Title:
MUSIC STAND
United States Patent 3637172


Abstract:
A music stand having quick release lock for engaging a tubular support member to a plate base member where the plate base member is disposed substantially perpendicular to the tubular support member comprising, in preferred form, (a) a circular hole in the plate member in which the tubular member is received, the hole being sized to provide slip fit when the plate member and tubular member are assembled and the hole having a first center that establishes a center axis perpendicular to the plate member, (b) at least two pins mounted to the plate on opposite sides of the hole, the pins being disposed on a circle having a second center with that second center being offset a small distance relative to the first center, (c) a lock ring rotatable relative to the plate member having a pair of opposed arcuate slots engaged with the pins, the arcuate slots having a common third center which lies on the same center axis as the second center, and (d) a hole in the lock ring that establishes a fourth center, the fourth center being offset the same small distance relative to the third center as the second center is offset from the first center so that as the lock ring is rotated relative to the plate member the fourth center can move from a release position where the fourth center also lies on the same center axis as the first center to a lock position where the fourth center is offset relative to the center axis of the first center.



Inventors:
DIESBACH FREDERICK B
Application Number:
05/006917
Publication Date:
01/25/1972
Filing Date:
01/29/1970
Assignee:
KRAUTH & BENNINGHOFEN INC.
Primary Class:
Other Classes:
403/104, 403/350, D06/701
International Classes:
A47B19/00; (IPC1-7): A47B97/04
Field of Search:
248/411,413,414,457,460 287
View Patent Images:
US Patent References:
2593244Writing game planchette1952-04-15Batcha
2251253Clamping connection1941-07-29Miller
2250495Coupling1941-07-29Miller
2090000Adjustable and demountable book stand1937-08-17Hager et al.
1782660Stand and mounting1930-11-25Meyer
0171272N/A1875-12-21



Primary Examiner:
Schultz, William H.
Parent Case Data:


This application is a divisional application of pending U.S. Ser. No. 789,180, filed Jan. 6, 1968 now abandoned.
Claims:
Having described my invention and the preferred embodiment thereof in complete detail, what I desire to claim and protect by Letters Patent is

1. A music stand comprising:

2. A music stand as set forth in claim 1 further comprising:

3. A music stand as set forth in claim 1 including:

Description:
This invention relates to locks. More particularly, this invention relates to a quick release lock for a music stand adapted to positively engage a tubular support member with a plate base member when the plate base member is disposed substantially perpendicular to the tubular support member.

There are numerous end uses for a quick release lock of the type adapted to join together a tubular member and a plate member wherein the plate member is positioned substantially perpendicular to the axis of the tubular member. One common use of such a lock is in the area of music stands. A music stand generally comprises a desk pivotally connected to a tubular support member at one end and a base connected to the tubular support member at is other end. The tubular support is vertically positioned during use and may be made vertically adjustable in a telescoping type action. The desk usually is capable of being angled relative to the vertical to present the music at the desired attitude preferred by the musician. The base is generally either of the plate type or of the collapsing tripod type. By the plate type is meant a base that is relatively flat even though it may take any number of desired shapes, for example, trifooted, quadrafooted, circular, or the like.

It is most desirable in the case of music stands to provide a structure which is readily collapsible into a sufficiently small or compact space so that the stand can be easily transported from one location to another. The pivotable desk on the music stand permits the desk to be pivoted into a position where the desk's back is substantially parallel to the axis of the tubular support member. Also, the tubular support member, because of its telescoping type construction, can be compressed together into a length almost one-half that of its extended most length.

It is additionally desirable that the base of the music stand be removable or adjustable so that the plane of the base can be positioned parallel to the axis of the tubular support member and parallel to the plane of the desk's back. Numerous means have been provided to accomplish this result and, as mentioned above, such means include collapsible tripod-type legs. However, in the case of plate-type bases, as that term is used in this application, the means known to the prior art are relatively complex making them expensive to manufacture or difficult to operate, and/or of questionable service life. One type of such means for plate-type bases involves threading the bottom of the tubular support member and threading the base so the two parts can be assembled for use or disassembled for storage. Another type of such means for plate-type bases includes a trigger-type ratchet mechanism mounted to the base that is adapted to cooperate with teeth on the support post when it is assembled with the base.

Therefore, it has been one objective of this invention to provide a quick release lock which permits a tubular member to be positively engaged with a plate member when the plate member is disposed substantially perpendicular to the tubular member.

It has been another objective of this invention to provide a quick release lock that positively relates a tubular member to a plate member, the members being disposed substantially perpendicular to one another, wherein the connection so formed prevents wobbling, wiggling, tipping, slipping, and other undesirable problems which are normally associated with the releasable connection of a tubular member to a plate member.

It has been still another objective of this invention to provide a music stand incorporating the quick release lock of this invention.

These objectives have been attained by providing a quick release lock comprising, in preferred form, (a) a circular hole in the plate member in which the tubular member is received, the hole being sized to provide slip fit when the plate member and tubular member are assembled and the hole having a first center that establishes a center axis perpendicular to the plate member, (b) at least two pins mounted to the plate on opposite sides of the hole, the pins being disposed on a circle having a second center with that second center being offset a small distance relative to the first center, (c) a lockring rotatable relative to the plate member having a pair of opposed arcuate slots engaged with the pins, the arcuate slots having a common third center which lies on the same center axis as the second center, and (d) a hole in the lockring that establishes a fourth center, the fourth center being offset the same small distance relative to the third center as the second center is offset from the first center so that as the lockring is rotated relative to the plate member the fourth center can move from a release position where the fourth center also lies on the same center axis as the first center to a lock position where the fourth center is offset relative to the center axis of the first center.

Other objectives and advantages of the invention will be more apparent from the following detailed description taken in conjunction with the drawings in which:

FIG. 1 is a perspective view illustrating the quick release lock of this invention in conjunction with a music stand;

FIG. 2 is a cross-sectional view taken along lines 2--2 of FIG. 1 illustrating the lock in the unlocked position;

FIG. 3 is a view similar to FIG. 2 illustrating the lock in the locked position;

FIG. 4 is a cross-sectional view taken along lines 4--4 of FIG. 3; and

FIG. 5 is an enlarged view of the lock with the relation of the lockring relative to the baseplate and tubular member overemphasized for illustrative purposes.

As is more particularly illustrated in FIG. 1, the quick release lock 10 of this invention has been found to be particularly useful in conjunction with a music stand 11. The usual music stand 11 includes a music desk 12 having a back 13 and a lip 14 disposed at the lower end thereof. The desk's back 13 is provided with angulated reinforcers 15 that cooperate to define a channel 16 within which the top 17 of a tubular support 18 is pivotally mounted by pivot pin 19. The tubular support 18 includes a top half 20 telescopingly received in a bottom half 21, the two halves being held at the desired height by thumbscrew 22. The tubular support 18 is retained in fixed engagement with the stand's base or plate member 23 by the quick release lock 10. The stand's base or plate member is illustrated as one having three feet 24 and being substantially perpendicular to the axis of the tubular member 21.

The quick release lock 10 is particularly illustrated in FIGS. 2-5 with FIG. 2 illustrating the lock in the open or unlocked position whereat the tubular member 21 may be engaged with or disengaged from the plate member 23 by a simple sliding motion exercised by hand, that is a slip fit. FIG. 3 illustrates the lock 10 in the locking position whereat the tubular member 21 is positively engaged with the plate member 23 and cannot be removed therefrom.

As illustrated in FIGS. 2 and 4, the quick release lock 10 intimately involves the plate member 23 which, in the case of the music stand 11, includes the three feet 24 emanating from the center of the base. The plate member 23 includes a raised central or steppelike portion 31 that is formed out of and is integral with the general plane of the plate member. The steppe 31 is supported above the plate member 23 by sloping sidewalls 32. A lockring 33 rests on, that is, is supported on, the steppe 31 and is movable relative to both the plate member 23 and the tubular member 21. The lockring 33 provides finger tabs 34 on opposite sides thereof which extend out over the wall 32. Thus, the steppe 31 of the baseplate 31 in combination with the tabs 34 on the lockring 33 permits the lockring to be easily rotated when grasped by a person's fingers when it is desired to move the lockring from the release position to the lock position and vice versa.

The baseplate 23 provides a circular hole 35 into which the tubular member 21 is received. The circular hole 35 is of a diameter just a little greater than the diameter of the tubular member 21, for example, on the order of one thirty-second inch, so that an easy slip fit is available between the tubular member 21 and the plate member 23 when the two are either being assembled or disassembled. Also, the first center 36 established by the hole 35 gives rise to a center axis 42 perpendicular to the plate member 23.

Two pins or leaders 37 are positively and immobily mounted to the plate member 23, as at 46, on opposite sides of the plate's hole 35, the pins being disposed on the circumference of and on the same diameter 38 of circle 39 which presents a second center 40. The leaders or pins 37 are mounted so that the second center 40 is offset a small distance from the axis 42 and the first center 36. The pins 37, because they are in the form of rivets in this embodiment, also function to hold the lockring 33 in operating engagement with the plate member 23 by means of heads 44 extending over the sides of tracks or arcuate slots 45 provided in the lockring.

The lockring 33, as noted, is provided with two tracks or arcuate slots 45 positioned on the same circle 39 and located on opposed sides of that circle's center 40. The width of the tracks or slots 45 is preferably just slightly greater than the diameter of the leaders or pins 37 so the lockring 33 can be easily rotated about and guided by the pins within the slots. The arcuate slots 45 have a common third center point 48 which, when the lockring 33 is positively engaged with the plate member 23 by means of the pins 37, lies on the same axis as the second center 40. Thus, no matter what the point in rotation of the lockring 33 relative to the baseplate 23, as guided by and permitted by the length of the arcuate slots 45 cooperating with the pins 37, the center 48 of the arcuate slots always remains on the axis of center 40.

A hole 49 is also provided in the lockring 33, that hole establishing a fourth center 50. The lockring hole 49 is preferably of the same diameter as the baseplate hole 35, that is, just a little greater than the diameter of the tubular member such as on the order of one thirty-second inch, so that an easy slip fit is also available between the tubular member 21 and the lockring 33 when the tubular member is being assembled with or disassembled from the plate member 23. A collar 55 is provided around the lockring hole 49 and integral with the lockring 33 for reinforcing purposes. Also, the collar 55 aids in preventing the lockring 33 from damaging the tubular member 21 when the quick release lock is repeatedly moved to the locking position. However, and most importantly, the center 50 of the lockring hole 49 is slightly offset relative to the third center 48 by approximately the same distance as the center 36 and 40 are offset so that as the lockring 33 is rotated relative to the plate member 23 the fourth center can move from a tubular member 21 release position, see FIG. 2, whereat the fourth center 50 also lies on the center axis 42, to the lock position of FIGS. 3 and 4, whereat the vertical axis 52 on which the fourth center 50 lies is offset relative to the stationary center axis 42 on which the first center 36 always lies.

As is particularly illustrated in FIG. 4, when a music stand 11 is involved it is preferred that a tubular socket cup 56 be interconnected with the steppe 31 by means of the pins 37 on the side thereof opposite to that side on which the lockring 33 rests. The inside diameter of the cup 56 is equal to the diameter of the lockring hole 49 and the plate member hole 35, and the axis of the cup is superimposed on the center axis 42. Thus, the tubular member 21 of the music stand 11 can be easily received with and supported by the plate member 23 so that the tubular member is substantially perpendicular to the plate member when the plate member hole 35 and the lockring hole 49 are superimposed exactly, as illustrated in FIG. 2.

In operation, and as is particularly illustrated in FIG. 5 in combination with FIGS. 2-4, as the lockring 33 is rotated and guided from its furthermost counterclockwise position determined by arcuate slots 45 (see FIG. 2), which is the release position, to an intermediate position where the pins 37 are intermediate the length of the slots 45 which is the lock position (see FIG. 3) the center 50 of lockring hole 49 is moved relative to the center axis 42 of the plate member hole 35 so that the lockring forces the tubular member 21 received within the cup 56 (and, therefore, through the plate member hole 35) against the side of that hole 35 and side of that cup. Thus, the lockring 33 positively grips, by use of frictional force, the tubular member 21 and the plate member 23 together. In the case of music stands, such a quick release lock has been found to provide good support and rigidity to the music desk.