US919673A - Ventilator for greenhouses. - Google Patents

Description

G. B. AKDEESGH.

TEATOB. BOB GREENHOUSE.

A LIUATIOE FILED IEB.1,1909.

919,673. Patented Apr. 27, 1909.

2 SHEETS-SHEET 1.

I/ v v 5 s1 mces e 21; Z a zg janczierso r/ G. B. ANDERSON. VENTILATCR FOR GREENHOUSES.

APPLICATION FILED I'EB.1,1909.

Patented Apr. 27, 1909.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE. GEORGE B. A NDERSO'N, OF HYDE PARK,- MASSACHUSETTS, ASSIGNOR TO JAMES M. i

FARQUHAR, OF BOSTON, MASSACHUSETTS.

VENTILATOR FOR GREENHOUSES.

Specification of Letters Patent.

Patented April27, 1909.

Application filed February 1, 1909. Serial No. 476,323;

To all whom it may concern:

Be it known that I, GEORGE B. ANDERSON,

a citizen of the United States, residing at like parts.

This invention relates to ventilators for greenhouses, and has for one of its objects to provide a novel mechanism by which the swinging sashes on each side of the greenhouse roof may be 0 erated either simultaneously or inde en ently from a single shaft, and for anot er of its objects to provide a novel construction whereby the sashes may belocked in their open or closed position.

One embodiment of my invention will first be described and then the novel features will be ointed out in the appended claims.

'eferring to the drawings wherein I have illustrated said embodiment of my invention, Figure 1 is a vertical section through a greenhouse showing my improved ventilating device; Fig. 2 is a section on the line xr, Fig. 1; Fig. 3 is a side view of the ventilating apparatus, Fig. 4 is a section on the line g 'y,

in the drawings 3 represents the roof of the greenhouse and 4, 4 re resent the swinging sashes with which gree houses'are usuaily equipped. "These swinging sashes are common y hinged to the peak of the roof, as at 5, and are adapted to swing upwardly away from the rafters for ventilation purposes, as shown at the right hand in Fig. 1, or are adapted to be swung down into contact with the rafters for closing the ventilating -open ings, as shown at the left hand in Fig. 1. Each sash is shown as having pivoted thereto a link 6 which is pivoted to an arm 7 that is fast on a shaft 9 that runs longitudinally of the roof and is journaled in suitable bearings 90. Each shaft has thereon a segmental worm gear (said gears being designated 8 and '8) which is adapted to mesh with and be driven by a worm 11 carried by a vertical shaft 12 that is 0 erated from a handle 13 through suitable evel gears 91, 92, and is journaled in suitable bearings 38. The turning of the handle 13 operates to turn the shaft 9 thereby to raise or lower the swinging sash connected therewith; lhis construction is such as is commonly provided in eenhouses. Heretofore, however, it has een customary to provide. an operating mechanism such as above described for eac of the swinging sashes, so that one handle 13 and its corresponding vertical shaft 12 is used for raising or lowerin the sash on one side of the ridge ole or pea of the roof, and another similar if used for raising or lowering the sash on the other side of said peak. One of the objects of my invention isto provide a novel construction whereby both of the sashes can be. operated from the same vertical shaft and may be operated either simultaneously or separately as desired. I acoom lish this end y placing the shaft 12, centra 1y between the two worm gears'S and 8 and arranging the worm 11 so that it is adapted to mes 'with both of. said worm gears. Where this construction is ado ted the rotation'of the shaft 12 will rotate 0th worm gears, and, therefore, the two sashes 4' and 4 may be operated simultaneously. 0

It is often necessary, however, to raise one sash without raising the other or to otherwise operate the sashes independentl from each other. My invention contemplhtes a construction by which this may be done, and 5' in the present embodiment I accomplish it by arrangin the ears 8 and 8' so that they may at wil be isconnected from orconnected to the worm 11. This end is secured by splining the worm, gears 8 and 8 to the shafts 9 so that said gears may be moved longitudinally of the shafts thereby to carry the teeth thereof into or out'of mesh from the worm 11.

In Fi s. 3 and 4, the worm gear 8 is moved longitudinally so as to be disconnected from the worm 11 while the worm gear 8 is still in mesh with the worm. Where the parts are in these positions, operation of the handle 13 will raise or: lower the sash 4 but will give 10o no movement to the sash 4. (in the other hand, when the gear 8 is in mesh with the worm 11, but the gear 8 is thrown out of mesh therewith, then movement of the handle 13 will operate the sash 4. 8 and 8' may be shifted longitudinally in any suitable way. I have, however, shown for this purpose two levers 15 and 15 which are pivoted to brackets or arms 16 and are forked at their upper ends to engage in grooves 17 110 andle and vertical shaft is q The gears vented from rotation.

formed in the hubs 18 of the gears. I have also shown these. handles as extending.

through keepers 20 which are provided with notches 21 to lock the levers 15, 15 in either position desired. My invention also contemplates a construction whereby when either gear is disconnected from the worm it may be locked and pre- This lock is herein shown as comprising a pin or projection extending from the face of the gear-which is adapted to en age an abutment 31. When the gears 8 an 8 are shifted into a position to mesh with the worm 11, the stop pins or projections .30 are withdrawn from the abutments so as to permit the gears to freely turn. When the ears 8 and 8 are thrown 1 out of meshwith t e worm, the stop pins 30 v by arms constituting .of sai bracket having to engage-the top edge of an arm of the bracket. whenthe gear carrying the pin is disconnected'from the Worm 11. The con-' struction is also such that if the sash is partially raised, as shown at the right Fig. 1, and the corresponding gear is disconnected from the worm, the in 30 carried by said gear will engage the un erside of an arm of the bracket 60 and thus lock the sash open. It will be noted, however, that the locks are only operative when the gears are disconnected from the worm 7. When the gears are in mesh with the worm the pins 30 are withdrawn from the abutments.

The bracket 60 is shown as secured to a sleeve 61 which surrounds the shaft 12 and this sleeve 61 also constitutes the support to which the bearing 16 and keepers 20 are secured.

From'the above it will'beseen that .my

I construction permits the sashes 4,.4 to be as desired and also provides or 100 operated either simultaneousl or sepfilratialy g the sashes either in their open or closed positions.

. While I have illustrated herein one embodiment of my invention, I donot wish to be limited to the construction shown, as various changes in the shape and configuration of the parts maybe made without departing from the invention.

Having fully described my invention, What I claim as new and desire to secure by Letters Patent is 1Q In a ventilator for greenhouses, the combination with two swinging sashes, of a worm gear for o crating each sash, a worm common to I both gears, and an o erating shaft on which said worm is mountec 2. In a ventilator for greenhouses, the combination with two swinging sashes, of a wormgear for operating each sash, a worm common to both gears, a vertically-arranged shaft on which said worm is mounted, and

' means to disconnect either worm gear from said worm.

3. In a ventilator for greenhouses, the

combination with two swinging sashes, of a worm gear for operating each sash, a worm comgnon to both gears, a vertically-arranged shaft on which said worm is mounted, and means to disconnect either worm gear from said worm and lock said gear from movement.- I

4; In a ventilator for greenhouses, the

combination with two swingmg sashes, of a shaft extending longitudina ly of each sash, a worm gear on each shaft and connected to the. corres onding sash, a'vertically-arranged shaft, an a worm thereon adapted to mesh with and drive each of the worm gears, each worm gear being slidably mounted on .its shaft to permit it to be disconnected from the worm.

5. In a ventilator for greenhouses, the combination with'two swinging sashes, of a shaft extendinglongitudinally of each sash, a worm gear on each shaft and connected to the corresponding sash, a vertically-arranged shaft, a worm thereon adapted to mesh with and drive each of the worm gears, each worm gear being slidably mounted on its shaft to permit it to be disconnected from the worm,

and a lever forcontrolling the position of eachworm gear on its shaft.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnes ses.- GEORGE B. ANDERSON. I'Vitnesses:

LOUIS C, SMITH,. THOMAS J. DRUMMOND.

Images