US1580611A - Window lock - Google Patents

Window lock Download PDF

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Publication number
US1580611A
US1580611A US675818A US67581823A US1580611A US 1580611 A US1580611 A US 1580611A US 675818 A US675818 A US 675818A US 67581823 A US67581823 A US 67581823A US 1580611 A US1580611 A US 1580611A
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Prior art keywords
bolt
lock
window
end
key
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Expired - Lifetime
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US675818A
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Ernest C Kirkpatrick
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Ernest C Kirkpatrick
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    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05BLOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B65/00Locks or fastenings for special use
    • E05B65/08Locks or fastenings for special use for sliding wings
    • E05B65/0864Locks or fastenings for special use for sliding wings the bolts sliding perpendicular to the wings
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00Closure fasteners
    • Y10T292/08Bolts
    • Y10T292/0863Sliding and rotary
    • Y10T292/0867Spring projected
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00Closure fasteners
    • Y10T292/08Bolts
    • Y10T292/0863Sliding and rotary
    • Y10T292/0867Spring projected
    • Y10T292/0868Combined motion
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00Closure fasteners
    • Y10T292/08Bolts
    • Y10T292/096Sliding
    • Y10T292/0969Spring projected
    • Y10T292/097Operating means
    • Y10T292/0997Rigid
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00Closure fasteners
    • Y10T292/08Bolts
    • Y10T292/096Sliding
    • Y10T292/1014Operating means
    • Y10T292/1022Rigid
    • Y10T292/103Spring-arm catch
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00Closure fasteners
    • Y10T292/68Keepers
    • Y10T292/694Covers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00Locks
    • Y10T70/50Special application
    • Y10T70/5093For closures
    • Y10T70/5146Window
    • Y10T70/515Sliding sash
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00Locks
    • Y10T70/70Operating mechanism
    • Y10T70/7441Key
    • Y10T70/7486Single key
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00Locks
    • Y10T70/70Operating mechanism
    • Y10T70/7441Key
    • Y10T70/7486Single key
    • Y10T70/7492Tumblerless push or pull key
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00Locks
    • Y10T70/70Operating mechanism
    • Y10T70/7441Key
    • Y10T70/778Operating elements
    • Y10T70/7791Keys
    • Y10T70/7842Single shank or stem
    • Y10T70/7859Flat rigid
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00Locks
    • Y10T70/80Parts, attachments, accessories and adjuncts
    • Y10T70/8432For key-operated mechanism
    • Y10T70/8459Housings
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00Locks
    • Y10T70/80Parts, attachments, accessories and adjuncts
    • Y10T70/8432For key-operated mechanism
    • Y10T70/8459Housings
    • Y10T70/8486Cylindrical
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00Locks
    • Y10T70/80Parts, attachments, accessories and adjuncts
    • Y10T70/8432For key-operated mechanism
    • Y10T70/8649Keyhole covers

Description

April 13, 1926. 1,580,611

` E. C. KIRKPATRICK WINDOW LOCK Filed Nov. l20, 1923 2 sheets-sheet 1 l Waff Aw/Mmm caf/iw April 13 1926 1,580,611

E. C. KIRKPATRICK WINDOW LOCK Filed Nov. 20l 1923 2 Sheets-Sheet 2 Patented Apr. 11?, 1926. i

UNITED STAT-ES 1,580,611 PATENT OFFICE.

ERNEST c. KIRKPATRICK, oF SEATTLE, WASHINGTON. v

WINDOW Loox.

Applieauon inea November 20,1923.i serial No. 675,818.

specification.

M invention relates to improvements in win ow sash locks and an olaject of my invention is to provide a window sash lock of strong and simple construction that is neat in appearance and that will operate eiliciently to loc-k a window sash either in a closed or an open position.

Another object is to provide a window sash lock that is easy to apply to a window sash and that wili make it possible to dispense with the catch-means ordinarily used for fastening the two sash of a window togather.

A further object is to provide a window sash lock that will automatically snap into a locked position when the window is opened or closed and i ide a lock that is operated hy a key f such other means as to render it imif ne to tai .per with the lock from the outside et the window.

A still further object is to provide a lock of neat and ornainentai appearance having a housing that may he made from a singieV Y piece of sheet metal stamped andY bent to the desired shape to form a tubular boit guide having a hase arranged to rest on the top o` a. window cash and an end plate arranged to fit against and he secured to the side of said window sash.

Other and more specic objects will loe apparent from the oiiowlng description taken in connection with the accompanying drawings. i

n the drawings Figure 1 is a .fragmentary view in perspective of a Window sash showing my invention installed thereon.

Fig. 2 i's a. plan view or a window sash lock constructed in accordance with my in-V vention showing a key in the lock.

Fig. A3 is a view in side elevation of the same. Y -Y Fig. 4 is a longitudinal sectional View of the same showing the bolt withdrawniand showin the fsocket into which the bolt is adapte to project.

Flg. 5 is a view in cross section on broken line 5-15 of Fig. 4. v 1

Fig. 6 isa detached view in Aperspective of in; litey that may be used in retracting the Fig. 7 is a fragmentary sectional ViewA showing one form of holt socket that may be used 1n connection with the' invention.

Fig. 8 1s a perspective view showing a diffrent form of bolt socket that may be use Y Fig. 9 is a view in side' elevation of 'a modiiied form of the invention.

Fig. 1G is a sectional view showing a lock having a modified form of bolt and key.

Fig. 11 is detached perspective view showing the holt and key used in. the lock in Fig. 1G.

Fig. 12 is 'aview in side elevation of a lock constructed in accordance with this invention having push button operating means on one side.

Fig. 13 is an enlarged cross sectional view suhstantiaily on broken line i3-13 ofV Fig. 12.

Fig. ia is view in iongitedinai section of another inodiiication of the invention in which the separaiie key is dispensed with.

Fig. 15 is a iongitudinal sectional view of a nin-dow lock having pushbutton type of operating means located in the end of the loc V Fig. 16 is a plan view showing the form ci blank from which the lock housing is made.

'Referring to the accompanying drawings, throughout which like reference numerals designate like parts I have shown in Figs. 1 to 8 inciusive a vWindow lock embodying' a housing preferably formed or" a single piece ofsheet metal, see Fig. 16, stamped to theV form shown and lient to provide a tubular guide member 1? having flange portions 18 that project sidewise and form a hase therefor, and having an end portion 19 arranged at right .angles to the ianges 18. The end portion 19 is preferably provided with notches 29 and the fiange portions 1S are provided with tongues 21 which t Within the notches 20 and are bent downwardly to fasten the end portion 19 and flanges 18 securely together. The circular portion 22 that orms the end of the tubular guide member 17, see Fig. 16, is crimped or bent as at 23 to aii'ord a more ornamental appearance and to form a. better guide through which a key may be inserted.

When constructed as above described the flanges 18'form a base adapted to rest upon the top rail 24 of a window sash while the yend member 19 is adapted to extend downwardly over the edge of said top rail c24. Screws 25 may be inserted through the anges 18 and end portion 19 to secure the lock frame to the window sash. .y

Slidably disposed within the tubular,y guide member 17 is a bolt 26 having a pin 27 arranged to operate within a longitudinal slot 28 in the guide fmember 17, the pin 27 serving to limit the movement of bolt 26 in both directions. The bolt 26 is urged outwardly by Aa compression spring 29 that abuts against the end22 of the housing and said bolt is provided on its inner end with a shank 30 of smaller diameter" having a cross pin 31 which may be engaged'by a tubular key 32 for the purpose of withdrawing or retracting the bolt 26, the key 32 being provided in its forward end with bayonet slots 33 for engagement with cross pin 31.

The side rail 34 of the upper window sash is provided with suitable sockets into which the end of the bolt 26 may project. The socket that registers with the bolt 26 when the window sash are in the closed position is preferably a short piece of metal tube 35, Figs. 4 and 8, that is inserted into al hole in the upper sash bar 34 so that when the sash are closed the bolt'26 snap into the tube 35 thereby securely locking the two sash together.

If desired a separate metal disc 36 may be inserted in the hole in the sash bar 34 before the tube 35 is placed therein to prevent tampering with the window lock by boring through from the outside, or the tube 35 may be provided with a solid end which obviates the need of the separate metal disc 36. v

For locking the window sash in an nopen position a socket of the form shown in Fig. 7 is preferably used, said socket comprising a tubular member 37 having on its forward end an annular flange 37 arranged to be secured to the sash bar 34 by screws 38. A disc 39 slidable within the tube 36 and urged outwardly by a relatively weak compression spring 40 is adapted to close the opening at the outer end of the tube 36 except when a bolt 26 is projected .into said tube 36. This type of socket being of orn/amental appearance is adapted to be used in places where it may be seen, the disc 39 closing the opening and serving to exclude dirt from the tube 36. One or more sockets of the form shown in Fig. 7 mayV be` used as desired to afford various adjustments permitting a window to be locked in various open positions.

When this device is locked it is practically impossible for a person on the outside of the window to tamper with and eiifect the release of the lock. The lock being key operated can only be unlocked by the use of a proper key and cannot be operated by the hand even though a person on the outside should ge able to reach the lock through the win- In Fig.A 9 I have shown a modified form of lWindow lock embodying a bolt housing 41 that is similar to the bolt housing previously described except that it is provided with a spiral slot 42 wherein a pin 43 on a bolt 44 is operatively disposed. Bolt 44 is urged outwardly by compression spring 45 and has squared shank 46 on its inner end that is arranged to fit within a square socket in the end of a key member 47. Bolt 44 may be retracted by inserting key 47 and turning same, pin 43 moving in spiralislot 42 when bolt 44 is turned and serving to retract or move said bolt rearwardly against the pres,-

sure of spring 45 and spring 45 serving to Y snap bolt 44 into a locked position as soon as key 47 is released.

Figs. 1() and 11 show a window lock similar to that shown in Figs. 1 to 8 inclusive except that a different form of key operating means is provided, said lock embodying bolt 48 having in its-(inner end a Adiametrically arranged slot 49 intersecting a transverse perforation 50 of larger dimensions than said slot. A Hat key 51 .having a nob 52 on one end is adapted to be inserted through the slot 49 and then turned to position the iliatnob52 substantially crosswise of the peroration 50 so that the bolt may be retracted by pulling on the key.

Figs. 12 and ,13 show another ,modified form of the inyention in which a lock housing 53 similar to the previously described lock housing is provided with a slot 54 having an enlargement 55 at one end. A bolt 56 slidable in housing 53 is provided with an indentation 57 wherein is disposed a push button 58 urged outwardly by a compression spring 59 and held by a screw 60. The push button 58 has an outer end portion 61, of smaller diameter, adapted to slide within slot 54,. the larger inner end portion 58 of said push button being of suitable size to it snugly within Athe enlarged end 55 of slot 54. A suitable spring, not shown, is used to urge bolt 56 outwardly as previously described. When the larger portion 58 of the push button is within the enlarged end 55 of the slot the bolt- 56 will be securely held in the locked position. The bolt 56 may be retracted by iirst pushing inwardly on the push button and then pulling the same toward the outer end of housing 53, the

smaller portion 61 of the push button moving in the slot 54.

Fig. 14 shows another alternative con` struction in which a bolt 62 is held in extended or locked position by a member 63 formed of a piece of spring metal bent substantially'double and provided with shoulders 64 arranged to lock against the end 65 of a bolt housing. The outer ends of the member 63 project through a slot 66 in the end 65 of the bolt housing and the inner end of the member 63 is secured to the bolt 62. A compression spring 67 urges the bolt 62 outwardly. The bolt 62 is retracted by pressing` the ends 68 of the member 63 together and pulling outwardly on the same. The spring 67 is strong enough to overcome frictional resistance of member 63 and snap bolt 62 back into a locked position after it has been retracted. Y

Fig. 15 shows another alternative con l struction in which a-push button 69 in the end of a lock housing 70 is used for retracting a tubular bolt member 71. The pusn button is connected with lazy tong links 72 which are mounted on a pivot 73 that is connected with housing 70 and are connected at their forward end by pivot 7 t with bolt lv71. A spring'75 extending around pivot 73 tends to urge lazy tong links 72 into an extended position and to project bolt 71 outurged `'outwardly by suitable springs and the means for retracting the bolt members being of various different forms. The sockets shown in- Fgs 7 and 8 are used in connection with all' forms of locks herein sh'own into the socket 36.

and described rit being .understood that the vspring 40 in the socket shown in Fig. 7 is weak enough so that it will be compressed by the. pressure of the sprin in the lock and permit the bolt to enter y and freely The device is strong and simple in construction, neat and ornamental in appearance, comparatively cheap to manufacture, easy to install on windows ofthe usual type and is especially eicient in operation said device making it possible to dispense with all other locks on the window and making it possible to lock the Window rmly and securely either` in a fully closed or partially open position with assurance that the lock cannot be tampered'with by persons on the outside of said window.

The foregoing description and accompany ing drawings clearly disclose what I now regard asV preferredl embodiments of my inventionl but 'it will be understood that numerous changes may be resorted to within the scope o'f the following claim.

I claim:

A window lock, embodying a tubular bolt guide arranged to be secured tothe top of a window sash, a bolt movable in said bolt guide, a. spring urging said bolt outwardly,

a spring member bent double and secured to the end of said bolt, said bolt guide having an opening in one end through which .the ends ofsaid spring member project and shoulders on said'spring member arranged to snap into locked engagement with the endof said bolt guide and to be released by pressure on the outer ends of said spring members.

ERNEST C. KIRKPATRICK.

US675818A 1923-11-20 1923-11-20 Window lock Expired - Lifetime US1580611A (en)

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558361A (en) * 1947-09-04 1951-06-26 Frank Klinger Locking mechanism of spring projected latching bolt type
US2694917A (en) * 1951-12-19 1954-11-23 Jr Earl M Trammell Locking plunger assembly for automobile door latches
US2991526A (en) * 1959-05-05 1961-07-11 James F Kuebler Scenery handling apparatus
US3136147A (en) * 1962-04-16 1964-06-09 Security Hardware Mfg Co Inc Window lock
US4068506A (en) * 1976-11-05 1978-01-17 Phelps Robert A Hidden lock
US4154071A (en) * 1977-02-22 1979-05-15 Castle Alfred B Auxiliary locking mechanism
USD270229S (en) 1980-10-22 1983-08-23 The Eastern Company Tool and operator head for tool-operated lock
USD270424S (en) 1980-10-22 1983-09-06 The Eastern Company Tool operator for tool-operated locks
US4590777A (en) * 1983-10-20 1986-05-27 Rafael Sierra Doorlock
US4621846A (en) * 1984-10-01 1986-11-11 Don Lefor Lock for sliding doors
US4790582A (en) * 1986-10-02 1988-12-13 Edward Keast Concealed window lock
US5125695A (en) * 1991-10-02 1992-06-30 Hartwell Max H Safety latch
US5157826A (en) * 1991-06-19 1992-10-27 P. L. Porter Company Method for making linear mechanical lock with one-piece lock housing
US5237843A (en) * 1991-10-04 1993-08-24 Merlin Gerin Device for retaining a keylock key
US8556307B1 (en) 2010-03-01 2013-10-15 John Michael Schaffhausen Adjustable single hung, double hung, sliding window, sliding glass door lock
WO2016009191A1 (en) * 2014-07-17 2016-01-21 Era Home Security Limited Sash window assembly
WO2017025654A1 (en) * 2015-08-07 2017-02-16 Borrás Avilés Alex Lock device for opening sliding windows

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558361A (en) * 1947-09-04 1951-06-26 Frank Klinger Locking mechanism of spring projected latching bolt type
US2694917A (en) * 1951-12-19 1954-11-23 Jr Earl M Trammell Locking plunger assembly for automobile door latches
US2991526A (en) * 1959-05-05 1961-07-11 James F Kuebler Scenery handling apparatus
US3136147A (en) * 1962-04-16 1964-06-09 Security Hardware Mfg Co Inc Window lock
US4068506A (en) * 1976-11-05 1978-01-17 Phelps Robert A Hidden lock
US4154071A (en) * 1977-02-22 1979-05-15 Castle Alfred B Auxiliary locking mechanism
USD270229S (en) 1980-10-22 1983-08-23 The Eastern Company Tool and operator head for tool-operated lock
USD270424S (en) 1980-10-22 1983-09-06 The Eastern Company Tool operator for tool-operated locks
US4590777A (en) * 1983-10-20 1986-05-27 Rafael Sierra Doorlock
US4621846A (en) * 1984-10-01 1986-11-11 Don Lefor Lock for sliding doors
US4790582A (en) * 1986-10-02 1988-12-13 Edward Keast Concealed window lock
US5157826A (en) * 1991-06-19 1992-10-27 P. L. Porter Company Method for making linear mechanical lock with one-piece lock housing
US5125695A (en) * 1991-10-02 1992-06-30 Hartwell Max H Safety latch
WO1993007349A1 (en) * 1991-10-02 1993-04-15 Hartwell Max H Safety latch
US5237843A (en) * 1991-10-04 1993-08-24 Merlin Gerin Device for retaining a keylock key
US8556307B1 (en) 2010-03-01 2013-10-15 John Michael Schaffhausen Adjustable single hung, double hung, sliding window, sliding glass door lock
WO2016009191A1 (en) * 2014-07-17 2016-01-21 Era Home Security Limited Sash window assembly
WO2017025654A1 (en) * 2015-08-07 2017-02-16 Borrás Avilés Alex Lock device for opening sliding windows

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