., 5, 54 B. MARCUS 2,690,942
FOLDING TRAY LEG STRUCTURE WITH SPRING LOCK Filed April 9, 1952 5E/WAM nv MARcus' nNvl-:N-roR Bwgdgm ATTORNEY Patented Oct. 5, 1954 UNITED STATES PATENT OFFICE FOLDING TRAY LEG STRUCTURE WITH SPRING LOCK 1 Claim. 1
This invention relates to a folding tray leg structure with spring lock.
The tray which is herein described and claimed is intended for use in hospitals but it may also be used at home and in hotels and elsewhere.
The principal object of this invention is the provision of a foldable tray which may be carried from place to place in folded position and which may be placed upon a bed or other suitable support in unfolded position. When it is in folded position, it functions as a serving tray; when it is in unfolded position, it functions as a table on which food may be served and consumed. This foldable tray consists of a tray portion and legs to support it. The legs are pivotally connected to the tray and they may be folded upwardly fiat against the tray or they may be swung downwardly into perpendicular relation to the tray. When the legs are flat against the tray, the tray may be used for carrying and serving purposes. When the legs are in perpendicular relation to the tray, the tray becomes a table which is adapted to be placed on any suitable horizontal surface, such as a hospital bed. The legs are so disposed that they straddle the patient lying or sitting in bed.
An important feature of this invention is the locking and unlocking mechanism whereby the legs are locked at against the tray or in perpendicular relation thereto and whereby they may b-e unlocked from either position so that they may be swung to the other position. More specifically, notches are provided in the legs for engagement with spring-urged rods on the tray. When the legs are fiat against the tray, they may be released by simply disengaging the rods from one group of notches and the legs would then drop of their own weight into perpendicular relation to the tray. The spring-urged rods on the tray would automatically engage a second group of notches in the legs and the legs would thereby be locked in perpendicular position. By the same token the legs may be unlocked from such perpendicular position by simply disengaging the rods from the last mentioned group of notches and then swinging the legs up against the tray. The rods would once again automatically engage the rst group of notches in the legs and the legs would thereby be locked in folded position.
A very handy mechanism is thereby provided which makes for easy handling of the tray and for quick conversion to a table and back again to a tray. lThe mechanism is also easy to keep clean since its parts are few, simple and fully exposed.
A preferred form of this invention is shown in the accompanying drawing in which:
Fig. 1 is a side View of a foldable tray made in accordance with this invention, said tray being shown in unfolded position and serving as a table.
Fig. 2 is an end viewof the same tray, also showing it in unfolded position and serving as a table, said view being indicated by arrows 2, 2 of Fig. 1.
Fig. 3 is an enlarged, fragmentary view looking in the direction of arrows 3, 3 of Fig. 2, the tray being partly broken away to expose the release mechanism by which the legs are unlocked from either of their two positions.
Fig. 4 is an enlarged fragmentary section on the line 4 4 of Fig. 2.
Fig. 5 is an enlarged fragmentary section on the line 5 5 of Fig. 2.
The hospital tray I0 herein described and claimed is shown in unfolded or opened position in Fig. 1 and it will be understood that in such position it constitutes a table of the type which may be placed on hospital beds and the like, a1- though it is certainly not limited to such use. It comprises a tray portion or element i2 and a pair of double leg elements I4 and I6 respectively. The leg elements are pivotally connected to the tray element and they are swingable from one to the other of two positions: the solid line position in Fig. 1 wherein the leg elements stand vertically and support the tray element as a table top, andthe broken line position in Fig. 1 wherein the leg elements are folded flat against the tray element and render the latter useful as a serving tray.
Bolts IS and 2B serve as the pintle elements for pivotally attaching the legs to the tray. Torsion springs 22 may be mounted on bolts I8 for engagement with the legs and tray to urge the legs into their vertical positions perpendicular to the tray. These springs would assist gravity in swinging the legs from their broken line positions to their solid line positions once they are released for such movement. The use of bolts for this purpose is, of course, purely illustrative, and other pivoting means such as rods, pins and rivets may also be used for the same purpose.
Each leg element comprises a U-shaped element or member with two foot or pad portions 26 constituting the two lower corners thereof. The upright portions of the leg elements are designated in the drawing by means of reference characters 26 and the horizontal yoke between the feet or pads is designated by reference character 28. Bolts I8 and 2G extend through the upper ends of upright portions 26 as Figs` l, 2 and 4 clearly show. Rods 30 may be secured to said upright positions for rigidity.
It will be noted that each upright 26 has two notches 32 and 3 formed therein at equal distances from the pivotal axis. The upper notch 32 is somewhat shallow and the lower notch 34 is relatively deep for reasons which will shortly appear, A bracket of inverted U shape, designated 36 in the drawing, is secured to each end of the tray and it is on this bracket that the leg ele ments are pivotally supported by means of bolts i8 and 20. Areuate slots 38 are formed in the brackets and rods i0 are slidably disposed in said slots for movement into and out of engagement with notches 32 and Sii. When leg elements lli and I6 are in vertical position, rod 550 is engageable with their notches Sli to lock said leg elements in such position; when the leg elements are in horizontal position, rod l0 is engageable with their notches 32 to hold them in such position.
Mounted on each rod l0 is a linger piece l2 which is also pivotally supported by bracket 36 and more particularly by downwardly struck portions llfi and pin d6 extending therethrough. A torsion spring d8 is mounted on said pin and it will be seen that one end engages the bracket E and the other end engages the linger piece 137:. The action of the spring is to urge 'the linger piece inwardly, that is, rightwardly as Viewed in Fig. 5. Since the nger piece is mounted on rod lit, the spring acts upon said rod through said finger piece and urges it into engagement or holds it in engagement with notches 32 and 34. The leg elements are thereby locked in their respective positions relative to the tra-y and they may be released from their locked positions by simply pulling the iinger pieces outwardly to their broken line positions (Fig. 5) to disengage rods 4G from notches 32 and 34. Notches 34 are relatively deep to prevent rods 40 from slipping out when an endwise force is applied to the leg elements to shift them from one position to another without releasing the rods from their respective notches. Notches 32, on the other hand, are rather shallow so as not to resist too strongly an attempt to swing the leg elements downwardly from their dotted line positions in Fig. 1 without prior actuation of finger pieces d2, this being something that may happen when a person unfamiliar with the mechanism of the tray tries to lower the legs by simply grasping them and pulling them down.
Certain movement limiting factors deserve mention. Leg element swinging in clockwise direction from its position in Fig. 1 because of its engagement with a pair of fingers 5i) on brackets 35. Similarly, leg element i5 is prevented from swinging in counterclock* wise direction beyond its Fig. l position by another pair of fingers 50 on the other bracket 35. Another movement limiting factor involves rods il!) in arcuate slots 33. The ends of said slots prevent the rods from moving in either lateral direction beyond a predetermined point.
l2 is prevented from 4 The tray element I2 may be made in various sizes and shapes and with or without side walls. as well as of any suitable material, such as aluminum or stainless steel. This, of course, is also true of the legs, and the shape of leg elements lf2 and i6 as shown in Fig. 2 is purely illustrative of what may be done within the broad scope of the invention. Tray l2 with its back wall 52 and its two side walls 54 and its inwardly turned front skirt 5S is also illustrative of the invention and variations may be incorporated therein.
I claim:
A ioldable tray for serving food, comprising a tray, brackets secured to the ends of the tray, transversely extending pintles supported by said brackets at each end of said tray, Ushaped leg elements supporting each end of the tray, each leg element having registering holes formed at the top of its two arm portions to accommodate the pintles which are situated at the same end of the tray as each said leg element, said leg elements being pivotally rotatable on said pintles upwardly into parallel relation to the tray and downwardly into perpendicular relation thereto, torsion springs on said pintles, one end of said torsion springs bearing against the tray and the other end bearing against said U-shaped leg elements to urge said leg elements downwardly into perpendicular relation to the tray, arcuate slots formed in said brackets in concentric relation to said pintles, locking rods mounted in said slots in parallel relation to the pintles, a pair of notches formed in each arm of each U-shaped leg element for engagement with said locking rods, one notch of each pair of notches being engaged with one of said locking rods when the leg element in which it is formed is in parallel relation to the tray, the other notch of each pair of notches being engaged with said locking rod when the leg element in which it is formed is in perpendicular relation to the tray, said leg elements being adapted to be locked in either of said positions, and handles pivotally mounted to brackets secured to the ends of the tray and connected to the adjacent locking rods, said handles being manually pivoted on said brackets to move the locking rods in said slots into and out of engagement with said notches.
References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,203,783 Rieschmann Nov. '7, 1916 1,709,928 Whitney Apr. 23, 1329 1,962,126 Andersen June 12, 1934 2,215,093 Boardman Sept. 1'7, 1940
US281389A 1952-04-09 1952-04-09 Folding tray leg structure with spring lock Expired - Lifetime US2690942A (en)

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757713A (en) * 1954-01-12 1956-08-07 Mellvin D Jerdee Combination seat, table and benches
US2800379A (en) * 1956-04-05 1957-07-23 Wayne F Smithers Leg lock for folding tables
US2801894A (en) * 1956-06-01 1957-08-06 Marie D Macinnes Shelf step for counter cabinets and the like
US2997127A (en) * 1959-10-07 1961-08-22 Wojtowicz Michael Stepladder with improved stabilizing legs
US3267886A (en) * 1964-06-01 1966-08-23 Fort Smith Plywood Company Leg mounting means for furniture
US4311099A (en) * 1980-04-28 1982-01-19 Judith Roberts Lap tray
FR2531324A1 (en) * 1982-08-05 1984-02-10 Kusch Co Sitzmoebel FOLDING TABLE HARDWARE
EP0594466A1 (en) * 1992-10-23 1994-04-27 Rolf O. Anderson Apparatus for securing an article to a users leg
US5490467A (en) * 1994-12-23 1996-02-13 Howe Furniture Corporation Folding table mechanism
US5673633A (en) * 1995-05-31 1997-10-07 Pfister; Joel W. Table leg system
US6149148A (en) * 1998-07-11 2000-11-21 Heidelberger Druckmaschinen Aktiengesellschaft Hurdle or rack board for sheet-fed printing machines
US6394005B1 (en) 2000-07-28 2002-05-28 Valley Design Enterprises, Inc. Articulating locking mechanism
US6561107B1 (en) * 2000-05-19 2003-05-13 Lockermate Corporation Foldable shelf assembly
US20070095257A1 (en) * 2005-10-31 2007-05-03 Hernandez Hector R Folding table assembly
US20120186499A1 (en) * 2011-01-21 2012-07-26 E-Lead Electronic Co., Ltd. Object holding table
US9457904B1 (en) * 2016-01-07 2016-10-04 Robert Karl Fey Sleeping platform for use on aircraft
US10723015B1 (en) * 2019-06-24 2020-07-28 Timothy Vallow Tire top tool tray apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1203783A (en) * 1915-10-06 1916-11-07 Henry R Reischmann Folding table.
US1709928A (en) * 1926-08-03 1929-04-23 Samuel Zimmer Service tray
US1962126A (en) * 1931-02-28 1934-06-12 Simmons Co Folding table
US2215093A (en) * 1938-11-22 1940-09-17 Ferguson Brothers Mfg Company Folding table

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1203783A (en) * 1915-10-06 1916-11-07 Henry R Reischmann Folding table.
US1709928A (en) * 1926-08-03 1929-04-23 Samuel Zimmer Service tray
US1962126A (en) * 1931-02-28 1934-06-12 Simmons Co Folding table
US2215093A (en) * 1938-11-22 1940-09-17 Ferguson Brothers Mfg Company Folding table

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757713A (en) * 1954-01-12 1956-08-07 Mellvin D Jerdee Combination seat, table and benches
US2800379A (en) * 1956-04-05 1957-07-23 Wayne F Smithers Leg lock for folding tables
US2801894A (en) * 1956-06-01 1957-08-06 Marie D Macinnes Shelf step for counter cabinets and the like
US2997127A (en) * 1959-10-07 1961-08-22 Wojtowicz Michael Stepladder with improved stabilizing legs
US3267886A (en) * 1964-06-01 1966-08-23 Fort Smith Plywood Company Leg mounting means for furniture
US4311099A (en) * 1980-04-28 1982-01-19 Judith Roberts Lap tray
FR2531324A1 (en) * 1982-08-05 1984-02-10 Kusch Co Sitzmoebel FOLDING TABLE HARDWARE
US4561622A (en) * 1982-08-05 1985-12-31 Eberhard Heinzel Folding table catch
EP0594466A1 (en) * 1992-10-23 1994-04-27 Rolf O. Anderson Apparatus for securing an article to a users leg
US5490467A (en) * 1994-12-23 1996-02-13 Howe Furniture Corporation Folding table mechanism
US5673633A (en) * 1995-05-31 1997-10-07 Pfister; Joel W. Table leg system
US6149148A (en) * 1998-07-11 2000-11-21 Heidelberger Druckmaschinen Aktiengesellschaft Hurdle or rack board for sheet-fed printing machines
US6561107B1 (en) * 2000-05-19 2003-05-13 Lockermate Corporation Foldable shelf assembly
US6394005B1 (en) 2000-07-28 2002-05-28 Valley Design Enterprises, Inc. Articulating locking mechanism
US20070095257A1 (en) * 2005-10-31 2007-05-03 Hernandez Hector R Folding table assembly
US7341006B2 (en) * 2005-10-31 2008-03-11 Alltrade Tools Llc Folding table assembly
US20080210143A1 (en) * 2005-10-31 2008-09-04 Alltrade Tools Llc Folding Table Assembly
US7546810B2 (en) * 2005-10-31 2009-06-16 Alltrade Tools Llc Folding table assembly
US20090241805A1 (en) * 2005-10-31 2009-10-01 Alltrade Tools Llc Folding Table Assembly
US20120186499A1 (en) * 2011-01-21 2012-07-26 E-Lead Electronic Co., Ltd. Object holding table
US8322292B2 (en) * 2011-01-21 2012-12-04 E-Lead Electronic Co., Ltd. Object holding table
US9457904B1 (en) * 2016-01-07 2016-10-04 Robert Karl Fey Sleeping platform for use on aircraft
US10723015B1 (en) * 2019-06-24 2020-07-28 Timothy Vallow Tire top tool tray apparatus

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